3-2
WRT-822B
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.
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.
Connecting the DC power supply.
Supply the DC power to the battery terminal springs as
shown below.
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
CN301
MB-940 Board
(A side)
MM-SMA (J) connector
SMA-BNC (J) connector
MB-940 Board
(B side)
DC power supply
DC ammeter
DC output voltage :
+
3.0
±
0.1 V
Red
Black
Battery terminal
Summary of Contents for WRT-822B
Page 1: ...UHF SYNTHESIZED TRANSMITTER WRT 822B SERVICE MANUAL 1st Edition ...
Page 4: ...2 WRT 822B 7 Board Layout MB 940 7 1 8 Schematic Diagrams MB 940 8 1 ...
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Page 46: ...Printed in Japan 2001 3 11 Sony Corporation 2001 WRT 822B U CE E 9 976 897 01 ...