Sharp XE-A203 Service Manual - Page 12

7-1. PRINTER HEAD TEMPERATURE MONITOR The voltage divided by the thermistor for detecting the printer head temperature and the resistor is inputted to the AN0 pin. Head A/D conversion temperature value (DEC) Operation Less than -10°C 929~1023 Motor lock -10°C ~ Less than 0°C 869~928 Print in the conduction time at 0°C. 0°C ~ Less than 70°C 232~868 Print in the conduction time specified on the MT-T53II specifications. 70°C or above 0~231 Motor lock 7-2. PRINTER HEAD VOLTAGE MONITOR The voltage supplied by the printer head power and passed through the printer and divided by the resistor is inputted to the AN1 pin. The printable voltage range for the printer is 140~252 in A/D conversion value. 7-3. BATTERY VOLTAGE MONITOR The voltage of VDD is inputted to AN3 pin. For an A/D value of 189 (3.69V) or less, it is judged as LOW BATTERY. For 174 (3.40V) or less, it is judged as NO BATTERY. 8. KEY/DISPLAY 8-3. CPU PORT AND REGISTER Function Address R/W LED Segment Signal 30000h W Address Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 30000h dp g f e d c b a PIN No. PORT 80 P10 79 P11 78 P12 77 P13 Use signal Function KST0 Key strobe signal 0 KST1 Key strobe signal 1 KST2 Key strobe signal 2 KST3 Key strobe signal 3 Strobe signals of /S0~/S9 are made by using SN74HC138 from KST0~KST3 signals. ST0 ST1 ST2 ST3 ST4 ST5 ST6 ST7 ST8 ST9 MODE P90 SRV PGM Time REG MGR X1/ X2/ Z1 Z2 P91 PF HEAD Out of UP paper The front display is of 10 digits of LED, and the POPUP display is of 7 digits of LED. FRONT: POP UP: /CS0 30000h CPU D0㨪D7 HC374 KS0㨪 HC138 KS3 a㨪g, dp ST0#㨪 ST9# Front Display 10 segment POPUP Display 㧣 segment ST0#㨪 ST9# P90㨪P97 Keyboard / MODE SW MATRIX 8-1. LED DIGIT SIGNAL The above /S0~/S9 are considered as LED DIGIT signals. S0#: First digit~S9#: 10th digit (For the POPUP side, ST0~ST6 are used.) 9. POWER TRANS. After occurrence of POFF#, the power interruption must be made within 10ms. PQ1CG203 VO 24V (DRAWER) POFF# detect point PQ1CG203 LM2574 + Tr. VLED 5.7V VCC 5.0V BA033 VCC 3.3V VDD 5.0V Battery ON/OFF Control (MODE SW) VP 8V PRINTER headMotor ON/OFF Control (MODE SWPOFF# VPON) 10. DRAWER 8-2. LED SEGMENT SIGNAL By writing the segment data to 30000h, the LED segment signal can be outputted. Data~Segment correspondence D0~D6 3 a~g D7 3 DP The XE-A203U/A203A is provided with 1CH of a drawer port. PIN No. 38 PORT P60 Use signal Function DR1 Drawer drive signal * The drawer solenoid drive time is as follow: 55ms (max) 50ms (min) XE-A203U/XE-A203A HARDWARE DESCRIPTION - 10 -