Peavey XR 684f 'no power to mixer'

[MARSHALL BUSTER]

Hi again guy's

Xr684f has no power to the front board, the rear power board is working ok so far with ipod pluged into L+R amp inputs sound is good!!

I checked the ribon conector at the mixer board end and its showing +0.68v at pin 8

Should pin 8 be +15v??

I followed it back to the power board and transistor Q215 is showing 0v at pin 1 and 0.68 at pin 3

I need to test further but i have no schmatics for the power board! if there is one about could someone point me in that direction as i only seem to find front board schems.

Thankyou hope your all well

[soundguruman]

I think you might have a dead regulator?
Looks like unregulated 10 volts on pin 8, on what I have, but it may not be the same. Check on both sides of R267...

[MARSHALL BUSTER]

Thankyou Soundguruman

Ok just a recap on Q215!!... There is +29.9v at pin 1 'not 0v like i said before', i missread what i had checked

So there is only .7v at pin 3 on Q215 and iv checked R267 and it also showing .7v on both sides.

I'm going to change Q215 first and take it from there, i need to order them in as nobody local seems to have them on the shelf

[soundguruman]

Thankyou Soundguruman

Ok just a recap on Q215!!... There is +29.9v at pin 1 'not 0v like i said before', i missread what i had checked

So there is only .7v at pin 3 on Q215 and iv checked R267 and it also showing .7v on both sides.

I'm going to change Q215 first and take it from there, i need to order them in as nobody local seems to have them on the shelf

Well actually, thank PV service department. They have always supported us with parts and schematics.
Q 215 is a 7815 voltage regulator, easily available at almost at any electronics store, in stock almost everywhere,
7815T: MAJOR BRANDS: ICs & Semiconductors
they do blow now and then.
But why did it blow? Is there something drawing too much current on the +15 rail?
try LM7815 or NTE968