THEORY
Electrical
SERVICE MANUAL
2-18
8.3.
Keyboard Control Circuit
The keyboard control circuit is shown in Fig. 2.18.
The matrix pattern on the keyboard FPC controls port 7 (0:7) of CBIC (#8) according to
data signals KO0 through KO8. The LOW level signals are output to output lines KO0
through KO8. The electrode wiring is scanned line by line. The result of scanning is
input to P70 through P77 of CBIC (#8). CBIC (#8) detects which key has been pressed.
The key matrix given in Fig. 2.19 corresponds to the key arrangement shown in Fig.
2.20.
Fig. 2.18 Keyboard Control Circuit
Содержание DP-550CJ
Страница 15: ...THEORY SERVICE MANUAL Mechanical 1 3 Fig 1 2 General View of Printing Mechanism ...
Страница 20: ...THEORY Mechanical SERVICE MANUAL 1 8 Fig 1 7 Printer Flat Cable to Cartridge Alignment ...
Страница 21: ...THEORY SERVICE MANUAL Mechanical 1 9 Fig 1 8 Ink Jet Cartridge to Flat Cable Alignment ...
Страница 33: ...THEORY SERVICE MANUAL Mechanical 1 21 Fig 1 17 LCD Unit Installation in the Upper Cover ...
Страница 34: ...THEORY Mechanical SERVICE MANUAL 1 22 DP 525CJ LW 800ic Fig 1 18 LCD of DP 525CJ LW 800ic ...
Страница 36: ...THEORY Mechanical SERVICE MANUAL 1 24 DP 540CJ DP 550CJ LW 840ic Fig 1 20 LCD of DP 540CJ DP 550CJ LW 840ic ...
Страница 38: ...THEORY Electrical SERVICE MANUAL 2 2 Fig 2 1 Major Electronic Component Parts ...
Страница 80: ...REPAIR SERVICE MANUAL Troubleshooting 3 17 Fig 3 5 Results of Self Print Test ...
Страница 118: ...REPAIR SERVICE MANUAL Mechanical 4 3 Fig 4 2 Removing the Sub Paper Support and Paper Support ...
Страница 124: ...REPAIR SERVICE MANUAL Mechanical 4 9 Fig 4 6 Removing the LCD Unit ...
Страница 127: ...REPAIR Mechanical SERVICE MANUAL 4 12 DP 525CJ LW 800ic Fig 4 8 Removing the LCD PCB 1 ...
Страница 128: ...REPAIR SERVICE MANUAL Mechanical 4 13 DP 530CJ LW 810ic Fig 4 9 Removing the LCD PCB 2 ...
Страница 129: ...REPAIR Mechanical SERVICE MANUAL 4 14 LW 810icBL Fig 4 10 Removing the LCD PCB 3 ...
Страница 130: ...REPAIR SERVICE MANUAL Mechanical 4 15 DP 540CJ Fig 4 11 Removing the LCD PCB 4 ...
Страница 131: ...REPAIR Mechanical SERVICE MANUAL 4 16 DP 550CJ LW 840ic Fig 4 12 Removing the LCD PCB 5 ...
Страница 134: ...REPAIR SERVICE MANUAL Mechanical 4 19 Fig 4 14 Installing LCD Latch ...
Страница 139: ...REPAIR Mechanical SERVICE MANUAL 4 24 Fig 4 18 Installing the Hinge Assy ...
Страница 154: ...REPAIR SERVICE MANUAL Mechanical 4 39 Fig 4 30 Removing the Hopper Assembly ...
Страница 162: ...REPAIR SERVICE MANUAL Mechanical 4 47 Fig 4 38 Removing the Carriage ...
Страница 171: ...REPAIR Mechanical SERVICE MANUAL 4 56 Fig 4 45 Measuring Friction during Carriage Movement ...
Страница 178: ...REPAIR Mechanical SERVICE MANUAL 5 2 Fig 5 1 Carriage Assembly Lubrication Points ...
Страница 179: ...REPAIR SERVICE MANUAL Mechanical 5 3 Fig 5 2 Paper Feed Assembly Lubrication Points ...
Страница 180: ...REPAIR Mechanical SERVICE MANUAL 5 4 Fig 5 3 Eject Roller Assembly and PF Roller Assembly Lubrication Points ...
Страница 194: ...Feb 98 53T010BE1 R ...