Ricoh A318 User manual

DOCUMENT FEEDER

1. SPECIFICATIONS
Original Size and Weight: – Thin original mode –
Maximum A3/11" x 17"
Minimum B6/51/2" x 81/2"
Weight 41 to 128 g/m2(11 to 34 lb)
– Thick original mode –
Maximum A3 / 11" x 17"
Minimum B6 / 51/2" x 81/2"
Weight 52 to 128 g/m2(14 to 34 lb)
– Auto reverse mode –
Maximum A3 / 11" x 17"
Minimum B6 lengthwise /
51/2" x 81/2" lengthwise
Weight 53 to 105 g/m2(14 to 28 lb)
Original Feed: Automatic feed — ADF mode
Manual feed one by one — SADF mode
Original Table Capacity: 35 sheets / 64 g/m2(17 lb)
Original Set: Face up. First sheet on top
Original Transport: One flat belt
Copy Speed: 20 copies/minute for A4/81/2" x 11" sideways
Power Consumption: 20 W
Dimensions (W x D x H): 670 x 460 x 103 mm (26.4" x 18.1" x 4.1")
Weight: Approximately 9.0 kg (19.916 lb)
Document
Feeder
1 May 1993 SPECIFICATIONS
1

2.COMPONENT LAYOUT
– Mechanical Components –
1.PulseGenerator Disk 6. Inverter Pawl
2. Friction Belt 7. Inverter Roller
3.Pick-upLever8. Transport Belt
4. Original Table 9. Pick-up Roller
5. Exit Roller 10. Feed Roller
– Electrical Components –
1. Original Set Sensor 9. DF Main Board
2.RegistrationSensor 10. Feed-outMotor
3.PulseGenerator Sensor 11. Inverter Solenoid
4.Original Width Sensor 12. Feed-outSensor
5.Pick-upSolenoid 13. Original Select Switch
6.BeltDriveMotor 14. Feed-inSolenoid
7.Indicator Panel 15. DF PositionSensor
8. Lift Switch (A054, A072, A111 copiers only)
123 456
789
10
1
2
34567
9
10
13
14 12
8
11
15
COMPONENTLAYOUT 1 May1993
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3. ELECTRICAL COMPONENT DESCRIPTIONS
Symbol Name Function Index No.
Motors
M1 Belt Drive Motor DC servomotor that drives to the transport belt
and feed-in system (pick-up roller, feed roller,
pull-out roller and relay roller).
6
M2 Feed-out Motor DC servomotor that drives the feed-out unit of
the DF. 10
Solenoids
SOL1 Pick-up Solenoid Energizes to press the pick-up lever against
the stack of originals in preparation for original
feed-in.
5
SOL2 Feed-in Solenoid Turns on to engage the feed-in clutch so
rotation is transmitted to the feed roller,
pull-out rollers, and relay rollers.
14
SOL3 Inverter Solenoid Energizes to invert the original when copying
two sided originals. 11
Switches
SW1 Lift Switch Informs the CPU when the DF is lifted and
also serves as the jam reset switch for the DF. 8
SW2 Original Select
Switch Selects thick original mode or thin original mode. 13
Sensors
S1 Original Set
Sensor Informs copier CPU that originals have been placed and causes the Insert Original
indicator to go out.
1
S2 Registration
Sensor Sets original stop timing and measures original length. 2
S3 Original Width
Sensor Determines the width of the originals. 4
S4 Pulse Generator
Sensor Generates pulses used to measure the original length. 3
S5 Feed-out Sensor Checks for original misfeeds and sets original
stop timing when in auto reverse mode. 12
S6 DF Position Sensor Detects when the document feeder is
positioned about 10 cm above exposure
glass. (A111 copier only)
Printed Circuit Boards
PCB1 DF Main Board Controls all DF functions. 9
PCB2 Indicator Panel
Board Contains operator indicators. 7
Document
Feeder
1 May 1993 ELECTRICAL COMPONENT DESCRIPTIONS
3

4. OVERALL MACHINE CONTROL
The DF CPU monitors the input signals from the sensors and switches, and
energizes the solenoids and the indicator LEDs directly. The belt drive motor
and the inverter motor are controlled by the DF CPU through their respective
driver ICs. The exchanged signals are shown in the tables on the next page.
DF Main Board (PCB1)
RXD
TXD
Copier Main Board (PCB1)
CPU
ROM
Driver
IC
Driver
IC
TXD
RXD
Feed-out
Motor
Belt Drive
Motor
Solenoids
Indicators
Sensors
Switches
OVERALL MACHINE CONTROL 1 May 1993
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1. DF →Copier
No.Signal Name Definition
1Original Set Originals have been set on the original table
2Copy Start Allowsthe copierto start the copysequence
3Lift Up The DFhas been lifted
4DF Misfeed A misfeed has occurred in the DF
2. Copier →DF
No.Signal Name Definition
1Feed-in Requeststhe DF to feed in the original
2Feed-out Requeststhe DF to feed out the original
3Invert Original Requeststhe DF to invert the original
4Auto Feed Shiftsthe DF to the auto feed mode
5Original Stay The machine attempted to use the DFbut an original from
the previous copy run remainson the exposure glass
31 October1995 OVERALL MACHINE CONTROL
5

5. BASIC OPERATION
1. One-sided Original Feed
When an original is inserted face up into the DF, the Insert Original indicator
light goes out and the DF informs the copier CPU that originals have been set.
When the Start key is pressed, the copier CPU sends the feed-in signal to
the DF. On receipt of this signal, the DF energizes the pick-up solenoid, the
feed-in solenoid, and the belt drive motor in order to feed-in the bottom sheet
of the original stack onto the exposure glass. The pick-up solenoid and the
feed-in solenoid remain energized until the original leading edge reaches the
DF registration sensor. The belt drive motor turns off shortly after the
original’s trailing edge passes the DF registration sensor.
While feeding the original, the DF registration sensor and the paper width
sensor check the original size.
Just when the original trailing edge has passed the DF registration sensor,
the DF CPU sends the copy start signal to the copier.
When the scanner reaches the return position, the copier CPU sends the
feed-out and the feed-in signals to the DF CPU in order to exchange the
original with the next original. At this time, the scanner begins returning to the
home position.
When the scanner comes to the return position after scanning the last
original, the copier CPU only sends the feed-out signal in order to feed-out
the last original.
BASIC OPERATION 1 May 1993
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2. Two-sided Original Feed
Unlike one-sided original feed, the back side of the original must be copied
first to keep the originals and copies in the correct order.
During original feed-in, the sequence is the same as for one-sided feed;
however, the DF CPU also energizes the inverter motor and the inverter
solenoid a short time after the original trailing edge has passed the DF
registration sensor. The belt drive motor continues to feed the original until
the original leading edge passes the feed-out sensor. At this point the inverter
mechanism inverts the original, in preparation for copying the back side.
Then the belt drive motor reverses and the original is fed towards the left
scale and is aligned against the scale. The DF CPU sends the copy start
signal a short time after the original trailing edge has passed the feed-out
sensor.
When the scanner reaches the return position, the copier CPU sends the
invert original signal to the DF CPU in order to make a copy of the front side.
The original is inverted in the same way as for back side copying.
3. Semi-automatic Document Feed
If a single original is inserted into the original table and copied, the DF shifts
to the semi-automatic feed mode and lights the Auto Feed indicator. The
Auto Feed indicator remains on for five seconds after the copier main motor
stops. If another original is inserted within that five-second period, it is
automatically fed and copied.
Document
Feeder
1 May 1993 BASIC OPERATION
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6.POWER DISTRIBUTION
6.1A110/A054 COPIERS
The DF uses threeDC power levels: +24volts,+12 volts, and +5 volts.
When the main switch is turned on, the option transformer receives the wall
outletacpower through the ac driveboard and outputs 10 volts acand26
volts ac totheoptiondcpower supply board.The option dc power supply
board thenconverts the 10volts ac inputto +5 volts dcandthe26 volts ac
input to+24 volts. Then,those twodc voltages are supplied totheDF main
board.
The regulator IC on the DF main boardfurther steps downthe+24 volts to
+12 volts.
115Vac 26Vac
10Vac
220/230/240Vac 5V
+12V+24V
+24V (VA)
+5V (VC)
Regulator
IC
DF Main Board
(PCB1)
AC Drive
Board
(PCB2)
Option
Transformer
(TR2)
Option DC
Power Supply
Board
(PCB6)
POWER DISTRIBUTION1 May1993
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6.2 A111 COPIER
The DF uses three dc power levels: +24 volts, +12 volts, and +5 volts.
When the main switch is turned on, the main transformer receives the wall
outlet ac power through the ac drive board and outputs 10 volts ac and 31
volts ac to the main dc power supply board. The main dc power supply board
then converts the 10 volts ac input to +5 volts dc and the 31 volts ac input to
+24 volts. Then, those two dc voltages are supplied to the DF main board
through the copier main board.
The regulator IC on the DF main board further steps down the 24 volts to +12
volts.
115Vac
220/230/240Vac
AC Drive
Board
(PCB2)
31Vac
10Vac
5V
+12V
+24V
+24V (VA)
+5V (VC)
Regulator
IC
DF Main Board
(PCB1)
Main
Transformer
(TR1)
+24V (VA)
+5V (VC)
Main DC
Power
Supply
Board
(PCB3)
Copier
Main
Board
(PCB1)
Document
Feeder
1 May 1993 POWER DISTRIBUTION
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