Denon Protection Circuit

peter5 · 17th February 2004, 06:22 PM

A couple weeks ago somebody spilled beer into my Denon avr-1400 and blew out several parts. I replaced 5 transistors and a resistor and everything seems to be fine now (all channels work and sound like they should) but after about 5 minutes of playing the protection circuit turns on. If I turn it off and then back on the protection kicks in a lot faster.

Any idea what is going wrong? My only clue is that something is drawing too much current, but does anybody know which parts to look at?

Thanks
Peter

Cybergent · 18th February 2004, 12:25 AM

If it take 5 minutes for the first time, but is much faster on the second time it looks to me like some temperature problem.

Maybe there is some temperature sensor and the idle current is too high after changing transistors. So the amp heats up.

Tony · 18th February 2004, 04:55 AM

hi,
you have to recalibrate the idle current, also the output off-set voltage...after replacing the parts. these things needs to be checked.....

17th February 2004, 06:22 PM	#1
peter5 diyAudio Member Join Date: Jun 2001	Denon Protection Circuit A couple weeks ago somebody spilled beer into my Denon avr-1400 and blew out several parts. I replaced 5 transistors and a resistor and everything seems to be fine now (all channels work and sound like they should) but after about 5 minutes of playing the protection circuit turns on. If I turn it off and then back on the protection kicks in a lot faster. Any idea what is going wrong? My only clue is that something is drawing too much current, but does anybody know which parts to look at? Thanks Peter

18th February 2004, 12:25 AM	#2
Cybergent diyAudio Member Join Date: Jan 2004 Location: Germany / Bavaria / Augsburg	If it take 5 minutes for the first time, but is much faster on the second time it looks to me like some temperature problem. Maybe there is some temperature sensor and the idle current is too high after changing transistors. So the amp heats up. __________________ Best Regards, Cybergent

18th February 2004, 04:55 AM	#3
Tony diyAudio Member Join Date: May 2003 Location: Palatiw, Pasig City	hi, you have to recalibrate the idle current, also the output off-set voltage...after replacing the parts. these things needs to be checked..... __________________ http://www.electronicslab.ph/forum/i...?topic=32688.0

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
Denon PMA480R protection circuit	ashok	Solid State	1	10th February 2007 11:43 PM
Denon AVR2803 goes into protection	Family_Dog	Solid State	14	1st March 2006 09:56 PM
Trouble with speaker protection circuit (Randy Slone's circuit)	whalefat	Solid State	3	13th April 2005 10:13 AM
denon amp protection circuit	ronm	Solid State	2	25th March 2004 04:03 PM


	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

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

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