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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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Tuner broken in Denon DRA-335R Stereo Receiver
Hi,
Everythings works except the tuner - it suddenly broke a few days ago. When I set the receiver to search for radio stations in its "automatic tuning mode", its frequency counter just counts continuously through all FM (and AM) stations and doesn't seem to find any RF signals at all. An external FM antennae is attached, and has been working in those location for a year. A walkman in the same room picks up all these stations now. So it looks like the digital computer portion of the receiver is working fine, but the RF Front End seems to be broken. I've got the service manual, but didn't see anything obviously wrong when I poked around with a voltmeter. The interior was very much dust-covered - I cleaned off much of the dust with some q-tips. A few days later, i.e., right now, the tuner started working again. But now I know it's flaky - it didn't work for almost a week. Any ideas? thanks, js. |
#2
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Tuner broken in Denon DRA-335R Stereo Receiver
In article ,
"JS" wrote: Hi, Everythings works except the tuner - it suddenly broke a few days ago. When I set the receiver to search for radio stations in its "automatic tuning mode", its frequency counter just counts continuously through all FM (and AM) stations and doesn't seem to find any RF signals at all. An external FM antennae is attached, and has been working in those location for a year. A walkman in the same room picks up all these stations now. So it looks like the digital computer portion of the receiver is working fine, but the RF Front End seems to be broken. I've got the service manual, but didn't see anything obviously wrong when I poked around with a voltmeter. The interior was very much dust-covered - I cleaned off much of the dust with some q-tips. A few days later, i.e., right now, the tuner started working again. But now I know it's flaky - it didn't work for almost a week. Any ideas? thanks, js. bad contact on some switch (like the power switch... ) it was that on my proton tuner, the power switch has multiple pole, and one pole was not making a good contact. check also all the connectors inside. good luck. -- Jean-Yves. |
#3
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Tuner broken in Denon DRA-335R Stereo Receiver
Probably bad solder connections, either at the antenna inputs at the main
board, or in the front-end pack itself. It happens. Mark Z. -- Please reply only to Group. I regret this is necessary. Viruses and spam have rendered my regular e-mail address useless. "JS" wrote in message ... Hi, Everythings works except the tuner - it suddenly broke a few days ago. When I set the receiver to search for radio stations in its "automatic tuning mode", its frequency counter just counts continuously through all FM (and AM) stations and doesn't seem to find any RF signals at all. An external FM antennae is attached, and has been working in those location for a year. A walkman in the same room picks up all these stations now. So it looks like the digital computer portion of the receiver is working fine, but the RF Front End seems to be broken. I've got the service manual, but didn't see anything obviously wrong when I poked around with a voltmeter. The interior was very much dust-covered - I cleaned off much of the dust with some q-tips. A few days later, i.e., right now, the tuner started working again. But now I know it's flaky - it didn't work for almost a week. Any ideas? thanks, js. |
#4
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Tuner broken in Denon DRA-335R Stereo Receiver
The first things to look for are loose or broken connections, cold solder
connections, bad switches, and anything else obvious. The next step is to verify in the tuner section if the front end RF stage is functioning, if the local oscillator in the tuner section is working, if the mixer stage is working, and then on to the IF amplifiers, detector, and then the audio buffer stages. Some techs like to do the reverse and start at the output end and work forward. To check the front end you will need a scope, and preferably an RF test generator set to a reference frequency and level. If you are not experienced and equipped for this type of service, you would be best off to send the unit out for service. -- Jerry G. ========================== "JS" wrote in message ... Hi, Everythings works except the tuner - it suddenly broke a few days ago. When I set the receiver to search for radio stations in its "automatic tuning mode", its frequency counter just counts continuously through all FM (and AM) stations and doesn't seem to find any RF signals at all. An external FM antennae is attached, and has been working in those location for a year. A walkman in the same room picks up all these stations now. So it looks like the digital computer portion of the receiver is working fine, but the RF Front End seems to be broken. I've got the service manual, but didn't see anything obviously wrong when I poked around with a voltmeter. The interior was very much dust-covered - I cleaned off much of the dust with some q-tips. A few days later, i.e., right now, the tuner started working again. But now I know it's flaky - it didn't work for almost a week. Any ideas? thanks, js. |
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