Rf Squelch Level Check - Sony WRR-862A Service Manual

(6) Read the output level of the OUTPUT 1 (indication of
the audio analyzer).
This level is specified to be 0 dB.
(7) Change the MODULATION (Modulation frequency)
of the signal generator as follows, and check the output
level should be as follows.
n
100 Hz and 15 kHz modulation frequency must be set
by using the function generator.
MODULATION frequency
of signal generator
100 Hz
15 kHz
(8) Connect the signal generator to the ANT b connector,
and perform the procedures (5), (6) and (7).
Step 2. Tuner 2 Checking
(1) Set the CONTROL switch (S1601) to "2".
(2) Connect the audio analyzer to the OUTPUT 2 connec-
tor via the MIC amp.
(3) Connect the signal generator to the ANT a connector.
(4) Set the channel setting as follows;
. Tuner 2 channel setting
Same as "1. Switch and Control Initial Setting" on
page 3-2.
n
Set the Tuner 1 to channel setting different from the
above Tuner 2 channel setting.
(5) Perform the checking from the procedures (5) to (8) in
"Step 1. Tuner 1 checking".
When performing the above described checking change
the following detail as shown below.
OUTPUT 1 → OUTPUT 2
→ Tuner 2
Tuner 1
3-12
OUTPUT 1 connector
output level
_0.7 ± 1.0 dB
_28.5 ± 2.5 dB

3-2-8. RF Squelch Level Check

n
Perform this adjustment/check with the case (upper) , parti-
tion and battery case installed.
(Do under the regular use condition).
Equipment and Tools
Same as "3-2-5. S/N Checking".
Connection
Same as "3-2-5. S/N Checking".
Switch and Control Setting
Same as "1. Switch and Control Initial Setting" on page 3-2
expect the following setting.
SQUELCH switch : ON
(Set the RF squelch level to "10" )
Procedure
Step 1. Tuner 1 Checking
(1) Set the CONTROL switch (S1601) to "1".
(2) Set the channel setting as follows;
. Tuner 1 channel setting
Same as "1. Switch and Control Initial Setting" on
page 3-2.
n
Set the Tuner 2 to channel setting different from the
above Tuner 1 channel setting.
(3) Connect the signal generator to the ANT a connector.
(4) Set the signal generator as follows:
Signal generator setting
FREQUENCY(Carrier frequency):
CE21 model : 482.000 MHz
CE33 model : 578.000 MHz
CE62 model : 810.000 MHz
CE67 model : 850.000 MHz
U1416 model : 482.125 MHz
U3032 model : 578.125 MHz
U4244 model : 650.125 MHz
U6264 model : 770.125 MHz
U6668 model : 794.125 MHz
AU66 model : 799.250 MHz
RF OUTPUT (Output level) : 60 dBuV
MODULATION (Modulation frequency) : 1 kHz
DEVIATION (Frequency deviation) : ± 5 kHz
(5) Check that RF Indicator LED lights (green) and "NO
TONE" message appears on LCD (Tuner 1 ).
EMF
(= _53 dBm)
WRR-862A/862B