Sharp ER-A450, Service Manual, Page: 19 / 68

Pin
No.
Signal
name
In/Out Function
33 D5 I/O Data bus 5: Internal register, print buffer
data IO
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
Pin
No.
Signal
name
In/Out Function
82 EBACK O Bus acknolege to option
83 RPE I Receipt paper empty
84 JPE I Journal paper empty
85 PHUP I Printer head up
86 PCRES I Auto cutter unit reset signal input (Nu)
87 PFP I Auto cutter unit FP signal input (Nu)
88 RVPON O Receipt side paper feed pulse motor
common power control signal (Nu)
89 GND — GND
90 GND — GND
91 GND — GND
92
JVPON O Journal side paper feed pulse motor
common power control signal (Nu)
93 VHCOM O Head drive common power control
94 CTBO O Cutter motor control signal (Nu)
95 CTAO O Cutter motor control signal (Nu)
96 RDS O Receipt side paper feed pulse motor
drive signal, phase D
97 RCS O Receipt side paper feed pulse motor
drive signal, phase C
98 GND — +5V
99 Vcc — +5V
100 Vcc — +5V
101 Vcc — +5V
102 Vcc — +5V
103 Vcc — +5V
104 RBS O Receipt side paper feed pulse motor
drive signal, phase B
105 RAS O Receipt side paper feed pulse motor
drive signal, phase A
106 JDS O Journal side paper feed pulse motor
drive signal, phase D
107 JCS O Journal side paper feed pulse motor
drive signal, phase C
108 JBS O Journal side paper feed pulse motor
drive signal, phase B
109 JAS O Journal side paper feed pulse motor
drive signal, phase A
110 GND — GND
111 GND — GND
112 GND — GND
113 CGS O NU
114 BWR O PB-RAM write strobe signal
115 BRD O PB-RAM read strobe signal
116 BA15 O NU
117 BA14 O Address 14 for PB-RAM
118 BA13 O Address 13 for PB-RAM
119 PTRM I Receipt motor connector sens signal
120 PTJM I Journal motor connector sens signal
121 GND — GND
122 GND — GND
123 POPI O GND
124 BA12 O Address bus 12 for PB-RAM
125 BA11 O Address bus 11 for PB-RAM
126 BA10 O Address bus 10 for PB-RAM
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