4-15 (E)
MAV-555
4-6-2. Analog Audio Input Adjustment
Preparation
.
AUDIO REC/PB level control knob (CH-1 to CH-4)/
meter panel
→
PRESET
.
INPUT button/meter panel
→
Lights up
.
ANALOG CH-1 to CH-4 buttons/meter panel
→
Lights up
.
Press either R1 or R2 button on the meter panel in
accordance with the port to which the AD-160 board is
connected.
Adjustment Procedure
Set an audio analyzer as follows.
Adjustment mode : LEVEL, dBm (600
Z
)
Input filter :
80 kHz low-pass filter
CH-1 adjustment
1.
Short TP501 (D-2) /AD-160 board and E501 (B-3) /
AD-160 board using a shorting clip.
2.
Connect the audio signal (1 kHz,
+
4 dBm) to the
AUDIO INPUT CH-1 connector/BKMA-570 of the
port to which the AD-160 board is connected.
3.
Press the MONITOR button of the MONITOR
SELECT block on the meter panel. Press then the CH-
1 button to turn it on. (The CH-1 signal is outputted to
the MONITOR OUT-L connector.)
n
Turn off the ANALOG CH-2 to CH-4 buttons.
4.
Equipment : Audio analyzer
Test point : AUDIO MONITOR OUT-L connector/
rear panel
Adj. point :
1
RV501 (C-3) /AD-160 board
Spec. :
+
4.0
±
0.1 dBm (600
Z
load)
5.
Remove the shorting clip from AD-160 board TP501
and E501.
6.
Equipment : Audio analyzer
Test point : AUDIO MONITOR OUT-L connector/
rear panel
Adj. point :
1
RV502 (D-3) /AD-160 board
Spec. :
+
4.0
±
0.1 dBm (600
Z
load)
CH-4 adjustment
1.
Short TP802 (L-3) /AD-160 board and E801 (L-3) /
AD-160 board using a shorting clip.
2.
Connect and set an oscilloscope as follows.
TRIG :
CH-2,
_
slope
3.
Equipment : Oscilloscope
Test point : TP409 (J-4)/AD-160 board
Adj. point :
1
RV804 (J-3)/AD-160 board
Spec.:
As specified by the waveform of TP409
(AUDIO CH-4) shown below.
4.
Remove the shorting clip from AD-160 board TP802
and E801.
4-6. AD-160 Board Adjustment
TP407
16-Bit
4-Bit
16-Bit
4-Bit
16-Bit
4-Bit
16-Bit
4-Bit
TP408
(OK)
TP409
(OK)
Audio CH-1
Audio CH-2
NG
NG
Audio CH-3
Audio CH-4
TP502
E501
TP408
E401
TP407
1
1 1
RV504
TP602
1
RV604
TP702
E801
TP409
1 1
R
V704
R
V804
TP802
TP501
RV501
R
V502
1
2
3
4
5
6
8
9
7
A
B
C
D
E
F
G
H
J
K
L
AD-160 board (A side)