Hello. my first post for a long while so hoping somerone can help me.
I have powered up this rig after many years in (dry!) storage.
I was vey encouraged when in the "Tune" mode I obtained 120W out into a dummy load.
Obtained 120W out on CW and about 50W am - all to specification.
Then I tried SSB (LSB on 40 meters). In order to set up the correct microphone gain I have to switch to LSB mode with the meter set to ALC. On key up the meter should read about full scale - but it doesn't move off zero! So I can't get to the stasge of adjusting the mic. gain to get correct level of modulation.
I have copies the user manual and the service manual.
This exact fault is actually described in the service manual (page 4-8) with relevant circuits (pages 4-9 and 4-10).
However I have found that these circuit diagrams are ambiguous and in one case completely incorrect.
One solution suggests "grounding the anode of D2 which can restore SSB". Fine - but which D2? The "D2" shown for the "RF speech processor" (Board PB 1534) is clearly nothing to do with the SSB circuit although D3 on that board is connected to the ALC line.
I wondered if the "D2" mentioned for shorting anode to ground is the D2 in the grid circuitry of V2?
I didn't want to short this to ground without some advice! so That is my query!
Many thanks for any thoughts/suggestions.
Peter G0LQU
