Muting function in Quad FM3 turn on.

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19-May-2019 11:53 AM

Kitte

Kitte

Posts: 2

Hi, Forum!

Problem!

I have a Quad FM3. When turning on I assume a station will be heard immediatly. It does not. If I loosen the casing...only a few millimeter from the front, muting works as expected. If the casing is completely on, I have to turn the tuning knob, to make the muting function work and the tuning and stereo lamps lighten.

I have done modifications as suggested from DaDa. I am going to change the AA119 diode in the muting circuit as it is miscolored. Otherwise I have no more ideas.

Has anyone had this problem?

Regards, Kitte.

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22-May-2019 01:16 PM

EJP

EJP

Posts: 1605

Make sure that the lever holding the lamp in the RF section isn't shorting to the case.
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22-May-2019 05:10 PM

Kitte

Kitte

Posts: 2

Hello again!

I found the fault using a paperclip!!! The tuning condensator is screwed to the radiosection with 3 screws. Loosening those screws and fastening again did the trick. They had corroded a bit. Immediatly on turn on stations are there. Tuning indicators and stereo lamps light up as they should and muting works as expected.

A happy chear to all.

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