Soundstream TX2.1500

[Albis2985]

Goodnight,

Someone will have the soundstream tarantula tx2.1500 diagram because the entire source is burned and I cannot recognize the drive transistors

 

[Albis2985]

Good afternoon,

I managed to solve the drive transistors now I have the amplifier in protection since the tl494 is not oscillating these are the voltages in the tl494 what I do not know is that it may be causing the protection since the pin16 reaches an npn transistor which I pick it up and the protection goes away.

Pin1 0v
Pin2 4.94V
Pin3 4.54V
Pin4 0 V
Pin5 1.45V
Pin6 3.56V
Pin7 0V
Pin8 12V
Pin9 0V
Pin10 0V
Pin11 12V
Pin12 12V
Pin13 4.94V
Pin14 4.94V
Pin15 2.02V
Pin16 4.04V

 

[Perry Babin]

Are the FETs in the amp?

 

[Albis2985]

if you mean the source fet are all out

 

[Perry Babin]

If you have the tutorial, PS troubleshooting page, item 44. If not, find and lift Q87 or install the FETs.

 

[Albis2985]

Thanks Perry I still do not have the tutorial and precisely that is the transistor that I mention in post 2 when I lift it I have a nice square wave I understand then that by placing all the mosfet of the source the amplifier must turn on correctly or I am wrong

 

[Perry Babin]

The amp has protection to shut down when there is no rail voltage. Rail voltage can't build without the FETs in the circuit.

 

[Albis2985]

Thanks Perry I was looking for a problem where there was not the amplifier turned on correctly however I see that a zener is needed in location ZD301 is the same as those with F9 marked?

 

[Perry Babin]

ZD301 and ZD303 are listed as 15v Zeners.