Epson 890N Service Manual - Page 49

C524 MAIN Block Diagram, Table 2-2., Major Elements on MAIN Board, continued, Elements - drivers

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EPSON FX-890/2190 Table 2-2. Major Elements on MAIN Board (continued) Elements Location Function 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 voltage:+42 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. Revision B Operating Principles Overview Figure 2-5. C524 MAIN Block Diagram 49

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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 voltage:+42 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