Ok, so the left channel uses through hole variable resistors to manage the output while the right channel uses a static series of resistors.
There is a 500 ohm (RV307) VR for the deck left channel and a 5k ohm (RV308) VR for the left VU meter.
In my case, both of these were dead but if the left VU does not work on deck only then it is likely to be the decks left channel variable resistor RV307. If the left VU doesn't work at all, then the RV308 may be dead, or both could be shot.
They are both located on the main amp board beneath the deck, the VU is located close to where the VU leads attach to the board and the deck one is located to the right of the deck and can be seen without removing the deck. (See above pictures for RV307).
To test, simply put an ohm test across the two ends to see it's resistance. Mine both showed no reading (OL).
Replacing these should resolve this specific issue.
My unit (and has been alluded to earlier in the thread) has additional related issues whereby the balance does not affect the output properly. I think that the issue is related to the bass slider but it needs taking out the board to be sure. It looks to me like these are very common issues on this unit and to be honest, is a massive pain to resolve.
In addition to this, the deck is a mare, after taking it apart and replacing belts, I have an issue with the placement of the cassette and audio output, perhaps a sensor issue?
There is a 500 ohm (RV307) VR for the deck left channel and a 5k ohm (RV308) VR for the left VU meter.
In my case, both of these were dead but if the left VU does not work on deck only then it is likely to be the decks left channel variable resistor RV307. If the left VU doesn't work at all, then the RV308 may be dead, or both could be shot.
They are both located on the main amp board beneath the deck, the VU is located close to where the VU leads attach to the board and the deck one is located to the right of the deck and can be seen without removing the deck. (See above pictures for RV307).
To test, simply put an ohm test across the two ends to see it's resistance. Mine both showed no reading (OL).
Replacing these should resolve this specific issue.
My unit (and has been alluded to earlier in the thread) has additional related issues whereby the balance does not affect the output properly. I think that the issue is related to the bass slider but it needs taking out the board to be sure. It looks to me like these are very common issues on this unit and to be honest, is a massive pain to resolve.
In addition to this, the deck is a mare, after taking it apart and replacing belts, I have an issue with the placement of the cassette and audio output, perhaps a sensor issue?
