Canon ImageRunner iR8500 Series, Service Manual, Page: 269 / 1122

Chapter 5
5-17
F-5-24
5.3.3.4 Controlling Pre-Heat Voltage
0006-9430
iR105i/iR105+ / iR9070
A pre-heat voltage is applied to the fluorescnet lamp even when the lamp remains off so as to ensure an optimum intensity in the shortest time possible.
F-5-25
T-5-13
5.3.3.5 Initial Activation
0006-9433
iR105i/iR105+ / iR9070
The fluorescent lamp is turned on when the control panel power switch is turned on for the following:
[1] To stabilize the inside of the fluorescent lamp in the shortest time possible.
[2] To check the intensity by the light intensity sensor to determine pre-heat voltage.
Voltage Description
Standby
pre-heating 2.9 V Used to stabilize the heat inside the
fluorescent lamp while the lamp is off.
Pre-heating before
activation 4.1 V Applied 1.5 sec immediately before
turning on the fluorescent lamp,
thereby shortening the time until
optimum intensity is attained.
Pre-heating during
activation 3.9 V to 3.8 V (optimum level is
applied to suit the measurement
of the light intensity sensor) To stabilize the inside of the
fluorescent lamp during activation.
Main power
switch ON Control panel
switch ON Copy Start
key ON
INTR
WMUP WMUPR SLEEP
LSTR STBY SCFW SCRV STBY
Controlled
to 70˚C
Controlled to 70˚C
Initial
activation
70˚C
Fluorescent heater
(H5)
Scanning lamp
(FL1)
Main power
switch ON Control panel
power switch ON Copy Start
key ON
Original set
INTR LSTR STBY STBY
Controlled to 70˚C Controlled to 70˚C
1.5
sec 1.5
sec
70˚C
2.9V
2.9 V 4.1V 2.9V
4.1V
Intensity
check
Optimum value
WMUP WMUPR SLEEP SCFW SCRV
Optimum
value
Scanning lamp
(FL1)
Scanning lamp
pre-heat voltage
Fluorescent heater
(H5)
Continued application of pre-heat voltage
would hinder temperature control;
therefore, it is turned off and on in
conjunction with the scanner heater.
The intensity of light is checked by the intensity sensor to
determine the optimum level based on the measurement.
The scanning lamp is assumed to
have reached its optimum intensity
when the temperature of the area
around it reaches 70˚C. Then, the
pre-heat voltage is increased to
prepare for activation.