Adjustments; Power Supply Voltage Check; Carrier Frequency Adjustment; Rf Power Output Adjustment - Sony WRT-847A Service Manual

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
3-2-12. Occupied Band width Check
3-2
Preparation
1. Remove the MB-914 board, DP-341 board, RF-96 board
and CN-2055 board from WRT-847A/847B unit, and
then the MB-914, DP-341, RF-96 boards must be con-
nected electrically as shown below.
Refer to the "Section 2. Service Overview" for removal.
2. Connect the RF adjusting cable (J-6402-390-A) with RF
conversion connector (J-6402-490-A) to the antenna
connector (CN402) on the RF-96 board as shown below.
3. Connecting the DC power supply
Supply the DC power to the battery terminals on the
MB-914 board as shown below.
RF adjusting cable
RF conversion
connector
CN402
(B side)
CN401
CN402
RF-96 board
DC ammeter
+
–
Solder
VCC
Check
After the DC power supply connection is completed, set
the power switch (S301) to ON, and check the level on
DC ammeter.
DC ammeter indication level: 140 to 200 mA
CN201
DP-341 board
MB-914 board (A side)
CN302
CN303
DC power supply
+
–
3.0 ± 0.1 Vdc
Solder
GND
MB-914 board (A side)
WRT-847A/847B