Audio Volume - Rotel RDV-985 Technical Manual

5. Audio Volume

Is sound
NO
CN704 is
output from
checked
headphone?
IC850
Q851,Q852
is checked
The position of
the screw
fastening the
front panel is
confirmed.
This screw : because
there is working
of the ground.
Is
digital signal
output from
IC702"7"?
YES
Is
digital signal output
from IC701"20"?
YES
Is digital
signal output from
IC702"10", "13", "16"
and "19"?
YES
Check IC703, IC704
and their periphery.
All manuals and user guides at all-guides.com
Power
supplied correctly
to each IC?
Is sound
signal output
from J702 (pin
jack)?
YES NO
Is sound
output from
headphone?
YES
Check Q711,
OK
Q712 and J702
(soldered part).
NO
Check IC702
and PLL.
NO
Replace
IC701.
NO
Replace
IC702.
NO
to Power Supply
Volume
YES
IC702 are supplied
*
power from IC718.
Check I/O voltage of IC718.
Voltage of
NO
Q708 collector at
-12V?
YES
* PLL normal lock voltage
Between TP701 and TP702.
When fs=44.1kHz
When fs=48kHz
When fs=96kHz
* Changing over the cutoff frequency of analog LPF
When fs=44.1kHz or 48kHz,
Microcomputer port FS2 is at the "L" level,
and Q703 and Q704 are turned ON.
When fs=96kHz,
Microcomputer port FS2 is at the "H" level,
and Q703 and Q704 are turned OFF.
Approx
. 5V
NO
IC714 is
checked
YES
0.6V
0.9V
2.6V