Decided that after having it not work for over 5 years, I'd take a look at my dad's Uniden PC76XL CB Radio since I have a better understanding of electronics than I did when I was 15.
Problems:
-Parts of the channel LCD fade in and out from time to time. I am not worried about this at all UNLESS it is a symptom or the cause of the root problem.
-Unit doesn't seem to broadcast or receive transmissions.
What I know:
-Unit successfully powers on. Currently powering it with the 12v lead off of a PC PSU.
-Internal speaker works, external CB and PA outputs also function, HOWEVER I am not sure if they function properly (as in if whatever controls them is malfunctioning).
He's using a "Lil' Wil" Wilson antenna and an Astatic D104-M6B mic. On the antenna, part of the tip of the pin is broken off, but has been tinned on the broken bit to protect it. I am not sure if the mic works or not.
In fact, my dad and I are both wondering if the mic is the cause of the problem. We both don't know if a CB will work without a mic/without a functioning one. When I plug my headphones into the PA output jack, I hear a faint hum, then when I click the mic in the hum fades out (think the cliche "power stations dieing during a blackout" from all movies) and then nothing. He has a 2nd mic, but we have no idea where it is. Within the next few days I'll be pulling the mic apart to check the continuity of all of the components in it.
The squelch appears to work - static when it is turned all the way down, and it is reduced/eliminated when you turn it up (only hear the hum). Not sure if mic gain works. RF gain makes the static louder, so maybe it IS receiving. I have -NO IDEA- what delta tune does. SWR gauge lights up but doesn't move regardless of what the SWR CAL knob reads, whether I am "attempting" to broadcast or not. the RX/TX light is on when listening, dims a bit and the "ANT" light lights up when I try to broadcast. CH9/Normal switch works as expected. BRT/DIM switch brightens or dims the channel display, as expected - but has an effect on the pitch of the hum. CB/PA switch works. I have no idea what the "NB/ANL"/"ANL"/"OFF" and "S/RF"/"SWR"/"CAL" switches do (two three-position switches).
Anyone here got some input for me? I would LOVE to get this working again for him, he'd really like this... I hope we have some CB pros here who can help
Problems:
-Parts of the channel LCD fade in and out from time to time. I am not worried about this at all UNLESS it is a symptom or the cause of the root problem.
-Unit doesn't seem to broadcast or receive transmissions.
What I know:
-Unit successfully powers on. Currently powering it with the 12v lead off of a PC PSU.
-Internal speaker works, external CB and PA outputs also function, HOWEVER I am not sure if they function properly (as in if whatever controls them is malfunctioning).
He's using a "Lil' Wil" Wilson antenna and an Astatic D104-M6B mic. On the antenna, part of the tip of the pin is broken off, but has been tinned on the broken bit to protect it. I am not sure if the mic works or not.
In fact, my dad and I are both wondering if the mic is the cause of the problem. We both don't know if a CB will work without a mic/without a functioning one. When I plug my headphones into the PA output jack, I hear a faint hum, then when I click the mic in the hum fades out (think the cliche "power stations dieing during a blackout" from all movies) and then nothing. He has a 2nd mic, but we have no idea where it is. Within the next few days I'll be pulling the mic apart to check the continuity of all of the components in it.
The squelch appears to work - static when it is turned all the way down, and it is reduced/eliminated when you turn it up (only hear the hum). Not sure if mic gain works. RF gain makes the static louder, so maybe it IS receiving. I have -NO IDEA- what delta tune does. SWR gauge lights up but doesn't move regardless of what the SWR CAL knob reads, whether I am "attempting" to broadcast or not. the RX/TX light is on when listening, dims a bit and the "ANT" light lights up when I try to broadcast. CH9/Normal switch works as expected. BRT/DIM switch brightens or dims the channel display, as expected - but has an effect on the pitch of the hum. CB/PA switch works. I have no idea what the "NB/ANL"/"ANL"/"OFF" and "S/RF"/"SWR"/"CAL" switches do (two three-position switches).
Anyone here got some input for me? I would LOVE to get this working again for him, he'd really like this... I hope we have some CB pros here who can help