RCA kcs94 schematic
PHOTO
FACT*
Folder
DISASSEMBLY
INSTRUCTIONS
CHASSIS
REMOVAL
1.
Remove 1 push-on type control knobs
of
cabinet. (Also remove 2 metal
guard.)
2.
Remove 5 clip
cover.
3.
Remove
magnet.
4.
Disconnect speaker
5.
Remove 2 chassis
hex
nuts
6.
Pull
remove
springs
picture tube socket,
at the top
chassis
chassis
holding
part
way out and
the
rest
from
leads.
bolts
of the
rear
ion
from
chassis
way.
screws
bottom
in
remove
from
top
holding plastic
cover. Remove
trap
and
centering
of
cabinet
cabinet.
HV
lead,
panel
rear
and 2
then
RCA
VICTOR MODELS
U,
17-S-6O22,
17-S-6O27, U (Ch.
17-PT-6962,
U,
17-S-6O25,
KCS94,
U,
A)
TUNER
OSCILLATOR
Touch-up
adjustments
circuit
may be
selector
and
tine
PICTURE
To
edge
down
when
PICTURE
For
chassis.
SERVICE
See
SPECIAL ADJUSTMENTS
AGC
If
control until picture shows
stable
TUBE
clean safety
of the
front
and out
bottom
removing safety
TUBE
picture tube removal
(See disassembly
ADJUSTMENT
tube
placement chart
Control Adjustment (Used
receiver overloads
sync.
ADJUSTMENTS
of the VHF
accomplished
tuning
knobs.
SAFETY
glass
remove clamp under
metal trim
of
cabinet).
glass.
REMOVAL
on a
SERVICING
tuner
by
removing
GLASS
CLEANING
and let
safety
Use
extreme caution
it is
necessary
instructions).
LOCATION
on
page
11.
in
VHF-UHF Models only)
strong
signal,
no
sign
of
overloading
oscillator
the
channel
the
bottom
glass
to
remove
adjust
IN THE
slide
the AGC
or un-
FIELD
The
normal setting
position.
HORIZONTAL
The
horizontal hold control (L54)
panel
of the
control.
If
ing
the
horizontal hold,
range
position,
the
horizontal waveform slug
SOUND
IF
To
eliminate sound
detector secondary (A49) located
FUSES
One
fuse
is
(For location
CENTERING
Centering
magnetic
rings
flush
against
around
the
centered.
of the AGC
OSCILLATOR FIELD
chassis
and is
horizontal sync cannot
and
DETECTOR
used
for
see
tube placement
is
accomplished mechanically
around
the
deflection
neck
of the
used
set it at
synchronize
IF
BUZZ
detector
(Bl).
ADJUSTMENT
horizontal sweep circuit protection,
the
neck
yoke.
tube until
control
is at its
ADJUSTMENT
is
located
as a
horizontal hold
be
brought
approximately
the
picture
buzz,
adjust
on top of
chassis.
chart).
by
of the
picture tube, located
Rotate
the two
the
picture
mid-range
on the
control
in by
its
mid-
by
adjusting
the
ratio
adjusting
rings
is
properly
adjust-
two
O
o-
o O
Ji
K>
"The
listing
of any
case a recommendation,
as
to the
parts
have
Inc.,
by the
"Reproduction
G196
available
quality
and
suitability
been
compiled from information
manufacturers
or
use, without
HOWARD
replacement
warranty
of
such
of the
particular
express
or
guaranty
replacement
permission,
W.
SAMS & CO., INC. • Indianapolis
part
herein
does
not
constitute
by
Howard
furnished
type
of
W.
part.
The
to
Howard
replacement
of
editorial
in any
Sams & Co., Inc.,
numbers
of
these
W.
Sams & Co.,
part listed."
or
pictorial
con-
tent,
in any
the
use of the
Sams & Co., Inc., Indianapolis
ternational
Union
(1910)
DATE
5,
Indiana
manner,
is
prohibited.
No
information contained herein. Copyright
Copyright
Union.
by
Howard
patent liability
5,
Indiana,
All
rights
W.
reserved
Sams & Co., Inc." Printed
5-56
U. S. of
America.
under
is
assumed
with
1956
by
Copyright under
Inter-American
in U. S. of
SET
respect
Howard
W.
in-
Copyright
America
315
FOLDER
to
9
WON
VOLUME
CONTROL
12AX4GTA
^
MEASURED
•
MEASURED FROM
(JSEE
VALUE
ARROWS
SET TO
PEAK
1.
DC
12CU6
_ZAS
RftRT
OF
PRINTED
CIRCUIT
ra) (w
5AQ5
5U8
FROM
PIN 8 OF V2.
PIN 7 OF V4.
PARTS LIST
FOR
OR
ON
(CONTROL
PRODUCE
SIGNAL
voltage
voltmeter;
per
volt.
ALTERNATE
APPLICATION
CONTROLS INDICATE CLOCKWISE ROTATION
VIEWED FROM SHAFT
50
VOLTS
PEAK-TO-
AT
PICTURE TUBE
measurements
AC
voltage
measured
taken
D
BOARD
3AL5
END)
with
vacuum tube
a t
1,000 ohms
PRINTED
I
PC-104
PC-IOI
3.
unless
CIRCUIT
PART
CIRCUIT
Measured
values
are
otherwise
voltage
stated,
maintained
4.
Line
OF
from
PRINTED
BOARD
s
at
PC-KD5
,F,L.
STRING,
operation;
*
DENOTES CHASSIS GROUND
FART
OF
PRINTED
CIRCUIT
3CF6
3CB6
!$B?
rtJOri 5X8
-r«
^TO
IOOO
1^
MMF
MMF
no
signal
applied.
v
9VAC
RLAMEMT
CHANNEL
12
MMF
BOARD
PC-102
5AS8
J~6VAC
i
470
@
loop
-T-
T
MMF
J^
*•*
4B07A
CONNECTIONS USED
SELECTOR
£l5)
000
MMF
1000
^^
*T*
T" | MMF
IN
SWITCH
UHF-VHF
SHOWN
470
MODELS
IN
2AF4
CHANNEL 2 POSITION
1000
17AVP
PHOTOFACT
©
STANDARD
How.,d
W.
S.m.
NOTATION
* Co,
Inc. 1956
SCHEMATIC
@B
AFAMP
SUB
SYNC
A
AMP
6CG7
TAKEN
WITH
TUBE
(VIOB)
AND
HEIGHT CONTROL
CENTER
OF
PIN 7 O
SHORTED
ROTATION.
TO
(R4)
GROUND,
SET AT
5 ° !
g
[WID7H
|p
BOOST
. — .
(
«,J%1
600V 1 v
J_
.047
T
@?68K
]
00
NOT
MEASURED
3
TT
®T,™F
3/IOAMP
0101
T'
250V
RCA
VICTOR MODELS
U,
17-S-6O22,
17-S-6O27, U (Ch.
17-PT-6962,
U,
17-S-6O25,
KCS94,
A)
U,
MOIDIA
'SCO9-S-ZL
yn
siaaow
^99)(ciOO)
^97)
(C103)
(C104)(C55)
(C98)
VIEW-CAPACITOR IDENTIFICATION
BOTTOM
CHASSIS
'ZCO9-S-ZI
0
'HD)
yfr6S3>«
(V
yt969-id-/i
7n
'SZO9-S-/L
7n
RF
TUNER-RIGHT
SIDE
PAGE
4
RF
TUNER-LEFT SIDE
ALIGNMENT
INSTRUCTIONS
ESX^Sttto'l^+SSSiSZ
and
kept
Connect
negative
Connect
DUMMY
ANTENNA
1.
0015MFD
2.
»
3.
"
4.
5.
6
7
Two
130S1
8
Carbon
Resistors
Same
instructions
DUMMY
ANTENNA
1
.0015MFI
Ceramic
Capacitor
2.
3
"
4
5
6
away
from
the
chassis.
the
ends
of a
terminal
the
High
Low
High
Low
Across antenna terminals
lead.
lOOOfi
arm to
synchronized
SWEEP
GENERATOR
COUPLING
side
to
point
side
to
chassis.
"
"
side
to
point
side
to
tuner
with
1,31)12
as
under
SWEEP
GENERATOR
COUPLING
High
side
to
Low
side
to
"
"
High
side
to
Low
side
to
chassis.
point
sweep
in
point
chassis.
point
tuner
potentiometer
^> , Set
vo
tage
GENERATOR
FREQUENCY
Not
<££>
.
<^>
.
44MC
chassis
(10MC
each
"Video
IF
<^
.
Not
^>
.
44MC
across a 7. 5 volt
potentiometer
from
the
SWEEP
used
"
"
Swp)
VIDEO
Alignment
SWEEP
GENERATOR
FREQUENCY
used
"
(10MC
Swp)
augment.
VIDEO
IF
arm to
sweep
generator
MARKER
GENERATOR
FREQUENCY
44 . SMC
45.
SMC
43.0MC
47.25MC
42.
SMC
45.75MC
42 . SMC
45.0MC
45.75MC
41.25MC
42.
SMC
45.0MC
45.75MC
IF
ALIGNMENT
Using
Tuner
MARKER
GENERATOR
FREQUENCY
44.
SMC
45.
SMC
43.0MC
47.25MC
42 . SMC
45.75MC
42.
SMC
45.0MC
45.75MC
If
ALIGNMENT
battery
capable
obtain
-3. 5
to the
CHANNEL
Any
unused
channel
4
4
All
VHF
channels
separately
USING
KRK32B
CHANNEL
Any
unused
channel
-
4
4
not
rented,
USING
of
withstanding
volts
horizontal
USE
VTVM.
DC
probe
Common
Vert.
thru
detector
to pin 5
1st.
Video
tube
(V3).
to
chassis.
Vert.
<g>
chassis.
KRK29K/36A
"
USE
DC
<^> . Common
chassis.
Vert. Amp.
thru
to
pin 5 (plate)
1st.
tube
to
chassis.
Vert.
chassis.
the
TUNER
KRK32B
at
Amp.
Amp.
. Low
probe
video
<g>
considerable
point
<A> . Connect
input
of the
CONNECT
SCOPE
to
point
to
chassis.
"
of
scope
(Fig.l)
(plate)
of
IF
Amp.
Low
side
to
point
side
TUNE!
CONNECT
SCOPE
VTVM.
to
point
»
of
scope
detector (Fig.l)
of
IF
amp.
(V3) . Low
Amp.
to
. Low
side
high
voHage
oscilloscope
<§>.
to
UNIT
to
side
point
to
the
ADJUST
Al
A2
A3
A4
A5.A6,
A7
A1.A2,
A3
A1.A3
A1,A2
ADJUST
Al
A2
A3
A4
A5.A6,
A7
A1.A2,
A3
lead
should
current
dram.
positive
for
horizontal
Attenuate
not
more than
for
maximum
Increase
-3
volts
deflection.
Adjust
Clip a carbon
(grid)
to
chassis.
from
plate
video
(trimmer)
separate
marker
Fig.
1.
to
give
Adjust
45.75MC
sponse
42.
SMC
as in
resistors.
pin
5 of
Attenuate
obtain
If a separate
a
marker, couple
of
1st. video
Al, A2 and A3 if
response curve
Increase
and
notice attenuation
Aland
approximately
sponse curve
Slightly readjust
overall
channel
ator loosely
Continue
Attenuate
not
more than
maximum
Increase generator
-3
volts
deflection.
Adjust
Clip a carbon
(grid)
to
chassis.
from
plate
video
(trimmer)
separate
marker
Fig.
1.
ator
to
scope.
with
45.75MC
response
42.
SMC
as in
resistors.
pin
5 of
Attenuate
tain
3 to 5
a
separate
marker,
of
1st.
Al,
A2 and A3 if
sponse curve
be
taped
securely
Connect the
terminal
to
chassis.
deflection.
REMARKS
generator
output
-3
volts
deflection.
••
"
generator
on
bias
of
IF
couple
Attenuate
0. 5 volts peak
A6 and A7 for
as in
marker
Fig.
V3
3 to 5
A3 to set
tilt
as
on
bias
of
IF
couple
Attenuate
give 0 . 5 volts peak
Adjust
marker
Fig.
V3
video
output
VTVM.
Adjust
to
read
-3 . 5
33012
resistor
3rd.
video
IF
Connect a 180(2
to
screen
amplifier
signal
marker
sweep generator
alignment
3rd.
amp.
signal generator
as
couple
(pins
tube
to
minimum
generator
It
loosely
output
at 75% of
Fig.
2.
Adjust
at 70%
2.
Disconnect
Remove
scope
.
output
of
sweep generator
volts peak
signal generator
it
loosely
IF
amplifier
necessary
similar
41.
25MC
30
times
as
shown
Al and A2 to
while switching
In
Fig.
3.
to
first
video
REMARKS
generator
output
-3
volts
deflection.
output
VTVM.
Adjust
to
read
-3.5
330J2
resistor
video
IF
Connect a 180J2
to
screen (pins
tube
(V3).
to
minimum
it
loosely
output
A6 and A7 for
marker
In
Fig.
2.
at 70%
2.
Disconnect
Remove
scope
.
output
of
sweep generator
volts peak
signal
generator
it
loosely
IF
amp.
necessary
similar
to
on
VTVM.
to
for
volts
from
amplifier
carbon
5 and 6) of
(V3).
capacity.
is
to
detector
of
sweep
to
peak
maximum
maximum
A5 to
response
the
and
to
peak
to pin 1
tube
to
to
Fig.
output
at
41.25MC.
marker
down
in
Fig-
from
Couple
IF
with
step
to
on
VTVM.
to
for
volts
from
amp.
carbon
5 and 6) of
Preset
capacity.
is
to
detector
of
sweep
to
maximum
at 75% of
Adjust
response
the
and
to
peak
is
to pin 1
tube
(V3).
to
to
Fig.
maintain
Adjust
maintain
MINIMUM
at
point
pin 2
(V5A)
resistor
Preset
If a
used
for
generator
on
scope.
gain
place
on
180S2
and
detector
on
scope.
Is
used
(V3).
obtain
3.
ten
Adjust
at
with
re-
3.
correct
channel
marker
Amp.
13.
maintain
Adjust
maintain
MINIMUM
at
point
pin
tube
(V5A)
resistor
A5
If a
used
for
gener-
peak
on
maximum
A5 to
on
180S2
and
detector
on
scope.
used
(grid)
Retouch
obtain
3.
<£>
1st.
A5
as in
with
re-
curve
330ft
from
to
for
(grid)
Retouch
times
any
to
gener-
tube
grid.
for
<^>
2
1st.
as in
gain
place
curve
33012
from
to ob-
If
for
a
re-
.
.
SET
315
FOLDER
9
PAGE
5
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