Crossfire amp help please cfa-602 - Page 11

joesch1999 · 22nd April 2011, 11:03 PM

.4 ohms

Perry Babin · 23rd April 2011, 12:35 PM

If the TLx94 hasn't been replaced, I'd suggest replacing it. Install it in a socket if you have one.

joesch1999 · 23rd April 2011, 05:56 PM

it's a brand new one as of two weeks ago, I have more should I put another one in?

joesch1999 · 23rd April 2011, 06:01 PM

Perry I was messing with the amp last night, was checking over the sockets where the 688's go on the other side of the amp there is negative on collector and base of them, and you already know the sockets where the 718's go on the left side of the amp have positive on both sockets

Perry Babin · 23rd April 2011, 10:08 PM

With the voltage you posted for the IC, I don't see any reason for it to do what you stated that it was doing (essentially shorting pins 9 and 10 together when power is applied). I'd suggest replacing it. It may not solve the problem but it would eliminate it as a possible fault.

joesch1999 · 02:06 PM

ok I have the tl out, there is only a 220 ohm resistor separating the ground pin 7 of the ic from the outputs pins 9 and ten, the tl is o/l out of the board, pin 7 and 16 on the tl give a o/l reading on the IC

joesch1999 · 25th April 2011, 05:17 PM

I am getting negative 12 volts reading on pins 9 and ten with the n channel drivers out

Perry Babin · 25th April 2011, 07:08 PM

Make sure that you didn't have the black probe on the B+ terminal of the amp.

joesch1999 · 07:22 PM

yeah i didn't, is a a1268 npn bipolar? I was noticing I transistor that had been replaced before I got the amp from my friend, the base leg is connected right to the negative terminal of the amp and the collector has twelve volts emitter is putting out 7 volts, I don't think a 1268 is biploar maybe I am wrong hard to find data sheets on those korean parts. I am thinking that maybe whoever worked on this amp before used a 1268 in place of a 3198 i think thats the bipolar one, I put a new tl494 in still same voltages the 1268 is in spot q301

Perry Babin · 25th April 2011, 07:38 PM

Didn't what?

An A1266 is a PNP bipolar transistor. The pin configuration is ECB. The collector is likely connected to ground if this is being used as an FET driver.

The 1268 is also a BJT.

23rd April 2011, 12:35 PM	#102
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If the TLx94 hasn't been replaced, I'd suggest replacing it. Install it in a socket if you have one. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

23rd April 2011, 10:08 PM	#105
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	With the voltage you posted for the IC, I don't see any reason for it to do what you stated that it was doing (essentially shorting pins 9 and 10 together when power is applied). I'd suggest replacing it. It may not solve the problem but it would eliminate it as a possible fault. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

25th April 2011, 02:03 PM	#106
joesch1999 diyAudio Member Join Date: Jan 2011	ok I have the tl out, there is only a 220 ohm resistor separating the ground pin 7 of the ic from the outputs pins 9 and ten, the tl is o/l out of the board, pin 7 and 16 on the tl give a o/l reading on the IC Last edited by joesch1999; 25th April 2011 at 02:06 PM.

25th April 2011, 07:08 PM	#108
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Make sure that you didn't have the black probe on the B+ terminal of the amp. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

25th April 2011, 07:18 PM	#109
joesch1999 diyAudio Member Join Date: Jan 2011	yeah i didn't, is a a1268 npn bipolar? I was noticing I transistor that had been replaced before I got the amp from my friend, the base leg is connected right to the negative terminal of the amp and the collector has twelve volts emitter is putting out 7 volts, I don't think a 1268 is biploar maybe I am wrong hard to find data sheets on those korean parts. I am thinking that maybe whoever worked on this amp before used a 1268 in place of a 3198 i think thats the bipolar one, I put a new tl494 in still same voltages the 1268 is in spot q301 Last edited by joesch1999; 25th April 2011 at 07:22 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

22nd April 2011, 11:03 PM	#101
joesch1999 diyAudio Member Join Date: Jan 2011	.4 ohms

23rd April 2011, 05:56 PM	#103
joesch1999 diyAudio Member Join Date: Jan 2011	it's a brand new one as of two weeks ago, I have more should I put another one in?

23rd April 2011, 06:01 PM	#104
joesch1999 diyAudio Member Join Date: Jan 2011	Perry I was messing with the amp last night, was checking over the sockets where the 688's go on the other side of the amp there is negative on collector and base of them, and you already know the sockets where the 718's go on the left side of the amp have positive on both sockets

25th April 2011, 05:17 PM	#107
joesch1999 diyAudio Member Join Date: Jan 2011	I am getting negative 12 volts reading on pins 9 and ten with the n channel drivers out

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
crossfire cfa-602, car audio amp problem	tuneman	Car Audio	29	23rd September 2010 05:08 AM
crossfire cfa-602, car audio amp problem	tuneman	Solid State	1	11th September 2010 01:51 PM
crossfire amp	mike49504	Car Audio	4	12th January 2010 07:49 AM
Crossfire vr1000D sub amp	no1stunna	Swap Meet	0	21st February 2009 08:59 PM
Mirand A1 CFA-Amp (Pictures) welcome comments !	pixworld	Solid State	23	11th January 2005 11:22 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