Printhead Solenoid Drive Circuit - Epson LQ-1050 Technical Manual

REV.-A
x
I
N
x
0
I
Fig. 2-78. Relationship
2.3.10.3 Printhead
The clock in the CPU changes the head trigger pulse width (HPW) as the +35 V line varies, to stabilize
the power delivered to the printhead solenoid. Figure 2-79 shows the collector waveform for the
I
Head Adjustment
Lever Position
I
2
I
4
Fig. 2-79. Relationship Between Printhead Drive Pulse Width and Collector Voltage at HD n.
35
Power Supply Limits
35 v t 10
"/0
C o i l Vo I toge ( +35V DC Line ; Y 2 )
D r i v e
Between Printhead Coil Drive Pulse Width and Drive Voltage
Solenoid Drive Circuit
Print Mode
I
Draft
Draft
Mode (Heed GoP
Mode (
38.5 [v 1
x l
emperature
X, [ins]
["c]
25
0.745
25 1.145
2-74
Lever Position: I-3 )
x 2
I I
X
[ins] Y, [v]
2
0.200 76
0.220
74
4 - 8 )
I I
36
I
34