Adjustments; Power Supply Voltage Check; Carrier Frequency Adjustment; Rf Power Output Adjustment - Sony WRT-822B 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
Preparation
1. When adjustments are performed, remove the MB-940
board (with battery terminal and Mic input connector)
from WRT-822B unit.
Refer to the "Section 2. Service Overview" for removal.
2. Connect the MM-SMA (J) connector (J-6402-480-A)
with SMA-BNC (J) connector (J-6402-490-A) to the an-
tenna connector (CN301) on the MB-940 board as
shown below.
CN301
3. Connecting the DC power supply.
Supply the DC power to the battery terminal springs as
shown below.
MB-940 Board
(B side)
DC power supply DC ammeter
DC output voltage : +3.0 ±0.1 V
Check
After the DC power supply connection is completed, set
the power switch (S500) to ON, and check the level on
DC ammeter.
DC ammeter indication level: 140 to 180 mA
SMA-BNC (J) connector
MM-SMA (J) connector
MB-940 Board
(A side)
Red
Black
Battery terminal
WRT-822B