
3-5
WRR-855B
2. 1st Local Adjustment
Equipment and Tools
• DC power supply:
+
7.0
±
0.1 Vdc
• Spectrum analyzer
• Adjuster (0.4
x
1.3 mm) : 1 (Part No. 7-221-652-81)
• Ceramic capacitor 1 pF (Part No. 1-102-934-00)
• Power supply/AF OUT connector
(Refer to the ''How to make power supply/AF OUT
connector" on page 3-1).
Connection
Adjustment Location
Switch and Control Setting
Channel setting:
CE21 model; Group 00, 22-32 channel (482.000 MHz)
CE33 model; Group 00, 34-32 channel (578.000 MHz)
CE62 model; Group 00, 63-32 channel (810.000 MHz)
CE67 model; Group 00, 68-32 channel (850.000 MHz)
U14 model; Group 00, 16-01 channel (482.125 MHz)
U30 model; Group 00, 32-01 channel (578.125 MHz)
U42 model; Group 00, 44-01 channel (650.125 MHz)
U62 model; Group 00, 64-01 channel (770.125 MHz)
U66 model; Group 00, 68-01 channel (794.125 MHz)
MUTING: OFF
Adjustment Procedure
(1) Set the spectrum analyzer as follows:
CENTER FREQUENCY :
CE21 model; 632.750 MHz
CE33 model; 728.750 MHz
CE62 model; 960.750 MHz
CE67 model; 1000.750 MHz
U14 model;
632.875 MHz
U30 model;
728.875 MHz
U42 model;
800.875 MHz
U62 model;
920.875 MHz
U66 model;
944.875 MHz
n
Perform the center frequency setting by using the
signal generator.
REFERENCE LEVEL :
_
10 dBm
FREQUENCY SPAN : 50 kHz (5 kHz/DIV)
AMPLITUDE SCALE : 10 dB/DIV
ATT (Input attenuator) : 0 dB
(2) Connect the spectrum analyzer probe to the NOISE-
terminal (land) of the CPU-342 board with 1 pF
ceramic capacitor.
(3) Adjust the
1
CT751/CPU-342 board under condition (2)
above so that the frequency meets the specification below.
Specification:
CE21 model; 632.750 MHz
±
5 kHz
CE33 model; 728.750 MHz
±
5 kHz
CE62 model; 960.750 MHz
±
5 kHz
CE67 model; 1000.750 MHz
±
5 kHz
U14 model;
632.875 MHz
±
5 kHz
U30 model;
728.875 MHz
±
5 kHz
U42 model;
800.875 MHz
±
5 kHz
U62 model;
920.875 MHz
±
5 kHz
U66 model;
944.875 MHz
±
5 kHz
Adjustment:
1
CT751/CPU-342 board
+
7.0
±
0.1 Vdc
BNC cable
(50
Z
coaxial cable)
BNC-J connector
1 pF capacitor
NOISE
+
_
Spectrum
analyzer
Soldering
Power supply/AF OUT connector
DC power supply
CT751
ANT IN A
ANT IN B
CPU-342 board
Summary of Contents for WRR-855B
Page 1: ...UHF SYNTHESIZED TUNER UNIT WRR 855B SERVICE MANUAL 1st Edition Revised 2 ...
Page 4: ...2 WRR 855B 8 Schematic Diagrams TUN 8 8 1 CPU 342 8 8 DP 236 8 10 SW 814 8 10 ...
Page 10: ...1 6 WRR 855B Sony Corporation Printed in Japan ...
Page 38: ......
Page 58: ......
Page 67: ...7 1 WRR 855B 7 1 Section 7 Board Layouts ...
Page 83: ......
Page 84: ...Printed in Japan Sony Corporation 2006 6 16 2001 WRR 855B U CE E 9 976 898 03 ...