Monma Board (Main Board) - Epson LQ-1050 Technical Manual

1.9.2 MONMA Board (Main Board)

Figure 1-17 shows the MONMA board, which contains a KPD78 10HG CPU to control the operation of
the printer.
Driver circuits for the motors, sensors, and printhead are also included on this board. Other main ICS
on the MONMA board are:
Universal IC
M546 10P (5A) . . . 8-bit parallel interface IC
STK6722H (1A) . . . Carriage motor driver IC
Gate Array IC
(1OC) . . .
EO5A1OAA
E05A09BA (2A) . . . Carriage and paper feed motors phase pulses control unit (MCU) IC
E05A02AA (3A) . . . Printhead data driver IC
Memory IC
MASK-ROM (6A) . . . Used for character generator, 1 M-bit
ST-RAM (7A) . . . 256 K-bit
ST-RAM (8A) . . . 64 K-bit
Memory management unit (M MU) IC
Fig. 1-17. MONMA Board
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