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MMBT3904
10
SCHEMATIC DIAGRAM-4 (HANDSET FRONT/ZENER SECTION)
HANDSET FRONT C. B
ZENER DIODE C. B
MMBT3906
RX-PWR
CONTROL
0.1
33/10
TMP87C405M-1K46
C10
10/16
C9
0.01
0.1
1.8M
KTC9014C
Q1
KTC9014C
0.1
0.1
10/16
10/16
5
6
7
8
9
10
11
12
ROW0
ROW1
ROW2
COL3
COL2
COL1
COL0
47/16
R10
2.2k
R12
2.2k
23
4.7k
VDD
C901
0.1
REC_VOL
C17
C18
C15
C16
470p
470p
470p
470p
U901
TC74VHC20FT/
SN74L
V20A(PW)
LED,SE3001DT
RED
TALK
Q8
MMBT3906
RING-VOL
Q6
RING-AMP
Q1, 2, 4
MCU RESET
HANDSET FRONT C. B
ZENER DIODE C. B
MMBT3906
RX-PWR
CONTROL
0.1
33/10
TMP87C405M-1K46
C10
10/16
C9
0.01
0.1
1.8M
KTC9014C
Q1
KTC9014C
0.1
0.1
10/16
10/16
5
6
7
8
9
10
11
12
ROW0
ROW1
ROW2
COL3
COL2
COL1
COL0
47/16
R10
2.2k
R12
2.2k
23
4.7k
VDD
C901
0.1
REC_VOL
C17
C18
C15
C16
470p
470p
470p
470p
U901
TC74VHC20FT/
SN74L
V20A(PW)
LED,SE3001DT
RED
TALK
Q8
MMBT3906
RING-VOL
Q6
RING-AMP
Q1, 2, 4
MCU RESET
HANDSET FRONT C. B
ZENER DIODE C. B
MMBT3906
RX-PWR
CONTROL
0.1
33/10
TMP87C405M-1K46
C10
10/16
C9
0.01
0.1
1.8M
KTC9014C
Q1
KTC9014C
0.1
0.1
10/16
10/16
5
6
7
8
9
10
11
12
ROW0
ROW1
ROW2
COL3
COL2
COL1
COL0
47/16
R10
2.2k
R12
2.2k
23
4.7k
VDD
C901
0.1
REC_VOL
C17
C18
C15
C16
470p
470p
470p
470p
U901
TC74VHC20FT/
SN74L
V20A(PW)
LED,SE3001DT
RED
TALK
Q8
MMBT3906
RING-VOL
Q6
RING-AMP
Q1, 2, 4
MCU RESET
HANDSET FRONT C. B
ZENER DIODE C. B
MMBT3906
RX-PWR
CONTROL
0.1
33/10
TMP87C405M-1K46
C10
10/16
C9
0.01
0.1
1.8M
KTC9014C
Q1
KTC9014C
0.1
0.1
10/16
10/16
5
6
7
8
9
10
11
12
ROW0
ROW1
ROW2
COL3
COL2
COL1
COL0
47/16
R10
2.2k
R12
2.2k
23
4.7k
VDD
C901
0.1
REC_VOL
C17
C18
C15
C16
470p
470p
470p
470p
U901
TC74VHC20FT/
SN74L
V20A(PW)
LED,SE3001DT
RED
TALK
Q8
MMBT3906
RING-VOL
Q6
RING-AMP
Q1, 2, 4
MCU RESET