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
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.
> No way it should have had all those parts bad. Somebody must have
> 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.
> > 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
> > the manual. The manual covers VSX-403, VSX-453 & VSX-463S. The unit
> > to me used the same 5 channel output amplifier as my sons so the repair
> > easier with a good manual. The receiver would power on but no audio,
> > relay wouldn't click coming out of Standby. I found the right front
> > had bad (shorted output transistors and many other parts. This repair
> > 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