i
CONTENTS
CHAPTER I FEATURES AND SPECIFICATIONS....................................................... I-1
1.3.1 CPU Core ................................................................................................................................. II-5
1.3.2 ASIC ......................................................................................................................................... II-7
1.3.3 ROM ....................................................................................................................................... II-13
1.3.4 DRAM ..................................................................................................................................... II-13
1.3.5 Optional RAM ......................................................................................................................... II-15
1.3.6 Optional Serial I/O ................................................................................................................. II-16
1.3.7 EEPROM ................................................................................................................................ II-16
1.3.8 Reset Circuit........................................................................................................................... II-17
1.3.9 CDCC I/O ............................................................................................................................... II-18
1.3.10 Engine I/O .............................................................................................................................. II-19
1.3.11 Paper Feed Motor Drive Circuit .............................................................................................. II-21
2.2.1 Paper Supply.......................................................................................................................... II-25
2.2.2 Paper Registration.................................................................................................................. II-25
2.2.3 Paper Eject............................................................................................................................. II-26
Summary of Contents for HL-720
Page 1: ...SERVICE MANUAL MODEL HL 720 730 730Plus R LASER PRINTER ...
Page 36: ...II 19 1 3 10 Engine I O HL 720 Fig 2 21 shows the engine interface circuit Fig 2 21 ...
Page 37: ...II 20 HL 730 730Plus Fig 2 22 shows the engine interface circuit Fig 2 22 ...
Page 61: ... Fig 3 18 2 4 1 1 1 ...
Page 92: ...SERVICE MANUAL MODEL HL 760 R LASER PRINTER ...
Page 109: ...II 8 1 3 4 DRAM Two 4M bit DRAMs x 16bits are used as the RAM Fig 2 6 ...
Page 113: ...II 12 1 3 10 Engine I O Fig 2 12 shows the engine interface circuit Fig 2 12 ...
Page 114: ...II 13 1 3 11 Paper Feed Motor Drive Circuit Fig 2 13 ...
Page 133: ...Appendix 2 Main PCB Circuit Diagram 1 3 CODE UK3227000 B48K272CIR 1 3 NAME ...
Page 134: ...Appendix 3 Main PCB Circuit Diagram 2 3 CODE UK3227000 B48K272CIR 2 3 NAME ...
Page 135: ...CODE UK3227000 B48K272CIR 3 3 NAME Appendix 4 Main PCB Circuit Diagram 3 3 ...