Service manual

CONTENTS
Title
Page
SPECIFICATIONS
SET
UP AND TESTING
RIBBON CARTRIDGE
.................................................................................... 2
PAPER INSTALLATION ................................................................................. 3
SELF TEST ................................................................................................. 4
ACCESSORIES PARTS LIST
............ ............................................. ..................... ...... 5
MAINTENANCE
................ ............. .................... ........................ .............. ....... ....... 5
FUNCTIONAL BLOCK DIAGRAM
......................... ................................. ..... .......... .... 6
CIRCUIT THEORY
POWER SUPPLY .......................................................................................... 7
RESET LOGIC .. .......................... ...................................... ............................ 8
CLOCK CIRCUIT
........................ ...................................... ............................ 9
MICROPROCESSOR LOGIC
............................................... ............................ 10
PAPER FEED MOTOR ....... .......... .............. ................................. ..... .............. 11
CARRIAGE MOTOR .......... ....... ................. ............................ ..... ................... 12
PRINT WIRE DRIVE
...................................................................................... 13
PRINT WIRE COIL PROTECTION
......................................................... ...... ..... 14
PAPER CONTROL LOGIC ............................................................................. .
CARRIAGE POSITION AND HOME SENSOR
................................................... .
15
16
1526 • MPS 802 INTERFACE LOGIC ........................... ................................. 17
4023 INTERFACE LOGIC .......................... .................................................... 18
TROUBLESHOOTING GUIDES
................................................ ................................. 19
PCB PARTS LiST................................................................................................... 22
ROM UPGRADES .... .................................... ....... ................... .............. ..... ....... ... .... 24
1526 • MPS 802 SCHEMATIC ....... .................... ................... ......... ..... ............ ....... 24
DEVICE NUMBER CHANGE ...... ... .... .................... .......................... ....... .............. ..... 25
4023 SCHEMATIC ................................................................................................ 25
MECHANICAL ADJUSTMENTS
HEAD SHIFT
LEVER ............................................. ........................................ 26
PRINT HEAD ............................................................................................... 26
HOME SENSOR .......... ............ ............................................. ................... ..... 27
WIRING DIAGRAM
.................... ................... .............. ................................. ... ....... 28
MECHANICAL DISASSEMBLY ................................................................................. 29
ASSEMBLY NOTES
................................................................................................ 36
CASE WORK/POWER SUPPLY ................................................................................ 37
MECHANICAL ASSEMBLIES .. ................................................................................. 38