With a PC and XRGSCOPE:
select error # from error log index list, select error details and
read screen Error: HW Set Values to get Z nominal,
then read Error: Specific Information to get the faulty value.
Check supply voltages EZ130
- + 5V X2:AC1 X2:AC2
- +15V X2:AC11
- - 15V X2:AC12
- +26V X2:AC14
against ground X2:AC15
If all supplies OK replace PCB
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