Sony WLL-RX55, Maintenance Manual

Page: 54 / 230

3-4 (E)
WLL-RX55
600
Z
Audio oscillator
GND
1
2
3
4
5
X
Y
220 u F
(16 V or more)
+
PROD CANCEL Adjustment
1. Set the switch S42 on the AU-297 board to PROD.
2. Equipment: Oscilloscope
Test Point: D17 (GND : D15)/EX-854 board
Adjustment Point: 1 RV101/AU-297 board
Specifications: A = Minimize
(less than 20 mV p-p)
ENG CANCEL Adjustment
3. Set the switch S42 on the AU-297 board to ENG.
4. Equipment: Oscilloscope
Test Point: D17 (GND : D15)/EX-854 board
Adjustment Point:
1
RV201/AU-297 board
Specifications: B = Minimize
(less than 20 mV p-p)
Settings after Adjustment
.
Return the settings of the internal switches/controls to
the initial settings. (Refer to Section 1-7.)
1 RV553/AU-297 board
→
Mechanical center
S41/AU-297 board
→
REMOTE
S42/AU-297 board
→
RPOD
S101, S201/AU-297 board
→
4W
S207/SW-1183 board
→
CM
. Restore the AU-297 board to the original position.
3-2-2. RTS Intercom Adjustment
Tools
. Oscilloscope: Tektronix TDS3054B or equivalent
. Audio oscillator: Tektronix SG-5010 or equivalent
.
Extension board: EX-854
(Sony Part No.: A-8344-228-A)
Note
This adjustment is described on the premise that the output
impedance of the audio oscillator is 600
Z .
Preparations
1. Connect the resistances of 200 Z between A19 and
GND, and A21 and GND of the extension board EX-
854.
2. Turn OFF the power of the unit, and extend the AU-
297 board using the EX-854 board.
3. Set the internal switches/controls.
(Refer to Section 1-7.)
1
RV553/AU-297 board
→
Fully counterclock-
wise (
3 )
S41/AU-297 board
→
LOCAL
S101, S201/AU-297 board
→
RTS
MIC switch/front panel
→
ON
S207/SW-1183 board
→
CM
4. Turn ON the power of the unit, and warm up the unit
for about ten minutes.
5. Input a sine wave of 1 kHz, 220 mV p-p (
_
20 dBu)
from the audio oscillator to 2-pin (X), 1-pin (Y) and 3-
pin (G) of the INTERCOM connector on the front
panel.
A
B
S1
S101
S2
S201
S3
S4
S41
S42
S91
S92
S93
TP351
TP401
TP451
TP551
E301
E401
E601
RV101
RV201
RV351
RV401
RV451
RV551
RV552
RV553
RV554
A
B C D E F G H J
K
1
2
3
4
5
AU-297 BOARD (A SIDE)