Did you check the RCA shields on the sony for continuity to ground?
Was the sony being used with the alpine at one time?
If the alpine had an intermittently shorted transformer, that could cause it to damage head units.
With no signal to the RCA inputs, measure the voltage from the primary ground to the RCA shields. If it's 0v, try twisting, pushing, pulling on the transformers to see if the voltage ever goes higher than a fraction of a volt.
Was the sony being used with the alpine at one time?
If the alpine had an intermittently shorted transformer, that could cause it to damage head units.
With no signal to the RCA inputs, measure the voltage from the primary ground to the RCA shields. If it's 0v, try twisting, pushing, pulling on the transformers to see if the voltage ever goes higher than a fraction of a volt.
I will check after work tonight. Thank you.
Do you know what gauge the transformer windings are? I might want to grab some transformer wire before leaving work in case I have to rewind.
Do you know what gauge the transformer windings are? I might want to grab some transformer wire before leaving work in case I have to rewind.
I don't know. Let's hope it doesn't come to that. Most intermittent shorts are where the terminal windings meet the rest of the windings and a simple insulator properly placed can eliminate the short.