I have used this unit very little and when I turned it on the other day nothing happened. I checked my 120 Volt source and the power cord and I had power to unit. I dismanteled covers to see if there was a fuse but could not find any. The unit had not been used for approx. 4 months prior to turning it on and it had always functioned properly before.
The product is out of warranty and Sony has a program of replacement with a refurbished unit which actually cost more then I can by a new unit for.
I would appreciate any help in troubleshooting the problem.
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Very simple. It is not a defective unit. Simply a matter of volume attenuation, hold the "function" and "grove"keys for aprox 5 seconds until a message saying vac off appears. Problem solved. Resets itself eveytime the unit is turned off .
If you visited Europe and returned to Canada/America and you used a 120 volt appliance on a 230 volt plug using an adapter things can still go wrong. If it no longer works... open it to view where the cord comes in. The first board or section of the board will be a power section. Often there is either 4 diodes or a rectifier with 4 pins these are the likely culprits. If it has a transformer instead then it likely overheated and burned its thermal cutout buried under its layers of tape. I could make it work again if i was there in person.
I would rule out the power supply simply because the batteries won't run it either. The internal plug that takes the cord should be checked for cracked solder joints, because the plug goes to battery mode when cord is removed and AC fuction when cord is plugged in. It is possible it may be an audio output problem given the age of the item.
You will need to check the swith that change from Tape to CD to other functions. If the switch is good. Then the next thing is to check for tape function. Can you try to fast forward, reverse. If these functions are working properly then the pinch roller ( the little wheel that is pulling the tape need to be replaced). If nothing moves then you need to replace the belt and the wheel and possible the motor at the same time
Check your cord first, make sure it's in good shape. Sometimes the main transformer goes out, and you can use a DC adapter to bypass the 120 V source. Could be a fuse, or something else in the power supply inside the unit.
A Lasonic 931 ? It has probably been taken apart by someone before you and may have unplugged the power feed from the battery compartment. Remove the rear panel then check the two wires that come from the battery box are connected to the circuit board.If not, then check to see where they go on the board, it`s not hard to do.Look for the little tabs they slide onto..
probebly the power button is bad
try pushing relly hard or be creative (hammer and such..)
or open the unit( unplug it first!!)
and try connecting manually the power line
if not the processer of the unit is dead and that is the reason way you got the unit in the first place....