DEC VT420 Service Manual page 73

6 DSR2
J2 DEC-423 Comm2/Printer Port Connector
Pin 1 HPTRDTR
2 HPTRTXD
3 GND
4 PTRCOM
5 PTRRXD
6 PTRDSR
J3 Keyboard Port Connector
1 HKBTXD
2 GND
3 +12 V
4 KBRXD
CRT/Yoke/Bezel Assembly
J601 CRT Yoke Connector
Pin 1 No connection
2 No connection
3 Vertical yoke
4 Vertical yoke
5 Horizontal yoke
6 Horizontal yoke
Arc Protection Board Assembly
J701 CRT Socket Connector
Pin 1 GRN G1
2 YEL K2
3 BRN H1
4 P701 (H2)
5 Not used
6 RED G2
7 BLU G4
Physical/Functional Diagrams 65
Data set ready
Data terminal ready
Transmitted data
Transmit ground
Receive ground
Received data
Data set ready
Transmitted data
Ground
Received data
Grid 1 (green)
Cathode (yellow)
Heater –12 V (brown)
Heater ground (black)
Grid 2 (red)
Grid 4 (blue)