Oki B 4100 Maintenance Manual page 399

1. Block diagram
The circuit diagram shown on page 12/12 consists of the following connector:
• Connector CN6 that provides an interface between R44 board and power supply unit.
2. Function
1) 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.
2) Fuser unit temperature control
Sensor Type
PSIN1-N Inlet sensor 1
WRSNS-N Write sensor
PSOUT-N Outlet sensor
TNRSNS-N Toner sensor
CVOPN-N Cover open
sensor
40055101TH Rev.4
Sensor Name
This photosensor is positioned before the resist roller to detect whether the paper
has entered into the printer section.
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
Located at the exit of the printer to supervise the paper exit operation.
0: Paper exists, 1: Paper does not exist
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.
Detects whether the cover of the printer section is open or not.
0: Cover is open, 1: Cover is close
Function
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