
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Checking VCTCXO Circuit (Rx pass continued)
Checking Points
Checking Flow
VCTCXO Circuit Diagram
Waveform
PIN3
Crystal Output
PIN1
Crystal Input
PIN4
LDO Output
1u
RF2.85V
26MHz
GND
2
OUT
3
4
VCC
1
VCONT
C438
X400
R418 15K
1000p
C439
1000p
C437
TCXO_OUT
AFC
26MHz ?
Check Pin 3 of X400
Pin 4 2.85V ?
Check U403
No
No
VCTCXO circuit is OK
See next page to check
PLL circuits
Replace X400
Yes
Yes
Pin3
Pin4
Z3X-BOX.COM
Summary of Contents for MG210
Page 1: ...Date May 2006 Issue 1 0 Service Manual MG210 Service Manual Model MG210 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 45: ...4 2 KEYPAD Components Placement 4 TROUBLE SHOOTING 44 U301 MIC200 Z 3 X B O X C O M ...
Page 87: ...4 TROUBLE SHOOTING 86 Waveform PA_ON VRAMP Z 3 X B O X C O M ...
Page 93: ...5 DOWNLOAD 92 5 2 3 Configuration Setting C GSMULTI Model MG210 dll Z 3 X B O X C O M ...
Page 94: ...5 DOWNLOAD 93 5 2 4 Press Start Button MG210 Z 3 X B O X C O M ...
Page 95: ...5 DOWNLOAD 94 5 2 5 After Start Button Which Stand by condition MG210 Z 3 X B O X C O M ...
Page 96: ...5 DOWNLOAD 95 5 2 6 SW downloading Condition MG210 Z 3 X B O X C O M ...
Page 97: ...5 DOWNLOAD 96 5 2 7 SW downloading END Condition MG210 Z 3 X B O X C O M ...
Page 101: ... 100 Z 3 X B O X C O M ...
Page 106: ... 105 8 pcb layout Z 3 X B O X C O M ...
Page 107: ... 106 8 pcb layout Z 3 X B O X C O M ...
Page 111: ... 110 Z 3 X B O X C O M ...
Page 126: ...Note Z 3 X B O X C O M ...
Page 127: ...Note Z 3 X B O X C O M ...