RCA 400

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11

TROUBLE

LOCATION

AND

REMEDY

CHART

Description

of

Trouble

a.

Loses lower loop

b.

Picture

motion

unsteady

c.

Picture

indistinct

or

illumination

low

d.

Film

being scratched

e.

Sound

weak; picture

normal

f. No

sound; picture

normal

g. No

picture; sound

normal

h.

Reproduction noisy

i.

Sound

on

MIC;

no

sound

from

film

Possible

Cause

(1)

Dirty

aperture plate

(2)

Defective

film

(1)

Loss

of

loops

(1)

Dirty projection lens

(2)

Dirty

condenser

lens

(3)

Projection

lamp

black

or

blistered

(1)

Film

pressure

shoe dirty

(2)

Sound

pressure roller dirty

(3)

Aperture

plate dirty

(1)

Volume

control

not set

properly

(2)

Microphone

plug

in

jack

(1)

Amplifier

ON-OFF

switch

in OFF

position

(2)

Microphone

plug

in

jack

(3)

Loudspeaker

not

connected

(4)

VOLUME

control

not set

properly

(5)

Sound

lamp

burned

out

(1)

Projection

lamp

out

(2)

LAMP

switch

OFF

(1)

Back edge

of

sound

drum

dirty

(2)

Dirty

film

(1)

Sound

lamp

burned

out

Remedy

Clean

Cut

out

defective part

and

splice

Restore loops

Clean both ends

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). If the

lamp

burns

out

during

a

show,

turn

OFF the

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

up the

wide

and

narrow

flanges

on

its

base

with

the

mating

socket

slots

and

insert

the

lamp.

Press

the

lamp down

and

turn

it

clock-

wise

until

it

"clicks"

into

place.

Avoid

getting

fingerprints

on the

clear

portions

of the

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

lamp with

the

left

hand

as

shown,

lift

it

slightly

and

turn

it

counter-

clockwise

to

disengage

the

socket

pins.

To

install

the new

lamp,

line

up the

notch

in its

flange

with

the

small

hole

in the

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

on the

operating

side

of

the

projector.

To do so,

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

cap and the

grid

connection

wire.

Then

grasp

the

body

of the

tube

firmly with

the

thumb

and

first

or

second

finger.

Moving

slightly

from

side

to

side,

pull

the

tube

straight

outward

from

its

socket.

Then

tilt

the top

of

the

tube

upward

to

allow

the

large

diameter

of

the

tube

to

clear

the

box-shaped

housing

for the

microphone

jack.

It may be

necessary

to

rotate

the

tube

while

tilting

it to

completely

clear

the

box.

4.

Fuse.

The

"Senior"

model amplifier

includes

a

fuse mounted under

its

chassis

to

protect

its

power transformer

in the

event

of

tube

failure.

To

replace

the

fuse,

remove

the

rear

portion

of the

projector

case

by

removing

its

nine mounting

screws.

Do not use a

larger

rated

fuse than

speci-

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