Canon mf3220, mf3228, mf3240 Service Manual

2-7

scanner motor, and high-voltage system and puts the printer unit in an error state.

a) the reading of the main thermistor does not exceed 50 deg C within 2.34 sec after the start-up temperature control mechanism is started.

b) the CPU detects that the reading of the main thermistor remains 235 deg C or more for 1 sec continuously while fixing temperature control is under way.

c) the CPU detects that the reading of the main thermistor remains 100 deg C or less for 1.2 sec continuously while paper passage temperature control is under way;

or the CPU detects that the reading of the main thermistor remains 50 deg C or less for 0.3 sec continuously while between-sheets temperature control is under

way.

d) the CPU detects that the reading of the main thermistor remains less than 20 deg C for 0.3 sec continuously while fixing heater temperature control is under way.

e) the temperature of the main thermistor does not exceed 100 deg C within 20 sec after the start of start-up temperature control.

f) the CPU detects that the reading of the sub thermistor remains less than 35 deg C for 0.15 sec continuously while fixing heater temperature control is under way.

g) the CPU detects that the reading of the sub thermistor remains 320 deg C for 0.15 sec continuously while fixing heater temperature control is under way.

The machine's SCNT PCB are equipped with a lithium battery (1 pc.) serving as a backup source of power in the event of a power shortage or when the power plug

is removed.

T-2-6

LISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.

DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS.

SCNT PCB

litium battery (3V,220mAh)

Life

5yr or more (with power plug removed)

Replacement

not possible in the field on its own.