Was just servicing my old Comtech 800, adjusted the bias and by mistake shorted momentarily heatsink of one channel to the chassis 🙁
After this when turning the amp on protection circuit comes on and cuts the power off to that channel; other channel works normally.
Symptoms are now, when switched on, right channel behaves normal (yellow IOC light comes on, after few sec it goes off and green ODEP lights turns and stays on).
On bad (shorted) channel the yellow IOC light comes on, after few sec the green ODEP light comes on but it immediately switches off while the yellow IOC remains on; this keeps cycling every few seconds.
I looked inside and could not detect any burned component on the output board; also there was no obvious smell/smoke that something burned when I accidentally shorted heatsink to chassis.
I would really appreciate some tips on how to troubleshoot this; there is obviously a protection circuit that turns power off that channel as soon as gets powered, but could not detect anything getting hot.
What would be the first suspected part to get damaged; I got full schematics and wanted to compare L to R channel but it is hard to do as there is no voltage to the bad chanel (it gets cut by power control protection circuit)?
After this when turning the amp on protection circuit comes on and cuts the power off to that channel; other channel works normally.
Symptoms are now, when switched on, right channel behaves normal (yellow IOC light comes on, after few sec it goes off and green ODEP lights turns and stays on).
On bad (shorted) channel the yellow IOC light comes on, after few sec the green ODEP light comes on but it immediately switches off while the yellow IOC remains on; this keeps cycling every few seconds.
I looked inside and could not detect any burned component on the output board; also there was no obvious smell/smoke that something burned when I accidentally shorted heatsink to chassis.
I would really appreciate some tips on how to troubleshoot this; there is obviously a protection circuit that turns power off that channel as soon as gets powered, but could not detect anything getting hot.
What would be the first suspected part to get damaged; I got full schematics and wanted to compare L to R channel but it is hard to do as there is no voltage to the bad chanel (it gets cut by power control protection circuit)?
You will need to check for shouted outputs, driver, pre drivers and even last voltage amp transistors(LVA) on both high and low sides .