Test equipment bone densitometers

Hologic Discovery QDR: troubleshooting and error codes

The ServiceForge knowledge base holds 85 documented symptoms for the Hologic Discovery QDR, with 151 ranked causes, 194 diagnostic checks with test points and expected values, and 112 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

No display or abnormal display radiation

No scan display, completely white screen, completely dark screen, blotchy or grainy display

Ranked causes

1. Tube kV peak potential out of specification (common)
2. Tube current out of specification (common)
3. X-ray beam misalignment (common)
4. Poor signal strength or excessive noise (common)
5. Aperture position or aperture belt problem (common)
6. Filter Drum not rotating (occasional)
7. Filter Drum belt failure (occasional)
8. C-Arm Interface board failure (occasional)
9. Aperture plate assembly or collimator contamination (rare)
10. Bad Detector Assembly (occasional)

First check

Verify Tube kV peak potential

Test point: X-ray tube
Expected: Within specification

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

Detector flattening procedure fails consistently radiation

System cannot complete or pass detector flattening verification procedure

Ranked causes

1. Loose or misaligned aperture assembly (common)
2. Unstable or dancing X-rays (common)
3. X-ray waveform distortion (occasional)
4. ADC gain level incorrect (occasional)
5. Bad detectors in detector assembly (occasional)
6. Filter Drum installed incorrectly or defective segment (occasional)
7. Lead fragments in X-ray beam (rare)
8. X-rays hitting table edge during whole body scan (occasional)

First check

Inspect aperture assembly for misalignment

Test point: Aperture assembly, collimator cup, pre-collimator disk
Expected: Properly aligned, no loose parts

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

Laser does not turn off patient safety

Laser remains active when control is switched off

Ranked causes

1. Laser button on Control Panel stuck or defective (common)
2. Control panel laser switch failure (occasional)
3. C-Arm Interface Board defective (occasional)
4. Distribution Board defective (occasional)
5. Interconnect cable failure (occasional)
6. Computer assembly defective (rare)

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

Table top radiographic uniformity out of specification radiation

Global Stats S.D. value indicates improper X-ray beam alignment or instrument misalignment during whole body air scan

Ranked causes

1. Loose wires or debris between table and tank (occasional)
2. Aperture misalignment or calibration drift (common)
3. AC line voltage out of specification (occasional)
4. +/- 15V power supply voltage out of specification (occasional)
5. Detector flattening calibration drift (occasional)
6. Table pad or tabletop physical damage (rare)

First check

Perform whole body air scan

Test point: Discovery scanner with only pad on table
Expected: Scan completes without interruption
Tools: Discovery QDR system

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

Horizontal stripe in display image radiation

Horizontal line, band, or banding pattern visible across X-ray image on display

Ranked causes

1. Tube kV (peak potential) out of specification (common)
2. Tube current out of specification (common)
3. Line voltage or power ground instability (occasional)
4. Filter drum not rotating or belt slipping (occasional)
5. X-ray controller malfunction (banding artifacts) (occasional)

First check

Measure tube kV peak potential

Test point: X-ray controller kV output
Expected: Within ±5% of system set value (typically 100 kV for bone density)

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

Bad checksum in message caution

Checksum calculated by C/C does not match checksum in message packet, indicating communication error

Ranked causes

1. Driver incorrectly configured (common)
2. Devices jumpered to debug mode (occasional)
3. Hardware problem on communication link (occasional)
4. DSP chips not properly seated (occasional)

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

Laser crosshair beam is defective patient safety

Laser beam does not form proper crosshair pattern or is misaligned

Ranked causes

1. Laser block assembly mirrors broken, cracked or misaligned (occasional)
2. Laser shutter closed (common)
3. Laser aperture obstructed (common)
4. Laser misaligned to perpendicular (occasional)

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

Laser does not turn on patient safety

Laser fails to activate when requested by software or operator control

Ranked causes

1. Software inhibiting laser due to C-arm position (common)
2. Laser power connector not supplying +5VDC (common)
3. C-Arm Interface Board failure (occasional)
4. AY motor calibration file corrupt or uncalibrated (occasional)

First check

Position C-arm and retry laser

Test point: C-arm position
Expected: C-arm at center of table

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

Scanner motion not responding or limited caution

Table or C-arm does not move, moves in wrong direction, or moves but jerks or stops unexpectedly

Ranked causes

1. Motor encoder not properly calibrated (common)
2. Drive belt worn, slipping, or misaligned (occasional)
3. Encoder coupling slipped or damaged (occasional)
4. Motor or gearbox mechanical fault (occasional)

First check

Identify which axis is not moving per operator description and motion diagram

Test point: Scanner - refer to Figure 6-1 for motion directions (TX, TY, TZ, AR, AY, etc.)
Expected: Clear identification of failed axis

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

System does not power on high voltage

System appears dead or unresponsive, no power indicators

Ranked causes

1. Main circuit breaker open or off (common)
2. Emergency Stop switch engaged or Instrument On/Off switch off (common)
3. Power cable disconnected or faulty (occasional)
4. Main fuses blown (occasional)

First check

Verify main circuit breaker state

Test point: Rear of foot end pedestal
Expected: Breaker in ON position

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

Unable to position device within specified tolerance [E_TOLERANCE_I]

Stepping motor, aperture shuttle, or TZ drive failed to reach requested position

Ranked causes

1. TZ drive firmware outdated (common)
2. TZ drive thermal overload (occasional)
3. Stepping motor not calibrated or binding (occasional)
4. Aperture shuttle not calibrated or binding (occasional)

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

X-ray beam misaligned radiation

X-ray beam does not align properly to drop-off points per alignment procedure

Ranked causes

1. Aperture 10 misaligned (common)
2. Collimator cup or pre-collimator disk misaligned (occasional)
3. X-ray tube shifted within lethargy (rare)

First check

Align X-ray beam to drop-off points

Test point: Aperture 10
Expected: Alignment block and pin line up with 3-8 turns of hex driver

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

24V LED not lit on distribution board caution

DC power supply 24V rail indicator not illuminated, suggesting loss of 24V supply

Ranked causes

1. Fuse blown on 24V supply or related circuit (common)
2. Tape switch or connector problem detecting open circuit (occasional)

First check

Inspect 24V supply fuses on distribution board

Test point: Distribution board - 24V fuse positions per Figure 5-1
Expected: Fuses intact with no visible opens or burnt elements

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

Analyze data file missing or invalid

Required ANALYZE.DAT file not found or contains no valid entries

Ranked causes

1. Software not correctly installed (common)
2. Hard disk drive hardware problem (occasional)

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

C-arm and table collision imminent caution

C-arm and table are calculated to be within 1/4 inch of each other, danger of collision

Ranked causes

1. Operator moved C-arm and table too close (occasional)
2. Calibration information incorrect or mechanical stops have moved (occasional)

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

Calibration: A/D gain control adjustment high voltage

Ensure all systems have equal input to A/D converter regardless of X-ray flux variations. Potentiometer location depends on system configuration.

Ranked causes

1. X-ray flux variation causing unequal A/D converter input (common)
2. A/D signal level out of specification after verification check fails (occasional)

First check

Install all system covers normally in X-ray beam

Test point: System covers
Expected: All covers installed

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

Calibration: Beam alignment radiation

X-ray beam positioning adjustment using Filter Drum and Array assembly to maximize signal amplitude and ensure proper detector response

Ranked causes

1. Filter Drum misalignment (side-to-side) (common)
2. Array assembly misalignment (front-to-back) (common)

First check

Start X-Ray Survey Utility and configure settings

Test point: Utilities|Service Utilities|X-Ray Survey
Expected: Hi gain=2, Lo gain=1, X-ray mode=3, Display=Graph, Segment=Air

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

Could not write new record

System unable to write new reference curve record that was entered or edited

Ranked causes

1. Hard drive is full (common)
2. Hard drive failure or corrupted reference curve database (occasional)

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

Device time-out waiting for requested action caution

Device did not respond to message within 150ms or self-limiting command timed out in state machine

Ranked causes

1. Communication failure or device not responding (occasional)
2. State machine self-limiting command timeout or cycle overflow (occasional)

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

Scan File Record too small or too large

I/O operation error, hard drive or diskette issues during file operations

Ranked causes

1. Insufficient hard drive space (common)
2. Disk hardware problem (occasional)

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

System does not start up

Software or firmware fails to initialize after power applied

Ranked causes

1. Incompatible software configuration loaded (common)
2. Computer console not powered (occasional)

First check

Verify software version and loaded options

Test point: Discovery Main Screen - Utilities|System Configuration
Expected: Software version 12.0 or higher, options compatible with hardware

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

System fails X-ray beam alignment verification radiation

System cannot complete X-ray beam alignment verification procedure

Ranked causes

1. Aperture assembly loose hardware or excessive play (common)
2. Aperture assembly encoder belt tension incorrect (common)

First check

Realign X-ray beam and recalibrate aperture

Test point: Aperture assembly
Expected: Alignment verification passes

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

Truncated Patient Record

I/O operation error during patient record read/write, hard drive or diskette problem

Ranked causes

1. Insufficient hard drive space (common)
2. Disk hardware problem (occasional)

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

Unable to format diskette

Diskette format operation failed, likely defective diskette or hardware problem

Ranked causes

1. Defective diskette (common)
2. Diskette drive or controller board hardware problem (occasional)

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

Unable to restore scan; system disk full

Scan restoration failed due to insufficient disk space

Ranked causes

1. Hard drive full (common)
2. Hard drive problem (occasional)

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

Vertical stripe in display image radiation

Thin vertical line or band visible in X-ray image on display, usually full screen height

Ranked causes

1. Bad detector or detector signal dropout (common)
2. Foreign matter (metallic debris) in X-ray beam path (occasional)

First check

Check detector signal strength and noise

Test point: X-Ray Survey graphic mode
Expected: Even signal across all detectors with minimal noise speckles

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

X-ray controller not generating system timing interrupts high voltage

No A/C line frequency interrupts from X-ray controller detected for at least two consecutive system clock ticks (approximately 1/10 second)

Ranked causes

1. X-ray controller fuse on operator console is open (popped) (common)
2. Emergency stop activated (occasional)

First check

Verify X-ray controller fuse status on operator console

Test point: X-ray controller fuse
Expected: Fuse seated, not popped

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

X-ray firing order out of sequence high voltage

X-ray pulse level reading from C-arm does not match expected level for the pulsing mode

Ranked causes

1. Filter drum and X-ray generator out of sync (common)
2. X-ray filament thermal overload has tripped (occasional)

First check

Verify filter drum synchronization with A/C line

Test point: Filter drum position
Expected: Filter drum synchronized with A/C line

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

Address mismatch in response message

Communication error where response message address does not match sent message address

Ranked causes

1. Communication or software error (unknown)

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

Analysis aborted - d0 below acceptable limit radiation

X-ray detector output d0 is below zero or acceptable threshold, indicating no X-rays reaching detector

Ranked causes

1. No X-rays reaching detector or hardware failure (unknown)

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

Aperture shuttle not responding caution

Aperture shuttle not moving to commanded position or stuck during motion

Ranked causes

1. Aperture not calibrated or shuttle jammed (occasional)

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

BoundaryLine internal software error

Internal software error in BoundaryLine module during processing

Ranked causes

1. Software error (unknown)

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

C-arm laser positioning error high voltage

Laser positioning light control error or unsafe C-arm and table proximity for laser use

Ranked causes

1. Laser safety distance violation or local control conflict (occasional)

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

C-arm unable to position within specified tolerance caution

Aperture mechanism has problem; C-arm cannot position device to required accuracy

Ranked causes

1. Problem with aperture mechanism (common)

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

C-arm X-ray cannot turn on radiation

Unable to turn on X-rays; filter drum not locked or 30-second startup delay not elapsed

Ranked causes

1. Filter drum not synchronized or X-ray delay not elapsed (common)

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

Calibration: Aperture

Locate exact starting positions and center of each aperture (slit) in motor steps using SQDRIVER program

Ranked causes

1. Aperture positions require initialization after alignment or maintenance (common)

First check

Center the table

Test point: Table position
Expected: Table centered in Center Table position

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

Calibration: Array area and BMC measurements

Discovery QDR requires recalibration of area and bone mineral content (BMC) measurements in array scan modes after thickness measurement calibration. Involves phantom scans, software analysis, and calibration file updates.

Ranked causes

1. Array mode calibration parameters need updating after thickness calibration (common)

First check

Restart software and center table

Test point: Discovery Main Menu
Expected: Software in service mode, table centered

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

Calibration: Array scan thickness measurement and calibration (A and SL models) radiation

Establish baseline array scan thickness indicators for spine phantom AP/Lateral scans for accurate BMD/BMC measurements

Ranked causes

1. Warm-up time insufficient or system not at thermal equilibrium (common)

First check

Select spine phantom for AP/Lateral exam setup

Test point: QDR For Windows Perform Exam
Expected: Spine phantom shipped with machine selected (Spine Phantom #nnn format in database)
Tools: Discovery software

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

Calibration: Array scan thickness measurement and calibration (C and W models) radiation

Establish baseline array scan thickness indicators for spine phantom scans to ensure accurate BMD/BMC measurements

Ranked causes

1. Warm-up time insufficient or system not at thermal equilibrium (common)

First check

Power up system and allow warm-up

Test point: Discovery system
Expected: System fully operational for minimum 30 minutes before proceeding
Tools: Discovery QDR system

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

Calibration: Detector beam flattening radiation

Flatten X-ray beam for each scan mode and find metal edge of table using phantom reference. All covers and table mat must be in X-ray path.

Ranked causes

1. Initial setup or periodic maintenance requires detector flattening (common)

First check

Restart Discovery software in service mode

Test point: PC startup
Expected: Service mode active, Discovery Main Menu displayed

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

Calibration: Filter drum encoder alignment

Verify optical interrupter signals and measure timing between BRASS and SEGMENT signals to ensure proper filter drum encoder alignment.

Ranked causes

1. Filter drum encoder timing out of specification (occasional)

First check

Attach oscilloscope Channel 1 to SEGMENT test point

Test point: TP3 on C-Arm Interface board
Expected: Probe connected and grounded

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

Calibration: Laser positioning offset

Adjust laser crosshair alignment to correctly position C-Arm over patient anatomy to prevent improper detector flattening.

Ranked causes

1. Laser crosshair misalignment with C-Arm position (occasional)

First check

Center table and activate laser

Test point: QDR control
Expected: Laser on, table centered

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

Calibration: Motor AY caution

Calibrate AY motor encoder readback and determine left mechanical stop position using SQDRIVER MOTOR$AY command

Ranked causes

1. AY motor encoder requires calibration after replacement or maintenance (common)

First check

Loosen encoder coupling set screws if encoder was replaced

Test point: Encoder coupling on pulley shaft
Expected: Set screws loosened; encoder coupling accessible

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

Calibration: Motor encoder and position offset

Configure stepper motor direction, step distance, encoder calibration, mechanical limits and offset for arm rotation movement.

Ranked causes

1. Motor encoder calibration required during setup or maintenance (common)

First check

Verify motor_direction parameter

Test point: MOTOR_AR.PRO file motor_direction field
Expected: 0 if direction not reversed, 1 if reversed

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

Calibration: Motor TZ (Discovery A and SL only) caution

Calibrate TZ motor encoder readback and determine table pedestal motion limits using SQDRIVER MOTOR$TZ command

Ranked causes

1. TZ motor encoder requires calibration after maintenance or replacement (common)

First check

Select TZ motor device driver

Test point: CARM$$$$> prompt in SQDRIVER
Expected: MOTOR$TZ> prompt displayed after typing MOTOR$TZ

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

Calibration: Recalculate and add array AP scans to QC database

After area and BMC calibration complete, AP scans must be recalculated using new calibration factors and added to QC database. Includes QC plot verification to ensure measurement drift is within limits.

Ranked causes

1. QC database requires updated scans after calibration (common)

First check

Recalculate scans to new calibration

Test point: Auto Analyze RECALYZE function
Expected: 20 scans recalculated with new factors

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

Cannot generate bad detector map

System cannot create detector map because too many detectors are identified as bad

Ranked causes

1. One or more detectors are bad (common)

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

Cannot obtain results of scan

System unable to obtain results of previously scanned image that was selected for normals plotting

Ranked causes

1. Software error retrieving scan results (unknown)

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

Cannot open window

System unable to open required application window, preventing operation

Ranked causes

1. Non-Hologic software installed on computer (common)

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

Centerline angle out of tolerance during spine phantom alignment radiation

After analyzing AP scan, centerline angle is not within +2 degrees as verified at bottom of screen

Ranked causes

1. Phantom not properly aligned to laser during setup (common)

First check

Verify phantom laser alignment

Test point: Phantom centerline
Expected: Laser dot centered on phantom target, sides parallel to table
Tools: Laser, ruler

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

Console does not power up

Computer monitor or console equipment does not turn on

Ranked causes

1. Console power strip de-energized or unplugged (common)

First check

Verify power strip outlet is energized

Test point: Computer console power strip outlet
Expected: Voltage present at all outlets (120 V AC)

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

Corrupted scan data detected

Scan data has been corrupted and cannot be used reliably

Ranked causes

1. Data corruption during scan (unknown)

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

Could not find file extension

System unable to locate required file extension

Ranked causes

1. Software error (unknown)

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

Database file error

Database file access error with error code and file information

Ranked causes

1. Database error (unknown)

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

Device already in use by foreground task

MAPI driver already opened by another application preventing exclusive access

Ranked causes

1. MAPI driver already in use (occasional)

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

Device has not been configured

Invalid motor calibration data sent to driver with one or more parameters less than or equal to zero

Ranked causes

1. Invalid motor calibration parameters (occasional)

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

Device in emulation mode

Device driver reports device is in emulation mode, not an error condition

Ranked causes

1. Emulation enabled by design or configuration (common)

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

Device not ready to perform requested action

State machine not ready to execute because necessary data structures not yet downloaded

Ranked causes

1. Program or task table not downloaded (occasional)

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

Device state machine error

Attempted to load, execute or abort state machine while one was already running or while devices were executing commands

Ranked causes

1. State machine conflict or protocol issue (unknown)

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

Drum bearings require replacement caution

Inner or outer drum bearings (250-0045 or 250-0046) show wear, noise, or binding.

Ranked causes

1. Bearing wear or degradation (occasional)

First check

Remove aperture assembly

Test point: Aperture assembly mounting
Expected: Aperture assembly removed

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

More symptoms

Drum belts require replacement or adjustment
DXA quality control phantom segment rotation and positioning
EMI cable replacement and grounding
Motor not ready for commands
Motor parameter modification during motion
No files available to restore from optical
No records in Normals Curve database
Oil leak from tank assembly
Oil leakage from tank assembly
Phantom value discrepancy during QC verification
Stepper motor assembly requires replacement
Test failed - absolute max or min limit exceeded
Test failed - maximum SD exceeded
Test failed - mean exceeds limits
Test: Lateral alignment (QDR 4500A and SL models)
TZ motor service mode conflict
Unable to determine power line frequency
Unable to find file
Unable to open a window
Unable to Write to Q-Image File
Unexpected message from remote device [E_UNEXPECTED_RESPONSE_I]
Unrecognized device command [E_UNKNOWN_COMMAND_I]
Unsolicited message from C/C [E_UNSOLICITED_MESSAGE_I]
X-ray controller not generating A/C line interrupts - DAS [E_NO_TIMER_INTERRUPT_I]
X-ray signal level (hi/lo) mismatch with filter drum position

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

Error codes

Code	Meaning	Trigger	Severity
`A-15 State`	Device returned unrecognized response to fast query from C-arm microprocessor	C-arm microprocessor returns unrecognized response to fast query	error
`device: Unable To Allocate Resources`	Software unable to allocate requested system resources	Memory or resource allocation during operation	error
`device: Unrecognized Command Code`	Device received unrecognized or invalid command code	Device command transmission	error
`E_ADDRESS_MISMATCH_I`	Address in response message did not match address in sent message	Communication error during message exchange	error
`E_BAD_BLOCK_I`	Checksum calculated by C/C does not match checksum in message packet	Message transmission or storage error	critical
`E_CANCELED_I`	Message packet canceled before response received	Message packet canceled before response arrives	info
`E_COLLISION_IMMINENT_I`	C-arm and table are within 1/4 inch of each other	C-arm and table position within unsafe distance	warning
`E_COLLISION_STOP_I`	Motor power shut off due to arm and table collision	Arm and table collide during motion	critical
`E_EMERGENCY_STOP_I`	Emergency stop active	Emergency stop button pressed; emergency stop strip touched; C-arm and table within 1/10" of each other	critical
`E_EMULATE_I`	Device is in emulation mode	Device driver internal state report	info
`E_INTERLOCK_INHIBIT_I`	X-ray controller is not generating system timing interrupts	At least two consecutive system clock ticks without A/C line frequency interrupts from X-ray controller	error
`E_INTERNAL_ERROR_I`	Internal driver error	Multiple conditions: ON_LINE command; XRAY_ON_PHASE/XRAY_SEQUENCE/PULSE_PER_SEG command; C-arm device status; abort code for state machine	error
`E_INVALID_ADDR_I`	Invalid address for message packet	Invalid address provided in message packet	error
`E_INVALID_FLAT_DATA_S`	Invalid flattening data	Flattening data validation failure	error
`E_INVALID_MODE_I`	Invalid mode for device driver	Application attempts to change X-ray mode when X-rays already on	error
`E_INVALID_PARAM_I`	Invalid parameter value associated with device command	Parameter value out of range for device command	error
`E_INVALID_SIZE_I`	Response to fast query below minimum length	C-arm response to fast query does not have minimum length	error
`E_LIMIT_POSITION_I`	Motor attempted to move beyond limit position	Application attempted to move motor beyond limit position	error
`E_LOCAL_MOTION_I`	Local motion enabled/disabled while motors still moving	Application attempts to enable or disable local motion when motors moving; protocol abort to start local motion state machine	warning
`E_LOCKOUT_I`	Device already in use by foreground task	MAPI driver opened by another application when exclusive access required	error
`E_MISSED_INTERRUPT_I`	Driver missed a hardware interrupt	Mismatch in message sequence field from C-arm microprocessor	error
`E_MOTION_REVERSED_I`	Motor direction reversed during stepping	Motor direction check every 3 seconds shows incorrect direction	error
`E_NAK_I`	Remote device did not echo command	First byte in message response does not match command character	error
`E_NO_MOTION_I`	No motion detected while motor stepping	Motor commanded to move but no motion detected by motion detector	error
`E_NOT_CONFIGURED_I`	Device has not been configured with valid calibration data	Invalid motor calibration parameters sent to driver	error
`E_NOT_INSTALLED_I`	Driver is not installed	Response to ON_LINE command	error
`E_NOT_READY_I`	Device not ready to perform requested action	State machine attempted to execute before necessary data structures downloaded	error
`E_OFF_LINE_I`	Driver is off line	Any command written to driver when system is OFF_LINE	warning
`E_OPERATOR_I`	Operator terminated action	Operator cancels operation	info
`E_QUEUE_FULL_I`	Internal device request queue full	Common buffer area for system sounds is full	warning
`E_SENT_I`	Message sent but response not yet received	Fast query response not received before next cycle	warning
`E_STACK_ERROR_I`	Internal stack error	Local stack for task overflowed or underflowed	error
`E_TIME_OUT_I`	Device time-out waiting for requested action	Message response not received within 150ms or state machine command timeout	critical
`E_TOO_LONG_I`	Parameter size too large for driver or response overflowed buffers	State machine reference beyond limits or message response overflowed internal buffers	error
`E_WAITING_I`	Message packet queued but not yet sent to C-arm	Message queued in MAPI buffers but not sent before next A/C line cycle	warning
`E_WORKSTATION_BOOT_I`	No A/C line interrupts detected at startup	System fails to detect A/C line interrupts during boot	error
`E_XRAY_PHASE_I`	X-ray signal level (hi/lo) did not match filter drum position	Filter drum monitor enabled and filter drum on; filter drum wheel readback does not match expected value	error
`E_XRAY_SEQUENCE_I`	X-ray firing order is out of sequence	X-ray pulse level reading from C-arm does not match expected level template for given X-ray pulsing mode	error
`Invalid serial number in ARRC.TXT`	Serial number in ARRC.TXT file is invalid	Machine reads ARRC.TXT file with invalid serial number	warning
`Invalid serial number in environ.bat file`	Machine serial number in environ.bat is not valid	Invalid serial number found in environ.bat during startup	error
`Invalid values in bad detector map`	Detector map contains invalid values	Bad detector map found during initialization or hardware check	error
`I/O Error`	Error reading or writing to disk drive	Disk read or write operation fails	error
`Limit Exceeded`	System parameter or resource limit exceeded	Operation attempts to exceed defined limit	warning
`Machine serial number is not valid`	QDR 4500 ID file C:\SQUID.DAT is invalid	System reads invalid QDR 4500 ID file	error
`Machine type in configuration files is inconsistent`	Configuration files contain inconsistent machine type	Machine type mismatch detected in configuration files	error
`Machine type is not valid`	Machine type is not valid	Invalid machine type detected during startup or operation	error
`Memory allocation error`	System unable to allocate required memory	Memory allocation request fails	error
`Missing ARRC.TXT file`	ARRC.TXT file not found in C:\XCDATA	System unable to locate ARRC.TXT during initialization	error
`Missing tissue bar initialization file`	Tissue bar calibration file missing or not installed	System unable to find or load tissue bar calibration file	error
`MOTOR$TZ`	Pedestal timeout during TZ motor move command	TZ firmware reports timeout during move command	error
`MOTOR$xx`	Motor position increments do not match motion parameters	Position checks every 3 seconds show incremental positions not matching motion parameters within ~50%	warning
`Motor_xx`	Motor attempted to reverse direction while moving	Application attempted to move stepper motor in opposite direction to current motion	error
`No data for attenuation curves`	Attenuation curve data missing or unavailable	System unable to access or load attenuation curves	error
`Not enough memory`	Insufficient system memory for operation	System cannot allocate required memory for operation	error
`Old Whole Body Context Type`	Obsolete whole body context type detected	System detects old or incompatible context type	warning
`Out of memory`	System memory exhausted	Memory allocation fails due to insufficient available memory	error
`Overflow calculating flattening or daily factors`	Overflow error during flattening or daily factor calculation	Calculation exceeds maximum value	error
`Patient File Record __ Too Large`	Patient file record too large for storage	I/O operation to patient file fails due to record size exceeding limits	error
`Patient File Record __ Too Small`	Patient file record too small for data	I/O operation to patient file fails due to insufficient space	error
`PGLINE`	Software error at specific line in PGLINE	Undefined software error in PGLINE code	error
`ROI Limit Error`	Region of interest processing limit exceeded	ROI operation during scan analysis	error
`Scan File Record __ Too Large (__)`	Scan file record size larger than expected	I/O operation to hard drive, diskette or optical media	error
`Scan File Record __ Too Small (__)`	Scan file record size smaller than expected	I/O operation to hard drive, diskette or optical media	error
`Scan has 0 points or lines`	Scan contains no measurement data points or lines	Scan data validation after acquisition	error
`Software Error .......`	Generic unspecified software error	Various software execution errors	error
`Starting phase Out of Range`	Scan initialization phase parameter outside acceptable range	Scan startup phase calculation	error
`Test failed - absolute max or min limit exceeded`	Detector output exceeds maximum or minimum limit	Detector self-test during hardware check	error
`Test failed - maximum SD exceeded`	Detector standard deviation exceeds limit	Detector uniformity self-test	error
`Test failed - mean exceeds limits`	Mean detector output exceeds acceptable limits	Detector output self-test	error
`The analyze data file either did not exist or did not contai`	Required ANALYZE.DAT file missing or corrupted	Software initialization or calibration file load	error
`There are no files available to restore (Optical restore)`	No scans in selected optical archive	Optical restore operation from archive with no scans	warning
`There are no records in the Normals Curve database.`	Reference curve database is completely empty	Software startup or calibration lookup	error
`The X-ray controller is not generating A/C line interrupts [`	Motor & Drive board not producing required 60Hz (or 50Hz) interrupts	Motor control board self-test or during DAS synchronization	error
`Truncated Patient Record ...`	Patient record file incomplete or corrupted	I/O operation during patient record read/write	error
`Unable to Allocate Space for Environment`	Software unable to allocate memory for environment variables	Software startup or environment initialization	error
`Unable to Calculate Line-By-Line d0's`	Software unable to compute line-by-line calibration factors	Calibration data processing	error
`Unable to determine power line frequency`	C-Arm unable to measure AC line frequency interval	Frequency detection during system startup or check	error
`Unable to find file`	File not found during file operation	File read or access attempt	error
`Unable to Find Line by Line d0's`	Line-by-line calibration factor file not found	Calibration file access during operation	error
`Unable to Find Previous Analysis Results`	Saved analysis results file not found	Retrieval of stored analysis data	error
`Unable to format diskette`	Diskette format operation failed	User-initiated diskette format or automatic format	warning
`Unable to normalize line sums`	Software unable to normalize detector line sum data	Detector data normalization processing	error
`Unable to open a window`	Display window cannot be opened	Window creation during software operation	error
`Unable to open temporary file ________`	Temporary work file cannot be created or opened	Temporary file creation during operation	error
`Unable to open temporary Q-File`	Temporary Q-File cannot be created or opened	Q-data temporary file creation	error
`Unable to Open Tissue Calibration File ________`	Tissue calibration file cannot be opened	Tissue calibration file access	error
`Unable to Position Data File`	Data file pointer positioning failed	Data file seek operation	error
`Unable to position device within specified tolerance [E_TOLE`	Device failed to reach target position within tolerance limits	Motor positioning during table or aperture movement	error
`Unable to Position File: ________`	File pointer positioning failed	File seek operation	error
`Unable to Position File to HALO Record`	File pointer cannot be positioned to HALO record	HALO data file positioning	error
`Unable to Position Patient File`	Patient file pointer positioning failed	Patient file seek operation	error
`Unable to Position Patient File Past Record __`	Patient file pointer cannot move past specified record	Patient file seek past record	error
`Unable to Position Patient File To End`	Patient file pointer cannot move to end of file	Patient file end-of-file seek	error
`Unable to Position Q-Data File`	Q-Data file pointer positioning failed	Q-Data file seek operation	error
`Unable to Position Scan File Past Record __ (__)`	Scan file pointer cannot move past specified record	Scan file seek operation	error
`Unable to Read BMD Image Frame`	BMD image frame data cannot be read	BMD image file read attempt	error
`Unable to Read Data File`	Data file read operation failed	Data file read attempt	error
`Unable to Read File: ________`	File read operation failed	File read attempt	error
`Unable to Read HALO Frame Header`	HALO frame header cannot be read	HALO frame file read attempt	error
`Unable to Read Line by Line d0's`	Line-by-line calibration factor read failed	Calibration factor file read attempt	error
`Unable to Read Previous Analysis Results`	Stored analysis results read failed	Previous results file read attempt	error
`Unable to Read Q-Data File`	Q-Data file read operation failed	Q-Data file read attempt	error
`Unable to Restore Environment`	Software unable to restore saved environment state	Software startup or system recovery	error
`Unable to restore scan. If the System Disk is full Delete Ar`	Scan restoration failed due to insufficient disk space	Scan restoration from archive or backup	error
`Unable to Rewind File: ________`	File pointer cannot be returned to start	File rewind operation	error
`Unable to Rewind Q-File`	Q-File pointer cannot be returned to start	Q-File rewind operation	error
`Unable to Write to Q-Image File`	Q-Image file write operation failed	Q-Image file write attempt	error
`Unexpected message from remote device [E_UNEXPECTED_RESPONSE`	Response from remote device does not start with expected query command character	Fast query command to remote device	error
`Unknown ROI type in DrawROI`	Unrecognized ROI type encountered during ROI drawing	ROI definition during scan analysis	error
`Unrecognized device command [E_UNKNOWN_COMMAND_I]`	Device cannot interpret received command	Device command reception	error
`Unsolicited message from C/C [E_UNSOLICITED_MESSAGE_I]`	Unexpected unsolicited message received from control system	Communication with control system	error
`X-ray controller is not generating A/C line interrupts [E_NO`	No A/C line frequency interrupts for DAS synchronization with C-arm	DAS startup or A/D conversion attempt without interrupts	error

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.