I have an MRV f400 with channel 2 down,
here's a list of areas tested so far
no dc on channel 2
no audio when channel 2 bridged with channel 1 via the correct terminals
Input phono's tested for continuity -all good
Input continuity on channel 2 tested up to KIA6259S OP amp
Input switches tested - working fine
Tried pushing board down on various locations with speaker connected to channel 2 it made no difference.
Amp is stable idling fine and plays perfect on all other channels
any help with this appreciated, thanks
here's a list of areas tested so far
no dc on channel 2
no audio when channel 2 bridged with channel 1 via the correct terminals
Input phono's tested for continuity -all good
Input continuity on channel 2 tested up to KIA6259S OP amp
Input switches tested - working fine
Tried pushing board down on various locations with speaker connected to channel 2 it made no difference.
Amp is stable idling fine and plays perfect on all other channels
any help with this appreciated, thanks
If you have audio on all 4 outputs of IC301 and 302, do you have audio on the emitters of all 4 muting transistors?
Turned out it was cold solder joints on the dual 5w resistors, I had a similar problem with a Sony amp which also had the same symptoms so I re-run the solder on all 4 resisitors and it works fine now.
Thank you all for your replies and input, much appreciated.
Thank you all for your replies and input, much appreciated.