pioneer sx1080 help...

[VSAT88]

Damn sure looks better from here. Lol.

 

[markthefixer]

that board looks lots better, but the tone control box on the other side is the one showing the bad solder joints.

 

[gene french]

i will check....

 

[gene french]

better???

 

[markthefixer]

yes better.

what about (in case you missed it)
test2.png back on post 79

test points 21 through 25 ?

 

[gene french]

here it is...

 

[gene french]

it was a low hum....not the loud hum as on the green circles in the previous tests....
hum similar to the red side....

 

[VSAT88]

He he he, it's about to learn a new tune.

 

[markthefixer]

we have a winner....

22 hum, output of R6 a 4.7k resistor
23 quiet, input of R6 a 4.7k resistor

ergo, it's getting lost in R6

 

[gene french]

i can change it....????????

 

[markthefixer]

top view of R6

of course, change it out. Got any or gotta wait for it?

 

[gene french]

its not open....you want i change it anyway??
or do the 21 to 25 test again ??
yes i have resistors

 

[gene french]

this is what keeps me up at night....this is what i just did...
i have hum on 22 and nothing on 23...yet the resistor tests 4.4k ohm
i took one side of a 4.7k ohm resistor in between two fingers tightly and touched pin 22 and got a hum...
i will change the resistor....but dont know what is happening...
its too early to start drinking....i am stone sober...lol

 

[VSAT88]

It's the Ju Ju from the Nigerian thread fucking with you.

 

[VSAT88]

https://forums.phxaudiotape.com/thr...s-who-can-change-into-cats.10266/#post-302549

 

[gene french]

ok...listen to this one....
i changed out the resistor....the old one tested fine out of circuit...
hum on pin 22...but no hum on pin 23 with the new resistor in circuit...
something is holding down pin 23 side....i guess...

 

[gene french]

tape mon 2 switch is bad

 

[markthefixer]

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

 

[gene french]

but, that does not explain why it does not work in the up position????
shoot....

 

[VSAT88]

And now we know the rest of the story, page one. As Paul Harvey used to say. Do you have another switch ? Probably a stupid question to ask as if you have a bunch of old parts sitting around but if you don't I will look through what I have if needed.