Power Supply System; Power Supply; Outline (When The Duplex Unit Is Not Equipped) - Canon iR2422 series Service Manual

Chapter 9
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 duplex unit is not equipped)

9-2
Power switch ON/
Copy start key ON
Going out of sleep mode
INTR STBY
Heat Discharge Fan
(FM1)
Registration sensor
(SR209)
Fixing Drive Motor
(M201)
WMUPR PRINT PRINT
: Full speed (+24V) : Half speed (+16V)
F-9-4
Power switch OFF/
Going into sleep mode
LSTR STBY
30sec
0020-4163