Sony MB-806A, Service Manual

Page: 36 / 82

3-10 MB-806A (CE)
WRU-806A (CE, AU)
2. S/N 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 IN) switch: 0 dB
(2) Connect the audio analyzer to the TUNER OUTPUT 1
connector via MIC amp.
(3) Connect the signal generator to the ANTENNA A IN
connector with DC cut fixture.
(4) 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
DEVIATION (Frequency deviation):
±
5 kHz
(5) Read the output level of the TUNER OUTPUT 1
connector (Audio analyzer indication level). This level
is specified to be 0 dB.
(6) Turn OFF the MODULATION (modulation frequen-
cy) of the signal generator (No modulation).
(7) Check that output level of the TUNER OUTPUT 1 is
_
62 dB or less (S/N is 62 dB or more with A-weighted
filter) as compared with the level of procedure (4)
above.
(8) Change the RF OUTPUT (output level) of the signal
generator as shown below.
RF OUTPUT (output level): 20 dB u V
EMF
(= _ 93 dBm)
(9) Check that output level of the TUNER OUTPUT 1 is
_
50 dB or less (S/N is 50 dB or more with A-weighted
filter) as compared with the level of procedure (5)
above.
(10)Change the RF OUTPUT (output level) of the signal
generator as shown below.
RF OUTPUT (output level): 60 dB
u
V
EMF
(=
_
53 dBm)
(11)Set the audio analyzer to the distortion mode.
(12)Check that distortion ratio is _ 45 dB or less (0.56 % or
less) with A-weighted.
(13)Connect the signal generator to the ANTENNA B IN
connector with DC cut fixture.
(14)Perform the procedures (4) through (12) above.
(15)Set the channel and FREQUENCY (carrier frequency)
of the signal generator as shown
1
and
2
below.
Perform the procedures (1) to (14) above, for each
channel setting (
1
and
2
).
1
Channel setting:
CE62 model: Group 00, 6217 channel (800.125 MHz)
CE69 model: Group 00, 6901 channel (854.125 MHz)
AU66 model: Group 00, 6601 channel (792.250 MHz)
Signal generator setting:
FREQUENCY(Carrier frequency)
CE62 model: 800.125 MHz
CE69 model: 854.125 MHz
AU66 model: 792.250 MHz
2
Channel setting:
CE62 model: Group 00, 6363 channel (813.875 MHz)
CE69 model: Group 00, 6964 channel (862.000 MHz)
AU66 model: Group 00, 6751 channel (805.500 MHz)
Signal generator setting:
FREQUENCY(Carrier frequency):
CE62 model: 813.875 MHz
CE69 model: 862.000 MHz
AU66 model: 805.500 MHz
Step 2: Tuner
[2]
to
[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 (15)
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]
TUNER OUTPUT 1
→
TUNER OUTPUT 2, 3, 4, 5, and 6