Cpm Down Mode - Ricoh B064 Service Manual

6.10.7 CPM DOWN MODE

CPM (Copies Per Minute) Down Control adjusts the copy speed automatically
when printing OHP (transparencies) or extremely thick paper from the bypass tray.
Slowing down the paper as it goes through the fusing unit makes the paper spend
more time in the fusing unit. This compensates for the loss of temperature caused
by the demand on the hot roller.
When feeding special paper such as tab paper or thick paper from a paper station
other than the by-pass tray, the copy speed can be adjusted with SP1901 (CPM
Down Setting for Special Paper). A slower speed selection ensures better fusing.
Adjusting SP1901 does not affect fusing temperature control.
6.10.8 FUSING TEMPERATURE CONTROL
This machine uses either on/off control or phase control to control the temperature
of the hot roller. Before shipping, the machine is set for on/off control.
Generally, phase control is used only if the customer has a problem with electrical
noise or interference on the power line. Phase control can be selected with
SP1104 001 (Fusing Temperature Control).
The thermistor contacting the center of the hot roller surface monitors the
temperature of the hot roller. The CPU turns the fusing lamps on and off to keep
the hot roller surface at the target temperature. The target temperature depends on
the paper type.
• Normal: 185°C±5 (365°F±9) – Adjust with SP1105 001
• OHP: 165°C (329°F) – Adjust with SP1105 003
• Thick: 195°C (374°F) – Adjust with SP1105 005
As shown in the illustration, at power on when the temperature is less than 100°C,
there is an interval of 70 s during which the hot roller rotates before printing starts
(this is called 'fusing idling'). This interval allows the hot roller to reach the control
temperature. At power on when the temperature is over 100°C, printing can start
as soon as the hot roller reaches the warm-up temperature of 182°C.
NOTE: 1) SP1103 (Fusing Idling) adjusts the fusing idling time if fusing on the first
and second copies is incomplete due to low room temperature.
2) SP1106 (Fusing Temperature Display) displays the current center and
end temperatures for the hot roller.
SM
IMAGE FUSING AND PAPER EXIT
6-109 B064/B065