Sony WRU-806B Service Manual page 21

9. Tone Squelch Check
Procedure
n
The checking procedures describe that the WRU-806B (to
be adjusted) is installed into the Tuner [1] slot on the MB-
X6.
(1) Set the MB-X6 as follows :
WRU-806B Front panel (Tuner [1])
Channel setting :
CE38 model ; Group 00, 3932 channel (618.000 MHz)
U30 model ; Group 00, 3201 channel (578.125 MHz)
U42 model ; Group 00, 4401 channel (650.125 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):
CE38 model ; 618.000 MHz
U30 model ; 578.125 MHz
U42 model ; 650.125 MHz
RF OUTPUT (Output level) : 60 dBuV
MODULATION (Modulation frequency) : 32.768 kHz
(32.768 kHz must be set by connecting Function generator)
DEVIATION (Frequency deviation)
(4) Turn on and off the MODULATION (modulation fre-
quency) of the signal generator as follows, and the LCD
indicator (Tuner [1]) changes also as follows.
MODULATION ON/OFF LCD indication of Tuner [1]
on signal generator
ON GP/CH indication (LCD):
CE38 model ; "3932" appears.
U30 model
U42 model
OFF GP/CH indication (LCD) :
(5) Connect the signal generator to the ANTENNA B IN
connector with DC cut fixture, and perform the proce-
dures (3) and (4) above.
WRU-806B
(= _53 dBm)
EMF
: ± 1.4 kHz
[1] [1]
[1] [1]
; "3201" appears.
; "4401" appears.
"NO TONE" appears.
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
B IN
A IN
MB-X6
2-13