PRINCIPLES OF OPERATION
REV.-A
EA1 and EA2 in the IC are error amplifiers. EA2 is used to detect the output voltage. Figure 2-27 illustrates
the setting of the output voltage. The rated voltage of Zener diode ZD23 is 5 V. Accordingly, 5 V is input
at the negative terminal of EA2.
The error amplifier works to bring the voltages at the positive and negative terminals into conformance. Voltage
is output, when necessary, to bring the voltage at the positive terminal to 5 V.
Figure 2-28 shows the EA2 output conditions. If the voltage of pin 16 becomes higher than that of pin 15
(i.e., if over-voltage occurs), EA2 begins output. PWM is activated on the basis of the output level, and the
circuit’s output voltage is lowered. (Further details are provided subsequently.)
2 0 µ s / D I V
Figure 2-26. Oscillator Waveforms
output
Voltage
Figure 2-27. Constant Voltage Control
Under Voltage
Over Voltage
EA2
o u t p u t
(NORMAL Voltage)
Figure 2-28. EA1 Output
2-22
LQ-510
Summary of Contents for AP-4000
Page 1: ...LQ 510 AP 4000 T E C H N I C A L M A N U A L EPSON ...
Page 4: ...REV A REVISION SHEET iv LQ 510 ...
Page 103: ...REV A PRINCIPLES OF OPERATION LQ 510 Figure 2 68 A D Converter Circuit 2 61 ...
Page 125: ...OPTIONAL EQUIPMENT REV A 3 16 Figure 3 12 Lubrication Points 2 LQ 510 ...
Page 167: ......
Page 192: ...MAINTENANCE REV A L __ w w n Figure 6 3 LQ 510 Lubrication Points 6 3 LQ 510 ...
Page 202: ...APPENDIX REV A Table A 6 E01A05 Pin Functions A 8 LQ 510 ...
Page 212: ...3 L CN 1 ...
Page 213: ...REV A APPENDIX Figure A 25 SANPSE Board Component Layout LQ 510 A 19 ...
Page 214: ...REV A APPENDIX J Figure A 26 SANPSE Board Circuit Diagram A 20 LQ 510 ...
Page 215: ...REV A APPENDIX Figure A 27 SANPNL W Board Circuit Diagram LQ 510 A 21 ...
Page 216: ... w 3 0 4 CN1 14 18 22 I IP I9 3 1 2LSl39 2 6 8 2 4 9 TOM4 BOARD Y 4 5 4 2 0 9 0 0 0 0 0 ...
Page 220: ...h i ...
Page 221: ...REV A APPENDIX 506 Figure 14 32 Model 5710 Printer Mechanism Exploded Diagram A 29 ...
Page 222: ...APPENDIX REV A Figure A 33 C80006 Pull Tractor Exploded Diagram A 30 LQ 510 ...
Page 223: ... Y ...
Page 224: ...APPENDIX REV Figure A 35 LQ 510 Printer Cover A Case Outline Drawing A 32 LQ 510 ...
Page 225: ...APPENDIX REV A J 2 7 J Bl Figure A 36 LQ 510 Printer Cover B Case Outline Drawing LQ 510 A 33 ...
