Most of the repairs I do on the KA9100's are limited to the budget of the person usually.
I like to change the caps on the amp boards and the back power supply. Caps need to be tested with a capacitance meter out of the circuit. Physical damage is obvious leaking or burst/bulging apart caps. The main caps are a PITA to change and aren't very many replacements out there I think someone posted a part in the Kenwood or DIY forum.
Also replacing the transistors in the amp sections (area of rail voltage ~57VOLTS) WITH MORE ROBUST transistors. There's 3 that I change there and change the offset adjust pot to a multi-turn pot for more accurate adjusting. You can usually find subjects on fixing most popular units on the forums by searching. Most of them have detailed fixes or someone being helped to fix theirs. Also part replacement substitutes and so on.
I usually add my .02 but I get too many messages asking for help. It takes too much of my time to keep responding to PMs etc etc ..
I like to change the caps on the amp boards and the back power supply. Caps need to be tested with a capacitance meter out of the circuit. Physical damage is obvious leaking or burst/bulging apart caps. The main caps are a PITA to change and aren't very many replacements out there I think someone posted a part in the Kenwood or DIY forum.
Also replacing the transistors in the amp sections (area of rail voltage ~57VOLTS) WITH MORE ROBUST transistors. There's 3 that I change there and change the offset adjust pot to a multi-turn pot for more accurate adjusting. You can usually find subjects on fixing most popular units on the forums by searching. Most of them have detailed fixes or someone being helped to fix theirs. Also part replacement substitutes and so on.
I usually add my .02 but I get too many messages asking for help. It takes too much of my time to keep responding to PMs etc etc ..
