The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

Well, back to the drawing board!
I changed the cap and now have my full power carrier back but no modulation on AM or SSB. Is there another bad cap somewhere?

Any suggestions?

Thnx

Well here it is. C103(100uf 10v)! I lifted the cap and I now have my carrier back. I Don't know much about the cap, it was a suggestion from a local radio tech. It was shorted. Although it looks like this will fix it I'm not quite certain. If anyone has any details on this cap I would like to know m...

Rick, I tested the transistors and found that the one closest to the radios left side looking from the back at the bottom of the PC board(speaker down)(do you know if this is the final or driver?) is not testing open from the emitter to the collector in one of the polarity directions. It appears tha...

The collector voltage on TR44 is 6.04 RX The collector voltage on TR44 is 5.95 TX. I assume the driver and final are the transistors mounted to the back of the chassis along with TR44? I'm not sure which is which or the transistor #'s or pinouts. Could I do damage to the transistors by checking volt...

Checked the TR44. It tested ok! I'm not seeing the other transistor? If I can find it I'll check it, or is it not nessessary knowing that TR44 in ok? I'm thinking of getting the UNIDEN EXPORT SERVICE MANUAL to help me out. What do you think? Thank you for all time you guys have spent on this problem.

I assume that you mean on the uPC1242H.

Here the measurements are:

Pin 1: .1v (will cause the speaker to hum when checked)
Pin 2: 2.04v
Pin 3: 1.39v
Pin 4: .078v
Pin 5: .093v
Pin 6: 7.03v
Pin 7: 12.77v
Pin 8: 13.78v

Thank you for the reply ramblingman! I checked the audio transformer(the only transformer I see in the radio) and have 13.8v in and 8.2v out, it appears to be working. It also looks like the capacitors are ok as far as I can tell. The 2 large ones next to the transformer are 50v 1000 uf. are these t...

Please Help! Uniden PC244 Symptoms: Radio does not transmit on Am or SSB. The rig does key and still has Rx. Just no output. I don't have a Schematic and not real sure where things are located, like the final Transistor. It is a nice radio and I would really like to fix it. Any direction would be gr...