Sony WRT-800A, Руководство по обслуживанию

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WRT-800A (AU)
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 : FM
MEASUREMENT RANGE : AUTO or
±
10 kHz
HPF : 50 Hz
LPF : 20 kHz or 15 kHz
DE EMPHASIS : 50
u
s
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 S302 S303 S304 Channel
setting
AU66 model _ 0 1 OFF 67-01
Connections
(For connecting the DC power supply, refer to the “Prepa-
rations” on page 3-3.)
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
1
RV104 so that frequency deviation for the
modulation analyzer reading meets the following
specification.
Specification : Frequency deviation=
±
5 kHz
±
0.1 kHz
Adjustment : 1
RV104/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 : FM
MEASUREMENT RANGE : AUTO or
±
100 kHz
HPF : 50 Hz
LPF : 20 kHz or 15 kHz
DE EMPHASIS : 50 u s
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 S302 S303 S304 Channel
setting
AU66 model _ 0 1 OFF 67-01
Connections
Same as “3-2-3.Reference Frequency Deviation
Adjustment”.
3-5
Level meter
Audio analyzer
Oscillator
AF input connector
RF adjusting Connector
CN101
(B side)
SMA-BNC
conversion connector
Modulation
analyzer
Oscilloscope
RF-87 Board
(B side)
AU-258 Board
(A side) RF IN
1
1
1
RV101
RV102
RV104