Linn Valhalla - strange fault

GlidingDutchman · 8th August 2008, 10:50 AM

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

GD

kevinkr · 8th August 2008, 06:28 PM

Schematic to start would help.. Bad switch?

analog_sa · 8th August 2008, 07:05 PM

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.

GlidingDutchman · 9th August 2008, 08:05 AM

Thank you guys.

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

Switch is A-OKAY.

GD

8th August 2008, 10:50 AM	#1
GlidingDutchman diyAudio Member Join Date: Nov 2007	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 GD

8th August 2008, 06:28 PM	#2
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	Schematic to start would help.. Bad switch? __________________ www.kta-hifi.net

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Need help with linn Valhalla repair	ericpeters	Analogue Source	28	4th September 2011 12:08 AM
Very strange fault (CD-player)	jitter	Digital Source	36	23rd November 2010 09:03 PM
Linn Valhalla - Value of R40 and D3	SPWONG	Analogue Source	1	20th January 2008 01:01 AM
Linn Valhalla	6072a	Analogue Source	5	15th October 2005 03:01 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

8th August 2008, 07:05 PM	#3
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	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.

9th August 2008, 08:05 AM	#4
GlidingDutchman diyAudio Member Join Date: Nov 2007	Thank you guys. I have the schematic and I'll check the C3 cap. Switch is A-OKAY. GD

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)