Channel 2 & 3 Not working on my Audiobahn A4801T

burruel760 · 7th April 2011, 10:45 PM

I have a Audiobahn A4801T 4-channel car amplifier it was bridged pushing 2 "10' Audiobahn 105 T SUBS bridged i had not problems for weeks until it started to go into protection mode.

I went and check all the connections and found that there were 2 resistors were fried on ch's 2 & 3 right next to the transistors located on the heat sink on each side i replaced them but could not find a PO # so i did my best with size matching

I repaired the resistors and put it back together but when i plug a speaker wire in the - side on CH 2 and connect the the other wire to the positive on the the same channel or to any terminal itn acts like it surging on bogging down the jumps into protection mode

On CH 3 the + is doing the same so pretty much i can plug my
ch1 ch2
wires into 3 ports on the top "CH 1 & 2 " Ex ( +- / + ? ) the ? represents the negative that is a problem and CH 3 on the bottom "3 & 4" Ex ( ? - / - +) the ? is the problem

What is the problem please help

Perry Babin · 7th April 2011, 11:23 PM

Photo of the area around the resistors you replaced?

burruel760 · 11:55 PM

This is a picture of the area around please forgive me for the bad quality don't have good camera there picture of the resistors and the back panel to show you my bridge

burruel760 · 7th April 2011, 11:42 PM

This is a picture of the area around please forgive me for the bad quality don't have good camera there picture of the resistors and the back panel to show you my bridge

burruel760 · 7th April 2011, 11:57 PM

MORE PICS

Perry Babin · 8th April 2011, 12:05 AM

Did you replace the large resistors?

What value did you use?

burruel760 · 8th April 2011, 12:19 AM

No just the burnt one could that be the issue ?
Also i know its hard but what size should the resistor be i put a 100 k ohm In
as replacement they looked like the same size

burruel760 · 8th April 2011, 12:20 AM

how do i test the resistors to tell good from bad

Perry Babin · 8th April 2011, 01:16 AM

I can't tell much from the photos. Can you borrow a better camera?

7th April 2011, 10:45 PM	#1
burruel760 diyAudio Member Join Date: Apr 2011	Channel 2 & 3 Not working on my Audiobahn A4801T I have a Audiobahn A4801T 4-channel car amplifier it was bridged pushing 2 "10' Audiobahn 105 T SUBS bridged i had not problems for weeks until it started to go into protection mode. I went and check all the connections and found that there were 2 resistors were fried on ch's 2 & 3 right next to the transistors located on the heat sink on each side i replaced them but could not find a PO # so i did my best with size matching I repaired the resistors and put it back together but when i plug a speaker wire in the - side on CH 2 and connect the the other wire to the positive on the the same channel or to any terminal itn acts like it surging on bogging down the jumps into protection mode On CH 3 the + is doing the same so pretty much i can plug my ch1 ch2 wires into 3 ports on the top "CH 1 & 2 " Ex ( +- / + ? ) the ? represents the negative that is a problem and CH 3 on the bottom "3 & 4" Ex ( ? - / - +) the ? is the problem What is the problem please help

7th April 2011, 11:23 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Photo of the area around the resistors you replaced? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

7th April 2011, 11:42 PM	#4
burruel760 diyAudio Member Join Date: Apr 2011	The surrounding area This is a picture of the area around please forgive me for the bad quality don't have good camera there picture of the resistors and the back panel to show you my bridge

7th April 2011, 11:57 PM	#5
burruel760 diyAudio Member Join Date: Apr 2011	MORE PICTURES MORE PICS

8th April 2011, 12:05 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Did you replace the large resistors? What value did you use? __________________ 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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8th April 2011, 12:19 AM	#7
burruel760 diyAudio Member Join Date: Apr 2011	No just the burnt one could that be the issue ? Also i know its hard but what size should the resistor be i put a 100 k ohm In as replacement they looked like the same size

8th April 2011, 12:20 AM	#8
burruel760 diyAudio Member Join Date: Apr 2011	how do i test the resistors to tell good from bad

8th April 2011, 01:16 AM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I can't tell much from the photos. Can you borrow a better camera? __________________ 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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