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DFX-8500
2.3.3 Sensor Circuits
Figure 2-18 shows the sensor circuits in block diagram form. The printer is equipped with the following
sensors:
1. Front and rear PE sensors (use a photo intermpter)
2. Top PE sensor (to detect the TOF position, uses a photo interrupter)
3. Paper jam sensor (uses a magnetic transistor)
4. Tractor select sensor (uses a micro mechanical switch)
5. Pull tractor sensor (uses a micro mechanical switch)
6. CR encoder sensor (uses a photo interrupter)
7. PG encoder sensor (uses a photo interrupter)
8. PG home sensor (uses a micro mechanical switch)
9. Ribbon jam sensor (uses a photo interrupter)
10. Cover open sensor (uses a micro mechanical switch)
11. Printhead temperature sensor (uses,a thermistor)
12. Head fan temperature sensor (uses a thenistor)
13. Paper width sensor (uses a photo reflector)
14. CR motor isolation resistance sensor (monitored by the analog port of the CPU)
15. PSB/PSE board power off sensor (signal intedace)
CPU
TMP95C061 (ICZ)
1
Figure 2-18. Sensor Circuit Block Diagram
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2-22 Rev. A