Printronix L5000 Series Maintenance Manual page 272

Alarm circuit
Because the alarm signal from the high–voltage power supply unit is open collector
output, it is pulled up to +5V by 4.7 KΩ resistor.
Signal pin assignments
The interface signals are assigned to the I/O board connecter (CN23) and interface
connecter pins. (However, pin 13 on I/O board CN23 has no connection.)
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
6–34
Signal
PG
SG
+24V
+HV1 REM
+HV1 CONT
–HV REM
+HV2 REM
–V REM
DRL REM
DRL CONT
HV3 REM
HV–UN ALM
GND (Frame ground)
Electrical and Wire Data