Confirming I/O Board Operation; Confirming The Developing Bias Voltage Control Circuit - Printronix L5000 Series Maintenance Manual

Confirming I/O Board Operation

Confirming the Developing Bias Voltage Control Circuit

1. Using the engine checker, drive the developing bias. The menu path is BASIC
MENU, DEVICE CHECK, OUTPUT SIGNAL, H.V.P.S., DEV. BIAS, START.
2. Put the positive lead of the digital multi–meter on TP25 on the I/O board, and the
negative lead on the DG.
3. Use the engine checker to set the device check mode for the rotary switch. The
menu path is BASIC MENU, DEVICE CHECK, INPUT SIGNAL, SWITCH,
ROTARY SWITCH.
4. The multi–meter should display the following voltage readings when you change
the values of the rotary switch on the MPU board (SW1). If the voltages are not
normal, replace the I/O board.
Board Adjustments
SW1 Voltage
0
1 0.73 0.06V
2 1.45 0.11V
3 2.18 0.17V
4 2.91 0.23V
5 3.64 0.28V
6 4.36 0.34V
7 5.09 0.40V
8 5.82 0.45V
9 6.55 0.51V
A 7.27 0.57V
B 8.00 0.63V
C 8.73 0.68V
D 9.45 0.74V
E 10.18 0.80V
F 10.91 0.85V
9–19