Sony WRR-801A Service Manual page 32

7. Muting level check
Procedure
Step 1: Tuner [1] (Tuner unit 1) checking
(1) Set the WRR-801A as follows;
Front panel (Tuner [1])
Channel setting: Group 00, 6901 channel
(800.125 MHz)
Muting: ON (Normal mode)
Rear panel
ATT (ANTENNA A, B) switch: 0 dB
(2) Connect the signal generator to the ANTENNA A IN
connector with DC cut fixture.
(3) Set the signal generator as follows:
Signal generator setting
FREQUENCY (Carrier frequency): 800.125 MHz
RF OUTPUT (Output level): 60 dBuV
MODULATION (Modulation frequency): 1 kHz
DEVIATION (Frequency deviation): ± 5 kHz
(4) Check that RF Indicator LED lights (green) and "NO
TONE" message appears on LCD (Tuner [1]).
(5) Change the RF OUTPUT (output level) of the signal
generator as shown below.
RF OUTPUT (output level): 20 dBuV
(6) Check that RF Indicator LED goes off (green) and
"NO TONE" message disappears on LCD (Tuner [1]).
(7) Increase gradually the RF OUTPUT (output level) of
the signal generator. Check that RF OUTPUT (output
± 5 dB at when RF Indicator
level) is 25 dBuV
EMF
lights (green LED) and "NO TONE" message appears
on LCD (Tuner [1]).
(8) Connect the signal generator to the ANTENNA B IN
connector with DC cut fixture, and perform the
procedures (3) through (7) above.
3-14
EMF
(= _53 dBm)
EMF
(= _93 dBm)
(9) Set the channel setting (Tuner [1]) and FREQUENCY
(carrier frequency) of the signal generator as shown 1
and 2 below.
Perform the procedures (1) to (8) above, for each
channel setting (1 and 2).
1 Channel setting (Tuner [1]):
Group 00, 6801 channel
(794.125 MHz)
Signal generator setting:
FREQUENCY (carrier frequency); 794.125 MHz
2 Channel setting (Tuner [1]):
Group 00, 6947 channel
(805.875 MHz)
Signal generator setting:
FREQUENCY (carrier frequency); 805.875 MHz
Step 2: Tuner [2] to Tuner [6] checking
When the TUNER UNIT WRU-801A is installed in the
Tuner [2] (Tuner unit 2) to Tuner [6] (Tuner unit 6) of the
WRR-801A, 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 WRR-
801A.
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]
WRR-801A
WRU-801A