Ricoh ps280, ps290 Service Manual

PAPER TRAY UNIT

(Machine Code: A549/550)

10 May 1996 SPECIFICATIONS

1. SPECIFICATIONS

Configuration:	Two-tray table or three-tray table
Copy Paper Size:	Maximum A3/11" X 17"
	Minimum B5/81/2" X 11"
Copy Paper Weight:	52 - 105 g/m2, 14 - 28 lb
Copy Paper Capacity:	Approximately 500 sheets
Paper Feed Speed:	20 ~ 40 copies/minute (A4 / 81/2"X11" sideways)
Power Source:	DC 24V, 5V and AC 120V, 220~240V from the
	main machine
Power Consumption:	Maximum 110.5 W
	Average 50 W
Dimensions:	620 mm/24.4" (width) X 632 mm /24.9" (depth) X
	390 mm/15.4" (height)
Weight:	Less than 36 kg/79.4 lb (Two-tray type)
	Less than 38 kg/83.8 lb (Three-tray type)

Options

A549/A550-1

COMPONENT LAYOUT

10 May 1996

2. COMPONENT LAYOUT

2.1 MECHANICAL COMPONENT LAYOUT

1

2

3

4

5

9

6

8 7

			A549V502.img
1.	Paper Tray 1	6.	Lower Right Door
2.	Pick-up Roller	7.	Paper Lift Motors
3.	Paper Feed Roller	8.	Paper Tray 3 (A549 model only)
4.	Relay Rollers	9.	Paper Tray 2
5.	Reverse Roller

A549/A550-2

10 May 1996

COMPONENT LAYOUT

2.2 DRIVE LAYOUT

1

4

8

2

7	1

3

4

5

4

6

A549V503.img

1.	Vertical Transport Roller Gears	6.	Main Motor
2.	Paper Feed Clutch 1	7.	Relay Clutch
3.	Paper Feed Clutch 2	8.	Timing Pulley

4.Separation Roller Gears

5.Paper Feed Clutch 3

Options

A549/A550-3

COMPONENT LAYOUT

10 May 1996

2.3 ELECTRICAL COMPONENT DESCRIPTION

Refer to the electrical component layout on the reverse side of the Point to

Point Diagram (on waterproof paper).

	Symbol	Index	Description	Note
		No.
	Motors
	M1	5	Main	Drives all the components of the paper tray
	M2	2	Tray lift 1	Raises the bottom plate in the paper tray
	M3	30	Tray lift 2
	M4	29	Tray lift 3 (A549 only)
	Circuit board
	PCB1	1	Interface board	Controls the paper tray in response to
				signals from the copier
	Sensors
	S1	7	Tray upper limit 1	Detects the top of the stack to stop the tray
	S2	18	Tray upper limit 2
	S3	19	Tray upper limit 3 (A549	lift motor
			only)
	S4	25	Relay 1	Detects the leading edge of the paper as it
	S5	23	Relay 2	leaves the tray to control pick-up solenoid
	S6	20	Relay 3	and jam detection timing
	S7	28	Paper end 1	Detects when the paper tray is empty
	S8	24	Paper end 2
	S9	21	Paper end 3 (A549 only)
	Switches
	SW1	22	Tray cover	Detects whether the tray unit cover is open
				and cuts the 24 Vdc power if it is
	SW2	3	Tray set 1	Detects whether the paper tray is in place
	SW3	4	Tray set 2
	SW4	6	Tray set 3 (A549 only)
	Magnetic clutches
	CL1	9	Paper feed 1	Starts feeding paper from the tray
	CL2	12	Paper feed 2
	CL3	15	Paper feed 3 (A549 only)
	CL4	11	Relay	Drives the rollers in the paper trays
	Solenoids
	SOL1	8	Paper pick-up 1
	SOL2	13	Paper pick-up 2	Lifts/drops the pick-up roller
	SOL3	16	Paper pick-up 3 (A549
			only)
	SOL4	10	Separation 1	Lifts/drops the separation roller
	SOL5	14	Separation 2
	SOL6	17	Separation 3
	Heaters
	H1	26	Tray (Option)	Turns on when the main switch is off to
	H2	27	Tray (Option)	keep the paper in the trays dry

A549/A550-4

10 May 1996

OVERVIEW

3. OVERVIEW

[A]

[A]

[A]

A549D502.img

There are two types of paper tray unit: the two-tray and three-tray types.

Each paper tray [A] is a drawer type that can hold up to 500 sheets of paper.

The paper feed mechanism uses an FRR feed system. The function of the system is exactly the same as for the main machine except that there is no paper size detection. The paper size for each paper tray is input at the operation panel, either by the user or by a technician.

All the electrical components of the paper tray are controlled by the copier main board through the tray interface board.

Options

A549/A550-5

DRIVE MECHANISM

10 May 1996

4. DRIVE MECHANISM

[E]

[B]

[D]

[F]

[A]

[C]

A549D503.img

All the tray rollers are driven by the main motor [A] via timing belts, clutches and a train of gears.

Drive is transmitted to the timing pulley [B] through the timing belt [C], relay clutch [D] and the gears.

Paper Feed Unit 1:

The drive from the timing pulley is transmitted to the unit through the timing belt [E].

Paper Feed Unit 2:

The drive from the timing pulley is directly transmitted to the unit.

Paper Feed Unit 3:

The drive from the timing pulley is transmitted to the unit through the timing belt [F].

The main motor and the relay clutch are energized at the same time that the

Start key is pressed.

The paper feed clutch is energized 300 ms after the main motor starts to rotate. When the paper feed clutch for the selected paper tray is energized, paper is fed from the paper tray to the main machine through the relay rollers.

A549/A550-6