X-ray generators · ATC family

Del Medical ATC 525: troubleshooting and error codes

The ServiceForge knowledge base holds 34 documented symptoms for the Del Medical ATC 525, with 46 ranked causes, 135 diagnostic checks with test points and expected values, and 7 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: mA waveform adjustment radiation

mA waveform amplitude not flat or average mA values incorrect at specified techniques (84 kV large focus 26 mAs, 110 kV large focus 26 mAs, 84 kV small focus 26 mAs)

Ranked causes

1. mA waveform amplitude flat adjustment required (common)
2. Fine tuning of mA amplitudes across power levels (occasional)
3. Small focus amplitude exceeds large focus amplitude (rare)

First check

Record predicted mA from Table One for technique

Test point: Table One reference
Expected: Predicted mA value for 84 kV large focus 26 mAs, 110 kV large focus 26 mAs, 84 kV small focus 26 mAs

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

Generator startup and operational verification high voltage

Initial power-on and functional verification of electrical systems, power supplies, relays, and control functions before clinical use

Ranked causes

1. Incomplete assembly or improper configuration (occasional)
2. Input power or distribution fault (occasional)
3. Power supply or component failure (occasional)

First check

Turn on main power disconnect switch

Test point: Main disconnect switch
Expected: Power applied to input terminals

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

AEC exposure terminates with GENERATOR fault

Exposure terminates with 'GENERATOR' fault message indicating premature generator termination

Ranked causes

1. Selected mAs insufficient for exposure requirements (common)
2. Ion chamber not in X-ray beam (occasional)

First check

Verify selected mAs value adequate

Test point: Central display - mAs parameter
Expected: mAs value sufficient for exposure type

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

Calibration: mA fault threshold (filament over-voltage limit) patient safety

Filament over-voltage limit circuit (mA Fault) requires adjustment or verification; maximum filament voltage needs calibration

Ranked causes

1. Filament over-voltage limit not properly set; R57 adjustment needed (occasional)
2. Boost time adjustment needed (R29 on mA/Rotor board) (occasional)

First check

Place mA/Rotor board on extender card

Test point: Card extender slot
Expected: Board accessible and powered

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

Calibration: mAs adjustment radiation

mAs output not within ±1 mAs specification at manual mode (tube one, large focal spot, 84 kV, ~100 mAs, ~0.5 sec exposure)

Ranked causes

1. mAs regulator primary adjustment required (R2) (common)
2. mAs regulator secondary adjustment required (R14) (occasional)

First check

Place mAs regulator board on extender card

Test point: Card extender slot
Expected: Board seated and accessible

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

Calibration: Negative pulse width (kV 0110 PWB) radiation

Negative pulse width not within specification (140 μsec ±10 μsec) at 80 kV, 32 mAs, large focus

Ranked causes

1. kV (0110) PWB R65 adjustment required (occasional)
2. kV (0110) PWB requires reseating after adjustment (common)

First check

Set generator parameters

Test point: Generator control panel
Expected: Tube 1, Large focus, 80 kV, 32 mAs, exposure time >50 ms

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

Calibration: SCR hold-off time radiation

SCR hold-off time requires calibration or verification, typically during routine maintenance

Ranked causes

1. SCR hold-off time adjustment required (occasional)
2. kV regulator board placement on extender (common)

First check

Connect oscilloscope Channel 1 to kV PWB Pin 10 (u3)

Test point: kV PWB Pin 10
Expected: Oscilloscope probe connected and grounded

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

Low input voltage at power module terminals caution

Voltage at input terminals falls below minimum required during exposure

Ranked causes

1. Excessive voltage drop in supply wiring (common)
2. Undersized distribution transformer (occasional)

First check

Measure voltage at ATC-525 power module input terminals during full load exposure

Test point: Power module input terminals
Expected: 235 VAC minimum (40 kW) or 224 VAC minimum (30 kW)

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

Power module input voltage overstress caution

Power module receives input voltage exceeding safe operating limits on TB1 or TB2

Ranked causes

1. Line match transformer taps set incorrectly (common)
2. Accessory power attachment to generator (occasional)

First check

Measure voltage into TB1

Test point: Power module TB1 (large terminal block)
Expected: not exceeding 290 VAC
Tools: AC voltmeter

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

X-ray exposure does not initiate radiation

Green READY light does not appear or red X-RAY light does not turn on when PREP and EXPOSE keys are pressed

Ranked causes

1. PREP key not held until READY light appears (common)
2. Generator not ready for exposure (occasional)

First check

Verify PREP key held until READY light

Test point: Green READY indicator light
Expected: READY light illuminated

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

AEC exposure terminates with BACKUP mAs fault

Exposure terminates early with 'BACKUP mAs' fault message displayed

Ranked causes

1. AEC mAs backup circuitry activation indicates possible system problem (rare)

First check

Confirm BACKUP mAs fault message

Test point: Central display screen
Expected: BACKUP mAs fault displayed

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

Alternate mA calibration without dynalyzer radiation

Verify mA output using oscilloscope and test points when dynalyzer unavailable

Ranked causes

1. Dynalyzer unavailable; alternate test method required (occasional)

First check

Connect scope probe to TP14 (mA+) on motherboard

Test point: TP14 on motherboard
Expected: Probe connected with good contact

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

Aluminum wire used in power supply caution

Aluminum conductors in input wiring instead of copper

Ranked causes

1. Installer substituted aluminum for copper wire (occasional)

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

Calibration verification with oscilloscope radiation

Verify calibration is correct using oscilloscope and Dynalyzer with specified parameters

Ranked causes

1. Calibration requires verification after adjustments (common)

First check

Connect oscilloscope channel 1 to Dynalyzer A+C

Test point: Dynalyzer A+C BNC connector
Expected: Signal visible on scope channel 1

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

Calibration: Boost time adjustment

Rotor boost time not at specification (1.5 seconds required)

Ranked causes

1. mA/Rotor board R29 requires adjustment (occasional)

First check

Place mA/Rotor board on extender card

Test point: Card extender slot
Expected: Board accessible

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

Calibration: High tension transformer balance radiation

Anode and cathode kV readings unequal, indicating transformer imbalance

Ranked causes

1. Power module center tap requires adjustment for balance (occasional)

First check

Connect dynalyzer Channel 2 to 'C' BNC jack

Test point: Dynalyzer 'C' BNC jack
Expected: Channel 2 connected

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

Calibration: kV adjustment radiation

kV output not within specification at manual mode settings (84 kV, 15 mAs, large focus)

Ranked causes

1. kV regulator adjustment required (common)

First check

Place kV regulator board on extender card

Test point: Card extender slot
Expected: Board seated properly

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

Calibration: kV output radiation

Adjust kV potentiometer to produce correct kilovoltage output at specified parameters

Ranked causes

1. kV PWB requires calibration adjustment (common)

First check

Place kV PWB on card extender with power off

Test point: Card extender slot
Expected: kV (0110) PWB seated

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

Calibration: mA fault limit radiation

mA fault threshold requires adjustment to allow full prep and exposure at highest mA without exceeding limit

Ranked causes

1. mA fault threshold out of adjustment (common)

First check

Measure mA fault threshold voltage

Test point: U23 Pin 10 on mA/Rotor 124-0095G (referenced to TP1 GND on 124-0106G)
Expected: 0.8 VDC
Tools: DCVM

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

Calibration: mA output radiation

Adjust mA rotor PWB to produce correct tube current output within tolerance

Ranked causes

1. mA rotor PWB requires calibration adjustment (common)

First check

Place mA rotor board on card extender

Test point: Card extender slot
Expected: mA rotor (0095) PWB seated

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

Calibration: mAs output radiation

Adjust mAs potentiometer to produce correct millisecond-amperage output within tolerance

Ranked causes

1. mAs PWB requires calibration adjustment (common)

First check

Connect oscilloscope channel 1 to Dynalyzer A+C

Test point: Dynalyzer A+C BNC connector
Expected: Signal present on scope channel 1

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

Calibration: preheat and boost time radiation

Preheat/rotor boost time requires adjustment to proper duration; waveform flatness verified for each tube focal spot

Ranked causes

1. Preheat/boost timing out of adjustment (common)

First check

Measure boost time duration

Test point: TP1 (boost) and TP12 (GND) on 124-0106G
Expected: 1.5 sec
Tools: storage oscilloscope

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

Calibration: Preheat mA radiation

Adjust preheat mA potentiometers to establish correct tube filament heating current

Ranked causes

1. mA rotor PWB preheat requires calibration (common)

First check

Place mA rotor PWB on card extender with power off

Test point: Card extender slot
Expected: mA rotor (0095) PWB seated

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

Calibration: Screen 1 master gain radiation

Screen 1 (200 speed system) requires master gain adjustment via R130 potentiometer at 72, 40, 56, 90, and 125 kV settings to achieve correct image brightness on display

Ranked causes

1. Master gain R130 requires adjustment for each kV setting (common)

First check

Record mAs value at 72 kV with table image receptor

Test point: AEC output
Expected: Initial mAs baseline

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

Calibration: Screen 2 gain adjustment radiation

Screen 2 (400 speed system) gain calibration using appropriate controls and potentiometers for screen 2, following the same procedure as Screen 1

Ranked causes

1. Screen 2 gain requires calibration with screen-specific potentiometers (common)

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

Capacitor bank charged after power disconnection high voltage

SCR capacitor bank retains fatal shock hazard after line disconnect or console power off

Ranked causes

1. Normal capacitor bank charge retention (common)

First check

Verify capacitor bank discharged

Test point: Capacitor bank terminals
Expected: zero volts DC
Tools: DC voltmeter

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

Circuit breaker or fuse undersized high voltage

Insufficient electrical overcurrent protection rating

Ranked causes

1. Breaker/fuse rating below 50% of momentary current (occasional)

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

Control panel not responding to key presses

Defined multi-function keys do not execute expected functions when pressed

Ranked causes

1. Multi-function key undefined or not active in current menu (common)

First check

Verify multi-function key definition on display

Test point: Central display screen adjacent to function key
Expected: Function label visible on display

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

Generator output impaired or insufficient caution

Generator performance degradation when additional circuits powered by same incoming power line

Ranked causes

1. Additional circuits sharing dedicated input line (common)

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

Generator performance impaired

X-ray generator output or operational performance degraded

Ranked causes

1. Shared incoming power line with other equipment (occasional)

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

Improper grounding installation caution

Inadequate or missing earth ground connection

Ranked causes

1. Missing or undersized ground wire (common)

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

Improper line matching transformer installation caution

Line match transformer not installed correctly or in wrong location

Ranked causes

1. Transformer installed under radiographic table (occasional)

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

SCR hold-off time measurement - manual verification high voltage

Technician measures SCR negative pulse at specified test point to verify gate timing control in kV regulator

Ranked causes

1. SCR gate timing requires verification after assembly (common)

Unit does not power on

Control panel indicators do not illuminate and no audible tone is heard during startup

Ranked causes

1. Main power disconnect switch not in 'on' position (common)

First check

Verify main power disconnect switch position

Test point: Main power disconnect switch
Expected: 'on'

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

Error codes

Code	Meaning	Trigger	Severity
`AEC Backup mAs Termination`	Exposure terminated by AEC mAs backup circuitry instead of normal AEC	Exposure continues beyond expected AEC termination, triggering backup mAs limit	warning
`BACKUP mAs`	AEC backup mAs termination fault	AEC exposure terminates when mAs backup circuitry activates	error
`COMMUNICATION-FAULT`	Communication failure between generator and control system	Control circuit or signal transmission failure	error
`GENERATOR`	Generator termination of AEC exposure	Exposure terminates before AEC signal due to generator limits	warning
`Generator Termination of AEC`	Exposure terminated by generator before AEC completion	Generator control limits reached before AEC signal completion	warning
`kV-FAULT`	X-ray generator kilovoltage circuit fault	Generator malfunction in kV output or sensing	error
`mA-FAULT`	X-ray generator milliampere circuit fault	Generator malfunction in mA output or sensing	error

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

Community

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

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