Sony WRR-855B, Service Manual, Page: 23 / 84

3-7
WRR-855B
Step2: ANT IN B side adjustment
(1) Connect the signal generator to the ANT IN B connec-
tor.
(2) Connect the DC voltmeter to the RSSI (B) terminal of
the CPU-342 board.
(3) Perform the procedures (3) through (6) in step 1 above.
Perform the same adjustment with the components
listed below on the right.
ANT IN A side ANT IN B side
1
CT105, CT106,CT302,
1
CT405, CT406, CT303
T101 and T102 T401 and T402
/TUN-8 board /TUN-8 board
RSSI (A)
→
RSSI (B)
4. Muting Level and RF Level Adjustment
This adjustment is performed automatically by the learning
function of the WRR-855B (RSSI learning).
Equipment and Tools
• DC power supply:
+
7.0
±
0.1 Vdc
• Signal generator
• Power supply/AF OUT connector
(Refer to the ''How to make power supply/AF OUT
connector" on page 3-1.)
Connection
ANT IN A ANT IN B
POWER switch
S701
+
–
+ 7.0 ± 0.1 Vdc
Signal
generator
SW-814 board
CPU-342 board
Power supply/AF OUT connector
DC power supply
Switch and Control Setting
Channel setting: Any channel setting
MUTING: OFF
Procedure
Step1: Set the signal generator as follows:
Signal generator setting
FREQUENCY (Carrier frequency):
CE21 model; 471.000 MHz
CE33 model; 567.000 MHz
CE62 model; 799.000 MHz
CE67 model; 839.000 MHz
U14 model;
471.000 MHz
U30 model; 567.000 MHz
U42 model; 639.000 MHz
U62 model; 759.000 MHz
U66 model; 783.000 MHz
RF OUTPUT (Output level): 30 dB
µ
V
EMF
( = _ 83 dBm)
MODULATION (Modulation frequency) : OFF
(No modulation)
Step2: Adjustment
(1) Connect the signal generator to the ANT IN A connec-
tor.
(2) Turn OFF the POWER switch (S901 switch on the
SW-814 board).
(3) Set the RF OUTPUT (output level) of the signal
generator to the OFF.
(4) Turn ON the POWER switch (S901 switch on the SW-
814 board) with the S701 switch on the CPU-342
board.
(5) Indication on LCD (display) appears as follows:
LCD :
(6) Set the RF OUTPUT (output level) of the signal
generator to the ON.
(-sqL-) (A C1L)
A