III
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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
Содержание PT-2500PC
Страница 1: ...SERVICE MANUAL MODEL PT 2500PC ...
Страница 2: ...SERVICE MANUAL MODEL PT 2500PC ...
Страница 5: ...CHAPTER I SPECIFICATIONS ...
Страница 11: ...CHAPTER II MECHANISMS ...
Страница 49: ...CHAPTER III ELECTRONICS ...
Страница 68: ...CHAPTER IV TROUBLESHOOTING ...
Страница 72: ...IV 3 3 The ON OFF lamp LEDs will not come on 4 No printing is performed ...
Страница 73: ...IV 4 5 Interface malfunctions 6 No tape cutting ...
Страница 74: ...IV 5 7 Tape feeding error ...
Страница 75: ...IV 6 ...
Страница 76: ...APPENDICES Circuit Diagrams A Main PCB B Power Supply PCB ...
Страница 79: ...Nov 98 5V2086BE0 Printed in Japan ...