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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

Motorola internal use

TSG_V3

1.1

09.06.2005

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