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
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Schematic-----------------------------------------------------
Shutter Carrler-------------------------------------------------
Technical Specifications-----------------------------------------
Timing Drum----------------------------------------------------
Trouble Shooting-------~-----------------------------------------
7
9,11,16
22
8,13,20
23,24
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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.
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--- A
1:---- 8
O - - ----f
8 - - ---,1
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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.
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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.
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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.
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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.
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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.
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4. SERVICING PROCEDURES.
4. 1. MAINTENANCE.
Very
little maintenance is required on this
projector. The aperture and pressure plates
should be cleaned every 10 hours of operation.
For details see page four. The other important
thing to do is to always keep the projector as
clean as possible, do not use in dusty or sandy
pla ce -s if at all pos stble tAbou tevery 1000
hours or two years of operation the unit should
be returned to the factory or other depot
authorized to carry out preventative maintenance.
4. 2. DISMANTLING PROJECTOR.
TO
REMOVE MECHANISM FROM CASE
Open rear compartment unwind power cord and
remove two screws holding small horizontal fig. 2.
panel and remove. In Fig. 2 remove screws
A,B,C,G,H,F ,LK, remove control box and lift out mounting block. Unscrew
lever D and remove collar E. Entire mechanism may now be removed from case.
Proj ector will now be as in Fig. 3.
TO REMOVE MOTOR CONTROL BOARD
Unplug connectors C&E Fig. 3 and remove screws G and F, do not lose
fiber washers between board and proj ector casting. It is most important
that these are replaced otherwise the board will ground to chassis.
TO REMOVE POWER pANEL
Unplug remaining connectors and remove
screws A, B, C , S, and R Fig. 7.
TO REMOVE CLUTCH TIMING DRUM
Remove screws D, E, and F in Fig. 7 unplug
connector to power nanel , Note that this assy.
is dowelled in place and the flats on the rear
cam must face the nylon gear L. Projector will
now appear as in Fig. 4.
F ig. 30
8.
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TO REMOVE BLOWER CASTING
Remove
proj ection lamp and the three
s crews holding lamp chimney. Remove
s crews AIBI and C Fig. 4 and cable
clamp from under blower motor. It is
also helpful to remove the two screws
and the copper air tube as well. The
blower casting may now be removed
from the main casting but it will still be
attached by the leads to the fan motor.
TO CHANGE DRIVE BELT
To change the drive belt it will be
necessary to follow the dismantling
procedures so far outlined with the
exception of removing the motor control
board.
Fig. 4.
TO REMOVE SHUTTER CARRIER
Place a large sheet of clean paper under the projector to conserve the
iron powder in the clutch. Place a 1/8 steel rod through the hole in
worm D Fig. 5; hold shutter carrier G close to shutter with suitable grips
and unscrew worm. Shake all powder out of clutch and remove allen cap
screw from clutch rotor by holding mainshaft with a rod through hole D
in Fig. 8• Remove clutch rotor I it is tapped for a 6-32 puller. Disengage
felt pad from cam; then by pushing down on claw to remove follower from
cam the shutter carrier may be slid off the shaft.
Fig. 5.
F DE
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Fig. 7.
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TO REMOVE MAINS HAFT •
Remove
the two screws A in Fig . 6 that
hold the bearing into the casting. Unscrew
Brake cap W in Fig. 2 page 8, shake out
all iron powder on to clean paper & save
it for replacement. Place a steel rod through
hole in mainshaft D Fig,8 and unscrew allen
cap screw in end of brake rotor. Rotor is
threaded for a 6-32 puller. Loosen two
setscrews in worm H. Loosen clamp C by
screwing in 3/16 hex. bolt. Take out clamp
and magnetic pick up E. Loosen setscrew
in rotor J. The mainshaft may be withdrawn.
TO REMOVE BRAKE.
Follow instructions in mains haft removal to
remove cap and rotor; also magnetic pickup;
pickup rotor need not be removed. Cut wires
from brake at a convenient place for
soldering and s leeving on replacement.
Unscrew nut Gand pull out complete brake assy.
remove mainshaft to replace brake as sy ,
Fig . 8.
It is not necessary to
TO REMOVE CLAW MAGNET.
Disassembly of any remaining parts on the
projector should be self evident. If any
further clarification is required refer to the
parts brea kdown section on page 25 or to
the Eastman Kodak section starting on page 37.
TO REMOVE PARTS NOT SPECIFICALLY LISTED.
H
Unscrew the two allen cap screws H in Fig. 6 and the claw magnet
complete with mounting block may be removed. To remove the claw
magnet alone screw in adjusting nut B in
Fig.8 having loosened screw A. The claw
magnet may then be pulled out of the
adjuster.
F ig. 6.
10.
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4. 3. REASSEMBLY AND CALIBRATION.
TO INSTALL
BRAKE AND MAINSHAFT
If the mains haft has been removed it will be easier to install the brake
before the mainshaft, however the procedure would be the same if the
mainshaft were in place. The pin in the brake housing locates in the
projector casting and the wires feed through the slot. Leave off the
plated tube until the iron powder has been put in, as this tube tends to
accentuate the residual magnetism in the brake making the powder
solidify. Replace the brake nut G, do not over tighten. No calibration
is required. Drop the pick up rotor J in Fig ~ 8 into brake inside the
proj ector with the sets crew facing the rear of the pro] ector. Place
nylon worm as in Fig. 8 then slide mainshaft through worm and rotor.
Tighten screws in worm and rotor, position rotor as far to the back of
projector as is possible to still tighten screw. Do not forget to replace
screws A. in Fig. 6. No calibration is required.
TO INSTALL CLAW MAGNET AND MAGNETIC PICK UP
Replace screws H Fig. 6 that hold mounting block in place. For the
following description it will be assumed that the shutter and cam
have been replaced. Connect a24 VDC supply to .the claw magnet
leads (this can also be done with the projector assembled and the
control box in stop position) keeping the claw magnet body F in
Fig.8 pushed against adjuster B, adjust B until the magnet prevents
the claw pins from penetrating the aperture plate while the shutter
is slowly rotated. Tighten screw A. This will be an initial setting.
Final setting is accomplished by adjusting B for minimum noise with
proj ector running at 12 FPS. Magnetic pick-up is held by clamp C,
install pick up with slot in rotor faoinq away from it, push in till
they touch then pull pick -up out. 002-.003, tighten clamp by unscrewing
4-40 hex. head screw.
TO INSTALL SHUTTER CARRIER ASSEMBLY
Replace shim washers C and spacer K Fig. 6 on mainshaft , Shutter
carrier may then be installed. Make sure that the nylon follower N
and felt pad M both ride on the inside cam. With the aperture plate
installed rotate the shutter and note the penetration of the claw pins
beyond the aperture plate. Adjust.thts from .025-.030 by means of
changing the shim washers C. The small brass piece F is to replace
the nylon follower on the inner cam if for some reason (such as an
unperforated splice) it should jump off and ride on the outer cam.
Install clutch and brake rotors and tighten against each other to
60 in ozs , torque. Using powder measure part no. 10004 charge
clutch and brake. Make sure threads .are clean of powder then screw
in shutter carrier worm; tighten to 10 ft lbs torque.
11.
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G
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K
M
p
Fig. 7.
12.
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TO INSTALL CIRCUIT BOARDS
Installation is quite straightforward, the only important thing to
remember is that the fiber washers MUST be installed under the
screws holding the motor control board, otherwise it will short
to ground. The connectors plug in the way the wires are dressed.
TO INSTALL CLUTCH TIMING DRUM ASSEMBLY
Remove screw H and let bracket hang loose, loosen screws G&K.
Install spring washer, F Fig. 5, and the bearing (Part no. 411 0) in
the clutch. Now install the as sy , first locating the dowel pins,
then putting in the three screws D, E, &F and tightening. Position
the bracket holding the timing drum so that the nylon gear L is a
snug fit against the worm V, tighten screws G and K. The shutter
carrier must now be free to spring load against the clutch assy.
and return under its own pres sure. If it does not the worm is prob-
ably too tightly meshed with the nylon gear or the entire casting
may be bent out of line. Next install the two parts of the rear cam
U and the setscrew T, these must be quite clean and free of grease.
Now install the bracket and screw H checking the shutter carrier
again for spring loading. Set all the contacts to make firmly in
their respective notch in the timing drum. Contacts P should make
at each end of cam N. Rotate shutter carrier until the claw pins are
extended and in the center of the downward stroke, hold shutter in
this position. Loosen screw T in rear cam and rotate cam so that
the flat which operates contacts W is 180 0 away from them, it will
be in line with the lower contacts M but not of course closing them.
The rear cam is now correctly positioned, tighten setscrew T.
Rotate shutter now until contacts Ware closed, loosen screw in
timing drum 0 and rotate it until all the contacts are closed - there
is only one such place on the drum - then tighten the setscrew in
the timing drum. There is a special fixture available (Part no. 10005)
which plugs into the connector from the timing drum as sy .; this has
6 indicator lights - one for each set of contacts on the timing drum -
and enables the setting to be done very accurately. This setting is
very important and if any amount of service work is expected this
fixture is strongly recommended. The outer part of the rear cam U
must be free to rotate and take up its position against the screw T
in both directions; a very small amount of Dow Corning FS 1290 may
be applied to the rear cam to prevent squealing. It is also most
important to use this lubricant under the OUTER nylon pads on the
contacts M and W; this can be seen quite clearly on the illustration.
13.
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Fig:. 17.
TO INSTALL APERTURE PLATE.
Fig. 18.
o
Turn shutter until the claw is at the lowest part of the stroke. The
aperture plate with heat filters may now be inserted. This is a little
difficult but it will go in with no force at all when it is maneuvered
correctly. The penetration of pins C will have already been set on
previous assembly at 0025 - .030 ins. It will be noted that the two
holes for screws A&B are slotted. Thread film (using old stock
that is no longer required) and run pro] ector at 16 fps 0 If neces sary
loosen screws and move plate slightly until film runs quietly without
hitting claw. Finally turn framing knob to both extremes and adjust
further if required.
FRAME COUNTER
The frame counter is driven through the drive assy. D from the lower
sprocket gear. The beaded chain then drives the counter directly.
When replacing the chain note the direction of twist in the illustration.
The slack in the chain is taken up by a spring tensioner in the cover.
14.
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5. REPAIRING AND REBUILDING SUB ASSEMBLIES.
5. 1. BRAKE ASSY.
A
IBC
1o
Fig. 12.
E
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. ~
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The only renewable parts in the brake as sy , are the seal C and
bearing E. The seal may be pulled out of the front of the brake
with a suitable hooked tool. Remove the snap ring F and tap the
bearing out of the back end. When replacing the seal the lip
must face towards the tube B. The windings should not ground
at either end, if they do, the brake will have to be replaced.
If a de-magnetizer is available it is a good thing to de-magnetize
the brake before re-assembly as this will help to get the iron
powder in easier. Before installing the brake make sure a nut
will start on the threads easily especially if the mainshaft is
still in place.
15.
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5. 2. SHUTTER CARRIER ASSY.
, ~
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t
P F G
--H
K
Q t!
1 I t
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B
Fig. 9.
It is not recommended that cam holder P be removed from the shutter
carrier assembly. It is ground on the carrier to ensure a max of • 0002
TIR. This is the maximum permissible for steady picture projection.
If this is removed it will be almost impossible to relocate it correctly,
so unless it is vitally necessary for an immediate repair, order an
exchange unit from the factory if there is any trouble with the front
bearing. The bronze worm B is also machined as a unit with the
carrier and must be kept with its individual carrier; the worm cannot
be supplied as a spare. Replacing the sea 1 C and rear bearing is
quite straightforward, remove seal with hooked tool, remove snap
ring and tap out bearing from the front with a long 3/16 rod. When
replacing seal note that the lip must face outwards. To remove cam F
undo nut G (special socket is available if required, 8005) and replace
with new cam. Prior to removing old cam note position of locating
hole. Position new cam with locating hole in approximately the same
place. Final setting of shutter to remove travel ghost will have to be
made by running test film in the projector. To adjus t , loosen three
setscrews in shutter collar K, turn shutter a small amount either way
and recheck; this will probably have to be tried several times before
it is set correctly. 16 FPS is the best speed for these tests.
16.
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5. 3. CLAW MAGNET AND MAGNETIC PICK UP ASSEMBLIES.
B
Ic
-H
I
L
Fig. 15.
E
IF
1
Both these units are non repairable so service consists of checking
their proper operation.
The claw magnet when energized with a 24 VDC supply should have
a holding force of at least 18 ozs . If it does not it must be returned
to the factory for an exchange unit. There should be no side play in
the plunger shaft L. The plunger stroke should be approx •• 032 ins.
The magnetic pick up is a sealed unit and non exchangeable. To
check operation, place a flat piece of iron (such as a screwdriver
blade) against the pole piece and pull sharply away. A p-p voltage
of approximately 5 into a 2.7 K ohms resistor should be seen.
Neither coils should go to ground.
17 .
(C) by LW / Kodak
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