[TenTec] Corsair II AGC issues

[Dave Perrin]

Hi-
 I have a Ten Tec Corsair II that has some AGC and S meter problems:
  AGC toggle switch has no effect at off or slow. At fast it will cycle from no signal to pinned S meter then de-sensed fully and repeat at 5 second intervals with a strong signal. Distorted audio with the same strong signal input.
 On the IF/AF board, number 80984- the 10K pot labeled R1 on the board looks like R59 on the schematic. It should adjust the S meter. The pot. is located on the board about half way across and away from the front panel on the bottom of the rig. On the schematic it is located near the left edge and midway up the schematic. The part measures about 8 Volts on all terminals. It also measures the variable resistance that it should. It has no effect  when adjusted fully. 
 I wonder if different rigs may have different IF/AF boards with different schematics relative to manufacturing dates. Mine is 02739.

 Any ideas or suggestions?

73 de Dave in NH