[MRMNW]

Hi,
The unit has been working fine up until recently, now the makeup gain does nothing. 

I'm getting a reading of -1.42v at TP12 as per step 1.2 on the voltage checks and it doesn't change when moving the makeup gain on step 1.3.

Any help appreciated

Thanks

[JPK]

Check if the center pin of P2 (makeup) goes from 0 to +12VDC when moving.
Next check that this voltage reaches R90 and U22 pin7 (with less amplitude 0-2V4).

[MRMNW]

Thank you

Yes to both of these

[MRMNW]

Anything else I can check?