Ricoh Mp C3000 Service Manual

							Detailed Section Descriptions 
SM 15 B792 
B792 
Finisher 
2.2   DETAILED SECTION DESCRIPTIONS 
2.2.1  OUTPUT TRAY MECHANISM 
Stack Height Detection 
 
Stack height detection lever [A]: Driven  by stack height lever solenoid [B].  
Two sensors detect the height of the stack in the output tray: the stack height [C] and lever 
[D] sensors. 
Stack height sensor  Lever 
sensor  Status
 
Off Off  The stack height is below the target. The output tray 
is then lifted to t
he target position. 
Off  On  Target stack height position 
On On  The stack height is above the target. The output tray 
is then lowered to the target position. 
On 
Off  The stack height detecti on lever is at home position. 
Off: Actuator not in sensor 
At the start of a print job, the solenoid tu rns off. The stack height detection lever comes 
down, to detect the current stack level.  
When a sheet of paper is being fed out, the solenoid turns on and the lever goes back up 
to home position (inside the unit). After  paper has been fed out, the solenoid turns on 
again, and the lever detects the level of the stack.  
						

							Detailed Section Descriptions 
B792 16  SM 
Output Tray Up/Down Mechanism 
 
Overview  
The output tray motor gear [A] lifts/lowers the tray if the stack height is not at the target 
position.  
Gears [B] and [C] keep the angle of the tr ay constant at any tray position. 
Output Tray Downward Movement  
The top of the paper stack is checked afte r every page (or set of pages) has been fed out. 
If the top of the stack is higher than the target  level, the output tray motor moves the tray 
down. 
When the stack near-limit sensor [D] detects  the actuator on gear [C], a stack near-limit 
signal is transferred to the main frame. The tr ay cannot move any lower. The next time the 
top of the stack height is above t he target level, printing stops. 
Output Tray Upward Movement  
If paper is removed from the stack, the top of the stack will be lower than the target level, 
and the output tray motor moves the tray up.  
When the tray upper limit sensor  [E] detects the actuator on gear [B], the tray cannot be 
moved up any more, so the motor stops.  
						

							Detailed Section Descriptions 
SM 17 B792 
B792 
Finisher 
2.2.2 PAPER FEED 
 
When a sheet of paper is fed, it is transpor ted through the 500-sheet finisher as shown in 
these drawings. 
To feed paper straight through the finisher, the pick-up roller [A] stays up.  
To send the paper to the jogger tray [B], when  the trailing edge is almost out of the finisher, 
the pick-up roller moves down until the reverse/ exit roller in the pick-up roller pushes the 
paper against the paddle roller [C]. The revers e/exit roller feeds the paper to the jogger 
tray. 
The pick-up roller is lifted up and down by the pick-up roller contact motor. 
The pick-up roller feeds the paper out after stapling, sorting, or stacking. 
The reverse/exit motor contro ls the reverse/exit motor. The other rollers do not change 
direction, and are controlled by the paper transport motor.  
						

							Detailed Section Descriptions 
B792 18  SM 
2.2.3 JOGGER MOVEMENT 
 
The jogger tray unit consists of the front [A ] and rear [B] jogger fences, two jogger motors 
[C] and two jogger fence HP sensors [D].  
Standby mode:   
The jogger fences are pl aced at home position. 
Sort mode:  
The joggers move alternate sets to the front  and rear, to separate the sets for the users. 
At the start of the job, the jogger f ences move to the front and rear sides. 
When the first set of the job is fed to the jo gger tray, the front jogger fence moves towards 
the rear to stack the paper neatly. 
When the second set of the job is fed, the r ear jogger fence moves towards the front to 
stack the paper neatly. 
The front and rear fences cont inue to operate like this for alternate sets, until the end of 
the job. 
Staple mode:  
Only the front jogger fence moves in staple mode.   
						

							Detailed Section Descriptions 
SM 19 B792 
B792 
Finisher 
2.2.4  STAPLER UNIT MOVEMENT 
Overview 
 
The stapler unit [A] is driven by the stapler  unit movement motor [B]. The stapler unit HP 
sensor [C] detects when the stapler is at hom e position. The stapler unit stays at its home 
position in stand-by mode. 
This finisher has three types of stapling.  The stapler unit moves as shown: one staple at 
the rear corner [D], one staple at the  front corner [E] and two staples [F].  
						

							Detailed Section Descriptions 
B792 20  SM 
Disabling the Stapling Mechanism 
 
The stapler unit moves from front to rear. Bu t there are three end fences [A] on the jogger 
tray unit in the stapler unit path. In order not  to staple these fences, the stapler unit has the 
end fence detection sensor [C]. When the stapl er unit passes the end fence, the end fence 
pushes the actuator [B], and  then the sensor detects the end fence. While this sensor 
detects the end fence, st apling is disabled.  
2.2.5 JAM CONDITIONS 
  Sensors  Conditions 
Remaining paper detection  Entrance 
Exit  Either the entrance or 
exit sensor detects 
paper just after the unit is initialized. 
Non-feed at the entrance  Entrance  The entrance sensor is not activated within 
a certain period after the paper exit sensor 
detects paper. 
Jamming at the entrance  Entrance The entrance sensor 
is not de-activated 
after paper is fed 1.3 times the length of 
the paper. 
Non-feed inside the unit 
(Straight feed out mode 
only)  Exit 
The exit sensor is not activated within a 
certain period after the entrance sensor 
detects paper. 
Jamming at the exit 
Exit The exit sensor is 
not de-activated after 
paper is fed for a certain period. 
Jogger tray  Exit The exit sensor is de-activated during 
paper shifting or stapling. 
  
						

							Detailed Section Descriptions 
SM 21 B792 
B792 
Finisher 
2.2.6 ERROR DETECTION 
  Conditions 
Jogger motor error  The jogger home position sens
or does not shut off after 
the jogger motor starts. 
Jogger motor home position 
detection error  The jogger home position sens
or does not turn on after 
paper shifting. 
Stapler error  The stapler home position sensor (inside the stapler unit) 
does not turn on after stapling. 
Output tray upper limit error  The tray
 upper limit sensor is activated. 
Output tray motor error The output tray is away from 
the target position for more 
than 10 seconds. 
Stack height detection error  The stack height detection lever does not return to its 
home position before going to detect the stack height. 
 
ƒ  The above errors are indicated as “Fin isher jam” at the first occurrence.  
ƒ  If the same error happens again in the nex t job, “finisher error” is indicated. 
  
						

							 
BOOKLET FINISHER B793 
 
BOOKLET FINISHER SR3000 REVISION HISTORY 
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