Epson Stylus Photo 750 Service Manual page 41

EPSON Stylus Photo 750
† Driver on the head
The driver on the head is Nozzle-selector drive circuit. Each drive
waveform generated in the drive voltage wave form circuit is
charged to the selected nozzle by this circuit with PZT elements,
then, printing is performed.
Operating Principles
2.2.2.7 Paper Feed (Pump) Motor (PF/Pump Motor) Drive
Circuit
IC12 and IC13 on the control circuit board drive PF/PUMP motor. This
motor uses 4-phase 200-pole Hybrid type stepping motor and drives
constant current bi-pola.
C90A05
Operating Principles of Electric Circuit
8
PFIA0
9
PFIA1
10
PFIA2
11
PFPHAA
4
PFIB0
5
PFIB1
6
PFIB2
+5
7
PFPHAB
E05B58**(IC2)
(IC1)
6
-
7
112
5
+
DA1
Current
Detection
M6252(IC16)
Rotor
Figure 2-9. Paper Feed (Pump) Motor Drive Circuit
Revision A
A3956(IC12)
10
14
D0
OUTA
9
15
D1 OUTB
8
D2 VBB
7
PHASE VCC
2
REF
1
PFD
A3956(IC13)
10
14
D0 OUTA
9
15
D1 OUTB
8
D2 VBB
7
PHASE
VCC
2
REF
1
PFD
CN8
1
A
3
/A
2
B
4
/B
36