Umatic 7600 playback video/audio issue?

[jham55]

I have not come across this problem before but the umatic loads and plays fine and the meters are picking up the signal. There is no audio or video though. So far I have tried the following
1. changed the drum assembly
2. cleaned the heads
3. The deck was already really clean but I cleaned the inside really well
4. Changed tapes

same issues.. nothing seems to get video or audio.