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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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pioneer vsx-d409
I have this problem with my receiver. pioneer vsx-d409
unit turns on. After a few seconds the unit flashes "poweroff" on the screen and shuts down. switching seems to be fine, volume adjusts on the screen. the speaker output releays do not engage. AC relay is turned on. I can read dc voltage on the two large bridge rectifiers I do not have a service manual so I cannot say if it the correct voltage. There is a fuse near the power amp section that gets no voltage. This is the only thing I notice out of the ordinary. One thing to note though. The fuse holder closest to the AC input was bent, so that the fuse was very loose. The fuse was ok but maybe it causes spikes???? Any ideas? |
#2
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pioneer vsx-d409
The most common thing is a blown amp channel. Don't remember if yours uses
discrete transistors or output IC's. Pioneers for the most part have no direct access to the bottom of the main board. This would make a do-it-yourself repair rather difficult for most people. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... I have this problem with my receiver. pioneer vsx-d409 unit turns on. After a few seconds the unit flashes "poweroff" on the screen and shuts down. switching seems to be fine, volume adjusts on the screen. the speaker output releays do not engage. AC relay is turned on. I can read dc voltage on the two large bridge rectifiers I do not have a service manual so I cannot say if it the correct voltage. There is a fuse near the power amp section that gets no voltage. This is the only thing I notice out of the ordinary. One thing to note though. The fuse holder closest to the AC input was bent, so that the fuse was very loose. The fuse was ok but maybe it causes spikes???? Any ideas? |
#3
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pioneer vsx-d409
this has two power modules.
is there a way to detemine if one or both is defective? i can get into it. don't be shy on technical gotta do's thanks for your help. "Mark D. Zacharias" wrote in message ... The most common thing is a blown amp channel. Don't remember if yours uses discrete transistors or output IC's. Pioneers for the most part have no direct access to the bottom of the main board. This would make a do-it-yourself repair rather difficult for most people. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... I have this problem with my receiver. pioneer vsx-d409 unit turns on. After a few seconds the unit flashes "poweroff" on the screen and shuts down. switching seems to be fine, volume adjusts on the screen. the speaker output releays do not engage. AC relay is turned on. I can read dc voltage on the two large bridge rectifiers I do not have a service manual so I cannot say if it the correct voltage. There is a fuse near the power amp section that gets no voltage. This is the only thing I notice out of the ordinary. One thing to note though. The fuse holder closest to the AC input was bent, so that the fuse was very loose. The fuse was ok but maybe it causes spikes???? Any ideas? |
#4
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pioneer vsx-d409
OK, I'm going to try to look up the stuff. I'll get back to you.
mz -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... this has two power modules. is there a way to detemine if one or both is defective? i can get into it. don't be shy on technical gotta do's thanks for your help. "Mark D. Zacharias" wrote in message ... The most common thing is a blown amp channel. Don't remember if yours uses discrete transistors or output IC's. Pioneers for the most part have no direct access to the bottom of the main board. This would make a do-it-yourself repair rather difficult for most people. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... I have this problem with my receiver. pioneer vsx-d409 unit turns on. After a few seconds the unit flashes "poweroff" on the screen and shuts down. switching seems to be fine, volume adjusts on the screen. the speaker output releays do not engage. AC relay is turned on. I can read dc voltage on the two large bridge rectifiers I do not have a service manual so I cannot say if it the correct voltage. There is a fuse near the power amp section that gets no voltage. This is the only thing I notice out of the ordinary. One thing to note though. The fuse holder closest to the AC input was bent, so that the fuse was very loose. The fuse was ok but maybe it causes spikes???? Any ideas? |
#5
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pioneer vsx-d409
There should be a .22 ohm resistor in front of each output IC corresponding
to each amp channel. Probably 5 watt, white emitter resistors. You can measure the DC at these resistors. Whichever one has the big DC voltage is your bad IC. Be aware Pioneer also uses special little pico-fuses on many of these models - you might have one or more bad. I believe they're rated at 10 amps on your model. I only see one in the schematic, but I could have missed something. It could be a regular fuse - the schem doesn't say. The part number given here is REK1087. The output IC's are pretty much only available from Pioneer. There is a STK lot number on the back but generic suppliers wouldn't be any cheaper on these - I've tried. Pioneer's parts dept. number in the U.S. is: 800-457-2881. Try telling them you're with a servicer, you might get it cheaper. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Mark D. Zacharias" wrote in message ... OK, I'm going to try to look up the stuff. I'll get back to you. mz -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... this has two power modules. is there a way to detemine if one or both is defective? i can get into it. don't be shy on technical gotta do's thanks for your help. "Mark D. Zacharias" wrote in message ... The most common thing is a blown amp channel. Don't remember if yours uses discrete transistors or output IC's. Pioneers for the most part have no direct access to the bottom of the main board. This would make a do-it-yourself repair rather difficult for most people. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... I have this problem with my receiver. pioneer vsx-d409 unit turns on. After a few seconds the unit flashes "poweroff" on the screen and shuts down. switching seems to be fine, volume adjusts on the screen. the speaker output releays do not engage. AC relay is turned on. I can read dc voltage on the two large bridge rectifiers I do not have a service manual so I cannot say if it the correct voltage. There is a fuse near the power amp section that gets no voltage. This is the only thing I notice out of the ordinary. One thing to note though. The fuse holder closest to the AC input was bent, so that the fuse was very loose. The fuse was ok but maybe it causes spikes???? Any ideas? |
#6
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pioneer vsx-d409
very cool stuff.
Thanks a million. you wouldn't have a scan of that schematic would you? anyway here are my findings... i found 5 pico fuses near power modules. all are good. i found 5 0.22 ohm resistors near power modules. one near the large power module PAC011A reads 65v on it. By this i assume that the output transistor on that channel is shorted thus applying the full rail voltage to the power resistor. i think you found my problem. Pioneer charges $90 Canadian for this guy. not a problem. i don't mind paying for good parts. Thanks again. B "Mark D. Zacharias" wrote in message ... There should be a .22 ohm resistor in front of each output IC corresponding to each amp channel. Probably 5 watt, white emitter resistors. You can measure the DC at these resistors. Whichever one has the big DC voltage is your bad IC. Be aware Pioneer also uses special little pico-fuses on many of these models - you might have one or more bad. I believe they're rated at 10 amps on your model. I only see one in the schematic, but I could have missed something. It could be a regular fuse - the schem doesn't say. The part number given here is REK1087. The output IC's are pretty much only available from Pioneer. There is a STK lot number on the back but generic suppliers wouldn't be any cheaper on these - I've tried. Pioneer's parts dept. number in the U.S. is: 800-457-2881. Try telling them you're with a servicer, you might get it cheaper. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Mark D. Zacharias" wrote in message ... OK, I'm going to try to look up the stuff. I'll get back to you. mz -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... this has two power modules. is there a way to detemine if one or both is defective? i can get into it. don't be shy on technical gotta do's thanks for your help. "Mark D. Zacharias" wrote in message ... The most common thing is a blown amp channel. Don't remember if yours uses discrete transistors or output IC's. Pioneers for the most part have no direct access to the bottom of the main board. This would make a do-it-yourself repair rather difficult for most people. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... I have this problem with my receiver. pioneer vsx-d409 unit turns on. After a few seconds the unit flashes "poweroff" on the screen and shuts down. switching seems to be fine, volume adjusts on the screen. the speaker output releays do not engage. AC relay is turned on. I can read dc voltage on the two large bridge rectifiers I do not have a service manual so I cannot say if it the correct voltage. There is a fuse near the power amp section that gets no voltage. This is the only thing I notice out of the ordinary. One thing to note though. The fuse holder closest to the AC input was bent, so that the fuse was very loose. The fuse was ok but maybe it causes spikes???? Any ideas? |
#7
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pioneer vsx-d409
Glad that seems to have worked out for you.
mz -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... very cool stuff. Thanks a million. you wouldn't have a scan of that schematic would you? anyway here are my findings... i found 5 pico fuses near power modules. all are good. i found 5 0.22 ohm resistors near power modules. one near the large power module PAC011A reads 65v on it. By this i assume that the output transistor on that channel is shorted thus applying the full rail voltage to the power resistor. i think you found my problem. Pioneer charges $90 Canadian for this guy. not a problem. i don't mind paying for good parts. Thanks again. B "Mark D. Zacharias" wrote in message ... There should be a .22 ohm resistor in front of each output IC corresponding to each amp channel. Probably 5 watt, white emitter resistors. You can measure the DC at these resistors. Whichever one has the big DC voltage is your bad IC. Be aware Pioneer also uses special little pico-fuses on many of these models - you might have one or more bad. I believe they're rated at 10 amps on your model. I only see one in the schematic, but I could have missed something. It could be a regular fuse - the schem doesn't say. The part number given here is REK1087. The output IC's are pretty much only available from Pioneer. There is a STK lot number on the back but generic suppliers wouldn't be any cheaper on these - I've tried. Pioneer's parts dept. number in the U.S. is: 800-457-2881. Try telling them you're with a servicer, you might get it cheaper. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Mark D. Zacharias" wrote in message ... OK, I'm going to try to look up the stuff. I'll get back to you. mz -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... this has two power modules. is there a way to detemine if one or both is defective? i can get into it. don't be shy on technical gotta do's thanks for your help. "Mark D. Zacharias" wrote in message ... The most common thing is a blown amp channel. Don't remember if yours uses discrete transistors or output IC's. Pioneers for the most part have no direct access to the bottom of the main board. This would make a do-it-yourself repair rather difficult for most people. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... I have this problem with my receiver. pioneer vsx-d409 unit turns on. After a few seconds the unit flashes "poweroff" on the screen and shuts down. switching seems to be fine, volume adjusts on the screen. the speaker output releays do not engage. AC relay is turned on. I can read dc voltage on the two large bridge rectifiers I do not have a service manual so I cannot say if it the correct voltage. There is a fuse near the power amp section that gets no voltage. This is the only thing I notice out of the ordinary. One thing to note though. The fuse holder closest to the AC input was bent, so that the fuse was very loose. The fuse was ok but maybe it causes spikes???? Any ideas? |
#8
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pioneer vsx-d409
On Sat, 22 Nov 2003 12:18:36 -0500, "Joust"
wrote/replied to: i think you found my problem. Pioneer charges $90 Canadian for this guy. not a problem. i don't mind paying for good parts. I just bought a perfectly good, used Pioneer VSX700 Amp, with learning remote on auction, for about 10 bucks. You might wanna check around. Jim Davis - checkout the Motorcycle Headlight Relay Kit at: http://jimdavis.oberro.com/html/bike_acc_.html |
#9
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pioneer vsx-d409
On Sat, 22 Nov 2003 12:18:36 -0500, "Joust"
wrote/replied to: i think you found my problem. Pioneer charges $90 Canadian for this guy. not a problem. i don't mind paying for good parts. I just bought a perfectly good, used Pioneer VSX700 Amp, with learning remote on auction, for about 10 bucks. You might wanna check around. Jim Davis - checkout the Motorcycle Headlight Relay Kit at: http://jimdavis.oberro.com/html/bike_acc_.html |
#10
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pioneer vsx-d409
Hi Mark,
You didn't mention if you had a copy of those schematics available. I am going to try to repair the same model of receiver, and those schematics would be extremely useful. Thanks a bunch, Andrew "Mark D. Zacharias" wrote in message ... There should be a .22 ohm resistor in front of each output IC corresponding to each amp channel. Probably 5 watt, white emitter resistors. You can measure the DC at these resistors. Whichever one has the big DC voltage is your bad IC. Be aware Pioneer also uses special little pico-fuses on many of these models - you might have one or more bad. I believe they're rated at 10 amps on your model. I only see one in the schematic, but I could have missed something. It could be a regular fuse - the schem doesn't say. The part number given here is REK1087. The output IC's are pretty much only available from Pioneer. There is a STK lot number on the back but generic suppliers wouldn't be any cheaper on these - I've tried. Pioneer's parts dept. number in the U.S. is: 800-457-2881. Try telling them you're with a servicer, you might get it cheaper. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Mark D. Zacharias" wrote in message ... OK, I'm going to try to look up the stuff. I'll get back to you. mz -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... this has two power modules. is there a way to detemine if one or both is defective? i can get into it. don't be shy on technical gotta do's thanks for your help. "Mark D. Zacharias" wrote in message ... The most common thing is a blown amp channel. Don't remember if yours uses discrete transistors or output IC's. Pioneers for the most part have no direct access to the bottom of the main board. This would make a do-it-yourself repair rather difficult for most people. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... I have this problem with my receiver. pioneer vsx-d409 unit turns on. After a few seconds the unit flashes "poweroff" on the screen and shuts down. switching seems to be fine, volume adjusts on the screen. the speaker output releays do not engage. AC relay is turned on. I can read dc voltage on the two large bridge rectifiers I do not have a service manual so I cannot say if it the correct voltage. There is a fuse near the power amp section that gets no voltage. This is the only thing I notice out of the ordinary. One thing to note though. The fuse holder closest to the AC input was bent, so that the fuse was very loose. The fuse was ok but maybe it causes spikes???? Any ideas? |
#11
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pioneer vsx-d409
Actually, I do have the PDF available, and as luck would have it, I'm back
to a higher-speed connection. Post back if you want it and I'll reply direct with the attachment. It's about 4 meg. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Andrew Hebert" wrote in message om... Hi Mark, You didn't mention if you had a copy of those schematics available. I am going to try to repair the same model of receiver, and those schematics would be extremely useful. Thanks a bunch, Andrew "Mark D. Zacharias" wrote in message ... There should be a .22 ohm resistor in front of each output IC corresponding to each amp channel. Probably 5 watt, white emitter resistors. You can measure the DC at these resistors. Whichever one has the big DC voltage is your bad IC. Be aware Pioneer also uses special little pico-fuses on many of these models - you might have one or more bad. I believe they're rated at 10 amps on your model. I only see one in the schematic, but I could have missed something. It could be a regular fuse - the schem doesn't say. The part number given here is REK1087. The output IC's are pretty much only available from Pioneer. There is a STK lot number on the back but generic suppliers wouldn't be any cheaper on these - I've tried. Pioneer's parts dept. number in the U.S. is: 800-457-2881. Try telling them you're with a servicer, you might get it cheaper. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Mark D. Zacharias" wrote in message ... OK, I'm going to try to look up the stuff. I'll get back to you. mz -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... this has two power modules. is there a way to detemine if one or both is defective? i can get into it. don't be shy on technical gotta do's thanks for your help. "Mark D. Zacharias" wrote in message ... The most common thing is a blown amp channel. Don't remember if yours uses discrete transistors or output IC's. Pioneers for the most part have no direct access to the bottom of the main board. This would make a do-it-yourself repair rather difficult for most people. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Joust" wrote in message ... I have this problem with my receiver. pioneer vsx-d409 unit turns on. After a few seconds the unit flashes "poweroff" on the screen and shuts down. switching seems to be fine, volume adjusts on the screen. the speaker output releays do not engage. AC relay is turned on. I can read dc voltage on the two large bridge rectifiers I do not have a service manual so I cannot say if it the correct voltage. There is a fuse near the power amp section that gets no voltage. This is the only thing I notice out of the ordinary. One thing to note though. The fuse holder closest to the AC input was bent, so that the fuse was very loose. The fuse was ok but maybe it causes spikes???? Any ideas? |
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