Question about Fisher RS909

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Mystery Voltage Unit trips into protect mode for no aparent reason. Just as msyteriously as it trips in if you shut it off and turn it back on sometime it will work sometimes it will not. Checked for bad solder joints and loose ground, shorted output or output out of range and all seem to checkout just fine. The only real clue I have found is when you meter the voltage at the filter caps and discontinue the voltage one cap will drain completely to zero volts at the proper RC curve. But the other will only drain down to a seven volt load and stay there. But it follows the proper RC curve it just holds the last seven volts. Replaced Both Capacitors, checked the Bridge Rectifier. Seen this in other electronics and could not identify why this is happening. any advice no matter how technical. Will be appreciated

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Well now you did most of what would be recomended. Try this, When the unit trips into protect, check on the output pin on the output IC or if its a transistor output the speaker output BEFORE the protect relay.. If theres any DC voltage on the output pin then you know the problems in that IC or output circuit. If its a transistor type output, I would suspect the differenal circuit. Way up near the input circuit. Its two transistors back to back. They may check good on a regular check so do a high resistive check And see if theres any type of leakage. These I have seen many many times in a Sanyo/Fisher Stereo system to be the problem. If its an IC output, try disconecting that side of the bad output and see if the unit works ok. If theres no DC voltage on the speaker output pins BEFORE the saftey relay then I would suspect the protection circuits bad. Theres op amps in these circuits that are used as comparators and they do go bad. You dont want to dig this deep and get a service diagram, and the units over several years old TOSS it and upgrade!! Good Luck

Posted on Aug 05, 2006

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Posted on Jan 02, 2017

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I have an TX-SR313 for a year now and it was working perfectly until yesterday it just automatically shots off even when I turn it on for several time it just shots off. How can I solve that Problem?


Hello, It seems like the receiver is going into protection mode. A unit will only go into protection mode for two reasons mainly. The first reason is if there is an internal short. The second is if there is an external short which is typically only caused by one or more of the speaker connections. To isolate whether the short is internal or external, you would first need to unplug the receiver and disconnect all of the speakers. At this point you will plug the receiver back in with no speakers connected and turn the unit back on. Also turn the volume up to about 70 (even with no speakers connected). If the unit stays on that means that one or more of the speaker connections was causing the receiver to go into protection mode. If the receiver shuts off again with no speakers connected, then that means the unit would have an internal short and would have to go in for service. Thanks, FJD

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Hi

It could be a problem of cold solder joints, or solder joints on the main board which have cracked over time due to thermal expansion and contraction of the circuit board. Repair is to find and reflow the cracked joints. You may want to consider hiring the services of a reputable repair professional to deal with getting your set back into normal operating condition.

However TV's attempt to protect themselves from damage by shutting down. Your unit has three main ways to protect from damage.

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The TV monitors excessive high voltage and beam current. When the TV detects that one of these is too high the TV shuts off.

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This will activate if excessive current drain on the 130 volt supply line. If the TV detects this supply line is too high the TV shuts off.

Most units made in 1999 have a diagnostic mode to help determine the cause.

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Please do get back to us for further query.


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Hope this helps your inquiry. Have a blessed weekend.

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