Motorola C168 Manual - Page 2

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INDEX

1. Debug guide ............................................................................................................................. 3

1.1

Baseband circuit Debug guide...................................................................................... 3

1.1.1

Phone is Dead ....................................................................................................... 3

1.1.2

SIM Card Detection Error .................................................................................... 4

1.1.3

Audio Fail ............................................................................................................. 5

1.1.3.1

Headset Fail ..................................................................................................... 5

1.1.3.2

Speaker Fail..................................................................................................... 6

1.1.3.3

Handset Microphone Fail............................................................................... 7

1.1.3.4

Earphone Speaker Fail................................................................................... 8

1.1.4

LCM Fail .............................................................................................................. 8

1.1.5

Charger Fail .......................................................................................................... 9

1.1.6

Vibrator Fail........................................................................................................ 10

1.1.7

FM function Fail ................................................................................................. 10

1.2

Radio Frequency circuit troubleshooting ................................................................... 11

1.2.1

26MHz System clock fail ................................................................................... 11

1.2.2

RF signal diagram in GSM900 Tx mode............................................................ 12

1.2.3

RF signal diagram in DCS1800 TX mode.......................................................... 13

1.2.4

RF signal diagram in GSM900 Rx mode ........................................................... 14

1.2.5

RF signal diagram in DCS1800 RX mode.......................................................... 15