Logic Components; Cpu (M30622M8); Ram (Sram); Rom (Eeprom) - Brother PT-2500PC Service Manual

3.2.1

Logic Components

[ 1 ] CPU (M30622M8)

The CPU (#3) is a 16-bit microprocessor manufactured by Mitsubishi Electric Corp.,
which controls and manages the entire system.
This CPU integrates a 64-kilobyte ROM which stores all programs and a 4-kilobyte RAM.

[ 2 ] RAM (SRAM)

The RAM is a 32-kilobyte SRAM (#4) which is used as a data buffer.

[ 3 ] ROM (EEPROM)

The ROM is a 1-kilobit EEPROM (#1) which stores the transmission speed and
mechanical information.
3.2.2

Solder Points

Fig. 3.2-2 shows a circuit diagram relating to solder points. Solder points A to C are
soldered according to the resistance property of the thermal head.
The CPU reads the status of the solder points once in the powering-on sequence to
recognize the customization.
Fig. 3.2-2 Solder Points
III - 4