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#1
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Philips 977 turntable
Can any diehard Philips turntable fan out there supply a
schematic/repair manual for this table. I have a major speed control problem with the default (and only) speed available being approximately 90 rpm. All the ICs appearently are not marked, or have had their identification painted over. As appears typical of Philips, customer service is non-existent. I am the original purchaser of this piece, which got very light usage from about 1980 till 1987 or so when it went into storage. Took it out last year to dub some older records to CD, and make back up copies to MP3's on my hard drive, and was disappointed to find it had died in storage. Any help is appreciated. |
#2
Posted to rec.audio.tech
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Philips 977 turntable
dancing_bear wrote:
Can any diehard Philips turntable fan out there supply a schematic/repair manual for this table. I have a major speed control problem with the default (and only) speed available being approximately 90 rpm. All the ICs appearently are not marked, or have had their identification painted over. As appears typical of Philips, customer service is non-existent. I am the original purchaser of this piece, which got very light usage from about 1980 till 1987 or so when it went into storage. Took it out last year to dub some older records to CD, and make back up copies to MP3's on my hard drive, and was disappointed to find it had died in storage. Any help is appreciated. Generically speaking - check any larger power supply capacitors; ripple from a bad one could swamp out the motor speed control reference. Clean any mechanical switches or potentiometers. Mark Z. |
#3
Posted to rec.audio.tech
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Philips 977 turntable
Mark D. Zacharias wrote: dancing_bear wrote: Can any diehard Philips turntable fan out there supply a schematic/repair manual for this table. I have a major speed control problem with the default (and only) speed available being approximately 90 rpm. All the ICs appearently are not marked, or have had their identification painted over. As appears typical of Philips, customer service is non-existent. I am the original purchaser of this piece, which got very light usage from about 1980 till 1987 or so when it went into storage. Took it out last year to dub some older records to CD, and make back up copies to MP3's on my hard drive, and was disappointed to find it had died in storage. Any help is appreciated. Generically speaking - check any larger power supply capacitors; ripple from a bad one could swamp out the motor speed control reference. Clean any mechanical switches or potentiometers. Mark Z. Thanks! You've given me more help in 3 lines then 2 years of dredging through old Philips sales and service info that I could find on the web. It would be nice if there was a law that all companies had to post in a public repository all documentation on a product, be it hardware or software when they stopped supporting it. Blueprints, schematics, manuals, PCB artwork....everything. It's amazing what a creative machinist and a good electronics technician can accomplish with just a little insight...I had already checked the speed control pots and shot them with some contact cleaner just as PM, but thanks for the heads up on the failing supply caps. I'll try to have at again later this week. |
#4
Posted to rec.audio.tech
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Philips 977 turntable
Mark D. Zacharias wrote: dancing_bear wrote: Can any diehard Philips turntable fan out there supply a schematic/repair manual for this table. I have a major speed control problem with the default (and only) speed available being approximately 90 rpm. All the ICs appearently are not marked, or have had their identification painted over. As appears typical of Philips, customer service is non-existent. I am the original purchaser of this piece, which got very light usage from about 1980 till 1987 or so when it went into storage. Took it out last year to dub some older records to CD, and make back up copies to MP3's on my hard drive, and was disappointed to find it had died in storage. Any help is appreciated. Generically speaking - check any larger power supply capacitors; ripple from a bad one could swamp out the motor speed control reference. Clean any mechanical switches or potentiometers. Mark Z. Thanks! You've given me more help in 3 lines then 2 years of dredging through old Philips sales and service info that I could find on the web. It would be nice if there was a law that all companies had to post in a public repository all documentation on a product, be it hardware or software when they stopped supporting it. Blueprints, schematics, manuals, PCB artwork....everything. It's amazing what a creative machinist and a good electronics technician can accomplish with just a little insight...I had already checked the speed control pots and shot them with some contact cleaner just as PM, but thanks for the heads up on the failing supply caps. I'll try to have at again later this week. |
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