Ricoh FT4418 Service manual

SECTION 1

OVERALL MACHINE

INFORMATION

1 June 1990

1. SPECIFICATIONS

Configuration:

		Desk top
Copy Process:		Dry electrostatic transfer system
Originals:		Sheet/Book
Original Size:		Maximum A3/11"x17"
Copy Paper Size:		Maximum A3/11"x17"
		Minimum A6/5 1/2" x 8 1/2" (lengthwise)
(Duplex Copying)		A4 and B5/8 1/2" x 11" (sideways)
Copy Paper Weight:		Cassette feed: 52 to 157 g/m2 (14 to 42 lb)
		Paper tray feed: 64 to 90 g/m2 (17 to 22 Ib)
		Manual feed: 52 to 157 g/m2 (14 to 42 lb)
		Duplex: 59 to 104 g/m2 (16 to 27 lb)
Reproduction Ratio:		2 Enlargement and 3 Reduction
			A4/A3 Version		LT/LDG Version
	Enlargement		141%		155%
			122%		129%
	Full size		100%		100%
			93%		93%
	Reduction		82%		74%
			71%		65%
Zoom:		From 50% to 200% in 1% steps
Copying Speed:		18 copies/minute (A4/8 1/2" x 11" sideways)
		10 copies/minute (A3/11" x 17")
Warm-Up Time:		60 seconds (at 20oC)
First Copy Time:		5.9 seconds (A4/8 1/2" x 11" sideways)
Copy Number Input:		Ten keys, 1 to 99 (count up)
Manual Image Density		7 steps
Selection:

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1 June 1990
Automatic Reset:		1 minute standard setting; can also be set to 3
		minutes or no auto reset.
Paper Capacity:		Cassettes: 500 sheets
		Paper tray: 250 sheets
		Manual feed table: 50 sheets
Toner Replenishment:		Black: Cartridge exchange (370g/cartridge)
		Color (red, blue, & green): Cartridge exchange
				(310g/cartridge)
Copy Tray Capacity:		250 sheets (B4/8 1/2" x 14" and smaller)
		100 sheets (A3/11" x 17")
Power Source:		110V/ 60Hz/ 15A
		115V/ 60Hz/ 15A
		220V/ 50Hz/ 8A
		220V/ 60Hz/ 8A
		240V/ 50Hz/ 8A
		(Refer to the serial number plate (rating plate) to
		determine the power source required by the
		machine.)
Power Consumption:		Maximum:		1.2 kw
		Warm-up:		0.72 kw (average)
		Ready: 0.16 kw (average)
		Copy cycle:		0.81 kw (average)
Dimensions:
		Width		Depth		Height
	Copier only	672 mm		600 mm		410 mm
		(26.5")		(23.7")		(16.2")
	Full system	1149 mm		600 mm		513 mm
		(45.3")		(23.7")		(20.2")
Weight:		Copier only: 52 kg (114.7 Ib)
		Full system: 71 kg (156.6 Ib)
Optional Equipment:		Document feeder
		10 bin sorter
		Duplex unit
		Color development unit
		Key counter
		Universal Cassette

∙Specifications are Subject to change without notice.

1-2

1 June 1990

2. OPERATION PANEL

— A4/A3 Version —

C B A

— LT/LDG Version —

C B A

Section A:	See page	7.
Section B:	See page	8.
Section C:	See page 10.

1-3

1 June 1990

Section A —

— A4/A3 Version —

— LT/LDG Version —

1		2	3		1		2	3

4		4

5		5

7

6

7

6

1. Number Keys

The number keys are used to enter the desired number of copies. They are also used to input the sizes of the original and the copy image when in size magnification mode.

2. Recall/Enter Key

Press to display the number of copies entered. Also use to enter or change data when in size magnification mode.

3. Clear Modes Key

Press to clear all previously entered settings and modes.

4. Interrupt Indicator

Lights when interrupt mode is selected.

5. Interrupt Key

Press to make interrupt copies during a copy run.

6. Start Key

Press to start copying.

7. Clear/Stop Key

Press to cancel the copy number entered. While copying, press to stop copying.

1-4

1 June 1990

—Section B —

—A4/A3 Version —

1		2			3		4		5 6				7		8 9 10
																											11
																						12
1																											13
																										14
																									15
23		22			21		20 19						18		17							16

1.Magnification Ratio Indicator

Shows the selected reproduction ratio and data for the Size Magnification mode.

2.Check Paper Size Indicator

Lights when improper paper size is selected in the book original mode or the duplex mode. (Copying is impossible.)

3.Check Paper Size/Direction Indicator

Blinks when the original size does not match with the paper size or direction. This indicator is functional only with the document feeder. (Copying is possible.)

4.Auto Paper Select Indicator

Lights when auto paper select mode is selected. This mode is an optional feature with the document feeder.

5.Duplex Unit Indicator

Lights when the duplex unit is installed.

6. Load Paper Indicator

Lights when the cassette or the paper tray in use runs out of paper.

7. Add Toner Indicator

Blinks when it is time to change the toner cartridge. When it is continuously lit, the copier cannot be used until a new cartridge is installed.

8.Check Paper Path Indicator

Lights if there is a misfeed within the machine.

9.Manual Feed Indicator

Lights when the manual feed table is open.

10.Second Original Indicator

Lights when it is time to position the second original on the exposure glass when making duplex copies.

— Light ON —

If copying has been completed, press duplex key to cancel the duplex mode and press start key to eject copies.

— Light Blinking —

Press start key to eject copies.

11. Ready Indicator

Lights when the machine is ready to make copies.

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1 June 1990

— LT/LDG Version —

1		2	3		4		5 6					7		8 9 10
																											11
														12
24																											13
																											14
																										15

23

22

21

20 19 18

17

16

12. Wait Indicator

Lights when that the machine is not ready to copy.

13. Copy Counter

Displays the number of copies entered. While copying, it shows the number of copies made.

14.Auto Image Density Indicator

Lights when the copier is automatically controlling image density. If this indicator blinks, refer to page 55.

15.Manual Image Density Indicator

Shows the manually selected image density. If this indicator blinks, refer to page 55.

16.Auto Image Density Key

Press to select/cancel the automatic image density mode.

17.Manual Image Density Keys

Use to cancel the automatic image density mode and manually select the image density level.

18.Misfeed Location Display

Shows the location(s) of misfed paper.

19.Color Copy Indicator

Lights if a color toner development unit is installed.

20. Select Paper Key

Press to select the cassette or the paper tray for paper feed, or press to cancel auto paper selection mode when the document feeder is installed.

21. Full Size Key

Press to make copies the same size as the originals.

22. Enlarge Key

Press to make enlarged copies.

23. Reduce Key

Press to make reduced copies.

24. Paper Size Indicator

Shows the size and direction of the paper in use.

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1 June 1990

—Section C —

—A4/A3 Version —

5

4

6

7

3																		8
2
																	9
												10
1				13			12		11

1. Sorter Key

Press to select the sort or stack mode. The sort mode and stack mode are optional features requiring a sorter.

2. Stack Indicator

Lights when in the stack mode.

3. Sort Indicator

Lights when in the sort mode.

4. Duplex Key

Press to select one of three duplex modes. These modes are optional features requiring a duplex unit.

5. Duplex Indicators

Show which duplex copying mode is selected.

6. Auto Reduce/Enlarge Indicator

Lights when in the auto reduce/enlarge mode. This mode is an optional feature requiring a document feeder.

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1 June 1990

— LT/LDG Version —

5

4

6

7

3																	8
2
																	9

1

13

12

11

10

7.Auto Reduce/Enlarge Key

Press to select the auto reduce/enlarge mode. This mode is an optional feature requiring a document feeder.

8.Zoom Up Key

Press to increase the reproduction ratio in 1% steps.

9.Zoom Down Key

Press to reduce the reproduction ratio in 1% steps.

10.Size Magnification Key

Press to select the size magnification mode.

11.Size Magnification Indicators

Lights when in the size magnification mode; shows when to enter the original size and copy size data.

12.2 Single Copies Key

Press to select one of two 2 single copies modes. The 2 Sided Original mode is an optional feature requiring a document feeder.

13. 2 Single Copies Indicators

Show which the 2 single copies mode is selected.

1-8

1 June 1990

1-9

1 June 1990

3.COPY PROCESSES AROUND THE DRUM

2.EXPOSURE

1.DRUM CHARGE

3. ERASE

9. QUENCHING

4. DEVELOPMENT

8. CLEANING

5. PRE-TRANSFER LAMP (PTL)

	7. PAPER	6. IMAGE TRANSFER
	SEPARATION

1-10

1 June 1990

1. DRUM CHARGE

In the dark, the charge corona unit gives a uniform negative charge to the organic photoconductive (OPC) drum. The charge remains on the surface of the drum because the OPC drum has a high electrical resistance in the dark.

2. EXPOSURE

An image of the original is reflected to the OPC drum surface via the optics assembly. The charge on the drum surface is dissipated in direct proportion to the intensity of the reflected light, thus producing an electrical latent image on the drum surface.

3. ERASE

The erase lamp illuminates the areas of the charged drum surface that will not be used for the copy image. The resistance of the drum in the illuminated areas drops and the charge on those areas dissipates.

4. DEVELOPMENT

Positively charged toner is attracted to the negatively charged areas of the drum, thus developing the latent image. (The positive triboelectric charge is caused by friction between the carrier and toner particles.)

5. PRE-TRANSFER LAMP (PTL)

The PTL illuminates the drum to remove all negative charge from the exposed areas of the drum. This prevents the toner particles from being reattracted to the drum surface during paper separation and makes paper separation easier.

6. IMAGE TRANSFER

Paper is fed to the drum surface at the proper time so as to align the copy paper and the developed image on the drum surface. Then, a strong negative charge is applied to the back side of the copy paper, producing an electrical force which pulls the toner particles from the drum surface to the copy paper. At the same time, the copy paper is electrically attracted to the drum surface.

7. PAPER SEPARATION

A strong ac corona discharge is applied to the back side of the copy paper, reducing the negative charge on the copy paper and breaking the electrical attraction between the paper and the drum. Then, the stiffness of the copy paper causes it to separate from the drum surface. The pick-off pawls help to separate paper.

8. CLEANING

The cleaning brush removes most of the toner on the drum and loosens the remainder. Then the cleaning blade scrapes off the loosened toner.

9. QUENCHING

Light from the quenching lamp electrically neutralizes the surface of the drum.

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1 June 1990

4. FUNCTIONAL OPERATION

1-12

1 June 1990

5. MECHANICAL COMPONENT LAYOUT

1	2	3	4	5		6	7	8		9	10	11	12	13	14
															15
															16
33															17
32															18
31
30
															19
		29	28	27	26	25	24	23	22	21	20

1.	Third Mirror	19.	Separation Roller
2.	Second Mirror	20.	Relay Rollers
3.	First Mirror	21.	Semi-circular Feed Rollers
4.	Exposure Lamp	22.	Registration Rollers
5.	Ozone Filter	23.	Pre-transfer Lamp (PTL)
6.	Cleaning Unit	24.	Transfer and Separation Corona
7.	Lens		Unit
8.	Quenching Lamp (QL)	25.	Pick-off Pawls
9.	Charge Corona Unit	26.	Cleaning Brush
10.	Sixth Mirror	27.	Cleaning Blade
11.	Erase lamp (EL)	28.	Pressure Roller
12.	OPC Drum	29.	Hot Roller
13.	Development Unit	30.	Duplex Turn Guide (Option)
14.	Toner Supply Unit	31.	Exit Rollers
15.	Optics Cooling Fans	32.	Hot Roller Strippers
16.	Feed Roller	33.	Exhaust Blower

17.Manual Feed Table

18.Pick-up Roller

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1 June 1990

6. DRIVE LAYOUT

		G17 BP2 G16				TB1 G19 G18 G22	G23	G24
G5
G6								G26
G7								G27
G9
G8								G28
G10
G4
BP3
G13 G12 G11 G14 G15 BP1G3 G2						G1 G20 G21	G25	G29

G1: Main Motor Gear

G20: Relay Gear

G2: Relay Gear

G18: Relay Gear

G21: Cleaning Drive

Cleaning Unit

G3: Timing Belt Drive Gear

G19: Drum Drive Gear

G22: Relay Gear

BP1: Timing Belt Pulley

Drum

Fusing and Exit Section

TB1: Timing Belt

Development

G23: Relay Gear

Section

G24: Relay Gear

A

BP2: Timing Belt

G25: Hot Roller Gear

Pulley

G26: Relay Gear

G16: Development

G27: Relay Gear

G29: Duplex Transp

CL Gear

Gear (Option)

G28: Exit Roller Gear

Development CL

Development Unit

G17: Toner Supply CL Gear

Toner Supply CL

Toner Supply Unit

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1 June 1990

A

Paper Feed Section

BP3: Timing Belt Pulley

G11: Registration CL Gear

G4: Relay Gear

2nd Feed Station

Registration CL

G5: Relay Gear

G12: Relay Roller

CL Gear

Registration Roller

G6: 1st Paper Feed CL Gear

Relay Roller CL

1st Paper Feed CL

1st Paper Feed CL

G7: Relay Gear

Relay Roller

G13: Relay Roller Gear

1st Paper Feed Rollers

G8: Paper Lift CL Gear

G14: Relay Gear

G15: 2nd Paper Feed

Paper Lift CL

CL Gea

G9: Paper Lift Gear

2nd Paper Feed CL

G10: Sector Gear

2nd Paper Feed Roller

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1 June 1990

7. ELECTRICAL COMPONENT LAYOUT

					2
			4	1		3	5
			43				6
		42					7				10
							8
											9
	40										13
	39										11
											12
											15
											16
	41										14
											17
	32										18
	38										19
	36										20
	37										2221
	34	35	31						25		24
									27	23
			30	33
							29 26
				28
1.	Scanner H.P. Sensor				22.	Relay Roller CL Sol.
2.	Lens Motor				23.	Right Cover SW
3.	Lens H.P. Sensor				24.	Registration Clutch
4.	Exit Sensor				25.	2nd Paper Feed CL Sol.
5.	Scanner Motor				26.	1st Paper Size SW
6.	2nd Paper Size SW-1 (SW4)				27.	1st Paper End Sensor
7.	2nd Paper Size SW-2 (SW5)				28.	2nd Paper End Sensor
8.	2nd Paper Size SW-3 (SW6)				29.	Cassette Lift Sensor
9.	2nd Paper Size SW-4 (SW7)				30.	Registration Sensor
10.	Main Motor				31.	Pre-transfer Lamp (PTL)
11.	Development CL Sol.				32.	ID Sensor
12.	4th/5th Mirror H.P. Sensor				33.	Total Counter
13.	Toner Supply CL Sol.				34.	Erase Lamp (EL)
14.	Toner End Sensor				35.	Transfer and Separation Corona Unit
15.	4th/5th Mirror Motor				36.	Charge Corona Unit
16.	Pick-up Roller Release Sol.				37.	Fusing Lamp
17.	Manual Feed Table SW				38.	Quenching Lamp (QL)
18.	Development Unit Set Sensor				39.	Auto ID Sensor
19.	Color Switch				40.	Toner Overflow Sensor
20.	Paper Lift CL Sol.				41.	Fusing Thermistor
21.	1st Paper Feed CL Sol.				42.	Fusing Thermofuse
					43.	Tray Lock Sol.

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1 June 1990

	49
	50
	48
	51
	47
	52
	46
45	53
44

	62				54
	61
					55
	60
					56
	59
	58				57
44.	Key Counter (Option)			54.	Drum Anti-condensation Heater
45.	Main Board			55.	Main DC Power Supply Board
46.	CC/Grid/Bias Power Pack			56.	Optional DC Power Supply Board
47.	Optics Cooling Fan Motors				(Option)
48.	Optics Thermoswitch			57.	Optional Transformer (Option)
49.	Exposure Lamp			58.	Main Transformer
50.	Operation Panel Board			59.	AC Drive Board
51.	Exhaust Blower Motor			60.	Main Motor Capacitor
52.	Cover Safety SW			61.	TC/SC Power Pack
53.	Main SW			62.	Interface Board (Option)

1-17

1 June 1990

8. ELECTRICAL COMPONENT DESCRIPTIONS

SYMBOL	NAME	FUNCTION	INDEX
Motors			NO.
M1	Main Motor	Drives all the main unit components except	10
		for the optics unit and fans.
		(115/220/240Vac)
M2	Scanner Motor	Drives the scanners (1st and 2nd). (dc	5
		stepper)
M3	Lens Motor	Moves the lens position according to the	2
		selected magnification. (dc stepper)
M4	4th/5th Mirror Mo-	Move the 4th/5th mirror position according	15
	tor	to the selected magnification. (dc stepper)
M5	Optics Cooling	Prevents built up of hot air in the optics	47
	Fan Motor-1	cavity. (24 Vdc)
M6	Optics Cooling	Prevents built up of hot air in the optics	47
	Fan Motor-2	cavity. (24 Vdc)
M7	Exhaust Blower	Removes heat from around the fusing unit	51
	Motor	and blower the ozone built up around the
		charge section to the ozone filter.
Magnetic Clutch
MC1	Registration	Drives the registration roller.	24
	Clutch
Solenoid
SOL1	Toner Supply	Drives the toner supply roller via the toner	13
	Clutch Solenoid	supply spring clutch.
SOL2	1st Paper Feed	Starts paper feed from the first paper	21
	Clutch Solenoid	station.
SOL3	2nd Paper Feed	Starts paper feed from the 2nd paper	25
	Clutch Solenoid	station.
SOL4	Pick-up Roller	a) After the paper is fed, releases the	16
	Release Solenoid	pick-up roller from next paper. b) When the
		manual feed table is used, releases the
		pick-up roller from the table.
SOL5	Paper Lift Clutch	Lifts paper to the appropriate feed position.	20
	Solenoid
SOL6	Tray Lock Sole-	Locks the paper tray/duplex unit.	43
	noid
SOL7	Development	Drives the development unit.	11
	Clutch Solenoid
SOL8	Relay Roller	Drives the relay roller for the 2nd cassette	22
	Clutch Solenoid	station.

1-18

SYMBOL	NAME	FUNCTION
Switches
SW1	Main Switch	Supplies power to the copier.
SW2	Cover Safety	Cuts the ac power line.
	Switch
SW3	1st Paper Size	Determines what size paper is in the first
	Switch	cassette.
SW4	2nd Paper Size	Determines what size paper is in the paper
	Switch-1	tray.
SW5	2nd Paper Size	Determines what size paper is in the paper
	Switch-2	tray.
SW6	2nd Paper Size	Determines what size paper is in the paper
	Switch-3	tray.
SW7	2nd Paper Size	Determines what size paper is in the paper
	Switch-4	tray.
SW8	Color Switch	Determines which color development unit is
		installed.
SW9	Manual Feed Ta-	Detects when the manual feed table is
	ble Switch	open.
SW10	Right Cover	Detects when the right cover is open.
	Switch
Sensor
S1	Scanner Home	Informs the CPU when the 1st scanner is at
	Position Sensor	the home position.
S2	Lens Home	Informs the CPU when the lens is at the
	Position Sensor	home position (full size position).
S3	4th/5th Mirror	Informs the CPU when the 3rd scanner
	Home Position	(4th/5th mirrors assembly) is at the home
	Sensor	position (full size position).
S4	Registration	Detects misfeeds.
	Sensor
S5	Exit Sensor	Detects misfeeds.
S6	1st Paper End	Informs CPU when the first cassette runs
	Sensor	out of paper.
S7	2nd Paper End	Informs CPU when the paper tray runs out
	Sensor	of paper.
S8	Toner End	Detects when it is time to add toner.
	Sensor
S9	Toner Overflow	Detects when the used toner tank is full.
	Sensor
S10	Paper Lift	Detects the correct feed height of the
	Sensor	cassette.

1 June 1990

INDEX

NO.

53

52

26

6

7

8

9

19

17

23

1

3

12

30

4

27

28

18

40

29

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1 June 1990
SYMBOL	NAME	FUNCTION	INDEX
			NO.
S11	Image Density	Detects the density of the image on the	32
	(ID) Sensor	drum to control the toner density.
S12	Development	Sensors whether or not the development	18
	Unit Set Sensor	unit is properly set.
Printed Circuit Board
PCB1	Main Board	Controls all copier functions both directly	45
		and through the other PCBs.
PCB2	AC Drive Board	Drives all ac motors, the exposure lamp,	59
		fusing lamp, quenching lamp, exhaust
		blower motor.
PCB3	Main DC Power	Rectifies 26 and 10 Vac input and outputs	55
	Supply Board	dc voltages.
PCB4	Auto Image	Senses the background density of the	39
	Density Sensor	original.
	(ADS)
PCB5	Optional DC	Rectifies 26 and 10 Vac input and outputs	56
	Power Supply	dc voltasges.
	Board
PCB6	Interface Board	Interfaces between the copier main board	62
		and all the optional equipment’s main board.
PCB7	Operation Panel	Informs the CPU of the selected modes	50
	Board	and displays the situations on the panel.
Lamps
L1	Exposure Lamp	Applies high intensity light to the original for	49
		exposure.
L2	Fusing Lamp	Provides heat to the hot roller.	37
L3	Quenching Lamp	Neutralizes any charge remaining on the	38
		drum surface after cleaning.
L4	Erase Lamp	Discharge the drum outside of the image	34
		area. Provides leading/trailing edge erase.
L5	Pre-transfer	Reduces charge on the drum surface	31
	Lamp	before transfer.
Power Packs
P1	CC/Grid/Bias	Provides high voltage for the charge	46
	Power Pack	corona, grid, and the development roller
		bias.
P2	TC/SC Power	Provides high voltage for the transfer and	61
	Pack	separation corona.

1-20

			1 June 1990
SYMBOL	NAME	FUNCTION	INDEX
Heaters			NO.
H1	Drum Anti-	Prevents moisture around the drum.	54
	condensation
	Heater
H2	Optics Anti-con-	Prevents moisture from forming on the	N/A
	densation Heater	optics.
	Option
Counters
CO1	Total Counter	Keeps track of the total number of copies	33
		made.
CO2	Key Counter	Used for control of authorized use. Copier	44
	(Option)	will not operate until installed.
Transformer
TR1	Main Transformer	Steps down the wall voltage to 26 Vac and	58
		10 Vac.
TR2	Optional	Steps down the wall voltage to 26 Vac and	57
	Transformer	10 Vac for the document feeder and duplex
		unit.
Others
TH	Fusing	Monitors the fusing temperature.	41
	Thermistor
TF	Fusing	Provides back-up overheat protection in the	42
	Thermofuse	fusing unit.
TS	Optics	Provides back-up overheat protection	48
	Thermoswitch	around the exposure lamp.
C	Main Motor Ca-	Start capacitor	60
	pacitor

1-21

1 June 1990

9. OVERALL MACHINE CONTROL

AC Power (115V or 220/240V)

Cover Safety Switch

Anti-condensation Heater

Main Switch

-Drum

-Optics

Operation

Panel Board

Sensors/Switches/Thermistor

IC 123

Image Density Sensor

AC Drive Board

CPU

Registration Sensor

Cassette Lift Sensor

Exit Sensor

Exhaust Blower Motor (L)

Power Relay

IC 105

Auto ID Sensor

Scanner HP Sensor

I/O

Fusing Lamp

Lens HP Sensor

Fusing Lamp

Drive Circuit

4th/5th Mirror HP Sensor

IC 124

Toner Overflow Sensor

Exposure Lamp

Toner End Sensor

Exposure Lamp

Drive Circuit

I/O

Color Switch

Main Motor

1st/2nd Paper Size Switches

Quenching Lamp

Main Motor Relay

IC 111

1st/2nd Paper End Sensors

Right Cover Switch

Exhaust Blower Motor (H)

ROM

Manual Feed Table Switch

Fusing Thermistor

	Power Packs		Solenoids/Clutches
	CC/Grid/Bias P.P.
		Main Board	Pick-up Roller Release Sol.
	Charge Corona		Cassette Lift CL Sol.
	Grid Voltage		1st/2nd Paper Feed CL Sol.
			Relay Roller CL Sol.
	Dev. Bias
			Registration Clutch
		RAM	Tray Lock Sol.
	TC/SC P.P.		Development Drive CL Sol.
		Board
			Toner Supply CL Sol.

Counters		Motors
		Scanner Motor
	Total Counter	Lens Motor
		4th/5th Mirror
	Key Counter	Optics Cooling Fan Motor

	ARDF	Serial		NOTE: The interface board is
			Interface	connected to the copier main
	Duplex	Serial
			Board	board when the ARDF, duplex
	Sorter
				unit and/or sorter is installed.

The above diagram shows the control system of this copier in block form. The CPU (IC123) on the main board controls the timing of all copier’s operation based on the CPU’s internal clock. The CPU monitors the input signals from all sensors and controls the dc components directly or through two I/O chips (IC 105 and IC 124). It also controls ac components such as the fusing lamp, exposure lamp, main motor quenching lamp, and exhaust blower motor (High speed) directly via the ac drive board. The exhaust blower motor (Low speed) is controlled via the I/O chip (IC 124) and ac drive board. The charge corona, grid voltage and development bias are powered by the same power pack (P1) but are controlled separately as shown above. The main board has a

RAM board for the service program mode and misfeed recovery. A battery backs up the power to the RAM board.

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1 June 1990

10. AC POWER AND DC POWER

DISTRIBUTION

AC Power (115V or 220/240V)

Main SW

Anti-condensation Heater

-Drum

-Optics (Option)

Cover Safety SW

	Fuse				Scan	Operation Panel Board
					Signal
	Power Relay			24V (VA)	5V (VC)		Sensors
							Switches
Exhaust Blower		(RA401)					Interface Board
Motor (L)
	Fusing Lamp			24V (VA)			Solenoids
		Drive Circuit					Clutches
Fusing Lamp				RAM	24V (VA)		Power Packs
				PCB			Lens Motor
	Exposure Lamp			24V (VA)			4th/5th Mirror Motor
		Drive Circuit					Optics Cooling Fan
Exposure Lamp							Motors
				24V (VA)	30V (VM)
	Main Motor						Scanner Motor
Main Motor	Relay (RA402)			Main
Quenching Lamp				Board
Exhaust Blower
Motor (H)	AC Drive Board
Optional Transformer
26V AC 10V AC
FU100 (5V)	Main Transformer			Interface
FU101 (24V)
				Board
Optional
	10V AC	26V AC	26V AC
DC Power Supply				30V (VM)
Board	Main DC Power Supply Board			24V (VA)

24V

5V

24V

5V

5V (VC)

(VA) (VC)

(VA) (VC)

FU100 (5V)

ac power

FU101 (24V)

Zero

FU102 (30V)

dc power

ARDF

Duplex

Cross

24V (VA)

Sorter

5V (VC)

When this copier is plugged in and the main switch is turned off, ac power is supplied via the ac drive board to the anti-condensation heater. When the front cover and/or the exit cover is open, the cover safety switch completely cuts off power to all ac and dc components. The RAM board has a back up power supply (dc battery) for the service program mode and misfeed job recovery.

When the main switch is turned on, the ac power supply to the anti-condensation heater is cut off and ac power is supplied to the ac drive board. The main transformer receives wall outlet ac power through the ac drive board and outputs 10 volts ac and 26 volts ac to the main dc power supply board.

1-23

1 June 1990

The main dc power supply board converts the 10 volts ac input to +5 volts and a zero cross signal. There are two 26 volts ac inputs. The dc power supply board converts them to +24 volts and +30 volts.

The +5 volts and +24 volts are supplied to both the copier main board and the sorter main board. The zero cross signal and +30 volts are supplied to the copier main board.

The copier main board supplies dc powers to all copier dc components. All sensors, and switches plus the interface board operate on +5 volts. The scanner motor operates on +30 volts. All other dc components including the power relay (RA401) and the main motor relay (RA402) operate on +24 volts. The ARDF and the duplex unit have a separate dc power supply.

When the main board receives power, it activates the power relay (RA401) which then supplies ac power to the fusing lamp drive circuit, and the exposure lamp drive circuit on the ac drive board. The exhaust blower motor begins rotating at low speed. The fusing lamp drive circuit receives a trigger signal from the main board and the fusing lamp lights. The exposure lamp does not turn on until the main board send a trigger pulse to the exposure lamp drive circuit.

When the Start key is pressed, the main board energizes the main motor relay (RA402). Then, the main motor and the quenching lamp turn on and the exhaust blower starts rotating at high speed.

When the main switch is turned off, power is cut off to the main board and to RA401, and the drum and optional anticondensation heaters are turned on. The exposure lamp and the fusing lamp power lines are completely disconnected from the line voltage.

1-24

1 June 1990

10.1 AC POWER DISTRIBUTION

Main SW

(SW1)

			T403	T402	T401
115V			T404		CN411-1
220/240V		Cover	Fuse	RA402-1
		Safety
		SW (SW2)
			T407		CN411-2
					Drum
To DF and Duplex					Anti-condensation
	Optional				Heater (H1)
[24] VA	DC Power 10V AC TR2		CN418-1
[5] VC	Supply
[0] GND	Board		CN418-3
	(PCB5)	26V AC	CN417-3	RA402-2 CN420-3
To Sorter			CN417-1		CN420-2
[24] VA		CN103-1			Exhaust Blower Motor
					CN419-1
[5] VC		CN103-2
			RA401		Exposure Lamp
[0] GND		CN103-3
					T405

TR1	CN100-1			Fusing	H	L
	CN100-2	26V AC		Lamp
	CN100-3	26V AC	AC	Thermo-		M
	CN100-4		Drive	switch		(M7)
	CN100-5
				(TS)
	CN100-6	10V AC	Board
				Thermo-

			DC	(PCB2)	fuse
ZERO	CN108-1	CN102-2			169oC
CROSS			Power		(TF)
	CN108-2	CN102-1
			Supply
[0] GND	CN107-1	CN101-1
[0] GND			Board	Noise Filter
[30] GND	CN107-2	CN101-2 (PCB3)		Circuit	(L2) (L1)
[0] GND	CN107-3	CN101-3		(220/240V
	CN107-4	CN101-4			CN413-1
[24] VA				Only)
	CN107-5	CN101-5			Main
[0] GND
	CN107-6	CN101-6			Motor (M1)
[5] VC

	Main			Exposure		CN415-1
		CN122-7	CN401-8
				Lamp Drive		M
	Board	CN122-6	CN401-9
				Circuit	CN421
	(PCB1)	CN122-10	CN401-5		(220/240V
					Only)
			CN401-1	Fusing		Quench-
		CN122-14				ing
				Lamp Drive
		CN122-9	CN401-6			Lamp
				Circuit
						(L3)
						CN415-2
						CN413-2
						T406
						CN419-2
		CN122-13	CN401-2	Power Relay		CN420-1
		CN122-12	CN401-3	RA401
		CN122-11	CN401-4
				RA402
				Main Motor Relay

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1 June 1990

10.2 DC POWER DISTRIBUTION

DC Power Supply Board

Main Board

CN417

CN100

FU100

R100

Q100

CN101

CN107

-1

-5

ST100

-6

-6

[5]Vc

D102

D100

R103

CN103

(

To

)

10VAC

IC100

D103

-2

Sorter

ON

+

CN102

CN108

-2

-1

Zero

CN100

+

+

C103

C104

C112

CN103

To

Cross

[24]VA

R101

(

-6

D101

C100

C101

-1

Sorter

)

R102

CN101

CN107

R104

-5

-5

[0]GND

R105

CN102

CN108

R106

C105

Q101

-1

-2

[0]GND

CN100

FU101

CN101

CN107

115V

R107

-3

ST101

Q102

-4

-4

220/240V

[24]VA

[5]VC

D104

26VAC

+

CN103

(

To

)

IC101

C109

D105

C113

-3

Sorter

+

+

C108

CN100

CN101

CN107

-4

C110

C107

-3

-3

[0]GND

CN100

FU102

CN101

CN107

-1

ST102

-2

-2

[30]VM

26VAC

[30]VM

	CN100	+
CN417		C110	R108	C111	C114	CN101	CN107
	-2
-3						-1	-1
							[0]GND

[0]GND

1-26

SECTION 2

SECTIONAL DESCRIPTION

1 June 1990

1. DRUM

1.1 OPC DRUM CHARACTERISTICS

An OPC has the characteristics of:

1.Being able to accept a high negative electrical charge in the dark. (The electrical resistance of a photoconductor is high in the absence of light.)

2.Dissipating the electrical charge when exposed to light. (Exposure to light greatly increases the conductivity of a photoconductor.)

3.Dissipating an amount of charge in direct proportion to the intensity of the light. That is, where stronger light is directed to the photoconductor surface, a smaller voltage remains on the OPC.

4.Being less sensitive to changes in temperature (when compared to selenium F type drums). This makes it unnecessary to monitor and control the drum temperature.

2-1