pioneer sx1080 help...

ok...blow by blow....i resprayed the tape mon 2 switch again...this is my second can of contact cleaner used on this thing...
the switch does now pin out correctly.....
but, still no change....no hum on pin 23....or beyond
butt, something i did notice....when i touch the balance control....i get a light hum....similar to the red hums before
when i touch the metal shaft on the volume control...i get a loud hum....similar to the green hums before...
 
under the tape 2 monitor and loudness switches there are jumpers buried. perhaps something in the switch body is shorting the jumper.
Click to expand...

When I do a unit, I remove the switches and then take the electrical contact board and sliders out and clean them.
First with cleaner, then with deoxit - or in my case because I can access the switch blades, a pencil eraser

Vividly illustrates Deoxit and what it does. Plows a clean streak through the black.
But the slider can be jarred off the clean path and back into the black corrosion.

IF you desolder the switch, don't resolder them and then try to reinstall the board.
You need to reinstall the switch and then the board on top of it, THEN solder the pins.

switch.jpg
 
I have a suggestion:

pull off tape monitor 1 (you already have tape monitor 2 off) and pull off duplicate.

then solder in tape monitor 2

and buzz recheck 21-25, and 1-8 red. 1-4 red should buzz. the "4" red circles are one pad off of position. they should line up with 3 & 6... oops...
 
I've added wire fragments to broken pins. 30 gauge solid (salvaged telco wiring)

switch pin fix.png
 
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installed tape mon 2 switch....tape mon 1 and duplicate are not installed...
21 thru 25 buzz
1 thru 3 buzz
there is no switch installed in mon 1 for pin 4
but, if i touch the common pad of the missing switch then it buzzes...
i think that is what you mean by 4...
all red after that does nothing...
 
markthefixer said:
I've added wire fragments to broken pins. 30 gauge solid (salvaged telco wiring)
Click to expand...
then i will do the same...and pin it out after installation...
should not be that difficult...
i certainly dont see how desoldering the switch can break off a pin...
i will check in the solder sucker...
 
And, a dull set of side cutters will FUC& up a solder joint as they tend to bend and stretch the leads as you cut them. This cracks the joint good
 
gene french said:
installed tape mon 2 switch....tape mon 1 and duplicate are not installed...
21 thru 25 buzz
1 thru 3 buzz
there is no switch installed in mon 1 for pin 4
but, if i touch the common pad of the missing switch then it buzzes...
i think that is what you mean by 4...
all red after that does nothing...
Click to expand...

oops

ok, now tape 2 (threes) does not ground R6. (like it was doing?)
remember that mon 1 has TWO hidden jumpers.
working on this....

procedure: "slowly building it back, looking for faults induced by each action".....
 
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