X-ray systems · MUX family

Shimadzu MUX-100: troubleshooting and error codes

The ServiceForge knowledge base holds 132 documented symptoms for the Shimadzu MUX-100, with 214 ranked causes, 327 diagnostic checks with test points and expected values, and 82 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

X-ray tube rotor not rotating (F61) radiation

Starter error; starter does not issue current detection confirmation signal; rotor does not rotate due to absent or low stator coil current

Ranked causes

1. Fuse F3 blown (common)
2. Stator coil current low or absent (common)
3. Low voltage cable poorly contacted (occasional)
4. INVERTER UNIT abnormal (occasional)
5. MUX CHARGE abnormal (occasional)
6. X-ray tube coil open or high resistance (occasional)
7. SW1A not set to ON (occasional)
8. X CONT or NEXSC abnormal (occasional)

First check

Check fuse F3 on MUX POWER

Test point: Fuse F3
Expected: Not blown

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

Abnormal motor movement patient safety

Arm or motor exhibits abnormal motion during operation, either unable to drive, restricted high-speed driving capability, or intermittent brake function.

Ranked causes

1. Arm catcher mechanism misalignment (common)
2. Motor malfunction (common)
3. FSR (Field Speed Regulator) malfunction (common)
4. Inch moving switch failure (occasional)
5. Operation panel light failure (occasional)
6. Photo sensor malfunction (occasional)
7. Brake intermittent function (occasional)

First check

Verify driving is possible

Test point: Motor control circuit
Expected: Unit responds to drive command

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

F12 (KV UNDER) - tube voltage low high voltage

Measured tube voltage is 50% or more below the preset value, detected by software at 20ms after exposure and at each 100ms interval

Ranked causes

1. Glow discharge occurred in X-ray tube (common)
2. High voltage transformer defective (occasional)
3. High voltage cable defective (occasional)
4. X CONT abnormal (occasional)
5. NEXSC abnormal (occasional)
6. INVERTER UNIT abnormal (occasional)

First check

Check CP9 (TKV) and CP12 (RKV) on X CONT

Test point: CP9 (TKV), CP12 (RKV)
Expected: Normal voltage

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

F12 (KV UNDER) error: tube voltage low high voltage

Measured tube voltage is 50% or more below preset value, detected by software at 20ms after exposure and every 100ms

Ranked causes

1. Glow discharge in X-ray tube (common)
3. High voltage cable defective (occasional)
4. X CONT (X-ray control unit) abnormal (occasional)
5. NEXSC unit abnormal (occasional)
7. FVR adjustment out of range (occasional)
8. KVFeedback abnormal (occasional)

First check

Measure or monitor tube voltage at control points

Test point: CP9 (TKV) and CP12 (RKV) on X CONT
Expected: Normal within specification

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

F23 NO MA zero or very low tube current high voltage

Measured tube current is approximately 10 mA or less, detected by software at 20ms after exposure and each 100ms. Filament may be broken or high voltage path interrupted.

Ranked causes

1. Short-circuit bar missing or high voltage path open (common)
2. High voltage cable not conductive or broken (common)
3. Cable JFB between transformer and X CONT broken or loose (occasional)
4. X-ray tube filament broken (rare)
5. High voltage transformer filament winding or current sensing circuit fault (occasional)
6. Fuse F3 blown or short circuit in filament path (occasional)

First check

Verify short-circuit bar on terminal block X1

Test point: Terminal block X1 on X CONT (mA+ and mA- terminals)
Expected: Short-circuit bar present and secure
Tools: Visual inspection

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

Filament current low or absent (F33) radiation

Measured filament current approximately 1 A or less, detected every 800 ms during prep or 400 ms when ready

Ranked causes

1. High voltage cable poorly contacted (common)
2. INVERTER UNIT abnormal (occasional)
3. X CONT abnormal (occasional)
4. X-ray tube filament broken (occasional)
5. High voltage transformer defective (rare)

First check

Verify C0 and CL waveforms normal

Test point: X CONT display
Expected: Normal waveforms

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

Battery voltage out of range (F51, F52, F54, F55, F56, F5b) high voltage

Battery voltage abnormal during charging: too high (>155V), too low (<100V), or imbalanced between plus and minus sides (>15% difference)

Ranked causes

1. Battery voltage out of specification (common)
2. MUX CHARGE unit abnormal (occasional)
3. Voltage detection circuit out of adjustment (occasional)
4. X CONT 2000 abnormal (occasional)

First check

Check battery voltage at TER1-TER5

Test point: Battery terminals TER1-TER5
Expected: 100-155V, -55V to 0V (min 100V)

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

d1 error - Motor drawing excessive current

Drive motor exceeds 6A for more than 10 seconds; warning prevents Mobile Art travel

Ranked causes

1. DC motor brush wear with residual powder shorting rotor (common)
2. Left motor defective and drawing excessive current (common)
3. Right motor defective and drawing excessive current (common)
4. MU Driver PCB defective (occasional)

First check

Measure left motor current draw at CP9 on MU Driver PCB

Test point: CP9
Expected: Less than 3.5V (less than 6A), below threshold
Tools: DMM

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

d1 warning error displayed

Warning error message d1 appears briefly on panel display and is logged in system error log. Indicates one of the DC drive motors is drawing excessive current.

Ranked causes

1. DC motor brush wear and powder accumulation on positive electrode (common)
2. Left drive motor failure (occasional)
3. Right drive motor failure (occasional)
4. MU Driver PCB failure (rare)

First check

Measure left motor current draw at test point

Test point: CP9 on MU Driver PCB
Expected: Less than 3.5V (corresponds to less than 6A current draw); 2.5VDC offset, every 0.1V = 0.67A
Tools: DMM

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

F01/F02 supply voltage out of range high voltage

Power supply voltage is abnormal, either approximately 20% high (F01) or 30% low (F02), detected by software.

Ranked causes

1. Input voltage exceeds tolerance (F01) or falls below tolerance (F02) (common)
2. Transformer T1 primary winding open or power line fault (occasional)
3. MUX CHARGE 99 board malfunction (occasional)
4. X CONT or NEXSC board malfunction (occasional)

First check

Measure CP23 (LV) on X CONT board

Test point: CP23 on X CONT-2000
Expected: Within range 2V+20%~-30% (nominal ~2V), +20% to -30%
Tools: Multimeter

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

Noise during unit movement and driving

Noise created during unit movement along the column, arm forward/backward movement, and arm lock operation

Ranked causes

1. Worn or misaligned brake for column up/down movement (common)
2. Noise in upper column section (occasional)
3. Noise in arm forward/backward movement (occasional)
4. Noise in arm lock section (occasional)

First check

Remove arm cover

Test point: Arm cover fasteners
Expected: Cover removed cleanly

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

Unit generates excessive driving noise during movement

Noise occurs when the unit moves (column up/down, arm forward/backward, or arm lock operation)

Ranked causes

1. Brake for column up/down movement requires modification (common)
2. Upper column section requires noise countermeasures (common)
3. Arm forward/backward movement section requires noise countermeasures (common)
4. Arm lock section requires noise countermeasures (common)

First check

Remove arm cover

Test point: Arm assembly
Expected: Cover removed without damage

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

Battery charging behavior differs by EMC standard compliance

System charge control behavior varies based on EMC Standard edition (First vs Second) and software version, affecting when battery charging is possible relative to Key Switch position

Ranked causes

1. Software version mismatch with EMC standard compliance level (common)
2. NEXSC DIPSW2-6 setting incorrect for installed software version (occasional)
3. Battery charge prevented due to Key Switch position incompatibility (common)

First check

Determine installed software version

Test point: System firmware version display
Expected: V1.50 (Second Edition only), V1.52 or later (both editions), or earlier than V1.50 (First Edition only)

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

Error F55 displayed during battery charging

Unit displays error code F55 indicating battery charged voltage of + side is more than 12V higher than – side; error appears during charging and when charging stops

Ranked causes

1. One battery block has significantly higher voltage than others (common)
2. Defective battery with excessive voltage drop (common)
3. Software version incompatibility (occasional)

First check

Measure charged voltage of battery block BAT1

Test point: BAT1
Expected: Voltage approximately equal to BAT2, BAT3, BAT4

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

Exposure control circuit abnormal (F6F) radiation

KVT (kV rising signal) not returned within 250 ms after EXR sent; phototiming shutdown signal IPOF detected simultaneously with EXR, or setting error if phototimer not provided

Ranked causes

1. Phototiming conflict during exposure (occasional)
2. Incorrect initial settings without phototimer (occasional)
3. X CONT-2000 PCB abnormal (occasional)

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

F12 KV under voltage radiation

Measured tube voltage is lower by 50% or more than preset value, detected by software at 20ms after exposure and each 100ms. Glow discharge likely in X-ray tube.

Ranked causes

1. X-ray tube glow discharge or filament circuit fault (common)
2. X-ray tube filament broken (rare)
3. High voltage transformer or cable defective (occasional)

First check

Measure CP9 (TKV) and CP12 (RKV) on X CONT

Test point: Test points CP9 (TKV) and CP12 (RKV) on X CONT
Expected: Both normal or RKV abnormal
Tools: Multimeter

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

F13 NO KV zero or very low voltage high voltage

Measured tube voltage is approximately 10 kV or less, detected by software at 20ms after exposure and each 100ms.

Ranked causes

1. INVERTER UNIT fuse blown or IGBT damaged (common)
2. Tube voltage feedback or control circuit fault (occasional)
3. High voltage transformer defective (rare)

First check

Verify fuse on INVERTER UNIT

Test point: Fuse location on INVERTER UNIT
Expected: Fuse intact and conductive
Tools: Visual inspection, continuity meter

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

Switch stuck ON at power-on (D4-D11) patient safety

Any control switch detected as ON during power-up; D4 brake release, D5-D6 small movement forward/backward, D7-D8 drive handle left/right, D9 bumper, D10-D11 arm lock release switch and lever

Ranked causes

1. Switch stuck or jammed (common)
2. Electrical connection fault (common)
3. MUX DRIVE logic fault (occasional)

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

System veers left or right, difficult to drive straight patient safety

Unit drifts consistently in one direction despite operator input; no error messages displayed; symptom occurs with either open F4 or F5 fuses

Ranked causes

1. Fuse F4 (+120V) open (common)
2. Fuse F5 (-120V) open (common)
3. Shorted FETs Q6, Q7, Q8, Q9 on MU Driver board (occasional)

First check

Measure resistance across source and drain of FETs Q6, Q7, Q8, Q9

Test point: Q6, Q7, Q8, Q9 on MU Driver board
Expected: ~0 ohms indicates short
Tools: Ohmmeter

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

Abnormal encoder detected (D3) caution

Encoder signal abnormal or not detected

Ranked causes

1. MUX DRIVE unit abnormal (common)
2. Motor or encoder faulty (common)

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

Arm lock and release not functioning caution

Arm cannot be easily locked or released from parked position, or drive motors not in high speed during parking

Ranked causes

1. Lock release button malfunction (unknown)
2. Drive motor speed not at high speed during parking (unknown)

First check

Verify arm can be easily locked from parked position

Test point: lock release buttons
Expected: Arm locks smoothly

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

Battery indicator shows 1-3 LEDs despite full charge

Battery indicator light displays 1-3 LEDs even though batteries are fully charged; condition persists after power recycling; all 5 LEDs light when charging is attempted again

Ranked causes

1. Power cable issue or charging connection problem (common)
2. Software version incompatibility (common)

First check

Verify power cable is properly connected

Test point: Power cable connection
Expected: Cable properly seated and making contact

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

d3 error - Abnormal motor encoder detected

Encoder signal abnormal or absent for one or both motors

Ranked causes

1. Loose or damaged encoder cable connections (common)
2. Motor encoder defective (occasional)

First check

Verify motor encoder cable connections on MU Driver PCB

Test point: Encoder connectors on MU Driver PCB
Expected: Cables fully seated and undamaged

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

d3 warning error displayed

Warning error message d3 appears on panel display. Indicates abnormal encoder detected for one of the drive motors.

Ranked causes

1. Defective motor encoder (common)
2. Encoder cable connection fault (occasional)

First check

Verify encoder motor speeds in Adjustment Mode diagnostics

Test point: Motor speed check in Adjustment Mode
Expected: Left wheel speed and right wheel speed should be relatively close: around 1km/hr in slow speed and 5km/hr in high speed
Tools: Remote control, Adjustment Mode tool

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

Determine MA setting for KV and MAS selection radiation

MA (milliamperage) is automatically determined by software based on operator-selected KV and MAS values and battery charge state. System operates in normal mode when green LEDs are lit without red LED, or low battery mode when red LED and one green LED are lit.

Ranked causes

1. Normal battery mode operation (common)
2. Low battery mode operation (occasional)

First check

Verify battery status by checking control panel indicator LEDs

Test point: Battery indicator on control panel
Expected: Green LEDs lit with red LED off for normal mode, or red LED and one green LED lit for low battery mode

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

F11 KV over voltage high voltage

Measured tube voltage is higher by approximately 30 kV or more than preset value, detected by software at 20ms after exposure and each 100ms.

Ranked causes

1. Tube voltage feedback circuit malfunction (common)
2. X CONT, X-ray tube, or high voltage transformer defective (occasional)

First check

Measure CP9 (TKV), CP12 (RKV), CP11 (TMA), CP13 (RMA) on X CONT

Test point: Test points CP9, CP12, CP11, CP13 on X CONT board
Expected: RKV and RMA normal feedback; TKV and TMA as programmed
Tools: Multimeter or oscilloscope

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

F14 KV brake abnormal high voltage system discharge radiation

Abnormal measured tube voltage or X-ray tube discharge detected by hardware. Error may be eliminated by aging; discharge in high voltage system suspected.

Ranked causes

1. X-ray tube discharge, high voltage cable, transformer, or control circuit fault (common)
2. False error message or low-probability PCB defect (rare)

First check

Perform aging on X-ray tube

Test point: X-ray tube high voltage circuit
Expected: Aging completes without excessive discharge sounds or error recurrence

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

F31 IF over filament current high high voltage

Measured filament current is higher by 50% or more than preset value, detected by software at each 800ms during prep and 400ms during ready.

Ranked causes

1. Filament heating control or sensing circuit malfunction (common)
2. INVERTER UNIT or high voltage filament transformer fault (occasional)

First check

Measure FVR (CP15) and IFV (CP7) on X CONT

Test point: Test points CP15 (FVR) and CP7 (IFV) on X CONT
Expected: Both normal, or only FVR abnormal
Tools: Multimeter

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

Force Sensing Resistor (FSR) response degraded or absent

Handle does not respond predictably to pressure; driving characteristics inconsistent or no motor output when handle is pressed.

Ranked causes

1. FSR pads aged or degraded (common)
2. FSR cable connection loose or damaged (occasional)

First check

Measure FSR input signal at right FSR test point with no pressure applied

Test point: CP11 on MU Driver PCB (right FSR)
Expected: 2.5VDC offset
Tools: DMM (DC voltage)

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

Fuse F4 or F5 blown repeatedly caution

Fast blow fuse opens immediately after power-on; slow blow fuse may overheat without opening initially; affects motor power supply

Ranked causes

1. Shorted FET on MU Driver board (common)
2. Short circuit in motor winding or motor power cables (occasional)

First check

Measure FET source-drain resistance on MU Driver board

Test point: Q6, Q7, Q8, Q9 on MU Driver board
Expected: ~0 ohms indicates short; normal should be open circuit or high ohms
Tools: Ohmmeter

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

H3 X-ray tube assembly temperature high patient safety

Temperature of X-ray tube assembly is too high beyond safe operating threshold.

Ranked causes

1. X-ray tube thermal switch activated due to overheating (common)
2. Thermal switch signal fault (false alarm) (occasional)

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

Handle Force Sensing Resistor (FSR) not responding correctly

FSR pads fail to detect handle pressure or provide inconsistent input

Ranked causes

1. FSR pads aged or degraded (common)
2. FSR pads damaged or worn (occasional)

First check

Measure right FSR signal at CP11 on MU Driver PCB

Test point: CP11
Expected: 2.5V offset with no pressure; normal range 1-4V with handle pressure
Tools: Voltmeter

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

Incorrect motor output voltage for drive speed high voltage

Motor power output does not match expected voltage for selected drive speed direction

Ranked causes

1. Input voltage from MUX Power PCB incorrect (occasional)
2. MU Driver PCB not applying correct motor voltage (occasional)

First check

Measure MUX Power PCB input voltage at CP15

Test point: CP15
Expected: 120V
Tools: Voltmeter

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

Motor overcurrent detected (D1) caution

Motor current detected as 6A or greater for more than 10 seconds

Ranked causes

1. MUX DRIVE unit faulty (common)
2. Motor faulty (common)

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

Noises during travel caution

Unusual noises heard during unit movement

Ranked causes

1. Loose fastening hardware (common)
2. Worn or damaged cables (occasional)

First check

Listen for unusual noises during travel

Test point: entire moving assembly
Expected: No unusual noises during extension, tilt, rotation, and pivot motion

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

Software version compatibility with EMC Standard editions

Specific software versions are required or restricted based on system EMC Standard compliance edition, with version-dependent DIPSW2-6 settings

Ranked causes

1. V1.50 software only compatible with EMC Second Edition systems (common)
2. V1.52 and later support both EMC Standard editions with proper DIPSW2-6 configuration (common)

First check

Identify system EMC Standard edition

Test point: System specification or documentation
Expected: First Edition compliant or Second Edition compliant

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

Software version incompatibility with EMC standard compliance

Incorrect software version installed for system EMC standard edition

Ranked causes

1. V1.50 software on EMC First Edition compliant system (occasional)
2. Software version earlier than V1.50 on EMC Second Edition compliant system (occasional)

First check

Verify software version and EMC standard compliance of system

Test point: System software version and EMC certification
Expected: For EMC First Edition: V1.50 or later (V1.52+ recommended). For EMC Second Edition: V1.50 or later with DIPSW2-6 OFF

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

Abnormal sound or vibration during arm movement caution

Audible noise or unusual phenomenon when moving the gantry arm forward and backward

Ranked causes

1. Improper chain tension (common)

First check

Listen for abnormal sound during arm forward and backward movement

Test point: Gantry arm
Expected: No abnormal sound or phenomenon

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

Arm not locked during retraction patient safety

X-ray tube unit may run off toward the front when arm section is retracted during normal moving

Ranked causes

1. Arm lock mechanism failed or not engaged (unknown)

First check

Visually inspect arm lock status

Test point: Arm section during retraction
Expected: Arm is locked and X-ray tube unit does not move toward front

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

Arm rotation exceeds ±180 degrees caution

Gantry arm cannot rotate properly around its axis, rotation range is insufficient

Ranked causes

1. Inappropriate cable wiring (common)

First check

Verify arm rotation range around vertical axis

Test point: Gantry arm axis
Expected: Arm rotation of ±180 degrees

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

Battery charge current abnormal (F5a, F5E, F5F) high voltage

Charging current exceeds 3.8A, or measured current deviates >50% (F5E) or <30% (F5F) from specified value for >10 seconds

Ranked causes

1. Charge circuit problem (common)

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

Battery indicator light turned red after charging

Battery indicator light displays red after the battery has been charged

Ranked causes

1. Software version earlier than 1.53 (common)

First check

Verify current software version

Test point: System display
Expected: Version 1.52 or earlier

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

Battery indicator Red LED illuminates despite nearly full charge

Battery indicator Red LED lights on even though batteries are almost fully charged; occurs when battery charging has not completed within 10 hours

Ranked causes

1. Charging cycle did not complete within 10 hours (common)

First check

Verify charging duration

Test point: Charging time
Expected: Charging completes within 10 hours

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

Battery indicator shows insufficient charge despite full battery

Battery indicator displays only 4 green bars or fewer even when battery is fully charged

Ranked causes

1. Incorrect battery code set for old-type PXL12072 battery (common)

First check

Identify battery type by serial number

Test point: Battery serial number stamp
Expected: 000703 or earlier for old type

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

Battery level indicator inaccuracy

Battery level indicator does not accurately reflect actual battery voltage

Ranked causes

1. Outdated software V1.24 or earlier on NEXSC board (common)

First check

Power OFF and remove right side cover

Test point: MUX-100 housing
Expected: Access to NEXSC board visible

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

Bumper touches floor improperly

Front bumper not touching floor or contact condition is incorrect

Ranked causes

1. Bumper pad worn or dirty (occasional)

First check

Verify bumper touches floor

Test point: Front bumper contact point
Expected: Bumper touching the floor

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

Buzzer does not sound during exposure

Alarm buzzer fails to activate when X-ray exposure occurs

Ranked causes

1. Buzzer alarm malfunction (unknown)

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

Calibration: Arm retraction detector micro switch patient safety

Adjustment of micro switch position to ensure proper arm retraction detection and safety lock function

Ranked causes

1. Micro switch requires repositioning after locking hook replacement (common)

First check

Place spacer washers and simulate cover thickness

Test point: Catch position frame
Expected: M6 flat washers placed; top-plate positioned on washers

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

Calibration: Arm rotation torque and x-ray tube alignment high voltage

Post-assembly adjustment of FU nut torque and x-ray tube tilt to ensure proper mechanical function and beam alignment

Ranked causes

1. Assembly completion requires torque and alignment verification (common)

First check

Measure torque at collimator handle after FU nut adjustment

Test point: Collimator handle front end during arm rotation
Expected: 5 to 7 kg, 5-7 kg

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

Calibration: Brake plate replacement for noise suppression caution

Installation of noise-suppressing brake plate (t=3.2) in the electromagnetic brake assembly for up/down column movement

Ranked causes

1. Standard noise reduction modification (unknown)

First check

Obtain required kit and tools

Test point: Kit 503-52206 contents, tool inventory
Expected: Kit 503-52206 with plate 503-52158, Phillips screwdriver, L-wrench M5, Lock-tight #242, small tie-wrap available

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

Calibration: Cable and connector inspection high voltage

Inspection and lubrication of cables for damage, wear, and proper terminal condition on HV cable

Ranked causes

1. Cable damage, excessive wear, or dry terminals (unknown)

First check

Inspect all cables visually

Test point: Cable insulation and routing
Expected: No damage, cracks, cuts, or excessive wear visible

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

Calibration: Drive handle and brake release operation caution

Verification that drive handle operation and brake release correspond correctly to unit motion

Ranked causes

1. Drive handle or brake control misalignment or wear (unknown)

First check

Operate drive handle through full range

Test point: Drive handle control and motor response
Expected: Unit motion corresponds to handle position

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

Calibration: Drive handle fastening hardware verification caution

Verification that drive handle fastening hardware is properly secured

Ranked causes

1. Loose fastening hardware on drive handle (unknown)

First check

Inspect drive handle fastening hardware

Test point: All drive handle mounting fasteners
Expected: All hardware firmly secured and tightened

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

Calibration: Drive motor and lock operation caution

Verification that arm lock and release functions work properly and drive motors operate at correct speed when tube arm is parked

Ranked causes

1. Lock mechanism wear or motor speed degradation (unknown)

First check

Lock arm from parked position

Test point: Arm lock mechanism
Expected: Arm locks easily and securely

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

Calibration: Emergency stop switch operation patient safety

Verification that emergency stop button illuminates when pressed and all driving capability is suspended

Ranked causes

1. Emergency stop switch failure or electrical fault (unknown)

First check

Verify button illumination

Test point: Emergency stop button indicator lamp
Expected: Button illuminates when pressed

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Calibration: Fast blow fuse upgrade caution

Procedure to change drive motor fuses from slow blow to fast blow type for improved protection against shorted FET damage

Ranked causes

1. Upgrade fuses for enhanced FET protection (common)

First check

Identify and remove fuse F4 on MUX Power board

Test point: Fuse F4 location (+120V supply)
Expected: Current fuse is slow blow type 072-01659-83 (10A 250V)
Tools: Field Service Tools

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Calibration: FET protection with RTV rubber caution

Preventive application of RTV silicone rubber to FET circuit terminals during periodic maintenance to prevent short circuits from dust contamination

Ranked causes

1. Preventive maintenance procedure (common)

First check

Inspect FET circuit area for contamination

Test point: Area around Q6, Q7, Q8, Q9 terminals
Expected: Clean, dust-free surface with no foreign matter

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Calibration: Front bumper alert and motion stop patient safety

Verification that front bumper contact triggers audible alert and stops forward unit motion

Ranked causes

1. Bumper switch or alert circuit failure (unknown)

First check

Engage front bumper

Test point: Front bumper switch
Expected: Audible alert sounds

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Calibration: Handle adjustment

Adjust handle calibration per adjustment mode procedure

Ranked causes

1. Handle requires calibration (unknown)

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Calibration: Handle Force Sensing Resistor

Adjust FSR response to ensure consistent driving response as pads age or after replacement.

Ranked causes

1. FSR pad aging affects response consistency (common)

First check

Enter Adjustment Mode and access Handle Calibration

Test point: Adjustment Mode menu
Expected: Handle Calibration option accessible
Tools: Remote control, MUX-100 system

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More symptoms

Calibration: Input supply voltage setting
Calibration: Lock release button operation
Calibration: Mechanical motion verification
Calibration: Motor replacement (old to new style)
Calibration: MUX-100 exposure linearity
Calibration: Waveform Adjustment
Calibration: X-ray collimator field alignment
Calibration: X-ray tube and collimator alignment
Calibration: X-ray tube and fastening hardware verification
Charging cable does not illuminate charging meter
Charging cable does not retract and lock
Charging circuit does not work normally with Key Switch ON
Charging does not start with power plug connected
Column ASSY roller base plate damaged
Column leaning or misalignment
Counterweight fixation before tube removal
Counterweight not fixed before tube removal
Drive handle or brake release operation mismatched to motion
E battery backup life low
EEE battery backup life expired
Emergency circuit triggered (F6d)
Emergency discharge recovery charging behavior change
Emergency stop circuit malfunction
Emergency stop switch not functional
Emergency stop switch not functioning
Error code F5b occurs
Error code F5b triggered by battery behavior
Excessive noise during unit movement and driving
Exposure buzzer does not sound during X-ray exposure
Exposure cutoff circuit abnormal (F62)
Exposure did not terminate (F6E)
F03 control circuit power supply abnormal
F12 code troubleshooting flowchart
F21 MA over current
F22 MA under current
F32 IF under filament current low
Film box frame sagging
Front bumper audible alert not functioning
Front bumper misalignment
H1 anode heat over tolerance
H2 anode heat at tolerance limit
High voltage cable and X-ray tube connection verification
High voltage generated with disconnected cable or tube
IGBT abnormal gate waveform
IGBT gate waveform observed in charged status
Improper arm rotation torque
Incorrect MA displayed or applied during exposure
Inspection: Arm catch alignment verification
Inspection: Collimator alignment verification
Inspection: Front bumper alignment verification
Inspection: Unusual noises during travel
Mobile Art mobility characteristics altered
Motor abnormality not detected
Motor power supply voltage incorrect or absent
Motor travel does not respond to handle input or is unpredictable
Operator receives static shock from unit
Photo sensor wires disconnected on power assist handle
Photo-sensor or FSR wiring breakage on motorized handle
PROM memory data loss after firmware update
Radiographic exposure linearity correction needed
Short circuit between FET pins on MU DRIVER board
Sliding arm cannot support X-ray tube
Sliding arm support degradation
Stopper Pin drops from Arm unit
Tube arm does not park correctly
Tube voltage drops with new-type PXL12072 battery installed
Wheels and hubcaps not secure
Wire rope corrosion or damage
X-ray tube arm releases from latch and moves upward
X-ray tube fastening hardware loose
X-ray tube support arm deterioration
X-ray tube tilting at vertical detent position

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

Error codes

Code	Meaning	Trigger	Severity
`d0`	Motor abnormality detected	Motor malfunction detected during operation	error
`d0`	Drive motor error detected	Motor feedback irregularity detected; error appears briefly on panel display and is logged in system error log	warning
`d1`	DC drive motor excessive current draw	One of the DC drive motors draws more than 6A for more than 10 seconds	warning
`D10`	Arm lock release switch stuck ON at power-up	Arm lock release switch detected ON during startup	warning
`D11`	Arm lock release lever stuck ON at power-up	Arm lock release lever detected ON during system startup	warning
`d2`	Drive motor fault variant	Motor feedback sampling detects irregularity	warning
`d3`	Abnormal encoder detected for one drive motor	Encoder signal absent, abnormal, or out of specification detected for left or right motor	warning
`D4`	Brake release switch stuck ON at power-up	Brake release switch detected ON during system startup	warning
`D5`	Small movement forward switch stuck ON at power-up	Forward small-movement switch detected ON during startup	warning
`D6`	Small movement backward switch stuck ON at power-up	Backward small-movement switch detected ON during startup	warning
`D7`	Drive handle left switch stuck ON at power-up	Left drive handle switch detected ON during startup	warning
`D8`	Drive handle right switch stuck ON at power-up	Right drive handle switch detected ON during startup	warning
`D9`	Bumper switch stuck ON at power-up	Bumper switch detected ON during system startup	warning
`E`	Battery backup life low	CPU memory backup lithium battery voltage below minimum threshold	warning
`E`	CPU memory backup battery needs replacement	Battery voltage drops below acceptable level for memory backup	error
`EEE`	Battery backup life expired	CPU memory backup lithium battery voltage at or below end-of-life threshold	error
`EEE`	Data erasure confirmation message displayed during boot	Appears on display approximately 3 seconds after power-on following EPROM upgrade	info
`F01`	Supply voltage high	Input supply voltage approximately 20% or more above nominal value, detected by software	error
`F01, F02`	Supply voltage out of normal range	Input mains voltage or system supply voltage outside specifications	error
`F02`	Supply voltage low	Input supply voltage approximately 30% or more below nominal value, detected by software	error
`F03`	-15V control circuit power abnormal (hardware detected)	Monitoring detects -15V supply fault on X CONT	error
`F03`	-15V check signal is not supplied	Missing -15V reference signal at startup	error
`F03`	Power supply -15V circuit fault	Hardware detection of -15V power supply abnormality	error
`F11`	KV is detected to be more than 30KV higher than the set value	Tube voltage exceeds setpoint by >30KV	error
`F11`	Tube voltage over limit (KV OVER)	Measured tube voltage is 30 kV or more above preset value at 20ms after exposure start and each subsequent 100ms	error
`F11, F12, F13, F14`	X-ray tube voltage control fault	High voltage control circuit malfunction or voltage regulation failure	error
`F12`	Tube voltage under limit (KV UNDER)	Measured tube voltage is 50% or less of preset value at 20ms after exposure and each 100ms; glow discharge likely in tube	error
`F12`	Measured kV below minimum threshold of kV setting	Detected when measured kV falls below threshold	error
`F12`	KV UNDER - tube voltage is lower by 50% or more than preset value	Detected by software at 20ms after exposure and at each 100ms interval	error
`F12`	KV UNDER – measured tube voltage is 50% or more below preset value	Detected by software at 20ms after exposure and at each 100ms interval	error
`F13`	KV is lower than 10KV	Tube voltage drops below 10KV minimum	critical
`F13`	No tube voltage (NO KV)	Measured tube voltage is 10 kV or less at 20ms after exposure and each 100ms	critical
`F14`	KVBR signal is supplied	KV breakdown signal detected	critical
`F14`	KV brake - high voltage discharge detected	Abnormal measured tube voltage or X-ray tube discharge detected by hardware	error
`F21`	Tube current over limit (MA OVER)	Measured tube current is 50 mA or more above preset value at 20ms after exposure and each 100ms	error
`F21`	mA is more than 50mA higher than the set value	Tube current exceeds setpoint by >50mA	warning
`F21, F22, F23`	X-ray tube current control fault	Tube current (mA) control circuit malfunction or feedback error	error
`F22`	mA is more than 50mA lower than the set value	Tube current falls below setpoint by >50mA	warning
`F22`	Tube current under limit (MA UNDER)	Measured tube current is 50% or less of preset value at 20ms after exposure and each 100ms	error
`F23`	No tube current (NO MA)	Measured tube current is 10 mA or less at 20ms after exposure and each 100ms	critical
`F23`	mA is lower than 10mA	Tube current drops below 10mA minimum	error
`F31`	Filament current over limit (IF OVER)	Measured filament current is 50% or more above preset value at 800ms intervals during prep, 400ms during ready	error
`F31`	Heater voltage is more than 50% higher than the set value	Filament heater voltage exceeds 50% above nominal	warning
`F31, F32, F33`	Filament heating control fault	Filament heater circuit malfunction or temperature control failure	error
`F32`	Heater voltage is more than 50% lower than the set value	Filament heater voltage drops >50% below nominal	warning
`F32`	Filament current under limit (IF UNDER)	Measured filament current is 50% or more below preset value at 800ms intervals during prep, 400ms during ready	error
`F33`	Heater voltage is lower than 1V	Filament heater voltage below minimum 1V	error
`F33`	No filament current or current below 1A	Filament current <1A detected every 800ms during prep or 400ms when ready	error
`F51`	Battery imbalance detected	Voltage imbalance between battery sides during operation	warning
`F51`	Battery voltage during charging >155V	Charging cycle voltage exceeds 155V	warning
`F51, F52, F53, F54, F55, F56, F57, F58, F59, F5A, F5B, F5C,`	Charge control fault	High voltage charging or capacitor charge control circuit malfunction	error
`F52`	Battery imbalance detected	Voltage imbalance between battery sides during operation	warning
`F52`	Battery voltage during charging <100V	Charging cycle voltage falls below 100V	warning
`F53`	Battery imbalance detected	Voltage imbalance between battery sides during operation	warning
`F54`	Battery imbalance detected	Voltage imbalance between battery sides during operation	warning
`F54`	Secondary battery voltage during charging outside range	Secondary battery voltage <100V or >155V	warning
`F55`	Battery charged voltage imbalance: + side voltage more than 12V higher than – side	Detected during charging and when charging stops	error
`F56`	Minus-side battery voltage >15% higher than plus-side	Voltage imbalance: minus side exceeds plus side by >15%	warning
`F5a`	Signal CHBR1 is supplied (Charging current is higher than 3.8A)	Battery charging current exceeds 3.8A threshold	warning
`F5b`	Battery voltage exceeds ±155V	BRON signal supplied; battery voltage >+155V or <-155V	error
`F5b`	Signal CHBR2 is supplied (Battery voltage on plus or minus side during charging is higher than 155V)	Battery voltage exceeds 155V during charging cycle	error
`F5b`	Battery level indicator misalignment with actual battery voltage	Discrepancy between battery level indicator and actual battery voltage	error
`F5b`	Battery behavior related error	Incorrect battery voltage interpretation by pre-V1.25 software	warning
`F5b`	Battery-related error triggered during recharge after prolonged idle period	Attempting to recharge MUX-100 after extended unused period (e.g., post-installation)	warning
`F5C`	Check main breaker	Main breaker fault detected	error
`F5E`	Charging current >50% above specified value for >10s	Measured charging current deviates >50% high for ≥10 seconds	error
`F5F`	Charging current <30% of specified value for >10s	Measured charging current deviates >70% low for ≥10 seconds	error
`F61`	Starter fault	X-ray tube starter (trigger) circuit malfunction	error
`F61`	Rotor starter error; rotor does not rotate	Starter does not issue current detection confirmation signal; stator coil current absent or <1V	error
`F62`	Bucky unit operation abnormality	Automatic table or Bucky grid positioning mechanism malfunction	error
`F62`	Exposure control system not responding	XOK signal not returned within 1 second after HX1 input	warning
`F6d`	Emergency circuit activated	Emergency status detected by control system	critical
`F6E`	Exposure did not terminate as commanded	Exposure continued beyond preset timing or mAs setting	critical
`F6E, F6F`	Irradiation control or photo timer fault	Exposure control or automatic exposure shutoff circuit malfunction	error
`F6F`	Exposure control circuit abnormal	KVT (kV rising signal) not returned within 250ms after EXR sent; simultaneous IPOF signal or initial setting error	error
`H1`	Anode heat over tolerance	Accumulated heat on anode exceeds preset limit during CPU heat calculation	warning
`H1`	Accumulated heat capacity alarm	CPU calculates excessive accumulated heat from prior exposures	warning
`H2`	Accumulated heat capacity alarm	CPU calculates excessive accumulated heat from prior exposures	warning
`H2`	Anode heat at tolerance limit	Accumulated heat on anode reaches preset limit; further exposure will exceed limit	warning
`H3`	X-ray tube thermal switch activated	Thermal switch of X-ray tube activates	warning
`H3`	X-ray tube assembly temperature too high	X-ray tube thermal switch activated or thermal switch signal fault detected	warning
`H4`	X-ray tube assembly temperature too high	Temperature of X-ray tube assembly exceeds safe operating limit	warning

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

Community

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

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