Home |
Search |
Today's Posts |
|
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. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
RCA home theater rt2250 - no audio, 60Hz hum
Anyone else experience this? If the unit is shut off, (cold), When it is
turned on, all you get in all modes is 60 Hz hum. After about 10-15 min, audio cuts in, and is fine until unit is turned off and allowed to cool down again.Any suggestions? TIA |
#2
|
|||
|
|||
RCA home theater rt2250 - no audio, 60Hz hum
Check for thermo sensitive components. You will have to have a way to heat
and cool the suspect parts and test them. One way of doing this is to heat the unit up to make it work. Then cool the individual components one by one to provoke the fault. You can use a product called Freeze-Mist for cooling, and a heat gun for re-heating. This is available from most electronic suppliers. Start in the power supply and output stage areas first. Very basically, the other way is to get the unit in the mode where it does not work, check all the power supply distribution, and follow through the signal path to see where the signal stops. Then it is the task of taking voltage readings, and determining the exact components to test. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "weedmonke" wrote in message 45... Anyone else experience this? If the unit is shut off, (cold), When it is turned on, all you get in all modes is 60 Hz hum. After about 10-15 min, audio cuts in, and is fine until unit is turned off and allowed to cool down again.Any suggestions? TIA |
#3
|
|||
|
|||
RCA home theater rt2250 - no audio, 60Hz hum
Resolder all the voltage regulators.
Mark Z. "weedmonke" wrote in message 45... Anyone else experience this? If the unit is shut off, (cold), When it is turned on, all you get in all modes is 60 Hz hum. After about 10-15 min, audio cuts in, and is fine until unit is turned off and allowed to cool down again.Any suggestions? TIA |
#4
|
|||
|
|||
UPDATE; RCA home theater rt2250 - no audio, 60Hz hum
weedmonke wrote in
45: Anyone else experience this? If the unit is shut off, (cold), When it is turned on, all you get in all modes is 60 Hz hum. After about 10-15 min, audio cuts in, and is fine until unit is turned off and allowed to cool down again.Any suggestions? TIA 2 bad 6800 uF electrolytics next to regulator heat sink. Works great now. Thanks for the advice. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Tape deck has no audio output (Technics RS-TR373) | Electronics Repair | |||
PC audio setup for home office | UK diy | |||
Sound: "fixing"/processing audio channel/s | Electronics Repair | |||
Sony KV27TS29 (Audio) | Electronics Repair | |||
parts source for Mitsubishi DT-40S (home audio) cassette player | Electronics Repair |