Sansui 7070 “ Just Take It”

Sharpstik

Stuck in the 70's
What am I doing in the Sansui forum ?
Anyway , it’s raining some , but there’s a yard sale nearby in a nice area so I’ll go. Nice stuff . There’s 4 gals running it . I pick up an old aquarium light , one of them asks “ Do you like electronics”? Well do have any old audio gear ,? I pose the question .. “
She stares ahead ..” Yeah I do , We don’t use it anymore. Come downstairs”. .
This one was on its side . She thought it might have been a Kenwood. “Just take it”.
I lug it upstairs, there’s a box of cords , speaker wire and such . The speaker wire leaves with me .
I can’t just take this ... husband doesn’t even look up. I throw her a 10 for her kindness .
She’ll look for the manual, too.
First a Pioneer , now this one.
Fixed the two blinking lamps with some DeOxit .
Volume sometimes fades away to silence when played at a low volume. What would cause that?
 

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Nice score!

I'd start by cleaning all the pots and switches with deoxit contact cleaner. (With the unit unplugged of course.)

EDIT: Never mind. Just re-read your post.
 
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Volume sometimes fades away to silence when played at a low volume. What would cause that?
Does the volume return if you crank up the volume? If so. Protect relay, cold solder connection or dirty speaker select switches.
 
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I’ve hit the speaker selector switch . Twice .
Protect relay contacts or solder connections or dirty speaker select switch.
Is the relay right by the on/ off button .? I didn’t hit that . I’ll try the loudness switch too .
 
When it starts to fade at low volume. Tap on the relay cover.And note any change in sound volume or quality.
Does the volume return if you crank up the volume?
The telltale symptom of a relay issue.80-90% of the time
 
When it starts to fade at low volume. Tap on the relay cover.And note any change in sound volume or quality.

The telltale symptom of a relay issue.80-90% of the time
I'd do that if I knew what the relay looked like.
I'll go find it.
 
I believe its located under that black center cover........Standby
index.php
 
Correct^^^ it is labelled RL01, and can be seen on the board layout diagram on page 8 of the Service Manual.
 
Located on the F-2625 board and likely looks like this.
LY2-0-DC100%5E110_sml.jpg
Correct^^^ it is labelled RL01, and can be seen on the board layout diagram on page 8 of the Service Manual.
This ?
says RABK 2 B on the plastic cover .
That thing needs deoxit ? It’s covered .Does it even come off ?
 

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So, is there any way to clean these relays or is it a replacement? I have a similar problem with an NEC preamp. At low volume one channel can drop out, I crank up the volume and it comes back. It's all logic controls, no physical speaker selector or source switches on the front, just pushbuttons that scroll through the choices. This relay problem sounds like the culprit.

Sorry for the tangent, or maybe hopping onto your wagon is a more appropriate term.
 
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