Sharp AR-651 (serv.man23) Service Manual ▷ View online
AR-651/810 COPY PROCESS 3 - 11
Process
AR-650/800
AR-651/810
12. Fusing
(1) System
Long-life heat roller system
Same as AR-650/800
· Fuser roller:
· Fuser roller:
Fluoroplastic-coated roller (ø60)
Fluoroplastic-coated roller (ø60)
· Pressure roller:
· Pressure roller:
PFA tube roller (ø60)
PFA tube roller (ø60)
(2) Cleaning
· Fuser roller cleaning roller (ø33)
· Cleaning web (for fuser roller cleaning)
· Cleaning felt roller (ø27)
· Pressure roller cleaning felt roller (ø28) · Pressure roller cleaning felt roller
· Cleaning metal roller
· Pressure roller cleaning metal roller
(3) Heater
Halogen lamp (Lamp system)
IH coil (Induction heating system)
(Lamp rating: 800W + 300W)
ON/OFF control by thermistor
Same as AR-650/800
AR-651/810 GENERAL OPERATIONS 4 - 1
4. GENERAL OPERATIONS
4. 1. Overview of Operation
Copier operation
Operation during warming-up, pre-running and standby
Automatic feed copying by pressing [START] key
Copying operation
Bypass copying
Interrupt copying
4. 2. Operation
4. 2. 1. Warming-up
(1) Initialization
• Power turned ON
• IH coil turned ON
• Set number “1” and “WAIT WARMING UP” displayed
• Fan motors turned ON
• Scanning section initialization
~ Carriage moving to home position and stopping there
~ Carriage moving to peak detection position
~ Exposure lamp turned ON ~ Peak detection (White color is detected by the shading correction plate.)
~ Exposure lamp turned OFF
~ Carriage moving to home position
• Feed unit initialization
~ Each cassette tray going up
• Writing section initialization
~ Polygonal motor rotating
~ Beam position controlled
• Other
~ Main charger cleaner operating
(2) Pre-running operation
Pre-running operation is started when the temperature of the fuser roller reaches a certain temperature.
(Pre-running is not carried out when the fuser roller has been already hot enough.)
• Fuser roller rotating
• Drum rotating
~ Drum motor, used toner transport motor turned ON
• Image quality control
~ Patch formed on drum and its reflective ratio read out to set an optimal condition.
(3) When fuser roller temperature becomes sufficient for fusing:
• IH coil turned OFF
• Set number “1” and “READY” displayed
AR-651/810 GENERAL OPERATIONS 4 - 2
4. 2. 2. Standby state (ready for copying)
• Keys on control panel enabled
• When no key is pressed for a certain period of time:
~ Set number “1” and reproduction ratio “100%” displayed and copier returning to normal standby
state
4. 2. 3. Cassette feed copying with [START] key ON
(1) [START] key ON
• “READY” display changed to “COPYING”
• Main charger, developer bias and discharge lamp turned ON/Each fan rotating at a high speed
• Drum, transfer belt, fuser unit and developer unit rotating
(2) Cassette paper feeding
• Feed motor and feed clutch turned ON
~ Pickup roller, feed roller and transport roller rotating
• Paper reaching transport roller
~ Cassette transport sensor turned ON
• Feed clutch turned OFF after a certain period of time
• Paper reaching registration roller
~ Registration sensor turned ON and aligning performed
• Feed motor stopping after a certain period of time
(3) Carriage operation
•
Exposure lamp turned ON
→
White shading compensation is carried out.
•
Scanning motor turned ON
→
Carriages 1 and 2 start to advance.
•
Copier entering toner supply operation with developer material toner density being lower than pre-set
value
(4) In a certain time after carriage operation:
•
Registration motor turned ON
→
Paper is sent to the transfer section.
•
Copies counted
(5) In a certain time after registration motor is turned ON:
• Transfer charger ON
(6) Carriage scanning termination
•
Scanning motor turned OFF
•
Exposure lamp turned OFF
•
Registration motor turned OFF (after paper trailing edge has passed registration sensor)
AR-651/810 GENERAL OPERATIONS 4 - 3
(7) Paper discharging
•
Exit sensor detecting passing of paper trailing edge
•
Main charger, developer bias and discharge lamp turned OFF
•
Each operation of drum, transfer belt, fuser unit and developer unit stopping and each fan returning
to standby mode rotation
•
“READY” displayed and copier entering standby mode
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