Digital Equipment LA30 N, Руководство по обслуживанию

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4.10 Diagnostics .............................................................................................................................................. 4-48
4.10.1 Self-test printing ................................................................................................................................ 4-48
(1) Starting self-test printing ............................................................................................................ 4-48
(2) Checking printer performance ................................................................................................... 4-49
(3) Stopping self-test printing .......................................................................................................... 4-49
4.10.2 Hex dump .......................................................................................................................................... 4-50
(1) Starting hex dump printing ........................................................................................................ 4-50
(2) Stopping hex dump printing ....................................................................................................... 4-50
4.10.3 Control panel maintenance functions initiated when power goes on ................................................ 4-51
CHAPTER 5 PRINCIPLES OF OPERATION .......................................................................................... 5-1
5.1 Overview ................................................................................................................................................... 5-1
5.2 Mechanical Operation ............................................................................................................................... 5-2
5.2.1 Print head drive ................................................................................................................................... 5-2
5.2.2 Carriage drive ...................................................................................................................................... 5-3
5.2.3 Ribbon feed ......................................................................................................................................... 5-4
5.2.4 Paper feed ............................................................................................................................................ 5-5
(1) Continuous forms feeding .......................................................................................................... 5-6
(2) Cut-sheet feeding ....................................................................................................................... 5-8
(3) Paper selection ........................................................................................................................... 5-9
(4) Autoloading ................................................................................................................................ 5-10
(5) Paper end detection .................................................................................................................... 5-11
5.2.5 Print head gap control (paper thickness adjustment) .......................................................................... 5-14
5.2.6 Color ribbon shift motor (option) ........................................................................................................ 5-15
5.2.7 Option detection mechanism ............................................................................................................... 5-16
5.3 Electrical Operation ................................................................................................................................... 5-17
5.3.1 System configuration .......................................................................................................................... 5-17
(1) Printer control board (ROM board) ............................................................................................ 5-19
(2) Power supply unit ...................................................................................................................... 5-19
(3) Sensors ....................................................................................................................................... 5-19
(4) Control panel .............................................................................................................................. 5-19
5.3.2 Main controller .................................................................................................................................... 5-23
5.3.3 Interface control .................................................................................................................................. 5-25
(1) Centronics parallel interface ...................................................................................................... 5-25
(2) RS-423 serial interface ............................................................................................................... 5-26
5.3.4 Carriage motor control ........................................................................................................................ 5-27
5.3.5 Print head control ................................................................................................................................ 5-31
5.3.6 Paper feed control ............................................................................................................................... 5-33