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Kevin
 
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Default Pioneer VSX-D503S repaired

A couple of the transistors were questionable and cheap, so it was worth the
few extra dollars to change them. The resistors were all open, some burnt.
The guy that owned it was a "hacker". I thought he outgrown it (he is in his
early
20's), but he probably "opened" it and because of his interest in
electronics, dropped something inside accidently !!. It's just another
"goodie" for one of my family members. Funny how i'll put in the time
fixing an audio / video piece but won't touch a computer.

"Mark D. Zacharias" wrote in message
...
No way it should have had all those parts bad. Somebody must have

tin-foiled
the fuse, or used a 30 amp car fuse or the like.
Good job fixing it, though I have to question if it was worth the effort.


Mark Z.

--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"Kevin" wrote in message
...
This is for Archive purposes. Neighbor gave me this AV Receiver with no
output. I had repaired a VSX-453 for my son 3 years ago and had

purchased
the manual. The manual covers VSX-403, VSX-453 & VSX-463S. The unit

given
to me used the same 5 channel output amplifier as my sons so the repair

was
easier with a good manual. The receiver would power on but no audio,

the
relay wouldn't click coming out of Standby. I found the right front

channel
had bad (shorted output transistors and many other parts. This repair

took
me about 6 hours.

These are the bad parts:

Q4 = 2SA1302
Q3 = 2SC3281
Q512 = 2SC4793
Q514 = 2SA1837
Q508 = 2SC2705
Q506 = 2SA1145
R534 = .33 Ohm 5 Watt Dual Resistor
R575 & R576 = 2.2K 1/8 Watt
R612, R614, R616 & R618 = 4.7 Ohm 1/4 Watt Fusible
R526, R528, R530 & R532 = 100 Ohm 1/4 Watt Fusible
D522, D524 = 1N4752A 33 Volt Zener 1 Watt
D526 = 1SS252 Used a 1N4148
D548 = MTZJ20 Used a 20 Volt Zener