Aiwa TN-C137 Service Manual page 10

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