Question about Audio Players & Recorders
I have a dead CD73, there is no signs og life when power on. Mains trafo seems ok, and the fuses too.
These are a cool old machine. They use the cdm1 laser mechanism that was revered in its day for high performance. If you have voltage available after the rectifier stages, check the 3 pin voltage regulators. Marked as 78xx for positive regulator, and 79xx for negative. the xx gives you the voltage they are supposed to be putting out. They commonly fail, also check the same for dry solder joint. resolder them anyway if you are unsure. If all the regulators check out, then also check low value flame proof resistors in the power supply rails. Get back to me here again and let me know how you got on. Good Luck
Posted on Aug 09, 2008
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Posted on Jan 02, 2017
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Dead appliance, power on wall outlet.
SAFETY IS PARAMOUNT!
this only if you are competent.
your appliance has absolutely no functions at all, remove it from the
mains supply, remove the case and see where the mains lead goes in to
the appliance and follow the cable until you find the main fuse.
ONLY USE THE SAME TYPE AND RATING OF FUSE TO REPLACE IT.
The usual cause of this fuse failure is the door switches are contaminated or sticking. Check the door switches before putting power back on to the appliance.
Hope this helps.
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