Maintenance Manual

Maintenance Manual
2
Contents
1 H1822B Module Features ..............................................................................................................3
1.1 H1822B.. .....................................................................................................................................3
1.2 Basic Feature .............................................................................................................................3
1.3 Typical Application .....................................................................................................................3
2 Mainboard overview ......................................................................................................................5
3 Detailed Function Circuit ..............................................................................................................7
3.1 Download Module ......................................................................................................................7
3.2 Audio Module .............................................................................................................................8
3.2.1 Micphone Circuit .....................................................................................................................8
3.2.2 Receiver Circuit ......................................................................................................................9
3.2.3 Speaker Circuit .......................................................................................................................9
3.3 FM Module ............................................................................................................................... 10
3.3.1 FM Circuit (built-in) ............................................................................................................... 10
3.4 BT Module ................................................................................................................................ 10
3.5 ATV Module.............................................................................................................................. 11
3.6 WIFI Module ............................................................................................................................. 11
3.7 RF Module ................................................................................................................................ 11
3.8 LCM Module ............................................................................................................................. 12
3.9 CAMERA MODULE ................................................................................................................. 13
3.10 KEYPAD interface ................................................................................................................. 14
4.1 RF Part ..................................................................................................................................... 15
4.2 BB Part .........................................................................................................
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