Question about Technics SL-PS770A CD Player

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No mains ligh on i thinkits the input transformer but not surehow to check it trevor

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In a lot of Technics CD players there's 1 or 2 little black circuit protectors near or around the power supply, these are usually marked CP or IP, for eg. CP208 / IP208.
These look like little transistors but with 2 terminals and these are basically a fuse.
Test these while desoldered from the circuit.
I wouldn't have thought it was a transformer fault as these are generally
very reliable and i've never known one to fail yet.

Posted on Jul 16, 2012

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Posted on Jan 02, 2017

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depending on your level of electrical knowledge it may be possible to diagnose the problem.

First check the obvious - fuse in plug / distribution board - you would be surprised how many times this is missed.

Beyond this proceed at your own risk as mains voltages will be exposed.

If you open up the keyboard you can check the input voltage with a multimeter is arriving at the power transformer input.

There may be fuses on the transformer board - check these - DON'T FORGET TO UNPLUG FROM THE MAINS FIRST

Check the operation of the mains switch - these do fail over a period of time and your instrument is quite old now. Unplug from the board and test for continuity across the pins.DON'T FORGET TO UNPLUG FROM THE MAINS FIRST


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Doing a resistance test on a transformer will not give the information you require as you will read very little, if any resistance. What you need to do is an impedance check and that gets involved. If it is a normally wound transformer, not an auto transformer, you can isolate which is the primary and the secondary windings. Unless the transformer is a multi voltage input unit, the primary side will have continuity through only two terminals. The secondary could be more than two if it is a multi output voltage one. If the transformer is a step down, the primary windings will be the thinner wired windings and vice-versa. To actually test the transformer, get hold of a transformer with about a 20 vac output and try it across the two terminals you have identified as the primary windings, you should ge a proportional voltage of the actual output. eg. with 20 vac input and a 2 vac reading at the secondary, the actual output would be 11 vac if your mains voltage is 110 volts. Take care that you are using the transformer at the voltage it is designed for, otherwise it will overheat and burn out.

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check the power cable first. also the power at the wall out lets.
if ok the you have to check the input ac fuse of your receiver. your recever has problem with its power supply stage, that's why there is no standby light also. fist of all check the fuse. then check the standby transformer is it faulty or not. the system will power up if the standby transformer is ok. standby transformer is a small transformer near the mains transformer. check these things first, if u need any further assistance feel free to contact me through fixya.
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