Casio PCR-255 Service Manual page 9

Pin No. Signal In/Out
41 P32/TO2 In
42 P31/TO1 In
43 P30/TO0 In
44 P03/INTP3/CI0 In
45 P02/INTP2 In
46 P01/INTP1 In
47 P00/INTP0/TI0 In
48 IC -
49 P72 In
50 P71 In
51 P70 In
52 VDD -
53 P127/FIP33 In
54 P126/FIP32 In
55 P125/FIP31 In
56 P124/FIP30 In
57 P123/FIP29 In
58 P122/FIP28 In
59 P121/FIP27 In
60 P120/FIP26 In
61 P117/FIP25 Out
62 P116/FIP24 Out
63 P115/FIP23 Out
64 P114/FIP22 Out
65 P113/FIP21 Out
66 P112/FIP20 Out
67 P111/FIP19 Out
68 P110/FIP18 Out
69 P107/FIP17 Out
70 P106/FIP16 Out
71 VLOAD -
72 P105/FIP15 Out
73 P104/FIP14 Out
74 P103/FIP13 Out
75 P102/FIP12 Out
76 P101/FIP11 Out
77 P100/FIP10 Out
78 P97/FIP9 Out
79 P96/FIP8 Out
80 P95/FIP7 Out
Note : Above data is measured under following condition.
Mode SW REG : AC cord plug in the AC outlet, Memory protection batteries in,
Mode SW OFF :
AC cord plug off : AC cord plug out the AC outlet, memory protection batteries in,
Mode SW Mode SW AC cord
REG OFF Plug off
H L L
L L L
L L L
H L L
H Pulse L
L L H
H L L
GND GND GND
H H H
- - -
L H H
+5V +5V +5V
L L L
L L L
L L L
L L L
L L L
L L L
L L L
L L L
L L L
L L L
L L L
Pulse L L
Pulse L L
Pulse L L
Pulse L L
H H H
Pulse -24V L
Pulse -24V L
-24V -24V L
Pulse -24V L
Pulse -24V L
Pulse -24V L
Pulse -24V L
Pulse -24V L
Pulse -24V L
H Pulse L
Pulse -24V L
Pulse -24V L
Mode SW position : REG
AC cord plug in the AC outlet, Memory protection batteries in,
Mode SW position : OFF
Mode SW position : OFF
— 7 —
Description
Mode switch position (REG)
Mode switch position (RF)
Mode switch position (PRG)
Reset pulse RP from printer
Sub timimg pulse Pt from printer
Power down signal PWD
Main timing pulse PT from printer
GND
TAX PAD signal for Japan
PAD2 condition
PAD1 condition
Power (+5V)
Key input signal KI7
Key input signal KI6
Key input signal KI5
Key input signal KI4
Key input signal KI3
Key input signal KI2
Key input signal KI1
Key input signal KI0
Winder motor drive signal WMO
Printer moter drive signal PMO
Head drive signal for printer PHD
Key common signal KC3
Key common signal KC2
Key common signal KC1
Key common signal KC0
Not used (+5V)
Display segment signal Sdp (Decimal point)
Display segment signal Sg
Display voltage VN
Display segment signal Sf
Display segment signal Se
Display segment signal Sd
Display segment signal Sc
Display segment signal Sb
Display segment signal Sa
Mode switch common signal
Display digit signal DG9
Display digit signal DG8