JVC XV-M565BK Service Manual page 28

XV-M565BK/M567GD
5. Audio Volume
Is
digital signal
input to
IC703"2"?
YES
Is digital
signal output from
IC703"10", "13", "16"
and "19"?
YES
Check IC751, IC741
and their periphery.
1-28
Power
supplied correctly
to each IC?
Is sound
signal output
from J701 (pin
jack)?
YES NO
OK
Voltage of
Q791 collector at
-5.5V?
NO
Check IC703
and PLL.
NO
Replace
IC703.
NO
to Power Supply
Volume
YES
NO
IC701 is
checked
YES
* Changing over the cutoff frequency of analog LPF
When fs=44.1kHz or 48kHz,
Microcomputer port FS2 is at the "L" level,
and Q741 and Q751 are turned ON.
When fs=96kHz,
Microcomputer port FS2 is at the "H" level,
and Q741 and Q751 are turned OFF.