AM/FM trouble shooting - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

 
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post #1 of 8 (permalink) Old Feb 5th, 03, 01:41 PM Thread Starter
 
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I have a 68 with a AM/FM mono radio. Even with the volume at max you can barely hear a whisper out of it. Initially it was intermitent. I could only get any volume out of it with it at max, but the volume would cut in and out. I would have to rap on the dash to get the volume to kick back in. This intermitent situation lasted about a hour before it went to a contant whisper. I have clear reception, there isn't any static.

I initially thought it was a bad connection or short. So, I got a hold of the harness at the rear and jiggled the wires. No luck. I then unplugged and cleaned the connections. No luck. Now, I think it might be that the amp failed. Any ideas of what the problem is and how to fix it?

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post #2 of 8 (permalink) Old Feb 5th, 03, 04:37 PM
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No way to tell without diagnosing the circuit. However, I'd recommend inspecting the internal solder joints and resoldering anything that looks dull or even cracked. In particular, look for 'large-lead' componenets. Test points, transformer leads, power transistors, etc. that have large leads tend to have cold joints which will crack over time. Also look for fryed resistors, capacitors with bulging bottoms or capacitors that are oozing electrolite. Beyond these visual types of things, it will probably require a DVM, O-scope, and schematic to troubleshoot failed components etc.

-dnult
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post #3 of 8 (permalink) Old Feb 5th, 03, 06:11 PM
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When I pulled mine and checked it out, it turned out to be the small round item (not sure what it is called) in the back.

I pulled out the retaining screw and pulled the round plug out of the back. Cleaned the prongs (looked a little like a vacuum tube plug) and re-installed. Works fine now...

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Steve - Central Ohio Camaro Club
'69 Camaro RS/SS-350 - Daytona Yellow
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post #4 of 8 (permalink) Old Feb 6th, 03, 02:02 AM
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Go to Radio Shack and buy a can of RF Tuner Spray.

Return to car and remove radio from car. Take spray and inject inside of volume control pot located right behind knob. Turn knob in its full rotation several times. Spray, turn, spray, turn, etc. Let it dry, about 10-15 min. Pull harness out, hookup radio and try again.

If volume comes back, assemble car. If not, follow dnult's suggestion.

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Everett "OBJECTS IN THE MIRROR APPEAR QUICKLY UPON RAPID DECELERATION"
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post #5 of 8 (permalink) Old Feb 6th, 03, 05:39 AM
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Your antenna base needs a better ground.
McCorry was working in the right area, at the back of the radio,
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post #6 of 8 (permalink) Old Feb 6th, 03, 01:51 PM
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All very good suggestions. 30 years will cause all sorts of gremlin problems like bad connections and dusty potentiometers. Start with the cheap and simple stuff.

-dnult
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post #7 of 8 (permalink) Old Feb 14th, 03, 01:14 PM
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So, did you get it to work?

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Steve - Central Ohio Camaro Club
'69 Camaro RS/SS-350 - Daytona Yellow
'95 Camaro Z-28 - Sebring Silver
click here to see my webpage ---> My Camaros (updated 2/14/03)
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post #8 of 8 (permalink) Old Feb 14th, 03, 01:51 PM
 
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did you by chance check the speaker wires? sounds exactly like a problem I had before. My wires had become loose right at the speaker and i would bang on the dash and it would work for a while. Just a thought
Scott

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Scotts 67
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