Crest CPX 2600 blowned

hiko121 · 5th May 2010, 05:46 PM

HAllo,
I have problem with my CXP-2600. There was blowned 4 output transistors. After replacement the amp blowned again after 2 days other transistors in the same output. It was without signal, just the fan goes in high speed and main fuse switched off the amp. I replaced blown transistors again, but the amp works as before. After 10 min, fan in high speed and the Q115 is hot (all transistors were replaced). I turn it quickly off, becose i mean, the transitors will blown again. Output, supply is OK, i checked it with osciloskop. Has somebody schematics diagram, or can you help me with this problem? Thanks!

sumaudioguy · 5th May 2010, 07:05 PM

Seems like the bias is set to high or there is oscillation. There may be an adjustment for bias as a small potentiometer. Saw no handy schematic on the web. Good luck.

nigelwright7557 · 6th May 2010, 12:16 AM

I would check the bias and output DC offset.

If you have fitted new transistors the bias will need setting up again.

audiomachines · 6th May 2010, 05:14 AM

Haven't seen a cpx schemes but crest is very fond of using a crowbar protection on the output, maybe you should check if this pro amp has one, The triac could false trigger sometimes or intermittently. Hope this helps. Good luck.

djk · 6th May 2010, 10:08 AM

Send me your e-mail address and I will send the schematics for the CPX2600.

powerflux · 6th May 2010, 10:48 AM

hi,

i've already sent you the schematics

HighTec · 6th May 2010, 02:25 PM

Hi,

guys, would you be so kind and send me also those schematics. I would like to see some solutions in that amp.

sumaudioguy · 6th May 2010, 09:20 PM

Yes would like that schematic also... Thanks -SUM

audiomachines · 6th May 2010, 10:09 PM

...me too I would like to have a copy, thanks in advance

djk · 7th May 2010, 12:09 PM

Hey guys, you have to use the forum mail to send me your e-mail address if you expect the schematics. Three large attachments.

Alternately, you can call Crest.

5th May 2010, 05:46 PM	#1
hiko121 diyAudio Member Join Date: Mar 2010	Crest CPX 2600 blowned HAllo, I have problem with my CXP-2600. There was blowned 4 output transistors. After replacement the amp blowned again after 2 days other transistors in the same output. It was without signal, just the fan goes in high speed and main fuse switched off the amp. I replaced blown transistors again, but the amp works as before. After 10 min, fan in high speed and the Q115 is hot (all transistors were replaced). I turn it quickly off, becose i mean, the transitors will blown again. Output, supply is OK, i checked it with osciloskop. Has somebody schematics diagram, or can you help me with this problem? Thanks!

5th May 2010, 07:05 PM	#2
sumaudioguy diyAudio Member Join Date: Jan 2010 Location: Midwest U.S.A.	Seems like the bias is set to high or there is oscillation. There may be an adjustment for bias as a small potentiometer. Saw no handy schematic on the web. Good luck. __________________ What the other guy said----Standing on the shoulders of giants. New avatar- no more little array

6th May 2010, 12:16 AM	#3
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	I would check the bias and output DC offset. If you have fitted new transistors the bias will need setting up again. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

6th May 2010, 10:08 AM	#5
djk diyAudio Member Join Date: Feb 2001 Location: USA	Send me your e-mail address and I will send the schematics for the CPX2600. __________________ Candidates for the Darwin Award should not read this author.

6th May 2010, 09:20 PM	#8
sumaudioguy diyAudio Member Join Date: Jan 2010 Location: Midwest U.S.A.	Yes would like that schematic also... Thanks -SUM __________________ What the other guy said----Standing on the shoulders of giants. New avatar- no more little array


	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

6th May 2010, 05:14 AM	#4
audiomachines diyAudio Member Join Date: Dec 2005 Location: silang, cavite	Haven't seen a cpx schemes but crest is very fond of using a crowbar protection on the output, maybe you should check if this pro amp has one, The triac could false trigger sometimes or intermittently. Hope this helps. Good luck.

6th May 2010, 10:48 AM	#6
powerflux diyAudio Member Join Date: Apr 2008	hi, i've already sent you the schematics

6th May 2010, 02:25 PM	#7
HighTec diyAudio Member Join Date: Mar 2003 Location: Sibenik, Croatia	Hi, guys, would you be so kind and send me also those schematics. I would like to see some solutions in that amp.

6th May 2010, 10:09 PM	#9
audiomachines diyAudio Member Join Date: Dec 2005 Location: silang, cavite	...me too I would like to have a copy, thanks in advance

7th May 2010, 12:09 PM	#10
djk diyAudio Member Join Date: Feb 2001 Location: USA	Hey guys, you have to use the forum mail to send me your e-mail address if you expect the schematics. Three large attachments. Alternately, you can call Crest. __________________ Candidates for the Darwin Award should not read this author.

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

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
[REQ] crest CPX 2600 schematic	powerflux	Solid State	11	21st September 2011 10:28 AM
Crest CPX-1500	Audio Tech	Solid State	4	4th January 2011 10:05 PM
crest cpx 2600	jonz	Solid State	5	1st September 2006 11:20 AM
Crest CPX-2600/1500 or QSC 2450/1450 or Crown CE1000?	Feandil	Solid State	13	13th April 2005 06:10 PM
noisy fan on Crest 2600	jonz	Solid State	2	6th October 2004 12:00 AM

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