quad fm3

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27-May-2018 06:26 PM

chris

chris

Posts: 26

My tuner is working and sounding reasonably ok, but over bright in the upper treble, stereo is ok. I have replaced both p.s capacitors 1000uf x 25v also c121 220uf, also adjusted for 19khz at pin 10 is there anything else I can check or is it time for a full re-alignment.

Regards

chris

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28-May-2018 03:10 AM

EJP

EJP

Posts: 1484

If you're in a 75uS area (North America) and you somehow have a 50uS unit, that would explain it. If so, and your serial number is >= 5885, change R112/113 to 6k8, or C108/110/111 to 0.015uF.

EJP

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28-May-2018 12:03 PM

chris

chris

Posts: 26

Many thanks for your reply, first of all I live in the uk (ser no 45,000+ m12327 issue 3 board) I have checked R112/R113 4.7k  C108/110/111 0.010uf  so that's looks ok, checked all resistors seem ok except R108 in situ reads around 8k service manual says should be 18k could this be an issue.

Regards

Chris

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28-May-2018 12:49 PM

EJP

EJP

Posts: 1484

R108 is only for mono. Sounds like you need an alignment. If you're in the UK you should certainly send it to Quad.

EJP

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