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Troubleshooting AMX
Error Number
Error 45C
Error Code / System Message
45C
Error Question
What should I check for error 45C on the AMX-4 Series?
Short Answer
1. Check for 80 VAC At CR4 Black Leads On AMX1A4 Panel With PREP Pressed 2. Check for About 75 VDC Across AMX1A4 C2/C12 With PREP Pressed 3. Check for Correct Polarity Of CR1 & CR2 (CR7/CR13) On AMX1A4 Panel 4. Bad 1 kHz inverter Driver Board 5. Are The Tap Relays Energizing? 6. Is “Stop Cap” At J4-11 (1 kHz Inverter Driver Board) Approximately 80 VDC?
Possible Causes
1. Check for 80 VAC At CR4 Black Leads On AMX1A4 Panel With PREP Pressed 2. Check for About 75 VDC Across AMX1A4 C2/C12 With PREP Pressed 3. Check for Correct Polarity Of CR1 & CR2 (CR7/CR13) On AMX1A4 Panel 4. Bad 1 kHz inverter Driver Board 5. Are The Tap Relays Energizing? 6. Is “Stop Cap” At J4-11 (1 kHz Inverter Driver Board) Approximately 80 VDC?
Troubleshooting Steps
1. Check for 80 VAC At CR4 Black Leads On AMX1A4 Panel With PREP Pressed 2. Check for About 75 VDC Across AMX1A4 C2/C12 With PREP Pressed 3. Check for Correct Polarity Of CR1 & CR2 (CR7/CR13) On AMX1A4 Panel 4. Bad 1 kHz inverter Driver Board 5. Are The Tap Relays Energizing? 6. Is “Stop Cap” At J4-11 (1 kHz Inverter Driver Board) Approximately 80 VDC?
Parts Areas to Check
1 KHZ Inverter Driver Board; Tap Relay
For Related Models
AMX-4, AMX-4+, Definium AMX 700
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