Printronix P9012 Maintenance Manual page 51

+5V
+36V
NSD
RH
END OF
LATCH
RIBBON
DETECTORS
LH
Figure 2–24. Ribbon Control PCBA Simplified Schematic
Principles of Operation
Figure 2–23. Ribbon Deck
+27V
+
+17.8V
K1
M1
–
R F1
R IN1
Q1
+3.7V
R S1
(LOW)
(HIGH)
+1V TO +5V
K2
M2
R F2
+5V
R IN2
Q2
+5V
R C R S2
(VOLTAGES ARE AS INDICATED
WHEN RIBBON IS RUNNING FROM
RIGHT TO LEFT)
+ +5V
–
2–33