Sony MB-806A, Service Manual

Page: 31 / 82

3-5 MB-806A (CE)
WRU-806A (CE, AU)
(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:
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
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
1 6 2 3 4 5
Signal
generator
MIC amp
Audio
analyzer
DC cut fixture
ANTENNA A IN
Tuner
Oscilloscope
DC cut fixture
ANTENNA B IN
MB-806A
WRU-806A
600 Z
balance
input
RV202 RV201
Tuner unit (WRU-806A)
TUNER
OUTPUT 1
RF-92 board
(CE69)
. CE69 model
(CE62)
.
CE62 model
(AU66)
. AU66 model
AU 66
CE69
CE62