Sony MB-806A Service Manual page 43

9. Tone squelch 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: 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):
CE62 model; 806.125 MHz
CE69 model; 858.125 MHz
AU66 model; 799.250 MHz
RF OUTPUT (Output level): 60 dBuV
MODULATION (Modulation frequency):
DEVIATION (Frequency deviation): ± 1.4 kHz
(4) Turn on and off the MODULATION (modulation
frequency) of the signal generator as follows, and the
LCD indicator (Tuner [1]) changes also as follows.
MODULATION ON/OFF
on signal generator
ON
OFF
(5) Connect the signal generator to the ANTENNA B IN
connector with DC cut fixture, and perform the
procedures (3) and (4) above.
MB-806A (CE)
WRU-806A (CE, AU)
EMF
(= _53 dBm)
32.768 kHz
(32.768 kHz must be set
by connecting Function
generator)
LCD indication of Tuner [1] [1] [1] [1] [1]
GP/CH indication (LCD):
CE62 model; "00. 6301" appears.
CE69 model; "00. 6933" appears.
AU66 model; "00. 6701" appears.
GP/CH indication (LCD):
"NO TONE" appears.
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 (5)
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]
10. DC +9 V OUT voltage check
Equipment and Tools
. DC voltmeter (digital multi meter)
. Metal film resistor 91 Z 2W (Part No. 1-214-609-00)
Procedure
(1) Connect the DC voltmeter to the ANTENNA A IN/DC
9 V OUT connector with 91 Z resistor as shown figure
below.
DC voltmeter
+
BNC connector
_
91 Z
2 W
Shield
(2) Check that DC output voltage of ANTENNA A IN/DC
9 V OUT connector is +8.6 ± 0.6 Vdc.
(3) Connect the DC voltmeter to the ANTENNA B IN/DC
9 V OUT connector with 91 Z resistor.
(4) Check that DC output voltage of ANTENNA B IN/DC
9 V OUT connector is +8.6 ± 0.6 Vdc.
ANTENNA
ANTENNA
A IN B IN
MB-806A
3-17