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MT8820A
Anritsu MT8820A Service Manual
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Docum
ent No.: M-W
1940BE-3
.0
Measurement Solutions
A
NRITSU CORPOR
A
TION
T
o ensure th
at this equip
ment is u
sed safely
, impo
r-
tant safet
y items are e
xplained
in the MT
8820A Op-
eration Manual. This document ex
plains important
service items
related to se
rvice. R
ead both th
e op-
eration manu
al and this documen
t, and keep
both
wit
h the MT
8820A.
MT8820A
Radio Communicat
ion A
nalyzer
Serv
ice
Manual
Third
Edit
ion
2
Table of Contents
Table of Contents
6
For Safety
3
About this Manual
5
Table of Contents
6
General
7
Circuit Description
7
Outline
10
Circuit Description
10
Signal Lines Description
18
Circuit Description of each Unit
23
A01 Main CPU Unit
23
A41, A42 WCDMA COM Unit
26
A51, A52 WCDMA BB Unit
29
A61, A62 MEAS DSP Unit
31
A02 DAC/ADC Unit
35
A71, A72 RF Unit
38
A7104, A7204 if
41
A7103, A7203 Rf
41
A7102, A7202 Output AMP
41
A7101, A7201 Input LPF
41
A81, A82 Local Unit
42
A04 Reference Unit
47
A05 Mother Board
51
A07 Panel Control Unit
52
Power Supply Unit
55
A21, A22 TDMA COM Unit
56
A03 AUDIO Unit
61
Table of Contents
65
Outline
66
Service Kits
66
Troubleshooting
66
Instruments Required for Troubleshooting
69
Circuit Reference
70
Outline of Troubleshooting Procedure
71
Overall Troubleshooting
71
Power and Control Troubleshooting
72
Output Frequency Troubleshooting
74
Input Frequency Troubleshooting
77
Output Level Troubleshooting
78
Txpower Troubleshooting
80
Section 4 4 4 4 Adjustment Andsectionsectionadjustment and C C C C Ompensationadjustment Andompensation
83
Adjustment and Compensation
84
Outline
84
Instruments Required for Adjustment and Compensation
85
Change Parts on A01 MAIN CPU UNIT
86
Carrier Leak Adjustment
87
Output Level and Input Frequency Character Compensation
90
FM Deviation Adjustment
91
Table of Contents
93
Mechanical Configuration
94
Outline
94
Cabinet and Shield Case Assembly
95
Main Unit Removal
97
Removing A01 MAIN CPU (1)
97
Removing A02 DAC/ADC (7)
97
Removing A41, A42 WCDMA COM
97
Removing A51, A52 WCDMA BB (5, 9)
97
Removing A61, A62 MEAS DSP (6, 8)
97
Removing A04 REFERENCE (18)
98
Removing A71, A72 RF (14, 15)
98
Removing A81, A82 LOCAL (16, 17)
98
Removing A05 MOTHER BOARD (19)
99
Removing A07 PANEL CONTROL (20)
99
Removing A09 KEY PANEL (21)
99
Removing POWER DIVIDER (25)
99
Removing POWER SUPPLY UNIT (22)
99
Removing A03 AUDIO (13)
100
Removing A21 / A22 TDMA COM (2, 12)
100
Removing S-ATT (23) and (24)
100
Built-In Option Unit
101
Built-In Option Analog Unit (for Parallel Phone)
102
Parts Lists
103
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Anritsu MT8820A Specifications
General
Brand
Anritsu
Model
MT8820A
Category
Measuring Instruments
Language
English
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