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
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