Another 2517 low receive issue

[Hawkeye351]

I marked pin 1 and pin 10 on this pic. This is the direction I've been measuring. Am I confusing the ends?

 

[brandon7861]

That looks like the right order. Are you measuring with the negative on the chassis or the board ground?

 

[brandon7861]

The picure contradicts what was written in post 45 though. In the post you said pin 10 is closest to the 8v regulator and pin 1 closest to the passthrough regulator, in the picture, it looks like you labeled the pin closest to the 8v regulator as pin1 and the pin closest to the passthrough as pin 10. The picture is the correct way.

 

[loosecannon]

yeah your picture is correct but everything you posted sounds like you lifted pin 10 off the board instead of pin 1.


also, the chip should be installed with the label facing the chassis wall.
any chance it got put in backwards?
LC

 

[Hawkeye351]

Yea, I did lift pin 10. Pin 10 according to the schematic goes through C175 before the speaker if I'm reading the schematic correctly.

 

[Hawkeye351]

I got confused on post 45

 

[Hawkeye351]

Yea, I measured using board ground, not chassis ground.

 

[Hawkeye351]

Pin 10 lifted:
Pin 10 pad shows 0v
Pin 10 lead (lifted) shows 10v

All other pins still show the same as with pin 10 lead soldered.

Shouldn't pin 10 lead (when lifted) be slightly less than pin 1? If the lifted pin 10 lead shows 10v, then wouldn't that mean the 7222 isn't amplifying?

 

[loosecannon]

10 volts does seem a bit low.

here are the correct voltages for the audio chip:



LC

 

[brandon7861]

10 volts does seem a bit low.

here are the correct voltages for the audio chip:

View attachment 76151

LC

looks like you got about one diode drop there too. I am convinced that IC is toast.