bxi1205

DREW028 · 28th June 2012, 02:35 AM

Amp power on and seems fine. With no speakers connected, when I turn the gain up on the amp and increase the input it goes into protect. I can hear music playing on the board. It sound like it coming from the relay. Any ideas?

DREW028 · 28th June 2012, 02:38 AM

The ouput is very distorted and squeaky ( testing on a 6x9)

Perry Babin · 28th June 2012, 02:52 AM

If it uses the DWM0608 board, the most likely suspects are Q11 and Q7 on the audio driver board.

There may be other problems also.

Does it draw excessive current as it goes into protect?

DREW028 · 28th June 2012, 03:09 AM

The squeal is there with no input and if move the cone of the speaker it cuts in and out. I have a 7.5 amp fuse installed and it hasn't popped. It does appear to use that board. If I touch the drain tab of the outputs transistors it changes the squeal from the speaker.

timwebb · 28th June 2012, 03:11 AM

i think u might have a bad ground.

DREW028 · 29th June 2012, 12:52 AM

Internally? I'm powering the amp with a power supply.

DREW028 · 29th June 2012, 12:54 AM

Oh man, not one of these again. Amp is working now.

DREW028 · 29th June 2012, 03:31 AM

Back to the same problem. Q7 is 2d and q11 is 1d correct?

Perry Babin · 29th June 2012, 03:43 AM

That's correct.

DREW028 · 30th June 2012, 08:42 PM

Do you know the value of r24 on the driver board? This 1 is broken in half and soldered end facing up. Doesn't appear to burn marks.

28th June 2012, 02:35 AM	#1
DREW028 diyAudio Member Join Date: Jun 2004 Location: chicago	bxi1205 Amp power on and seems fine. With no speakers connected, when I turn the gain up on the amp and increase the input it goes into protect. I can hear music playing on the board. It sound like it coming from the relay. Any ideas?

28th June 2012, 02:52 AM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If it uses the DWM0608 board, the most likely suspects are Q11 and Q7 on the audio driver board. There may be other problems also. Does it draw excessive current as it goes into protect? __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

29th June 2012, 03:43 AM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	That's correct. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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28th June 2012, 02:38 AM	#2
DREW028 diyAudio Member Join Date: Jun 2004 Location: chicago	The ouput is very distorted and squeaky ( testing on a 6x9)

28th June 2012, 03:09 AM	#4
DREW028 diyAudio Member Join Date: Jun 2004 Location: chicago	The squeal is there with no input and if move the cone of the speaker it cuts in and out. I have a 7.5 amp fuse installed and it hasn't popped. It does appear to use that board. If I touch the drain tab of the outputs transistors it changes the squeal from the speaker.

28th June 2012, 03:11 AM	#5
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	i think u might have a bad ground.

29th June 2012, 12:52 AM	#6
DREW028 diyAudio Member Join Date: Jun 2004 Location: chicago	Internally? I'm powering the amp with a power supply.

29th June 2012, 12:54 AM	#7
DREW028 diyAudio Member Join Date: Jun 2004 Location: chicago	Oh man, not one of these again. Amp is working now.

29th June 2012, 03:31 AM	#8
DREW028 diyAudio Member Join Date: Jun 2004 Location: chicago	Back to the same problem. Q7 is 2d and q11 is 1d correct?

30th June 2012, 08:42 PM	#10
DREW028 diyAudio Member Join Date: Jun 2004 Location: chicago	Do you know the value of r24 on the driver board? This 1 is broken in half and soldered end facing up. Doesn't appear to burn marks.