VK Corporation VK2000+, Service Manual

Page: 33 / 76

VK Quality Group GSM C/S
☞
☞
Overall Structure
Overall Structure
US
B
_
D
E
T
AVCC
V_CORE
V_BAT
PW
M
1
LE
D
_
E
N
3V3
/RD
SI
M
C
L
K
SI
M
_
IO
LC
D
_
D
IM
500
Power
SI
M
C
LK
PW
M
1
CH
G
BAT
_
V
OL
T
DC
O
N
/R
E
SET
SI
M
R
S
T
UP
_
O
N
_
O
F
F
C
L
K
13M
_
E
N
EN
_
V
IB
SI
M
_
P
W
R
E
N
SI
M
_
1V
8/
3
V
SI
M
D
A
T
A
V_BAT
CH
G
_
IN
SI
M
_
R
S
T
SI
M
_
C
L
K
SI
M
_
IO
V_CORE
VCC
V
C
C_
RTC
BAT
_
R
T
C
SI
M
_
VC
C
A2V8
D2V8
VI
BR
AT
O
R
BUZZER
ON_OFF
AVCC
LE
D
_
E
N
LE
D
_
O
U
T
BUZZER
US
B
_
L
D
O
_
E
N
RXD
V_BAT
SI
M
_
1V
8/
3
V
A1
700
LCD/KEY/ETC
/RD
/L
C
S
/WR
D2V8
D
[0
..7
]
RE
C
_
P
RE
C
_
N
LC
D
_
D
IM
R
ESET
_
2
V
8
KE
Y
_
E
L
B
U
ZZE
R
MI
C
IP
MI
C
IN
ON
_
O
F
F
LE
D
_
O
U
T
/G
1
_
D
IR
1
C
O
L
[0
..4
]
R
O
W
[0
..4
]
A1
V_CORE
VC
C
_
R
T
C
VCC
MI
C
IP
C
L
K
13M
_
E
N
UP
_
O
N_
O
F
F
SI
M
_
R
S
T
BAT
_
T
EM
P
HS_KEY _DET
/WR
800
HOLE
V_BAT
V_CORE
A2V8
V_CORE
KE
Y
_
E
L
RE
C
_
N
EN
_V
IB
200/300/600
GSM/GPRS Module
PW
M
1
CT
S
RE
C
_
N
AVCC
/L
C
S
MI
C
IN
D
[0
..7
]
TX
D
TM
S
/P
C
M
_
S
Y
NC
VCC
SI
M
C
LK
V_CORE
RE
C
_
P
RX
D
H
S
_R
EC
_N
LC
D
_
D
IM
RT
S
MI
CI
P
HS
_
D
E
T
H
S
_M
IC
_N
CH
G
BAT
_
VOLT
DC
O
N
UP
_
O
N
_
O
F
F
C
L
K
13M
_
E
N
EN
_VI
B
SI
M
_
P
W
R
E
N
S
IM
_
1V
8/
3V
SI
M
R
ST
SI
M
D
AT
A
VC
C
_
R
T
C
BOO
T
U
SB_
D
+
U
SB_
D
-
HS
_
R
E
C
_
P
HS
_
M
IC
_
P
T
D
O/
P
C
M
_
OU
T
T
D
I/P
C
M
_
IN
TC
K
/P
C
M
_
C
L
K
V_BAT
3V3
J
T
AG_N
T
R
ST
H
S
_
K
EY_
D
E
T
BAT
_T
E
M
P
US
B
_
D
E
T
RTC
K
R
ESET
_
2
V
8
LE
D
_
E
N
/G
1
_
D
IR
1
KEY_
EL
U
SB_
LD
O
_
EN
C
O
L[
0.
.4
]
R
O
W
[0
..4
]
/R
D
/W
R
/R
E
SET
A1 UA
R
T
_
S
W
VCC
BAT
_
V
OLT
CTS
HS
_
R
E
C
_
P
BOO
T
LED_OUT
/RESET
VIBRATOR
RE
C
_
P
D[
0
..
7
]
/L
C
S
3V3
BAT
_
R
T
C
TDI/PCM_IN
RT
CK
TCK/PCM_CLK
SI
M
R
ST
SI
M
D
AT
A
R
O
W
[0
..4
]
D2V8
TXD
TDO/PCM_OUT
SI
M
_
C
L
K
HS
_
R
E
C
_
N
AVCC
H
S
_M
IC
_P
CO
L
[0
..
4
]
U
SB_
D
-
HS
_
M
IC
_
N
DC
O
N
A3
1 8 , 11 04, 2005
100 Top Schematic
1BP2
Do Not Copy
Model Name
size
Rev
Data Sheet
of
Circuit Name
/G
1
_
D
IR
1
400
Peripherals
SI
M
_
R
S
T
SI
M
_
C
L
K
SI
M
_
IO
B
A
T_
TE
M
P
SI
M
_
V
C
C
RXD
CTS
RTS
TMS/PCM_SY NC
TXD
BOO
T
BAT
_
R
T
C
CH
G
_
IN
U
SB_
D
-
US
B
_
D
+
TDO/PCM_OUT
TDI/PCM_IN
TCK/PCM_CLK
V_BAT
3V3
USB_DET
J
T
AG_
N
T
R
ST
RTC
K
A2V8
VI
BR
AT
O
R
H
S
_
KEY_
D
E
T
H
S
_M
IC
_P
H
S
_M
IC
_N
HS
_
D
E
T
H
S
_R
E
C
_P
H
S
_R
E
C
_N
USB_LDO_EN
VCC
V_CORE
UA
R
T
_
S
W
D2V8
SI
M
_
V
C
C
J
T
AG_
N
T
R
ST
A2V8
RTS
R
ESET
_
2
V
8
VCC
TMS/PCM_SY NC
SI
M
_
PW
R
E
N
U
SB_
D
+
MI
C
IN
CH
G
UA
R
T
_
S
W
ON_OFF
V_CORE
CH
G
_
IN
HS
_
D
E
T