Audiofonics ADF-241 output problems - diyAudio
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Old 1st August 2010, 08:28 PM   #1
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Join Date: Jun 2010
Default Audiofonics ADF-241 output problems

hi
i am working on a 2ch Audiofonics ADF-241 amp and two of the outputs on one side gets very hot and the amp draws alot of amps and the power light starts to link .i took them out of the board and tested them they read ok.i try the amp without the two outputs and it seems to be runing fine with no stress.i test the transistors and resistors in that area they tested ok with my mulit meter this amp also has two little boards at the front of the outputs one on each side it has SM parts on it.here are some voltages i took when i remove the two outputs
ALL TEST WAS DONE WITH BLACK LEAD ON GUD TERMINAL


KIA494AP(PWM)
PINS
1=2.5
2=4.9
3=.0
4=.1
5=1.5
6=3.5
7.0
8=12.6 to 12.8 not stable
9=4.7
10=4.7
11=13.2
12=12.5
13=4.9
14=4.9
15=4.9
16=.8



4558d next to the pwm ic
pins
1=1.3
2=10.5
3=5.9
4=.0
5=.7
6=4.9
7=1.2
8=12.3



from gnd to center of fets 12.8 on all four fets
''''''''''''''''''''''''''first legs 4.3 on all four fets
''''''''''''''''''''''''''third legs.0 ''''''''''''''''''''''''''''''

WITH BLACK LEAD ON GUD TERMINAL
30.5 on the center pin
29.7 on the next one

ALL TEST WAS DONE WITH BLACK LEAD ON GUD TERMINAL

and from gud to center of outputs 31v on some and 32v on some

any idea what could be the problem???

thanks
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Old 2nd August 2010, 03:41 AM   #2
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Join Date: Nov 2003
Location: Louisiana
Can you post photos of the inside of the amp?
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Old 2nd August 2010, 10:42 PM   #3
diyAudio Member
 
Join Date: Jun 2010
Default problem found

hi
i found four 16v caps 100uf leaky in power supply area and a broken track to a transistor d6ook in the output section amp work ok now

thx
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