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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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Sony VCR SLV-E120
This VCR works fine for about 5-10 minutes, after a while it slows down it's
capstan speed and continues to playback in a jerky mode with distorted sound and picture noisebars. All my supply voltages seems correct and Caps ESR on Powersupply are a OK. Lack of proper documentation prevents me from trouble shooting Capstan servo circuits. Is there anybody out there having experienced similar problem(s) and helping me out ? TYIA |
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#2
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On Sun, 05 Jun 2005 14:11:58 +0200, Bram Stolk wrote:
This VCR works fine for about 5-10 minutes, after a while it slows down it's capstan speed and continues to playback in a jerky mode with distorted sound and picture noisebars. All my supply voltages seems correct and Caps ESR on Powersupply are a OK. Lack of proper documentation prevents me from trouble shooting Capstan servo circuits. Is there anybody out there having experienced similar problem(s) and helping me out ? TYIA I'm not sure how old this unit is, but Sony VCRs used to have problems with the capstan rotor warping and rubbing against copper windings underneath. It produced a condition similar to what you're describing. We would just end up replacing the capstan motor assembly in those cases. Not much else you can do. Randy |
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#3
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TY Randy,
I indeed have seen the warped PCB's holding the capstan motor stator coils causing to interfere with its rotor and being grinded.....but that was on older sony machines... My problem is definitely related to an electronic servo drive rather than mechanical... Thanks for your response anyway "Randy Thompson" schreef in bericht news  On Sun, 05 Jun 2005 14:11:58 +0200, Bram Stolk wrote: This VCR works fine for about 5-10 minutes, after a while it slows down it's capstan speed and continues to playback in a jerky mode with distorted sound and picture noisebars. All my supply voltages seems correct and Caps ESR on Powersupply are a OK. Lack of proper documentation prevents me from trouble shooting Capstan servo circuits. Is there anybody out there having experienced similar problem(s) and helping me out ? TYIA I'm not sure how old this unit is, but Sony VCRs used to have problems with the capstan rotor warping and rubbing against copper windings underneath. It produced a condition similar to what you're describing. We would just end up replacing the capstan motor assembly in those cases. Not much else you can do. Randy |
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