CT scanners · CT family

GE Healthcare CT Legato: troubleshooting and error codes

The ServiceForge knowledge base holds 155 documented symptoms for the GE Healthcare CT Legato, with 210 ranked causes, 646 diagnostic checks with test points and expected values, and 3 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Calibration: Record Other Customer Data

Record Set Display, Preset Sequence, Auto View, Auto WW/WL, Preset Voice Timing, Advanced Noise Reduction, and Thickness-MA Link data before LFC.

Ranked causes

1. Image display settings loss during LFC (common)
2. Preset sequence loss during LFC (occasional)
3. Auto View settings loss (occasional)
4. Auto WW/WL preset loss for anatomical regions (occasional)
5. Advanced Noise Reduction settings loss (rare)
6. Thickness-MA Link settings loss (rare)

First check

Record Set Display data

Test point: [Image Trtmnt] key > SET DISPLAY menu
Expected: Set Display parameters recorded in Table 5

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

Calibration: Intercomm board potentiometers adjustment

Adjustment of potentiometers R3, R5, R10, R16, R82, R100 on Intercomm board for console and gantry audio functions.

Ranked causes

1. Potentiometer R3 requires console maximum volume adjustment (unknown)
2. Potentiometers R5 and R10 require gantry minimum volume adjustment (unknown)
3. Potentiometer R16 requires help switch volume adjustment (unknown)
4. Potentiometer R82 requires help switch delay adjustment (unknown)
5. Potentiometer R100 requires autovoice detect delay adjustment (unknown)

Calibration: Operator Console jumpers and switches high voltage

Setting DIP switches and jumpers on CPW, IPU2, DISP, SBPU and TPC circuit boards in nest chassis for correct boot mode, test mode, memory configuration, and interrupt levels.

Ranked causes

1. CPW board switches and jumpers require configuration (common)
2. IPU2 board switches and jumpers require configuration (common)
3. DISP board jumpers require configuration (common)
4. SBPU board jumper JPR4 requires configuration (occasional)
5. TPC board has reset and abort switches (occasional)

First check

Verify electrostatic discharge precaution

Test point: Technician wrist
Expected: Anti-static wrist strap worn and grounded

1 more check with pass and fail actions, 21 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Autovoice feedback during gantry operation

During autovoice operation, gantry microphone is not disabled, causing autovoice reproduced at gantry to transmit back to scan box, making scan box volume too high and difficult to adjust.

Ranked causes

1. Autovoice detect signal level too low to disable gantry microphone (common)
2. Gantry Interface board Rev. G with inverted autovoice signals (occasional)
3. Unbalanced autovoice gain due to software bug (common)
4. Adjust gain parameters for Rev. G board (common)

First check

Identify Gantry Interface board revision in Scan Tower

Test point: Gantry Interface board 2117167
Expected: Rev. F or Rev. G

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

Calibration: Autovoice Signal Detect (Intercomm Board)

Adjust intercomm board potentiometers to optimize autovoice detection and disable gantry microphone during playback; compensate for Gantry Interface board revision differences.

Ranked causes

1. Autovoice detect signal level too low to disable gantry microphone (common)
2. Gantry Interface board Rev. G signal inversion (autovoice channels swapped) (occasional)
3. Software gain imbalance due to SCANBOX_GAIN formula (2x multiplication) (common)
4. Incorrect GANTRY_GAIN or SCANBOX_GAIN values for board revision (occasional)

First check

Measure autovoice detect signal level at gantry speaker input

Test point: Intercomm board autovoice input during message playback
Expected: Signal level sufficient to trigger gantry microphone disable
Tools: Oscilloscope

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

Failure Analysis during ATINST execution

Errors occurring during ATINST program execution; two types: ATINST program error or deviation between execution and expected Text File.

Ranked causes

1. FAIL LED lit on CPW Board (rare)
2. HALT LED lit on CPW Board (rare)
3. Program abort or hardware failure (occasional)
4. Log File deviation from Text File (occasional)

First check

Monitor FAIL LED on CPW Board during ATINST

Test point: CPW Board Slot #1 FAIL LED
Expected: LED off (normal state)

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

Calibration: DAS offset data

Verify DAS electronics output DC-offset values within proper range with no X-ray input to detector; check offset drift and axial noise contribution

Ranked causes

1. Excessive DAS offset DC value (LGT, SRI) (unknown)
2. Excessive DAS offset standard deviation (LGT, SRI) (unknown)
3. DAS offset stationary, drift, or axial test failure (SNG) (unknown)

First check

MEAN MAX and MIN values without offset file correction

Test point: STATISTICS display
Expected: MEAN MAX ≤ 1000, MEAN MIN ≥ 100

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

Calibration: Pre-ATINST Procedure - Save Customer Data

Archive patient images, raw data, and communication data before LFC destroys hard disk information.

Ranked causes

1. Data loss during LFC procedure (common)
2. Raw data file loss during LFC (common)
3. Communication data loss if ELINK installed (occasional)

First check

Save patient image data

Test point: Image File Management function
Expected: Patient images archived to MOD or floppy disk

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

Calibration: Rotor Board (Part No. 2103713) jumper configuration high voltage

Setup of normal jumper settings for 550V protection, stator protection, and clock frequency on Rotor Board

Ranked causes

1. 550V OK protection jumper setting (common)
2. Stator open protection jumper setting (common)
3. Clock frequency divider setting (common)

First check

Verify JP1 position

Test point: Rotor Board JP1
Expected: Position A (550V OK protection enabled)

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

Calibration: Rotor Board (Part No. 2121852) switch configuration high voltage

Setup of normal switch settings for 550V protection, stator protection, and stator current control on alternate Rotor Board

Ranked causes

1. 550V OK protection switch setting (common)
2. Stator open protection switch setting (common)
3. Stator current control switch setting (common)

First check

Verify ST1 position

Test point: Rotor Board ST1
Expected: 2-3 short (550V OK protection enabled)

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

Gantry does not initialize rotation caution

Gantry fails to rotate during initialization sequence; LEDs ERRG and LOOPG alternate on TGP Board

Ranked causes

1. TGP Service switch SYS/OFF/MNL set to OFF (common)
2. Servo Amp breaker not set to ON (occasional)
3. Azimuth Lock pin engaged (occasional)

First check

Verify TGP Service switch positions

Test point: TGP Board switches
Expected: SYS/OFF/MNL=SYS, ABT/SVE/FIX=FIX, SPD2/SPD1/SPD0=SPD0, FAST/MID/SLOW=SLOW, CONT/HOME/90°=HOME

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

Gantry service switch control settings patient safety

TGP Board service switches control manual gantry rotation for maintenance. Incorrect settings or operations can cause servo overload or brake damage.

Ranked causes

1. SYS/MNL switch set to OFF during gantry rotation (occasional)
2. Repeated gantry acceleration/deceleration over short period (occasional)
3. Gantry rotated by hand causing abnormal behavior (rare)

First check

Verify SYS switch position during normal operation

Test point: TGP Board SYS switch
Expected: SYS (normal position), not OFF

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

Home button gantry and table reset malfunction caution

Gantry does not return to 0° position, table does not move to Out limit or lowest position when Home button is pressed.

Ranked causes

1. Home button or gantry tilt motor control issue (common)
2. Table Up/Down motor or limit switch malfunction (common)
3. Cradle In/Out motor or limit switch issue (occasional)

First check

Prepare gantry and table to test Home function

Test point: Initial table and gantry positions
Expected: Table at approximately -50 mm height, cradle at 200 mm from Out limit, gantry tilted to BWD or FWD limit

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

Positioning light (POSN Light) button malfunction

Positioning lights do not turn on when POSN Light button is pressed, or do not turn off automatically after 1 minute.

Ranked causes

1. POSN Light button or light circuit failure (common)
2. Positioning light auto-off timer malfunction (occasional)
3. TGP Board reset needed (occasional)

First check

Verify POSN Light button causes gantry home rotation

Test point: Gantry angle and POSN Light button input
Expected: Gantry rotates to home position (0 degrees) when POSN Light button pressed

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

ATINST program error during execution

FAIL LED or HALT LED lit on CPW Board during software loading, or 'Current Task Aborted Unexpectedly' message with file name and error code displayed.

Ranked causes

1. Program abort due to program bug or hardware failure (occasional)
2. Deviation between program execution and expected execution (occasional)

First check

Inspect FAIL LED status on CPW Board

Test point: FAIL LED indicator on CPW Board
Expected: LED off (normal), LED on indicates bus error (abnormal)

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

Calibration: +12 VDC power supply voltage high voltage

Output voltage of +12 VDC supply on Operator Console (LGT, SRI models) must be checked and adjusted to specification during installation.

Ranked causes

1. Output voltage outside specification (unknown)
2. Power supply ripple exceeds specification (unknown)

First check

Voltage output of +12 VDC supply

Test point: Terminal strip on front of power supply
Expected: +11.8 VDC ∼ +12.4 VDC, +11.8 to +12.4
Tools: Digital multimeter (voltage mode)

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

Calibration: +5 VDC power supply voltage high voltage

Output voltage of +5 VDC supply on Operator Console (LGT, SRI models) must be checked and adjusted to specification during installation.

Ranked causes

1. Output voltage outside specification (unknown)
2. Power supply ripple exceeds specification (unknown)

First check

Ground connection resistance

Test point: OC ground stud to power supply ground
Expected: less than 0.2 Ω, < 0.2
Tools: Digital multimeter (resistance mode)

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

Calibration: Audio function setup

Configuration of intercom, buzzer, touch panel tone, and auto voice settings on AUDIO2 board

Ranked causes

1. AUDIO2 board variable resistors not set to default values (common)
2. X-ray buzzer, touch panel tone/volume, or auto voice jumpers incorrect (common)

First check

Access AUDIO2 board

Test point: AUDIO2 board location
Expected: Board accessible with jumpers and variable resistors

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

Calibration: CTVRC Board jumper and optical fiber cable configuration high voltage

Setup of normal jumper positions and optical fiber cable connections on CTVRC Board

Ranked causes

1. CTVRC Board jumper configuration (common)
2. Optical fiber cable disconnection (common)

First check

Verify all jumpers JP1 through JP8 position

Test point: CTVRC Board JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8
Expected: 'ZJ' side

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

Calibration: DAS data transfer

Verify sample data correctly transmitted from CIF board (DAS assy) to DAS I/F board (Scan Tower) and compared at CPU in workstation

Ranked causes

1. DAS data transfer malfunction (LGT, SRI) (unknown)
2. DAS data transfer malfunction (SNG) (unknown)

First check

DAS Data Transfer Test result indication (LGT, SRI)

Test point: display
Expected: PASS 1 indication displayed

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

Calibration: OC Power-up sequence

System self-test and boot process verification after power on

Ranked causes

1. Boot Mode Select switch (10A1) not set correctly (common)
2. Test Mode Select switch (8A1) not set correctly (common)

First check

Verify Boot Mode Select switch setting

Test point: DNP4 at location 10A1
Expected: X X X 0 (Boot from HD00)

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

Calibration: Sony CRT monitor raster size and tilt

Raster size and tilt on Sony Type 20E01 monitor should be set to nominal conditions; additional adjustments only if required.

Ranked causes

1. Raster size outside nominal (rare)
2. Raster tilt not at nominal (rare)

First check

Raster vertical and horizontal size

Test point: Monitor display area
Expected: Raster fills screen at nominal size
Tools: Visual inspection

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

Calibration: Sony CRT monitor setup (SNG)

Sony Type 20E01 monitor requires proper setup to ensure displayed images match filmed images and to correct display fill issues.

Ranked causes

1. Monitor type not configured (occasional)
2. Color temperature not at specification (occasional)

First check

Monitor type configuration

Test point: Monitor display during startup
Expected: Application startup screen fills entire screen
Tools: Visual inspection

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

Calibration: XG Controller jumper and switch configuration high voltage

Setup and verification of normal jumper and switch settings on CPU Board of XG Controller

Ranked causes

1. Initial configuration of CPU Board jumpers and switches (common)
2. CPU Board push switch configuration (common)

First check

Verify no jumpers installed on ST1, ST2, ST5 through ST8, ST10

Test point: CPU Board ST1, ST2, ST5, ST6, ST7, ST8, ST10
Expected: No jumpers installed

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

DTRE Board LED status indication

DS1 and DS2 LEDs on DTRE Board provide diagnostic status for power supplies and signal activity.

Ranked causes

1. Loss of DC 5V power to DTRE Board (rare)
2. Loss of DC 24V power to DTRE Board (rare)

First check

Verify DS1 LED illuminated for 5V power

Test point: DTRE Board DS1 LED
Expected: LED illuminated (5V present)

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

Gantry cradle horizontal (In/Out) movement control malfunction caution

Cradle does not move smoothly In and Out, or fast speed function does not work correctly when buttons pressed together.

Ranked causes

1. In/Out button or motor control issue (common)
2. Fast speed function disabled or faulty (occasional)

First check

Verify cradle moves In smoothly at normal speed

Test point: In button control and cradle position
Expected: Cradle moves In smoothly when In button pressed

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

Gantry panel table vertical position control malfunction caution

Table does not move smoothly in up/down direction when buttons are pressed, or display does not change correctly during height adjustment.

Ranked causes

1. Table Up/Down button or motor control issue (common)
2. Foot switch malfunction (occasional)

First check

Verify Table responds to Down button command

Test point: Table position control
Expected: Table reaches lowest position when Down button is pushed

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

Gantry rotates with abnormal noise or jerky motion caution

During movement check, Gantry shows abnormal noise or does not rotate smoothly at any speed setting

Ranked causes

1. Mechanical friction or misalignment in rotation mechanism (common)
2. Improper service switch settings during movement check (occasional)

First check

Observe Gantry rotation at SLOW speed with SPD0

Test point: Gantry movement
Expected: Smooth rotation with no abnormal noise for more than one rotation

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

Move to Scan and Zero button control malfunction caution

Cradle does not move correctly to scan position, position display does not increment properly, or zero position reference not established.

Ranked causes

1. Zero button not setting position reference (common)
2. Move to Scan button or In motor malfunction (common)

First check

Set table position to zero reference point

Test point: Table position display
Expected: Table position display shows 000

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

Sub Board switch function malfunction caution

Operation enable switches or motor control switches on SUB Board do not control Table and Gantry movement correctly.

Ranked causes

1. Operation enable switch (UPE, DOWNE, FWDE, BWDE) failure (common)
2. Motor control switch (UP, DOWN, FWD, BWD) failure (common)

First check

Prepare for SUB Board switch testing

Test point: Gantry left cover and cradle position
Expected: Gantry left cover removed, cradle positioned approximately 100 mm from Out limit

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

Table and Gantry interlock malfunction patient safety

Table Up/Down and Gantry Tilt functions do not interlock correctly in restricted patient zones, or interlock prevents normal operations outside restricted zones.

Ranked causes

1. Interlock sensor or control circuit malfunction (common)
2. Interlock disabled outside protected zone (occasional)

First check

Position equipment at interlock test zone

Test point: Table, gantry tilt, and cradle positions
Expected: Table at highest position, gantry tilted to 0°, cradle at any position except Out limit

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

ABT switch spring-loaded gantry rotation

ABT (abort/start) switch is spring-loaded and starts gantry rotation with speed fixed at 15.0 sec/Rev, with endpoint determined by CONT/HOME/90° selector.

Ranked causes

1. Unintended gantry rotation via ABT switch (rare)

First check

Verify ABT switch rotation speed

Test point: Gantry rotation duration
Expected: 15.0 seconds per revolution when ABT held

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Bow-tie filter attenuation curve irregular or out of specification radiation

Filter curve measurement shows non-smooth attenuation profile or fails specification during calibration check

Ranked causes

1. Bow-tie filter material deteriorated, cracked or broken (common)

First check

Verify DAS/Detector warm-up and X-ray alignment prerequisites

Test point: System warm-up time and alignment status
Expected: DAS/Detector powered ON for >2 hours; Plane of Rotation, Detector Beam-on-Window, Iso Center Alignment, Filter Center Alignment all proper

7 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: ADC Board (2106694) jumper settings

Set jumpers and switches on ADC board to factory normal configuration

Ranked causes

1. Jumper configuration required during assembly or service (unknown)

First check

Verify J1 installed

Test point: J1
Expected: Installed

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

Calibration: ADC Board (2164052) jumper settings

Set jumpers and switches on updated ADC board to factory normal configuration

Ranked causes

1. Jumper configuration required for 2164052 board variant (unknown)

First check

Verify J100 position

Test point: J100
Expected: 1 or 2

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

Calibration: AUDIO2 Board DIP switch SW1 settings

Configuration of DIP switch SW1 on AUDIO2 Board for audio function control with 8 bits, normally set as illustrated.

Ranked causes

1. DIP switch SW1 controls AUDIO2 board audio functions (common)

First check

Verify AUDIO2 Board SW1 DIP switch configuration

Test point: SW1 on AUDIO2 Board
Expected: All 8 bits positioned as illustrated on page 512 diagram

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: AUDIO2 Board DIP switch SW2 settings

Configuration of DIP switch SW2 on AUDIO2 Board for audio function control with 8 bits, normally set as illustrated.

Ranked causes

1. DIP switch SW2 controls AUDIO2 board audio functions (common)

First check

Verify AUDIO2 Board SW2 DIP switch configuration

Test point: SW2 on AUDIO2 Board
Expected: All 8 bits positioned as illustrated on page 512 diagram

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: AUDIO2 Board microphone type jumper JP3

Configuration of jumper JP3 on AUDIO2 Board to select new or old microphone type.

Ranked causes

1. Jumper JP3 selects microphone type (new or old) (common)

First check

Verify AUDIO2 Board JP3 microphone type selection

Test point: JP3 on AUDIO2 Board
Expected: Positioned for NEW or OLD microphone type

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: AUDIO2 Board PM Tone jumper JP4

Configuration of jumper JP4 on AUDIO2 Board to set PM tone level (HI to LO) with normal setting at pins 5-6.

Ranked causes

1. Jumper JP4 adjusts PM tone frequency level (common)

First check

Verify AUDIO2 Board JP4 PM tone jumper position

Test point: JP4 on AUDIO2 Board
Expected: Positioned at pins 5-6 (normal) or adjusted per field requirements

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: AUDIO2 Board PV Volume jumper JP5

Configuration of jumper JP5 on AUDIO2 Board to set PV volume level (MAX to MIN) with normal setting at pins 3-4.

Ranked causes

1. Jumper JP5 adjusts PV volume level from MAX to MIN (common)

First check

Verify AUDIO2 Board JP5 PV volume jumper position

Test point: JP5 on AUDIO2 Board
Expected: Positioned at pins 3-4 (MID) for normal setting

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: AUDIO2 Board record input jumper JP1

Configuration of jumper JP1 on AUDIO2 Board to select microphone or line-level input for recording.

Ranked causes

1. Jumper JP1 selects microphone or line-level input for recording (common)

First check

Verify AUDIO2 Board JP1 record input selection

Test point: JP1 on AUDIO2 Board
Expected: Positioned on MIC pins (1-2-3) or LINE pins (4-5-6)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: AUDIO2 Board TBOZ Tone jumper JP6

Configuration of jumper JP6 on AUDIO2 Board to set TBOZ tone level (HI to LO) with normal setting at pins 3-4.

Ranked causes

1. Jumper JP6 adjusts TBOZ tone frequency level (common)

First check

Verify AUDIO2 Board JP6 TBOZ tone jumper position

Test point: JP6 on AUDIO2 Board
Expected: Positioned at pins 3-4 (normal) for MID tone level

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: AUDIO2 Board TBUZ Volume jumper JP7

Configuration of jumper JP7 on AUDIO2 Board to set TBUZ volume level (MAX to MIN) with normal setting at pins 3-4.

Ranked causes

1. Jumper JP7 adjusts TBUZ volume level from MAX to MIN (common)

First check

Verify AUDIO2 Board JP7 TBUZ volume jumper position

Test point: JP7 on AUDIO2 Board
Expected: Positioned at pins 3-4 (MID) for normal setting

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: AUDIO2 Board volume source jumper JP2

Configuration of jumper JP2 on AUDIO2 Board to select internal or external volume control. Different positions apply to AUDIO2 P9201VL versus AUDIO2 2121789 models.

Ranked causes

1. Jumper JP2 selects internal or external volume control source (common)

First check

Verify AUDIO2 Board model and JP2 volume control selection

Test point: JP2 on AUDIO2 Board; check board model label (P9201VL or 2121789)
Expected: P9201VL: INT (pins 1-2-3); 2121789: EXT (pins 4-5-6)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: AUDIO2 Board XBUZ Volume jumper JP8

Configuration of jumper JP8 on AUDIO2 Board to set XBUZ volume level (MAX to MIN) with normal setting at pins 3-4.

Ranked causes

1. Jumper JP8 adjusts XBUZ volume level from MAX to MIN (common)

First check

Verify AUDIO2 Board JP8 XBUZ volume jumper position

Test point: JP8 on AUDIO2 Board
Expected: Positioned at pins 3-4 (MID) for normal setting

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Autovoice time constant adjustment

Adjust R100 potentiometer on Intercomm board to set elapsed time between autovoice OFF and gantry microphone ON to approximately 0.5 second

Ranked causes

1. Autovoice timing requires calibration (common)

First check

Set R100 potentiometer to initial position

Test point: R100 potentiometer, Intercomm board (Scan Tower)
Expected: Fully clockwise, then 3/4 to 1 rotation counter-clockwise

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

Calibration: Azimuth belt tension caution

Azimuth drive belt tension requires adjustment by rotating adjusting bolt until parts A and B just touch without over-tensioning, approximately 2-3 mm initial gap.

Ranked causes

1. Azimuth belt tension out of specification requiring adjustment (common)

First check

Switch OFF Rotate and XG switches

Test point: Gantry rear base
Expected: Both switches OFF

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

Calibration: CAM amplifier linearity (no X-rays)

Verify linearity of CAM amplifier by performing six DAS test scans at different gain levels and calculating mean file ratios within acceptable tolerance

Ranked causes

1. CAM amplifier linearity calibration required (common)

First check

Verify DAS/Detector warm-up time

Test point: DAS/Detector power status
Expected: Powered ON for at least two hours

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

Calibration: CIF Board jumper settings

Set jumpers and switches on CIF board to factory normal configuration

Ranked causes

1. Jumper configuration required during CIF board assembly or service (unknown)

First check

Verify J1 position

Test point: J1
Expected: ON (ZDOR)

6 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Cradle absolute position control at 1525 mm

Adjust PG potentiometer to establish second reference point at 1525 mm cradle position for accurate absolute position tracking across full range

Ranked causes

1. Position potentiometer calibration requires second reference point after 5 mm adjustment (common)

First check

Move cradle in direction until display reads 1520 mm

Test point: Cradle IN button and display reading
Expected: Display shows 1520 (1520 mm from out limit)

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

Calibration: Cradle absolute position control at 5 mm

Adjust position potentiometer to establish reference point at 5 mm cradle position for accurate absolute position tracking

Ranked causes

1. Position potentiometer calibration required after replacement (occasional)

First check

Remove gantry left side cover

Test point: Gantry left side
Expected: Cover removed for access

11 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Cradle step move operation

Verify encoder repeatability through incremental moves; cradle position error after multiple steps should be within specification

Ranked causes

1. Encoder accumulation error or step repeatability drift (occasional)

First check

Set gantry tilt position

Test point: Gantry tilt
Expected: 0°

10 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Cradle travel accuracy

Encoder and related mechanics/electrics require verification; display reading does not match actual cradle movement distance

Ranked causes

1. Encoder or position transducer calibration drift (occasional)

First check

Set gantry tilt position

Test point: Gantry tilt
Expected: 0°

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Calibration: CRT monitor controls and switches (LGT, SRI)

CRT monitor rear panel controls must be set to specified positions during installation.

Ranked causes

1. Controls and switches not at specification (unknown)

First check

CRT ON/OFF switch position

Test point: CRT monitor rear panel
Expected: ON
Tools: Visual inspection

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

Calibration: DAS IF Board jumper settings

Configuration of jumpers J2, J3, J4, J5 on DAS I/F Board for proper data acquisition system interface. Cross-reference with DTRE Board jumper settings when replacing DAS IF Board.

Ranked causes

1. Jumpers J2, J3, J4, J5 configure DAS I/F Board interface (common)

First check

Verify DAS IF Board jumper J2 position

Test point: J2 on DAS I/F Board
Expected: Open (OPEN)

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

Calibration: DAS linearity verification

Verify linearity of input circuits and amplifiers for each channel on CAM (NCAM) boards across three gain ranges of Programmable Gain Amplifiers (R1, R2, R3 tests)

Ranked causes

1. Linearity calibration required (common)

First check

Verify DAS/Detector warm-up time

Test point: DAS/Detector power status
Expected: Powered ON for at least two hours

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

Calibration: DAS microphonic test

Detect intermittent pop noise and determine effects of tube anode rotation and axial rotation on data collection system microphonic noise

Ranked causes

1. DAS microphonic noise verification required (common)

First check

Verify DAS/Detector warm-up time

Test point: DAS/Detector power status
Expected: Powered ON for at least two hours

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

Calibration: DAS output DC calibration

Verify DAS output at three gain ranges of CAM (NCAM) PGA (Programmable Gain Amplifiers) with fixed reference voltages is within proper range

Ranked causes

1. DAS output DC calibration out of range (SNG) (unknown)

First check

DAS count data L×64 (64L) test result

Test point: VIEW MESSAGE display
Expected: PASSED

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

Calibration: DAS output X-ray radiation

Verify DAS output response with X-ray input using same analysis specifications as tube warm-up calibration scan

Ranked causes

1. DAS output X-ray response out of specification (SNG) (unknown)

First check

DAS output X-ray test result and graph

Test point: VIEW MESSAGE and GRAPH display
Expected: PASSED; graph shows typical response (0–600 channels, 500–5000 range)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: DAS Splitter board jumper configuration

Configure jumpers J2 and J3 on DAS Splitter board for DT board diagnostics operation.

Ranked causes

1. DAS Splitter board jumper configuration for diagnostics (common)

First check

Verify J2 jumper position

Test point: J2 header pins 1-2, 25-26
Expected: OFF (no jumper installed)

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More symptoms

Calibration: DC output voltage
Calibration: DC Power Supplies on Rotative Frame (Gantry 212180x, 213729x, 217497x)
Calibration: DC Power Supplies on Rotative Frame (Gantry P9223xx)
Calibration: DC Power Supplies on Stationary Frame
Calibration: Detector Beam-on-Window
Calibration: DT Daughter board JP5 External Ready jumper
Calibration: DTR2 Board jumper settings
Calibration: DTRE Board jumpers
Calibration: EISA Riser Board configuration
Calibration: ETC 2 board switch and jumper settings
Calibration: ETC board jumper and switch settings
Calibration: Filter center alignment
Calibration: G. pulse position
Calibration: Gantry rotation speed
Calibration: Gantry rotation velocity offset
Calibration: Gantry tilt angle
Calibration: Gantry tilt BWD 25° position
Calibration: Gantry tilt rotation
Calibration: Image Performance Verification
Calibration: Intercomm Board alternate gain resistor jumper JP6
Calibration: Intercomm Board autovoice function jumper JP4
Calibration: Intercomm Board gantry microphone 1 bias jumper JP1
Calibration: Intercomm Board gantry microphone 2 bias jumper JP2
Calibration: Intercomm Board gantry microphone ground jumper JP3
Calibration: Intercomm Board Rhapsode system jumper JP5
Calibration: KV and MA output verification
Calibration: KV Board jumper configuration for test mode selection
Calibration: KV control test (Synergy models)
Calibration: Main weight adjustment
Calibration: Motor maximum torque adjustment via voltage
Calibration: MTC board jumper and switch settings
Calibration: OGP Board DIP switches
Calibration: Operational checks
Calibration: Operator console jumper and switch settings
Calibration: Panasonic monitor input frequency check
Calibration: Panasonic monitor parallelogram distortion correction
Calibration: Panasonic monitor trapezoidal distortion correction
Calibration: Panasonic monitor user color adjustment
Calibration: PDU jumper and switch configuration
Calibration: Plane of Rotation
Calibration: Post-ATINST software upgrade to V2.00
Calibration: Record Custom Parameters
Calibration: Reference channel output verification
Calibration: Scan Tower power supplies (+5V, +12V, -12V)
Calibration: SCANBOX_GAIN and GANTRY_GAIN parameters
Calibration: Screw tightening torque
Calibration: Side weight adjustment
Calibration: Software loading to V3.01
Calibration: Sony CRT monitor brightness and contrast
Calibration: Sony CRT monitor convergence and pincushion
Calibration: Sony CRT monitor raster centering
Calibration: SV AMP Board jumper J1 setting
Calibration: System software configuration restoration
Calibration: Table elevation function
Calibration: TGP Board DIP switches
Calibration: Tilt guide roller clearance
Calibration: Tilt roller rotation
Calibration: Tilt speed
Calibration: Touch sensor functionality
Calibration: TPC SUB Board baud rate and touch panel scan rate
Calibration: TPC SUB Board parity and stop bit settings
Calibration: TPC SUB Board RS232C control mode
Calibration: Workstation rear side jumper and DIP switch settings
Calibration: X-ray isocenter alignment
Collimator aperture ratio out of specification
Cradle motor maximum torque adjustment required
Cradle motor maximum torque out of range
Cradle parallel alignment incorrect
Cradle support bearing clearance excessive
Cradle unlatch switch inoperative
DT daughter board failure
FIX switch variable-speed gantry rotation
Gantry cover safety bracket switches disengaged
Gantry manual rotation speed control
Gantry rear base switches configuration
Gantry rotation endpoint selection
Gantry Tilt Range display malfunction
Gravity sag fluctuation exceeds limits
Host diagnostics test failure
Image reconstruction test failure
Main circuit breaker SW20 inoperative
MISC2 board reset function
MISC2 board test function
Network image transmission test fails on Sytec Synergy
Positioning light adjustment out of alignment
Precondition: DAS warm-up time
Recon board failure
Restore Custom Parameters after ATINST
Scan box button/LED failure
Sudden high-speed Gantry rotation during operation
SVE signal disabled causing gantry rotation failure
System startup verification after software V3.00 load
System V/R 3.00 prerequisite not met
Wire cable tension incorrect
X-ray beam not centered on detector window

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

Error codes

Code	Meaning	Trigger	Severity
`0505`	Gantry backward tilt limit reached	Gantry tilted backward to maximum mechanical limit	warning
`6122`	Reconstruction process error in axial_recon.c module	Occurs during recon image test execution on host ctmini5	warning
`FHS ERROR C2`	File system initialization error during version revision	Entered during V2.01 or V2.02 revision update procedure	info

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.