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

OK Rick, thats what I needed to know. I'll go do that right now and get back

Heres what I did. I checked all channels with Dosy frequency counter and watt meter. 6 or 7 channels were off frequency I re-soldered the joints at the channel switch and rechecked the frequencies. They are all right on now. Heres the crazy thing - The watt meter is lowest on channel 1 at less than ...

This Cobra dead keys at about 4 watts on the upper 20 channels but below channel 20 it starts to drop in output watts all the way down to about <1watt on channel one. Also the channel indicator does not light up completely. I suspect it may be a problem with the uPD858c PLL How do you test the PLL c...

Thanks for sending the owners manual RICK. I though the scan was suppose to serch for busy channels. The manual you sent says that the scan serches for vacant channels. I guess back in the day, CB was so active that it difficult to find an empty channel. THANKS AGAIN RICK! The radio works perfect no...

Rick, That sure sounds right to me. I tried it but no go. It won't scan unless I turn the squalch so its noisy. I never did check the other caps. Do you think that there might be another bad cap?

Merry Christmas to you and your family Rick and thanks so much for all your help. Three cheers for ya You really know your stuff !! And Merry Christmas to all here at RadioMods

:D :D :D :D RICK!! Good news !! I tested the 6 diodes you told me to check.All seemed OK, to me anyway. D206 (.388) D207 (.314) D208 (.427) D209 (.586) D210 (.592) .. I then went to the caps you told me to check. I only found two so far. the first C221 measured 5.3u and C223 didn't check right. I re...

Thanks for the link NOMADRADIO, And thanks for sending the origional schematic for the SBE40CB RICK ! Its not fixed yet but I am confident that we are on the right track.

James, isn't the uniden madison the same or similar as that cobra 148?

I am a new kid on the block but it sounds to me like you blew one of the outputs. Some radios have one output, some have two. I am not familiar with cobra 200. Possably a 2sc1969 output? If my puter was up to par, I would look it up for you.

L202 checks ok R406 9.5v & 2.76v

TR 402 E- .0 ccw 1.31 cw 2sc710
C- 2.77 .47
B- .01 .44


TR403 E- .68 ccw .47 cw 2sc710
C- .66 1.06
B- .o1 .44

TR 402 E- .0 ccw 1.31 cw 2sc710 C- 2.77 .47 B- .01 .44 TR403 E- .68 ccw .47 cw 2sc710 C- .66 1.06 B- .o1 .44 :) BTW, thank you for the warm welcome. If I had a bloody schematic or a service manual it would sure make things a bloody bit more easy.

Hi Rick! Been reading lots of good things about you here.
TR803 (2sc1014) Emitter shows 9.55vdc
Can't seem to locate tr402 & 403. (still looking)
Signal on s meter is good

Greetings fello CB'ers and Techs. This is my first post, I just joined. Problem is, I just purchased a SBE console V -aka "sbe40cb". The transmit on ssb and am is fine and the receive on ssb is also ok. But the AM receive is very low, even at full volume. Also the scan seems to function bu...