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#1
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Pioneer QX-949 Quad amp....
This monster was recently given to me by a woman getting rid of her late
husbands "junk". It hasn't been used for years, but it fires up, all the lights work, and the quad display works. All the controls are dirty, but they work. Problem is, the right front channel is weak until its been on about 5 minutes, then it pops on and off. I suspect bad solder joints, a gentle tap on the top will bring the right channel back up for a bit. Rear channels are functional also. Before I put it on the bench and get started on the basics, anyone have any experience with these units? The last one I saw (while drooling heavily), was in the Navy exchange on Guam back in 72 or 73. Want to get it fully functional, and replace a Proton 930 in the computer room with the Pioneer. Any info on known faults or weaknesses would be appreciated. TIA Deke -- "Any sufficiently advanced technology is indistinguishable from magic." Arthur C. Clarke (1917 - ), "Technology and the Future" |
#2
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Ahhh, finally something from my time and days. I will say at first, that I
have not worked on this model, but am extremely experienced with this era of electronics. It seems you have a simple problem, since you can tap it and it will work. I would say, also, it is a bad solder joint. Most of the time on the older units, the ones with all the wires, they eventually work them self's free from the years of being run. Meaning that the heat from them running, and then cooling off, will eventually break them free from the PC board. But first thing I would do is clean all the pots and switches. Get yourself some tuner cleaner (preferably one with a lubrication agent in it, you can usually find this at your local Radio Shack, or part store.) It will clean them out, and if this isn't the problem, then at least you know that they are clean when you do solve the problem. Sorry I can't be more help, but with out it sitting in front of me, I can't see the actual unit. Maybe someone else can look at the same pix I looked at and give a more to the point answer http://www.classic-audio.com/pioneer/pics/i_qx949.jpg What I would do personally, and remember, I am experienced at working on the older units. But I would take the top off, and turn it on. Take a Dowel rod, or something similar, that is non conductive, and LIGHTLY touch the wires, and the individual PC boards, till you find the one giving you the problem (Reason I say lightly is because if you tap too hard, it could vibrate to the board or wire that is in fault). Then inspect them for lose or broken connections. Now, like I said, it is hard to say exactly what it could be, with out actually having the unit in front of me, but this is the way I would go to trouble shoot the problem. HOWEVER, being that I don't know your experience in electronics, I do urge you to use caution. And if your experience in electronics is little to none, I urge you to take this unit to a qualified tech, dispose of it in the proper manner, or just put up with the problem till the unit expires. That's my story, and I'm sticking to it, hope that's helps. Rick "Deke" wrote in message ... This monster was recently given to me by a woman getting rid of her late husbands "junk". It hasn't been used for years, but it fires up, all the lights work, and the quad display works. All the controls are dirty, but they work. Problem is, the right front channel is weak until its been on about 5 minutes, then it pops on and off. I suspect bad solder joints, a gentle tap on the top will bring the right channel back up for a bit. Rear channels are functional also. Before I put it on the bench and get started on the basics, anyone have any experience with these units? The last one I saw (while drooling heavily), was in the Navy exchange on Guam back in 72 or 73. Want to get it fully functional, and replace a Proton 930 in the computer room with the Pioneer. Any info on known faults or weaknesses would be appreciated. TIA Deke -- "Any sufficiently advanced technology is indistinguishable from magic." Arthur C. Clarke (1917 - ), "Technology and the Future" |
#3
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That's a nice solidly built machine.
Good shielding on the tuner, transformer and amplifier. Solid looking counterwieght for smooth tuning on the radio dial. |
#4
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Thanks for the input Rick, I've been working in the electronics field, both
private and military, since the late 60's. I'm really anxious to get into this amp, partially out of curiosity, and because I want to revive the old beast. And I have several cans of Channel Master "Shield" left (now illegal, but the ultimate cleaner/lubricant), so the controls wont be a problem. I've ordered the service manual. Just wanted any input from anyone else that may have worked on one of these. Thanks again. Deke "Ricky Eck" wrote in message ... Ahhh, finally something from my time and days. I will say at first, that I have not worked on this model, but am extremely experienced with this era of electronics. It seems you have a simple problem, since you can tap it and it will work. I would say, also, it is a bad solder joint. Most of the time on the older units, the ones with all the wires, they eventually work them self's free from the years of being run. Meaning that the heat from them running, and then cooling off, will eventually break them free from the PC board. But first thing I would do is clean all the pots and switches. Get yourself some tuner cleaner (preferably one with a lubrication agent in it, you can usually find this at your local Radio Shack, or part store.) It will clean them out, and if this isn't the problem, then at least you know that they are clean when you do solve the problem. Sorry I can't be more help, but with out it sitting in front of me, I can't see the actual unit. Maybe someone else can look at the same pix I looked at and give a more to the point answer http://www.classic-audio.com/pioneer/pics/i_qx949.jpg What I would do personally, and remember, I am experienced at working on the older units. But I would take the top off, and turn it on. Take a Dowel rod, or something similar, that is non conductive, and LIGHTLY touch the wires, and the individual PC boards, till you find the one giving you the problem (Reason I say lightly is because if you tap too hard, it could vibrate to the board or wire that is in fault). Then inspect them for lose or broken connections. Now, like I said, it is hard to say exactly what it could be, with out actually having the unit in front of me, but this is the way I would go to trouble shoot the problem. HOWEVER, being that I don't know your experience in electronics, I do urge you to use caution. And if your experience in electronics is little to none, I urge you to take this unit to a qualified tech, dispose of it in the proper manner, or just put up with the problem till the unit expires. That's my story, and I'm sticking to it, hope that's helps. Rick "Deke" wrote in message ... This monster was recently given to me by a woman getting rid of her late husbands "junk". It hasn't been used for years, but it fires up, all the lights work, and the quad display works. All the controls are dirty, but they work. Problem is, the right front channel is weak until its been on about 5 minutes, then it pops on and off. I suspect bad solder joints, a gentle tap on the top will bring the right channel back up for a bit. Rear channels are functional also. Before I put it on the bench and get started on the basics, anyone have any experience with these units? The last one I saw (while drooling heavily), was in the Navy exchange on Guam back in 72 or 73. Want to get it fully functional, and replace a Proton 930 in the computer room with the Pioneer. Any info on known faults or weaknesses would be appreciated. TIA Deke -- "Any sufficiently advanced technology is indistinguishable from magic." Arthur C. Clarke (1917 - ), "Technology and the Future" |
#5
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I'd be willing to bet even odds the problem is either dirty switches (probably
the tape monitor) or else the speaker protection relay contacts. Very common on these units. |
#6
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The speaker relay contacts may need cleaning. This model uses those little
blue Sanyo coupling caps in the tone/pre and main amp input areas; they had lots of problems with those. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Deke" wrote in message ... This monster was recently given to me by a woman getting rid of her late husbands "junk". It hasn't been used for years, but it fires up, all the lights work, and the quad display works. All the controls are dirty, but they work. Problem is, the right front channel is weak until its been on about 5 minutes, then it pops on and off. I suspect bad solder joints, a gentle tap on the top will bring the right channel back up for a bit. Rear channels are functional also. Before I put it on the bench and get started on the basics, anyone have any experience with these units? The last one I saw (while drooling heavily), was in the Navy exchange on Guam back in 72 or 73. Want to get it fully functional, and replace a Proton 930 in the computer room with the Pioneer. Any info on known faults or weaknesses would be appreciated. TIA Deke -- "Any sufficiently advanced technology is indistinguishable from magic." Arthur C. Clarke (1917 - ), "Technology and the Future" |
#7
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Alan and Mark Z.....Thanks for the input. I'm forcing myself not to even
crack the case until I get the service manual, plus there's a reel to reel spread out on the bench right now, and its a small bench. Judging by its weight, 52 pounds, I think my first project will be to a make a wooden jig to hold it at a good angle to get to the bottom of the main circuit board. I noticed the right channel sound cuts off using headphones, so its probably in the pre-out section. Have to wait to get the schematics to see what the commonalties are. Thanks again! Now to get the Sansui SD-7000 out of test mode, put back together, and off the bench. Deke "Mark D. Zacharias" wrote in message ... The speaker relay contacts may need cleaning. This model uses those little blue Sanyo coupling caps in the tone/pre and main amp input areas; they had lots of problems with those. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Deke" wrote in message ... This monster was recently given to me by a woman getting rid of her late husbands "junk". It hasn't been used for years, but it fires up, all the lights work, and the quad display works. All the controls are dirty, but they work. Problem is, the right front channel is weak until its been on about 5 minutes, then it pops on and off. I suspect bad solder joints, a gentle tap on the top will bring the right channel back up for a bit. Rear channels are functional also. Before I put it on the bench and get started on the basics, anyone have any experience with these units? The last one I saw (while drooling heavily), was in the Navy exchange on Guam back in 72 or 73. Want to get it fully functional, and replace a Proton 930 in the computer room with the Pioneer. Any info on known faults or weaknesses would be appreciated. TIA Deke -- "Any sufficiently advanced technology is indistinguishable from magic." Arthur C. Clarke (1917 - ), "Technology and the Future" |
#8
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The headphones are run off of the main amp - as they are in most amps. Just
limiting resistors added. Doesn't eleiminate main amp or relay problems. Try tapping on the relay, when you get the chance, and see if that affects your problem. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Deke" wrote in message ... Alan and Mark Z.....Thanks for the input. I'm forcing myself not to even crack the case until I get the service manual, plus there's a reel to reel spread out on the bench right now, and its a small bench. Judging by its weight, 52 pounds, I think my first project will be to a make a wooden jig to hold it at a good angle to get to the bottom of the main circuit board. I noticed the right channel sound cuts off using headphones, so its probably in the pre-out section. Have to wait to get the schematics to see what the commonalties are. Thanks again! Now to get the Sansui SD-7000 out of test mode, put back together, and off the bench. Deke "Mark D. Zacharias" wrote in message ... The speaker relay contacts may need cleaning. This model uses those little blue Sanyo coupling caps in the tone/pre and main amp input areas; they had lots of problems with those. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "Deke" wrote in message ... This monster was recently given to me by a woman getting rid of her late husbands "junk". It hasn't been used for years, but it fires up, all the lights work, and the quad display works. All the controls are dirty, but they work. Problem is, the right front channel is weak until its been on about 5 minutes, then it pops on and off. I suspect bad solder joints, a gentle tap on the top will bring the right channel back up for a bit. Rear channels are functional also. Before I put it on the bench and get started on the basics, anyone have any experience with these units? The last one I saw (while drooling heavily), was in the Navy exchange on Guam back in 72 or 73. Want to get it fully functional, and replace a Proton 930 in the computer room with the Pioneer. Any info on known faults or weaknesses would be appreciated. TIA Deke -- "Any sufficiently advanced technology is indistinguishable from magic." Arthur C. Clarke (1917 - ), "Technology and the Future" |
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