Oki C5550, Maintenance Manual, Page: 42 / 313

Oki Data CONFIDENTIAL
44158801TH Rev.2
42 /
2.3.2.4 Panel and LCD Module Circuit
The circuit for Panel and LCD module controls the function of the entire module including the
LCD Display, the push button on the Control Panel, and LED display.
Pin assignment of LCD module
Pin No Name Function
1 D.G. Digital Ground
2 KPDATA0 Data Bus bit 0
3 KPDATA1 Data Bus bit 1
4 D.G Digital Ground
5 KPDATA2 Data Bus bit 2
6 KPDATA3 Data Bus bit 3
7 D.G. Digital Ground
8 KPDATA4 Data Bus bit 4
9 KPDATA5 Data Bus bit 5
10 D.G. Digital Ground
11 KPDATA6 Data Bus bit 6
12 KPDATA7 Data Bus bit 7
13 D.G. Digital Ground
14 VCC Digital Power Supply
15 VCC Digital Power Supply
16 VCC Digital Power Supply
17 VCC Digital Power Supply
18 D.G. Digital Ground
19 D.G. Digital Ground
20 LCDRS LCD Register Selection
21 LED3 Led Chip Select 3
22 LCDRW LCD Read/Write Selection
23 nLED4E LED Chip Select 4
24 nBRD Scan Key Read Chip Select
25 nBWR Scan key Write Chip Select
26 LCDE LCD Enable Signal
27 nLED0 LED Chip Select 0
28 nLED1 LED Chip Select 1
29 nLED2 LED Chip Select 2
30 D.G. Digital Ground
31 - 8V NC
32 RST5V# LCD Reset Signal