Ricoh G104, Service Manual

Page: 572 / 601

Fusing
G160/G161 6-22 SM
ƒ Other types of job: SP 1104 27
Corrections for Small Paper Sizes (less than A5)
These corrections prevent too much heating of the fusing unit when paper widths less than
A5 are used. In multi-page printing with this size of paper, the heating roller’s temperature
is not the same in all areas because the small size paper does not go through the two ends
of the heating roller. The temperature of locations that do not touch the paper becomes
higher than other locations during multi-page printing. The following corrections decrease
this problem.
ƒ
Print speed: This is decreased after 15 pages. Then, 30 seconds after this, the print
speed increases to the standard temperature again. You can adjust this with SP 1911 1
to 3.
ƒ Fusing temperature: This is decreased in three stages, as shown below.
ƒ Decreased by 2ºC after 30 pages (G160)/ 25 pages (G161) are printed (controlled
by SP 1911 4 and 14)
ƒ Decreased by 5ºC again after 20 more pages (G160)/ 10 more pages (G161) are
printed (controlled by SP 1911 6 and 16)
ƒ Reduced by 5ºC again after 50 more pages (G160)/ 15 more pages (G161) are
printed (controlled by SP 1911 8 and 18)
There are also temperature reductions for one-sided printing and two-sided printing.
ƒ One sided printing: The temperature is decreased in two steps as shown below
ƒ After 100 pages, decreased by 2ºC (controlled by SP 1911 21 and 23)
ƒ After 30 more pages (G160)/ 15 more pages (G161), decreased by 5ºC (controlled
by SP 1911 22 and 24)
ƒ Duplex printing: The temperature is decreased in two steps as shown below
ƒ After 80 pages, decreased by 2ºC (controlled by SP 1911 25 and 27)
ƒ After 20 more pages (G160)/ 10 more pages (G161), decreased by 5ºC (controlled
by SP 1911 26 and 28)
Overheat Protection
ƒ If the heating roller temperature becomes higher than 230°C, the CPU cuts off the
power to the heating lamp and SC543 shows.
ƒ If 250°C is detected, the thermostat is opened, and then the heating lamp power is cut
off. SC545 shows.
ƒ If the thermistor output is less than 0°C for six seconds, SC541 occurs.
ƒ If the heating lamp gets full power for 8 seconds after the heating roller gets to the
print ready temperature, SC545 occurs.
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA