III
- 10
3.2.7 Thermal Head Control Circuit
Fig. 3.2-7 shows the thermal head control circuit. The print head integrates a heat
generator (consisting of 128 heating elements vertically aligned in 180 dpi) and a pair of
built-in driver ICs which are designed for 64-element control.
Synchronizing with the clock on P61, the CPU outputs serial print data containing 128-
dot frame (8 x 16 bit map) through P63 to the drivers.
If the CPU runs out of control, this circuit cuts off the strobe signal (P80) to the thermal
head after the specified time length by the CR time constant of C17
•
R46.
Fig. 3.2-8 shows the head drive timing scheme.
Fig. 3.2-7 Thermal Head Control Circuit
Fig. 3.2-8 Head Drive Timing Scheme
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 ...