Post by capn357 on Feb 25, 2017 11:11:05 GMT -5
So I just picked up a hand-wired D201 from Ebay. I probably paid too much for it, but I was anxious to get my hands on one of these. The unit worked fine when it arrived, but of course, I couldn't let well enough be alone and decided to clean the dust out of the inside. Despite my best efforts to be careful, I evidently broke something because now the manual receive is completely dead. Not intermittent, not weak, and not off frequency; it is dead. Crystal side works fine on both receive and transmit.
I've looked for the obvious loose wire that may have resulted from my mucking around in there, but I can't find anything. I also swapped out the tube for V302, but no joy.
Does anyone know where I can obtain a service manual for the hand-wired version? I have the schematic (it came with the unit), but I don't have the service manual. I do have the service manual for the D201A (that's easily found online), but I figure there are obviously some differences between the hand-wired unit and the PCB-based unit.
Update 3/20: After many hours looking here and there, I finally found the issue. There was a short at a terminal panel that effectively shorted out the pin 7 and pin 8 circuits of V302B. Once the short was eliminated, everything on the manual receive (and transmit) functioned just fine. My joy was short-lived, however, as another unrelated audio hum problem surfaced within 10 minutes of the fix. That's the way these old radios are, I suppose.
I've looked for the obvious loose wire that may have resulted from my mucking around in there, but I can't find anything. I also swapped out the tube for V302, but no joy.
Does anyone know where I can obtain a service manual for the hand-wired version? I have the schematic (it came with the unit), but I don't have the service manual. I do have the service manual for the D201A (that's easily found online), but I figure there are obviously some differences between the hand-wired unit and the PCB-based unit.
Update 3/20: After many hours looking here and there, I finally found the issue. There was a short at a terminal panel that effectively shorted out the pin 7 and pin 8 circuits of V302B. Once the short was eliminated, everything on the manual receive (and transmit) functioned just fine. My joy was short-lived, however, as another unrelated audio hum problem surfaced within 10 minutes of the fix. That's the way these old radios are, I suppose.
