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Huawei Ascend G300 Maintenance Manual
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U8815
Maintenance Manual
About This Document
Issue 1.0 (
2012
-
02
-
13
)
Huawei Propr
ietary and Confidential
Copyright © Huawei Technologies Co., L
td.
ii
About This Docume
nt
Purpose
Prepared by
R&D personn
el
Date
2012-02-
20
Reviewed by
Maintenance su
pport team
Date
2012-02-
23
Approved by
Service r
epresentati
ve
Date
2012-02-
23
Change History
Date
Version
Change
Reason
Section
Descriptio
n
Author
2012-02-
23
V1.0
Re
leased the fi
rst draft
.
R&D personnel
2
4
Table of Contents
Table of Contents
4
Product Introduction
10
Appearance
10
Features
10
Figure 1-1 Appearance of the U8815 Handset
10
Table 1-1 Description of the Features
10
Maintenance Instructions
12
Applicable Scope
12
Precautions
12
Obtaining Product and Maintenance Information
12
Exploded View
13
Figure 3-1 Exploded View Diagram
13
Table 3-1 List of Components in the Exploded View
13
PCBA Components
15
Figure 4-1 PCBA Components Diagram 1
15
Figure 4-2 PCBA Components Diagram 2
16
Figure 4-3 PCBA Components Diagram 3
17
Figure 4-4 PCBA Components Diagram 4
17
Software Upgrade
18
Upgrade Preparation
18
Upgrade Process
18
Table 5-1 Upgrade Preparation
18
Figure 5-1 Upgrade Process Diagram
19
Maintenance Tools
20
Table 6-1 List of Maintenance Tools
20
Disassembly Procedure
22
Assembly Procedure
26
Principles and Failure Analysis
29
Block Diagram and Handset Introduction
29
Figure 9-1 Block Diagram
29
Baseband Unit
30
Power-On Management Circuits
30
Figure 9-2 Power-On Management Circuit Diagram
30
Table 9-1 List of Voltages Converted from VHP_PWR by PM8029 Power Management Chip
32
Figure 9-3 Troubleshooting Process for no Current
33
Figure 9-4 Troubleshooting Process for Weak Current
34
Charging Management Circuits
35
Figure 9-5 Troubleshooting Process for High Current
35
Figure 9-6 Charging Management Circuit Diagram 1
36
Figure 9-7 Charging Management Circuit Diagram 2
36
Figure 9-8 Charging Management Circuit Diagram 3
36
Figure 9-9 Charging Management Circuit Diagram 4
37
Figure 9-10 Troubleshooting Process for Charging Failures
38
Clock Circuit
39
Figure 9-11 19.2 Mhz Circuit Block Diagram 1
39
Table 9-2 Description of the Signals in the Circuit Diagram in this Section
39
Figure 9-12 19.2 Mhz Circuit Block Diagram 2
40
Figure 9-13 32.768 Khz Circuit Block Diagram 1
40
Figure 9-14 Analysis of Clock Circuit
40
Flash Memory Circuit
41
Figure 9-15 Flash Memory Circuit Diagram 1
42
Figure 9-16 Flash Memory Circuit Diagram 2
42
Figure 9-17 Flash Memory Circuit Diagram 3
43
Figure 9-18 Flash Memory Circuit Diagram 4
44
Figure 9-19 Analysis of the U8815 Memory Interface
45
Table 9-3 Description of the Signals in the Circuit Diagram in this Section
45
RF Unit
46
Figure 9-20 Transmitting and Receiving Circuit Block Diagram
46
Power Amplifier
47
Figure 9-21 WCDMA IMT PA Diagram
47
Table 9-5 Logic Table of the RF Switch
47
Figure 9-22 WCDMA 850 PA Diagram
48
Figure 9-23 WCDMA PCS PA Diagram
48
Figure 9-24 GSM Quad_Band_Pa Diagram
48
Troubleshooting
49
Figure 9-25 UMTS IMT RX INTERSTAGE CHAIN Diagram
49
Figure 9-26 Diagram of Dualband RF Transmitting and Receiving by Using RTR6285A Chip
49
Figure 9-27 Troubleshooting Process for Receiving Failure
50
Table 9-6 Truths for Control Signals
51
Figure 9-28 Troubleshooting Process for Transmission Failure
52
Peripheral Circuits
53
Display Screen
53
Figure 9-29 Display Screen Circuit Diagram 1
54
Figure 9-30 Display Screen Circuit Diagram 2
54
Figure 9-31 Display Screen Circuit Diagram 3
55
Figure 9-32 Troubleshooting Process for no LCD Display
56
Table 9-4 Description of the Signals in the Circuit Diagram in this Section
56
Table 9-8 Description of the Signals in the Circuit Diagram in this Section
56
Vibration
57
Figure 9-33 Motor Circuit Diagram
57
Call Reception
58
Figure 9-34 Vibration Maintenance Process
58
Table 9-9 Description of the Signals in the Circuit Diagram in this Section
58
Figure 9-35 Call Reception Circuit Diagram 1
59
Figure 9-36 Call Reception Circuit Diagram 2
59
Figure 9-37 Call Reception Circuit Diagram 3
59
Figure 9-38 Call Reception Circuit Diagram 4
60
Figure 9-39 7227A Audio Processing Diagram
60
Table 9-10 Audio Output
61
Call Transmission
62
Figure 9-40 Troubleshooting Process for Sound Failure
62
Figure 9-41 Primary Handset Microphone Circuit Diagram
63
Figure 9-42 Secondary Handset Microphone Circuit Diagram
64
Figure 9-43 Troubleshooting Process for Sound Failure
65
Table 9-11 Description of the Signals in the Circuit Diagram in this Section
65
Headset
66
Figure 9-44 Headset Circuit Block Diagram
66
Figure 9-45 Troubleshooting Process for no Sound from the Headset Failure
67
Table 9-12 Description of the Signals in the Circuit Diagram in this Section
67
SIM Card
68
Figure 9-46 SIM Card Circuit Diagram
68
I/O Connector
69
Figure 9-47 Troubleshooting Process for the UIM Card Detection Failure
69
Table 9-7 Description of the Signals in the Circuit Diagram in this Section
69
Table 9-13 Description of the Signals in the Circuit Diagram in this Section
69
Microsd Card Connector
70
Figure 9-48 I/O Connector Circuit Diagram
70
Table 9-14 Description of the Signals in the Circuit Diagram in this Section
70
Figure 9-49 Microsd Card Connector Circuit Diagram
71
Figure 9-50 Troubleshooting Process for Micorsd Card Read Failure
72
Figure 9-51 FM Circuit Diagram 1
72
Figure 9-52 FM Circuit Diagram 2
73
Figure 9-53 FM Circuit Diagram 3
73
Figure 9-54 Troubleshooting Process for FM Radio Failure
74
Table 9-15 Description of the Signals in the Circuit Diagram in this Section
74
Solder Points on the PCB and BGA Chip
75
Figure 10-1 Diagram 1 of the Solder Points on the PCB and BGA Chip
75
Figure 10-2 Diagram 2 of the Solder Points on the PCB and BGA Chip
76
Figure 10-3 Diagram 3 of the Solder Points on the PCB and BGA Chip
76
Figure 10-4 Diagram 4 of the Solder Points on the PCB and BGA Chip
77
Performance Test
78
Keys
78
Figure 11-1 U8815 Handset Key
78
MMI Test
79
Voice Call Test
80
Other manuals for Huawei Ascend G300
User Guide
69 pages
Quick Start Guide
205 pages
4
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Huawei Ascend G300 Specifications
General
Brand
Huawei
Model
Ascend G300
Category
Cell Phone
Language
English
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