Its 4 relays on this Amplifier.
2 for speakers and 2 for sources.
Speakers Relay are ok.
Maybe one of these 2 relays source has a bad contact?
2 for speakers and 2 for sources.
Speakers Relay are ok.
Maybe one of these 2 relays source has a bad contact?
If a source relay has faulty contacts that could cause the problem .
Is your remote capable of changing the source ?
Is your remote capable of changing the source ?
Using the tape monitor an amplifier uses a different connected audio circuit .
Another poster I was helping -different amplifier but same result had to trace it till he came to the fault , he didn't get back to post the final result of his tracing .
It could be related to the tape monitor switch or mode switch but it still could be a component fault.
Another poster I was helping -different amplifier but same result had to trace it till he came to the fault , he didn't get back to post the final result of his tracing .
It could be related to the tape monitor switch or mode switch but it still could be a component fault.
I tested Sanyo LC78211 with Audio tracer.
No signal on pin 20.Its RCOM3
On pin 11 signal ok it's LCOM3.
All other pins ok
No signal on pin 20.Its RCOM3
On pin 11 signal ok it's LCOM3.
All other pins ok
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Both of those are digitally and physically connected internally and transfer an analogue signal to a digital switched signal thereby operating a system controlled section of the chip .
In other words they take the place of a manual switch using digital intelligence .
I am no expert on digital except where it interfaces with analogue , I am sure somebody here is , but basically if what goes in doesn't come out then the internal switch is not receiving the signal to change it to a digitally closed state or it is receiving it and its not doing its job of transfer and is therefore faulty.
As its a switch ( of sorts ) then try applying the signal to the out pin to see if it then travels to the rest of the amplifier .
There must be some guys here who repair this type of digital switch daily as part of their business who will be more "enlightened " in the field of digital processing than me.
As the guy never came back to say he had found the fault I don't know how much help his post would be , he did eliminate the manual switching sections but his chip wasn't the same as yours although the symptoms are the same.
In other words they take the place of a manual switch using digital intelligence .
I am no expert on digital except where it interfaces with analogue , I am sure somebody here is , but basically if what goes in doesn't come out then the internal switch is not receiving the signal to change it to a digitally closed state or it is receiving it and its not doing its job of transfer and is therefore faulty.
As its a switch ( of sorts ) then try applying the signal to the out pin to see if it then travels to the rest of the amplifier .
There must be some guys here who repair this type of digital switch daily as part of their business who will be more "enlightened " in the field of digital processing than me.
As the guy never came back to say he had found the fault I don't know how much help his post would be , he did eliminate the manual switching sections but his chip wasn't the same as yours although the symptoms are the same.