4. TROUBLE SHOOTING
- 70 -
4.15 Earphone Trouble
Block Diagram
Earphone Detecting Operation
• The ABB operates A/D conversion continuously and if the voltage of “HOOK_DETECT” node
goes to about 40mV, it detects hook switch is pushed in call state.
• First - “HOOK_DETECT” had Pull up by V_IO
• Second - “HOOk_DETECT” Change to Pull Down by Mic resistor of Earmic
Earphone Sending Path
• HSMICP is the audio signal from the microphone of the earphone.
• R215, C219,L200 and R216 make the path of the audio signal from the microphone of the
earphone.
• This audio signal is delivered to ABB(IOTA).
Earphone Receiving Path
• ABB_HSO is the audio signal from ABB(IOTA).
• C218,R212 and R214 make the path of the audio signal from ABB to earphone.
Ear jack
R208
1K
C218
10u
68p
C221
22K
R219
4.7
R216
C216
10u
J200
1
2
3
4
5
C223
27p
47K
R211
0
R215
R213
22
V_IO
R209
10K
R210
5.6K
1K
R217
100nH
L200
82
R214
VA201
VA200
C217
R212
100
47p
C214
4.7u
33K
R218
C224
27p
C222
27p
NA
C220
0.1u
C219
HOOK_DETECT
JACK_DETECT
HSMICP
ABB_HSO
HSMICBIAS
Receiver
GND
MIC
EAR_JACK SPEC
Z3X-BOX.COM
Содержание MG220
Страница 1: ...Date May 2006 Issue 1 0 Service Manual MG220 Service Manual Model MG220 Z 3 X B O X C O M ...
Страница 3: ... 2 Z 3 X B O X C O M ...
Страница 5: ...Z 3 X B O X C O M ...
Страница 32: ...3 H W Circuit Description 31 Figure 14 Power Supply Scheme Z 3 X B O X C O M ...
Страница 46: ...4 TROUBLE SHOOTING 45 4 TROUBLE SHOOTING 4 1 Main Components Placement Z 3 X B O X C O M ...
Страница 91: ...5 DOWNLOAD 90 5 2 Download Procedure 5 2 1 Computer Program file MultiGSM EXE Click Z 3 X B O X C O M ...
Страница 93: ...5 DOWNLOAD 92 5 2 3 Configuration Setting C GSMULTI Model MG220 dll Z 3 X B O X C O M ...
Страница 94: ...5 DOWNLOAD 93 5 2 4 Press Start Button Z 3 X B O X C O M ...
Страница 95: ...5 DOWNLOAD 94 5 2 5 After Start Button Which Stand by condition Z 3 X B O X C O M ...
Страница 96: ...5 DOWNLOAD 95 5 2 6 SW downloading Condition MG220 Z 3 X B O X C O M ...
Страница 97: ...5 DOWNLOAD 96 5 2 7 SW downloading END Condition Z 3 X B O X C O M ...
Страница 99: ...6 SERVICE AND CALIBRATION 98 4 Click on CALIBRATION START button Z 3 X B O X C O M ...
Страница 108: ... 107 8 pcb layout Z 3 X B O X C O M ...
Страница 109: ... 108 8 pcb layout Z 3 X B O X C O M ...
Страница 113: ... 112 Z 3 X B O X C O M ...
Страница 129: ...Note Z 3 X B O X C O M ...
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