Oki OKIFAX4550, Maintenance Manual

Page: 325 / 592

41309401TH Rev.4
325 /
Sensor Type
PSIN-N Inlet sensor This photosensor is positioned before the resist roller to detect whether
the paper has entered into the printer section.
Sensor Name Function
WRSNS-N Write sensor Detects the arrival of paper at designated position on the paper transport
route inside the printer in order to turn on the light of the LED head.
0: Paper exists, 1: Paper does not exist
PSOUT-N Outlet sensor Located at the exit of the printer to supervise the paper exit operation.
0: Paper exists, 1: Paper does not exist
TNRSNS-N Toner sensor Detects the remaining toner in the toner cartrige.
"The length of time of low-toner state within fixed time interval" detects a
low-toner state.
CVOPN-N Cover open
sensor Detects whether the cover of the printer section is open or not.
0: Cover is open, 1: Cover is close
3.11 46F Circuit Diagram (11/13)
1. Block diagram
46F-PCB circuit diagram (11/13) shown the consists of the following connector:
• Connector CN6 that provides an interface between 46F board and power supply unit (P2H).
• Connector CN7 that provides an interface between 46F board and power supply unit
(MPW1446/MPW1546).
• Connector CN8 that provides an interface between 46F board and power supply unit (P6L).
2. Function
1)
Sensor and switch control
Five types of sensors are used in the printer as listed below. All of their output enter IOGA4
ports for referring to and processing by the IOGA4 (CPU).
Figure A.16 (1/4) shows sensors and switch control.
• Inlet sensor 1
• Write sensor (To detect the paper top position for printing)
• Outlet sensor
• Toner end sensor
• Cover status switch
The functions of various sensors are described in the following table.
Table A.1 shows the method of toner low detection