Question about Audio & Video Receivers
There should be an 8 pin IC close to the input jack that will be marked 4558 or 4560. This is an Op-amp Ic that is the most likely cause of the problem. Replace that IC and report the results here.
Posted on May 28, 2008
SOURCE: Older Peavey PA Head XR600C.
If you need a circuit for the PA board... get it from here
I would start by checking with a multimeter for shorts in driver transistors Q2 and 12
The output stage may be suspect for a driver to have failed. I would disconnect(emmitter and collector) of each output transistor for leakage and shorts in all directions (swap meter leads +ve and -ve). You can often tell at a glance that there IS a short in the output stage, by checking collector emitter with everything still connected. You cannot, however tell if there is leakage that may kill any repair work that you are doing.
Good work on the lamp. I use one in line with the mains socket on my test bench. I use a 40 watt build though.Have seen some smoke with higher wattages. I also use a variac to soft start the unit and do some DC checks mostly for symmetry in output stages with about 40-70 v into the 240 volt mains socket.
Let me know if you find any shorted transpistanators :)
Posted on Jun 13, 2008
SOURCE: amp. doesn't turn on
22nf 630dc/300ac capacitor inside back left board, i found mine on top of this board, a magnifine glass will help to check the writing on capacitor, replaced mine, works as new, g.knight. uk. ( rs components.)
Posted on Oct 04, 2009
This problem is very common in this model the solution is to replace the fuse with improved one 10A 125V of type CES710A having part No.1-576-695-11. Remember that this fuse would be larger in size of earlier one so that you have to drill it first in the holder and adjust the fuse to a proper space of 1.4 drill bit.
Do the changes and your product work fine.
Posted on Nov 24, 2009
Go to the shop.
Posted on May 28, 2010
Testimonial: "Thanks - I came to the same conclusion myself - hopefully something simple and not too expensive."
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