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Flow Chart of Troubleshooting
7-2
AVDD_
HFA
V
D
D
_
IO
_
H
IG
H
AVDD
VCC_
RX_
T
X
VCC_
SYN
2.
6V
2.
8V
2.
9V
CLOSE_THE_I
/ O PI
N
2.
8V
1.
8V
VDD_
IO
_
L
OW
VDD_
CORE_
B
T
DC/DC Down Conveter(1.8Volt)
1.
8V
2.
6V
VDD_
4
V
SI
M_CLK
SI
M_RST
1.
8V
4V
VDD_SLEEP
2.
9V
SI
M_I
O
VDD_
GSM_
CORE
SI
M_VCC
C
408
C
411
C
402
BA
T4
00
L400
+VDD_
IO
_
L
OW
C
420
NC
8
NC
9
10
NC
VCC
1
2
RST
VCC
5
SI
M
400
CLK
3
4
GND
I/O
6
7
NC
C
403
C
414
C
416
C
419
C
404
CC
7V
-T
1A
OS
C4
00
2
1
GND
2
MODE
61
RUN
3
SW
VF
B
5
VI
N
4
C
406
U4
0
1
C
422
C4
2
4
R4
04
30
VS
AV
E
10
_IR
Q
27
_O
NK
EY
1
_R
EC
1
13
_R
EC
2
11
_R
ST
HC
44
_
S
IM
RSCD
7
_S
IM
RS
HC
40
SI
MD3
V
BAT
45
SI
M
E
N
42
SI
M
IOCD
9
SIM
IO
HC
41
SI
M
V
CC
31
VB
AT
32
VC
HG
29
VIN
T
RF1
V
DD
22
24
RF2
V
DD
2
SC
L
38
SCN
37
SCP
3
SD
A
43
SI
MCKCD
8
SIM
CK
HC
53
NC
NC
54
26
OS
CI
25
OS
CO
6
PW
RE
N1
5
PW
RE
N2
28
RE
FC
23
RF1
2
V
BAT
46
GPO3
HCVBAT
18
17
HCVDD
15
IO
D2
VBAT
IO
V
D
D
14
LPD1
VBAT
20
19
LPVDD
12
MIC
BIA
S
D2
VDD
16
39
D3
VDD
49
GND
GND
50
51
GND
GND
52
48
GPO1
47
GPO2
34
CH
GC
UR
/B
AT
MA
X
33
CH
GD
RV
4
CL
K3
2K
36
CP
VB
AT
35
CP
VD
D
21
D1
VDD
C
405
U
400
C4
2
3
R
400
C
412
V400
C4
1
3
C
417
C4
1
5
C
409
R
401
R409
L401
C
407
C
400
R
402
C4
2
1
C
418
V4
01
+VDD_I
O
_
LO
W
BU_
RST
C
401
RSTON
SI
M
R
ST
REF_
ON
+VDD_
IO
_
L
OW
VBAT
+VDD_
GSM_
CORE
+AVDD_
HFA
+
V
D
D
_
IO
_
H
IG
H
vcc
+VDD_
G_
A
32K
H
z
_D
IG
IT
VDD_SLEEP
REF_
ON
PON_TX
SCL
SDA
SI
M
C
LK
SI
M
IO
VBAT
IT
_
P
M
U
ONKEYN
AUX_
O
N
+VDD_RX_TX
+VCC_
SYN
MI
C_
BI
AS
+AVDD