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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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Uher EG740 tuner from 1979 probably
Used every day,on FM, until one day, switching on and very low level
audio out. Tuning is fine on FM and AM is normal. Phono and Aux inputs to amplifier are normal. Schematic on elektrotanya. Nothing loose found on twizzling. There are some ceramic resonator filters, I'm aware of silver migration over such time spans , resulting in attenuation of throughput, anything else to zero-in on? Lots of Din connectors connecting tuner to preamp and amp, power , signal and control connections. Any advice on improving contacts other than needle insertion to tension up the socket yokes a bit. |
#2
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Uher EG740 tuner from 1979 probably
On Mon, 27 Oct 2014 13:49:18 +0000, N_Cook wrote:
Used every day,on FM, until one day, switching on and very low level audio out. Tuning is fine on FM and AM is normal. Phono and Aux inputs to amplifier are normal. Schematic on elektrotanya. Nothing loose found on twizzling. There are some ceramic resonator filters, I'm aware of silver migration over such time spans , resulting in attenuation of throughput, anything else to zero-in on? Lots of Din connectors connecting tuner to preamp and amp, power , signal and control connections. Any advice on improving contacts other than needle insertion to tension up the socket yokes a bit. Contact spray http://www.youtube.com/watch?v=q1BxYWlT2yc w. |
#3
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Uher EG740 tuner from 1979 probably
On 27/10/2014 21:22, Helmut Wabnig wrote:
On Mon, 27 Oct 2014 13:49:18 +0000, N_Cook wrote: Used every day,on FM, until one day, switching on and very low level audio out. Tuning is fine on FM and AM is normal. Phono and Aux inputs to amplifier are normal. Schematic on elektrotanya. Nothing loose found on twizzling. There are some ceramic resonator filters, I'm aware of silver migration over such time spans , resulting in attenuation of throughput, anything else to zero-in on? Lots of Din connectors connecting tuner to preamp and amp, power , signal and control connections. Any advice on improving contacts other than needle insertion to tension up the socket yokes a bit. Contact spray http://www.youtube.com/watch?v=q1BxYWlT2yc w. At least that is a "do no harm" activity. Uses 4x 10.7M ceramic resonators, the resistance associated with 2 of them , is from the rest of the circuitry Looks like it was a retrofit electrolytic to a 9.4V line, with a large component side solder blob that had corrossion product that touched a bare bridge wire from the mute line of the main control IC. |
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