Rotel RDV-985, Техническое руководство

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5. Audio Volume
Power
supplied correctly
to each IC?
to Power Supply
Volume
YES
NO
OK
*
Is sound
signal output
from J702 (pin
jack)?
Is sound
output from
headphone?
Is sound
output from
headphone?
Check Q711,
Q712 and J702
(soldered part).
Voltage of
Q708 collector at
-12V?
Is
digital signal
output from
IC702"7"?
NO
Check IC702
and PLL.
YES
Is
digital signal output
from IC701"20"?
NO
Replace
IC701.
Is digital
signal output from
IC702"10", "13", "16"
and "19"?
Replace
IC702.
Check IC703, IC704
and their periphery.
When fs=44.1kHz
When fs=48kHz
When fs=96kHz
0.6V
0.9V
2.6V
* PLL normal lock voltage
Between TP701 and TP702.
* 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
YES
YES YES
YES
NO NO NO
NO
YES
NO
YES
CN704 is
checked
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.
IC714 is
checked
IC702 are supplied
power from IC718.
Check I/O voltage of IC718.
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