Reference Frequency Deviation Adjustment; Maximum Frequency Deviation Adjustment - Sony WRT-800A Service Manual

3-2-3. Reference Frequency Deviation
Adjustment
Equipment and Tools
DC power supply
DC output voltage:+1.5± 0.1 Vdc
DC current meter
Audio analyzer
Modulation analyzer
MEASUREMENT
MEASUREMENT RANGE : AUTO or ± 10 kHz
HPF
LPF
DE EMPHASIS
Adjustor (SONY part No.7-721-052-81)
AF input connector (See page 3-2.)
RF adjusting connector (See page 3-2.)
Switch and control setting
S301, S302, S303, S304/ RF-87 board (A-side)
WRT-800A S301
AU66 model _
Connections
(For connecting the DC power supply, refer to the "Prepa-
rations" on page 3-3.)
Level meter
Audio analyzer
Oscillator
RF adjusting Connector
SMA-BNC
conversion connector
Modulation
analyzer
RF-87 Board
(B side)
RF IN
Oscilloscope
3-5
: FM
: 50 Hz
: 20 kHz or 15 kHz
: 50 us
S302 S303 S304 Channel
setting
0 1 OFF 67-01
AF input connector
CN101
(B side)
1
RV101
1
RV102
1
RV104
AU-258 Board
(A side)
Procedure
(1) Input 1 kHz, _43.5 dBV (_41.3 dBm) signal to the
CN101/AU-258 board with AF input connector.
n 0 dBV=1 Vrms, 0 dBm=0.775 Vrms
(2) Adjust 1RV104 so that frequency deviation for the
modulation analyzer reading meets the following
specification.
Specification : Frequency deviation=± 5 kHz± 0.1 kHz
Adjustment : 1RV104/AU-258 board (A side)
(3) After the adjustment has been completed, perform the

"3-2-4. Maximum Frequency Deviation Adjustment".

3-2-4. Maximum Frequency Deviation
Adjustment
n
Be sure to perform this adjustment after "3-2-3. Reference
Frequency Deviation Adjustment" has been completed.
Equipment and Tools
DC power supply
DC output voltage : +1.5± 0.1 Vdc
DC current meter
Audio analyzer
Modulation analyzer
MEASUREMENT
MEASUREMENT RANGE : AUTO or ± 100 kHz
HPF
LPF
DE EMPHASIS
Oscilloscope
Adjustor (SONY part No.7-721-052-81)
AF input connector (See page 3-2.)
RF adjusting connector (See page 3-2.)
Switch and control setting
S301, S302, S303, S304/ RF-87 board (A-side)
WRT-800A S301
AU66 model _
Connections
Same as "3-2-3.Reference Frequency Deviation
Adjustment".
: FM
: 50 Hz
: 20 kHz or 15 kHz
: 50 us
S302 S303 S304 Channel
setting
0 1 OFF 67-01
WRT-800A (AU)