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Old 12th Jun 2021, 6:55 pm   #27
ms660
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Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
Default Re: Sony TC-560 | Slow Fast-Forward & Rewind

To check out the supply voltages first check the voltage between the two points on the power amplifier circuit board on page 26 of the service manual where the Blue and Red wires connect to on the left hand side of the board up near the top, make a note of the voltage (DC) when in Play mode and then when in REW/FF mode.

Next measure the voltage between the two points on the servo amplifier circuit board (page 29 of the manual) that the Yellow and Blue wires are connected to on the top edge of the board at the far right, make a note of the voltage (DC) when in Play mode and then when in REW/FF mode.

Hopefully that should tell us if there's anything significantly wrong with the motor supply voltages to the servo board in both Play and REW/FF.

Lawrence.
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