L-W 224-A User manual

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'l
224-A
.....
··.SERVICE MANUAL
.......
L·W PHOTO, INC.
15451 CABRITO RD.
YANNUH
1
~ . CALl F.ORNIA_91406 __ -----'
(C) by LW / Kodak
download from : www.olafs-16mm-kino.de

OPERATION, SERVICE AND ILLUSTRATED
PARTS LIST FOR L-W 224A PROJECTOR.
Aperture plate-----------------------------------~-------------- 14
Bell - Drlve
6
Changing---------------------~-------------------- 9
Br~~eAssy----------------------------------------------------- 10,11,15
Cam - Film Transport-------------------------------------------- 16
Circuit Description---------------------------------------------- 6
Claw Magnet--------------------------------------------------- 10,11,17
Clutch - Sprocket Drive------------------------------------------ 11,13,20
Dismantling Projector-------------------------------------------- 8 - 10
Frame Counter-------------------------------------------------- 14
General Specifications------------------------------------------- 1
Lamps--------------------------------------------------------- 4
Lubrication----------------------------------------------------- 21
Magnetic Pick - up----------------------------------------------..; 11,17
Main Shaft Assy------------------------------------------ ------- 10,11
Maintenance---------------------------------------------------- 8
Mechanical Operating Principles----------------------------------- 5
Operating Instructions-------------------------------------------- 2,3
Parts Illustrations---------------------------------------------- 25 - on
PowerPanel--------------------------------------------------- 8,18,19
Rear Cam - timing---------------------------------------------- 13
(C) by LW / Kodak
download from : www.olafs-16mm-kino.de

Schematic-----------------------------------------------------
Shutter Carrler-------------------------------------------------
Technical Specifications-----------------------------------------
Timing Drum----------------------------------------------------
Trouble Shooting-------~-----------------------------------------
7
9,11,16
22
8,13,20
23,24
(C) by LW / Kodak
download from : www.olafs-16mm-kino.de

1. GENERAL SPECIFICATIONS.
1. 1. ELECTRICAL.
Power source: 105-120 volts AC. 50-60 cycle.
Power consumed: 1250 watts using I, 000 watt lamp.
The drive and fan motors are AC operated, the ' projector control circuit
is a 28 volt DC system supplied from a s elf contained internal source.
A neon lamp indicator is provided to show when the projector is
connected to the AC line.
1. 2. MECHANICAL.
The L-W Photo Opttca l Data Analyzer is a dual purpose instrument.
It may be used as a normal 16mm motion picture projector or as a stop
motion analytical instrument for close scrutiny of 16mm film.
When used in the latter mode the functions available are as follows:
1. STOP.
SINGLE FRAME
2. AUTOMATIC SPEEDS
1,2,4,6,8,12, FPS
3. CINE, 16 &24 FPS
All functions are available in forward and reverse direction.
REEL CAPACITY.
Reel capacity is 400 ft. Another model projector is available with
2, 000 ft. film capacity.
LIGHT LEVEL.
The light level of the projected image remains the same at all modes
of operation even when the film is held indefinately on one frame.
COOLING.
A separate motor driving a centrifugal blower supplies cool air to
the projection lamp and film at all times.
1. 3. OPTICAL.
Lenses from I" through 4" are available to meet almost every need.
1.
(C) by LW / Kodak
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--- A
1:---- 8
O - - ----f
8 - - ---,1
c - - ~
Fig. 1.
Fig. 14
2. 1. SETTING UP P.ROJECTOR FOR USE
Before threading the projector carry out the following operations;
1. Remove front cover and take out empty reel. Open back cover, unwind
power cord and plug into any 115 volt AC outlet.
2. Unfold the two reel arms, raise sprocket clamps B& F. They will be
held open by the click stops, push pressure plate D forwards where
it will be held by spring E.
3. The control box may be used in the 'posi ti on shown in Fig. 1 or
it may be removed by simply pulling downwards and away from
the projector. The remote cable is kept in the back compartment
of the proj ector and is connected between the control box and the
socket on the projector from which the box was removed.
4. Before threading the film the switches on the control box should
be in the correct positions. Fig. 14 shows all the controls in the
right position for threading film. The selector switch A should be
in STOP and the direction switch should be in FWD. The 16-24
selector switch and the frame rate switch D can be in any
position.
5. Film may now be threaded. Follow the threading diagram on the
projector and the illustration Fig .1. Note that the film goes
between the roller C and the sprocket clamp F. Not between the
roller C and the Air Tube. When the film is threaded and attached
to the take up reel press the spring E to release the pressure plate.
2.
(C) by LW / Kodak
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2. 1. cont ,
6. Switch on motor, the top switch on the name plate panel, press
the SINGLE FRAME button on the control box several times until
the film takes up properly through the gate.
7. Switch on lamp, turn switch A Fig. 14 to CINE and run the film.
Focus as required by rotating the lens barrel. Adjust the
picture height on the screen by releasing the elevation control
lever and relock when position is correct. If the frame line is
visible at the top or bottom of the picture turn the knob A WHILE
THE PROJECTOR IS·RUNNING
AT 24 FPS in either direction until
the line is removed. The framing knob will have no effect on
the film if the projector is in the stop position. The projector
is now ready for us e.
2. 2. OPERATION.
The operation is very simple and the functions . on the control
box are almost self explanatory. The control switch A selects
the type of operation, in STOP as shown, the film is stationary
and can be moved one frame in either direction by pressing
the single frame button, only one frame will move no matter
how long it is pressed. When A is turned to CINE the 16-24
switch will control the speed of the film; the single frame
button will now stop the film as long as it is pressed; as soon
as it is released the film will run again. In the CINE and STOP
position the control switch B has no effect. When .sw it ch A is
turned to AUTO, B now comes into effect and 1 through 12 FPS
may be selected. The single frame button will still stop the
film as in CINE. On the slower speeds it will be noticed that
after the single frame button has been pres sed one more frame
will be moved before the projector stops, this is quite correct.
If it is desired to stop the projector on a particular frame turn
the control A to STOP and the machine will stop at once. The
FWD-REV switch operates at any frame rate and the projector
may be reversed from any speed without stopping the film.
2. 3. LENSES.
Proj
ection lens es from I" through 4" are available to provide
almost any size picture that may be required. A bi-focal
converter is available for the standard 2" lens and will change
the focal length to either 1 5/8 or 2 1/2 ins.
3.
(C) by LW / Kodak
download from : www.olafs-16mm-kino.de

2. 4. PROJECTION LAMPS.
Projection lamps are available from 200 to 1000 watts. The normal
lamp supplied with the projector is 750 watts and this will be found
suitable for most subjects. For viewing small pictures the 300 or
500 watt lamp may be quite satisfactory and will avoid unnecessary
heat getting to the film.
2. 5. CLEANING PRESSURE PLATE.
The pressure plate should be removed and cleaned about every ten
hours of operation. To remove the pressure plate run the projector
with the control box in the STOP position then switch off the motor
but DO NOT UNPLUG projector from the AC line. This will ensure that
the claw pins are retracted. The pressure plate D in Fig. 1. may now
be removed by pulling directly out of the proj ector.
2. 6. USING DESK TOP VIEWING SCREEN.
Release the screen from the inside of the front cover and remove
completely. The mirror under the screen is a first surface mirror
and should be cleaned with ca re . The diagram below shows
approximate distances for the mirror and screen, final adjustments
can easily be made when the outfit is set up.
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4.
(C) by LW / Kodak
download from : www.olafs-16mm-kino.de

3. OPERATING PRINCIPLES OF THE PROJECTOR.
3. 1. MECHANICAL.
With the conventional type of narrow gauge cine projector the film
is transported in intermittent motion by a claw mechanism which is
in turn controlled by an integral vertical and horizontal cam. The
vertical cam causes the claw to move the film either upwards or
downwards depending on whether the pro] ector is operating forward
or reverse and the horizontal cam causes the claw to engage the
perforations on the motion stroke and holds it retracted on the return
stroke. In the case of the 224-A the action of the horizontal cam can
be controlled independently; when operating in normal cine mode the two
cams function together in the same way as with a conventional projector.
It should be noted here that the claw is spring loaded into the film
perforations and positively pulled out by the horizontal cam action.
ItLs therefore possible by means of a suitable mechanical device
to hold the claw in a retracted position permanently disengaged from
the film perforations; this device is the claw magnet. When this is
energized the claw is held in the retracted position. The claw
continues to move in the vertical plane in the normal fashion but as
it is permanently retracted never engages the perforations and
therefore the film remains stationary. When the projector is given a
signal to single frame the claw magnet is de-energized freeing the
plunger to move again at will, as the spring action of the claw is very
much stronger than the very light spring behind the plunger. In the
case of single frame operation as is now being considered, as soon as
the claw has pulled one perforation a signal is immediately given to
the magnet to energize, locking the plunger once again. For pulse
operation a series of signals are given to the claw magnet, each one
long enough for only one frame. For cine operation the magnet is
continually de-energized for as long as the film is desired to run.
There is also an electric clutch to drive and disengage the sprockets
as required; an electric brake provides frictional damping to prevent
overrun. Various elements in the circuit control these items to insure
that when the claw pulls one frame of film the sprockets do likewise
to maintain a constant loop.
5.
(C) by LW / Kodak
download from : www.olafs-16mm-kino.de

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Fig. 8.
Fig. 7.
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A complete circuit diagram is shown on
the oppos ite page, and the two ins ets
on this page show the main electrical
components of the proj ector. The fol-
lowing brief description will help to
understand the working of the circuit.
The two main components are the claw
magnet and the clutch, contro Hed by
SCRs land 2 respectively; they are
never both energized at the same time.
The brake serves only as a damper to
prevent excessive overrun when the
clutch is turned off. The timing drum 0
in Fig. 7 supplies positive pulses to the
base of Q-5 which are exactly timed to
the shutter through contacts W The
various segments on this drum provide
the slow speeds of the projector.
With the projector running and the
control box in ' stop position SCR-l is
triggered through lower rear cam contacts
M, claw magnet (F Fig. 8) is energized
holding claw retracted; therefore film is
stationary. Closing SW-l a positive
signal is given to the base of Q-5
turning off SCR-l through C-6. The
anode of SCR-l is now driven positive
through the claw magnet and R-16. This
forward biases Q-3 turning on SCR-2
and the clutch. The magnetic pick up E
in Fig. 8 senses one turn of the drive
shaft and turns off SCR-2 through Q-2.
As long as SW-l is closed C-6 cannot
re-charge, so the cycle cannot repeat
until SW-l is released. The operation
in any of the automatic slow speeds is
very similar. C-6 can charge after
each cycle so they will repeat indefinitely.
The FWD/REV delay cam N in Fig. 7 working in series with SW-4 serves
to stop all turn-off signals reaching SCR-l from the time the reversing
switch is changed until the motor hss changed direction. R-24 and C-8
delay the operation of K-l long enough to allow the motor to complete
one revolution before changing direction after SW-4 is moved. K-2 is
wired in with the 1 FPS lead.
The AC part of the circuit should be self explanatory. The transformer
and DC supply are not switched to avoid tearing the film if the projector
should be switched off while the film is in the gate.
3. 2. BASIC CIRCUIT OPERATION.
6.
(C) by LW / Kodak
download from : www.olafs-16mm-kino.de

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(C) by LW / Kodak
download from : www.olafs-16mm-kino.de