taramps ta2700

[megael9]

I`m working with a taramps 2700. This unit has
the prot and the clip ligts sequencing on and off,
with a laps of about 1 sec in between. I checked
for shorts, and found nothing short.
Any idea?

 

[Perry Babin]

If no one else can help, post a photo of the inside of the amp and I'll try to help.

 

[megael9]

Here are some pictures

 

[megael9]

Here are the pictures

 

[Perry Babin]

PM fcruz (if he doesn't reply) to see if he has a schematic diagram or other information on it. This seems to be similar to the Stetsom amps which he seems to know fairly well.

 

[fcruz]

not understand the defect or it turns on and off the LED lights and the protection of the clip

 

[fcruz]

this amp from a defect in long line of the factory has a pre bulletin to replace all the TL072 a look at the transistors q1 and q2

 

[fcruz]

a look at the image you scored some points to check

 

[megael9]

I know I have to replace all the 072, But not sure if
I have to replace Q1, Q2, Q5, R125, R126 and the two
TL712 ic`s please let me know.
By the way, thanks fcruz for sharing your knowledge.

 

[fcruz]

the q1, q2, q5, R125, r126 and tl712 check you are not to replace

 

[megael9]

After replacing all the tl072,tl712,Q1,Q2,Q5,R125,and R126.
know there is audio at the output transistors gate, but no audio output.
using the negative terminal as groung, the voltages at the output
transitors pins are as fallow, starting from the transistor closer to the
speaker terminal as transistor number 1, pin1 12v, pin2 156v, pin3 12v.
number 2 transistor is the same voltage as number1. transistors number 3 and 4
pin1 6v, pin2 12v, pin3 .0v. Am I using the right ground?

 

[megael9]

Don`t know why, but there is
audio at the output gates, but no
audio out. my oscilloscope shows
a square wave of about 5volts at
the irs2010 driver ic inputs and
outpus. any idea?

 

[fcruz]

it will have a square wave on pin 10 and 12 ir2010

 

[fcruz]

I'm sorry pin 12 and 14 of 2010 is going square wave

 

[fcruz]

has the irs vcc pin 3

 

[fcruz]

square wave is coming out of the irs pins 1 and 8

 

[fcruz]

shutdown pin 13 of the irs

 

[fcruz]

a look at the output coils L1 and L2 can be broken with the terminals

 

[fcruz]

see if it comes out on pin 3 of the 50kHz square wave pic

 

[fcruz]

she and 2 ohms or 1 ohms