X-ray systems

Philips CRX-400: troubleshooting and error codes

The ServiceForge knowledge base holds 92 documented symptoms for the Philips CRX-400, with 210 ranked causes, 238 diagnostic checks with test points and expected values, and 17 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Anode over current fault high voltage

ANODE O.C. (DS42) LED lit on System Control Board (A7A1); ANALOG FAULT (DS16) LED also lit

Ranked causes

1. Anode Arc Fault occurring spontaneously (occasional)
2. Inverter jumper configuration incorrect (occasional)
3. X-ray tube requires seasoning (rare)
4. High voltage cable fault between inverter and multiplier (occasional)
5. X-ray tube failure (rare)
6. Anode feedback cable L8763 open circuit (occasional)
7. Anode Feedback and Buffer Board failure (rare)

First check

Determine if fault occurs spontaneously without exposure

Test point: Error logger
Expected: Check for Anode Arc Fault presence

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

Cathode over-current fault high voltage

HVG-ANA: C-0.C. error message displayed; CATHODE O.C. indicator (DS43) and ANALOG FAULT indicator (DS16) lit on System Control Board

Ranked causes

1. X-ray tube arc or cathode fault (common)
2. High voltage cable connection fault (occasional)
3. High voltage transformer secondary wiring fault (occasional)
4. X-ray tube failure (occasional)
5. Cable W11 open circuit (occasional)
6. Cathode Feedback and Buffer board jumper open (occasional)
7. Cathode Feedback and Buffer board fault (rare)

First check

Verify fault message reporting

Test point: DS43 indicator (CATHODE O.C.) on System Control Board A7
Expected: Indicator lit

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

Frequency maximum fault high voltage

System triggers frequency maximum fault condition

Ranked causes

1. Low input voltage (480 VAC below 432 VAC) (common)
2. Cable L8762 (W6/W7) disconnected or loose (occasional)
3. High preheat current (exceeds 1V/20mA) (occasional)
4. XSC+ board fault (occasional)
5. VCO pulse fault (occasional)
6. System Control Board voltage fault (occasional)
7. W2 (L7210) cable open circuit (occasional)

First check

Measure 480 VAC input supply voltage

Test point: 480 VAC supply
Expected: >=432 VAC
Tools: DMM

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

Generator cathode arc fault high voltage

ANALOG FAULT (DS16) and GENERATOR CATHODE ARC (DS46) LEDs lit on System Control Board; fault message logged

Ranked causes

1. Cable W11 (L8763) open or poor continuity (occasional)
2. System control board failure (occasional)
3. Cathode Multiplier assembly failure (occasional)
4. X-ray tube arc condition (occasional)
5. X-ray tube failure (occasional)
6. High tension cable failure (Anode or Cathode) (occasional)

First check

Verify fault occurs without exposure

Test point: Error logger
Expected: No Generator Cathode Arc Fault logged after reset

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

Interlock fault message displayed high voltage

PANEL INTLK (DS7) LED lit on System Control Board (A7), indicating interlock switch malfunction or defeat condition

Ranked causes

1. Interlock switch in defeat position (common)
2. Low voltage at JB6 pin 22 (occasional)
3. Short circuit on System Control Board at A7A1JB6-22 (occasional)
4. Open circuit on System Control Board at A7A1JB6-22 (occasional)
5. Open or short on cable L8760 (W2) (rare)
6. Open or short on cable L7209 (W3) (rare)

First check

Verify interlock fault message and LED status

Test point: DS7 LED on System Control Board (A7)
Expected: PANEL INTLK LED lit

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

Interlock fault reported high voltage

System reports interlock fault; PANEL INTLK LED (DS7) lit on System Control Board (A7)

Ranked causes

1. Interlock switch in defeat position or not properly seated (common)
2. Low voltage at JB6 pin 22 on System Control Board (occasional)
3. Short circuit on System Control Board at A7A1JB6-22 to ground (occasional)
4. Open circuit on System Control Board at A7A1JB6-22 to ground (occasional)
6. Short circuit in L8760 (W2) connector (rare)
8. Short circuit in L7209 (W3) connector (rare)

First check

Verify PANEL INTLK LED status

Test point: DS7 on System Control Board (A7)
Expected: LED lit

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

Generator anode arc fault reported radiation

GEN ANODE ARC (DS45) and ANALOG FAULT (DS16) LEDs lit on System Control Board; error logger shows Generator Anode Arc Fault message

Ranked causes

1. Cable W11 (L8763) continuity fault or connection issue (common)
2. Anode Feedback and Buffer Board logic fault (low voltage) (occasional)
3. Anode Multiplier assembly fault (high voltage) (occasional)
4. X-ray tube arc or high tension cable fault (occasional)
5. Generator internal fault or tube degradation (rare)

First check

Verify fault recurrence after system reset

Test point: Error logger
Expected: No Generator Anode Arc Fault message

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

Interlock fault message reported high voltage

PANEL INTLK (DS7) LED lit on System Control Board (A7) indicating interlock switch failure or defeat condition.

Ranked causes

1. Interlock switch in defeat position or pulled out (common)
2. Low voltage at JB6 pin 22 on System Control Board (occasional)
3. Short circuit on System Control Board at A7A1JB6-22 (rare)
4. Open circuit in cable W2 (L8760) between Inverter and Control Chassis (occasional)
5. Open circuit in cable W3 (L7209) between System Control and A.C. Input Chassis (occasional)

First check

Verify PANEL INTLK (DS7) LED status

Test point: LED DS7 on System Control Board (A7)
Expected: Lit

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

Inverter power fault in filament output module high voltage

High-voltage X-ray filament inverter module power failure with diagnostic LED indicators

Ranked causes

1. Cable W8 connection issue (common)
2. Fuse defect (occasional)
3. Voltage supply issue (occasional)
4. Cable malfunction (occasional)
5. AC diagnostic board voltage issue (rare)

First check

Verify LED status

Test point: FDBK (DS6) on Filament Power Control PCB and FIL FAULT (DS5) on System Control Board

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

Tube anode arc fault reported high voltage

System reports anode arc fault; TUBE ANODE ARC LED (DS39) and ANALOG FAULT LED (DS16) lit on System Control Board

Ranked causes

1. Cable W11 (L8763) open or poor continuity (occasional)
2. Anode Feedback and Buffer Board fault at pin 8 of A1A2J2 (occasional)
3. X-ray tube arc condition (common)
4. High tension cables W7 (L8762) or W6 (L8762) defective (occasional)
5. X-ray tube failure (rare)

First check

Measure continuity of cable W11 (L8763)

Test point: Pin 8 end to pin 8 other end of W11
Expected: less than 1 ohm, <1

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

Tube cathode arc fault reported radiation

System reports tube cathode arc fault; TUBE CATHODE ARC LED (DS44) and ANALOG FAULT LED (DS16) lit on System Control Board (A7A1)

Ranked causes

1. Cathode arc occurring during exposure (common)
2. Cable W11 (L8763) continuity fault (occasional)
3. Anode feedback signal loss (pin 8 A1A2J2 out of range) (occasional)
4. Anode or cathode high tension cable failure (occasional)
5. X-ray tube internal fault (rare)

First check

Determine if fault occurs without exposure

Test point: Error logger
Expected: No anode arc fault when no exposure is made

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

+15V supply missing in inverter high voltage

No +15V switched supply to inverter chassis; LED DS8 (LCL PWR) lit on System Control Board

Ranked causes

1. Cable W2 (L7210) or W3 (L7209) disconnected or short circuit (common)
2. Anode Multiplier connection issue (occasional)
3. Cathode Multiplier connection issue (occasional)
4. Inverter Module #1, #2, or #3 short or disconnected (occasional)

First check

Verify fault message and check LCL PWR LED status

Test point: LED DS8 on System Control Board
Expected: DS8 lit confirms +15V supply missing

12 more checks with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

Anode over voltage fault high voltage

ANODE OVP (DS40) LED lit on System Control Board (A7A1); fault message reported

Ranked causes

1. Anode arc fault occurring without exposure (occasional)
2. Anode voltage feedback signal exceeds 8.6 volts (86 kV) (common)
3. Cable W11 (L8763) open or high resistance between feedback board connectors (occasional)
4. Anode Feedback and Buffer Board (A1A2) voltage fault at JB2-25 (rare)

First check

Verify fault message and LED status

Test point: ANODE OVP (DS40) on System Control Board (A7A1)
Expected: LED lit

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

Bias voltage fault in AC chassis high voltage

Bias fault message displayed; BIAS VOLTAGE LED (DS10) lit on AC Diagnostics Board indicating power supply bias voltage failure in AC input chassis

Ranked causes

1. Cable L7209 short circuit or open connection (common)
2. Cable L7210/L8760 connection or short to inverter chassis (occasional)
3. Supply fault in AC chassis power distribution (occasional)
4. Local power fault in filament module (occasional)

First check

Verify proper fault reporting; check status of LEDs

Test point: AC Diagnostics Board A5A3A2 LED DS10 and System Control Board A7A1 LED DS4
Expected: DS10 lit (BIAS VOLTAGE); DS4 lit (AC FAULT); DS12 not lit (+/-24V UNSW OFF)
Tools: Visual inspection, multimeter

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

Cathode over-voltage fault message high voltage

CATHODE OVP LED (DS41) lit on System Control Board (A7); error logger reports cathode over-voltage

Ranked causes

1. Voltage regulation error at TP13 (common)
2. Cathode kV feedback (CAKVFB) signal not tracking output voltage (common)
3. Cable W11 (L8763) open or short circuit (occasional)
4. Cathode Feedback and Buffer PWB fault (occasional)

First check

Verify fault occurs without exposure

Test point: Error logger
Expected: Cathode Over-voltage fault logged after reset without exposure

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

Filament short detected high voltage

Fault message displayed with LCL PWR/TEST indicator lit on Filament Power PCB and FIL FAULT indicator lit on System Control Board

Ranked causes

1. Cathode HV module malfunction (common)
2. XSC board malfunction (occasional)
3. System Control board malfunction (occasional)
4. Punctured X-ray tube insert (rare)

First check

Check FIL PROG signal voltage

Test point: A4A2JB2 pins 25 and 26
Expected: voltage level compared to 1 VDC threshold
Tools: DMM

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

Generator cathode arc fault reported radiation

ANALOG FAULT (DS16) and GENERATOR CATHODE ARC (DS46) LEDs lit on System Control Board; error logger shows Generator Cathode Arc Fault message

Ranked causes

1. Cable W11 (L8763) continuity failure or connector issues (common)
2. System control board failure (occasional)
3. Cathode Multiplier assembly failure (occasional)
4. X-ray tube arc or high tension cable issue (occasional)

First check

Verify fault occurs when no exposure is made

Test point: Error logger
Expected: No Generator Cathode Arc Fault present after reset

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

Local power fault in filament module high voltage

System detects and reports local power fault in filament module power supply. Multiple LED status indicators show fault condition.

Ranked causes

1. Supply fault in power unit (HVG-SYS, HVG-INV1 bias, HVG-ACIN) (common)
2. Open circuit in filament power control board harness (A4A2JB2 to A7A1JB4) (occasional)
3. Open circuit on system control board internal connections (A7A1JB3 to A7A1JB4) (occasional)
4. Open circuit in filament control cable W2 (L7210) (occasional)

First check

Check LED status indicators for power fault confirmation

Test point: +15 UNSW (DS2) on AC input chassis (A5); +15 UNSW (DS1) on system control board (A&); +15V UNSW (DS1) on filament power
Expected: LED indicators lit showing power fault condition

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

Rail short fault in AC chassis high voltage

Overcurrent fault detected in AC power distribution chassis; system reports RAIL SHORT fault on AC Diagnostics PWB and AC FAULT on System Control Board

Ranked causes

1. Open circuit or short circuit in AC power cable W9 (common)
2. Short or open circuit in Inverter #1 power distribution (common)
3. Short or open circuit in Inverter #2 power distribution (common)
4. Short or open circuit in Inverter #3 power distribution (common)

First check

Verify fault reporting

Test point: RAIL SHORT LED (DS4) on AC Diagnostics PWB (A5A3A2) and AC FAULT LED (DS4) on System Control Board (A7)
Expected: Both LEDs lit

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

AC input fuse blown high voltage

Unit will not power on; fuse appears darkened or open when removed; 480VAC power not reaching internal circuits

Ranked causes

1. Input overcurrent event (common)
2. Shorted input load in unit (occasional)
3. Chronically undersized or failing fuse (rare)

First check

Inspect fuse cartridge or element visually

Test point: AC input fuse on power input board
Expected: Fuse element intact and not darkened/discolored; wire or element unbroken

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

AC input missing phase C high voltage

System detects missing phase C in AC power input

Ranked causes

1. Bad fuse in AC input circuit (unknown)
2. Slip rings defective or worn (unknown)
3. AC input connector or wiring fault (unknown)

Actual Length of Exposure error reported radiation

ALE error logged to Error Logger during X-ray exposure

Ranked causes

1. ALE signal fault on XSC+ PCB (common)
2. ALE signal fault on High Voltage Generator (common)
3. ALE signal fault on System Control Board (occasional)

First check

Check Error Logger for ALE fault presence

Test point: Error Logger
Expected: No ALE faults present

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

AKVFDBK and CKVFDBK voltage at fault time radiation

Anode kilovoltage feedback (AKVFDBK) or C-arm kilovoltage feedback (CKVFDBK) voltages measured after EXGATE goes low at end of exposure

Ranked causes

1. System Control board defective; both voltages zero at fault (common)
2. Defective multiplier (one feedback voltage non-zero) (common)
3. Low discharge-current X-ray tube (Z-beam); both voltages non-zero (occasional)

First check

Measure AKVFDBK at A7A1-TP15 after EXGATE goes low

Test point: A7A1-TP15
Expected: Well below 1.5 VDC before ALE Blanking goes HIGH
Tools: Digital multimeter, oscilloscope for timing observation

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

Cathode multiplier over current high voltage

Fault message appears; CATHODE MULT O.C. indicator (DS20) on System Control Board (A7) is active

Ranked causes

1. Cathode Multiplier assembly failure (common)
2. Cable W11 (L8763) continuity failure (occasional)
3. System Control PW board failure (rare)

First check

Verify fault occurs only during exposure

Test point: CATHODE MULT O.C. indicator (DS20)
Expected: Indicator off when no exposure is made

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

Cathode multiplier over current fault high voltage

Fault message reported; CATHODE MULT O.C. indicator (DS20) on System Control Board (A7) illuminates

Ranked causes

1. Cathode Multiplier assembly failure (common)
2. Cable W11 (L8763) continuity loss or damage (occasional)
3. System Control PW board failure (rare)

First check

Verify fault message is reported correctly

Test point: CATHODE MULT O.C. indicator (DS20) on System Control Board (A7)
Expected: Indicator illuminated when fault occurs

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

Error: Cathode multiplier over current (E-CMOC) high voltage

System reports cathode multiplier overcurrent condition via DS20 indicator

Ranked causes

1. Defective Cathode Multiplier module (common)
2. Defective cable L8763 between control board and multiplier (occasional)
3. System Control board (A7) failure (rare)

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

Filament rail fault displayed radiation

LED DS7 (FIL RAIL FAULT) illuminated on AC Diag PWB; AC FAULT LED DS4 may illuminate on System Control Board indicating X-ray tube filament power or control fault

Ranked causes

1. Three-phase supply voltage too low (common)
2. Filament power board indicator or circuitry fault (occasional)
3. F3 or F4 fuse open (occasional)

First check

Measure three-phase voltage at fuse holder

Expected: 432 VAC minimum (480 VAC nominal), minimum
Tools: DMM AC voltage

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

Frequency minimum fault reported high voltage

FMIN LED (DS13) lit on System Control Board (A7) indicates frequency minimum fault condition

Ranked causes

1. SW1 (7-10) switch incorrectly positioned (common)
2. Inverter enable signals incorrect (occasional)
3. XSC board failure (rare)

First check

Verify SW1 switch position

Test point: SW1 (7-10) on System Control Board
Expected: CLOSED/ON position

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

Generator cathode arc fault recurs high voltage

Fault message persists or reappears in error logger during normal operation after initial reset

Ranked causes

1. Tube arc condition (common)
2. X-ray tube degradation or failure (occasional)
3. High tension cable degradation (rare)

First check

Perform exposure at reduced protocol settings

Test point: ELTP settings
Expected: No fault recurrence in error logger

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

Negative bias fault reported high voltage

System reports negative bias error; check status of NEG BIAS 1, 2, 3 indicators on System Control Bd (A7)

Ranked causes

1. Defective inverter module voltage supplies (unknown)
2. Jumper JP2C defective or disconnected (unknown)
3. Defective ribbon cable connection (unknown)

First check

Verify fault message proper reporting

Test point: NEG BIAS 1 (DS27), NEG BIAS 2 (DS29), NEG BIAS 3 (DS31) indicators
Expected: Indicators lit as appropriate

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

Phase fault in 480VAC power supply high voltage

Unit displays phase fault error; system unable to deliver therapy; AC power distribution failure detected at input

Ranked causes

1. Customer facility power is out of specification (common)
2. Blown input fuse to unit (common)
3. AC chassis internal power distribution fault (occasional)

First check

Measure three-phase AC voltage at unit input fuse holders

Test point: Fuse holders on AC power input panel
Expected: 432 VAC minimum phase-to-phase (480V ±10%/-12%), +10%/-12%

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

Regulation error high voltage

X-ray high-voltage output regulation failure; TKVFB feedback signal anomaly detected

Ranked causes

1. SEQ LED status or TKVFB signal issue (common)
2. High voltage cable integrity issue (occasional)
3. TKVFB voltage out of range (occasional)

First check

Verify SEQ LED status on System Control Board A7A1

Expected: SEQ LED illuminated

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

Shutdown fault detected high voltage

System shutdown fault signal is active. Power supply or shutdown control circuit malfunction.

Ranked causes

1. Shutdown signal voltage out of specification at test point (common)
2. Actual Length of Exposure (ALE) error or Illegal KV fault (occasional)
3. System Control Board failure (rare)

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

AC voltage on diagnostic bias power pins abnormal radiation

Voltage between pins 17 and 18 of connector JB1 on AC Diagnostic and Bias Power board (A5A2A1) measured during exposure is out of specification

Ranked causes

1. AC chassis fault (unknown)
2. AC Diagnostic Board fault (unknown)

First check

Measure voltage between A5A2A1JB1 pins 17 and 18 during exposure

Test point: A5A2A1JB1 pins 17 and 18
Expected: greater than or less than 20 VDC
Tools: DMM

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

AKVFDBK or CKVFDBK not zero at fault time high voltage

Anode or cathode kV feedback voltages remain above zero when they should be zero

Ranked causes

1. Defective multiplier (anode or cathode) (occasional)
2. Low discharge-current x-ray tube (Z-beam) (rare)

First check

Measure AKVFDBK at A7A1-TP15 after EXGATE goes low

Test point: A7A1-TP15
Expected: Well below 1.5 VDC before ALE Blanking goes high, <1.5
Tools: Voltmeter

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

Cable continuity fault between control boards

Intermittent or open connection between System Control board and XSC+ PCB

Ranked causes

1. Cable L7097 open or intermittent at A7A1JB1 (occasional)
2. Cable L7096 open or intermittent at A7A1JB2 (occasional)

First check

Test cable L7097 continuity at A7A1JB1

Test point: Cable L7097, connector A7A1JB1
Expected: Continuity confirmed across all pins
Tools: Multimeter

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

Cathode over-voltage fault reported high voltage

CATHODE OVP LED (DS41) lit on System Control Board (A7); fault message logged in error logger

Ranked causes

1. Cable W11 (L8763) open or shorted between chassis (unknown)
2. Cathode Feedback and Buffer PWB defective (unknown)

First check

Verify fault occurs only during exposure attempt or persistently

Test point: Error logger
Expected: Fault absent when no exposure is made

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

DC rail voltage imbalance high voltage

Voltages across DC rail capacitors not balanced within specification, indicating potential component failure or circuit imbalance.

Ranked causes

1. Open bleeder resistor on one rail (common)
2. Failed DC rail capacitor on one side (occasional)

First check

Measure line-to-line resistance of Main DC rail cable L8761

Test point: black to red wire
Expected: greater than 2 kilohms

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

Filament feedback fault high voltage

Filament feedback circuit fault indicated by error logger; may be accompanied by other generator faults

Ranked causes

1. XSC+ module malfunction (common)
2. Other generator faults present (occasional)

First check

Access Error Logger and check for other generator faults

Test point: Error Logger display
Expected: List of any faults present

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

Inverter interlock fault high voltage

INV INTLK indicator (DS34) lit on System Control Board (A7)

Ranked causes

1. INTLK signal low or open circuit (unknown)
2. INTLK signal high or shorted (unknown)

First check

Verify fault message reporting

Test point: INV INTLK (DS34) indicator
Expected: Lit on System Control Board (A7)

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

KV balance fault high voltage

KV BAL LED (DS18) lit on System Control Board (A7A2); system reports kV balance discrepancy between anode and cathode multipliers

Ranked causes

1. KV feedback signal difference exceeds 5% tolerance (common)
2. High Tension Transformer (HTT) output imbalance (occasional)

First check

Measure KV feedback voltage across anode multiplier feedback board

Test point: A1A2TP5
Expected: In scale with selected kV (1V per 10kV by protocol); difference <2.5% of selected kV
Tools: Oscilloscope

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

kV/mA error detected radiation

Heat calculator error indicates kV or mA measurement out of tolerance

Ranked causes

1. kV feedback out of tolerance (unknown)
2. Anode mA out of tolerance (unknown)

First check

Run sx diagnostic

Test point: Diagnostic system
Expected: Diagnostic completes without errors

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

Low voltage at JB6 pin 22 high voltage

Voltage measurement at JB6 pin 22 on System Control Board is below 1.5 volts

Ranked causes

1. Defective interlock circuit on System Control Board (common)
2. Short circuit to ground on control board (occasional)

First check

Measure voltage at JB6 pin 22

Test point: JB6 pin 22 on System Control Board
Expected: 1.5 volts or higher V
Tools: DMM

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

Multiplier capacitor discharge fault high voltage

AKVFDBK or CKVFDBK voltage remains non-zero at time of fault after exposure

Ranked causes

1. Defective multiplier (A or C kV) (occasional)
2. Low discharge-current X-ray tube (Z-beam) (rare)

First check

Measure AKVFDBK at A7A1-TP15 after EXGATE goes low at exposure end

Test point: A7A1-TP15
Expected: 0 VDC before ALE Blanking goes High

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

Overcurrent in filament chassis high voltage

O.C. LED (DS5) lit in Filament Chassis (A4A2) and FIL FAULT LED (DS5) lit in Control Chassis (A7)

Ranked causes

1. Filament Power/Control PWB Assembly voltage out of specification (common)
2. XSC board failure (occasional)

First check

Measure voltage between JB2 pin 25 and JB2-26 on Filament Power/Control PWB Assembly

Test point: JB2 pin 25 to JB2-26
Expected: 6 volts in standby V

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

Voltage out of range on AC Diagnostic and Bias Power board radiation

During exposure, voltage on pins 17 and 18 of connector JB1 (A5A2A1) measures incorrect value

Ranked causes

1. AC chassis fault (unknown)
2. AC Diagnostic Board fault (unknown)

First check

Measure voltage between pins 17 and 18 of JB1 connector on A5A2A1 board during exposure

Test point: A5A2A1JB1 pins 17 and 18
Expected: greater than 20 VDC or less than 20 VDC
Tools: DMM

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

AC input rails below 200V high voltage

System displays fault message indicating rails voltage is low, suggesting AC input or inverter malfunction

Ranked causes

1. Bad AC input (ACIN) or inverter (unknown)

ALE goes HIGH after ALE Blanking high voltage

ALE (Anode Load Enable) signal transitions high after ALE Blanking signal goes high, indicating timing violation

Ranked causes

1. ALE timing violation (unknown)

First check

Monitor ALE and ALE Blanking signals simultaneously

Test point: System control signals
Expected: ALE stays LOW while ALE Blanking is HIGH

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

Anode Multiplier Over Current fault radiation

Fault message reported; ANODE MULTIPLIER O.C. indicator (DS19) on System Control Board (A7) is active

Ranked causes

2. Cable W11 (L8763) continuity fault (occasional)

First check

Verify fault occurrence during normal operation

Test point: System operation
Expected: Fault occurs only during exposure attempts

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

Anode/Cathode Arcs fault reported radiation

Anode or Cathode arcing faults logged to Error Logger during X-ray exposure

Ranked causes

1. Anode/Cathode arcing during exposure (occasional)

First check

Check Error Logger for Anode/Cathode Arc faults

Test point: Error Logger
Expected: No arc faults present

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

Both AKVFDBK and CKVFDBK non-zero at fault time high voltage

Both anode and cathode feedback voltages elevated simultaneously when they should be zero

Ranked causes

1. Low discharge-current x-ray tube (Z-beam) (rare)

First check

Verify both AKVFDBK and CKVFDBK are non-zero

Test point: A7A1-TP15 and A7A1-TP14
Expected: Both should be zero; if both non-zero at fault time indicates possible Z-beam tube

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

Calibration: Jumper and switch settings verification

Verify correct jumper and switch configuration

Ranked causes

1. Incorrect jumper or switch settings (unknown)

First check

Verify jumper and switch settings

Test point: Jumper and switch configuration on board
Expected: Per Page 3 specifications

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

Calibration: System voltage feedback scaling radiation

Verify tube kilovoltage feedback signal scaling (1 V per 20 kV) is correctly calibrated across diagnostic test points

Ranked causes

1. Feedback scaling reference needed for troubleshooting (unknown)

First check

Verify TKVFDBK scaling factor

Test point: A7A1-TP16
Expected: 1 V = 20 kV, per 20 kV
Tools: Digital multimeter

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

Calibration: X-ray tube seasoning for cathode arc reduction radiation

Procedure to condition cathode after detecting tube arc faults during troubleshooting

Ranked causes

1. X-ray tube arc detected (common)

First check

Set reduced power protocol

Test point: ELTP settings
Expected: Lower kV and mA values configured

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

Cathode multiplier diagnostics - cable interchange procedure high voltage

Test procedure to isolate cable faults by physically interchanging anode and cathode multiplier cables to determine if error moves

Ranked causes

1. Cable routing or connector fault (occasional)

First check

Rerun exposure after cable interchange

Test point: System Control Board indicator
Expected: Error moves to anode circuit (indicates cable problem) or remains on cathode (indicates multiplier problem)

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

DC rail voltage below minimum high voltage

One or both sides of DC rail capacitor voltage falls below 200 VDC, indicating insufficient power supply output.

Ranked causes

1. Faulty AC chassis (common)

First check

Measure voltage across DC rail capacitors

Test point: DC rail caps
Expected: 200 VDC minimum on each side

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

Error persists after initial remedies high voltage

Fault continues after checking multiplier assembly and cables

Ranked causes

1. System Control PW board defective (rare)

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

Error recurs after waveform check high voltage

System repeats error condition despite correct waveforms observed

Ranked causes

1. Defective System Control board (common)

First check

Observe waveforms

Test point: System output
Expected: As specified in preceding steps

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

Error recurs despite correct waveforms high voltage

System error repeats even when voltage waveforms appear normal on oscilloscope

Ranked causes

1. System Control board defective (common)

First check

Inspect voltage waveforms on oscilloscope

Test point: System control circuit
Expected: Waveforms normal

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

Error recurs during X-ray exposure radiation

Waveforms indicate recurring system error during operation

Ranked causes

1. System Control board failure (common)

First check

Measure TKVFDBK at test point A7A1-TP16

Test point: A7A1-TP16
Expected: >30kV (1.5 V), >1.5 V

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

More symptoms

Filament circuit AC bias supply fault
High voltage feedback out of range
High Voltage Generator fault
High voltage interlock fault
High voltage on AC Diagnostic and Bias Power board during exposure
HV interlock fault reported
Illegal kV Fault error reported
KV balance fault diagnostic procedure
Line voltage sag
Line voltage sag detected
Low AC input voltage
Low DC rail voltage
Low voltage on AC Diagnostic and Bias Power board during exposure
Main DC rail cable insulation degradation
Open filament fault
Rail voltage fault
Rail voltage fault reported
RELAY FAULT
Relay fault reported
Sequence error reported
Sequence fault - missing XPREP at XGATE
Shoot thru in filament module
Shutdown indicator LED inactive when expected
System requires component replacement
Test point signal voltage abnormal
TKVFDBK voltage below 30 kV
TKVFDBK voltage exceeds 30 kV
TKVFDBK voltage out of range
Tube anode arc fault after exposure
Unit does not start up
X-ray timeout error
X-ray tube arcing

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

Error codes

Code	Meaning	Trigger	Severity
`1012`	Uncommanded X-ray exposure event	Unintended radiation emission detected	critical
`ACIN: MISSING PHASE C`	AC input phase C is missing or not detected	System power-up or phase loss during operation	error
`ACIN: RAILS <200V`	AC input rails voltage fault	AC input voltage drops below 200V	error
`ANA: CATHODE OVER VOLTAGE - BAD MULTI/CNTRL`	Cathode over-voltage condition detected; multifunction or control board suspected	High voltage at cathode filament supply exceeds safe limits	critical
`CATHODE MULT O.C.`	Cathode multiplier over current fault	Over-current condition in cathode multiplier circuit or cable	error
`CATHODE OVER VOLTAGE`	Cathode voltage has exceeded safe operating limits	Detected during X-ray tube operation or high-voltage supply monitoring	error
`FIL`	Open filament fault	Filament circuit open condition detected	error
`FIL: OPEN FILAMENT`	Filament circuit is open	X-ray tube filament connection failure or component fault	error
`FIL RAIL FAULT`	Filament rail power or control fault on X-ray tube circuit	Self-test detects fault in filament rail power or control; LED DS7 illuminates on AC Diag PWB	error
`FMIN`	Frequency minimum fault	Inverter enable signal or system control issue detected	error
`GEN ANODE ARC`	Generator anode arc fault detected	Arc detected in anode circuit or related control board fault	error
`Generator Cathode Arc Fault`	Cathode arc detected in X-ray generator circuit	Arc condition in cathode circuit or cable continuity loss	error
`HVG-ANA: C-0.C.`	Cathode over-current fault in high voltage generator analog circuit	Cathode current exceeds safe limit during X-ray generation or at generator reset	error
`HV INTERLOCK FAULT`	High voltage interlock fault detected	Open circuit detected in HV interlock wiring chain (W2 cable or multiplier assembly connections)	error
`kV/mA ERROR`	Heat calculator kV or mA measurement out of specification	Measured kV or mA exceeds tolerance limits during system operation	error
`LCL PWR: MISSING +15V - BAD INV/ACIN`	Local power missing +15 volts, inverter or AC input fault	System control board detects absence of +15V supply	critical
`PHASE FAULT`	Three-phase AC input voltage out of specification or imbalanced	Automatic detection of 480VAC phase-to-phase voltage < 432VAC or phase imbalance at unit power input	critical

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.