III-7
3.5
Scanner Unit
(1)
Remove the three screws.
(2)
Lift the scanner unit to obtain access to the panel sensor PCB.
(3)
Disconnect the three scanner unit connectors from the panel sensor PCB.
(4)
Remove the screw and disassemble the Toner sensor PCB from the Scanner unit.
Fig. 3.6
NOTE: Never touch the inside of the scanner unit or the mirror when disassembling or
reassembling. If there is any dirt or dust on the mirror, blow it off.
3.6
Main PCB Assy
(1)
Remove the four screws securing the main PCB holder to the back of the printer.
(2)
Grasp the hooks at the left and right ends of the PCB holder and draw out the main
PCB assy.
Fig. 3.7
I/F Shield assy
Hook
Rail
Main PCB assy
Hook
Mirror
Screws
Toner sensor PCB
S Seal sponge 1
Panel sensor PCB
Connectors (P2, P3, P9)
Scanner unit
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 ...