Repair KIPUS MZ-70 (very similar SPL DYNAMICS D7S)

yoppi

Member
2016-01-17 2:57 pm
Hello

I repaired power supply a of amplifier KIPUS MZ-70, (amplifier very similar to SPL DYNAMICS D7s), suffered a reverse polarity and exploited all transistors (IRFP064N) and gate transistors and IC TL494.
Is completely repaired the amplifier and transmit audio without distortion, but I have noticed that the output transistors (IRPF360LC), slightly increases its temperature without charge ... The transistor gate has a square wave and the voltage rail is + 122v and -126v ...
Why this increase in temperature of the IRFP360LC?

Greetings.
 

yoppi

Member
2016-01-17 2:57 pm
Hello

Yes, all are heated equally and at the same time. I will try to load (in the car with subwoofer) and I say happen.
Perri, what procedure you use to make sure the transistors mosfet output a digital amplifier are working properly and will not have problems in the future?

Greetings and thanks.