EPSON FX-890/2190
Revision B
Operating Principles
Overview
49
Figure 2-5. C524 MAIN Block Diagram
Energy save (ESA
VE) circuit
Driver element: DTC124X
Control:
Controlled by output port (P_CTRL) of ASIC
Register setting
0: 42 V power voltage rising (Power ON)
{At reset}
1: 42 V power voltage lowering
Simple ecodrive
circuit
90 V constant voltage circuit:(2 circuits each of which is
constituted with 9 pins)
Type:
Constant-voltage dropper circuit (for head
power regression)
Driver element:FET 2SK3155 (Hitachi)
Input eco voltage:88.7 V ~ 95.8 V
Output power v42 V
±
5% (Controlled to a constant
voltage by Power Supply Unit.)
Overvoltage detecting circuit (OVP): Detects 120 V or
above as a overvoltage.
Outputs Off signal to the Power Supply Unit.
Table 2-2. Major Elements on MAIN Board (continued)
Elements
Location
Function
Содержание 890N - FX B/W Dot-matrix Printer
Страница 1: ...EPSONFX 890 2190 Serial Impact Dot Matrix Printer SEDM02003 SERVICE MANUAL ...
Страница 8: ...C H A P T E R 1 PRODUCTDESCRIPTIONS ...
Страница 43: ...C H A P T E R 2 OPERATINGPRINCIPLES ...
Страница 52: ...C H A P T E R 3 TROUBLESHOOTING ...
Страница 65: ...C H A P T E R 4 DISASSEMBLYANDASSEMBLY ...
Страница 93: ...C H A P T E R 5 ADJUSTMENT ...
Страница 98: ...C H A P T E R 6 MAINTENANCE ...
Страница 104: ...C H A P T E R 7 APPENDIX ...
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Страница 116: ...FOR FX 890 NO 2 R ev 01 C524 E LE C 01 A A B J C B C H E F I K L M G D D 300 450 372 200 400 350 ...
Страница 118: ...FOR FX 890 NO 4 R ev 01 C524_PACK_01 03 01 06 04 04 xx 07 02 02 02 05 05 ...
Страница 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 ...