Electronics > Repair
Help repairing a switching power supply out of a Pioneer DJ Disc Player
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jmibk:
Voltage on C11 is around 10V DC, going up and down -> see video.

http://audiowerk.at/PioSupp/3/IMG_1976.MOV

The Diode D7 seems to be ok, diode test is ok (0,565V), resistance 4,5k (+ at A, - at K) and 200k (falling, + at K, - at A)

I also changed back C102 and C103, the voltage is now like on the first pics...

joao2004:
Resistance and voltage from pin 2 to pin 3 (Z2) ??

also check R18 and D4
mij59:
Last thing I can think of is a problem with the feedback, diode test  PC1,  pin 1 and 2 should give a voltage of about 1.1V.
Z101 is probably a TL431, check the data sheet.
jmibk:
Voltage Z2 Pin 2 to 3: 0,4V
R18 = 10kOhm

Diode Test PC1 Pin1 <> Pin 2 = 1,05V

I'll check Z101 and the Diode later...
joao2004:
Remove C7

Diode test PC1 4(+) to 3(-)

Z2 probably is faulty!

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