Sony MB-806A Service Manual page 40

6. AF level indicator/AF indicator check
Procedure
Step 1: Tuner [1] (Tuner unit 1) checking
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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 dBuV
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
Tuner [1]
on signal generator
± (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.
3-14
EMF
(= _53 dBm)
[1] [1] [1] [1]
AF
AF
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]
MB-806A (CE)
WRU-806A (CE, AU)