RICOH AFICIO 180
Manual de Servicio

IMAGE FUSING

17 May, 1999

Fluorescent Lamp Flicker
Starting and stopping the fusing lamp power every second causes fluorescent lighting in the room to flicker. To reduce this flickering, use SP1-108 to change the cycle from 1 second to 3 seconds. In addition, full power is applied to the fusing lamp gradually, not all at once. This prevents the power in the room from dropping suddenly. This feature is known as �Soft Start�. The machine does this by gradually allowing more power to the fusing lamp over a number of zero-cross cycles of the ac supply. The diagram below shows full power being applied gradually over the duration of 6 zero-cross cycles. With SP1-107, this number can be set to 6, 10, or 20.

A250D888.WMF

Fusing Temperature Control for Thick Paper at the By-pass Tray
When thick paper mode is selected, the machine changes the target fusing temperature from 180°C to 190°C. This also happens when the machine detects A6 size. This is because the machine automatically assumes that the A6 paper is a post card, and post cards should be treated as thick paper.

Pre-heat Mode (Fusing Idling)
When the machine is powered on, or the right door is closed, the hot roller turns for 10 seconds. If the SP1-103 setting is 1 (Yes), when the fusing thermistor detects a temperature lower than 60°C, the hot roller turns for 60 seconds (instead of for just 10 s) after the machine is powered on, or the right door is closed. This maintains conditions for fusing copies made on thick paper during cold weather conditions.

To Prevent Offset when Making Multiple Copies on Small Paper
This prevents the temperature at the ends of the hot roller from being higher than at the center. If the smallest copy paper width detected during a one-minute interval is less than 220 mm, the machine lowers the target fusing temperature by 10°C. Then, during the next minute, if the smallest width detected is less than 220 mm again, the machine lowers the target temperature by another 5°C.
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