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10 August, 2001 

ELECTRICAL COMPONENT DESCRIPTION 

B408-13 

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4.3  ELECTRICAL COMPONENT DESCRIPTION 

Symbol Name 

Function 

Index 

No. 

Motors 

M1 

Upper 
Transport 

Drives the entrance roller, upper transport 
rollers, and upper exit tray rollers. 

32 

M2 

Lower 
Transport 

Drives the lower transport rollers and 
positioning roller. 

29 

M3 

Jogger Fence 

Drives the jogger fences. 

26 

M4 

Staple Hammer  Drives the staple hammer. 

17 

M5 

Stack Feed-out 

Drives the stack feed-out belt. 

27 

M6 

Exit Guide Plate  Opens and closes the exit guide plate. 

M7 

Exit 

Drives the lower tray exit rollers and the shift 
roller. 

31 

M8 

Lower Tray Lift 

Moves the lower tray up or down. 

23 

M9 

Shift 

Moves the shift roller from side to side. 

11 

M10 

Stapler 

Moves the stapler unit from side to side. 

25 

 

 

 

 

Sensors 

S1 

Entrance 

Detects copy paper entering the finisher and 
checks for misfeeds. 

S2 

Paper Limit 

Detects when the paper stack height in the 
upper tray is at its limit. 

S3 

Jogger Fence 
HP 

Detects when the jogger fence is at home 
position. 

12 

S4 

Shift HP 

Detects when the shift roller is at home position. 

10 

S5 

Stack Feed-out 
Belt HP 

Detects when the stack feed-out belt is at home 
position. 

19 

S6 

Stapler HP 

Detects when the stapler is at home position. 

14 

S7 

Exit Guide Plate 
HP 

Detects when the exit guide plate is at home 
position. 

S8 

Stapler Tray 
Entrance 

Detects copy paper entering the stapler tray and 
checks for misfeeds. 

15 

S9 

Lower Tray Exit  Checks for misfeeds. 

S10 

Stack Height 

Detects the top of the copy paper stack. 

S11 

Lower Tray 
Lower Limit 

Detects when lower tray is at its lower limit 
position. 

24 

S12 

Stapler Tray 
Paper 

Detects when there is copy paper in the stapler 
tray. 

16 

S13 

Staple Sheet 

Detects the leading edge of the staple sheet. 

18 

S14 

Stapler Rotation 
HP 

Detects when the staple hammer is at home 
position. 

20 

S15 

Staple 

Detects whether there are staples in the staple 
cartridge. 

21 

 

 

 

 

Solenoids 

SOL1 

Tray Junction 
Gate 

Drives the tray junction gate. 

22 

SOL2 

Stapler Junction 
Gate 

Drives the stapler junction gate. 

30 

Summary of Contents for SR790

Page 1: ...1000 SHEET FINISHER Machine Code B408...

Page 2: ...off the main power switch and unplug the machine before beginning any of the procedures in this section NOTE This manual uses the following symbols See or Refer to Screws Connector Clip ring E ring 1...

Page 3: ...n exit guide plate B 3 Upper side cover C x 2 4 Front cover support plate D x 1 5 Front cover E 6 Front inner cover F x 2 7 Harness G 8 Unhook the spring H 9 Turn the stapler unit I and take it out 10...

Page 4: ...6 July 2002 MOTORS B408 3 Peripherals 1 3 MOTORS 1 3 1 SHIFT MOTOR 1 Rear cover 1 1 2 Shift motor A x 2 x 1 1 3 2 STAPLER MOTOR 1 Rear cover 1 1 2 Stapler motor A x 2 x 1 B408R123 WMF B408R124 WMF A A...

Page 5: ...R TRANSPORT MOTOR AND EXIT MOTOR 1 Rear cover 1 1 2 Motor assembly A x 4 x 2 3 Upper transport motor B x 4 4 Exit motor C x 4 1 3 4 LOWER TRANSPORT MOTOR 1 Main PCB 1 1 2 Lower transport motor A x 2 x...

Page 6: ...ND SENSORS 1 4 1 PREPARATION 1 Front cover and inner cover 1 2 2 Upper side cover A x 2 3 Upper tray B x 1 4 Lower side cover C x 2 5 Loosen the 2 screws D 6 Lower the lower tray guide plate E 7 Guide...

Page 7: ...SORS 26 July 2002 B408 6 1 4 2 STACK HEIGHT SENSOR 1 Stack height sensor assembly A x 1 2 Stack height sensor B x 1 1 4 3 STAPLER TRAY PAPER SENSOR 1 Stapler tray paper sensor A x 1 B408R121 WMF B408R...

Page 8: ...6 July 2002 MOTORS AND SENSORS B408 7 Peripherals 1 4 4 LOWER TRAY LIFT MOTOR 1 Lower tray lift motor A x 2 x 1 1 4 5 STACK FEED OUT MOTOR 1 Stack feed out motor A x 2 x 1 B408R119 WMF B408R122 WMF A...

Page 9: ...urns off Tray exit sensor Off check The tray exit sensor does not turn off within the normal time after it turns on Stapler tray entrance sensor On check The stapler tray entrance sensor does not swit...

Page 10: ...table below SW100 1 2 Description 0 0 Normal operation mode Default 1 0 Packing mode Before packing the machine do the following Set switch 1 to 1 then back to zero The lower tray moves to the lowest...

Page 11: ...2 Upper Tray Exit Roller 3 Entrance Roller 4 Tray Junction Gate 5 Upper Transport Roller 6 Stapler Junction Gate 7 Lower Transport Rollers 8 Stapler 9 Stack Feed out Belt 10 Positioning Roller 11 Shif...

Page 12: ...ht Sensor 8 Lower Tray Exit Sensor 9 Lower Tray Upper Limit Switch 10 Shift HP Sensor 11 Shift Motor 12 Jogger Fence HP Sensor 13 Positioning Roller Solenoid 14 Stapler HP Sensor 15 Stapler Tray Entra...

Page 13: ...23 Lower Tray Lift Motor 24 Lower Tray Lower Limit Sensor 25 Stapler Motor 26 Jogger Fence Motor 27 Stack Feed out Motor 28 Main Board 29 Lower Transport Motor 30 Stapler Junction Gate Solenoid 31 Ex...

Page 14: ...per tray is at its limit 2 S3 Jogger Fence HP Detects when the jogger fence is at home position 12 S4 Shift HP Detects when the shift roller is at home position 10 S5 Stack Feed out Belt HP Detects wh...

Page 15: ...g roller 13 Switches SW1 Lower Tray Upper Limit Detects when the lower tray is at its upper limit position 9 SW2 Front Door Safety Cuts the dc power when the front door is opened 6 SW3 Upper Cover Cut...

Page 16: ...DRIVE LAYOUT 1 Exit Motor 2 Upper Transport Motor 3 Lower Transport Motor 4 Shift Motor 5 Exit Guide Plate Motor 6 Lower Tray Lift Motor 7 Stack Feed out Motor 8 Jogger Motor 9 Stapler Motor B408D105...

Page 17: ...n gate solenoid C and stapler junction gate solenoid D Upper Tray Mode The tray junction gate solenoid remains off The copies go up to the upper tray Sort Stack Mode The tray junction gate solenoid tu...

Page 18: ...July 2002 UPPER TRAY B408 17 Peripherals 4 6 UPPER TRAY When the paper limit sensor A switches on during feed out for each of three consecutive sheets of paper paper overflow is detected B408D109 WMF...

Page 19: ...y is removed the stack height sensor F turns off and the tray lifts up Then the tray stops when the sensor turns on again the tray pushes up the feeler If the stack height sensor fails the lower tray...

Page 20: ...transport roller the shift motor turns on driving the shift gear disk and the link D After the paper is delivered to the lower tray E the shift roller moves to its home position which is detected by t...

Page 21: ...ositioning roller C pushes the copy against the bottom of the stack stopper D For the horizontal paper alignment the jogger front fence E and the rear fence F move to the waiting position which is 18...

Page 22: ...e A is moved up to make a gap between the exit rollers This operation is done for all paper sizes but is only needed for the larger sizes The exit guide plate motor B and exit roller release cam C con...

Page 23: ...unit or no staples in the staple cartridge staple end is indicated on the operation panel The stapler sensor C detects this The stapler rotation HP sensor D checks whether the staple hammer mechanism...

Page 24: ...its home position to the stapling position If two staple position mode is selected the stapler moves to the front stapling position first then moves to the rear stapling position However for the next...

Page 25: ...s it to the shift roller The shift roller takes over stack feed out after the leading edge reaches this roller Just before the stapled stack passes through the lower tray exit sensor the stack feed ou...

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