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Troubleshooting AMX
Error Number
Error 443
Error Code / System Message
443
Error Question
What should I check for error 443 on the AMX-4 Series?
Short Answer
1. If Power Module SCR Q3 block was replaced in the field, black/white leads to Q3 block on AMX1 A4 panel are reversed between G1/K1 and G2/K2 2. Check for miswired plug at J4 on 1 KHz Inverter Board 3. Check EXP STOP CMND circuit on 1 KHz Inverter Board. EXP STOP CMND and SCR Hi/Lo are single pulses 4. Defective 1 KHz Inverter Board 5. Defective Power Module SCR Q3 block on AMX1 A4 panel
Possible Causes
1. If Power Module SCR Q3 block was replaced in the field, black/white leads to Q3 block on AMX1 A4 panel are reversed between G1/K1 and G2/K2 2. Check for miswired plug at J4 on 1 KHz Inverter Board 3. Check EXP STOP CMND circuit on 1 KHz Inverter Board. EXP STOP CMND and SCR Hi/Lo are single pulses 4. Defective 1 KHz Inverter Board 5. Defective Power Module SCR Q3 block on AMX1 A4 panel
Troubleshooting Steps
1. If Power Module SCR Q3 block was replaced in the field, black/white leads to Q3 block on AMX1 A4 panel are reversed between G1/K1 and G2/K2 2. Check for miswired plug at J4 on 1 KHz Inverter Board 3. Check EXP STOP CMND circuit on 1 KHz Inverter Board. EXP STOP CMND and SCR Hi/Lo are single pulses 4. Defective 1 KHz Inverter Board 5. Defective Power Module SCR Q3 block on AMX1 A4 panel 6)Bad CPU, 1 kHz, and or Rotor Board. If a good CPU was used to test and still show same error, possible bad K7 Safety Contactor
Parts Areas to Check
1 kHz Inverter Board; Power Module SCR Q3
For Related Models
AMX-4, AMX-4+, Definium AMX 700
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