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 interrupter)

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 thermistor)

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 interface)

CN10 CN14 CN3

CN10 CN14 CN3

ENCA ENCB

PGENCA PGENCB PG Home

E05B36 (IC1) TRSEL PTRCT

PJAM FPE

RPE TPE RBJAM

_0 ENCA

ENCB

CN4 CR Encoder

PGENCA PGENCB

O PG Home

O Tractor Select

O Pull Tractor

O PaperJam

O Front PE

O RearPE

O TopPE

O Ribbon Jam

CN14

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