Sony MB-806A Service Manual page 31

(22)Set the FREQUENCY(carrier frequency) of the signal
generator as follows;
FREQUENCY(carrier frequency):
CE62 model; 811.000 MHz
CE69 model; 861.000 MHz
AU66 model; 804.000 MHz
(23)Check first that indication "L" of "BC3L" on the LCD
(Tuner [1]) has disappeared, and then press the S708
switch on the RF-92 board (WRU-806A, Tuner [1]).
(24)Indication on the LCD (Tuner [1]) appears as follows:
LCD:
. CE62 model
CE62
. CE69 model
CE69
. AU66 model
AU
Adjustment is completed. (Normal operation mode)
Step 3: Tuner [2] to Tuner [6] adjustment
When the WRU-806A Tuner Unit is installed in the Tuner
[2] (Tuner unit 2) to Tuner [6] (Tuner unit 6) of the MB-
806A, perform the adjustments from procedures (1) to (23)
of "Step 2. Tuner [1] (Tuner unit 1) Adjustment" on the
respective tuner units that are installed in the MB-806A.
When performing the above described adjustments change
the following details as shown below, of the "Step 2. Tuner
[1] (Tuner unit 1) Adjustment."
Tuner [1] → Tuner [2], [3], [4], [5], and [6]
Tuner unit 1 → Tuner unit 2, 3, 4, 5, and 6
MB-806A (CE)
WRU-806A (CE, AU)
(CE62)
(CE69)
66
(AU66)
2. Output level adjustment
Perform this adjustment when the TUNER OUTPUT
levels deviate from the specification.
Preparation
Before the adjustments, turn off the POWER switch of the
MB-806A, and perform the following.
1. Remove the case cover of the MB-806A.
2. Remove the tuner unit (WRU-806A) to be adjusted
from the MB-806A. Refer to " Section 1. Operating
Instructions " for removal.
3. Remove the upper side case lid of the tuner unit
(WRU-806A), and insert the tuner unit (WRU-806A)
to the slot of the MB-806A.
Equipment and Tools
. Audio analyzer (level meter, distortion meter)
. Mic amp (Noise meter)
. Oscilloscope
. Adjuster (0.4 x 1.3 mm): (Part No. 7-221-652-81)
. DC cut fixture (See the "How to make DC cut fixture"
on page 3-1.)
Connection/Adjustment Location
Signal
TUNER
generator
OUTPUT 1
DC cut fixture
ANTENNA A IN
1 2 3
Tuner
WRU-806A
RV202 RV201
RF-92 board
Tuner unit (WRU-806A)
Audio
MIC amp
analyzer
600 Z
balance
input
Oscilloscope
DC cut fixture
ANTENNA B IN
MB-806A
4 5 6
3-5