Fusing Lamp Control - Gestetner A294 Service Manual

FUSING

2.10.4 FUSING LAMP CONTROL

⇒
➀
After turning the main switch on, the CPU turns on all three fusing lamps one at a
time, with a 1 second interval between each lamp turning on. This prevents the
power on the AC line from dropping suddenly.
When the fusing temperature reaches 155°C, the machine starts the process
control data initialization. If the fusing temperature was already above 100°C when
the main switch was turned on, the process control initial setting is not done.
⇒
When the fusing temperature reaches 155°C, the copier starts fusing idling. If the
fusing temperature was already above 100°C at power on, fusing idling is not done.
When the temperature has reached 177°C, the warm-up period is completed and
⇒ the "Ready" indicator turns on. After this, the machine maintains a fusing
temperature of 173°C (A294) or 178°C (A295).
In stand-by mode, one of the fusing lamps turns on alternately to maintain the
⇒
ready temperature. During the copy cycle, the three fusing lamps maintain the
operating temperature of 188°/183°C (A294) or 198°/193°C (A295). If they have to
turn on, they turn on one at time, with a 1 second interval between each lamp.
The CPU changes the fusing lamp on period depending on the temperature
measured by the thermistor, to keep the fusing temperature as close as possible to
the target temperature.
If one lamp breaks during copying, the machine still works. But, if it discovers a
broken lamp just after being switched on, an SC occurs and copying is impossible.
The machine uses on-off control mode to maintain the fusing temperature.
Even if thick paper mode is selected, fusing temperature control does not change.
A294/A295
CÓPIA NÃO CONTROLADA
173°C(A294)
178°C(A295)
177°C
155°C
➁ ➂
A294D627.WMF
CÓPIA NÃO CONTROLADA
188°C (A4/LT width or less) (A294)
198°C (A4/LT width or less) (A295)
Operating Temperature
183°C (Greater than A4/LT width) (A294)
193°C (Greater than A4/LT width) (A295)
➀
➁
➂
➃
➄
➃ ➄
2-104
Rev. 06/2000
: Main switch on
: Process control data initial
setting start, and idling start
: Idling end
: Stand-by
: Start copying (Oper. Temp.)
SM