1
1
2.3.5 Paper Advance Motor Drive Circuit
The printer uses a stepping motor to advance the paper. The minimum amount the printer can advance
paper is
inch. The motor is a 2-2 or 1-2 phase, constant-voltage drive motor.
to P73 in the
CPU
are
the control ports for the stepping motor. Paper advance motor phase data is output through
these ports. PFB to PFD are turned on and off in the PU 150 1 according to the phase data the CPU sends.
When the paper advance motor is running, the voltage supplying the coil of the paper advance motor
is i-35 V. When the paper advance motor is not running and is in hold status, the supply voltage to
the coil is
V. Switching between these two supply voltages occurs at the PFCOM terminal of the
PU 150 1 when /PFENB is turned on or off.
C P U
P72
P71
P73
S T K - 6 0 2 2 B ( 2 A )
C l
C2
c 3
PF-BIN
C4
PFA
PF MOTOR
P F - A
PFB
P F - B
PFCOM
B
P
( 4 B )
Figure 2-23.
Paper Advance Motor Drive Circuit
2-20
Summary of Contents for LQ-1170
Page 1: ...LQ 1170 24 PIN DOT MATRIX PRINTERS TM LQ8 1170 ...
Page 2: ...L Q 8 7 0 1 1 7 0 SERVICE MANUAL EPSON T Printed on recycled paper ...
Page 101: ...10 9 91 Yes NO Replace pluggable chips on main board 5 6 ...
Page 110: ...Table 5 4 Repair of the Power Supply Board Continued 5 15 ...
Page 118: ......
Page 121: ...REV A Figure 6 2 LQ 870 Lubrication Points 6 3 ...
Page 122: ...REV A Figure 6 3 LQ 1170 Lubrication Points 6 4 ...
Page 134: ...1 I II ...
Page 135: ...REV A Q m u D w IL 0 1 xl Figure A 3 CO60 DRV Board Circuit Diagram A 11 ...
Page 136: ...Figure A 4 CO60 PSB Board Circuit Diagram A 12 ...
Page 138: ...LO SLOE002 OWO9 1Nd 0 9 0 3 5 f l P I 11 I 01 I 6 I 8 1 L 9 I 9 I B I I2 I 2 I 1 ...
Page 142: ...REV A Fl 24ov T3 IsA I I II II AL I CU rl Figure A 10 C060 PSE Board Component Layout A 1 8 ...
Page 143: ...LMS d10 IP IMS dla ...
Page 144: ...REV A A 4 EXPLODED DIAGRAM Figure A l 2 1 Exploded Diagram for LQ 870 A 2 0 ...
Page 145: ......
Page 146: ...REV A Figure A 13 1 Exploded Diagram for Model 5DlO A 22 ...
Page 147: ... 5 2 5 610 c 3 5 9 0 El ...
Page 149: ...REV A A 5 CASE OUTLINE DRAWING Figure A l 4 1 Case Outline Drawing for LQ 870 A 25 ...
Page 151: ...lllllll IllI l l IIIIII II0 IIll III1 I I I C O 6 1 M A I N B o a r d A 3 7 ...
Page 152: ... U nRonenl2 i i C O 6 0 HAIN B t _1 m r OL J IIA IS I 19 CNI 36 I I8 I 23 IS ...
Page 153: ...a i iJ 0 E fig tfti I z ...