Sony WRT-807B, Service Manual

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3-2
WRT-807B (U/CE)
3-2. Adjustments
This section describes the following adjustments and checks
required to satisfy specifications.
Adjustment and Check Items
3-2-1. Power Supply Voltage Check
3-2-2. Carrier Frequency Adjustment
3-2-3. RF Power Output Adjustment
3-2-4. Reference Frequency Deviation Adjustment
3-2-5. Maximum Frequency Deviation Adjustment
3-2-6. Distortion Ratio Check
3-2-7. S/N Check
3-2-8. Frequency Characteristics Check
3-2-9. Tone Signal Adjustment
3-2-10.Battery Alarm Signal Check
3-2-11.Spurious Emissions Check
Preparation
1. Remove the MB-860 board, DP-306 board and CN-
1868 board from WRT-807B unit, and then the MB-
860, DP-306 and CN-1868 boards must be connected
electrically as shown below.
Refer to the “Section 2. Service Overview “ for removal.
2. Connect the SMA-BNC (J) connector (J-6402-490-A)
with RF conversion connector (J-6402-400-A) to the
antenna connector (CN305) on the MB-860 board as
shown below.
3. Connecting the DC power supply
Supply the DC power to the battery terminals on the
MB-860 board as shown below.
Check
After the DC power supply connection is completed, set
the power switch (S101) to ON, and check the level on DC
ammeter.
DC ammeter indication level : 150 to 175 mA
GND
VCC
MB-860 board (B side)
DC power supply DC ammeter
+
+ _
_
Lead wire
Solder.
CN200
CN304
CN-1868 board
DP-306 board
MB-860 board
RF conversion
connector
CN305
(B side)
1.5 ± 0.1 V dc
SMA-BNC (J) connector