Oki OKIOFFICE84 Maintenance Manual page 285

A3.1.11 R51 Circuit Diagram (Page 11/12)
1. Block diagram
The circuit diagram shown on page 11/12 consists of the following connector:
• Connector CN6 that provides an interface between R51 board and power supply unit
(P2H).
• Connector CN7 that provides an interface between R51 board and power supply unit
(MPW1446/MPW1546).
• Connector CN8 that provides an interface between R51 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 A3.1.13 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 Type Sensor Name
PSIN-N Inlet sensor
WRSNS-N Write sensor
PSOUT-N Outlet sensor
TNRSNS-N Toner sensor
CVOPN-N Cover open
sensor
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
A3 - 15
Function
40672201TH Rev. 4
R51