When the CPU on the DC controller outputs a fan full speed signal (FAN_FULL), the fan drive voltage switching circuit supplies a +24 V fan drive voltage to turn

the heat exhaust fan at the full speed.

2) Half-speed control

When the CPU on the engine controller outputs a fan half speed signal (FAN_HALF), the fan drive voltage switching circuit supplies a +16 V fan drive voltage to

turn the heat exhaust fan at the half speed.

Fan Control Sequence

E805-0000 (Main body fan error)

When the cooling fan of the main body starts, the fan lock detection signal (FAN_LOCK) has been held at the "H" level for longer than the prescribed time.

9.3 Power Supply System

9.3.1 Power Supply

9.3.1.1 Outline

When the main power switch (SW1) is turned on, AC power is supplied to the low-voltage power supply circuit in the power supply PCB.

The low-voltage power supply circuit supplies +3.3 V, +5 V, and +24 V to operate the machine.

+24 V is supplied to the motors, fan, electromagnetic clutch, solenoid, etc. +5 V and +3.3 V are supplied to the sensor, etc.

There are two types of +24 V voltages: +24 V which is normaly supplied from the low voltage power supply and +24 VR which is cut off when the front cover or

the left door is opened. The +24 VR also plays the role of a door open detection signal (DOPEN). This signal allows the CPU to detect that the front cover or the

left door has opened.

Part Name

Power supply PCB

Option power supply PCB (option)

Main power switch (SW1)

Front cover switch (SW2)

Left door switch (SW3)

9-2

Power switch ON/

Copy start key ON

Going out of sleep mode

INTR STBY