Table of Contents
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ONKEYN
C412
R402
C414
VBAT
C415
C416
V400
R403
+VDD_RX_TX
C417
L402
+VCC_SYN
C419
+VDD_G_A
C420
+AVDD
C421
+AVDD_HFA
C427
R407
+VDD_IO_HIGH
C429
R408
+VDD_IO_LOW
C430
R409
510
MIC_BIAS
RSTON
IT_PMU
SIMIO
OSC400
25
26
27
28
29
30
24
RF2VDD
23
RF12VBAT
22
RF1VDD
21
D1VDD
20
LPD1VBAT
U405
19
LPVDD
18
HCVBAT
17
HCVDD
16
D2VDD
15
IOD2VBAT
14
IOVDD
13
_REC2
12
11
10
9
C428
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C410
C411
BU_RST
C413
Backup_Battery
C418
1000nF
31
32
33
34
35
36
10V
37
SCP
38
SCN
R404
100K
39
D3VDD
40
SIMD3VBAT
41
SIMVCC
42
SIMIOCD
43
SIMCKCD
44
_SIMRSCD
45
SIMEN
46
GPO3
47
GPO2
48
GPO1
GND 49
50
GND
GND 51
52
GND
NC 53
54
NC
8
7
6
5
4
3
2
1
TP400
7-9
Flow Chart of Troubleshooting
VDD_SLEEP
SIM400
1
+VDD_IO_LOW
VCC
2
RST
3
CLK
4
GND
SIM_VCC
5
VCC
6
IO
SIM_IO
7
NC
8
NC
SIM_CLK
9
NC
10
NC
SIM_RST
C423
C422
C426
5000-6P-2.3M
C424
C425
2.3T SIM
AUX_ON
SCL
SDA
32KHz_DIGIT
PON_TX
REF_ON
SIMRST
SIMCLK
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