4. TROUBLE SHOOTING
- 86 -
4.17.5 Checking PAM Control Signal (Tx pass continued)
Normal?
Check VRAMP,
PA_ON, PA_BAND
Control signal is OK. See next page to
Check FEM & Mobile SW
Download the SW
No
Yes
PA_ON
VRAMP
VRAMP
3dB Atten
4dB Atten
27p
C819
24
R500
1000p
1000p
C815
C816
C504
TX_ENABLE
4
VBATT
VRAMP
6
33u
27
28
GND19
GND2
11
29
GND20
GND21
30
31
GND22
GND23
32
12
GND3
13
GND4
14
GND5
GND6
15
16
GND7
17
GND8
GND9
18
GSM_IN
7
GSM_OUT
8
3
RF3166
U500
BAND_SELECT
2
1
DCS_PCS_IN
9
DCS_PCS_OUT
GND
5
GND1
10
19
GND10
GND11
20
GND12
21
22
GND13
23
GND14
GND15
24
GND16
25
26
GND17
GND18
300
R508
VBAT
220
R502
R822
0
220
R501
300
R507
18
R506
C814
100p
PA_BAND
PA_ON
VRAMP
RFOL
RFOH
Z3X-BOX.COM
Summary of Contents for MG220
Page 1: ...Date May 2006 Issue 1 0 Service Manual MG220 Service Manual Model MG220 Z 3 X B O X C O M ...
Page 3: ... 2 Z 3 X B O X C O M ...
Page 5: ...Z 3 X B O X C O M ...
Page 32: ...3 H W Circuit Description 31 Figure 14 Power Supply Scheme Z 3 X B O X C O M ...
Page 46: ...4 TROUBLE SHOOTING 45 4 TROUBLE SHOOTING 4 1 Main Components Placement Z 3 X B O X C O M ...
Page 93: ...5 DOWNLOAD 92 5 2 3 Configuration Setting C GSMULTI Model MG220 dll Z 3 X B O X C O M ...
Page 94: ...5 DOWNLOAD 93 5 2 4 Press Start Button Z 3 X B O X C O M ...
Page 95: ...5 DOWNLOAD 94 5 2 5 After Start Button Which Stand by condition Z 3 X B O X C O M ...
Page 96: ...5 DOWNLOAD 95 5 2 6 SW downloading Condition MG220 Z 3 X B O X C O M ...
Page 97: ...5 DOWNLOAD 96 5 2 7 SW downloading END Condition Z 3 X B O X C O M ...
Page 99: ...6 SERVICE AND CALIBRATION 98 4 Click on CALIBRATION START button Z 3 X B O X C O M ...
Page 108: ... 107 8 pcb layout Z 3 X B O X C O M ...
Page 109: ... 108 8 pcb layout Z 3 X B O X C O M ...
Page 113: ... 112 Z 3 X B O X C O M ...
Page 129: ...Note Z 3 X B O X C O M ...
Page 130: ...Note Z 3 X B O X C O M ...