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Old 8th August 2008, 09:50 AM   #1
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Default Linn Valhalla - strange fault

I use a stock Linn Valhalla PSU with my custom turntable. It is mounted in a stainless steel case and fitted with a mains switch (to turn it off when not in use).

It has worked great for over 8 months now but lately it has developed a strange fault.

When I turn on the mains power its starts up without me pressing the "operate" button (never done this before!).

The machine runs great but this fault bothers me. Any ideas on how to sort this out?

Thank you

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Old 8th August 2008, 05:28 PM   #2
kevinkr is offline kevinkr  United States
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Schematic to start would help.. Bad switch?
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
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Old 8th August 2008, 06:05 PM   #3
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The power switch controls directly a 4013 D-type flip flop. It seems like the FF gets into the wrong state on power on. One way for this to happen is PS noise (the reset pin is permanently grounded). The obvious suspect is a dry C3.
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Old 9th August 2008, 07:05 AM   #4
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Thank you guys.

I have the schematic and I'll check the C3 cap.

Switch is A-OKAY.

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