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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Pioneer VSX-D503S repaired
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 |
#2
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Pioneer VSX-D503S repaired
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 |
#3
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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 |
#4
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i have my front right channel going bad.....it distorts and barely gets any
signal.....but then last night it worked fine........now today it won't work......i know it is the front right because i hooked my left speaker to it and it isn't the speaker it is the output........is there anyway you could take a picture or something to show me some of the things to look out....i have it here sitting open so knowing the more important things to look at and kind of where they are would help greatly. thanks -Nate |
#5
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The first thing I would look for in this situation is bad solder
connections, at the speaker terminals, and maybe at the output IC and protection relay. Also the relay could be cutting out, though this is less common on receivers of this type. Most Pioneer models of recent (the last 15 years or so) have little to no direct access to the main board - even just to look at it will require a major disassembly. Mark Z. "iamnathanhudson" iamnathanhudson@protected wrote in message lkaboutelectronicequipment.com... i have my front right channel going bad.....it distorts and barely gets any signal.....but then last night it worked fine........now today it won't work......i know it is the front right because i hooked my left speaker to it and it isn't the speaker it is the output........is there anyway you could take a picture or something to show me some of the things to look out....i have it here sitting open so knowing the more important things to look at and kind of where they are would help greatly. thanks -Nate |
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