max-bit
Newbie level 5
I'm repairing Kenwood KA-5090R
It has on one DC channel at the output ...
Interestingly, it seems that the transistors in the OK and DC path are at the output - a topic for further analysis
But this is still a small problem, because there are two operational amplifiers IC7 and IC8 in the feedback circuit.
But the circuit is strange, the amp outputs are (cascaded) shorted to ground! What is this amp supposed to do? linearize gain? but how?
I don't get it ....![Eek! :eek: :eek:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Anyone seen something like this?![Stick out tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
![](https://obrazki.elektroda.pl/3027666800_1640421231_bigthumb.jpg)
It has on one DC channel at the output ...
Interestingly, it seems that the transistors in the OK and DC path are at the output - a topic for further analysis
But this is still a small problem, because there are two operational amplifiers IC7 and IC8 in the feedback circuit.
But the circuit is strange, the amp outputs are (cascaded) shorted to ground! What is this amp supposed to do? linearize gain? but how?
I don't get it ....
Anyone seen something like this?
![](https://obrazki.elektroda.pl/3027666800_1640421231_bigthumb.jpg)