Marantz ZC4001 Service Manual page 46

IC22 : TC74VHCT08AFT
IC24 : TC74VHC244F
IC23 : TC74VHC08TTR
51
IC25 : ST202EBW
TTL / CMOS INPUTS
TTL / CMOS OUTPUTS
PIN DESCRIPTION
PIN No SYMBOL
1 C + Positive Terminal for the first Charge Pump Capacitor
1
2 V+ Doubled Voltage Terminal
3 C - Negative Terminal for the first Charge Pump Capacitor
1
4 C + Positive Terminal for the second Charge Pump Capacitor
2
5 C - Negative Terminal for the second Charge Pump Capacitor
2
6 V- Inverted Voltage Terminal
7 T2 Second Transmitter Output Voltage
OUT
8 R2 Second Receiver Input Voltage
IN
9 R2 Second Receiver Output Voltage
OUT
10 T2 Second Transmitter Input Voltage
IN
11 T1 First Transmitter Input Voltage
IN
12 R1 First Receiver Output Voltage
OUT
13 R1 First Receiver Input Voltage
IN
14 T1 First Transmitter Output Voltage
OUT
15 GND Ground
16 V Supply Voltage
CC
+5V INPUT
+
C3
+
C5
16
1 Vcc 2
C1+ +10V
V+
+
+5V TO +10V
C1
VOLTAGE
3 C1-
DOUBLER
4
C2+
-10V
+ 6
+10V TO -10V
C2 V-
VOLTAGE
C2-
INVERTER
5 C4
+
14
11
T1 IN T1 OUT
T1
RS 232 OUTPUTS
7
10 T2 IN T2
OUT
T2
12 R1 R1 13
OUT IN
R1
5K
RS 232 INPUTS
R2 8
9 R2 IN
OUT
R2
5K
GND
15
NAME AND F UNCTION
52