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Sony CD/Radio wont's stay turned on...
Hi - I have an old-but-very-good-condition SOny CFD-44 rado/CD/Casstte player - been reliable for many years... Extremely well made unit - do NOT want to scrap it unless forced :)
Recently, every so often it won't stay turned-on - when it's off, you press the power button and the red power LED comes on for maybe 0.5 seconds - a very small "pop" from the loudspeakers, and it then turns off - normally, a light press on the power button and it stays on fine - the power button is a momentary-press push-button, not a latching switch, so its not that. When its fine (90% of the time) it's an excellend radio cassette... Bit puzzled as to where to go next... Thanks |
Sony CD/Radio wont's stay turned on...
electolytic caps on the B+
Mark |
Sony CD/Radio wont's stay turned on...
On Monday, 12 October 2015 15:12:35 UTC+1, wrote:
electolytic caps on the B+ Mark Checked the main reservoir caps - 6800uF @ 25V - ESR was 0R2 @ 100Hz, seems pretty much ok... Nick |
Sony CD/Radio wont's stay turned on...
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Sony CD/Radio wont's stay turned on...
Nick de Smith wrote:
Checked the main reservoir caps - 6800uF @ 25V - ESR was 0R2 @ 100Hz, seems pretty much ok... ** That figure would be the cap's impedance at 100Hz. The ESR value is much lower, maybe 0.02 ohms. Most ESR testers use a frequency between 20kHz and 100kHz, where the impedance and ESR values are near the same. ..... Phil |
Sony CD/Radio wont's stay turned on...
"M Philbrook" wrote in message
... In article , says... Hi - I have an old-but-very-good-condition SOny CFD-44 rado/CD/Casstte player - been reliable for many years... Extremely well made unit - do NOT want to scrap it unless forced :) Recently, every so often it won't stay turned-on - when it's off, you press the power button and the red power LED comes on for maybe 0.5 seconds - a very small "pop" from the loudspeakers, and it then turns off - normally, a light press on the power button and it stays on fine - the power button is a momentary-press push-button, not a latching switch, so its not that. When its fine (90% of the time) it's an excellend radio cassette... Bit puzzled as to where to go next... Thanks sounds like a cap reforming.. Jamie Nope. Bad connection somewhere. Solder connection, problem with a connector, etc. Mark Z. |
Sony CD/Radio wont's stay turned on...
"M Philbrook" wrote in message
... In article , says... Hi - I have an old-but-very-good-condition SOny CFD-44 rado/CD/Casstte player - been reliable for many years... Extremely well made unit - do NOT want to scrap it unless forced :) Recently, every so often it won't stay turned-on - when it's off, you press the power button and the red power LED comes on for maybe 0.5 seconds - a very small "pop" from the loudspeakers, and it then turns off - normally, a light press on the power button and it stays on fine - the power button is a momentary-press push-button, not a latching switch, so its not that. When its fine (90% of the time) it's an excellend radio cassette... Bit puzzled as to where to go next... Thanks sounds like a cap reforming.. Jamie Nope. Bad connection somewhere. Solder connection, problem with a connector, etc. Mark Z. |
Sony CD/Radio wont's stay turned on...
"M Philbrook" wrote in message
... In article , says... Hi - I have an old-but-very-good-condition SOny CFD-44 rado/CD/Casstte player - been reliable for many years... Extremely well made unit - do NOT want to scrap it unless forced :) Recently, every so often it won't stay turned-on - when it's off, you press the power button and the red power LED comes on for maybe 0.5 seconds - a very small "pop" from the loudspeakers, and it then turns off - normally, a light press on the power button and it stays on fine - the power button is a momentary-press push-button, not a latching switch, so its not that. When its fine (90% of the time) it's an excellend radio cassette... Bit puzzled as to where to go next... Thanks sounds like a cap reforming.. Jamie Nope. Bad connection somewhere. Solder connection, problem with a connector, etc. Mark Z. |
Sony CD/Radio wont's stay turned on...
On Monday, October 12, 2015 at 6:00:31 AM UTC-4, Nick de Smith wrote:
Hi - I have an old-but-very-good-condition SOny CFD-44 rado/CD/Casstte player - been reliable for many years... Extremely well made unit - do NOT want to scrap it unless forced :) Recently, every so often it won't stay turned-on - when it's off, you press the power button and the red power LED comes on for maybe 0.5 seconds - a very small "pop" from the loudspeakers, and it then turns off - normally, a light press on the power button and it stays on fine - the power button is a momentary-press push-button, not a latching switch, so its not that. When its fine (90% of the time) it's an excellend radio cassette... Bit puzzled as to where to go next... Thanks First, the disclaimer: I am not familiar with that unit. Now the two alternate diagnoses: a) If a capacitance-start (solid-state contact-start switch), replace the capacitors as already noted. It might not be a bad idea in any case. And don't stop with the main filters, look to any caps in the starting circuit. Such switches may also operate a small reed relay or solid-state relay. If a reed relay, it may be worn out and not holding. If an SS relay, see caps, above and elsewhere. b) If a mechanical switch, look for dirty contacts, a slipped or worn-through contact or similar. Can you jumper the switch and have it operate normally? As I remember, and, for the record, that little pacific-rim audio equipment that I own is all Sony or Yamaha, Sony does like solid-state switches as they are much easier to manage with remote control, so I expect that this will devolve to a capacitor problem. Best of luck with it. Peter Wieck Melrose Park, PA |
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