Ricoh FT6750 Service Manual

SECTION 1

OVERALL MACHINE

INFORMATION

10 July 1991

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
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

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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:	610 x 675 x 1035 mm
(W x D x H)	24.1" x 26.6" x 40.8"
Weight:	Approximately 80 kg (177 lb)

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10 July 1991

2. COMPONENT LAYOUT

2.1 MECHANICAL COMPONENT LAYOUT

12	13	14
		1

2

3 4

5

6

11

10

	9
		8	7
1.	Proof Tray	8.	2nd Horizontal Transport Roller
2.	Vertical Transport Rollers	9.	Distribution Rollers
3.	Upper Entrance Guide	10.	Bin Gates
4.	Lower Entrance Guide	11.	Bins
5.	Turn Gate	12.	Grip Assembly
6.	Diagonal Transport Rollers	13.	Jogger Plate
7.	1st Horizontal Transport Roller	14.	Stapler

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10 July 1991

2.2 DRIVE LAYOUT

1

14

2

13

3

4

12

5

11

6

10	9	8	7

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]

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10 July 1991

2.3 ELECTRICAL COMPONENT DESCRIPTION

Please refer to the Electrical Component Layout on the Reverse side of the Point to Point (Water Proof Paper) for symbol and index number.

	SYMBOL	NAME	FUNCTION	INDEX
				NO.
	Motors
	M1	Proof	Drives the vertical transport rollers.	1
	M2	Staple Unit Drive	Drives the staple unit up and down to the	5
			appropriate bin.
	M3	Stapler	Feeds the staples and drives the stapler	9
			hammer.
			Drives the grippers forward and backward into
	M4	Grip	the bin to grip the copies and bring them to the	11
			stapling position.
	M5	Bin Side Plate	Drives the bin side plate.	16
		Drive
	M6	Jogger	Drives the jogger plate to jog the copies against	20
			the bin side plate.
	M7	Main	Drives the distribution, horizontal transport, and	21
			diagonal transport rollers.
	Sensors
	S1	Exit	Detects paper jams at the sorter exit (Proof	2
			Tray).
	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	Staple Unit	Detects the position of the staple unit.	12
		Position
			Detects paper jams between the entrance guide
	S5	Bin Transport	and the horizontal transport rollers in the	15
			sort/stack or staple mode.
	S6	Bin Side Plate	Detects if the bin side plate is in the released	18
		Release	position.
	S7	Bin Side Plate	Detects if the bin side plate is in the home	19
		H.P.	position.
	S8	Jogger H.P.	Detects if the jogger plate is in the home position.	22
	S9	Timing	Provides pulses to the sorter stapler main	24
			control board.

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10 July 1991

	SYMBOL	NAME	FUNCTION	INDEX
				NO.
			Detects if there is paper jams at the distribution
	S10	Bin/Jam (LED)	section and detects if there is paper in the bins	30
			(light emitting element).
	Sensors
		Bin/Jam (Photo	Detects paper jams at the distribution section
	S11		and detects if there is paper in the bins (light	17
		Tr.)
			receiving element)
	S12	Paper	Detects whether copies are under the hammer.	14
	S13	Staple H.P.	Detects if the staple hammer is in the home	8
			position.
	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
	SOL 1	Grip	Opens and closes the grippers to grip copies on	13
			the bins.
	SOL 2 20	Bin	Opens and closes the bin gate to direct the	28
			copies into the appropriate bin.
	SOL 21	Turn Gate	Opens and closes the turn gate to direct the	29
			copies into either the proof tray or the bins.
	Circuit Board
	PCB 1	Main Control	Controls all sorter stapler functions.	26
	PCB 2	Bin Solenoid	Interfaces between the bin gate solenoids (sol 2	27
			10) and the main control board.
	PCB 3	Bin Solenoid	Interfaces between the bin gate solenoids (sol	25
			11 20) and the main control board.
	Capacitor
	C	Main Motor	Motor start capacitor.	23

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10 July 1991

3. BASIC OPERATION

3.1 NORMAL MODE AND SORT/STACK MODE

[F]

[D]

[E]

[B]

[A]

[C]

Copies exiting the copier pass through the entrance guide plates [A] to the turn gate section. The turn gate [B] will send copies either to the proof tray or to the bins, depending on the mode.

- Normal mode - (from the turn gate section to the proof tray)

The turn gate solenoid [C] is energized and the turn gate turns clockwise when the start key is pressed. The proof motor [D] rotates the vertical transport rollers [E] and exit roller [F]. The turn gate directs copies through the vertical transport section to the proof tray.

In this mode, if a misfeed is detected in the sorter stapler, the proof motor stops and the turn gate solenoid turns off. The main motor starts rotating. Copies going through the copier are sent to the 1st bin through the diagonal transport, horizontal transport, and distribution section.

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10 July 1991

- Sort/Stack mode - (from the turn gate section to the bins)

[H]

[G]

[B]

[F]

[A]

[D]

[C]

[E]

The turn gate solenoid [A] stays off and the turn gate [B] also stays up when the start key is pressed. The main motor [C] rotates the diagonal transport rollers [D], horizontal transport rollers [E], and distribution rollers [F].

The turn gate directs copies to the diagonal transport section. The diagonal transport section feeds copies diagonally. This is because copies are brought to the front side in advance for easier jogging.

Copies are directed to the distribution section through the diagonal and horizontal transport section. The appropriate bin gate [G] opens and copies are delivered to each bin.

The jogger plate [H] then jogs to square the copies each time.

In this mode, if a misfeed is detected in the sorter stapler, the main motor stops. The proof motor starts rotating and the turn gate solenoid energizes. Copies going through the copier are directed to the proof tray.

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10 July 1991

3.2 STAPLE MODE

[A]

1	2

3

4	5

When the final set of copies is jogged in the sort mode (figure 1), the staple unit staples the stacked copies as follows:

The grippers (A) move forward, and grip the copies (figure 2). The grippers bring the copies up underneath the stapler (figure 3). The stapler staples the copies (figure 4). The copies are pushed back into the bin. The grippers open and return to the home position. The staple unit moves to the next bin (figure

5).

When the final set of copies is stapled, the staple unit is raised to the home position.

There are two staple modes.

1) Automatic stapling:

In ADF mode, when the staple mode is selected before pressing the start key, copies will be delivered to each bin and stapled automatically.

2) Manual stapling:

In sort mode, after copies are sorted in bins, the copies will be stapled when the staple key is pressed. In stack mode, manual stapling is impossible.

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SECTION 2

SECTIONAL DESCRIPTION

10 July 1991

1. TURN GATE SECTION

[C]

OFF

ON

[B]

[A]

[D]

The turn gate sends copies to the proof tray or the bins depending on the mode. In the normal mode, the turn gate solenoid [A] turns on. The turn gate

[B], directs copies upward [C] through the vertical transport section to the proof tray.

In the sort, stack, or staple mode, the turn gate solenoid stays off. The turn gate directs copies downward [D] to the diagonal transport section.

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10 July 1991

2. DIAGONAL TRANSPORT SECTION

[B]

[A]

In the sort, stack, or staple mode, the diagonal transport rollers [A] bring the copies to the front side during transportation. Copies go to the horizontal transport section along the diagonal transport stopper [B].

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10 July 1991

3. DISTRIBUTION SECTION

[B]

ON OFF	[D]

[E]

[C]

[A]

[F]

The distribution section has the distribution rollers [A], 20 bin gates, and 19 bin gate solenoids (the 1st bin gate is always open).

When a bin gate solenoid [B] is off, the return spring [C] holds the bin gate [D] out of the paper path, allowing the copies to pass to the upper bin.

The appropriate bin gate solenoid turns on and opens the bin gate. The other solenoids are off. The copies go to the bin [E] through the gate.

To prevent copies from curling and so causing misstapling or wrong staple positioning, the bin has paper flatteners [F] on the front side of the bin.

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10 July 1991

4. JOGGER SECTION

Copier

Main Motor

Jam Sensor

Jogger Motor

[B]

C 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 information to the sorter stapler unit. In accordance with this data, the jogger motor [A] drives the jogger 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 the jam sensor (the bin/jam sensor), and after the appropriate timing [C] for the selected paper, the jogger motor 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 paper for the next copy.

When the bin sensor in the bin/jam sensor detects that all copies are removed from the bins after jogging is finished, the jogger plate returns to its home position.

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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/stack, or staple mode is selected.

∙If the selected paper size does not match stapling specifications.

∙If copies of different width are delivered to the bins.

2.If paper is in a bin before the main switch is turned on, the sort/stack mode is disabled when the sorter key is pressed.

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10 July 1991

5. BIN SIDE PLATE DRIVE SECTION

[F]

[A]

[E]

[E]

[B]	[E]

[G] [D]

[D]

[C]

The bin side plate [A] is always in the home position except during the staple operation. The bin side plate takes part in the jogger function (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 actuator cam [D], and the actuator cam makes the bin side plate [E] move to the front side. Thus, the bin side plate does not interfere with the copies [F] being brought to the staple position by the grip assembly.

When the staple operation for the final set of copies is completed, the bin side plate drive motor rotates the cam drive plate until the bin side plate home position sensor [G] is actuated. This makes the bin side plate return to the home position.

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10 July 1991

6. STAPLE UNIT

6.1 STAPLE UNIT DRIVE MECHANISM

[C]

[D] [E]

[F]	[H]

[A]

[B]

[G]

The staple unit consists of the grip assembly [A] and the stapler [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 assembly grips the copies stacked in the bin and positions them underneath the stapler. The stapler staples the copies.

When the first set of copies is stapled, the staple unit drive motor [C] drives the staple unit downward via timing pulleys [D], and timing belts[E]. While the staple unit is being lowered, the staple unit position 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 position of the staple unit is detected and the staple unit drive motor stops the staple unit when it reaches the next bin. When the last set of copies in the bin is stapled, the staple unit drive motor reverses until the staple unit home position sensor [H] is actuated. At this time, the staple unit is in the home position.

Because lifting the unit requires more torque than lowering it, the lifting speed is about one third of the lowering speed.

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10 July 1991

6.2GRIP ASSEMBLY

[B][F]

[D]

[E]

[C]

[A]	[J]
	[H]
[G]	[I]

When the bin side plate starts moving to the front side, the grip motor [A] drives the grippers [B] into the bin. The grippers track the gripper guide [C].

The grip motor stops the grippers at the grip position. The grip solenoid [D] is energized and it closes the grippers to grip copies in the bin. When the bin side plate reaches the front side, the grip motor reverses and 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 copies are stapled, and the grip motor drives the grippers with the stapled copies back into the bin.

When the grip solenoid turns off, the return spring [F] opens the grippers. The copies remain in the bin. Then, the grippers return to the home position for the next cycle.

The grip home position sensor [G] is actuated while the grippers move from the home position [H] to the grip position [I]. This sensor is deactuated while the grippers move from the home position to the staple position [J]. The sorter stapler main control board sends the appropriate pulses to the grip motor (stepper motor) to determine the grip position and staple position.

When the main switch is turned on, the grip motor turns forward and backward to check whether the grippers are in the home position. If not, the grip motor returns the grippers to their home position.

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10 July 1991

6.3 STAPLER

[C]

[G]

[B]

[F]

[E]

	[A]	[H]
		[I]
[D]

The stapler motor [A] drives the staple sheet drive belt [B].

The staple sheets are fed under the hammer [C].

The stapler motor drives the staple hammer via gears [D], two eccentric cams

[E], and two links [F].

When the aligned copies are brought to the staple position by the grippers, the stapler motor starts rotating. When the cams complete one rotation, the staple home position sensor [G] is deactuated. The stapler motor then stops.

When the paper sensor in the grip assembly does not detect that the copies are under the hammer, the stapler 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 after the last staple sheet. When the leading edge of the notch in the sheet is detected by the staple end sensor [I], the sorter stapler unit recognizes the staple near end condition. After the job is completed, the Add Staple indicator lights on the copier operation panel and the Start key turns to red whenever the staple mode is selected.

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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 paper size does not match stapling 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 the bin.

∙If the number of sheets stapled exceeds the staple capacity.

3.Under the following conditions, the manual stapling 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 stapling specifications.

∙If only one sheet is delivered to the bin.

∙If copies of different width are delivered to the bin.

∙If copies already stapled are left in the bin.

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1 pulse ≈ 5.13 ms

10 July 1991

7. JAM DETECTION AND STAPLE ERROR

	Copier Exit Sensor	(1,300m sec)
	J1
	Sorter Exit Sensor	J2 (1,900m sec)
	360pls	J3 ON Check
		220pls
	Bin transport
		J4
	Sensor	436pls*

J5 436pls*

J6

Jam Sensor

*This is jam checking timing for the 1st bin. Timing depends on the bins.

7.1 SORTER JAMS

The sorter stapler main control board detects jams when the following conditions are detected. In these cases, a jam signal is sent to the copier, the copier stops the paper feed and indicates a sorter misfeed.

- Normal mode -

J1: The sorter exit sensor has not turned on for 1,300 ms after the copier exit sensor turns off (paper check).

J2: The sorter exit sensor stays on for 1,900 ms or more (no paper check).

- In sort/stack or staple mode -

J3: The bin transport sensor has not turned on for 360 pulses after the copier exit sensor turns on (paper check).

J4: The bin transport sensor stays on for 220 pulses (no paper check).

J5: The jam sensor has not turned on for the appropriate number of pulses after the bin transport sensor turns on (paper check). This number depends on the bin. (See the diagram in the next page.)

J6: The jam sensor has not turned off after the appropriate number of pulses after the bin transport sensor turns off (no paper check). This number depends on the bin. (See the diagram in the next page.)

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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 lowered.

In this case, a staple error signal is sent to the copier. The copier cancels the staple mode and indicates a staple error.

After paper left in the grippers is removed, the staple unit returns to the home position. When the staple key is pressed, the stapler begins to staple the rest of the copies starting from the 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 skips stapling this bin and moves to the next bin for stapling.

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