crown com tech 210 problem help

strat1953 · 11th March 2010, 01:45 AM

i have a problem.one channel is fine ,one is half volume.it sounds fine ,just lower.the output section seems to be fine.there are 2 ic chips in the preamp section (r and l).one has lower output than the other.i just got a new one and replaced it.still low volume. voltages are the same on both.the chip is a mc 30079n i believe. Help??

llwhtt · 11th March 2010, 03:09 AM

Couldn't find the 210 schematic so I'm looking at the 810 schematic off of the Crown site. Which MC33079 IC did you replace? U100? If there is a feedback network around the IC check those components, especially the 47pf cap if it is U100 or it's mate.

Craig

strat1953 · 13th March 2010, 02:30 AM

you got a paypal address.your idea on the cap was a success.ill send you some $ for the help. send it to strat1953@aol.com thanks so much. Guy

llwhtt · 13th March 2010, 03:02 PM

No need for payment, that's why we're all here. The 47pf capacitor was not a wild guess by the way. I had a Macro 5000 in for repair years ago and that's what the problem was, a 47pf capacitor. I'm thinking Crown got a bad batch of these suckers because there is very little voltage across them and no reason to go short. Anyway glad you found the problem, hope it was easier to work on than the 5000 beast.

Craig

11th March 2010, 01:45 AM	#1
strat1953 diyAudio Member Join Date: Jan 2010	crown com tech 210 problem help i have a problem.one channel is fine ,one is half volume.it sounds fine ,just lower.the output section seems to be fine.there are 2 ic chips in the preamp section (r and l).one has lower output than the other.i just got a new one and replaced it.still low volume. voltages are the same on both.the chip is a mc 30079n i believe. Help??

13th March 2010, 02:30 AM	#3
strat1953 diyAudio Member Join Date: Jan 2010	thanks Craig you got a paypal address.your idea on the cap was a success.ill send you some $ for the help. send it to strat1953@aol.com thanks so much. Guy

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
Crown Power-Tech 2 repair	AW-tech	Solid State	0	17th November 2009 03:40 AM
Crown Com-Tech 210 Power Amplifier Crown Com-Tech 210	tyler477	Solid State	1	31st October 2008 04:24 AM
Crown Macro-Tech 600 problem	pharaohamps	Solid State	7	15th May 2008 01:02 PM
Crown Micro-Tech 600	dirtyk777	Solid State	100	24th October 2006 05:19 PM
Crown i-Tech pictures	Evan Shultz	Class D	5	7th November 2004 02:54 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

11th March 2010, 03:09 AM	#2
llwhtt diyAudio Member Join Date: Jun 2008	Couldn't find the 210 schematic so I'm looking at the 810 schematic off of the Crown site. Which MC33079 IC did you replace? U100? If there is a feedback network around the IC check those components, especially the 47pf cap if it is U100 or it's mate. Craig

13th March 2010, 03:02 PM	#4
llwhtt diyAudio Member Join Date: Jun 2008	No need for payment, that's why we're all here. The 47pf capacitor was not a wild guess by the way. I had a Macro 5000 in for repair years ago and that's what the problem was, a 47pf capacitor. I'm thinking Crown got a bad batch of these suckers because there is very little voltage across them and no reason to go short. Anyway glad you found the problem, hope it was easier to work on than the 5000 beast. Craig

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