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LAJ 26th February 2011 02:24 PM

Kenwood KRV5570
 
Need help on a KRV5570 tuner amplifier (without the "D" suffix). Need the values of R127 & R129 on the power supply/ amplifier board. Note this amp has transistors rather than chip amps.
A schematic would be appreciated. Thanks all!

mhifi508 24th March 2013 03:56 AM

Quote:

Originally Posted by LAJ (Post 2483804)
Need help on a KRV5570 tuner amplifier (without the "D" suffix). Need the values of R127 & R129 on the power supply/ amplifier board. Note this amp has transistors rather than chip amps.
A schematic would be appreciated. Thanks all!

I know this post is old. Just for record, I took the measurement and both are 3.9K. However, when I check the circuit, it stated as 39K, can some confirm?

Also what is the value of the R80, 10 ohm? Why these resisters only 1/4w which over heat until can not read the color code.

LAJ 25th March 2013 02:32 PM

Thanks for responding...
 
That's a good question.
3.9K seems right.
Why do they overheat till you can't read them?
I think my R80 is OK but I'll check the value and get back with you.
Thanks again.

mhifi508 25th March 2013 04:23 PM

Quote:

Originally Posted by LAJ (Post 3426596)
That's a good question.
3.9K seems right.
Why do they overheat till you can't read them?
I think my R80 is OK but I'll check the value and get back with you.
Thanks again.

LAJ, Thanks. I believe R127 and R129 act like a load resister. Anyway, I replaced with 39K and now less heat, just warm. My unit suffer power on and cut off before speaker relay activate. The problem is CN02 on the amp board bad contact. I cut off the wire and re insert again and the unit back in operation.

LAJ 25th March 2013 06:05 PM

Thanks!
 
I'll give that a try!


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