|12th December 2015, 07:14 PM||#1|
Join Date: Feb 2009
audiolab 8000p has no output
Hi all , was wondering if you guys could help me out with your expertise ,.
I have an audiolab 8000P for my rear speakers (so never really driven hard) a few weeks ago i noticed the power led was out and found the fuse was blown , i replaced the fuse , power light came back on and i didnt think any more of it until i watched a movie ,,.. !! .. no sound from rear channels .
anyway i have taken the covers off and all looks ok ive taken some pics and some voltage readings from the main output transformers ,, again see photo (sorry about the crudeness of paint , lol ) anyway, not too sure where to go from here ,, ? IMG_6145.jpg
any help appreciated ..
Last edited by moss99; 12th December 2015 at 08:13 PM.
|13th December 2015, 10:46 AM||#6|
Join Date: Apr 2005
Most of the problems with this amp is the fact that the two transistors responsible for the voltage amplification is NOT fittet with a heatsink. As a result they run VERY HOT, and eventually break down. I can`t see the number, but one is a 2SA1209 and the other 2SC2911. Replace with 2SA1358/2SC3421, AND add heatsink.
|13th December 2015, 10:54 AM||#8|
Join Date: Jul 2004
Location: Scottish Borders
I'm fairly sure the 8000p has a DC servo to control the output offset.
That tl071 is probably the servo opamp. check the schematic.
0.112Vdc and 0.351Vdc is far too much from a servo.
How are you measuring the output offset. There should be just one voltage from a mono amplifier.
There must be a fault.
regards Andrew T.
Sent from my desktop computer using a keyboard
Last edited by AndrewT; 13th December 2015 at 10:57 AM.
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