44292401TH Rev.1
49 /
Oki Data CONFIDENTIAL
COMPOSITION/OPERATION
D. Control start decision
• Either of the following two control start decisions is made according to the temperature
detected by the temperature/humidity sensor. The fusing temperature during the print
cycle varies depending on the type of the start control carried out, either low temperature
start control or ordinary start control.
17.3.2
Wait control
• Control is provided to ensure that the temperatures at different parts of the fusing unit
reach a constant level during the wait state.
A. Control start timing
• At the end of the warm-up control
• At the end of the post-print cycle control (print start control)
B. Control termination timing
• The front cover is opened and closed.
• A malfunction or media misfeed occurs.
17.3.3
Print control
• To ensure a good fixing level and light transmission performance of the OHP transparen-
cies, the fusing speed and fusing roller temperature are controlled.
A. Control start timing
• A print request is received.
B. Control termination timing
• A malfunction or media misfeed occurs.
C. Print control temperatures
• The fusing roller temperature is set according to the type of media, main body interior
temperature (as measured by the temperature/humidity sensor), and warm-up start deci-
sion.
• For types of media other than plain paper, the fusing speed is controlled at the 1/2
speed.
D. Print control temperature adjustments
• The temperature during print control is adjusted using the menu available from the con-
trol panel. The temperature can, however, be decreased only.
• Adjustment steps are 0
q
C, -5
q
C, and -10
q
C.
Control start decision
Environment upon start
Low temperature start control
The temperature/humidity sensor detects a temperature lower than the
predetermined value.
Ordinary start control
The temperature/humidity sensor detects a temperature equivalent to,
or higher than, the predetermined value.
17.3.4
Protection against abnormally high temperature
17.3.4
Protection against abnormally high temperature
• The machine provides protection at three different stages to prevent abnormally high
temperature of the Fusing unit.
A. Soft protection
• If the Thermistor (TH1) detects a temperature exceeding a predetermined value, the mal-
function code representing abnormally high temperature is displayed. At this time, the
power supply line is shut down.
• If the temperature of the fusing roller does not reach a predetermined value within a
predetermined period of time after the start of the warm-up cycle, the power supply line
is shut down.
B. Hard protection
• If the CPU overruns and the output level of the CPU of the Mechanical control board
becomes a HIGH or LOW level, and not a pulse output, and a predetermined tempera-
ture or higher is detected, a circuit within the Mechanical control board turns OFF the
relay to shut down each power supply line.
C. Thermostat protection
• If detection of abnormally high temperatures by soft protect or hard protect cannot be
made due to a faulty Thermistor (TH), the thermostat operates at a predetermined tem-
perature to shut down the power supply line.
• If detection of abnormally high temperatures by soft protect or hard protect cannot be
made due to a faulty Thermistor (TH), the thermostat operates at a predetermined tem-
perature to shut down the power supply line.
17.3.5
PPM control
• PPM control is provided to prevent the temperature on edges of the heating roller from
increasing during a multi-print cycle using plain media of a small size.
• The distance between sheets of media is widened according to the number of printed
pages set to be produced and the media length. This evens out the temperature of the
heating roller and thus stabilizes fusing performance of the printed toner image.
• The PPM control is provided at 20 ppm for a multi-print cycle of producing 20 pages. The
number of printed pages per minute is established as detailed below for each media size
for the 21st and subsequent pages.
•
N
o PPM control is provided for a multi-print cycle of color printing, as it is 1/4 of the
monochrome printing.
Media conditions
PPM
A5, invoice
14ppm
Media having a narrower width and longer length than above
8
ppm
17.3.2
Wait control
17.3.3
Print control
17.3.5
PPM control
Summary of Contents for MC160MFP
Page 1: ...MC160MFP Maintenance Manual 011710A...
Page 18: ...44292401TH Rev 1 17 Oki Data CONFIDENTIAL MC160n Main body THEORY OF OPERATION...
Page 55: ...44292401TH Rev 1 54 Oki Data CONFIDENTIAL Auto Document Feeder Unit THEORY OF OPERARTION...
Page 61: ...44292401TH Rev 1 60 Oki Data CONFIDENTIAL MC160n Main body FIELD SERVICE...
