AMX Troubleshooting & Technical Support

1) If error 437 occurs after exposure, check HV Transformer Tank spark gaps (0.010”) or the X-ray Tube (XRT) may be spitting. 2) If error 437 occurs other than during or after an exposure, the X-RAY ON signal may be active (as during pickup of drive handle or while driving) 3) Check snubbers across drive relays 4) Static problems (units prior to oct. 1993) order ESD kit part # 46-329334G1 (Refer to Service Note 3411) CPU Board should be 46-264974G1 or later and Filament kVp Control Board should be 46-264986G1 or Later). Measure Drive Wheels to Ground = 8 -10K but not >25K, Wheel shaft to Ground = 5 -10 Ohms 5) Poor connection to RC Filter across Power Module SCR Q3 Power Pack/Block 6) Poor Safety Contactor operation during PREP (Safety Contactor or Microswitch are bad) 7) Insulate (on older Units) Capacitor C5 from its retaining clamp (Refer to Service Note 3265) 8) Defective CPU Board 9) Poor connections(s); Battery leads, Tap relays, etc. 10) Poor pin spread on High Voltage Cables 11) Bad Battery Charger Board 12. Bad Drive Handle Assembly/Drive Handle enable switches—Injecting Noise into CPU Board (Also XRAY And SONALERT may activate) 13) No Diode across coil of K1 Safety Contactor coil (Overall Schematic Sheet #2, Loc. 7-F). CQA 943970 14) During CAL GENERATOR, kVp Cal - make sure jumper between TP-14 and TP-15 is NOT open

Check backup timer/status signal and CPU critical-status input.

Note: Will also cause light films 1) Recalibrate CAL GENERATOR portion only if the exposure time is longer than 2 ms and the kVp is less than or equal to 75% of selected kVp 2) Check that K7 Safety Contactor on AMX1 A4 panel closes (Contacts welded/loose Leads/Bad coil) Verify proper Microswitch (Aux) closure (K7 Safety Contactor is orderable Part # 46-262695P5). A faulty K7 Safety Contactor, might not give any errors—but you will not be able to CAL BATT CHARGER portion in the Calibration mode. As a rule, if the unit was manufactured prior to June 1994, REPLACE the Safety Contactor assembly (order part # 46-262695P5) 3) Filament kVp Board may be defective 4) 1 KHz Inverter Board may be defective 5) Loose connectors on Filament kVp Board or 1 KHz Inverter Board 6) Stop/Start Power Module SCR 800V 200A, Q3 on AMX1 A4 panel may be defective 7) If EXP START Is shaky or Hi all the time (it should be a pulse), troubleshoot the EXP START CMND circuit on the 1 KHz Inverter Board 8) Verify that the tap relays contacts are coming in firmly. No external interference (Check fish-paper is not loose/curled on inside side panel cover, replace fish-paper with 3M mylar insulator orderable part # 46-315281P1 or 2801253) 9) Loose leads on service toggle switch (not going to applications) 10) Defective CPU Board 11) Defective Rotor Control Board 12) Bad High Voltage Tank Transformer 13) Loose Anode or Cathode High Voltage Cable-spread pins at both ends of Anode and Cathode HV Cables 14) P1/P2 leads exhibit leakage to ground 15) 439 and 462 Errors together indicate battery/cell problems 16) 439 and 43E Errors - replace Filament kVp Board and/or 1 KHz Inverter Driver Boards - check filament High Voltage cables 17) AMX1 A4 C5 leaky to ground 18) Refer to item 19 in 469 Error listing 19) AMX1 A4 C6 bad (Filament kVp Board J8 Pins 1 & 2) 20) Check for weak (“soft”) batteries/cells. 21) Bad main Power Module SCR(s) Q1 Or Q2 blocks 22) Bad AMX1 A4 R7 (Auto-Transformer) 23) Bad tap relay(s) – Check the K6 tap relay for good normally closed contacts

Check start command, inverter start, HV output and X-RAY ON status path.

Check rotor interlock signal, CPU critical-status input and generator-control feedback.