Ribbon Control Pcba Simplified Schematic - Printronix p300 Maintenance Manual

+5V
+36V
NSD
RH
END OF
RIBBON
DETECTORS
LH
P300/P600 Principles of Operation
+27V
+
+17.8V
K1
–
+3.7V
LATCH
Figure 2–38. Ribbon Control PCBA Simplified Schematic
M1
R F1
+5V
R IN1
Q1
R S1
R C
(LOW)
(HIGH)
+1V TO +5V
+
K2
M2
–
R F2
R IN2
Q2
+5V
R S2
(VOLTAGES ARE AS INDICATED
WHEN RIBBON IS RUNNING FROM
RIGHT TO LEFT)
2–57
+5V