1981 Delco radio repair
 

On May 23, 7:57 am, Gary Tait wrote:
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.- Hide quoted text -

- Show quoted text -
Hey, Thanks Gary. I thought that might be a separate connector for the
power antenna. So I need to apply 12Vdc on both the input socket and
separate two conductor connector?

Any sources for a schematic?

Thanks again for your time, Bill

1981 Delco radio repair
 

billccm wrote in
oups.com:

On May 23, 7:57 am, Gary Tait wrote:
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.- Hide quoted text -

- Show quoted text -
Hey, Thanks Gary. I thought that might be a separate connector for the
power antenna. So I need to apply 12Vdc on both the input socket and
separate two conductor connector?


Yes. The orange wire is to power the continuos power from the radio. It
comes off the convenience circuit in the vehicle.

Any sources for a schematic?

Nope. I just play it by ear (so to speak). I have had my hands in a
number of the Delco ETR radios from the 1980s (as well as a number of
PLL and analog tuned low to mid end aftermarket car stereos), and the
are all fundamentally the same.


Thanks again for your time, Bill