Static electricity shorted out channel on stereo....

[David Bean]

I bought a late 70's Sanyo am/fm/cassette/turntable on eBay about 6 months ago. The guy who sold it to me cleaned and lubed to near perfection. It's in great condition and plays well.

Today I went to turn it down and when I touched the volume knob I felt a shock of static electricity. Ever since then one of the channels won't work. I initially thought it was the speaker, but i switched speaker cables and they both work on the one channel, but not the other.

Could static have done this? What would likely be the remedy?

Thanks in advance!!!!!!!!

 

[whit3rd]

On Friday, March 6, 2015 at 10:56:23 AM UTC-8, David Bean wrote:

I bought a late 70's Sanyo am/fm/cassette/turntable...
Today I went to turn it down and when I touched the volume knob I felt a shock of static electricity. Ever since then one of the channels won't work.. I initially thought it was the speaker, but i switched speaker cables and they both work on the one channel, but not the other.

Could static have done this? What would likely be the remedy?

A static discharge to a knob would probably go straight to the mechanical chassis
(steel bracket that the knob's axle goes through). So, it's unlikely to be the cause
of a one-channel dropout.

If you haven't already done it, exercise all the switches (speaker select, mono/stereo,
selector, muting, tape monitor...) that you can see. If that doesn't fix it,
there could be an electronic component failure (needs a technician's TLC).
Some quick diagnostics: does the nonperforming speaker have any background
hiss or hum? And, is there any DC voltage on the speaker terminals? Can you
hear anything through a headphone jack?

 

[Maynard A. Philbrook Jr.]

In article <8a9332fe-33cf-4732-8c2c-5f3a80220dc4@googlegroups.com>,
davidtn@gmail.com says...

I bought a late 70's Sanyo am/fm/cassette/turntable on eBay about 6 months ago. The guy who sold it to me cleaned and lubed to near perfection. It's in great condition and plays well.

Today I went to turn it down and when I touched the volume knob I felt a shock of static electricity. Ever since then one of the channels won't work. I initially thought it was the speaker, but i switched speaker cables and they both work on the one channel, but not the other.

Could static have done this? What would likely be the remedy?

Thanks in advance!!!!!!!!

if the pot has a metal shaft and the pot isn't mounted to the chassis
but just soldered to the circuit board, yes, it is possible to damage
the circuit where the pot is connected to.

You see pots can get dirty over the years and two things can happen,
you lose the good electrical bond between the shaft of the pot to the
bushing or the bushing isn't grounded, or you don't have a grounded plug
on the system..

I would check the circuit the pot is connected to.

Jamie

 

[Chuck]

On Fri, 6 Mar 2015 10:56:20 -0800 (PST), David Bean
<davidtn@gmail.com> wrote:

I bought a late 70's Sanyo am/fm/cassette/turntable on eBay about 6 months ago. The guy who sold it to me cleaned and lubed to near perfection. It's in great condition and plays well.

Today I went to turn it down and when I touched the volume knob I felt a shock of static electricity. Ever since then one of the channels won't work. I initially thought it was the speaker, but i switched speaker cables and they both work on the one channel, but not the other.

Could static have done this? What would likely be the remedy?

Thanks in advance!!!!!!!!

Yes, static electricity could easily damage ics or mute transistors
back then. There was a Pioneer car radio back then that had rf
capacitors and transistor that would short if someone with a static
charge touched the antenna. Hitachi had a line of televisions where
the microprocessor would die if the keys on the front of the set were
touched by a person with a static charge. My guess is that there is a
solid state component that will need to be replaced.

---
This email has been checked for viruses by Avast antivirus software.
http://www.avast.com