Sony WRT-807B, Руководство по обслуживанию

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3-5
WRT-807B (U/CE)
3-2-4. Reference Frequency Deviation
Adjustment
Equipment and Tools
DC power supply
DC output voltage : + 1.5
±
0.1 Vdc
DC ammeter
Audio analyzer
Modulation analyzer
SMA-BNC (J) connector (Part No. J-6402-490-A)
RF conversion connector (Part No. J-6402-400-A)
AF input cable (See “How to make a AF input cable” on
page 3-1.)
Adjustor (Part No. 7-721-052-81)
Connections
(For connecting the DC power supply, refer to the
“Preparation” on page 3-2.)
Switch and Control Setting
Same as “Switch and Control Initial Setting” on page 3-3.
Procedure
(1) Input 1 kHz, _ 55 dBV( _ 52.8 dBm) signal to the AF
input connector (CN303/CN-1868 board) with AF input
cable.
(2) Connect the modulation analyzer to the antenna connec-
tor (CN305) with SMA-BNC (J) connector (and RF
conversion connector).
Set the modulation analyzer as below;
MEASUREMENT
: FM
MEASUREMENT RANGE : AUTO or
±
10 kHz
(manual operation)
HPF : 50 Hz
LPF : 15 kHz or 20 kHz
DE EMPHASIS : 50 u s
(3) Adjust
1
RV303 so that the frequency deviation for the
modulation analyzer reading meets the following speci-
fication.
Specification : Frequency deviation = Maximum
Adjustmen :
1
RV303/MB-860 board (B side)
(4) Adjust 1 RV304 so that the frequency deviation for the
modulation analyzer reading meets the following speci-
fication.
Specification : Frequency deviation = Maximum
Adjustment : 1 RV304/MB-860 board (B side)
(5) Adjust
1
RV302 so that the frequency deviation for the
modulation analyzer reading meets the following speci-
fication.
Specification : Frequency deviation =
±
5 kHz
±
0.1 kHz
Adjustment :
1
RV302/MB-860 board (B side)
(6) After the adjustment has been completed, perform the
“3-2-5. Maximum Frequency Deviation Adjustment”.
Audio analyzer
CN-1868 board
CN303
Modulation
analyzer
MB-860 board (B side)
RV304 RV303
RV302
CN305
Oscilloscope
AF OUT RF IN
Oscillator
Level meter
AF input cable
SMA-BNC (J) connector with RF conversion connector