- If the detected temperature of the thermistor does not reach the targeted temperature within a specified period under the heater temperature control during the

initial rotation period.

2) Abnormal low temperature

- If the detected temperature of the thermistor is kept 100 deg C or lower for a specified period under the heater temperature control during the print period.

3) Abnormal high temperature

- If the detected temperature of the thermistor is kept 230 deg C or higher for a specified period.

4) Fixing heater drive circuit failure

- If the specified count of the ZERO CROSSING signal is not detected within a specified period after the printer is turned on.

- If the ZERO CROSSING signal is not detected for a specified period during the print period after the signal is once detected after the printer is turned on.

2.7 EXTERNAL AND CONTROLS SYSTEM

2.7.1 Power Supply

2.7.1.1 Power Supply

2.7.1.1.1 Low-voltage power supply

The low-voltage power supply and the fixing power supply convert AC power from the power receptacle into DC power to cover the DC loads.

- Low-voltage power supply:

Generates DC power required in the printer

- Fixing power supply:

Supplies AC power to the low-voltage power supply

Controls the fixing heater temperature in the fixing unit

AC input

Fuse

FU2801

Noise filter

Rectifyin g

circuit

For low pressure power, insert the AC power in the inlet, switch the power ON, and it will start. The AC power generates +3.3V in the fixing power, +24V in the

2-16

Fuse

FU2901

Noise filter

Protection circui t

+3.3V generation

circuit

+24V generation

circuit

Fixing power suppl y

Fixing control

circuit