Sony MB-806A, Service Manual

Page: 40 / 82

3-14 MB-806A (CE)
WRU-806A (CE, AU)
6. AF level indicator/AF indicator check
Procedure
Step 1:
Tuner
[1]
(Tuner unit 1) checking
n
The checking procedures describe that the WRU-806A(to
be adjusted) is installed into the Tuner
[1]
slot on the MB-
806A.
(1) Set the MB-806A as follows;
Front panel (Tuner
[1]
)
Channel setting:
CE62 model; Group 00, 6301 channel (806.125 MHz)
CE69 model; Group 00, 6933 channel (858.125 MHz)
AU66 model; Group00, 6701 channel (799.250 MHz)
Muting: OFF
Rear panel
ATT (ANTENNA A, B) switch: 0 dB
(2) Connect the signal generator to the ANTENNA A IN
connector with DC fixture.
(3) Set the signal generator as follows:
Signal generator setting
FREQUENCY(carrier frequency):
CE62 model; 806.125 MHz
CE69 model; 858.125 MHz
AU66 model; 799.250 MHz
RF OUTPUT (Output level): 60 dB
u
V
EMF
(= _ 53 dBm)
MODULATION (Modulation frequency): 1 kHz
(4) Increase gradually DEVIATION (frequency deviation)
of the signal generator starting from
±
3 kHz, and
check that the deviation of the signal generator is
±
(5.0
±
1.0) kHz with the AF indicator as follows.
DEVIATION setting AF indicator of
on signal generator Tuner
[1] [1]
[1] [1] [1]
±
(5.0
±
1.0) kHz AF level indicator (LCD);
Lights.
AF indicator (LED);
Lights.
Less than AF level indicator (LCD);
±
(5.0
±
1.0) kHz Goes out.
AF indicator (LED);
Goes out.
(5) Connect the signal generator to the ANTENNA B IN
connector with DC cut fixture, and perform the
procedures (3) and (4) above.
Step 2: Tuner
[2]
to Tuner
[6]
checking
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 (4)
of “Step 1. Tuner
[1]
(Tuner unit 1) checking” on the
respective tuner units that are installed in the MB-806A.
When performing the above described checking change the
following details as shown below, of the “Step 1. Tuner
[1]
(Tuner unit 1) checking”.
Tuner
[1]
→
Tuner
[2]
,
[3]
,
[4]
,
[5]
, and
[6]
AF
AF