1981 Delco radio repair
Hello:
A Delco radio from a 1981 Corvette came across my work bench. It must be the top of the line for it's time; it is electronic tuned, and auto reverse cassette. Unfortunately, all the stickers for model and serial numbers have fallen off the radio's case. The complaint is hiss, but no tuning, no display, no music. I applied 12Vdc, and the complaint is correct. The display is dark, and only a small hiss in the speakers. I actually repaired Delco car radios back in the late 1970s when I worked for a local service shop while in high school. I have forgotten much about these, but remember that for the most part, Delco radios were reliable, and generally simple to fix. With this radio, I am not sure where to start. A schematic wouyld be helpful, but I do not havethe model, and do not know where to get schematics. Any advice, and assisatnce is appreciated. Thanks, Bill |
1981 Delco radio repair
billccm wrote in news:1179887619.073718.77600
@w5g2000hsg.googlegroups.com: Hello: A Delco radio from a 1981 Corvette came across my work bench. It must be the top of the line for it's time; it is electronic tuned, and auto reverse cassette. Unfortunately, all the stickers for model and serial numbers have fallen off the radio's case. The complaint is hiss, but no tuning, no display, no music. I applied 12Vdc, and the complaint is correct. The display is dark, and only a small hiss in the speakers. I actually repaired Delco car radios back in the late 1970s when I worked for a local service shop while in high school. I have forgotten much about these, but remember that for the most part, Delco radios were reliable, and generally simple to fix. With this radio, I am not sure where to start. A schematic wouyld be helpful, but I do not havethe model, and do not know where to get schematics. Any advice, and assisatnce is appreciated. Thanks, Bill Check the 5V regulator on the ETR board. Also, you need to feed it continuous 12V on the separate two connector lead, on the orange wire. |
1981 Delco radio repair
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1981 Delco radio repair
"Art" wrote in
: Look for a DC-DC inverter circuit that has failed. If memory serves me the DC-DC developed supply voltages both for the tuning and display circuitry. Tuning comes right from 5V or 12V. VFD displays would have a DC-DC convertor, and I don't think they had them back then. It wasn't till 1985/6/7 or so when they went to VFD for their premium stereos, I think. Before that, they used LED. |
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