pioneer sx1080 help...

[gene french]

i saw a wire or something under tape mon2 switch...
dont know what it is...
time to take out the switch???
see underneath??
see why pins aint connecting??in down position???

 

[gene french]

whatever is under there is black...about all i can see...
this is unreal...
you guys have the patience of job...
and i so much appreciate it...

 

[gene french]

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...

 

[gene french]

out of circuit....the tape mon 2 switch....after more spray....
pins out correctly....
the pins 21 thru 25 now all have hums when touched with the switch off of the board....
if this tells anything....

 

[markthefixer]

under the tape 2 monitor and loudness switches there are jumpers buried. perhaps something in the switch body is shorting the jumper.

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.

 

[gene french]

i will give it a go...
now with the switch out of the board....
there is hum on 21, 22, 23, 24, and 25...
the rca cables are still on the back of the unit as a picture i previously sent

 

[markthefixer]

 

[markthefixer]

 

[markthefixer]

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...

 

[gene french]

missing leg on duplicate switch...
it wasnt me...

 

[markthefixer]

I've added wire fragments to broken pins. 30 gauge solid (salvaged telco wiring)

 

[gene french]

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...

 

[gene french]

I've added wire fragments to broken pins. 30 gauge solid (salvaged telco wiring)

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...

 

[WOPL Sniffer]

still some suspect solder joints.

 

[gene french]

still some suspect solder joints.

which ones....????

 

[WOPL Sniffer]

The old Sansui boards were even worse.

 

[WOPL Sniffer]

which ones....????

Take your pick. Magnification is a must. I was looking at a board the other day and it looked ok until I got it under the scope. You can see where the solder connection is pulling and cracking around the leads.

 

[WOPL Sniffer]

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]

i will check...and recheck...got a big magnifying glass...
thanks

 

[markthefixer]

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...

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".....