X-ray systems · PQ family

Philips PICKER PQ: troubleshooting and error codes

The ServiceForge knowledge base holds 301 documented symptoms for the Philips PICKER PQ, with 441 ranked causes, 767 diagnostic checks with test points and expected values, and 103 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Unit does not tilt patient safety

Gantry tilt function not responding to operator commands at touch panel

Ranked causes

1. Tilt motor circuit breakers CB303 or CB302 off or tripped (common)
2. Loose or disconnected cable connectors (common)
3. Upper front gantry cover not closed (occasional)
4. Lift switches open or not reset (common)
5. Missing or incorrect DC power supply voltages (occasional)
6. 208 VAC supply missing or disconnected (occasional)
7. Right tilt motor no DC voltage (occasional)
8. Left tilt motor no DC voltage (occasional)

First check

Verify circuit breaker CB303 position

Test point: CB303 on AC Control chassis
Expected: ON

9 more checks with pass and fail actions, 8 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Missing or corrupted data in CT image acquisition

Data blocks missing from image; visible data patterns indicating detector or electronics failures; image quality degraded

Ranked causes

1. Analog switch malfunction in detector module (rare)
2. Single detector element failure (occasional)
3. Specific detector channel malfunction (occasional)
4. PSDC card failure or memory corruption (occasional)
5. Cable malfunction or poor connection between detector and PSDC (occasional)
6. VFSC card failure (rare)
7. Bad select cable causing multiple channel failures (occasional)

First check

Perform front end background check scan using diagscans

Test point: Diagnostic scan software
Expected: Scan completes without errors; compare output to baseline

5 more checks with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Gantry does not power on high voltage

Gantry power system non-responsive; LEDs on AC Control Panel not illuminated or circuit breakers tripped

Ranked causes

1. Gantry key switch not in NORMAL position (common)
2. Circuit breaker tripped or open (common)
3. Fuse failure (occasional)
4. E-STOP activated or disconnected (occasional)
5. Console and Patient Support interconnect cables disconnected (occasional)
6. AC Control Chassis fault (occasional)

First check

Verify required LEDs illuminated on AC Control Panel

Test point: AC Control Panel LEDs
Expected: CONTROL POWER, SYSTEM ENABLED, DC OK, DRIVES all ON

6 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No vertical motion high voltage

Vertical positioning controls do not produce vertical motion on gantry

Ranked causes

1. Vertical touch panel malfunction or disconnection (common)
2. TILT enable command not reaching CTCC (common)
3. TVENB enable signal failure (common)
4. Vertical potentiometer open circuit (occasional)
5. CTCC card failure (occasional)
6. GPUC (GPU card) failure (rare)

First check

Measure AC voltage on connector J415 pins 1-2, 1-3, 1-4 while pressing vertical controls

Test point: J415 pins 1-2, 1-3, 1-4
Expected: 120 VAC
Tools: DMM set to 300 VAC

7 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No vertical motion of patient support high voltage

Patient support does not move vertically; tilt control may also be affected

Ranked causes

1. Objects inhibiting vertical motion (common)
2. Tilt not at 0 degrees or support position too high/low (common)
3. Soft limit switch malfunction (occasional)
4. Connector or ribbon cable fault (occasional)
5. CTCC (gantry control card) failure (occasional)
6. Loss of 208 VAC power to vertical motor (occasional)

First check

Inspect for obstructions around patient support

Test point: Entire vertical motion path
Expected: No objects present

9 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Display not functioning or image not visible

Monitor shows no image or display is blank; keyboard and monitor connections may be affected

Ranked causes

1. Keyboard not plugged in or internal cable disconnected (common)
2. Contrast control incorrect setting (common)
3. Monitor power switch off (common)
4. Monitor fuse open or blown (occasional)
5. Power or signal cables disconnected (common)

First check

Keyboard connection status

Test point: Keyboard connector
Expected: Plugged in and internal cable connected

4 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Drive Off signal HIGH - main drive disabled caution

Drive Off signal remains HIGH, preventing K306 energization and disabling MAIN DRIVE ON function

Ranked causes

1. GPU microprocessor not functional (common)
2. Overspeed condition detected (occasional)
3. Scan position measurement fault (occasional)
4. Power up reset signal LOW (occasional)
5. Over temperature condition (occasional)

First check

Verify Drive Off signal state

Test point: B71, slot 19
Expected: LOW when normal operation intended

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Drive Off signal HIGH prevents main drive energization high voltage

K306 relay cannot be energized; MAIN DRIVE ON disabled due to Drive Off signal

Ranked causes

1. GPU Microprocessor not functional (rare)
2. Scan frame overspeed detected (occasional)
3. Scan Position Measurement Fault (occasional)
4. Power Up Reset signal LOW (rare)
5. Over Temperature condition (occasional)

First check

Locate and monitor Drive Off signal at B71, slot 19

Test point: B71, slot 19
Expected: LOW (signal inactive; drive enabled)

3 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Erratic horizontal motion patient safety

Table top movement is unpredictable or erratic along horizontal axis during positioning

Ranked causes

1. Mechanical belt or motor misalignment (common)
2. Faulty potentiometer or resolver (common)
3. Horizontal Power Amp output failure (occasional)
4. Horizontal Servo Motor failure (occasional)
5. Voltage regulation or signal integrity issue (occasional)

First check

Run diagnostics

Test point: System diagnostics
Expected: Diagnostics complete without errors

4 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No horizontal motion, local mode

Table or gantry will not move horizontally when using local mode touch panels; positioning system unresponsive

Ranked causes

1. Fuse F402 open (common)
2. Microswitch failure or misalignment (common)
3. Limit switch cable open or short (occasional)
4. Potentiometer failure or incorrect resistance (occasional)
5. Resolver-to-digital converter malfunction (occasional)

First check

Run cocal and codd diagnostics; verify fuse F402

Test point: Fuse F402
Expected: Good

6 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Vertical motion in one direction only patient safety

Support moves vertically in only one direction (up or down), not both

Ranked causes

1. Invalid VDRUP or VDRDN signal (common)
2. Faulty tilt panel (occasional)
3. Defective limit switch or cable (occasional)
4. Faulty relay K401 or K402 (rare)
5. Motor power issue or brake rubbing (common)

First check

Verify VDRUP signal validity

Test point: SSR403 logic
Expected: Valid logic level

6 more checks with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

999 error in error logger with Command Shell error high voltage

999 error appears in erl error logger; Command Shell error condition; scan frame may not respond to commands

Ranked causes

1. No communication to GALIL motion chip (common)
2. Bad GALIL chip (common)
3. Bad communication between GPUC and PMDC (occasional)
4. Bad DUART (occasional)

First check

Visually inspect scan frame and mechanical components

Test point: Scan frame assembly
Expected: No mechanical interference or damage

9 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Autovoice system not functioning

Speaker or intercom buttons (Local, Remote, Mute, Answer) not responding; associated LEDs not illuminating when buttons pressed

Ranked causes

1. Poor speaker connections (common)
2. Broken PCB to SYS MON/Autovoice cable #L7855 (occasional)
3. Broken PCB to Autovoice and Display cable #L7856 (occasional)
4. Autovoice PCB failure or LED circuit failure (rare)

First check

CPU diagnostics test

Test point: System diagnostics
Expected: Diagnostics completed successfully

5 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Scan drive offset and phase adjustment radiation

RDC offset and Motor Pole offset switches require adjustment to ensure X-ray beam alignment and smooth scan drive rotation without back EMF-induced stalling or backward rotation

Ranked causes

1. RDC offset switches incorrectly set (common)
2. Motor Pole offset switches incorrectly phased (common)
3. Resolver replaced or PMDC board replaced (occasional)
4. PMDC with resolver error correction circuitry installed (occasional)

First check

Power removal and access preparation

Test point: System wallbox and gantry covers
Expected: System powered off; gantry covers open; cardfile access cover open; DRIVES switch OFF; service keyswitch NORMAL; three motor drive fuses removed

1 more check with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Display shows 99.9 on Tilt and 1904 on Horiz display caution

Tilt display reads 99.9 and Horizontal display shows 1904 simultaneously

Ranked causes

1. No communication to GALIL motion chip (common)
2. Bad GALIL chip (occasional)
3. Bad communication between GPUC and PMDC (occasional)
4. Bad DUART chip (occasional)

First check

Check GALIL chip communication using oscilloscope

Test point: Communication signal lines
Expected: Stable communication signal present

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Incorrect display, vertical

Vertical display on patient positioning system is incorrect or not updating properly

Ranked causes

1. Vertical potentiometer (transducer) malfunction (common)
2. Cable BL7161 connection failure or open circuit (common)
3. CTCC (Control Card) failure (occasional)
4. GPUC (Graphics Processing Unit Card) failure (rare)

First check

Measure vertical potentiometer resistance

Test point: Connector P405 sockets 1 and 2
Expected: 500 ohms
Tools: DMM

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Laser power supply fault high voltage

Laser does not output 120 VAC or input power is incorrect

Ranked causes

1. No 120 VAC input at laser connector (common)
2. Laser Power Supply Assembly output failure (occasional)
3. Laser cable open or damaged (rare)
4. No +5 VDC at laser input (common)

First check

Measure 120 VAC at J2 input connector

Test point: J2 pins 5 (hot) and 1 (neutral)
Expected: 120 VAC
Tools: Multimeter

4 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No vertical motion on gantry high voltage

Gantry support does not move up, down, or tilt when vertical touch panel controls are pressed

Ranked causes

1. Relays K401 and K402 not seated properly in sockets (common)
2. No 208 VAC supply to vertical motor (common)
3. Invalid VDRUP or VDRDN signal (occasional)
4. No 208 VAC at motor terminals (occasional)

First check

Verify relay K401 and K402 seating

Test point: K401 and K402 sockets
Expected: Relays recessed snugly in sockets

4 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Vertical motion erratic high voltage

Support moves erratically up or down during patient positioning

Ranked causes

1. 208 VAC supply voltage absent or incorrect at motor (common)
3. 208 VAC supply voltage absent or incorrect at PSCC (common)
4. Relays K401 or K402 malfunction (occasional)
6. Bad limit switch cable or defective switch (occasional)

First check

Verify relay seating

Test point: K401 and K402
Expected: Relays recessed in their sockets

12 more checks with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

3 KVA transformer replacement high voltage

Procedure to remove and replace the 3 KVA transformer (80 pounds) in the gantry assembly

Ranked causes

1. Transformer requires replacement (unknown)
2. Remove transformer from gantry (unknown)
3. Install replacement transformer (unknown)

First check

Verify 230 VAC 3-phase power on L1, L2, L3

Test point: Terminal block on front of transformer
Expected: 230 vac 3-phase power present on l1, l2 and l3
Tools: DVM

6 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

512 error in error logger - GPU crash caution

System displays error code 512 in the error log (erl), indicating GPU processor failure or malfunction affecting scan drive operation

Ranked causes

2. Bad GALIL motion chip (occasional)
3. Bad DUART (occasional)
4. No communication to GALIL motion chip (occasional)

First check

Check error log for rotating frame errors or ANB on GPU

Test point: erl error logger
Expected: No 512 error code present

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Blower inoperative or running intermittently caution

Gantry cooling blower does not run continuously or fails to start; may cause thermal issues. Single blower failure or capacitor fault.

Ranked causes

1. Blower capacitor failed or capacitance out of range (common)
2. Fuse F315 or F317 open (occasional)
3. Blower motor winding or bearing failure (occasional)

First check

Verify fuse F315 (blowers) continuity

Test point: Fuse F315 on AC Control Chassis
Expected: Continuity (less than 1 ohm)
Tools: Ohmmeter or continuity tester

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Cardfile circuit boards require replacement high voltage

DC voltages (+5, +15, -15V) absent at backplane buss points; suspected cardfile or power supply failure

Ranked causes

1. Cardfile circuit board failure or damage (unknown)
2. Cardfile connection errors (common)
3. DC power supply malfunction (common)

First check

Measure DC voltages at cardfile backplane buss points

Test point: backplane buss points on top of cardfile
Expected: +5 V, +15 V, –15 V

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Collimator controls relay board +5V supply not operational high voltage

DS4 indicator does not light on drives interface board, indicating +5RS (SOURCE) is not available to relays and feedback circuits

Ranked causes

1. 120AUX AC power not reaching power supply (common)
2. Relay K3 PUP not latched or pulling in (occasional)
3. Regulated +5V output not reaching drives interface board (occasional)

First check

Verify 120MOM is on

Test point: 120MOM input
Expected: On state

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

DC Power Supply Fault/Sense board missing 120 VAC input high voltage

No 120 VAC detected at T1 pins 1–4 on DC Power Supply Fault/Sense board; prevents proper power supply sensing and fault detection

Ranked causes

1. Open in 120 VAC wiring to DC Power Supply board (occasional)
2. Failure of 8 kVA transformer or upstream AC power path (occasional)
3. Circuit breaker CB 304 open or faulty (occasional)

First check

Verify 8 kVA transformer output voltage

Test point: Output terminals of 8 kVA transformer
Expected: 114 VAC to 126 VAC line-to-neutral
Tools: Multimeter

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Gantry DC power supply voltages out of tolerance high voltage

DC voltages at Cardfile backplane bus points do not meet specification; +5V, +15V, or -15V supplies outside acceptable range or ripple excessive.

Ranked causes

1. Input 120 VAC not present at DC power supply terminals (common)
2. Shorts or excessive loading on DC supply outputs (common)
3. Circuit breaker CB 304 open or defective (occasional)

First check

Measure 120 VAC at DC power supply input terminals

Test point: Input terminals of each DC power supply
Expected: 120 VAC
Tools: DMM

4 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Hard drive test reports superblock corruption error

Running option 0 (Execute test) or option 5 (Magnetic media non-destructive write/read test) on newly formatted, virgin, or recently destructively tested disk produces superblock corruption error message

Ranked causes

1. Newly formatted or virgin disk without operating system (common)
2. Disk previously had destructive write/read test run (occasional)
3. Genuine defective media with actual corruption (rare)

First check

Run option 6 (Magnetic media destructive write/read test)

Test point: Hard drive diagnostic menu
Expected: Test completes without errors

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Laser button does not respond high voltage

Soft Bank 4 LED does not flash when pushing Laser button

Ranked causes

1. Faulty GPUC circuit card or signal lines (unknown)
2. GCPMI signal absent on PMDC card (unknown)
3. Drives Interface Board or XSC board failure (occasional)

First check

Measure EXTIRQ pulse on GPUC circuit card

Test point: U33 pin 13
Expected: Pulse present per schematic T61G-615
Tools: Oscilloscope

3 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No communication to GALIL motion chip

99.9 displayed on Tilt display and 1904 displayed on Horiz. display; GALIL motion control chip not responding.

Ranked causes

1. Bad GALIL chip (rare)
2. Bad DUART - communication interface fault (rare)
3. Communication failure between GPUC and PMDC (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

No horizontal motion in local mode high voltage

Carbon table top does not move horizontally when in local mode during patient positioning

Ranked causes

1. Resolver input signal absent or incorrect (common)
2. Potentiometer on CTCC out of adjustment (common)
3. Collision plate switch malfunction (occasional)

First check

Measure resolver input signal

Test point: Pin 19 or 20 at location 3-01 on the CTCC
Expected: 2 kHz sine wave at approximately 2 Vrms (5.65 V p-p) present and constant
Tools: Oscilloscope

4 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No output from laser radiation

Laser has no output or 'Check Printer' message displayed on LCDI board display unit.

Ranked causes

1. Connector pins bent or loose on LCDI board or back panel (common)
2. Back panel or camera cable connection issues (common)
3. LCDI board failure (occasional)

First check

Deenergize and inspect LCDI board connectors P3 and P4

Test point: P3 and P4 connectors on LCDI board
Expected: No bent pins, connectors fully seated

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Scan frame does not move high voltage

Scan frame cannot be rotated by hand or motorized movement fails; mechanical interference or drive system malfunction

Ranked causes

1. Mechanical interference in scan frame (common)
2. Main Drive relay K306 cannot be energized (occasional)
4. Bad DUART communication chip (rare)

First check

Inspect for mechanical interference

Test point: Scan frame rotation area
Expected: Free movement with no grinding or binding

7 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Superblock corruption error during hard drive diagnostic

Error message 'Test termination due to superblock corruption or attempting to run this test on the image disk' appears when running option 0 or 5 on newly formatted, virgin, or recently destructively tested disk

Ranked causes

1. Disk newly formatted or virgin (common)
2. Disk had destructive write/read test run on it (common)
3. Genuinely defective media (rare)

First check

Run magnetic media destructive write/read test

Test point: Hard drive diagnostic option 6
Expected: Test completes without errors

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tilt and horizontal displays show abnormal values

Tilt display shows '99.9' and horizontal display shows '1904' indicating motion control communication loss

Ranked causes

1. No communication to GALIL motion chip (occasional)
2. Bad GALIL chip in PMDC (rare)
3. Bad DUART in GPUC (rare)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tilt display shows 99.9 and Horiz display shows 1904 high voltage

Both displays show specific error values: 99.9 on tilt and 1904 on horizontal

Ranked causes

1. No communication to GALIL motion chip (common)
2. Bad GALIL chip (occasional)
3. Bad DUART communication device (occasional)

First check

Check error log for rotating frame errors or ANB on GPU

Test point: Error log
Expected: No rotating frame errors or ANB codes

5 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Tilt display shows 99.9 and horizontal display shows 1904 caution

Tilt display reads 99.9 and horizontal display reads 1904, indicating communication or sensor failure

Ranked causes

1. No communication to GALIL motion chip (common)
2. Bad GALIL chip (occasional)
3. Bad DUART (occasional)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unit has no vertical motion high voltage

Gantry support does not move up, down, or tilt when vertical touch panel controls are pressed

Ranked causes

1. Relays K401 and K402 not seated properly (common)
2. No 208 VAC at vertical motor (common)
3. VDRUP or VDRDN logic signals absent or invalid (common)

First check

Verify relays K401 and K402 seating

Test point: K401 and K402 sockets
Expected: Relays recessed in sockets snugly

6 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Carbon top horizontal position

Horizontal positioning of carbon top requires calibration after resolver replacement

Ranked causes

1. Resolver replacement (common)
2. Resolver connector disconnection (unknown)

First check

Verify resolver inserted into bracket opening

Test point: resolver bracket opening
Expected: resolver fully seated

6 more checks with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Center program execution radiation

Execute center program to calculate centering constants from centering rod and air scans for X-ray focal spot alignment

Ranked causes

1. Initial centering constant calculation required (common)
2. Global centering constant exceeds tolerance (occasional)

First check

Scan centering rod without metal pin

Test point: X-ray detector
Expected: Image processes without error

5 more checks with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Console Intercom/Speakerphone high voltage

System setup and verification of Intercom/Speakerphone panel operation on X-ray console

Ranked causes

1. Initial calibration required (unknown)
2. REMOTE button LED not illuminating (unknown)

First check

Power state: Gantry and Console

Test point: Power controls
Expected: Gantry power removed, Console OFF

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Gantry tilt A/D converter offset high voltage

Adjustment of tilt potentiometer output to 0.0 VDC at neutral position; part of gantry calibration procedure

Ranked causes

1. Tilt A/D converter requires offset calibration (common)
2. Limit switches require verification after calibration (common)

First check

Connect DMM to tilt A/D input

Test point: Pin 16 IC (location 16–09), TP3 on CTCC foil positive; TP1 on CTCC foil negative (ground)
Expected: DMM connected and ready for measurement
Tools: Digital multi-meter

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Gantry tilt limit switch high voltage

Tilt limit switch requires adjustment after replacement or maintenance

Ranked causes

1. Tilt limit switch replaced or requires adjustment (common)
2. Gantry covers removed during service (common)

First check

Apply gantry power

Test point: Gantry power supply
Expected: Power applied successfully

3 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Tilt switch verification and adjustment caution

Gantry tilt position display accuracy and limit switch operation; requires protractor measurement against scan frame and potentiometer adjustment on CTCC card to match display to physical position.

Ranked causes

1. Tilt switches require verification or adjustment after replacement (unknown)
2. Tilt switches require adjustment after replacement or repositioning (unknown)

First check

Display reading at –10 degree tilt position

Test point: Gantry touch panel display
Expected: –10 degrees, matches protractor measurement
Tools: Protractor

4 more checks with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Cardfile installation verification high voltage

Voltage and continuity checks after reinstalling cardfile assembly before returning to service

Ranked causes

1. Connection error at cardfile connector (occasional)
2. DC power supply malfunction (occasional)

First check

Check cardfile dc voltages at backplane buss points

Test point: backplane top buss points
Expected: +5, +15, –15 V
Tools: digital multimeter

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Console keyswitch OFF disconnects relay power supply high voltage

Rotating console keyswitch to OFF position or actuating E–Stop disconnects 120AUX from the +5 volt relay power supply

Ranked causes

1. Normal operation – keyswitch or E–Stop activated as intended (common)
2. System-generated power down signal active (occasional)

First check

Verify console keyswitch position

Test point: Console keyswitch
Expected: ON position

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Console keyswitch troubleshooting

Diagnostics for Console keyswitch and related power control circuits

Ranked causes

1. Keyswitch failure or J530 connector issue (occasional)
2. Pilot Control connection failure (occasional)

First check

Run SMB diagnostic

Test point: Diagnostic system
Expected: No keyswitch faults reported

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

DC Power Supply U1 voltages missing or out of specification high voltage

Voltages at U1 (Digital supply IC) pins 11, 12, 15, 4 are absent or outside tolerance; indicates power supply failure or internal short

Ranked causes

1. Internal failure of DC power supply or U1 IC (common)
2. Short circuit on digital supply outputs (occasional)

First check

Measure +5V (Digital) at U1 pin 11

Test point: U1 pin 11 on DC Power Supply Fault/Sense board
Expected: +5 VDC, +/- 0.25V
Tools: DMM

4 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Gantry DC supply voltages out of tolerance high voltage

DC voltages at Cardfile backplane bus points exceed specified ranges: +5V, +15V, or -15V outside tolerance bands or ripple exceeds limits

Ranked causes

1. Excessive loading on DC supply outputs (common)
2. Failure of Cardfile DC power supply (occasional)

First check

Verify 120 VAC at DC power supply input terminals

Test point: Input terminals of each DC power supply
Expected: 120 VAC present

4 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Gantry SSR control signal absent or stuck caution

Logic signal to Solid State Relay (SSR) not switching between +5VDC and 0VDC when Gantry power is applied; prevents SSR activation and power delivery to gantry

Ranked causes

1. AC Control Chassis control logic fault or component failure (occasional)
2. Disconnected or damaged signal cable from Console (occasional)

First check

Verify cable L7156 connection and continuity

Test point: Cable L7156 at P593 (Console) and J103 (Gantry)
Expected: Cable fully seated; continuity on all pins
Tools: Visual inspection; continuity tester

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Missing 120 VAC at DC power supply input high voltage

120 VAC not present at input terminals of DC power supply

Ranked causes

1. Fault in 120 VAC path through MK 301 and CB 304 (common)
2. Defective DC power supply (occasional)

First check

Verify 120 VAC present at DC power supply input terminals

Test point: DC power supply input
Expected: 120 VAC present
Tools: DMM

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

No tilt response from controls patient safety

Patient positioning tilt function does not respond when FWD or REV tilt switches are pressed; no movement on gantry

Ranked causes

1. Missing or incorrect enable command from CTCC to tilt motor driver (unknown)
2. Faulty Hall sensor in tilt motor feedback chain (unknown)

First check

Measure T-VENA enable line voltage at rest

Test point: TP304
Expected: +5 VDC
Tools: DMM

7 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Power brush block replacement high voltage

Removal and replacement of slip ring brush blocks for power and signal in X-ray gantry system

Ranked causes

1. Brush block maintenance or failure (unknown)
2. Reinstall brush block (unknown)

First check

Power isolated at wallbox

Test point: wallbox disconnect
Expected: gantry power OFF

3 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Power supply conversion for 220V-240V primary source high voltage

Systems requiring modifications to power supply and control unit stickers when 220V-240V is the primary power source and Q-Console or Voxel-Q 120 vac access is not available.

Ranked causes

1. Power supply configured for incorrect input voltage (common)
2. Fuse panel orientation incorrect (occasional)

First check

Verify fuses F4 and F5 are 1 amp type

Test point: Fuses F4 and F5 inside power input/power cord connection
Expected: LITTLEFUSE part # 312 001 or BUSSMAN AGC-1A

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Quick mechanical checks for scan frame issues caution

Initial visual and manual inspection of scan frame mechanics before detailed electrical diagnostics

Ranked causes

1. Mechanical interference in scan frame (common)
2. Gull-wing or collision switch malfunction (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

RDC converter failure or input signal loss

Resolver-to-digital converter (RDC) not producing valid 10-bit digital output; converter or input signal fault condition detected

Ranked causes

1. Fine RDC excitation lost or winding open (occasional)
2. Table position RDC failure (occasional)

First check

Verify 2.5 kHz reference signal present at fine RDC input

Test point: Fine RDC reference input
Expected: 2.5 kHz signal present and stable
Tools: Oscilloscope

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Resolver output signal loss or incorrect amplitude

Fine sine/cosine resolver outputs (fsin, fcos) or reference signal missing or out of specification at RDC input

Ranked causes

1. Primary excitation voltage out of specification (common)
2. Phase error between primary and secondary windings (occasional)

First check

Measure sine and cosine winding output amplitude

Test point: fsin, fcos outputs
Expected: 2 Vrms (max)

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Scan frame does not rotate smoothly or has loose cables caution

Operator detects resistance, grinding, or visible loose cables during scan frame rotation; potential clearance issues between rotating and stationary frame components.

Ranked causes

1. Loose cables connecting rotating and stationary frame (common)
2. Slip ring brush damage from incorrect rotation direction (occasional)

First check

Manually rotate scan frame and visually inspect cables for slack or improper routing

Test point: All rotating frame cable connections and stationary frame attachment points
Expected: Cables taut with no visible slack; frame rotates smoothly without resistance

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Scan frame does not rotate when commanded

Gantry fails to rotate when upper front cover is closed and interlock switch is in normal position

Ranked causes

1. Interlock switch failure preventing rotation (unknown)
2. Gantry mechanical obstruction or malfunction (unknown)

First check

Verify interlock switch returns to center position

Test point: Interlock switch
Expected: Switch centered after pull-check

1 more check with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Scan frame drive command signal abnormal caution

Oscilloscope monitoring of drive command voltage shows insufficient or unstable signal output

Ranked causes

1. Drives Off switch malfunction (occasional)
2. Servo controller fault (occasional)

First check

Measure drive command signal with oscilloscope

Test point: A26
Expected: Swinging voltage approximately +/- 10V when manually rotating scan frame, +/- 10V
Tools: oscilloscope

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Scan frame rotation inspection caution

Visual and mechanical inspection of scan frame rotation after repair work; check for loose cables and frame clearance

Ranked causes

1. Loose cables or obstructions from service work (common)
2. Cable interference during frame rotation (occasional)

First check

Visually inspect all scan frame cables for looseness

Test point: cable connections and routing
Expected: all cables secure with no visible slack or damage

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

More symptoms

Solid state relay or bridge rectifier replacement
VDRUP signal invalid or absent
Vertical transducer removal hazards
Zero interrupter signal not detected
Zero vane interrupter malfunction
24 VAC pilot power check
512 error in error log
8 kVA transformer input voltage out of tolerance
999 error in error log
Access gantry cover for servicing
Access gantry covers for servicing
Access to gantry components
Align patient positioning laser beams
Autovoice button LED not illuminating
Autovoice connection lost or unstable
Bridge rectifier replacement
Bus error test failed
Calibrate gantry tilt angle measurement
Calibration: 19" display monitor
Calibration: 19" display monitor adjustment
Calibration: 19" display monitor aspect ratio
Calibration: AC power supply voltages
Calibration: ACQPLAN option enabling
Calibration: AcQSim laser alignment to gantry isocenter
Calibration: AcQSim laser positioning initial setup
Calibration: AcQSim laser positioning verification
Calibration: AcQSim laser system verification
Calibration: Align ACQSIM side lasers
Calibration: Autovoice audio level adjustment
Calibration: Barker laser alignment
Calibration: Beam rotation angle
Calibration: brush block alignment
Calibration: Center calibration procedure
Calibration: Coarse zero position reference
Calibration: Cosine waveform amplitude
Calibration: Couch
Calibration: CTSIM offset configuration
Calibration: DC power supply voltages
Calibration: Enter lateral offset into AcQSim software
Calibration: EXACT Therapy Top installation and alignment
Calibration: Gantry and patient support verification
Calibration: Gantry tilt angle switches
Calibration: Gantry tilt angle verification
Calibration: Gantry tilt scale potentiometer (CTCC)
Calibration: Gantry X-ray field alignment
Calibration: Global Centering Constant
Calibration: Horizontal belt tension and position
Calibration: Horizontal position linear adjustment
Calibration: Horizontal position resolver feedback
Calibration: Horizontal position resolver feedback amplitude
Calibration: Horizontal resolver feedback signal adjustment
Calibration: Horizontal resolver feedback signal amplitude
Calibration: Horizontal sine input amplitude
Calibration: Horizontal sine input verification
Calibration: Horizontal sine input voltage
Calibration: Large focal spot centering
Calibration: Laser alignment verification
Calibration: Laser assembly mounting
Calibration: Lateral laser offset
Calibration: Lateral laser offset correction
Calibration: Lateral tube alignment
Calibration: Main Drive
Calibration: Main drive excitation level
Calibration: Mark X and Z axis center of scan plane
Calibration: Motor pole offset adjustment
Calibration: Patient support cover installation
Calibration: Patient support cover mounting
Calibration: Patient Support Cover removal and replacement
Calibration: Patient support cover removal/replacement
Calibration: Patient Support vertical and horizontal positioning
Calibration: Power supply 12 VDC reconfiguration
Calibration: Resolver error correction circuitry
Calibration: Rotating frame lateral alignment
Calibration: Scan drive adjustment
Calibration: scan drive using MADCAP
Calibration: Scan frame rotation and laser alignment
Calibration: Signal brush block alignment
Calibration: Telescoping base cover removal and reinstallation
Calibration: Telescoping base cover top section removal
Calibration: Tighten Patient Support bolts
Calibration: Tilt potentiometer and limit switches
Calibration: Tilt switches verification and adjustment
Calibration: Ultra Q floppy disk drive installation
Calibration: vertical transducer
Calibration: X-ray field alignment
Calibration: X-ray tube axial alignment
Calibration: X-ray tube axial mechanical alignment
Calibration: X-ray tube lateral alignment
Cannot control gantry from operator console during service
Card cage in extended position during gantry tilt
Card cage retraction requirement
Ceiling-mounted LTU may interfere with injector arms
Collision plate not functioning
Collision plate not responding
Collision Pleate activation check
Cone gasket deterioration or uneven compression
Configuration: AcQSim network and system settings
Counter test failed
Dangerous voltage exposure with covers removed
Dangerous voltages exposed during gantry cover removal
Dangerous voltages exposed with gantry covers removed
DC voltages out of tolerance on Cardfile backplane
Disk format timeout
Drive Command signal absent or incorrect
Drive verification using ring diagnostic
DUART operation test
DUART timer and interrupt test
During removal/replacement operations on telescoping base covers
Electrical hazard from exposed voltages
Electrostatic damage to PCB components
Equipment covers open safety risk
Error code 512 in error log
Error code 999 in error log
Excessive DC supply output loading or shorts
Exit madcap program
Film and reference marker placement for calibration
Final laser alignment verification
Floppy drive not recognized after motherboard replacement
Fluid leak into detector electronics
Gantry 480 VAC 3-phase input voltage out of range
Gantry cover and panel safety
Gantry cover removal and securing
Gantry covers exposed high voltage
Gantry covers removed exposing dangerous voltages
Gantry covers removed operation
Gantry does not power down
Gantry laser covers need securing before calibration
Gantry lasers misaligned
Gantry LOCAL START procedure
Gantry operation verification after component replacement
Gantry power and warm-up setup
Gantry power application
Gantry tilt limit switch replacement
Gantry tilt switch replacement/adjustment procedure
Gantry tilting motion verification
Ground potential shift at AC Control Chassis
Gull-wing, collision or drives switch malfunction
High voltage exposure hazard during cover removal
Horizontal drive motor replacement - vibration after installation
Injury from sharp upper gull wing panels
Injury risk when lifting LTU during installation
Installation: Mount lateral laser assembly on column
Intercom/Speakerphone panel LED not illuminating
Intercom/Speakerphone REMOTE LED not illuminating
Interlock switch does not prevent frame rotation
Interlock switch does not prevent gantry rotation
Interlock switch not preventing frame rotation
Interlock switch not preventing scan frame rotation
Laser beam adjustment interaction
Laser beam alignment check
Laser beam focus adjustment
Laser beam misaligned or not operational
Laser radiation and rotating machinery injury hazard
Laser radiation hazard during positioning
Limit switch replacement procedure
Loose connector P402 at J402
LTU mounting interference with injector arm or gull wing
LTU mounting interferes with injector arm or gull wing
Memory test failed above address 0x20000
Memory test failed below address 0x20000
Missing or low 480 VAC 3-phase at transformer input
Monitor cannot achieve correct aspect ratio
Monitor cannot achieve specified aspect ratio
Monitor cannot be adjusted to specified aspect ratio
MPC test failed
Negative limit switch does not interrupt tilting motion
Obstruction in X-ray beam path
Opening gantry covers for scan drive control service
Optical disk diagnostic fails due to unwritten media
Over-temperature shutdown activated
Patient support cover removal
Patient support cover removal and replacement
Patient support covers removal and replacement
Patient support covers removal/replacement
Patient support covers require removal and replacement
Patient Support not centered in scan field
Patient Support not perpendicular to gantry
Patient Support not tracking properly during vertical travel
Personnel injury from lifting sagittal laser
Power-up reset signal abnormal
Reconfigure 24 VDC power supply
Remove and replace patient support covers
Replace 3 KVA scan drive transformer
Replace 3KVA scan drive transformer
Replace bridge rectifier
Replace bridge rectifier on scan drive control
Replace gantry limit switch
Replace limit switch assembly
Replace limit switch on patient support
Replace power brush block
Replace solid state relay (SSR)
Replace solid state relay on scan drive control
Replace vertical limit switch
Resolver replacement
Rotating frame errors or ANB indication present
Rotating frame hazard during operation
Rotating frame inspection and rotation
Rotating machinery hazard during operation
S-Bus board pins damaged during installation
Safety: High voltage and heavy equipment handling
Sagittal laser position deviation
Sagittal laser readout displays incorrect positive/negative numbers
Scan drive overspeed condition
Scan drive position error
Scan frame does not begin CCW rotation after stop
Scan frame does not decelerate to stop at zero position
Scan frame home position rotation
Scan frame motor initialization required
Scan frame position not established at power-up
Scan frame rotates with gantry cover open
Scan frame rotates with upper front cover open
Scan frame rotation causes slip ring brush damage
Scan frame rotation hazard
Scan frame will not move or has mechanical interference
Scan position measurement fault condition
Scissor-action mechanism hazard with support base covers removed
Sharp edges on gantry covers hazard
Signal brush block removal and replacement
Solid state relay replacement
Static electricity damage to circuit boards
System does not operate with front covers open
System verification after cardfile replacement
Telescoping base cover replacement
Telescoping base covers removal and replacement
Transducer wire damage during connection/disconnection
Transducer wire snap hazard during connection
Transformer replacement procedure
Two service persons required for cover procedures
Unexpected exception
Unexpected exception sitting in pROBE
Unit does not start after power on
VDRDN signal invalid or absent
Vertical limit switch diagnostic check
Vertical touch panel malfunction
Vertical transducer operation verification
Vertical transducer replacement and calibration
Visual test execution on display board
Work on gantry with upper panels open
Work on X-ray gantry with covers removed
X-ray tube axial mechanical alignment
Zero interrupter not triggering

241 more symptoms with ranked causes and checks are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`0`	Did not boot; never made to beginning of code	Constant ACFAIL from RCB/DIB; bad software or hardware failure	critical
`1`	Failed RAM Address write test	Failure during RAM address write test	critical
`11`	DSP memory test failure	Acquisition time-out error or memory corruption during DSP diagnostics	error
`13`	Zero Reference ADCA Test failure	DSP power-up diagnostics detect zero reference error in analog-to-digital converter A	error
`14`	Positive 15 V rail test failure	DSP diagnostics detect positive 15 V supply out of specification	error
`14`	Unexpected PITR interrupt during testing	Unexpected PITR interrupt detected during diagnostic testing	error
`15`	Interrupt mask error	SR mask does not match expected mask value during interrupt testing	error
`15`	Negative 15 V rail test failure	DSP diagnostics detect negative 15 V supply out of specification	error
`16`	ADCB Reference Test failure	DSP power-up diagnostics detect reference error in analog-to-digital converter B	error
`16`	SCI TE Interrupt Timeout	Serial communication interface transmit enable interrupt failed to occur	error
`17`	5 V rail test failure	DSP diagnostics detect 5 V supply out of specification	error
`17`	SCI TC Interrupt Timeout	Serial communication interface transmit complete interrupt failed to occur	error
`18`	SCI RDFRF Interrupt Timeout	Serial communication interface receive data register full interrupt failed to occur	error
`18`	ADCA Reference Test failure	DSP power-up diagnostics detect reference error in analog-to-digital converter A	error
`19`	Starter 10 V Reference Test failure	DSP diagnostics detect 10 V starter reference out of specification	error
`19`	SCI Mask Error	SCI interrupt mask does not match expected configuration	error
`1900`	Cannot setup ANB Driver	ANB Driver initialization fails during startup	critical
`1903`	Cannot initialize Frame Galil	Frame Galil motor controller fails to initialize	critical
`1904`	Cannot initialize Couch Galil	Couch Galil motor controller fails to initialize	critical
`1908`	Cannot start GPU Manager Process	GPU Manager process fails to start during boot	critical
`2`	Failed RAM 5555hex test	Bad bit detected during RAM 5555hex pattern test	critical
`20`	Temperature Test failure	DSP diagnostics detect out-of-range temperature sensor output	error
`20`	Soft Watchdog Error	Software watchdog timer detected error condition	error
`21`	Filament DAC Zero Output Test failure	Filament digital-to-analog converter does not output zero when commanded	error
`21`	Watchdog Intermit Error	Watchdog interrupt error during diagnostic test	error
`22`	Soft Watchdog Error Reset	Software watchdog triggered error and system reset	error
`22`	Filament DAC Full Scale Output Test failure	Filament DAC does not output full-scale voltage when commanded	error
`222`	Spurious Interrupt Error	Fatal error in gantry control system before GPMN process starts or within error process itself	critical
`23`	ROM Check Sum Error	ROM memory checksum verification failed during power-up diagnostics	critical
`23`	Filament DAC Linearity Test failure	Filament DAC output does not scale linearly with input commands	error
`24`	RSR Error	RSR (register) error detected during diagnostic test	error
`24`	MADAC Zero Output Test failure	MA (tube current) DAC does not output zero when commanded	error
`25`	Soft Watchdog Timeout Error	Software watchdog timer exceeded timeout threshold	error
`25`	MA DAC Full Scale Output Test failure	MA DAC does not output full-scale voltage when commanded	error
`26`	MADAC Linearity Test failure	MA DAC output does not scale linearly with input commands	error
`27`	KV DAC Zero Output Test failure	High voltage (kV) DAC does not output zero when commanded	error
`28`	KV DAC Full Scale Output Test failure	KV DAC does not output full-scale voltage when commanded	error
`29`	KV DAC Linearity Test failure	KV DAC output does not scale linearly with input commands	error
`3`	Failed RAM AAAAhex test	Bad RAM detected during AAAAhex pattern test	critical
`30`	Unexpected Exception	Unexpected exception condition detected during diagnostics	error
`333`	Watchdog Timer Timeout Error	Fatal error when watchdog timer expires in gantry control system before GPMN process starts or within error process itself	critical
`4`	Failed NOV RAM test	Failure during NOV RAM diagnostic test	critical
`444`	System exception error	Exception error detected during XSC power diagnostics	error
`5`	Failed ROM test	Failure during ROM integrity check	critical
`512`	GPU Crash in error logger	GPU microprocessor failure or overspeed condition during scan operation	critical
`512`	GPU crash - graphics processing unit or motion control processor failure	GPU microprocessor malfunction, bad GALIL motion chip, bad DUART, or communication loss to motion chip	critical
`555`	Bus address error	Bus address error detected during XSC power diagnostics	error
`6`	Failed CPUFAIL interrupt level 7 test	Constant ACFAIL from RCB/DIB; CPU interrupt level 7 failure	critical
`7`	Failed interrupt level 6 test	Fault circuitry failure detected during interrupt level 6 test	error
`8`	Failed timer Z48 test	Failure during timer Z48 diagnostic test	error
`9`	Failed sync test	Sync test failure during diagnostics	warning
`999`	Command Shell error - system command interpreter or communication failure	Command shell communication loss or command processing failure	error
`999`	Command Shell error in error logger	Loss of communication or command processing failure in scan drive control system	error
`A`	Failed interrupt level 3 test	Interrupt level 3 failure during diagnostic test	error
`ACQSim functions not active`	ACQSim software features are not enabled in the Voxel-Q system	ACQSim functions not activated after software installation	error
`B`	Failed interrupt level 2 test	Interrupt level 2 failure during diagnostic test	error
`C`	Failed interrupt level 1 test	Interrupt level 1 failure during diagnostic test	error
`can't identify plot on display`	System unable to recognize or validate plot data on display output	Plot validation check after rendering	error
`can't start acceldma on heurikon`	Unable to initiate acceldma process on Heurikon hardware	Scan start command issued	error
`can't start plot on display`	Unable to initiate plot rendering on display module	Display update command	warning
`D`	Failed DUART serial test	Serial port DUART chip test failure	error
`datpos`	Drives at position	Scan frame and table have reached commanded positions	info
`dits counter not reset to 0 error`	DITS counter failed to reset to zero at initialization	System startup or scan preparation sequence	warning
`divide by 0 error, plot file not updated`	Mathematical division by zero encountered; plot file not written as a result	Plot calculation or normalization	error
`drvflt`	Drives fault - directly shuts down hardware	Various drive-related faults detected	critical
`E`	Failed bus address error test	Bus address error detection failure	error
`Error logged when power switch turned OFF with tube heat abo`	Gantry shut down immediately due to unsafe shutdown procedure	Console power switch turned OFF when tube heat above 35%	warning
`error reading scan data`	Scan data file could not be read or accessed	Data retrieval after scan completion	error
`F`	Wouldn't boot to applications side	Failure to boot to applications side of system	critical
`fatal error message`	Unrecoverable system error encountered	Critical software or hardware fault during operation	critical
`hdperr`	Horizontal drive position error	Table actual position differs from commanded reference	error
`hdract`	Horizontal drive active - status signal indicating proper operation	Horizontal drive is functioning normally	info
`hpmflt`	Horizontal position measurement fault	Table position RDC input signal lost or RDC failure	critical
`illegal signal`	Received signal does not conform to expected format or protocol	Signal reception and validation	warning
`lread error of bad.dat`	Failed to read bad.dat file	Loading bad data records	error
`lwrite error bad.dat`	Failed to write bad data records to bad.dat file	Recording out-of-range or invalid data points	error
`lwrite error to raw data file`	Failed to write scan data to raw data file	Saving raw scan data to disk	error
`lwrite of to plot.dat error`	Failed to write processed data to plot.dat file	Saving processed plot data to disk	error
`plot timeout`	Plot generation or rendering did not complete within expected time	Plot rendering operation	warning
`scan positioning timeout`	Scan positioning operation did not complete within expected timeframe	Attempted to position scan but system failed to respond within timeout period	error
`sdovsp`	Scan drive overspeed	Scan frame rotation speed exceeds safe limit	warning
`sdperr`	Scan drive position error	Scan frame actual position differs from commanded reference	error
`sdract`	Scan drive active - status signal indicating proper operation	Scan drive is functioning normally	info
`spmflt`	Scan position measurement fault	Fine RDC input signal lost or RDC failure; excitation or winding loss	critical
`Superblock corruption`	Test termination due to superblock corruption or attempting to run test on image disk	Running option 0 or option 5 on newly formatted, virgin disk, or disk with previous destructive test run	warning
`Test 1`	SCI DATA communication error	SCI DATA timeout or communication integrity error during boot	error
`Test 10`	Level 4 PITR interrupt	Level 4 PITR interrupt not properly cleared	error
`Test 11`	PITR count out of range	PITR timer count value outside acceptable range	error
`Test 12`	Multiple interrupts in timer mode	More than one interrupt detected during timer mode test	warning
`Test 13`	Unexpected DUART interrupt	DUART status interrupt detected during test	warning
`Test 2`	SCI Data mismatch error	Transmitted and received SCI data do not match	error
`Test 3`	NOVRAM data error	NOVRAM data read/write failure or checksum mismatch	error
`Test 4`	MC68332 RAM error	MC68332 processor RAM test failure	error
`Test 5`	Static memory data error	Static memory write/read test failure	error
`Test 6`	Static RAM march memory error	Static RAM march pattern test failure	error
`Test 7`	Bus error	CPU system bus communication error	error
`Test 8`	DUART no level 2 interrupt	DUART level 2 interrupt signal not detected	error
`Test 9`	DUART counter interrupt status bit error	DUART counter interrupt status incorrect during test	error
`Test termination due to superblock corruption`	Hard drive diagnostic terminated because superblock is corrupted or test attempted on image disk	Running diagnostic option 0 or 5 on newly formatted, virgin, or recently destructively tested disk	warning
`timeout on signal from acceldma done`	Expected completion signal from acceldma module not received	Scan execution	error
`timeout on signal from acceldma to start scan`	Expected start signal from acceldma module not received within timeout	Scan initiation sequence	error
`too many beginning points out of range`	Initial data points at scan start exceed acceptable range	Data validation at scan beginning	warning
`too many points out of range`	Excessive number of data points exceed acceptable value range	Data validation after scan or plot generation	warning

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.