REV.-A
Second, there are four circuits to protect the supply circuitry and avoid danger. The
VDC line
contains a current overload protection circuit and a voltage overload protection circuit. The current
overload protection circuit is part of the
VDC supply circuit. It cuts the
VDC line if the current
is too great. The
V voltage overload protection circuit cuts the supply if the voltage reaches or
exceeds
VDC. It stops the switching circuit operation, which stops the output of the
VDC line.
The
VDC line has a voltage overload protection circuit and a voltage drop protection circuit. The
+ 35 V voltage overload protection circuit cuts the supply if the voltage reaches or exceeds 36 VDC.
It stops the switching circuit operation, which stops the output of the + 35 VDC line. The voltage drop
protection circuit protects the printer from such damage as might occur from short circuiting in the
secondary circuitry of the
VDC line. If a voltage drop is detected, it stops the switching circuit
operation, which stops the output of the
VDC line.
Power Supply Board
P r i m a r y
Secondary
I
I
,
I
Power
Switch
Figure 2-16. Power Supply Circuit Block Diagram
2-12
Summary of Contents for LG1-1070
Page 1: ...EPSON TERMINAL PRINTER LG1 570 lo7cJ L 4000566 REV B ...
Page 111: ...REV A Figure 6 2 LQ 570 Lubrication Points 6 3 ...
Page 112: ...REV B 6 4 ...
Page 125: ...REV B C3 11 C9 I 1 Figure A 10 BOARD ASSY POWER SUPPLY C062 PSB BOARD Component Layout A 1 3 ...
Page 127: ...REV B Zluo Zr Vlr alr Figure A 1 2 BOARD ASSY PANEL C062 PNL BOARD Component Layout A 1 5 ...
Page 128: ...Figure A 1 3 LQ 570 Exploded Diagram A 1 6 ...
Page 129: ...REV B A 1 9 ...
Page 133: ... I C 71 I Ila u 4 l t mm 151 m Figure A 1 8 LQ 107O Case Outline Drawing A 23 ...
Page 135: ...EPSON Printed in Japan 91 09 5 G ...
Page 137: ...LQ 570 1070 ActionPrinter 5000 5500 24 PIN DOT MATRIX PRINTERS TM LQ57AP5 ...
Page 138: ...L Q 5 7 0 1 0 7 0 SERVICE MANUAL EPSON Printed on Recycled Paper ...
Page 141: ......
Page 233: ...REV A No Replace printhead and PH cable Yes 5 Perform final t e s t 5 7 ...
Page 249: ...REV A Figure 6 2 LQ 570 Lubrication Points 6 3 ...
Page 250: ...REV B Figure 6 3 LQ 1 070 Lubrication Points 6 4 ...
Page 257: ... 5 3 R L ...
Page 261: ... I L N CNl L I r I 1 TT 1 C062 PSE Board 2002850 ...
Page 262: ...Pb CNl C062 PSE Board 2002850 ...
Page 263: ...CN1 RXSO PIUSE d I CO62 PNL Board 1 Excluding Japan ...
Page 267: ... C O 6 2 P N L QW CM YXT 2 DIP 5 1 s A S S Y 2 0 0 2 8 5 2 0 0 J3 DI I ...
Page 268: ... 2 ...
Page 269: ...REV B Figure A 14 LQ 1070 Exploded Diagram A 17 ...
Page 270: ...REV B x Figure A 15 Model 5E10 Exploded Diagram A 18 ...
Page 271: ...REV B Figure A 16 Model 5E60 Exploded Diagram A 19 ...
Page 274: ...REV A A 5 CASE OUTLINE DRAWING 3 6 8 m m Figure A 17 LQ 570 Case Outline Drawing A 22 ...
Page 275: ...REV B 151 I Figure A 18 LQ 1070 Case Outline Drawing A 23 ...
Page 306: ...Appendix B Figure B 16 Cl07 iMX lN Board Component Layout Epson LQ 570 1 070 B 29 ...