Service manual

Principles of Operation
Printhead specifications
Solenoids
24 solenoids
Wire Diameter
0.008 inch (0.20 mm)
Pin Arrangement
12 x 2, staggered
Drive Voltage 24 VDC f 10%
Coil Resistance
19.1 k 1.0 ohms at 77O F (25O C)
Printhead drive circuit block diagram
Gate array E05A02 is used as an 8-bit x 3 data latch. By monitoring the
printhead drive power (+24 V line), the CPU determines the pulse width for the
head wire drive pulses from gate array E05A02. The CPU also monitors the
printhead’s temperature and suspends printing.if the printhead overheats.
Figure 2-46. Printhead Drive Circuit Block Diagram
2-48
LQ-200/AP3000