Sharp ER-A450T Service Manual - Page 20

Pin No. Signal name In/Out Function 34 D6 I/O Data bus 6: Internal register, print buffer data IO 35 D7 I/O Data bus 7: Internal register, print buffer data IO 36 A0 I Address bus 0 37 A1 I Address bus 1 38 A2 I Address bus 2 39 TPRCRQ2 - Request signal 40 INTI I +5V 41 WI I +5V 42 BACK I BACK 43 A3 I Address bus 3 44 A4 I Address bus 4 45 A5 I Address bus 5 46 A6 I Address bus 6 47 A7 I Address bus 7 48 A8 I Address bus 8 49 A9 I Address bus 9 50 GND - GND 51 GND - GND 52 GND - GND 53 A10 I Address bus 10 54 A11 I Address bus 11 55 A12 I Address bus 12 56 A13 I Address bus 13 57 A14 I Address bus 14 58 A15 I Address bus 15 59 A16 I Address bus 16 60 Vcc - +5V 61 Vcc - +5V 62 Vcc - +5V 63 A17 I Address bus 17 64 A18 I Address bus 18 65 A19 I Address bus 19 66 A20 I Address bus 20 67 A21 I Address bus 21 68 A22 I Address bus 22 69 A23 I Address bus 23 70 GND - GND 71 GND - GND 72 RD I Read strobe signal: Gate enable of data bus D0 - D7 tri-state buffer 73 WR I Write strobe signal: Write enable into the internal register and the print buffer. 74 AS I AS 75 POF I Power off signal 76 INT O Interrupt signal 77 WO O Wait request signal to the CPU 78 INH I Head drive inhibit 79 BREQ O Bus request to CPU 80 - - NU 81 EBREQ I Bus request from option 82 EBACK O Bus acknowledge to option 83 RPE I Receipt paper empty Pin Signal No. name 84 JPE 85 PHUP 86 PCRES 87 PFP 88 RVPON 89 GND 90 GND 91 GND 92 JVPON 93 VHCOM 94 CTBO 95 CTAO 96 RDS 97 RCS 98 GND 99 Vcc 100 Vcc 101 Vcc 102 Vcc 103 Vcc 104 RBS 105 RAS 106 JDS 107 JCS 108 JBS 109 JAS 110 GND 111 GND 112 GND 113 CGS 114 BWR 115 BRD 116 BA15 117 BA14 118 BA13 119 PTRM 120 PTJM 121 GND 122 GND 123 POPI 124 BA12 125 BA11 126 BA10 127 BA9 128 BA8 129 BA7 In/Out Function I Journal paper empty I Printer head up I Auto cutter unit reset signal input (Nu) I Auto cutter unit FP signal input (Nu) O Receipt side paper feed pulse motor common power control signal (Nu) - GND - GND - GND O Journal side paper feed pulse motor common power control signal (Nu) O Head drive common power control O Cutter motor control signal (Nu) O Cutter motor control signal (Nu) O Receipt side paper feed pulse motor drive signal, phase D O Receipt side paper feed pulse motor drive signal, phase C - +5V - +5V - +5V - +5V - +5V - +5V O Receipt side paper feed pulse motor drive signal, phase B O Receipt side paper feed pulse motor drive signal, phase A O Journal side paper feed pulse motor drive signal, phase D O Journal side paper feed pulse motor drive signal, phase C O Journal side paper feed pulse motor drive signal, phase B O Journal side paper feed pulse motor drive signal, phase A - GND - GND - GND O NU O PB-RAM write strobe signal O PB-RAM read strobe signal O NU O Address 14 for PB-RAM O Address 13 for PB-RAM I Receipt motor connector sensor signal I Journal motor connector sensor signal - GND - GND O GND O Address bus 12 for PB-RAM O Address bus 11 for PB-RAM O Address bus 10 for PB-RAM O Address bus 9 for PB-RAM O Address bus 8 for PB-RAM O Address bus 7 for PB-RAM 4 - 12