audiobahn a2201t

ben04srt · 7th August 2008, 07:55 PM

I have 20v on the right channel , this is after replaceing the output and driver transistors. I checked all resistors on this side also.
Am I missing something?

jol50 · 7th August 2008, 08:40 PM

What kind of signal is the driver giving the outputs?

ben04srt · 7th August 2008, 08:41 PM

do you mean the voltage going from the drivers to the output?

all three legs of the drivers have between 17 to 20 volts

Perry Babin · 7th August 2008, 09:07 PM

Is the amp in the photo the same as yours?

ben04srt · 7th August 2008, 09:32 PM

similar not exact
the output is arranged alittle different

heres a pic
its not the best pic ,

ben04srt · 7th August 2008, 10:21 PM

The driver (2sd600) and a pre-driver (2sa1023) were also defective. There was also an open 47 ohm resistor (next to R63E in the photos)

that was from repair notes from a 6601t on the dvd
I am beginning to think that is my problem

jol50 · 8th August 2008, 01:16 AM

Perry knows much more than I, but if I had that kind of power on the bases I would find where it is coming from to start with. It should be the same layout as the other side.

Perry Babin · 8th August 2008, 06:19 AM

If you have +20v on the speaker terminal (black meter probe on the secondary center tap of the power transformer and red probe on the 3rd leg of the output transistors of the defective channel), either the NPN transistor is leaking (electrically - not likely since it's new) or it's being driven on by another component. Measure the DC voltage from leg 1 to leg 3 of the NPN output transistor. What is the voltage from 1-3 (black probe on 3)?

What is the voltage from 1-3 on the PNP output (red probe on leg 3)?

ben04srt · 9th August 2008, 04:08 PM

npn
1. - .508
2.- 1.845

pnp
1- .236
2- 039.6

Perry Babin · 9th August 2008, 04:49 PM

I don't understand the numbers . #1 would appear to be the voltage from 1-3. What is #2?

8th August 2008, 06:19 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If you have +20v on the speaker terminal (black meter probe on the secondary center tap of the power transformer and red probe on the 3rd leg of the output transistors of the defective channel), either the NPN transistor is leaking (electrically - not likely since it's new) or it's being driven on by another component. Measure the DC voltage from leg 1 to leg 3 of the NPN output transistor. What is the voltage from 1-3 (black probe on 3)? What is the voltage from 1-3 on the PNP output (red probe on leg 3)? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

9th August 2008, 04:49 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I don't understand the numbers . #1 would appear to be the voltage from 1-3. What is #2? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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7th August 2008, 07:55 PM	#1
ben04srt diyAudio Member Join Date: Jul 2006 Location: Dover,ohio	audiobahn a2201t I have 20v on the right channel , this is after replaceing the output and driver transistors. I checked all resistors on this side also. Am I missing something?

7th August 2008, 08:40 PM	#2
jol50 diyAudio Member Join Date: Nov 2007	What kind of signal is the driver giving the outputs?

7th August 2008, 08:41 PM	#3
ben04srt diyAudio Member Join Date: Jul 2006 Location: Dover,ohio	do you mean the voltage going from the drivers to the output? all three legs of the drivers have between 17 to 20 volts

7th August 2008, 10:21 PM	#6
ben04srt diyAudio Member Join Date: Jul 2006 Location: Dover,ohio	The driver (2sd600) and a pre-driver (2sa1023) were also defective. There was also an open 47 ohm resistor (next to R63E in the photos) that was from repair notes from a 6601t on the dvd I am beginning to think that is my problem

8th August 2008, 01:16 AM	#7
jol50 diyAudio Member Join Date: Nov 2007	Perry knows much more than I, but if I had that kind of power on the bases I would find where it is coming from to start with. It should be the same layout as the other side.

9th August 2008, 04:08 PM	#9
ben04srt diyAudio Member Join Date: Jul 2006 Location: Dover,ohio	npn 1. - .508 2.- 1.845 pnp 1- .236 2- 039.6

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