Ricoh NC8115.015 Service Manual SF

SLIDE PROJECTOR UNIT

Model	A092-17	A092-25	A092-27	A105-17	A105-27
A984-17	O	X	X	O	X
A984-27	X	O	O	X	X
A711-27	X	X	X	X	O

O: The SPU can be connected to the copier.

X:The SPU cannot be connected to the copier due to the safety standard.

5 January 1995 SPECIFICATIONS

1. SPECIFICATIONS

Acceptable Film Type:	35 mm positive and negative film, mounted film or
	strip film (up to six frames per strip)
Warm-up Time:	0 sec.
Copy Speed:	4 cpm/81/2"x11", A4
1st Copy Time:	42 sec. (After pressing the start key)
Magnification Range:	50 to 400% ratios smaller than 50% are not
	available when using the SPU
Focusing:	Fixed focus
Projection Method:	Slit (Horizontal)
Scanning Method:	Moving Film
Projection Ratio:	x 8.73
	NOTE: For 115V/60HZ version, 93% is
	automatically selected on the main frame.
Effective Film Area:	21.5 x 33.0 mm (Full film size 24 x 36 mm)
Copy Image Size:	194 x 288 mm (Centering mode)
	NOTE: Paper must be set lengthwise.
Power Source:	115 V/50, 60 Hz/ 10 A
	220 ~ 240 V/50, 60 Hz/7 A
Power Consumption:	0.25 kw
Dimensions (W x D x H): Projector Unit:
	12.5" x 18.5" x 11.4" (317 x 470 x 289 mm)
	Mirror Unit:
	1.8" x 10.1" x 1.8" (44 x 248 x 44 mm)
Weight:	Projector Unit:	Approx. 28.7 lbs (13.0 kg)
	Mirror Unit:	Approx. 1.1 lbs (0.5 kg)

1

COMPONENT LAYOUT

5 January 1995

2. COMPONENT LAYOUT

Mechanical Components

2	3	4	5	6
1				1. Film Holder

72. Light Compensation Filter

3.Condenser Lens

4.Heat Filter

85. Nonspherical Lens

6.Light Compensation Filter Motor

7.Halogen Lamp

	14		8.	Reflector
			9.	Film Scanning Motor
			10.	Color Compensation Filter Motor
			11.	Color Compensation Filter
	13	9	12.	Film Scanning Belt
			13.	Diaphragm
	12 11	10	14.	Projection Lens
	Electrical Components
	3	4
		5	1.	Film Scan H.P. Sensor
	2
	1	6	2.	Mount Holder Set Sensor
			3.	Light Compensation Filter H.P.
			4.	Light Compensation Filter Motor
	16		5. Main PCB
	15		6.	PSU Outlet Fan
			7.	PSU (Power Supply Unit)
	14
			8.	Film Scanning Motor
	13
			9.	Halogen Lamp
		7	10.	Lamp Inlet Fan
		8	11.	Safety Switch
		9	12.	Color Compensation Filter Motor
	12 11	10	13.	Color Compensation Filter H.P.
				Sensor
			14.	Thermo Fuse
			15.	Lens Cover Sensor
			16.	Film Strip Holder Set Sensor

2

5 January 1995 ELECTRICAL COMPONENT DESCRIPTIONS

3. ELECTRICAL COMPONENT DESCRIPTIONS

Symbol	Name	Function	Location
Motors
M1	Light Compensation	Stepping motor to move the light	4
	Filter Motor	compensation filter up and down.
M2	PSU Outlet Fan	Cools the PSU.	6
M3	Film Scanning Motor	Stepping Motor to move the film for	8
		scanning.
M4	Lamp Inlet Fan	Provides a flow of air to the halogen lamp to	10
		cool it.
M5	Color Compensation	Stepping Motor to turn the color	12
	Filter Motor	compensation filter.
Switches
SW1	Safety Switch	Cuts DC 15 V current of the halogen lamp	11
		when the lamp cover is opened.
Sensors
S1	Film Scan H.P. Sensor	Notifies the CPU when the film is at the	1
		home position.
S2	Mount Holder Set	Notifies the CPU when the mount holder is	2
	Sensor	set.
S3	Light Compensation	Notifies the CPU when the light	3
	Filter H.P. Sensor	compensation filter is at the home position.
	Color Compensation	Notifies the CPU when the color
S4	Filter H.P. Sensor	compensation filter H.P. sensor is at the	13
		home position.
S5	Lens Cover Sensor	Notifies the CPU whether the lens cover is	15
		open or closed.
S6	Film Strip Holder Set	Notifies the CPU when the film strip holder	16
	Sensor	is set.
PCBs
PCB1	Main PCB	Controls the slide projector unit’s function	5
		and communicates with the copier.
PCB2	PSU	Provides DC 15 V, 5 V, 12 V, and 24 V	7
		current.
Lamp
L1	Halogen Lamp	Supplies high intensity light to the film for	9
		exposure.
Others
TF	Thermofuse	Opens the 15 V line if the halogen lamp	14
		overheats.

3

BASIC OPERATION

5 January 1995

4. BASIC OPERATION

4.1 SUMMARY

		[F]	[D]	[B]
		[H]
	[I]			[A]
[J]				[C]
				[E]
				[G]
		[K]
[M]		[L]

The light of the halogen lamp (150 W, 15 V) [A] is reflected by the reflector [B] and it goes through the nonspherical lens [C], the heat filter [D], the condenser lens [E], the light compensation filter [F], the color compensation filter [G], and the film [H].

The heat filter cuts off heat from the halogen lamp and prevents the film from deforming.

The light goes through the projection lens [I], it is reflected 90° by the mirror

[J] and goes through the frosted glass (upper layer: fresnel lens, lower layer: diffused surface) [K] and the optical fiber array [L] to the full color CCD [M] located on the copier’s scanner unit.

NOTE: Film mounts with protective glass or filters can not be used. These are too thick to let the slide mount holder close properly, resulting in a poorly focused image. In this case, take the film out of the mount with film protection glasses and set it to a normal mount for copying.

4

5 January 1995

BASIC OPERATION

4.2 FILM COLOR CORRECTION

[C]

[A]	[B]

[D]

[E]

The RGB Gamma characteristics are different between positive film and negative film. The color compensation filters are used to compensate the

RGB Gamma characteristics of each film.

There are 3 windows on the disk. One is the filter [A] for positive film, one is the filter [B] for negative film, the other is no filter [C] for detecting initial condition, or for SPU focus adjustment (SP92).

Home position is detected by the color compensation filter H.P. sensor [D].

The color compensation filter is rotated by the color compensation filter motor [E].

5

BASIC OPERATION 5 January 1995

4.3 FILM SCANNING

[D]		Magnification	Speed
		50%	17.17 mm/sec
		100%	8.59 mm/sec
		200%	4.29 mm/sec
	[A]	300%	2.86 mm/sec
		400%	2.15 mm/sec

[C][B]

The film is scanned by being moved.

The scanner of the copier stays at 45 mm left of its home position. The film is moved down 50 mm (the length of film is 35 mm) at a specified speed. See the table above.

The film scan motor [A] moves the film up and down. The drive is transferred through the coupling [B], worm gear [C], and film scan belt [D].

When 100% magnification is selected from the operation panel, the 35 mm film image is actually enlarged 873% on the copy.

For other magnification ratios, film scanning speed controls magnification in the paper feeding direction, while image processing controls magnification in the main scan direction.

Concerning leading edge registration and side to side registration, they will be easily changed between each copy or each original due to its reproduction ration (1 : 8.73). If the scanning is delayed 0.5mm, the image is shifted about 4 mm to the trailing edge.

For 115V/60Hz models, 93% reproduction ratio is automatically selected to accommodate 81/2" x 11" paper. 11" (279 mm) is too short to select 100%.

The Effective film area is 21.5 x 33 mm.

∙Copy image on A4 lengthwise paper (210 x 297 mm):

21.5x 8.73 = 187.7 mm 33 x 8.73 = 288.1 mm

∙Copy image on 81/2" x 11" lengthwise paper (216 x 279):

187.7x 0.93 = 174.6 mm

288.1x 0.93 = 268.0 mm

6

5 January 1995

BASIC OPERATION

4.4 SHADING

[A]

100%

Light

[A]

50%

30%

Dark

0%

Shading corrects the following variations of the video data.

∙Variations in sensitivity between bits of the CCD (arising from production processes).

∙Variations in characteristics of the color compensation filter, light compensation filter, mirror unit, lenses, and optical fiber array unit in the copier.

∙Loss of brightness at both front and rear ends of the exposure on the CCD.

∙Variations in characteristics of the negative film

Negative film:

Color negative film comes in many kinds. A negative is a photo image laid on a transparent strip of plastic (called a base). All emulsions are to some extent similar, but most bases are different. The bases will affect color balance, but the effect is corrected by the shading function.

Positive films:

Positive films have more or less identical bases. So, the film base does not affect shading.

7

BASIC OPERATION

5 January 1995

Before scanning the original film, the shading function must be performed.

Set the base film (negative film mode) or no film (positive film mode) in the film holder and press the shading key. The film holder goes down and stops in position for scanning of its the center area. The machine reads it as it would a white reference board.

In this case, the light compensation filter [A] goes down to expose the 30% density area of its filter. (100%: Clear, 0%: Pure black) See the previous page. The maximum data is compared with the data in of the Video Processing Board. If the data is lower (darker) than the data in this board, the light compensation filter will be moved to expose the lighter area. If the data is higher (brighter) than the data in the board, the filter will be moved to expose the darker area. The appropriate color compensation filter is selected.

For the next step, the machine scans 16 lines while the film is going up. The Video Processing Board averages the 16 lines pixel by pixel for one main scan, and the calculated data is stored in that board. This is the white wave form data, which is used to correct the distortion of the video signal. See page 2-29 of the PDC-1E service manual.

NOTE: If the mirror unit on the exposure glass suffers any vibration after shading, vertical lines will appear on the copy image due to improper shading data of each picture element of the CCD.

To prevent or minimize these lines, do the following;

1)Fix the machine on the floor using four leveling shoes.

2)Advise the operator to take care against vibrations to the copier after shading.

3)Reset the mirror unit and perform shading again.

However, in negative mode, vertical lines in low tone areas are normal, and it is not possible to eliminate them completely. In positive mode, these lines will be reproduced in high tone areas on the copy.

8

5 January 1995

BASIC OPERATION

4.5 AUTO IMAGE DENSITY

Trailing edge

Film movement

35 mm

Leading edge

:Scanning area

:Pre-scanning area

After shading, the original film [A] is pre-scanned to detect the brightest point. The pre-scanning area is smaller than the scanning area.

Exposure area: 35 mm x 24.0 mm

Pre-scanning area: 31 mm x 20.2 mm

Scanning area: 33 mm x 22.2 mm

Based on the data from the brightest point, the light compensation filter position is re-adjusted. This prescanning is performed just before copying.

9

BASIC OPERATION

5 January 1995

4.6 MIRROR UNIT

Light

[A]

[B]

Shadow

The mirror unit consists of the mirror, and the frosted glass (upper layer: fresnel lens, lower layer: diffused surface). See the summary.

The fresnel lens [A] changes the reflected image light path to parallel, and the frosted glass [B] clears the shadow from the fresnel lens.

The image is formed on the frosted glass, which is in contact with the copier’s exposure glass. The image is then seen by the optical fiber array.

10