Ricoh FT6750 Service Manual
SECTION 1
OVERALL MACHINE
INFORMATION
1. SPECIFICATIONS
Configuration: Console
Number of Bins: 20 + Proof Tray
Paper for Proof Tray: Size: Maximum: A3, 11" x 17"
Minimum: A6 lengthwise,
51/2" x 81/2"
Weight: 52 ∼ 157 g/m2, 14 ∼ 41lb
Paper for Bins: Sort/Stack mode
Size: Maximum: A3, 11" x 17"
Minimum: A5 lengthwise,
51/2" x 81/2" lengthwise
Weight: 52 ∼ 93 g / m2, 14 ∼ 24 lb
Staple mode
Size: Maximum: A3, 11" x 17"
Minimum: B5, 81/2" x 11"
Weight: 64 ∼ 80g/m2, 17 ∼ 20 lb
10 July 1991
Paper Capacity: Proof tray: 150 sheets (80 g/ m2, 20 lb)
Bins:
1 sided copies 2 sided copies
Sort mode 50 Sheets 50 Sheets
Stack mode 40 Sheets 35 Sheets
(80 g/m2, 20 lb)
Staple Capacity: From 2 to 30 sheets (80 g/m2, 20 lb)
Staple Position:
a = 5 ± 2 mm (0.2" ± 0.08")
b = 5 ± 2 mm (0.2" ± 0.08")
a
b
1-1
10 July 1991
Staple Time: Within 2 seconds/staple
Staple Replenishment: Cartridge exchange (5,000 pieces/cartridge)
Power Source: AC 100 V (from copier)
Power Consumption: Average: less than 80 W
Maximum:
in sort/stack mode: less than 90 W
in staple mode: less than 170 W
Dimensions:
(W x D x H)
610 x 675 x 1035 mm
24.1" x 26.6" x 40.8"
Weight: Approximately 80 kg (177 lb)
1-2
2. COMPONENT LAYOUT
5
6
2.1 MECHANICAL COMPONENT LAYOUT
10 July 1991
11
10
12
13
14
1
2
3
4
9
8
1. Proof Tray
2. Vert ical Transport Rollers
3. Upper Entrance Guide
4. Lower Entrance Guide
5. Turn Gate
6. Diagonal Transport Rollers
7. 1st Horizontal Transport Roller
8. 2nd Horizontal Transport Roller
9. Distribution Rollers
10. Bin Gates
11. Bins
12. Grip Assembly
13. Jogger Plate
14. Stapler
1-3
7
3
5
10 July 1991
2.2 DRIVE LAYOUT
1
14
13
2
12
4
11
6
10
9
7
8
The drive train is as follows:
Proof Motor [1] Vertical Transport Rollers Drive Belt [14]
Main Motor [6]
Timing Belt [7] Timing Pulley [8]
2nd Horizontal Transport Roller [9]
Timing Pulley [5] Timing Belt [10] 1st Horizontal Transport
Roller [11]
11th∼20th Distribution
Rollers [4]
Timing Pulley [12]
Timing Belt [3] Diagonal Transport Rollers Drive Belt [13]
1st∼10th Distribution Rollers [2]
1-4
10 July 1991
2.3 ELECTRICAL COMPONENT DESCRI P TI ON
Please refer to the Electrical Comp on ent La you t on the Reverse side of the
Point to Point (Water Pro of Paper) fo r symbol an d ind ex number.
SYMBOL NAME FUNCTION
Motors
M1 Proof Drives the vertical transport rollers. 1
M2 Staple Unit Drive
M3 Stapler
M4 Grip
M5
M6 Jogger
M7 Main
Sensors
Bin Side Plate
Drive
Drives the staple unit up and down to the
appropriate bin.
Feeds the staples and drives the stapler
hammer.
Drives the grippers forward and backward into
the bin to grip the copies and bring them to the
stapling position.
Drives the bin side plate. 16
Drives the jogger plate to jog the copies against
the bin side plate.
Drives the distribution, horizontal transport, and
diagonal transport rollers.
INDEX
NO.
5
9
11
20
21
S1 Exit
S2 Staple Unit H.P. Detects if the staple unit is in the home position. 6
S3 Grip H.P. Detects if the grippers are in the home position. 10
S4
S5 Bin Transport
S6
S7
S8 Jogger H.P. Detects if the jogger plate is in the home position. 22
S9 Timing
Staple Unit
Position
Bin Side Plate
Release
Bin Side Plate
H.P.
Detects paper jams at the sorter exit (Proof
Tray).
Detects the position of the staple unit. 12
Detects paper jams between the entrance guide
and the horizontal transport rollers in the
sort/stack or staple mode.
Detects if the bin side plate is in the released
position.
Detects if the bin side plate is in the home
position.
Provides pulses to the sorter stapler main
control board.
2
15
18
19
24
1-5
10 July 1991
SYMBOL NAME FUNCTION
Detects if there is paper jams at the distribution
S10 Bin/Jam (LED)
Sensors
S11
S12 Paper Detects whether copies are under the hammer. 14
S13 Staple H.P.
S14 Staple End Detects the staple end 7
Switches
SW1 Door Safety Controls the 100 V ac line. 4
SW2 Door Safety Controls the 24 V dc line. 3
Solenoids
Bin/Jam (Photo
Tr.)
section and detects if there is paper in the bins
(light emitting element).
Detects paper jams at the distribution section
and detects if there is paper in the bins (light
receiving element)
Detects if the staple hammer is in the home
position.
INDEX
NO.
30
17
8
SOL 1 Grip
SOL 2 ∼20
SOL 21 Turn Gate
Circuit Board
PCB 1 Main Control Controls all sorter stapler functions. 26
PCB 2 Bin Solenoid
PCB 3 Bin Solenoid
Capacitor
C Main Motor Motor start capacitor. 23
Bin
Opens and closes the grippers to grip copies on
the bins.
Opens and closes the bin gate to direct the
copies into the appropriate bin.
Opens and closes the turn gate to direct the
copies into either the proof tray or the bins.
Interfaces between the bin gate solenoids (sol 2
∼ 10) and the main control board.
Interfaces between the bin gate solenoids (sol
11 ∼ 20) and the main control board.
13
28
29
27
25
1-6
3. BASIC OPERATION
[B]
3.1 NORMAL MODE AND SORT/STACK MODE
[F]
[D]
[A]
[C]
10 July 1991
[E]
Copies exiting the copier pass thro ug h the entrance guide plates [A] to the
turn gate section. The turn gate [B] will send copies eith er to the proof tray or
to the bins, depending on the mod e.
- Normal mode - (from the turn gate section to the proo f tra y)
The turn gate solenoid [C] is energized and the turn gate turns clockwise
when the start key is pressed. The proo f mot or [D] ro ta te s the vertica l
transport rollers [E] and exit roller [F]. The turn ga te direct s copie s thro ug h
the vertical transport sect ion to th e proof tray.
In this mode, if a misfeed is detected in the sorter stapler, th e pro of moto r
stops and the turn gate sole no id turns off. The main moto r starts rotating.
Copies going through the copier are sent to the 1st bin through the diagonal
transport, horizo nt al transport, and distribu tio n section.
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10 July 1991
- Sort/Stack mode - (fro m t he turn gat e sect ion to th e bin s)
[H]
[G]
[B]
[F]
[A]
[D]
[C]
[E]
The turn gate solen oid [A] stays off and th e turn gate [B] also stays up when
the start key is pressed. The main motor [C] rotates the diagonal transport
rollers [D], horizontal transpo rt rolle rs [E] , and dist ribu tio n rolle rs [F].
The turn gate directs copies to the diagonal tran spo rt section. The diagonal
transport section fee ds cop ies dia go na lly. This is beca use copies are brought
to the front side in advan ce for easier jogging.
Copies are directed to the distrib ut ion section through the diagonal and
horizontal transp ort section. The appropriate bin ga te [G] opens and copies
are delivered to each bin.
The jogger plate [H] the n jog s to squ are the copies each time.
In this mode, if a misfeed is detected in the sorter stapler, the main mot or
stops. The proof motor sta rts rot at ing and the turn gate solenoid energizes.
Copies going throu gh the copier are directed to the proo f tray.
1-8
3.2 STAPLE MODE
10 July 1991
[A]
1
2
3
4
When the final set of copies is jog ged in the sort mode (figure 1), the stap le
unit staples the stacked copies as follows:
The grippers (A) move forward, and grip the copies (f igu re 2). The grip pers
bring the copies up underneath the stapler (f igu re 3). The stapler staples the
copies (figure 4). The copies are pushed back into th e bin . The grippers open
and return to the home posit ion. The staple unit moves to th e next bin (figure
5).
When the final set of copies is sta ple d, the stap le unit is ra ised to th e home
position.
5
There are two staple modes.
1) Automatic stapling:
In ADF mode, when the staple mode is select ed before pressin g the start
key, copies will be delivered to each bin and sta ple d auto mat ically.
2) Manual stapling:
In sort mode, after copies are sort ed in bins, the copies will be stapled
when the staple key is pressed. In sta ck mode, manual stapling is
impossible.
1-9
SECTION 2
SECTIONAL DESCRIPTION
1. TURN GATE SECTION
[C]
[B]
10 July 1991
OFF
ON
[A]
[D]
The turn gate send s copies to the proof tray or th e bins depending on the
mode. In the normal mode , th e turn gate solenoid [A] turns on. The turn gate
[B], directs copies upward [C] th rough the vertical transport sect ion to the
proof tray.
In the sort, stack, or staple mode, the turn gate solenoid stays off. The tu rn
gate directs copies downward [D] to th e dia go nal t ran spo rt section.
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10 July 1991
2. DIAGONAL TRANSPORT SECTION
[B]
[A]
In the sort, stack, or staple mode , th e dia gona l tran sport rollers [A] bring the
copies to the front side du ring transportation. Copies go to the horizont al
transport section alon g the diagonal transpo rt sto pp er [B].
2-2
3. DISTRIBUTION SECTION
[B]
[E]
[C]
[A]
OFFON
10 July 1991
[D]
[F]
The distribution sect ion has the distribution rolle rs [ A] , 20 bin gates, and 19
bin gate solenoids (the 1st bin gate is always open).
When a bin gate solenoid [B] is of f, the return spring [C] holds the bin gate [D]
out of the paper path, allowin g the copies to pass to the upper bin.
The appropriate bin ga te solenoid turns on and open s the bin ga te . The other
solenoids are of f. Th e cop ies go to the bin [E] throug h th e ga te.
To prevent copies from curling an d so cau sing misstapling or wrong staple
positioning, th e bin has pa pe r flat teners [F] on the front side of th e bin .
2-3
C
10 July 1991
4. JOGGER SECTION
Copier
Main Motor
Jam Sensor
Jogger Motor
[B]
C
C: Depening on selected paper size.
[D]
[A]
When the start key is pressed in the sort, stack, or staple mode, the copier
sends the paper size informatio n to the sorte r stap ler un it. In acco rda nce with
this data, the jogger motor [A] drives th e jog ger plate [B] from the jogger
home position to where the width is 10 mm wider than the selected paper.
After the trailing edge of a copy passes th e jam sen sor (th e bin /ja m sensor),
and after the appropriate timing [C] for the select ed paper, the jogg er mot or
rotates and reverses. This makes the jogger plate push all the copies against
the bin side plate [D] to square the stack. Also, this makes the jogger plate
return to where the width is 10 mm wider than the selected pa pe r for the next
copy.
When the bin sensor in the bin/ja m sensor detects that all copies are
removed from the bins afte r jogg ing is fin ishe d, the jogg er pla te re tu rns to it s
home position.
2-4
10 July 1991
- Jogger off conditions -
1. Under the following conditions, the jogger plate does not jog after copies
are delivered to the bins.
• If paper is loaded in a bin by hand while the sort/sta ck, or
staple mode is selected.
• If the selected pape r size doe s not ma tch stap ling
specifications.
• If copies of different width are delivere d to the bins.
2. If paper is in a bin before the main switch is turned on, the sort /st ack
mode is disabled when th e sort er key is p resse d.
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10 July 1991
5. BIN SIDE PLATE DRIVE SECTION
[F]
[A]
[E]
[E]
[B]
[G]
[E]
[D]
[D]
[C]
The bin side plate [A] is alwa ys in the home posit ion except during the staple
operation. The bin side plate takes part in the jogger f un ctio n (see jogger
section).
In the staple mode when all the copies have been jogged by the jogger plate,
the bin side plate drive motor [B] rotates the cam drive plate [C]. The pin on
the cam drive plate raises and lowers the actu at or cam [D], and the actuator
cam makes the bin side plate [E] move to the front side . Thus, the bin side
plate does not interf ere wit h th e copies [F] being brought to th e sta ple
position by the grip assembly.
When the staple operation for the final set of co pie s is completed, the bin
side plate drive motor rotates th e cam drive plat e until th e bin side pla te
home position sensor [ G] is act ua te d. This makes the bin side plate re tu rn to
the home position.
2-6
6. STAPLE UNIT
6.1 STAPLE UNIT DRIVE MECHANISM
10 July 1991
[C]
[D]
[F]
The staple unit consists of the grip assemb ly [A] and the stap ler [B ]. The
staple unit is lowered from the home position (the first bin ) to the 20th bin in
order to staple the copies in each bin. The grip assemb ly grips th e cop ies
stacked in the bin and positions them underneath the stapler. The stapler
staples the copies.
[H]
[G]
[E]
[A]
[B]
When the first set of copies is stapled, the staple unit drive mot or [C] drives
the staple unit downward via timing pulleys [D], and timin g belts[ E] . While the
staple unit is being lowered , th e sta ple unit posit ion sensor [F] tracks the
position actuator plate [G], generating an on/off signal that is sent to the
sorter stapler main control board. This way, the posit ion of the staple unit is
detected and the staple unit drive moto r st ops t he stap le un it whe n it rea ches
the next bin. When the la st set of cop ies in the bin is stapled, the stap le un it
drive motor reverses until the sta ple unit home posit ion sensor [H] is
actuated. At this time, th e sta ple unit is in the home po sitio n.
Because lifting the unit req uire s mo re torque than lowering it, the lifting spe ed
is about one third of the lowering speed.
2-7
[J]
[H]
10 July 1991
6.2 GRIP ASSEMBLY
[E]
[C]
[B]
[F]
[D]
[A]
[I]
[G]
When the bin side plate sta rts movin g to the front side, the grip mo to r [ A]
drives the grippers [B] into the bin. The grippers track the grip per guide [C].
The grip motor stops the grippers at the grip position. The grip solen oid [D] is
energized and it closes the grippers to grip cop ies in th e bin . Whe n th e bin
side plate reaches th e front side, the grip motor reve rses an d brings the
grippers with the copies to the staple position. The paper sensor [E ] checks if
copies are brought to the staple position correctly. Then, the copie s are
stapled, and the grip motor drives the grippers with the sta ple d copies ba ck
into the bin .
When the grip solenoid turns off, the return spring [F] opens the grippers. The
copies remain in the bin. Then , th e grippers return to the home posit ion for
the next cycle.
The grip home position senso r [G] is actuated while the grippers move from
the home position [H] to the grip position [I]. This sensor is deactuate d while
the grippers move from the home position to the staple position [J]. The
sorter stapler main control board sends the approp riat e pulses to the grip
motor (stepper motor) to determine the grip position and sta ple posit ion .
When the main switch is turned on, the grip motor turns forwa rd an d
backward to check wheth er th e grippers are in the home positio n. If no t, the
grip motor returns the grippers to their home posit ion .
2-8
[H]
[F]
10 July 1991
6.3 STAPLER
[C]
[G]
[B]
[E]
[A]
[D]
The stapler motor [A] drives the sta ple sheet drive belt [B].
The staple sheets are fed under th e hammer [C] .
The stapler motor drives th e sta ple hammer via gears [D], two eccentric ca ms
[E], and two links [F].
When the aligned copies are brought to the staple position by the grippers,
the stapler motor starts rot ating. When the cams complete one rotation, th e
staple home position sensor [G] is d eactuated. The stapler motor then stops.
When the paper sensor in the grip assembly does not detect that the copies
are under the hammer, th e sta pler motor does not rotate.
A paper sheet [H] with a notch cut-in is positioned at the bottom of the staple
cartridge. This paper sheet is fed out aft er th e last stap le she et . Whe n th e
leading edge of the not ch in the sheet is detecte d by the staple end senso r
[I], the sorter sta ple r unit recognizes the staple ne ar en d con dition. After the
job is completed, the Add Sta ple indicator lights on the cop ier operation panel
and the Start key turns to re d whe ne ver the staple mode is selected.
[I]
2-9
10 July 1991
- Staple prohibit conditions -
1. Under the following conditions, the staple mode is prohibited when the
staple key on the operation panel is pressed.
• If paper is in a bin before the main switch is turned on.
• If the selected pape r size doe s not ma tch stap ling
specifications.
2. Under the following conditions, the staple mode is canceled.
• If paper is loaded in a bin by hand while the staple mode is
selected.
• If only one sheet is delivered to th e bin.
• If the number of sheets stapled excee ds the staple capacity.
3. Under the following conditions, the manu al sta plin g mode in sort mode is
prohibited.
• If paper is loaded in a bin by hand while the sort mode is
selected.
• If the paper size in the bin does not match sta plin g
specifications.
• If only one sheet is delivered to th e bin.
• If copies of different width are de livere d to the bin.
• If copies already stapled are left in the bin.
2-10
7. JAM DETECTION AND STAPLE ERROR
Copier Exit Sensor
J1
(1,300m sec)
J2
Sorter Exit Sensor
Bin transport
Sensor
Jam Sensor
360pls
J3
*This is jam checking timing for the 1st bin. Timing
depends on the bins.
(1,900m sec)
ON Check
220pls
J4
436pls*
436pls*
1 pulse ≈ 5.13 ms
J5
10 July 1991
J6
7.1 SORTER JAMS
The sorter stapler main control board detects jams when the following
conditions are detect ed . In these cases, a jam signal is sent to th e copier, the
copier stops the paper feed and indicates a sorter misfeed.
- Normal mode -
J1: The sorter exit sensor ha s not turned on for 1,300 ms after t he copie r exit
sensor turns off (paper check).
J2: The sorter exit sensor sta ys on fo r 1,9 00 ms or more (no pape r check).
- In sort/stack or staple mode -
J3: The bin transport senso r h as no t tu rned on for 360 pulses after the copier
exit sensor turns on (paper check).
J4: The bin transport senso r st ays on for 22 0 pu lses (no pap er check).
J5: The jam sensor has not tu rned on for the appropria te numb er of pulses
after the bin transport sen sor tu rns on (pap er che ck). This nu mbe r
depends on the bin. (See the diagram in the next page.)
J6: The jam sensor has not turne d of f afte r t he app rop riat e number of pulses
after the bin transport sen sor tu rns of f (no pap er che ck). This nu mbe r
depends on the bin. (See the diagram in the next page.)
2-11
10 July 1991
- Jam checking timing diagram -
Bin no. Pulses Bin no. Pulses
1 436 11 294
2 422 12 280
3 408 13 266
4 394 14 252
5 382 15 240
6 368 16 226
7 354 17 214
8 342 18 200
9 328 19 186
10 314 20 174
7.2 STAPLE ERROR
The sorter stapler main control board detects a staple error when the
following conditions are detected.
Error 1 The paper sensor in the grip assembly turns on (paper is still in
the grip assembly) while the staple unit is being lowere d.
In this case, a staple error sign al is sent to the copier. The copier
cancels the staple mode and indicates a staple error.
After paper left in th e grip pe rs is remo ved , the staple unit returns
to the home position. Whe n the staple key is pressed, th e stapler
begins to staple the rest of the copie s st art ing from th e bin
following the bin where the jam happened.
Error 2 The paper sensor in the grip assembly does not turn on (paper is
not in the grip assembly) when the grippers are in the staple
position.
In this case, the staple unit skip s stap ling this bin and moves to
the next bin for staplin g.
2-12
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