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Motorola GmbH, CSS Center, Mobile Devices
Title:
Troubleshooting-Guide V3
5.2 Keyboard Flex Assy
Customer complaint
- MKPxx / DIMxx / TONxx / DISxx
1. If some or all keys are not working or power up is impossible with the on/off
key, then perform a cross check with reference-housing. When all keys are
working, replace the Keyboard Flex Assy.
2. When the keyboard backlight is defect or intermittent, make a cross check
and if necessary change Keyboard Flex Assy.
3. If the display shows strange symbols or nothing at all also make a cross
check and replace Keyboard Flex Assy if it is necessary.
5.3 U900
Customer complaint
- TONxx / ALTxx / CHGxx
1. If the multi-media ring tones are not working, replace U900.
2. When the charging process is not working, U900 could be defect.
3. Check these voltages, if the phone has a power up problem. Connect PCB
with EMU Connector and check the current drain. If the current drain is only
~ 0.6 mA, measure following voltages:
Repair Support Information
PCAP 3
VBoost
~ 5.8V
VBuck
~ 1.9V
RF 5V REG
~ 5,0V
Please refer to Fig. 2
Doc. No:
Version:
Date:
Page:
at C921
at L920
at C933
© Copyright 2003-2005 Motorola Inc. All Rights reserved.
Motorola internal use
TSG_V3
1.1
09.06.2005
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