X-ray units · Mini X-ray family

MinXray HF100H: troubleshooting and error codes

The ServiceForge knowledge base holds 31 documented symptoms for the MinXray HF100H, with 33 ranked causes, 58 diagnostic checks with test points and expected values, and 2 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Calibration: Pre-heat and mA adjustment radiation

Adjust pre-heat time to 30 msec±10 msec and mA output to 20 mA via VR3 and VR5. Requires actual X-ray exposure and oscilloscope monitoring.

Ranked causes

1. Pre-heat time and mA require adjustment after Insert Box or M9112 PCB replacement (common)
2. Pre-heat time adjustment via VR3 (common)
3. mA adjustment via VR5 (common)

First check

Observe pre-heat time on oscilloscope

Test point: CH2 (IP) waveform on oscilloscope
Expected: 30 msec. ±10 msec (acceptable 20–40 msec), ±10 msec

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Calibration: 100 kV adjustment radiation

Set output voltage at 100 kV setting to required level via VR4 potentiometer adjustment

Ranked causes

1. VR4 adjustment needed for 100 kV calibration (common)

First check

Measure ch1 (Ep) voltage at 100 kV setting

Test point: ch1 (Ep) on M9112 PC Board
Expected: 4.9 V ±0.5 V, ±0.5 V

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Calibration: 24 VDC power supply output high voltage

SVB24SA board 24 VDC regulated output must be 24V ±0.3V DC

Ranked causes

1. SVB24SA VR potentiometer requires adjustment for stable 24 VDC output (common)

First check

Measure SVB24SA output voltage

Test point: Red (+) and Black (–) wires on SVB24SA board
Expected: 24 V DC, 23.7 - 24.3 V (±0.3 V)
Tools: Calibrated DC voltmeter

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Calibration: 24VDC power supply high voltage

Adjust output voltage on SVB24SA board to ensure stable 24V supply to system

Ranked causes

1. Factory adjustment incomplete or drift from specification (unknown)

First check

Measure output voltage at SVB24SA

Test point: Red (+) and Black (–) wires
Expected: 24V, ±0.3V

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Calibration: 70 kV adjustment radiation

Set output voltage at 70 kV setting to required level via VR4 potentiometer adjustment

Ranked causes

1. VR4 adjustment needed for 70 kV calibration (common)

First check

Measure ch1 (Ep) voltage at 70 kV setting

Test point: ch1 (Ep) on M9112 PC Board
Expected: 3.4 V ±0.5 V, ±0.5 V

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Calibration: Exposure time (M3108A) high voltage

Adjust exposure time base circuit to produce correct timing intervals at 100Hz base frequency

Ranked causes

1. Exposure time adjustment needed after board installation or repair (unknown)

First check

Disconnect JP2 connector on M3108A PCB

Test point: JP2 connector
Expected: Connector fully disconnected

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Calibration: Exposure time adjustment radiation

Readjust exposure time after connecting all connectors. Requires actual exposure with external meter measurement.

Ranked causes

1. Exposure time requires calibration after connector reconnection (common)

First check

Verify all connectors are fully connected before adjustment

Test point: All unit connectors
Expected: Fully seated

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Calibration: filament pre-heat voltage at 20 mA high voltage

VR3 adjustment on M9112 PCB to set pre-heat voltage to 0.43 V at 20 mA tube current

Ranked causes

1. VR3 pre-heat voltage requires tuning to 0.43 V for 20 mA filament current (common)

First check

Measure pre-heat voltage at 20 mA setting

Test point: PRE (+) and GND on M9112 PCB
Expected: 0.43 V DC, ±0.01 V
Tools: Calibrated DC voltmeter

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Calibration: kV adjustment for HF100H radiation

X-ray tube voltage (kV) requires calibration after connector installation or PCB replacement. Measured via oscilloscope on EP waveform.

Ranked causes

1. X-ray tube voltage out of specification after M9101B or Insert Box replacement (common)

First check

Connect oscilloscope and verify probe placement

Test point: EP, IP on M9112 PC Board; GND terminal
Expected: CH1 probe on EP, CH2 probe on IP, GND to GND terminal; oscilloscope set to 1V/div (CH1), 0.5V/div (CH2), 10msec/div
Tools: Oscilloscope with storage mode

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Calibration: kV adjustment on M3108AH board without HF Tester

Adjust DC voltage at kV selector 100 kV via VR1 potentiometer to set output voltage

Ranked causes

1. VR1 adjustment needed for kV calibration (common)

First check

Measure DC voltage at kV control pins

Test point: J3-8 pin (+) and J3-2 pin (-) on M3108AH PC board
Expected: 5 V
Tools: DMM

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Calibration: kV feedback circuit pre-adjustment radiation

DC voltage levels on M3108AH PCB kV feedback circuit setup before main kV adjustment

Ranked causes

1. VR1 potentiometer on M3108AH PCB requires initial setup (common)

First check

Set initial kV reference voltage at 100 kV

Test point: kV (+) and GND on HF Tester
Expected: 5.0 V DC, ±0.1 V
Tools: Calibrated DMM, HF Tester equipment

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Calibration: kV measurement verification with external meter radiation

When using non-invasive direct x-ray measuring equipment (NERO) to verify kV, account for approximately 3kV deviation between oscilloscope EP measurement and actual tube voltage.

Ranked causes

1. Discrepancy between oscilloscope waveform measurement and actual x-ray tube voltage (common)

First check

Measure actual x-ray tube kV with non-invasive external meter (NERO) at 100kV setting

Test point: X-ray tube output
Expected: 97.5–99kV (accounting for 3kV deviation from oscilloscope EP waveform measurement), 97.5–99kV
Tools: Non-invasive direct x-ray measuring equipment (NERO or equivalent)

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Calibration: kV output (M3108A) radiation

Adjust kV selector output to correct voltage levels using HF Tester special equipment

Ranked causes

1. kV adjustment requires factory calibration or post-service reset (unknown)

First check

Prepare HF Tester equipment

Test point: M3108A board connectors
Expected: HF Tester ready and connected

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Calibration: kV output adjustment radiation

X-ray tube voltage requires adjustment when insert box or inverter PCB is replaced, or after factory service

Ranked causes

1. kV feedback circuit requires tuning via VR4 potentiometer on M9112 PCB (common)

First check

Measure EP waveform voltage at 70 kV setting

Test point: EP on M9112 PCB
Expected: 3.4 V average of peak values, ±0.1 V
Tools: Oscilloscope with storage mode, CH1 1V/div 10msec/div

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Calibration: M9111 PCB (Over Voltage and Over Current Protection) high voltage

Adjust protection circuit thresholds on M9111 board to prevent equipment damage and ensure safe operation

Ranked causes

1. Protection circuits require initial calibration or re-calibration after service (unknown)

First check

Ensure all connectors fully connected

Test point: M9111 PCB connectors
Expected: All connectors seated and secured

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Calibration: M9111-1 protection and voltage circuits high voltage

Over-voltage, over-current, and DC 370V output adjustments on M9111-1 PCB

Ranked causes

1. VR3 requires DC 370V output adjustment to spec 368.5-372 V (common)

First check

Measure DC 370V output

Test point: 370 (+) and GND (–) on M9111-1 PCB
Expected: 368.5 - 372 V DC, 368.5 - 372 V
Tools: Calibrated DC voltmeter

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Calibration: M9112 inverter frequency and filament circuit high voltage

Inverter frequency (FQ1 at 120 kHz), filament pre-heat voltage, and tube potential/current feedback potentiometers on M9112 PCB

Ranked causes

1. VR1 inverter frequency requires tuning to 120 kHz nominal operation (common)

First check

Measure FQ1 inverter frequency

Test point: FQ1 (+) and GND on M9112 PCB
Expected: 120 kHz, ±0.5 kHz
Tools: Oscilloscope or frequency counter

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Calibration: M9112 PCB (Inverter and kV/mA circuits) high voltage

Adjust inverter frequency, pre-heat voltage, and kV/mA set points on M9112 board

Ranked causes

1. Inverter and output circuits require initial calibration or re-calibration after service (unknown)

First check

Ensure all connectors fully connected

Test point: M9112 PCB connectors
Expected: All connectors seated and secured

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Calibration: M9112 tube current feedback (VR5 IP SET) high voltage

VR5 potentiometer centered on M9112 PCB; actual mA regulation tuning occurs during pre-heat and mA setup

Ranked causes

1. VR5 (IP SET) tube current feedback potentiometer must be centered as baseline (common)

First check

Position VR5 potentiometer to mechanical center

Test point: VR5 (IP SET) on M9112 PCB
Expected: Center mechanical position
Tools: Screwdriver for potentiometer adjustment

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Calibration: M9112 tube potential feedback (VR4 EP SET) high voltage

VR4 potentiometer centered on M9112 PCB; actual adjustment occurs during kV re-calibration with load

Ranked causes

1. VR4 (EP SET) tube potential feedback potentiometer must be centered as baseline (common)

First check

Position VR4 potentiometer to mechanical center

Test point: VR4 (EP SET) on M9112 PCB
Expected: Center mechanical position
Tools: Screwdriver for potentiometer adjustment

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Calibration: mA adjustment on M3108AH board without HF Tester

Adjust DC voltage at mA control via VR5 potentiometer to calibrate mA output to 20 mA

Ranked causes

1. VR5 adjustment needed for mA calibration (common)

First check

Measure DC voltage at mA control pins

Test point: J3-3 pin (+) and J3-2 pin (-) on M3108AH PC board
Expected: 2 V
Tools: DMM

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Calibration: mA output (M3108A) radiation

Adjust mA selector output to correct current levels using HF Tester special equipment

Ranked causes

1. mA adjustment requires factory calibration or post-service reset (unknown)

First check

Measure DC voltage at 20mA setting

Test point: mA (+) and GND on HF Tester
Expected: 2.0V

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Calibration: mA tube current adjustment radiation

Tube current feedback circuit setup to 20 mA constant output on M3108AH PCB

Ranked causes

1. VR5 potentiometer on M3108AH PCB requires initial tuning for 20 mA feedback (common)

First check

Set mA reference voltage at nominal setting

Test point: mA (+) and GND on HF Tester
Expected: 2.0 V DC, ±0.1 V
Tools: Calibrated DMM, HF Tester equipment

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Calibration: Over-Current Protection (OCP) circuit high voltage

Over-current protection threshold set via VR2 on M9111-1 PCB to 1.09-1.11 V

Ranked causes

1. VR2 OCP threshold requires adjustment to protect against tube over-current (common)

First check

Measure OCP threshold voltage

Test point: OCP (+) and GND (–) on M9111-1 PCB
Expected: 1.09 - 1.11 V DC, 1.09 - 1.11 V
Tools: Calibrated DC voltmeter

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Calibration: Over-Voltage Protection (OVP) circuit high voltage

Over-voltage protection threshold set via VR1 on M9111-1 PCB to 2.4-2.45 V

Ranked causes

1. VR1 OVP threshold requires adjustment to protect against excessive tube voltage (common)

First check

Measure OVP threshold voltage

Test point: OVP (+) and GND (–) on M9111-1 PCB
Expected: 2.4 - 2.45 V DC, 2.4 - 2.45 V
Tools: Calibrated DC voltmeter

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Exposure switch not responding in two-stage operation radiation

Exposure switch stages (pre-heat and actual exposure) do not function as expected

Ranked causes

1. Incorrect exposure switch operation technique (occasional)

First check

Verify WARM UP indicator is OFF

Test point: WARM UP indicator on control panel
Expected: Indicator OFF; all WARNING LAMPS off

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Measure mA output via mA jack radiation

Measure mA output using 3.5 mm single round phone jack on rear panel during X-ray exposure. Convert voltage reading to mA using calibration factor.

Ranked causes

1. mA measurement via jack connector (common)

First check

Measure voltage at mA jack during exposure

Test point: mA jack (3.5 mm single round phone jack) on rear panel
Expected: 2.00 V for 20 mA (proportional)
Tools: Oscilloscope or voltmeter

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Unit malfunction indicated caution

ERROR indicator lamp is illuminated on control panel; X-ray generation is blocked

Ranked causes

1. Internal circuit malfunction (unknown)

First check

Verify ERROR indicator status

Test point: ERROR indicator on control panel
Expected: Indicator is OFF

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Unit not ready for exposure radiation

WARM UP indicator is illuminated on control panel, preventing X-ray generation

Ranked causes

1. Normal warm-up cycle after power-on (common)

First check

Verify WARM UP indicator status

Test point: WARM UP indicator on control panel
Expected: Indicator is OFF

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Unit not responding to power toggle caution

Rapid power cycling prevents normal operation; inverter does not function correctly

Ranked causes

1. Insufficient cool-down interval between power cycles (common)

First check

Verify power-off duration before restart

Test point: Time elapsed since POWER SWITCH OFF
Expected: At least 60 seconds

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Warm-up indicator remains on after exposure radiation

WARM UP indicator illuminates after X-ray exposure and does not extinguish as expected

Ranked causes

1. Normal thermal stabilization cycle after exposure (common)

First check

Verify WARM UP indicator extinguishment time after exposure

Test point: WARM UP indicator on control panel
Expected: Indicator OFF within 10 seconds after exposure completes

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Error codes

Code	Meaning	Trigger	Severity
`ERROR`	Unit malfunction detected	Indicates unusual condition in internal circuits; may persist even when EXPOSURE SWITCH button is released	error
`WARM UP`	Internal circuit is warming up	Activated immediately after POWER SWITCH ON or after each X-ray exposure	info

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

Community

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

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