Oki OKIOFFICE44 Service Manual page 280

A3.1.12 R44 Circuit Diagram
1. Block diagram
The circuit diagram consists of the following connector:
• Connector CN6 that provides an interface between R44 board and power supply unit.
2. Function
1)
Sensor Type
PSIN1-N
WRSNS-N
PSOUT-N
TNRSNS-N
CVOPN-N
Board Descriptions
Sensor and switch control
Five types of sensors are used in the printer as listed below. All of their output enter IOGA
ports for referring to and processing by the CPU.
Figure A3.1.15 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.
Sensor Name
Inlet sensor 1 This photosensor is positioned before the resist roller to detect whether the paper
has entered into the printer section.
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
Outlet sensor Located at the exit of the printer to supervise the paper exit operation.
0: Paper exists, 1: Paper does not exist
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.
Cover open Detects whether the cover of the printer section is open or not.
sensor 0: Cover is open, 1: Cover is close
A - 38
Function
OKIOFFICE 44 Serv. Man., P/N 59276801