RCA 8pcs41, 9pc41 schematic
PHOTOFACT*
VERT
HORIZ
Folder
VOL
CONT.
HOLD
CONT
HOLD
CONT
POWER
SW.
BRIGHTNESS
CONT
RCA
VICTOR
9PC41A,
-B,
MODELS
-C,
648PTK,
8PCS41,
648PV,
-B, -C,
741PCS
TRADE
NAME
MODEL
8PCS41...
8PCS41-B
8PCS41-C.
9PC41A...
9PC41B.C
648PTK...
648PV
741PCS
MANUFACTURER
TYPE
SET
TUBES
POWER SUPPLY
RATING
TUNING
RANGES
Alignment
Block
Critical
Dial
Disassembly
Optical
Parts List
Pushbutton
Sweep
Photographs
Instructions
Diagram
Lead
Cord
Stringing
Instructions
Barrel
and
Adjustments
Circuit
Audio
Chassis
Cabinet-Rear
Capacitor
Capacitor
Capacitor
Chassis-Top
Chassis-Top
Ident.
Identification
Identification
Dressing
CONTRAST
RCA
VICTOR
TV
CHASSIS
KCS24B-1
.KCS24C-1
.
.
KCS24C-1
KCS24C-1
.
.KCS24D
.
KCS24-1 KRKl-1
KCS24A-1 . KRK1A
KCS24B-1 KRKlA-1
..
.
RCA
Projection
Forty
Forty
110-120
5.1
TV
AM
SW
24
(Radio)
Adjustments
Description
Adjustments
14
View
20
(Horiz.
View
(Horiz.
View
(Radio)
KRKLA-1
KRK4
KRKLA-1
KRK4
KRK4
Victor Div.
Type
One (TV
Nine (Combination
Volts
Amp.
<D
Channels 2 thru
540-1600KC
9.2-16.0MC
7,
(Radio)
24
33
(Model
18,19
26
33
35
Sweep
(Radio)
(TV)
15, 22
Sweep
• 6
CONT
OPTICAL UNIT
KRS20B-1
KRS20B-1
KRS20B-1
KRS20-1
KRS20-1
Radio
Corp.
Television
Only
AC-60
117
Volts
8PCS41)
Chassis)
25
Chassis)
Receiver
Models)
Models)
Cycle
AC
13
24
32
33
CHANNEL
SELECTOR
HORIZ.
DEFL.
KRS20A-1
KRS20B-1
KRS20A-1
of
America,
8,
INULX
9
Camden,
Photographs
Chassis-Top
thru
31
RF
Resistor Ident.
Resistor
Trans.,
Trans.,
Schematic
Schematic
Tube
Tube
Voltage
Voltage
—
li-
FINE
TUNING
HIGH VOLT.
KRS21A KRS2LA KRS21A KRS21A-
KRS21A KRS21-1
KRS21A-
KRS21A-
New
Jersey
(continued)
View
Low
Voltage
Optical
Barrel
Tuner
Resistor
Identification
Identification
Inductor
Inductor
(Radio)
(TV)
Placement
Placement Chart
and
and
Resistance Measurements (TV)
(TV)
Supply
17
20
(TV)
, 5
(Horiz.
(Radio)
(TV)
and
Alignment
and
Alignment
23, 34
2
Chart
(Horiz.
Resistance Measurements
(TV
RADIO
.RK121A
.
RK121A
AUDIO
RS123C
RS123C
RS123C
RS123C
RS123C
RS123A
RS123B
. . RS123C
3
Sweep
Chassis)
25
16, 21
Sweep
chassis)
32
Ident.
(Radio)
Ident. (TV)
Chassis)
10
(Radio)
... 6
4,13
11
23, 34
12
AMP
00
^
in
O
O
-
00
FOR
SERVICE
#31 OR
"The
listing
case a recommendation,
as
to the
parts
have
Inc.,
by the
"Reproduction
RECORD
of any
quality
and
been
compiled
manufacturers
or
INFORMATION
available
suitability
use,
CHANGER
HOWARD
replacement
warranty
of
from
information
of the
without
express
ON
MANUAL
or
guaranty
such
replacement
particular
permission,
RECORD
part
furnished
type
CHANGER
CM-1
W.
SAMS & CO., INC. • Indianapolis
herein
does
Howard
part.
to
Howard
of
replacement
of
editorial
not
W.
The
by
UNIT,
constitute
in any
Sams & Co., Inc.,
numbers
of
these
W.
Sams & Co.,
part
listed."
or
pictorial
con-
SEE RCA
tent,
the
use of the
Sams & Co., Inc.,
ternational
Union
DATE
VICTOR
In
any
(1910)
MODEL
manner,
information
Indianapolis
Copyright
by
Howard
3-50
is
prohibited.
Union.
W.
RP-176
1,
No
contained
1,
Indiana,
All
rights
Sams&
PHOTOFACT
Indiana
patent
liability
herein.
Copyright
U. S. of
reserved
Co., Inc."
under
Printed
SET #25
is
assumed
1950
America.
Inter-American
with
by
Howard
Copyright
in U. S. of
SET
FOLDER
respect
to
W.
under
In-
Copyright
America
90
FOLDER
9
THE
COOPERATION
RECEIVER
MAKES
IT
POSSIBLE
OF THE
A
PHOTOFACT
MANUFACTURER
TO
BRING
YOU
STANDARD
Howard
W.
OF
THIS SERVICE
NOTATION
Saml & Co., Inc.
THIS
1950
SCHEMATIC
PAGE
2
RCA
VICTOR MODELS 8PCS41,
9PC41A,
-B,
-C,
648PTK,
-B, -C,
648PV,
741
PCS
CT)
RCA
VICTOR MODELS
9PC41A,
-B,
-C,
648PTK,
8PCS41,
648PV,
-B, -C,
741
PCS
/VGIA
dOl
SISSVHO
Al
PAGE
4
TV
CHASSIS BOTTOM
VIEW-TRANS.,
INDUCTC
TOR AND
ALIGNMENT IDENTIFICATION
PAGE
13
C27
R20
(R22
L7
)(R17XR16
CIS
C19
C20
R15
R12
TV RF
TUNER-RIGHT
SIDE
TVRF
TUNER-LEFT
SIDE
PAGE
5
RADIO
CHASSIS-TOP
VIEW
PAGE
TRANS..
6
RADIO
CHASSIS-BOTTOM
INDUCTOR
AND
VIEW
ALIGNMENT IDENTIFICATION
When
Remove
Turner
DUMMY
ANTENNA
.05MFD
.
05MFD
.05MFD
Direct
Connect
DUMMY
ANTENNA
Direct
Direct
Remove
lead
to
DUMMY
ANTENNA
Direct
Direct
Direct
Direct
Direct
Direct
Direct
Direct
Connect
DUMMY
ANTENNA
Direct
complete
receiver
local
chassis
High
of
6AU6
to
chassis.
High
of
6BA6
to
chassis.
High
tube
mixer tube.
to
chassis.
the
synchronized sweep voltage
High
tube
mixer tube.
chassis.
AGC
chassis.
High
tube
mixer tube.
to
chassis.
the
synchronized sweep voltage
High
tube
mixer tube.
chassis.
alignment
oscillator
tube
may be
aligned
SIGNAL
GENERATOR
COUPLING
side
to pin 1
(V15).
Low
side
to pin 1
(V14).
Low
side
to
ungrounded
shield
floating
Low
SWEEP
GENERATOR
COUPLING
side
to
ungrounded
shield
floating
Low
tube
6AT6
(V12),
SIGNAL
GENERATOR
COUPLING
side
to
ungrounded
shield floating over
Low
"
"
SWEEP
GENERATOR
COUPLING
side
to
ungrounded
shield floating over
Low
6J6
(Grid)
side
(Grid)
side
over
side
over
side
side
side
TV
ALIGNMENT
ALIGNMENT
(V3)
without
SOUND
to
turn
to
INSTRUCTIONS—
is to be
performed,
to
prevent erroneous indications.
high
voltage supply connected;
SOUND
IF
ALIGNMENT USING
SIGNAL
GENERATOR
FREQUENCY
21.25MC
(Unmod.)
21.25MC
(Unmod.)
21.25MC
from
SWEEP
GENERATOR
FREQUENCY
21.25MC
(450KC
Sweep)
contrast
SIGNAL
GENERATOR
FREQUENCY
21.25MC
(Unmod.)
27.25MC
(Unmod.)
19.75MC
(Unmod.)
21.
SMC
(Unmod.)
25.
SMC
(Unmod.)
22.
SMC
(Unmod.)
25.2MC
(Unmod.)
23.4MC
(Unmod.)
SWEEP
GENERATOR
FREQUENCY
24MC
(10MC
13
"
13
IF
ALIGNMENT USING
the
signal generator
GENERATOR
FREQUENCY
21.25MC
VIDEO
IF
control
13
"
"
"
OVERALL
from
the
signal
GENERATOR
FREQUENCY
22.
SWP)
25.75MC
READ
order
VIDEO
given
DC
Probe
Common
DC
Probe
Common
DC
Probe
Common
FM
SIGNA
to the
CHANNEL
13
DC
Probe
Common
IF
RESPONSE
to the
CHANNEL
13
CAREFUUY
this
AM
CONNECT
AM
CONNECT
to
"
"
"
is
recommended.
removes
SIGNAL GENERATOR
VTVM
to
PoinbQ>
to
chassis.
to
Point<^3>
to
chassis.
to
Point<£>
to
chassis.
horizontal
Vert. Amp.
%£>
chassis.
Vert. Amp.
<J^>
chassis.
SIGNAL GENERATOR
VTVM
to
Point<jj>
chassis.
horizontal
Vert. Amp.
<Q>
chassis.
the
CHANNEL
MARKER
ALIGNMENT USING
to
maximum. Connect negative lead
CHANNEL
generator
MARKER
SMC
INSTRUCTIONS
BEFORE
ATTEMPTING ALIGNMENT
the
high
voltage shock hazard.
AND
VTVM
ADJUST
.
.
.
GENERATOR
input
CONNECT
SCOPE
. Low
. Low
.
CHECK
input
CONNECT
SCOPE
. Low
side
side
side
to
to
A1.A2
Al
A3.A4
A5.A6
AND
of the
to
ADJUST
A7.A8
A9
A10
All
A12
A13
A14
A15
Detune
Adjust
reading will
setting.
Adjust
Adjust
OSCILLOSCOPE
oscilloscope
ADJUST
Point
A3,A4,
to
A5, A6
Point
Al, A2
to
AND
o[ 3
volt
battery
Adjust
Adjust
of the
oscilloscope
ADJUST
Point
to
A 1.
Adjust
for
zero
be
for
maximum deflection.
for
maximum deflection.
for
horizontal deflection.
Adjust
as per Fig 1.
Adjust
straightness
marker
{continue
VTVM
to pin 1 of
for
MINIMUM
for
maximum deflection.
"
for
horizontal deflection.
Check
and
If
necessary
optimum
reading. A positive
obtained
placement
REMARKS
A2 for
maximum
on
either side
REMARKS
for
maximum amplitude
for
maximum amplitude
of
diagonal
at
center
of
step
(V12).
REMARKS
deflection.
response
of
slightly
pattern
5).
Connect positive
REMARKS
shape
markers
retouch
with
6AL5
for
results.
deflection.
and
negative
of the
and
and
line
with
as per Fig 2.
of
response
as per Fig 3.
All
thru
correct
symmetry
21.
25MC
curve
A15 for
*
fcS
£§
oo
O
•O
m
•H
JJJ
>
CO
o*.
~o
IS
si
FIG.I
FIG.2
FIG.
3
PAGE
7
Replace
local
oscillator
Connect a 1000MMF
Reduce
bias
The
The RF and
Connect
DUMMY
ANTENNA
Two
carbon
res.
Remove
DUMMY
ANTENNA
Two
carbon
res.
A.
B.
C.
D.
E.
F.
NOTE
Wave
tuned
in
the
interference.
voltage
sweep generator should
mixer adjustments
the
synchronized sweep voltage
120J!
To
with
each
1000MMF
120S2
To
antenna
with
each lead.
Connect output
Connect
oscilloscope
Connect a 1000MMF capacitor
Turn channel switch
Remove shunt capacitor
Adjust
A38
: In
some
traps
A39 and A40 are
to the
channel having
picture
and
—
capacitor
supplied
SWEEP
GENERATOR
COUPLING
antenna
terminals
120SJ
resistor
lead.
"
capacitor.
SIGNAL
GENERATOR
COUPLING
terminals
120ft
resistor
of
sweep generator
(rear
of
later
models
sound, keeping
tube (V3).
to
and
tuner)
TV
ALIGNMENT
from
first
video
IF
by
battery
be
terminated with
are
noramlly
in
in
Point E thru
from
sweep thru
from
first video
for
response
A38 is a
used
for
the
interference
the
GENERATOR
FREQUENCY
177MC
(10MC
183MC
(10MC
189MC
(10MC
195MC
(10MC
201MC
(10MC
207MC
(10MC
213MC
(10MC
85MC
(10MC
79MC
(10MC
69MC
(10MC
63MC
(10MC
57MC
(10MC
GENERATOR
FREQUENCY
215.75MC
(Unmod.)
209.75MC
203.75MC
197.
191.
185.
179. 7 SMC
87.75MC
81.75MC
71.
65'.
59.
to
cores
grid (pin
to -1
volt.
its
very stable
from
the
signal
SWEEP
SWP)
SWP)
SWP)
SWP)
SWP)
SWP)
SWP)
SWP)
SWP)
SWP)
SWP)
SWP)
SIGNAL
75MC
75MC
75MC
75MC
75MC
75MC
antenna terminals
lOKfi
grid
of
first Video
low
frequency
IF
amplifier
similar
fixed
capacitor
specific types
set
fine
at
approximately
INSTRUCTIONS
RF AND
MIXER
1) to
chassis.
characteristic
MARKER
GENERATOR
FREQUENCY
177.
25MC
179.
75MC
181.
25MC
185.75MC
187.25MC
191.
75MC
193.25MC
197.75MC
199.25MC
203.75MC
205.25MC
209.75MC
211.
25MC
215.75MC
83.25MC
B7.75MC
77.
25MC
81.
75MC
67.
25MC
71.
75MC
61.
25MC
65.
75MC
55.25MC
59.
75MC
OSCILLATOR ALIGNMENT
CHANNEL
13
12
11
10
9
8
7
6
5
4
3
2
MIXER
channels,
to the one
(C21).
of
tuning
output
and
should
generator
WAVE
interference
not be
to the
CHANNEL
7
8
9
10
11
12
13
6
5
4
3
2
CONNECT
DC
Probe
Common
GRID
TRAP
as in RF and m xer
IF to
chassis.
and
and
select a channel with
shunt grid
obtained
In
those
TRAP ADJUSTMENT
and
control until interference
the
same
relative
ALIGNMENT
Keep
leads
of
capacitor
impedance (usually
attemped
horizontal
VTVM
to
to
ADJUSTMENT
of
when
receivers
their
unless
input
of the
CONNECT
SCOPE
Vert. Amp.
^j^in
lOKn.
chassis.
Point<§>
chassis.
second video amplifier grid
first video
to
series
with
Low
side
"
ADJUST
A24.A25
.
A26
A27
A
28
A29
A30
A31
A32,A33
A34
A35
A36
A3?
alignment.
essentially
IF
this
step
may be
alignment will depend
is at
maximum.Adjust
position. Turn
50
ohms).
they
are
oscilloscope
Point
to
grid
was
one
as
short
as
definitely
ADJUST
A16.A17,
A18.A19
A20,
A21,
A22.A23
Adjust
for
reading will
setting. Keep
the
same
Adjust
for
reading will
setting.
reading will
setting. Keep
the
same
flat
response
to
chassis.
shunted.
used
as a
upon
the
A39
core
1/2
turn, adjust
CCONTJ
possible.
known
to be out of
for
horizontal deflection.
Adjust
for
with
markers
curve
as per Fig 4.
Check
for
are
below
readjustment
channel
selector
other
high band
sponse.
Adjust
for
with
markers
Check
for
are
below
readjustments
with
channel
check
other
response.
zero
reading. A positive
be
obtained
A24 and A25
relative
position.
zero reading. A positive
be
obtained
be
obtained
A32 and A33
relative
positions.
with
check
of
correct
type encountered.
and A40 for
adjustment.
REMARKS
flat topped
above 70%. Check for
response
as per Fig 4. If
70% on any
of
A16, A17,
on
that
channels
flat topped
above 70%.
response
as per Fig 4. If
70% on any
of
A20, A21,
selector,
low
band channels
REMARKS
on
either
slugs
on
either
on
either
slugs
markers
above 80%.
mixer
With
minimum
the
other
for
response
as per Fig 4
response
A18 and A19
optimum
as per Fig 4
A22
and A23
channel.
for
optimum
and
negative
of the
correct
and
negative
of the
correct
of the
correct
receiver
markers
slight
re-
markers
Re-
\t
for
channel make
channel. Recheck
for
response
channel make slight
on
that
side
at
approximately
side
side
at
approximately
operation.
the
interference
minimum
with
zero reading. A positive
PAGE
FIG.4
8
All
critical
Alignment
To set
pointer turn tuning
Turn
the
Connect
on
the
schematic.
Volume
insulated
Connect
DUMMY
ANTENNA
21
.
01MFD
22
.01MFD
23
.01MFD
.
01MFD
24
Loop should
Volume
insulated alignment
DUMMY
ANTENNA
.
01MFD
25
26
25MMF
capacitor
in
series
with
a
150SI
car-
bon
res.
27
28
200MMF
200MMF
29
DUMMY
ANTENNA
30
Two
120SJ
carbon
res.
31
32
33
lead
dress
should
be
function
selector
two
matched
control should
alignment
screwdriver
an
output
meter
GENERATOR
High
side
6AU6
(V47).
chassis.
High
side
6BA6
(V42).
chassis.
be
maintained
control should
screwdriver
GENERATOR
High
side
6BA6
(V42).
chassis.
High
side
antenna
terminal "4".
side
to
chassis.
High
side
to
al
"4".
Low
GENERATOR
COUPLING
Across
antenna terminals
"4" and "5"
series
with
Not
used
Not
used
should
performed
cap
switch
100Kn(f
be at
maximum
across
SIGNAL
COUPLING
to pin 1
(Grid)
Low
side
to pin 1
(Grid)
Low
side
in
same
be at
maximum
SIGNAL
COUPLING
to pin 1
(Grid)
Low
side
thru
dummy
antenna termin-
side
to
chassis.
SIGNAL
with
12WJin
each
lead.
"
RADIO
ALIGNMENT
be
performed before alignment.
in the
fully
closed
to
"FM"
1%)
resistors
for
adjusting.
the
speaker
of
to
of
to
relative
for
adjusting.
of
to
to
Low
ALIGNMENT INSTRUCTIONS
INSTRUCTIONS—
order
outlined,
and set
pointer
(maximum
in
series
position.
Output
voice
coil.
SIGNAL
GENERATOR
FREQUENCY
10.
7MC
(30%
400
position.
SIGNAL
GENERATOR
FREQUENCY
455KC
(400 1 ModJ
15.
SMC
9.
SMC
1400KC
600KC
SIGNAL
GENERATOR
FREQUENCY
106MC
88MC
106MC
90MC
mod.
1-
AM)
position
FM
(max.
CW)
to
Output
"C"
second
pos.
CCW)
"A"
(third
pos.
CCW)
SWITCH
FM
READ
If an y
portion
of the set is
to
last
reference
FM IF
clockwise).
from
point
F to
of
signal
generator
BAND
SWITCH
POS.
chassis
of
BAND
SWITCH
POS.
band
band
BAND
POS.
RADIO
SETTING
Tuning
fully
closed
AM
ALIGNMENT
as
when
signal generator should
RADIO
SETTING
Tuning
fully
open
15. 5MC
9.
SMC
1400KC
600KC
RF
ALIGNMENT
fk
RADIO
SETTING
106MC
88MC
106MC
90MC
CAREFULLY
mark
ALIGNMENT
chassis.
should
DIAL
gang
receiver
DIAL
.
gang
DIAL
BEFORE
ATTEMPTING ALIGNMENT
aligned, perform
at low
frequency
The
junction
of
be no
higher than
CONNECT
VTVM
DC
Probe
to
PoinK£> . Common
to
chassis.
DC
Probe
to
Point<§>.
Common to
point^p
DC
Probe
to
Point<4j>>.
Com-
mon
to
chassis.
is in
cabinet.
be no
higher than
OUTPUT
METER
Across
voice
coil
Across
voice
coil
CONNECT
VTVM
DC
Probe
to
Point<^ . Common
to
chassis.
these
•
all
end of
steps
dial.
two
necessary
ADJUST
A41
A42
A43
A44,
A45,
A46,
A47,
A48,
A49
necessary
ADJUST
A50,
A51,
A52,
A53
A54,
ASS,
A56
A57,
ASS,
A59
A60,
A61,
A62
A63,
A64,
A65
ADJUST
A66,
A67
A68,
A69
A70
A71
after that
portion.
resistors
is
alignment point
to
obtain
an
output
Connect a 680S2
"D"
and
flection.
Remove
reading. A positive
will
be
setting.
as
zero
towards
A39
should
Adjust
meter connected
mum
output
not
occur
A40,
it may be
A40
simultaneously until
output
the
same
680ft
resistor.
Alternately
of
each transformer while
of
the
Adjust
to
Alternately
of
each
while
former
imum
Adjust
generator
A
signal should
the
signal generator
to
the
Adjust
generator
A
signal
is
incorrectly
steps
Adjust
Adjust
28
and 29
be
made.
Adjust
Adjust
are
noted,
out.
Repeat
improvement
Adjust
If
two
largest
Adjust
If
two
farthest out.
no
further improvement
resistor
"E"
of
L46.
the
680S2
obtained
on
The
voltage
is
approached. A slow approach
zero
indicates
be
turned
for
MINIMUM
and
zero
at the
same
necessary
and
zero
voltage
point. Repeat
Remove
load
the
same transformer
for
maximum deflection.
obtain
an
output reading.
load
the
transformer
the
opposite
is
being adjusted.
output.
for
maximum output. Tune
to
16.41MC
be
next peak
and
for
maximum
to
10.
41MC
should
be
aligned,
26 and 27.
for
maximum output.
for
maximum output. Repeat
until
no
for
maximum deflection.
for
maximum deflection.
use the one
steps
can be
for
maximum deflection
peaks
are
noted
capacity.
for
maximum deflection (noise
peaks
are
noted,
Repeat
H as
shown
reading.
Use an
REMARKS
between
Adjust
resistor.
and
either
should change
in the
output
across
voltage
primary
REMARKS
primary
with a lOKfi
side
and
heard.
to
recheck
output.
and
heard.
further improvement
REMARKS
30 and 31
made.
steps
terminals
for
maximum
Adjust
negative reading
side
of the
severe
detuning
opposite
on the
voice
coil.
on the
settings
of A39 and
to
adjust
minimum
on
VTVM
occur
step
21
omitting
the
output
and
secondary
the
opposite
is
being adjusted.
Use an
and
secondary
resistor
of the
same
Adjust
for
increase
If it is
not,
15.
SMC
and
for
image.
Tune
increase
If it is not the set
therefore
repeat
If two
with
the
slug
until
no
(noise
use the one
use
the one
with
32 and 33
can be
made.
for
zero
correct
rapidly
direction.
output
If
mini-
VTVM
A39 and
audio
meter.
side
trans-
max-
the
signal
the
output.
reset
open
the
signal
the
output
steps
peaks
farthest
further
voltage)
with
the
voltage)
the
until
and
at
the
can
de-
do
A51
.
slug
PAGE
9
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