EPSON FX-890/2190
Revision B
Operating Principles
Overview
46
2.1.1.6 Ribbon Feed Mechanism
The CR motor drives the ribbon feed mechanism via the timing belt. The ribbon feed
mechanism has the sun and planetary gear system. No matter the carriage unit is driven
left and right, the ink ribbon is driven in one direction.
Figure 2-4. Printer Mechanism Outline
2.1.1.7 Sensors
Table below lists the sensors of this printer.
Rear PE Detector
Front PE detector
Platen Roller
Release Lever
PF Motor
HP Detector
Carriage Unit
Timing Belt
CR Motor
Printhead
CR Guide Shaft
Tractor
Release Detector
Ribbon Unit
PG Adjust
Lever
PG
Detector
Table 2-1. Sensors
Sensor
Outline
Refer to for
Disassembly/
Assembly
CR HP detection
Means
Mechanical contact
Switch rating
06~1.0 mA 5 VDC ± 5%
(Resistance load)
Switch mode
Within home (IN): CLOSE
Out of home (OUT): OPEN
PE detection
(Front)
Means
Mechanical contact
Switch rating
06~1.0 mA 5 VDC ± 5%
(Resistance load)
Switch mode
There is paper: OPEN
No paper: CLOSE
PE detection
(Rear)
Means
Photo interrupter
Switch rating
5 VDC ± 5%
(Resistance load)
Switch mode
There is paper: OPEN
No paper: CLOSE
Platen Gap
detection
Means
Mechanical contact
Switch rating
06~1.0 mA 5 VDC ± 5%
(Resistance load)
Switch mode
Normal mode (0~1): CLOSE
Copy mode (2~7): OPEN
Release Lever
detection
Means
Mechanical contact
Switch rating
06~1.0 mA 5 VDC ± 5%
(Resistance load)
Switch mode
Friction: OPEN
Tractor: CLOSE
Cover open
detection
Means
Mechanical contact
Switch rating
06~1.0 mA 5 VDC ± 5%
(Resistance load)
Switch mode
Case opened: OPEN
Case closed: CLOSE
Summary of Contents for 890N - FX B/W Dot-matrix Printer
Page 1: ...EPSONFX 890 2190 Serial Impact Dot Matrix Printer SEDM02003 SERVICE MANUAL ...
Page 8: ...C H A P T E R 1 PRODUCTDESCRIPTIONS ...
Page 43: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Page 52: ...C H A P T E R 3 TROUBLESHOOTING ...
Page 65: ...C H A P T E R 4 DISASSEMBLYANDASSEMBLY ...
Page 93: ...C H A P T E R 5 ADJUSTMENT ...
Page 98: ...C H A P T E R 6 MAINTENANCE ...
Page 104: ...C H A P T E R 7 APPENDIX ...
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Page 118: ...FOR FX 890 NO 4 R ev 01 C524_PACK_01 03 01 06 04 04 xx 07 02 02 02 05 05 ...
Page 120: ...FOR FX 2190 NO 2 Rev 01 C526_ELEC_01 A A B G D E J F F K L B I F H 200 400 373 330 372 450 ...