Question about Audio Players & Recorders
Turning the unit on without any input signal, the speaker did the pop and scratching sound. I found on the limiter board ( small pc board on the main input pc board) that there is a wire jumper on the back side of that had a cold solder joint. You will have to clean up the glue that was used to hold the wire on the back side of the board. I just replaced the wire with new one.
Look at the +15vdc off of Q117, I moved it to the left side of the pc board and added a heat sink to the unit. The 1 watt resistor created some cold solder joints that you will have to check.
hope this helps
Posted on Jul 18, 2009
As Bob has suggested, remove the brown glue on the limiter sub board on the input board, it becomes conductive as it ages. This turns the limiter board into a slow oscillator, causing the loud thumps.
Check for dry joints on transistors Q105 and Q106, on the amplifier board, Also replace the 220 uF 10 Volt capacitor, C130, next to Q106. Q106 gets hot which damages that cap.
(In the sub I was repairing, this cap was only 30uF!!)
Posted on Sep 09, 2010
Sounds like a possible ground loop problem. Are there anyother cables running on top or along side the sub cable? Also, make sure there is no other remotes or electronics on top of the sub itself.
Posted on Mar 04, 2009
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Posted on Jan 02, 2017
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