Read Sharp AR-651 (serv.man8) Service Manual online
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
AR-651/810 GENERAL OPERATIONS 4 - 4
0
22
536
1365
1423
1906
236
1365
250
3680
220
830
260
830
890
1790
1280
1830
1270
1780
260
3240
3330
430
260
4040
2980
2470
Timing chart for copying one A4 sized sheet fed from the 1st cassette
Scanner motor
Exposure lamp
Drum motor
1st cassette feed clutch
1st cassette feed sensor
Registration sensor
Registration motor
MVDEN signal
Main charger
Developer bias
Discharge lamp
Exit sensor
Forward rotation
Reverse rotation
(ms)