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Service Manual
Secondary Operation
The secondary outputs from the transformer will all rise at the same time, 3.3V reach its regulation point first
followed by 5.0V, +21V and 32V.
If the LED is flashing about once every second then a transformer output is shorted to GND or overloaded.
Remove FB610 (33V)
Remove FB607 (+5V)
Remove FB605 (+3V3)
Remove FB608 (+21V)
Once the FB’s are removed check to see if the PSU is stable. The primary waveform will not look ideal as the
previous figure, because the PSU is lightly loaded.
However, the output voltages should be there and stable, if not, check the Feedback loop and primary again.
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