RCA 400 User manual

INSTRUCTIONS
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pro 4/in
16 mm Motion (Picture Equipment
RCA 400 SENIOR
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IB-24693

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CUSTOMERS WARRANTY
Should any parts (except tubes, phototubes and lampswhichcarry the separate
warranty of theirsupplier) be found defective in material or workmanship within
ninety (90)days from the date of sale bythe Dealer, the Dealerwill promptly
make the necessary repairs or replacements.
This warranty applies only tonew equipment. It does not apply toany equip-
ment which has beenrepaired or altered inanywaysoasto affect its stability
or reliability; nor which has beensubject to misuse,negligence, or accident;
nor which hasthe serial number altered,effaced, or removed.
If this equipment does not perform satisfactorily,contact the Dealer from whom
you purchased it.
<**
IMPORTANT
Be sure to fill inand mail the Registration Card attached tothe projector.
Thiswill:
1. Allow RCAto register your projector intheRCA WARRANTY PLAN.
2. Record your equipment in case of loss from theft.
3. Bring you from time to time newand informative literature concerning
the utilization of 16mm motion picture equipment.

TECHNICAL DATA
NOTE: The instructionscontained in this
manual alsoapply tothe50 cycleequip-
ments MI-1338-F and MI-1345-F.
Power Required
1000 watts - with 750 wattlamp - MI-1338
1150 watts - with 1000 watt lamp - MI-1338
975 watts - with 750 wattlamp - MI-1345
1150watts - with 1000 watt lamp - MI-1345
105to125 volts
60 cycles
ProjectorLens
Speed: f/1.6
Focal Length: 2 incheswith a field flattener element
Coated onallairto glasssurfaces
ProjectionLamp
750 watt, 115 volt, T12P
Sound Lamp
3/4-ampere, 4-volt, prefocused,
S-8 doublecontact
TubeComplement
MI-1338 MI-1345
1 RCA6J71 RCA 6SL7GT
1 RCA6J52 RCA 50L6GT
1 RCA 6SL7GT 1 RCA 6V6GT
3 RCA 6V6GT 1 GE 12AY7
1 RCA 5Y3GT 1 RCA921
1 RCA921
Amplifier Fuse
"Senior" modelonly
1-1/2amperesType 3AG (time lag)
(5 sparesfurnished)
Amplifier
Junior — MI-1345 — 7 wattsratedoutput
6—8 ohms impedance
Senior - MI-1338 —10 wattsratedoutput
6— 8 ohms impedance
Dimensions,CarryingCase
MI-1338
inches
Length 15-1/2
Height 15
Width 10
W-1312-B
inches
19-5/8
15-5/8
9-1/4
MI-1312-A MI-1345
inches inches
19-5/8 13-7/8
15-5/8 15
9-1/4 9-5/8
Weight
MI-1338 MI'1312-B
pounds pounds
Equipment 39-1/4 19
Shipping 46 26-1/2
MI-1312-A MI-1345
pounds pounds
2033
27-1/2 39
WARNING: Donot operate the equipment
onany powerfrequencyotherthan that
specified onthe name plate or damage may
occur tothe equipment.
DESCRIPTION
Application
TheRCA Model 400, 16mm Motion Picture
Equipment is portabledeluxe equipment designed
for high quality presentation of 16mm sound and
silent motion films. Itcanbesetupfor operation
inany suitable location where power ofthere-
quired frequency and voltage is available — see
nameplate on equipment.
This equipment canbe used with a microphone
or a phonograph for public address, either simul-
taneously with silentpictures or independently of
projection. Itis alsodesigned to give excellent
quality reproduction of full color motion pictures.
Components
TheRCA400 16mm Motion Picture Equipment
is available in two models:
1.TheRCA400 "Senior" which consists of
either an MI-1338 oran MI-1338-F Projector -
designed, respectively, for 60-cycle and 50-cycle
operation — with accessories, initsown carrying
case, andan MI-1312-B Speaker in another case.
2. The RCA 400 "Junior" which consists of
either an MI-1345 oran MI-1345-F (60and50
cycles,respectively) Projector with a Speaker and
Accessories ina single carrying case.
Additionally, the MI-1312-A Auxiliary Speaker
in a carrying case is available upon separate order
for use with either the "Senior" or the "Junior"
equipments.
OPERATION
Setting Up
Arrange the equipment as follows:
1. Place the projector ona sturdy table or
stand so that the distance from the front edge of
the table tothe projection screen is about five
times the width ofthe screen. (This ratioholds for
a 2-inch projection lenssuch asis furnished with
the equipment.) Place the projector onthe table
so that theendofthe projector upon which the
reels are mounted is flush with the edge ofthe
table.
2. Remove the front cover of the projector.
Remove the accessories contained inthe cover

FRAMING KNOB
THUMBSCREW
AMPLIFIER>
AMPLIFIER
ON-OFF
SWITCH
LAMP ..
HOUSE
LENS LOCK
FINGER STOP
LOWER LOOP-
LAMPADJ.
SCREW
TONECONTROL
VOLUME
CONTROL
MICROPHONE
JACK
LAMP
SWITCH
PROJECTOR
SWITCH
SPEED
SELECTOR
LOWER
SPROCKET
SHOE
THREADING
LAMP
UPPER
LOOP.
UPPER
SPROCKET
UPPER
FILM REEL
THREADING
LAMP
SWITCH
SPROCKET
SHOE
REWIND-
OPERATE
LEVER
UPPER
REEL ARM
THUMBSCREW
UPPER REEL
ARM
PROJECTION LENS
PRESSUREROLLER
GUIDEROLLER
SOUNDDRUM
TENSION ROLLER
SPRING BELT
SOUND
OPTICAL
BRACKET
LOWER
REEL ARM
THUMBSCREW
LOWER
REEL ARM
LOWER
REEL
LOWER
SPROCKETEXCITER
LAMP HOUSING 70046
THUMBSCREW
-SNUBBER
ROLLER
Figure 1 - Operating View ol RCA400 "Senior"

REFER TO FIGURE I
FOR ALL OTHER
OPERATINGCONTROLS
AMPLIFIER
OFF-ON
SWITCH
VOLUME
(LARGE)
TONE
(SMALL)
SPEAKER
JACK
SOUND LAMP
OBSERVATION
WINDOW
T ILTI N G
CONTROL
Figure 2 — Operating View ol RCA 400 "Junior"

and place them onthe projector table or nearby the
projector. Thencarry the speaker tothe projection
screen and place itona chair or othersuitable
elevatedsupport,preferably at least four feet from
the floor.
Mounting Reel Arms
Attach the reel arms tothe projector andput
the spring belts on theirpulleys inthe following
manner:
1. Fasten the reel arms (seefigures 1 and2)in
place with the thumbscrews, and pull outthe spring
belts andput them over the pulleys onthe arms.
Make sure the belts arenot twisted(see figure 8).
Connections
To connecteither ofthe "Senior" models —
MI-1338 or MI-1338-F - toits speaker andtothe
power service proceed as follows:
Insert the plugs onthe power and speaker
cables into the receptacles provided for them inthe
back ofthe projector;insert the plug onthe other
end ofthe speaker cable inthe jack onthe speaker.
Plug the connector onthe free endofthe power
cableinto the nearest 105-125 volt 60 cycle, or50
cycle, AC power receptacle. Consult the name
plate onthe projector to determine the correct
projector power frequency.
To connecteither ofthe "Junior" models —
MI-1345 or MI-1345-F - proceed as follows:
Remove the cableloaded reel from the pro-
jectorcover and mount itonthe lower reel arm
shaft. Pull the cable offthe reel by hand and
connect ittothe speaker andtothe SPEAKER
jack onthe projector.
Plug the connector onthe free endofthe power
cableinto a power receptacle ofthe correctvoltage
and frequency as specified onthe projectorname-
plate.
Run the speakercable inthe most convenient
manner, preferablyaround the edge ofthe room,
where it will beoutofthewayofthe audience.
See sectiontitled "Projection Practice".
Initial Adjustments
Preliminary focusing and certain otheradjust-
ments are best donebefore the projector has been
threaded. Refer to figures 1 and2 for location of
controls.
1.Putthe PROJ-OFF switch inthe PROJ
position, andthe LAMP-OFF switch inthe LAMP
position.
2. Loosen the lens lock. Focus by moving the
projection lens back and forth inthe picturegate
for rough adjustment andby rotating itfor fine
adjustment until the outline ofthe lighted area on
the screen is well defined.Tighten the lens lock.
3. Adjust the distance between the projector
and the screen until the width ofthe lightedarea
is slightlygreaterthan the width ofthe white
portion ofthe screen, and then center the light
vertically with the tiltingcontrol.
NOTE: When the picture is slightly
largerthan the whiteportion ofthe screen
the edges ofthe picture will be clean cut.
4. Throw the LAMP-OFFswitch totheOFF
position. Then throw the PROJ-OFF switch tothe
OFF position.
Threading
Refer to figures 1 and2 and thread the projector
in the following manner:
1. Place an empty reel onthe lower reel arm
and a reel of film onthe upper.
2. Unwind the film until the picture or title
frames are reached and examine the film tosee
whether itis ready for threading. Todo this, con-
sider yourself inthe position ofthe projection lamp
and look through the film toward a light. With the
end ofthe film downward, the pictures or titles
should be upside down and reversed, andthe
sprocket holes on sound film should be toward
your right. If these conditions are met, the film is
ready for threading.
3. Make sure the REWIND-OPERATE lever is
in the OPERATE position.
4. Hold the film about four feet or more from the
end, and press down onthe uppersprocketshoe
with the right-hand thumb.
5. Slide the film under the upper sprocket. Make
sure that the sprocket teeth engage the sprocket
holes. Release the sprocket shoe.
6. Open the picturegate by pulling the lens
lock and place the film onthe aperture plate, be-
tween the guide rails andthe side shoe. Form the
upper loop of film above the apertureplate so that
the film follows the whiteguide line onthe pro-
jector frame. Close the picturegate with your
thumbs.
7. Form the lowerloop of film below the picture
gate as indicated bythe whiteguide line and finger
stop(see illustrations).

8.Runthe film over the guide roller, under the
rubber pressureroller,clockwisearound the sound
drum, and over the tension roller.
9. Thread the film tothe left ofand under the
lower sprocket.
10. Next runthe film under the snubberroller
to the lower reel.
11. Insert theendofthe film inthe slot inthe
hub ofthe lower reel, or attach ittothehub with a
piece of adhesive tape.
12. Rotate the reel clockwise by hand to take
up film slack. Lift the reel slightly to equalize
belt tension. This willprevent the reel from rolling
backwards when itis released.
Operating
Sound Pictures
When soundpictures aretobe projectedproceed
as follows:
1. Turn the ON-OFFswitch onthe amplifier to
theON position.
NOTE: The soundlamp lights within 15-30
seconds after the ON—OFF switch has
beenturned ON.Itcanbe observed through
the observationwindow(seefigure 2)in
its housing.
2. Turn the VOLUME control to "0", andthe
TONE control to"5"onthe "Senior" model, orto
NORMAL onthe "Junior" model.
3. Turn the PROJ-OFF switch to PROJ, then
turn the SPEEDSELECTOR downward to SOUND.
4. Turn the LAMP-OFFswitch to LAMP, in
that order.
5. Focus by rotating the projection lens until
the picture is clear and distinct. Titles or other
printed portions ofthe picture make excellent sub-
jects on which to focus.
6. Turn the VOLUME controlclockwiseuntil
the desired volume is obtained.
7. Frame the picture, if necessary, by turning
the FRAMING knob until one completepicture
shows onthe screen.
8. Adjust the TONE control forthe most pleas-
ing effect.
9. When the last picture has appeared onthe
screen, and before allthe film has passed through
the projector,return the LAMP—OFF switch to
theOFF position.
11. Finally, return the PROJ-OFF switch to
the OFF position.
NOTE: Occasionally, damagedfilm may
prevent the intermittent pull-down claw
from properly engaging the sprocket holes
in the film. This may result inthe loss of
the lower loop. When this happens, the pic-
ture onthe screen is blurred. The difficulty
can be remedied immediately, without stop-
ping the machine, by placing a finger above
the film asit emerges from the lower endof
the picture gate and quickly pulling down
on the film until the finger strikes the
finger stop (seefigure 1).
The THREADING LAMP, onthe "Senior" model,
canbe turned on with the THREADING LAMP
switch when light is needed during a show,thus
eliminating the necessity for turning onthe room
lights. The cover of this lamp canbe rotated to
direct the lightwhererequired.
Silent Pictures
Proceed asfor showing a sound picture, with
the following exceptions:
1. Turn the speed selector upwardtowards
SILENT. This decreases the speed of the projector
to thatappropriate to silent pictures.
2. Leave the ON-OFFswitch onthe amplifier
intheOFF position. Omit any adjustment of volume
or tone, unless the public address feature istobe
used. Ifitis, consult the section on "Public
Address and Record Playing" in this manual.
Rewinding
Film should be rewound immediately after pro-
jection. Rewinding is donequickly with the projec-
tor as follows:
1. Bring theendofthe film from the lower reel
directly tothehubofthe upper reel, withouttwist-
ing the film, and attach it. Give the upper reel a
few turnscounterclockwise by hand to take up film
slack.
2. Turn
REWIND.
the REWIND-OPERATE lever to
10. Turn the VOLUME control to
asthe sound ceases.
'0" as soon
3.Putthe PROJ-OFF switch inthe PROJ posi-
tion andletthe projector run until the film is re-
wound.
4. Turn the speed selector downwards toward
SOUND.
When twoor more reels aretobe shown, itmay
be desirable to postpone rewindinguntil allthe
reels havebeenshown, since this shortens the
delaybetween successive reels. Asa result, the

question may arise asto whether ornota reel has
been rewound. This may easily be determined by
examining the film as explained in step 2 ofthe
section titled "Threading". Ifthe film isnotin
the position specified there, it requiresrewinding.
Packing Up after the Show
When the show is over, in order to pack upa
"Senior" model proceed as follows:
1. Remove the reels andthe reel arms from the
projector and replace them in the projectorcover.
2. Crank the tiltingcontrol downward asfaras
it will go.
3. Disconnect the power and speaker cables.
Form them into rolls of appropriate size, andre-
place them along with the empty reel andany
reels of film inthe speaker case. Ifthe equipment
does not include a speaker,pack the power cord
in the projector cover.
4. Push the spring belts into the projector case
and replace the cover onthe projector.
Pack upa "Junior" model inthe following
manner:
1. Mount the empty reel onthe upper reel arm
shaft and disconnect the speakercable from the
speaker and projector.Leave the cable lying on
the floor fully extended,free of obstructions,
straight and untangled, so that itcanbe wound
without difficulty onto the empty reel.
2.Setthe REWIND-OPERATE lever, onthe
projector, inthe OPERATE position.Pick upthe
plug attheendofthe cablenear the projector and
lay itinthe reel; bring itoutofthe side ofthe
reel — betweenspokes — and around the nearest
spoke and backinto the reelagain finally leaving
it lyingbetween the next two pairs of sookes as
shown in figure 4a. This is done so that the plug
and cable will not fall outofthe reel when itis
turned. Rotate the reel by hand, inthe rewind direc-
tion, for threerevolutions to wind on that number
of turns of cable. Putthe REWIND-OPERATE
lever inthe REWIND position and start the projec-
tor to wind the cable onto the reel. Guide the cable
by hand while itis winding, and when itis comp-
letely wound, weave the loose end about a spoke
to prevent it from unwinding(seefigure4b).
3. Remove all reels and reel arms from the pro-
jector.Pack the cableloaded reel inthe cover by
mounting itonthe stud provided forthe purpose.
Putthe power cord inthe space provided forit
beneath the projector.
4. Push the spring belts into the projector case,
retract the tilting mechanism allthe way, and re-
place the cover onthe projector.
Public Address and Record Playing
When itis desired touse either a microphone or
a phonographpickup, a shielded cable anda shield-
ed standardtelephone plug will be required for
SCREEN
t INCH LENS
2 INCH LENS
3 INCH LENS
M-147179
Figure 3 — Relations of Focal Length and Projection Distance

77104
"B"
Figure 4 — Winding "Junior" Speaker Cable on Reel
connectingeither device. Assemble the cable and
plug and connect the cable tothe microphone or
phonograph pickup.Insert the telephoneplug inthe
jack marked MIC. Setthe ON-OFFswitch onthe
amplifier intheON position. Adjust the TONE and
VOLUME controls to obtain the mostpleasingtone
and suitable volume of sound.Remove the micro-
phone—phonograph plug from theMIC jack when
soundfilms aretobe shown.
For suitablemicrophones, phonograph pick-ups,
cables and plugsconsult your dealer. The following
types of shielded—two—conductor plugs, orany
plugs similar to them, maybe used: Carter *PG-52,
Switchcraft *70 or Mallory *75N.
PROJECTION PRACTICE
Choice of FocalLength of Lens
The focallength ofthe lenssupplied with the
RCA Model 400 "Senior" and "Junior" projectors
is2 inches. This isa valuewhichmeetsaverage
projection conditions. However, in some instances,
lenses of different focallengths maybe required.
For example, itmaybe required to project a picture
of given size from different distances, as shown in
figure 3. Table I below gives the relationship be-
tween picture size and projection distance for
lenses ofsix different focal lengths. Lenses may
be obtained from authorized RCA Audio—Visual
Equipment dealers and distributors.
TABLE I PROJECTION DATA
Projection
Dist tnce
Feet
10
15
2Q
25
30
35
40
50
60
70
80
90
100
1"
lens
3*8"
5'6"
7'4"
9'2"
1TO"
• •••
• • • •
•*••
• •••
iVi"
lens
->'9"
4'2"
5'6"
6'11"
S'4"
9'8"
ll'O"
....
....
Picture
2"
lens
no"
2'9"
3'8"
4*7"
5'6"
6'5"
7'4"
9'2"
iro"
Width
2W
lens
\'TA"
2'5"
3-2H"
4'0"
4MO"
5W
6'5"
8'0"
9'8"
11-3"
3"
lens
^•w
2'T'
2'9"
V5/i"
4'2"
4'10"
5'6"
6M1"
8'4"
9'8"
ll'O"
4"
lens
OM1"
T4&"
no"
2'3tt"
2'9"
3'2ft"
3'8"
4'7"
5'6"
6'5"
7*4"
8'3"
9'2"
NOTE: Picture height is % of picture width.

TABLE II
16MM LENSES
RELATIVE LIGHT TRANSMISSION
PERCENTAGES
Focal Length
1/2"
5/8"
1"
1-1/2"
2"
2-1/2"
3"
3-1/2"
4"
Speed
f 2.4
f 2.0
f 2.0
f 1.6
f 1.6
f 1.8
f 2.0
f 2.5
f2.8
Percent
44.5%
64%
64%
100%
100% Reference
79%
64%
41%
32.6%
Placement of Equipment and Spectators
If allthe spectators inthe room areto have an
unobstructedview ofthe screen, both the screen
and the projectorshould be raised above the heads
of the audience. Thetopofthe table upon which
the projector stands should beat least 4-1/2feet
high so that the beam of lightwill pass above the
heads of those whosit directly in front ofthe pro-
jector, andthe loweredge ofthe screen should be
at least as high asthe heads of those persons who
sit nearest tothe screen.
When a matte screen is used, noone should sit
closer toit than two screen widths, nor farther
from it than six screen widths, nor outside an angle
of 30 degrees from the center line. The most satis-
factory view ofthe picture is obtained in this area.
Beyond an angle of40 degrees the picturebecomes
noticeablydistorted.
When a beaded screen is used, noone should
sit closer tothe screen than2-1/2 screen widths,
not farther from it than six screen widths, nor out-
side an angle of20 degrees either side ofthe
center line. Beyond the 20-degree angle the bright-
ness ofthe screenfalls off rapidly.
Choice of Screens
A matte screen should be used whenever a
sufficiently brightpicture canbe obtained, forit
presents a more uniform brightness tothe entire
audience. A beaded screen appearsbrighterthan a
matte screen along the line from the center of the
screen tothe projector, butits brightnessfalls off
rapidly asthe observermovesaway from this line.
The screen recommendationsgiven in Table III
are based ontheuseoftheRCA 2—inch f/1.6
coatedprojection lens.
Precautions
In order to avoidinterruptions and disturbances
of sound and picture during a show, the observance
of the following details is worthwhile.
Securing Cables
The power and speaker cables should be secur-
ed so thattheycannotbecomedisconnected acci-
dentally by persons stumblingoverthem.Theymay,
for example, be tied to,or wrappedaround, a leg
of the projection table. Where they lieonthe floor,
they should be covered or otherwise protected.
Replacements
Interruptions caused by burn-out ofthe projec-
tion lamp orthe sound lamp are occasionally un-
avoidable, but the resultingdelayneed not be
protracted ifthe operatoralways keepswithin easy
reach a tested setof spares for immediatesub-
stitution. For details of replacement,refer to
"Maintenance".
PreviewingPictures
An experiencedoperatorwillpreview films he
plans to show in order to acquaint himself with
their peculiarities and thus be ready to make chang-
esin volume,tone, and focuswheneverthey are
required.
Care of Film
Film should be handledcarefully lest itbe
scratched or broken.Film is easily scratched by
winding ittoo tightly onthe reel so that adjacent
turns of film grind against eachother. Scratches
on film are verynoticeable on the screen and it is
costly and difficult to remove them.Filmshould be
handled bythe edges as much as possible, and
touching the picture or soundtrackareashould be
avoided. Occasionally, film should be inspected
for brokensprocket holes and other defects. Neces-
saryrepairs should be performed promptly.
When film is dirty it should be cleaned by pass-
ing it betweenfolds of lint-freeclothmoistened
with carbontetrachloride, or someother cleaner
suggested bythe dealer. Consult the dealer fora
humidor for storing film when itisnotin use.
Running Time
The running time of reels of givenlength of
16mm film depends on whether the film is sound or
silent, for sound film runs 24 frames per second
and silent film only 16 frames.Exactknowledge of
the runningtime of various films willhelp the oper-

ator in planning a show. Table IV below gives the
running time in minutes of 16mm films of various
footages.
TABLE III
PROJECTIONLAMPWATTAGE VS SCREEN
TYPE AND SIZE
(Values arefora reasonablydarkened room)
Lamp
Watts
300
500
750
1000
Average
Lamp
Life
Hours
25
25
25
10
Recommended Picture Width in Feet
Matte Screen
2-3
2-1/2 - 3-1/2
3-1/2 - 4-1/2
4-6
Beaded Screen
3-5
4-6
6-8
8-10
TABLE IV
RUNNINGTIME OF 16MM FILM
Footage
400
600
800
1000
1200
1400
1600
1800
2000
Time in Minutes
Sound
11
17
22
28
33
39
44
50
56
Silent
14.8
22.2
29.6
37.
44.4
51.8
59.2
66.6
74.
MAINTENANCE
Lubrication
It is important that the projector be properly
lubricated.Refer tothe "LUBRICATIONCHART".
LampAdjustment on "Senior" Model
Refer to figure 5 for location ofthe LAMP
ADJUSTMENT screw on the "Senior" model. When-
ever a new lamp is installed the screen illumination
should be checked, without film inthe picturegate,
for uniform distribution of light onthe screen. To
make the adjustment turn the LAMP ADJUSTMENT
screw tothe right or left as required,until the
screen is lighted uniformly.
Cleaning
If the equipment isto giveconsistentlygood
performance, it must be keptclean atall times.
Dust,oil, particles of emulsion, andall otherdirt
should be removed. To clean the equipmentproceed
as follows:
PROJECTION
LAMP
LAMP
ADJUSTMENT
SCREW
Figure 5 — Lamp House Open for Servicing
"Senior" Model
1. Cleaning fenses and reflector. Clean all
opticalsurfacesbefore use each time the equipment
isput into service. This maybe done by gently
wiping them with lens tissue. If necessary, breathe
on the lens before the tissue is applied. When more
thorough cleaning is required,consult your dealer
for a good lens cleaner. Donotuse carbon tetra-
chloride or alcohol onthe lenses. After lens clean-
er has been used, gentlywipe dry with lens tissue.
The following pointsneedattention:
a.The condenser lens (figures 5 and6).
To remove the condenser lens, pull outonthe
latch and withdraw the lens assembly from its
mounting with the left hand.Clean and replace the
lens, taking care notto touch the lens surface
with the fingers.
b.The reflector, which is opposite the con-
denser lens inthe lamp house, canbe cleaned in
place.
c.The projection lens (figure 1).To remove
this lens, loosen the lens lock and pull the lens
out ofthe picture gate. Clean and replace the lens.

10
taking care not to touch the lens surface with the
fingers.
d.The sound optical unit (lena tube). This
unit is mounted inthe clamp portion ofthe SOUND
OPTICALBRACKET(figures 1 and7). Unscrew
the EXCITER LAMP HOUSING THUMBSCREW and
swing the assembly outward. Remove the exciter
lamp from its socket. Clean the exposed front and
rear glass elements ofthe sound optical unitwith
a lint free cloth; donotuseany othermeans for
cleaning this lens. Donot loosen the clamp orre-
move the optical unit from its mounting; proper
positioning ofthe unit for optimum soundquality
requires tools and test facilities available only in
the factory orin qualifiedrepair shops. Replace
the exciter lamp after cleaning the optical unit.
2. Cleaning /amps. The projection lamp and
the sound lamp should be cleaned occasionally
as necessary.
a.The projection lamp (figure 5).To re-
move this lamp, press down onit firmly and turn
it counterclockwiseabout 90 degrees until it
releases from its socket. Wipe it clean with a
cloth and return ittoits original position. Be very
careful notto leave any fingerprints onthe clear
portion ofthe lamp;suchprintswill burn into the
glass and definitely impair the lamp efficiency,
fie sure the lamp is cool before attempting tore-
move it, or use a heavy cloth to protect the fingers.
Figure 6 — Lamp House Open for Servicing
"Junior" Model
b.The sound lamp. Open the optical bracket
as shown in figure 7 and clean the lamp in place.
3. Cleaning mechanical members. Filmdirtwill
collect onthe aperture plate, the film pressure
shoe (which presses the film against the aperture
rails), the sprockets, the sound drum pressure
roller, andonthe sound drum. Donotusea knife
or any other metal instrument, for removing the dirt.
An orangewood stick, or similar tool, maybe used
to dislodge hardened film emulsion particles.
a.The aperture plate. Open the picture gate
and wipe the aperture plate with a soft cloth to
remove dirt. Usea toothpick, if necessary, to re-
move dirt from corners. Clean thetwo side pressure
shoes with the bristle brushsuppliedwith the
projector.Clean the film pressure shoe inthe same
manner asthe aperture plate. A small amount of
thinner or cleaning fluid may be used to soften
cakedemulsion for removal. After all visible dirt
and emulsionhavebeenremoved, inspect and feel
the film contacting surfaces of both the aperture
plate andthe film pressure shoe to make sure they
are smooth and free from all foreign material,
scratches and pits. The presence of scratches or
pits may ultimately call for replacement ofthe
partinvolved, since film emulsionpiling upand
baking in such depressions cause film scratching.
b.The sprockets. Clean the sprockets with
bristle brush. Be sure that all dirt is removed from
the teeth.
c.The sound drum pressure roller. Wipe it
clean with a soft cloth moistenedwithcarbon tetra-
chloride. Rotate the roller to clean itall around.
d.The sound drum. Clean the sound drum in
the same manner asthe pressure roller. Be sure
to clean the back edge ofthe drum where the film
sound tracks overhang. Wrap a clean cloth around
the left forefinger and insert the fingerbetween the
guide roller andthe tension roller. Hold the cloth
against the back edge ofthe drum and rotate the
drum with the rightforefinger.Cleaning the back
edge ofthe sound drum from the left side in this
manner minimizes the possibility of disturbing the
small mirror behind the drum onthe right,which
reflects the lightbeam from the sound optical unit
into the phototube.
Replacements
The projectionlamp, andthe sound lamp are
the most likely components to requirereplacements
during a show.Sparelampsshould be keptconven-
iently at hand.

11
TROUBLE LOCATION AND REMEDY CHART
Description of Trouble
a. Loseslowerloop
b. Picture motion unsteady
c. Picture indistinct or
illumination low
d. Film beingscratched
e. Sound weak;picture normal
f.No sound;picture normal
g.No picture;sound normal
h. Reproductionnoisy
i. Sound on MIC; no sound
from film
Possible Cause
(1) Dirty apertureplate
(2) Defective film
(1) Loss of loops
(1) Dirtyprojectionlens
(2) Dirty condenser lens
(3) Projection lamp black or blistered
(1) Film pressure shoedirty
(2) Sound pressurerollerdirty
(3) Aperture plate dirty
(1) Volume control notset properly
(2) Microphone plug in jack
(1) Amplifier ON-OFF switch inOFF
position
(2) Microphone plug in jack
(3) Loudspeaker not connected
(4) VOLUME control notset properly
(5) Sound lamp burned out
(1) Projection lamp out
(2) LAMP switch OFF
(1) Backedge of sound drum dirty
(2) Dirty film
(1) Sound lamp burned out
Remedy
Clean
Cut out defectivepart and splice
Restoreloops
Cleanbothends
Clean
Replace
Clean
Clean
Clean
Adjust
Remove plug
Snap switch ON
Pull out
Connect
Adjust
Replace lamp
Replace lamp
Turn ON
Clean drum
Clean film
Replace lamp
1.The projection lamp (figure 5).Ifthe lamp
burns out during a show, turn OFFthe projector
and the lamp switches. Remove the lamp as de-
scribed under "Cleaning", paragraph 2a, using
a heavy cloth to protect the fingers. To install the
new lamp, line upthe wide and narrow flanges on
its base with the mating socket slots and insert
the lamp. Press the lampdown and turn it clock-
wise until it "clicks" into place. Avoid getting
fingerprints onthe clear portions ofthe lamp.
Turn the projector switch to PROJ., the lamp
switch to LAMP, and resume the show.
CAUTION: Do not open the projection
lamp door while the lamp is burning; the
glass sides of the lamp will soften and
bulge if it is removed from the blower air
stream.
2.The sound lamp (figure 7). Open the sound
optical bracket. Grasp the sound lampwith the left
hand as shown, lift it slightly and turn it counter-
clockwise to disengage the socket pins. To install
thenew lamp, line upthe notch inits flange with
the small hole inthe socket plate, and drop the
flange over the socket pins. Push it down against
the socket base and turn the lamp clockwise until
it snaps into place.
3. Amplifier Tubes. Access to amplifier tubes
for test or replacement is afforded by removing the
metal cover plate section onthe operating side of
the projector. Todoso, first remove the control
knobs and then the mounting screws which hold the
cover in place. To remove the 6J7 tube from the
Senior amplifier, first remove its shield capandthe
grid connection wire. Then grasp the body ofthe
tube firmlywith the thumb and first or second finger.
Moving slightly from side to side, pull the tube
straight outward from its socket. Then tilt thetop
of the tube upward to allow the large diameter of
the tube to clear the box-shaped housing forthe
microphone jack. Itmaybe necessary to rotate the
tube while tilting itto completely clear the box.
4. Fuse. The "Senior" modelamplifier includes
a fusemountedunder its chassis to protect its
powertransformer inthe event of tube failure. To
replace the fuse, remove the rear portion ofthe
projector case by removing its ninemounting
screws. Donotusea larger rated fusethan speci-

12
LUBRICATIONCHART
Points of Lubrication
Intermittent Cam
Motor
Guide Roller
Snubber Roller and
TensionRoller
Shoe, side pressure shoe
Pin, film shoe
PressureRoller
Oilless bearingssuch as
sprocket shaft, worm shaft,
etc.
Oilless bushingssuch as
intermittent gear,shutter
gear, rewind gears,etc.
All gearteeth, including
worm gear
Type of Lubrication
Sta-put heavyoil.E.F.
Houghton Co. Phila 370
(Supplied inoilcan with
projector)
SAE 30 Motor Oil
SAE 10 Motor Oil
Soft lead pencil, micro-
fine graphite, or Molykote
powder
Soft lead pencil, micro-
fine graphite, or Molykote
powder.
SAE 10 Motor Oil
SAE 10 Motor Oil
SAE 30 Medium Motor Oil
SAE 30 Medium Motor Oil
Light grease, RCA Stock
#205148, Esso Castroleum
**3 or equivalent.
Lubrication at Time of
General Overhaul
Saturatefeltswithoil, not
to point of dripping. If con-
tactpointbetweenfelt and
cam is worn,replacefelt.
Five drops in each hole.
One drop in shaft hole in
roller.
Apply smudge on shafts
(must be free of oil)
Apply smudge on shoe
before assembly(must be
free of oil)
Smudge on each pin
One drop in shaft hole in
roller.
A few drops in bearing
andon shaft.
A few drops in bushing
andon shaft.
Apply lightly toall teeth.
Periodic Lubrication
Ten drops inoil holeevery
500 hrs. or twice a year
whichever comesfirst.
Five drops in each hole
every1000hrs. or once a
vear, wnichever comes first.
Clean, thenapplyonly if
roller sticks or squeaks.
Clean,thenapply only if
roller sticks or squeaks.
fied. Ifthe fuse burns out repeatedly, check tubes
and amplifier forthe cause. The fuse will also
burn outifthe projector should inadvertently be
connected to D.C. power circuits, or to circuits
supplying over 125 volts.
5. Belts. Remove and replacebelts according
tothe instructions in figure 8.
6. Reel Arm. Refer to figure 9 for maintenance
information onthe lower reel arm assembly.
Service and Replacement Parts
If the equipment, dueto damage or long use,
should require service beyond the scope ofthe
operafions outlined inthe "MAINTENANCE"
section of theseinstructions, it should be sent
or taken toan Authorized RCA Audio-Visual Equip-
ment Dealer or Distributor. In generalthese RCA
representatives maintain complete servicingfacili-
ties and adequatestocks of supplies, accessories
and component parts. The following abridged parts
list identifies some component items which maybe
needed bythe projector owner in normal useand
maintenance. Replacement partssupplied maybe
slightly different in form or size from the original
parts but will be completely interchangeable with
them.

13
SOUNDLAMP
27807
THUMBSCREW
Figure 7 — Replacement of Sound Lamp
REPLACEMENT PARTS
Description
Stock No.
Belt, rewindspring belt, upper (see figure 8)
Belt, take-upspring belt lower(seefigure 8)
Film pressureshoe
Fuse (forSenior amplifier). Boxof5
Handlecomplete
Lamp,exciter lamp (seefigure 7)
Lamp, projection (seefigures 5 and6)
Lens, condenser lens, front(see figures 5 and6)
Lens, condenserlens,rear (see figures 5 and6)
Reflector,projection lamp
Ring, felt clutchdrivering(seefigure 9)
46937
46936
56036
98682
57680
27807
28448
47138
47139
28306
98678

REMOVING BELTS
PUSHFIRSTTURN
WITH THUMBNAIL
OR STRETCHSPLICE
OUTAND UNSCREW
70234
PHOTO - 70241
INCORRECT
REPLACING BELTS
COUNT NUMBER OF TURNS ON
SMALL ENDOF BELT.
TWIST SMALL ENDOF BELT
BACKWARDS-AS IF REMOVING
A SCREW-AN EQUALNUMBER
OF TURNS.
SCREW ENDS OF BELT
TOGETHER. THISMETHOD
PREVENTS BELT FROMCOMING
APART DURINGOPERATION.
TO IDENTIFY UPPER AND
LOWER BELTS REMEMBER
"LOWER IS LONGER"
Tl UPPER
BELT
46937
LOWER
BELT
46936
PHOTO-70243
CORRECT
Figure 8 — Removing and Replacing Belts
t

TO SERVICELOWER REEL ARM ASSEMBLY
52833
LOWER REEL ARM
ASSEMBLYCOMPLETE
LOOSENTHISSETSCREW
(NO. 10- 32X 3/|6) TO REMOVE
FRICTIONCLUTCH
ASSEMBLY. WHEN
REINSTALLING USETWO
THICKNESSES OF FILM
FOR ENDPLAYADJUSTMENT
CLUTCH SURFACE SHOULD BE
SMOOTH. REELSHAFTSHOULD
ROTATE FREELY.
FELT SHOULD BE SLIGHTLY
NARROWER THANCLUTCH GROOVE
AND ENDSSHOULD BE APPROXIMATE-
LY I/Q" APARTWHENWRAPPED
AROUND CLUTCH.
INNERSURFACESHOULD BE
SMOOTH AND UNDENTED.
FLANGEMUST NOT WOBBLE
ON SHAFT.
Figure 9 — Lower Reel Arm Assembly

RADIOCORPORATION OF AMERICA
COMMERCIAL ELECTRONICPRODUCTS , CAMDEN, N.J.
Printed in U.S.A.
DV 564- 567

ADDENDA
to
IB-24693
Instructions for
RCA 400 16MM Motion Picture Equipment)
Use the followingstocknumberswhen ordering re-
placementparts in lieu ofthe numbersgiven on pages
14 and15in IB-24693:
UpperBelt(spring,rewind)Stock No. 215670
Lower Belt(spring,take-up)Stock No. 215671
Lower Reel Arm (completeassem-
bly)Stock No. 215127
RADIOCORPORATION OF AMERICA
COMMERCIAL ELECTRONIC PRODUCTS, CAMDEN, N.J.
Printed in U.S.A. IB-24693-B
DU587

RCA "400"
Simple to Thread
AUDIO-VISUAL PRODUCTS
RADIO CORPORATION
C A M D E N , N.J.
OF AMERICA
FORM 3R2248Re