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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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DCC capstan howl?
Hi All,
I'm attempting to repair a high end DCC recorder (Philips DCC900), the fault only seems to affect DCC tapes not normal cassettes... On playback there is a high pitched howl, suprisingly load from the transport mechanism, loading the capstan flywheel (with my finger, to slow it down) didn't make much difference, pulling the rubber pich roller away also made no difference. When the transport is howling the audio level goes to zero. For a while, the sequence of rewind, stop, play - howl, if followed by a stop and play then the howl went away. This doesn't happen when the cassete is removed or using a regular cassette, different DCC tapes also howl. If I press the tape lightly while playing in one corner the howling stops. All help welcome, I'm trying to sort this out for an elderly neighbour who has a large collection of DCC tapes. TIA! Paul |
#2
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DCC capstan howl?
"dotter" wrote in message ... On playback there is a high pitched howl, suprisingly load from the transport mechanism, loading the capstan flywheel (with my finger, to slow it down) didn't make much difference, pulling the rubber pich roller away also made no difference. First I would look for a mechanical slippage. |
#3
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DCC capstan howl?
On 6 May, 13:10, dotter wrote:
Hi All, I'm attempting to repair a high end DCC recorder (Philips DCC900), the fault only seems to affect DCC tapes not normal cassettes... On playback there is a high pitched howl, suprisingly load from the transport mechanism, loading the capstan flywheel (with my finger, to slow it down) didn't make much difference, pulling the rubber pich roller away also made no difference. When the transport is howling the audio level goes to zero. For a while, the sequence of rewind, stop, play - howl, if followed by a stop and play then the howl went away. This doesn't happen when the cassete is removed or using a regular cassette, different DCC tapes also howl. If I press the tape lightly while playing in one corner the howling stops. All help welcome, I'm trying to sort this out for an elderly neighbour who has a large collection of DCC tapes. TIA! Paul Sounds like bad bearnings. NT |
#4
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DCC capstan howl?
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#5
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DCC capstan howl?
I'm attempting to repair a high end DCC recorder (Philips DCC900), the
fault only seems to affect DCC tapes not normal cassettes... On playback there is a high pitched howl, suprisingly load from the transport mechanism, loading the capstan flywheel (with my finger, to slow it down) didn't make much difference, pulling the rubber pich roller away also made no difference. When the transport is howling the audio level goes to zero. For a while, the sequence of rewind, stop, play - howl, if followed by a stop and play then the howl went away. This doesn't happen when the cassete is removed or using a regular cassette, different DCC tapes also howl. If I press the tape lightly while playing in one corner the howling stops. All help welcome, I'm trying to sort this out for an elderly neighbour who has a large collection of DCC tapes. Sounds like bad bearnings. NT I had a similar howling problem. Certain tapes were worse than others, and it depended how far through the tape you were playing. It was caused by the slipping clutch on the take-up capstan. Instead of slipping, it's actually oscillating between stop and go, hence the howling sound (a bit like producing a note with a wine glass). Many clutches have a simple torque adjustment. Changing the torque MAY stop the howling. There are three spring fingers pressing onto a 'stepped' part of the underside of the take-up wheel. You adjust the torque by rotating the spring fingers onto the next step. Ian. Thanks to all who replied - much appreciated. I've given the captan bearings a good lube but unfortunately there doesn't seem to be any way to adjust the torque on the take-up clutch. The clutch seems to consist of a disk of felt between two plastic disks, I tried wetting the felt if only to change the characteristics of the system but with no improvement, possibly worse - but very variable The number of moving parts is limited so resigned myself to "toucing" all of them in some way but the deck ony seems to dismantle "easily" to a certain level, I can't get the take-up sprockets apart - very disappointing ---Paul |
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