I have GE AMX 4, test 4 failed. Went to service mode, reset system and it blew fuse F93 on Rotor control board. Now, it gives an alarm continueously and the controller board lights at D17. I suspect faulty FETs on A3 A2 board. Any help? Thank you
Test 4 failing is due to a calibration checksum failure. Did you check in the calibration section of the service mode which calibration is failing?
Likely the F93 failure on the rotor controller is due to a bad (shorted) FET on the board. This can be checked and these can be sourced and replaced without resorting to replacing the entire board. As the 60 Hz inverter on the rotor controller also powers the collimator lamp, another cause for this fuse blowing may be a short circuit in the wiring to the collimator.
The source signal for the 60 Hz inverter on the rotor controller board originates on the CPU (controller) board. I have occasionally seen this cause issues.
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joe ssali
AMX 4
September 13, 2013 11:36
I have GE AMX 4, test 4 failed. Went to service mode, reset system and it blew fuse F93 on Rotor control board. Now, it gives an alarm continueously and the controller board lights at D17. I suspect faulty FETs on A3 A2 board. Any help? Thank you
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LUIS RIVAS
re: AMX 4
September 14, 2013 09:36
Yes may be the fet on rotor board then you repair it must calibrate and the test 4 failed dissappear
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Juan de la Cruz Martinez
re: AMX 4
September 14, 2013 09:37
Normally the CPU pcb will cause this problem. You probably need to replace the CPU board and the rotor controller
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Joseph Lovett
re: AMX 4
September 16, 2013 08:29
Test 4 failing is due to a calibration checksum failure. Did you check in the calibration section of the service mode which calibration is failing?
Likely the F93 failure on the rotor controller is due to a bad (shorted) FET on the board. This can be checked and these can be sourced and replaced without resorting to replacing the entire board. As the 60 Hz inverter on the rotor controller also powers the collimator lamp, another cause for this fuse blowing may be a short circuit in the wiring to the collimator.
The source signal for the 60 Hz inverter on the rotor controller board originates on the CPU (controller) board. I have occasionally seen this cause issues.
I hope this helps you with your troubleshooting.
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