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IC7 SP-PHONE CIRCUIT
SPEAKER
MICROPHONE
IC9
Off-hook
monitor
control
Q12
HANDSET
HANDSET
CIRCUIT
H/S VOLUME
Q14
Q15
SW1
HOOK SW
SW2
Ringer SW
+5V
LCD
CN1
Q20
Q18
Q21
SP-PHONE
VOLUME
Q16
IC8
Tone control
IC2
+5V
CPU
X1
8MHz
CLK,DATA,E
Q10
CONTRAST control
RX
TX
IC9
Side tone
control
CK2M,SYNC
IC3
CODEC
+5V
+5V
IC10
W.OHCA
RESET
control
Ringer vol.
RESET
control
Q999
+5V
DTMF generator
INTRX,INTTX
A0,A1,IOR,IOW
D0
D3
OP0,OP1
IC1
RXA,RXB
GATE
DATA
COMMUNICATION
ARRAY
TXA,TXB
IC4,Q1
DPT
+5V
communic
ation
Power circuit
IC5,Q3,Q4,D2
+5V
LED
control
X2
16.384 MHz
Power control circuit
Q200,Q201,Q202
LED
R0,R1,R4,R5
DRIVE
Q5 Q9
C0 C4
KEY OUT 1 5
KEY IN 0 5
KEY
HOLD KEY
TEL JACK
T1
JK1
D1
LED
D100
D110
1AP:PSUP1315Z
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