Epson LQ-2550 Technical Manual page 126

HF Motor Control/Drive Circuit
Figure 2-75
shows the HF motor control/drive circuit, and Figure 2-76 shows the HF motor control/drive '
circuit signal timing.
+5
5
CPU
SUB
[70)
15
HF MOTOR
ON/OFF
Thermistor in
HF motor
o u t p u t
H - - -
I n t e g r a t i o n
C i r c u i t
o u t p u t
L
Unstable ~
Oscillation
Circuit
output L
H
A
O F F
( 2 C : p i n 1 3 )
L
H
8
OFF
(2 C:pin 1 2)
L
[v]
Approx. 60
al 1
Collector
Voltage O
8 2 148(2c)
H D
[Acceleration
control)
Figure 2-75. HF Motor
- - - - - - - - - - - - - - - -
- - - - - - - - - - - -
,
,
OFF
O N
1
OFF
1
Figure 2-76. Motor Control/Drive Circuit Signal Timing
6
PHASE PuLSE
UNSTABLE
[2-phase)
[timer)
+35
SURGE VOLTAGE
Control/Drive Circuit
ON
OFF
ON
1
2 - 8 0
+35 CN9
COIL DRIVER
TR.
' 012
I
I
1 ,
' 011
Y
1 ,
1
,
1 - - - - - - - - -
.: . , . ,
--
R
.