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The Opto-interrupter must be closed / interrupted manually by a piece inserted in the slot!

• Analog inputs are initially driven HIGH to simulate cold Fuser thermistors.
• The opto output is driven LOW to simulate an open (unblocked) interrupter.
• When backward motor movement is detected, the opto output is released to simulate a closed (blocked) interrupter.
• When the triac (originally used to switch the fuser heating lamp) is activated: • Digital lines are driven HIGH to simulate a hot Fuser. • Analog lines are switched back to input mode.
• If no triac activation occurs for 60 seconds, the system resets to the cold Fuser thermistors simulation.

The plots are created with the Arduino 1.x Serial Plotter. The Arduino 2.x Serial Plotter is not as powerful and uses a different data format.

Timing with inserted Fuser	Timing with inserted Fuser
Timing for simulated Fuser	Timing for simulated Fuser

Download and extract the repository. In the Arduino IDE open the sketch with File -> Open... and select the OkiFuserSimulation folder.

Connections on the CU/PU board: the relay connector is the wide flex cable at the bottom left, and the power connector is the large two-row connector at the bottom center.	Connections on CU/PU board from a different perspective	The Arduino Nano in the OKI
The Styrodur ramp coated with a green self adhesive	The slot for the paper jam sensor	Different perspective
Second paper jam sensor	Original pressure rollers, which were removed
Menu pages to select the front MP tray as paper source
		Fuser connector

                   ?  2 -   - 1  5V
                  5V  4 -   - 3  5V
        Logic Ground  6 -   - 5  Logic Ground
        Logic Ground  8 -   - 7  Logic Ground
             24 Volt 10 -   - 9  24 Volt
             24 Volt 12 -   - 11 24 Volt
        Power Ground 14 -   - 13 Power Ground
        Power Ground 16 -   - 15 Power Ground
     OptoTriac 1200W 18 -   - 17 10 k Thermistor
VCC for 2 OptoTriacs 20 -   - 19 OptoTriac 500W
       3.4 V Standby 22 -   - 21 Main On Indication
   OptoTriac Main On 24 -   - 23 Power Ground