Hi all
I have a CD-73 with several issues; first was the +12V regulator defective.
Now the player starts, track playing is good but after 10-15 minutes it stops playing.
Acting on play button again a strange noise like an Hiss comes from the motor area (like zzzzzzzzwwwiiinngggg
); the turntable try to start but moves only half a millimiter.
The laser power is the same value as working state (tested with a laser meter) and all the voltages from PSU are ok.
Used the refrigerating spray to find the issue but nothing happens; if I leave the unit unpowered for a day it restarts and play CD so the problem appears again.
All the voltage on Mab8840 are ok as on the schematic.
What could be the issue?
I have a CD-73 with several issues; first was the +12V regulator defective.
Now the player starts, track playing is good but after 10-15 minutes it stops playing.
Acting on play button again a strange noise like an Hiss comes from the motor area (like zzzzzzzzwwwiiinngggg
); the turntable try to start but moves only half a millimiter.The laser power is the same value as working state (tested with a laser meter) and all the voltages from PSU are ok.
Used the refrigerating spray to find the issue but nothing happens; if I leave the unit unpowered for a day it restarts and play CD so the problem appears again.
All the voltage on Mab8840 are ok as on the schematic.
What could be the issue?
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Looks like a thermal solder crack (provided that supply voiltages are ok)...
Take the cover off and check if the time before stop gets longer or not.
The noise you describe will be present as the turntable motor slows down when it is not supposed to do so. Could be defective motor driver, monitor the voltage across the motor to determine which is at fault, motor or driver then follow the schematic until the fault is found.
Don't forget, the biggest chip rarely fails.
Don't forget, the biggest chip rarely fails.