Re: MY SONY LBT-LX90AV CASSETT PLAYS DISCORD AND BELT...
Hi. Make sure the flywheel turns freely and that the capstan pin and pressure roller are clean. If this is OK then it is more than likely that the belt is stretched, dried out or generally worn. These parts only have a certain usable life and are quite cheap to replace.
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From the description this indicates the microprocessor control ic is failing, unplug power from wall receptical, now press and hold power for 2 minutes in an attempt to reset the ic, if no change! cheaper to replace the book shelf system.
Most likely cause are bad belts, when you have the play button only partly pushed in the pinch roller is not fully engaged. When you push it in all the way the drag is too much for the worn belts and they are slipping causing the cassette to drag.
Make a note of how the belt fits, then remove it and measure the diameter. Then buy a replacement, belts do go bad from time to time, so a new one might cure the problem. Put the diameter size (to the nearest mm result, IE: 50 or 55mm, not 52mm! Into google and "cassette belt" and you should find one for the job.
Stereo sytems have a protection circuit that alerts you by displaying "protect" when there is a electrical short circuit detected in the system, the most common short happens in a speaker, try disconnectig the speaker wires of both speakers(all speakers) at the back of the system, then play the CD or cassette player(although you will not hear anything with the speakers disconnected) and see if the unit goes into "protect" mode if the problem is still present then you have an internal short circuit and the system will need to be sent in for service or replaced(depending on age,repair costs). I would not recommend investing more than $80 into repairs. Now, if the unit does not go into "protect mode" then one of the speakers or speaker wires is shorted,be sure you check the conndition of the speaker wires before you replace the speakers, then you can replace the speakers(in a pair) and you should be back up and listening! Good luck and Merry Christmas !
To isolate the source of the problem disconnect all speakers and turn on the unit, if it works that means that you have to check cables and speakers. If the problem remains that means the problem is with the unit.
Professional technician is required:
The problem is at the power output section (Defective out put IC or Voltage error?)
Yeppers very common problem .. If the noise dosent come from the speakers then the problem is in the motor in the cassette deck. if the problem comes from the speakers when the deck is playing a tape, then the problem is in the record/playback switch. you may beable to fix it by spraying just a lttle bit of tuner cleaner inside the switch. It shouldnt cost much to have a repair shop do this as if you spray too much your going to ruin the belts and the mechanism. Good Luck