Power Supply Circuit Operation; Monps/Monpse Boards - Epson LQ-1050 Technical Manual

REV.-A
2.2 POWER SUPPLY CIRCUIT OPERATION (MONPS/MONPSE
board)
The DC voltages required to operate the mechanisms and control circuits are supplied from the supply
board in this unit. There are two kinds of power supply boards, the MONPS board for 100 V or 120
V operation and the MONPSE board for 220 V or 240 V operation. Refer to Table 2-7.
Since the MONPS board has almost the same structure as the MONPSE board, this section will describe
the MONPS board.
Name

2.2.1 MONPS/MONPSE Boards

The MONPS and MONPSE boards generate the DC voltages shown in Table 2-8 to supply the circuits
and operate the mechanisms.
* Refer to Figure A-34 and Figure A-35 in the Appendix for the entire circuit of the MONPS and MONPSE
boards.
Power Voltage (DC)
V x (+5V) - GND
NOTE: The voltage Vx is generated on the MONMA board. Refer to Section 2.3.1.1.
Table 2-7. Power Supply Voltages
Input AC
100 or 120
220 or 240
Table 2-8. Voltages and Applications
I
(1) Carriage motor drive
(2) Paper feed motor drive
(3) Printhead solenoid drive
(4) Plunger drive
(5) Fan motor drive
(1) MONMA board logic circuit power
(2) Power for various sensors
(3) Indicator lamps on the control panel power
(4) Optional interface board power
(5) Paper feed motor holding
(6) Plunger holding
(7) Optional cartridge power
Reset
(1) circuit
(2) pull-up H 1 to H24 of IC 3A
2-10
Rated Fuse F1
125V, 3. 15A
250V, T2A
Application