Output Level Adjustment - Sony WRU-806B Service Manual

(22)Set the FREQUENCY (carrier frequency) of the signal
generator as follows :
FREQUENCY (carrier frequency) :
CE38 model ; 629.000 MHz
U30 model ; 589.000 MHz
U42 model ; 661.000 MHz
(23)Check first that indication "L" of "BC3L" on the LCD
(WRU-806B, Tuner [1]) has disappeared, and then
press the "CH" button on the front panel (WRU-806B,
Tuner [1]).
(24)Transit from indication "BACKUP" to indication "FIN-
ISH", and then indication on the LCD (WRU-806B,
Tuner [1]) appears as follows :
LCD :
. CE38 model
CE38
(CE38)
Adjustment is completed. (Normal operation mode)
WRU-806B
. . U30 model
U30
(U30)
. . U42 model
U42
(U42)

2-2-2. Output Level Adjustment

n
Perform the adjustment with the WRU-806B installed in
the MB-X6.
Perform this adjustment when the TUNER OUTPUT levels
deviate from the specification.
Preparation
Before the adjustments, turn off the POWER switch of the
MB-X6, and perform the following.
1. Remove the case cover of the MB-X6.
2. Remove the upper side case lid of the tuner unit (WRU-
806B to be adjusted), and insert the tuner unit (WRU-
806B) to the Tuner [1] slot of the MB-X6.
Equipment and Tools
. Tuner base unit MB-X6
. Audio analyzer (level meter, distortion meter)
. Microphone amplifier (noise meter)
. Oscilloscope
. Adjuster (0.4 x 1.3 mm) : (Part No. 7-221-052-81)
. DC cut fixture (Refer to the "How to make DC cut
fixture".)
Connection/Adjustment Location
Signal
TUNER
generator
OUTPUT 1
DC cut fixture
ANTENNA A IN
1 2 3 4 5
Tuner slot
RV402 RV401
RF-155 board
Tuner unit (WRU-806B)
Microphone Audio
analyzer
amplifier
600 Z
balance
input
Oscilloscope
DC cut fixture
ANTENNA B IN
MB-X6
6
2-5