Huawei U8815 Maintenance Manual page 6

U8815
Maintenance Manual
Figure 1-1 Appearance of the U8815 handset ....................................................................................................... 1
Figure 3-1 Exploded view diagram ....................................................................................................................... 4
Figure 4-1 PCBA components diagram 1 .............................................................................................................. 6
Figure 4-2 PCBA components diagram 2 .............................................................................................................. 7
Figure 4-3 PCBA components diagram 3 .............................................................................................................. 8
Figure 4-4 PCBA components diagram 4 .............................................................................................................. 8
Figure 5-1 Upgrade process diagram................................................................................................................... 10
The following figures show the procedures. ........................................................................................................ 13
Figure 9-1 Block diagram .................................................................................................................................... 20
Figure 9-2 Power-on management circuit diagram ............................................................................................. 21
Figure 9-3 Troubleshooting process for no current ............................................................................................. 24
Figure 9-4 Troubleshooting process for weak current ......................................................................................... 25
Figure 9-5 Troubleshooting process for high current .......................................................................................... 26
Figure 9-6 Charging management circuit diagram 1 ........................................................................................... 27
Figure 9-7 Charging management circuit diagram 2 ........................................................................................... 27
Figure 9-8 Charging management circuit diagram 3 ........................................................................................... 27
Figure 9-9 Charging management circuit diagram 4 ........................................................................................... 28
Figure 9-10 Troubleshooting process for charging failures ................................................................................. 29
Figure 9-11 19.2 MHz circuit block diagram 1 ................................................................................................... 30
Figure 9-12 19.2 MHz circuit block diagram 2 ................................................................................................... 31
Figure 9-13 32.768 kHz circuit block diagram 1 ................................................................................................. 31
Figure 9-14 Analysis of clock circuit .................................................................................................................. 31
Figure 9-15 Flash memory circuit diagram 1 ...................................................................................................... 33
Figure 9-16 Flash memory circuit diagram 2 ...................................................................................................... 33
Figure 9-17 Flash memory circuit diagram 3 ...................................................................................................... 34
Figure 9-18 Flash memory circuit diagram 4 ...................................................................................................... 35
Issue 1.0 (2012-02-13) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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