Main Conponents; Main Control Board(C160 Main Control Board); Figure 1-8. C160 Main Control Board Component Layout - Epson Stylus 820 Service Manual

Stylus Color IIs / Stylus 820
1.5 MAIN COMPONENTS
The main components of the Stylus Color IIs are:
Printer mechanism (M-4C10)
Main control board (C160 MAIN Board)
Power supply unit (C160 PSB/PSE Board)
Control panel board (C160 I/F Board)
Housing
1.5.1 Main Control Board (C160 MAIN Board)
The main control board (C160 MAIN Board) consists of an M37720 16-bit CPU, E05B08 gate array, a
program ROM (4M), a PS-RAM (1M), a mask ROM (4M or 8M: If a 4M-bit program ROM is mounted on
the board, an 8M-bit CG-ROM is mounted in location IC5, and if an 8M-bit program ROM is mounted on
the board, there is no CG-ROM in location IC5.) and a 1K EEPROM. The reset IC (M51955 and PST 592)
is equipped with both a logic system and a power system.
Note:
During servicing, when you replace the program ROM, always install an 8M-bit program ROM
regardless of the components mounted on that particular board. When you do this, the
CG-ROM in location IC5 is ignored.
CN1
CN2
4M or 8M Bit PROM (IC3)

Figure 1-8. C160 Main Control Board Component Layout

Rev. A
CPU M3772051 (IC2)
E05B08 (IC1)
8M Bit CG-ROM (IC5)
1M Bit PSRAM (IC4)
Product Description
CN4
CN3
SW3 SW2
CN7
CN8
CN5
CN6
SW1
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