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Chapter 7 Wiring Diagrams and Signal Information
♦ LVPS overcurrent protection circuit
This circuit stops all outputs, if the power supply voltage 24VDC, 5VDC, or 3.3VDC is shorted.
The circuit is reset, when after the cause of short was removed, the power is turned off, and then
on again after certain time.
* Note that the 5 V power supplies for the ESS and operation panel are excluded. The 5 VDC
power supplies cannot be restored since they use a fuse.
♦ LVPS overvoltage protection circuit
This circuit stops all outputs, if the power supply voltage 24VDC, 5VDC, or 3.3VDC exceeds the
specified voltage respectively.
At this time, the operating point is 32VDC or less for 24VDC, 7VDC or less for 5VDC, or 4.4V or
less for 3.3VDC.
The circuit is reset, when the power is turned off, and then on again after certain time.
♦ REAR FAN output circuit
For the xFAN REAR ON (H) signal, the output voltage varies depending on the status of FAN
LOW signal and FAN STOP signal.
LVPS FAN is controlled by FAN STOP signal only.
♦ Output stop by I/L Switch
Output is stopped by I/L Switch. +24VDC output from LVPS is stopped by turning off the I/L
Switch connected to LVPS.
Signal line name Description
24V OSC OFF Control signal for +24 VDC output (High: Output is stopped)
HEAT1
Control signal of Main Lamp placed in FUSER ASSY (LAMP
lights up at "High: HEAT1" and "Low:xHEAT1")
xHEAT1
HEAT2
Control signal of Sub Lamp placed in FUSER ASSY (LAMP
lights up at "High: HEAT1" and "LowxHEAT1")
xHEAT2
HEAT EN
Control signal for AC power supply for Main Lamp and Sub
Lamp placed in FUSER ASSY (High: AC power supply is output)
IL OPEN
Signal for opening/closing INTERLOCK SWITCH (High: Switch
opens)
SLEEP
Control signal for Sleep Mode (High: Output is stopped at +24
VDC, +5 VDC and +3VDC)
xREAR FAN STOP Control signal for REAR FAN (High: Fan rotates)
xREAR FAN LOW
Control signal for REAR FAN (High: Fan rotates at high speed/
Low: Fan rotates at low speed)
ALM FAN REAR Alarm signal for REAR FAN (High: Fan fails)
xLVPS FAN STOP Control signal for LVPS FAN (High: Fan rotates)
LV TYPE Identifying signal for LVPS
ALM FAN LVPS Alarm signal for LVPS FAN (High: Fan fails)
FAN LOW FAN STOP FAN REAR ON(H)
High High 24V
Low High 15V
High Low 0V
Low Low 0V