Confirming The Main Charger Current Control Circuit - Printronix L5000 Series Maintenance Manual

Confirming the Main Charger Current Control Circuit

1. Using the engine checker, drive the main charger. The menu path is BASIC
MENU, DEVICE CHECK, OUTPUT SIGNAL, H.V.P.S., MAIN CHGR,
START.
2. Put the positive lead of the digital multi–meter on TP26 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.
9–20
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
Board Adjustments