RCA ctc4 schematic
PHOTO
FACT*
Fold
er
RCA
VICTOR
21-CT-661U,
21-CT-664U
MODELS
21-CT-66OU
21-CT-662U,
(Ch.
CTC4,
21-CT-663U,
CTC4A)
RCA
TRADE
NAME
MANUFACTURER
TYPE
TUBES
POWER SUPPLY
TUNING
Alignment
Block
Drive Cord Stringing (UHF)
Disassembly
Miscellaneous
Parts
Photographs
"The listing
case a recommendation, warranty
as
to the
parts have been compiled from information furnished
Inc.,
by the
"Reproduction
G154
RCA
SET
Color
Twenty-six
RANGE-Channels 2 thru
Instructions
Diagram
List
and
Cabinet-Rear
Capacitor Identification
Chassis-Top
Convergence
Printed Circuit
of any
available replacement
quality
and
manufacturers
or
use, without
Victor Models 21-CT-660U, 21-CT-661U,
Radio Corporation
Television
HO-120
Instructions
Adjustments
suitability
Volts
5
3
33
Descriptions
View
33
View
14, 15
Chassis
31
Sub-Chassis
HOWARD
or
guaranty
of
such
of the
particular type
express
Victor Model 21-CT-662U
of
Receiver
AC-60
13
31
20, 29
22
12, 17
(Sound
W.
part
herein
by
replacement part.
of
permission,
(Ch.
CTC4A)
America,
Cycles
VHF,
RCA
Victor Television Division,
RATING
14
thru
83
UHF,
Video
21-CT-662U,
IF 45.
21-CT-663U,
3. 6
75MC,
Camden,
Amp. @ 117
Sound
INDEX
thru
9
thru
IF) 10
SAMS & CO., INC. • Indianapolis
does
not
constitute
Howard
W.
The
to
Howard
replacement part listed."
of
editorial
in any
Sams & Co., Inc.,
numbers
of
W.
Sams & Co.,
or
pictorial con-
27
these
Photographs
Resistance
Schematic
Schematic
Schematic
Tube
Tube
tent,
the
Sams & Co., Inc., Indianapolis
ternational
Union
DATE
(Cont)
Printed Circuit Sub-Chassis
RF
Tuner
21,28
Resistor
Identification
Resistor
Identification
Trans.,
Inductor & Alignment
Measurements
(Alternate Convergence Circuit)
(TV)
2
(RF
Tuner)
Placement Chart
Placement Chart (Top
in any
manner,
is
use of the
(1910)
prohibited.
information contained herein. Copyright
Copyright Union.
by
Howard
4-56
21-CT-664U
N. J.
IF
4L
25MC
(R1-R142)
(R143-R232)
4
30
(Bottom
View)
View)
5,
Indiana
No
patent
5,
Indiana,
All
rights reserved under Inter-American Copyright
W.
Sams
8.
(Ch.
CTC4
or
CTC4A)
Volts
AC
(Intercarrier)
(Video
IF) 10
11, 18
13, 16
Identification
9
19
liability
U. S. of
Co., Inc." Printed
32
29
is
assumed
with
1956
by
America. Copyright under
Howard
in U. S. of
SET
314
respect
America
to
W.
in-
FOLDER
9
PAGE
2
A
PHOTOFACT
STANDARD
©
Howard
W.
Strm & Co.,
NOTATION
Inc. 1956
SCHEMATIC
®/u|
i
500
,
MFD
40
SOURCE
2
MFD
©1
f\SOURC
\)
\L < '
>
©
DAMPER
6BL4
HORIZ.
@
LINEARITY
HV
TRANSFORMER
VIEWED
HV
TRANSFORMER TERM. BOARD
VIEWED
FROM
FROM
BOTTOM
TOP
TERM.
REAR
OF
OF
BOARD
CHASSIS
NO. I
CHASSIS
NO.2
V
^
^
o
S3
C
K)
n
F
r
2
-
c
RCA
VICTOR
MODELS
21-CT-66OU,
21-CT-661U.21-CT-662U,
21-CT-663U,
21-CT-A64U
(Ch.
CTC4,
CTC4A)
-
'
1
^^
-
J
"1
FOCUS
VDH
S13QOW
DIAGRAM
BLOCK
ynO99-13-LC
1C
99-13-
'
'ni
(VtOlD
Item
V 1
V
2
V
3
V
4
V
5
V
6
V
7
V B
V9
V
10
V 1 1
V
12
V
13
V 1 4
V 1 5
V
1 6
V
17
V
1 8
V
19
V
20
V
21
V
22
V
23
V
24
V
25
V26
V27
Tube
6AF4A
6BQ7A
6X8
6AZ8
6AZ8
6AN8
6CL6
6CL6
6U8
6U8
6T8
6AQ5
6AQ5
6SN7OT
6CB5
6BL4
1X2B
3B2
6BK4
6AZ8
6AL5
6AN8
6AZ8
6AG7
12BH7
21AXP22
*t
t 2.
on
t
7Kn
t
7Kn
• 2.
goon
loon
J
24Kn
INF
eooKn
2.
1.
t
iiKn
t 3.
30Mee
8Kn
t
11KS1
.2n
t
5Kn
1
on
T
28Kn
t
iiKn
PIN 10
NC
RESISTANCE
Pin
1
8Kn
20Kn
sooKn
5KH
lOOKn
t
7Kn
t
7Kn
2Meg
3Meg
4.
2Kn
50Kn
•
25Kn
47Kn
27Kn
25Kn
soon
2Meg
t
1.
soon
.in
sn
NC
30M6E
PINJL
t
iiKn
t
iiKn
. 2n
27Kn
t
47Kn
5Kn
on
2.
2Kn
t
noKn
.W™270Kn
»
t
•
.
NC-NO CONNECTION.
TP-TIE
3Mee
MEASUREMENTS
Pin
2
Pin
3
Pin
4
on
eooKn
.in
on
ti4Kn
68
S!
.in
6
en
on
ti2Kn
t
i5Kn
tsoon
.
1.
INF
on
on
230Kn
zoon
200Kn
NC
1-8
8Kn
on
.in
5
eon
. 4n
on
on
.
130-2
PIN 12
t
130Kn
MEASURED
MEASURED FROM POSITIVE SIDE
MEASURED FROM 130V LINE.
MEASURED FROM
POINT.
.in
.in
.in
.IS!
.in
8KS1
.in
.in
.in
.in
250Kn
470Kn
NC
30Mee
HAVE
8Kn
.in
on
on
.in
eon
.in
70Kn
t
fT™
IN
"UHF"
PIN 3 OF
m
INF
9«n
POSITION.
on
.in
on
on
on
on
on
on
on
on
t
t
470IO!
t 3.
SOMee
1.
on
2.
.in
on
22on
.in
t 5Kn
PIN 14
t
VI6.
. .
Pin
5
90
OS!
39Kn
sn
2Meg
5Meg
iucn
OF Cl.
—
Ji
.RESJSTANC
Pin
8Kn
eooKn
on
85KO
35Kn
•
470n
t 5.
5Kf!
250KS!
.
i.
250
Kn
t
470n
t 2.
OS!
20on
NC
SOMee
NC
560Kn
on
t 2.
47Kn
t
iiKn
t
28Kn
'1104
6
5Kn
8Kn
SKn
|on
mn
70Kn
Pin
7
»t
20Kn
250Kn
lOOKn
I2on
on
•
470n
on
on
2
SKn
I2on
on
600KS!
2.
2Mes
.in
on
t 2n
TP
E
t
iiKn
1.
8Meg
t
20KO
2.
7Kn
.in
2.
2KS!
.130-270Kn
Pin
i2on
ii9Kn
.
4Mee
•
11KS1
.2n
t
i2Kn
lisxn
s.sn
1.
2KS!
lOMeg
on
t
iiKn
T
2n
SOMeg.
SKn
t
20Kn
2Meg
t
i5Kn
t
1.1KSJ
on
NC
8
Pin
9
on
t
i9Kn
1.
6Meg
33Kn
ison
4.
2Kn
50Kn
2.
2Mee
1.
8M6E
t
330KS!
TOP CAP
.
eon
TOP
CAI
.
80Kn
TOP CAP
.
57on
TOP CAP
INF
3.
SMeg
470n
t
eoKn
on
SOMeK
PAGE
4
The
high
•
watt
resistor
Ground
Connect
<C)
as
DUMMY
ANTENNA
.01MFD
"
Use
frequency modulated
Ground
DUMMY
ANTENNA
.
01MFD
Connect
Ground
Connect
DUMMY
ANTENNA
.01MFD
Connect
ungrounded
Adjust
Connect
The
sweep
DUMMY
ANTENNA
0015MFD
5.
Ceramic
Capacitor
"
6.
"
7.
8.
..
9.
"
10.
11.
12.
voltage
pin 8
two
shown
pin 8
the
pin 8
the
the
for -3
the
matched
High
of
tube
chassis.
High
of
(V7).
chassis.
High
of
tube
chassis.
side
generator
High
Low
High
Low
chassis.
short
should
from
pin 7 of
(grid)
of 3rd
100K!Z(+1%)
on the
schematic.
SIGNAL
GENERATOR
COUPLING
side
to pin 2
first
video amplifier
(V7) . Low
(grid)
of 3rd
SWEEP
GENERATOR
COUPLING
side
to pin 2
first
video
Low
side
negative
lead
(grid)
of 3rd
synchronized
SWEEP
GENERATOR
COUPLING
side
to
pin 2 (grid)
first
video amplifier
(V7) . Low
negative lead
of
C76.
volts bias
synchronized
output
SWEEP
GENERATOR
COUPLING
side
to
side
to
chassis.
"
"
"
side
to
side
to
tuner
(Use
shielded
be
disabled
deflection yoke
Video
IF
resistors
(grid)
Bide
to
signaL
with
Video
IF
(grid)
amplifier
to
of a 7
Video
sweep
side
to
of a
variable bias
Connects
at
point
sweep voltage
lead
point
<|>
point
<f>
very
leads)
.
ALIGNMENT
by
Amp. Tube
SIGNAL
GENERATOR
FREQUENCY
4.
SMC
(Unmod)
SOUND
60^
Amp. Tube
SWEEP
GENERATOR
FREQUENCY
4.5MC
(450KC
volt
bias
IF
Amp. Tube
voltage
SWEEP
GENERATOR
FREQUENCY
Not
used
second bias
<g>
.
should
SWEEP
GENERATOR
FREQUENCY
.
Not
used
.
44MC
(10MC
ALIGNMENT
INSTRUCTIONS—READ
removing
the
fuse (M5)
socket
(B+
SOUND
in
series
modulation
Swp)
supply
from
supply
from
be
terminated
"
"
"
"
"
Swp)
line)
IF
ALIGNMENT USING
(V6A)
to
chassis.
from
point
CHANNEL
Any
IF
ALIGNMENT USING
and
450KC sweep.
(V6A).
MARKER
GENERATOR
FREQUENCY
4.
SMC
to
point
d^ . Connect
(V6A)
to
the
the
chassis.
sweep generator
MARKER
GENERATOR
FREQUENCY
4.5MC
(400Ulod)
to the
ungrounded
supply
(steps
sweep generator
with
MARKER
GENERATOR
FREQUENCY
45.0MC
42.0MC
43.9MC
39.75MC
41.25MC
47.2BMC
42.17MC
42.75MC
45.75MC
42.17MC
42.75MC
45.0MC
45.75MC
in
to
high
<£>
to
DC
probe
Common
DC
probe
Common
DC
probe
Common
CHANNEL
Any
VIDEO
to the
CHANNEL
Any
13 and
to the
its
characteristic
CHANNEL
Any
interfering
channel
"
"
"
"
4
INSTRUCTIONS
CAREFULLY BEFORE
series
with
side
of
vertical
AM
SIGNAL
chassis.
CONNECT
VTVM
to
point
to
chassis.
to
point
to
point
to
point
to
chassis.
FM
SIGNAL GENERATOR
Use
120% sawtooth
Vert.
<&>
chassis.
Vert. Amp.
^3>
chassis.
TRAP
the
positive
horizontal
Vert. Amp. thru
detector (Detector
lead)
pin 1 (plate)
pass
(V20A) . Low
chassis.
VIDEO
IF
ALIGNMENT
side
of
C76,
14),
negative lead
horizontal
impedance, usually
non-
USE
DC
<p> . Common
chassis.
Vert.
detector
lead
pin 1 (plate)
video
(V4A).
chassis.
Vert.
chassis.
ATTEMPTING
pin 3 of the
I
centering
(
GENERATOR
The
junction
ADJUST
Al
<£>.
A2
<B>.
<£$
.
A3,A4
<£>.
CONNECT
SCOPE
Amp.
to
. Low
side
to
• Low
side
ALIGNMENT
lead
input
CONNECT
SCOPE
of
Fig.
3) to
of
amplifier tube
side
Positive lead
to
point
input
of the
CONNECT
SCOPE
VTVM.
probe
to
point
"
Amp. thru
(detector
of
Fig.
3) to
oi
IF
amp. tube
Low
side
Amp.
to
<§>
• Low
side
deflection
of
these
AND
voltage
point
to
point
to
to
chassis.
of the
band-
to
<&> . Positive lead
to
first
to
point
to
ALIGNMENT
yoke
control
(R6A)
AND
VTVM
two
resistors
Adjust
for
output
for -15
Al, A3 and A4.
Adjust
for
reading
will
correct
setting.
as
In
step
then
repeat
Adjust
for
pin
8 of
V6A.
point
<$>
OSCILLOSCOPE
in
scope
ADJUST
A1.A3,
A4
A2
oscilloscope
ADJUST
A5
to
chassis.
oscilloscope
50
ohms.
ADJUST
A6
A7
A8
A9
A10.AU
A12
A13.A14,
A15
A6,A7,
A8
socket.
Connect a 1500
(B-
line).
is
alignment
maximum deflection. Attenuate
volts
on
zero
reading. A positive
be
obtained
Move
1.
Retouch
step 2 .
maximum
Remove
and
chassis.
for
horizontal
Disconnect
Adjust
for
symmetry
Reconnect
Adjust
so
that
crossover
retouch
Al for
straightness
ground from
alignment
with
for
horizontal
Use
high
signal
MINIMUM
ground from
Adjust
for -6
to
for
horizontal
Adjust
for
signal
generator
more than
-6
volts
bias
Adjust
for
signal
generator
on
VTVM
Connect
the
(Fig.
3) to pin 1
pin 6 (plate)
signal
generator
it
loosely
amplifier
tube
to
MINIMUM
for
maximum
at 70% of
maximum
Adjust
A13 to
of
maximum
on
low
frequency
If
necessary,
A15.
Remove
Adjust
sweep
peak
on
scope . If a
ator
is
used
pin 6 (grid)
(V4A) . Check
to
Fig.
5. If
A8
for
desired
obtain
response
point
REMARKS
VTVM
for
final
on
VTVM
A4 for
deflection.
2 -
deflection.
stabilizing
curve
similar
stabilizing
4.
lines
maximum amplitude
of
pin
4001*
pin 8 of
tuner
maximum
-8
volts
at
"
MINIMUM
at
final MINIMUM adjustments.
"
load
V6A
to
pin 6 (grid)
(V4A).
capacity.
gain
place
response
SLIGHTLY
IF
generator
for
of
first
for
necessary,
and
either
side
to
point
<A>
maximum deflection
Remove
IOOKS2
resistors
REMARKS
capacitor
of
maximum
to
Fig.
1.
capacitor
5MC
occurs
as
in
Fig.
2.
crossover
lines.
8 of
V6A . Continue
step 4 .
deflection.
REMARKS
generator
output. Adjust
indication
on
V6A
.
volts
at
chassis.
deflection.
REMARKS
deflection.
output
to
maintain
on
VTVM.
ungrounded
deflection.
output
to
produce 3 volts
leads
of IF
(plate)
of V5A
(6AN8) . If a
is
used
for
of
first
Preset
Adjust
with
45.75MC
response
42.17MC
with
side
of
peak
retouch
test
block.
for 8
separate
marker
couple
video
IF
response
retouch
response.
Exercise
curve
as in
ohm/100
generator
peaking
negative
of the
and
chassis
ground
from
from
(C5).
amplitude
(C5).
at
center
SLIGHTLY
and
Remove
scope.
Remove
Attenuate
not
Maintain
side
of
C76.
Increase
test
block
(6AZ8)
and
separate
markers
couple
video
IF
A13
trimmer
AI4
and A15
marker
as in
Fig.
marker a 50%
42.75MC
marker
as
In
Fig.
AI4
and
volts
peak
signal
gener-
it
loosely
amplifier tube
curve
similar
A6, A7 and
care
Fig.
5.
and
and
of
for
4.
4.
to
to
to
SET
314
FOLDER
9
PAGE
5
DUMMY
ANTENNA
High
1000Q
Carbon
Resistor
in
Carbon
Resistors
minal
holder.
chassis.
series
with
short
.
0015
MFD
ceramic
capacitor
Two
1300
Across
terminals
each
Remove
VHP
Fig.
5-
SLIGHTLY retouch A16,
The
antenna
new
antenna unit
The FM
trap (A55)
Disconnect
the
H
through
(V4)
from
its
Connect
the
negative
ungrounded
side
Adjustment
A19
Connect
the
synchronized
The
sweep
generator
DUMMY
ANTENNA
Across
Direct
minals.
chassis.
»
Across
Two
130ft
minals
Carbon
Resistor*
lead.
A
tuner
jnit
alignmer
t
is
Preset
A
23
D
is
conn
e
ct the
Connect
a 56 ohm
Tuner
al
ignment
Short
tun
er
Connect
the
The swe
DUMMY
ANTENNA
NOTE:
If
channel 8 oscillator
frequency.
13
oscillator
TW0130S2
Carbon
Resistors
Connect
the DC
21
until proper
Two
300f
Carbon
Resistors
SWEEP
GENERATOR
COUPLING
side
to
front
of
1N82
Low
(Use very
leads).
antenna (VHF)
with
lead.
sweep
generator
unit
has
been properly
is
installed,
may be
lead
from
a .
001MFD
socket.
The
lead
of
C76.
thru
A22 are
output
SWEEP
GENERATOR
COUPLING
antenna ter-
Low
antenna ter-
with
130ft
which
is
operative
necessary
make
all the way
out.
link
from
carbon
as
outlined
AGC
to
chassis
synchronized
SWEEP
GENERATOR
COUPLING
RF
Input heterodyne
quency
meter
insulated
wire
provided
for
of
A26.
Exercise
that
the
wire
touch
any
tuned
causing
oscillator
Switch back
frequency. Repeat until
Across
antenna ter-
minals
with
1300
each
lead.
probe
response
Across
antenna ter-
minals
with
300ft
each
lead.
ter-
crystal
side
to
1300
In
and
the RF
aligned
L15
(point
capacitor
matching
of a
variable bias
adjusted
sweep
voltage
lead
should
side
to
In
each
and
the
Set
terminals
resistor
below
and
sweep
fre-
to end of
in
hole
adjustment
care
does
not
circuit
drift.
frequency
to
In
of
VTVM
Is
obtained.
in
SWEEP
GENERATOR
FREQUENCY
650MC
h
(10MC
Swp)
44MC
(10MC
Swp)
connect
UHF
A17 and A18 to
aligned
at the
unit
should
wUhout.adversely
<g> ) to
the
to pin 6
(grid)
unit
cover must
supply
by
expanding
from
the
be
terminated
SWEEP
GENERATOR
FREQUENCY
Not
used
52MC
(10 MC
Swp)
requires
only
following
adjustments:
channels
7 to 13
of L58
(converter
from
point
<g>
requires
the use of a
point
<m
.
voltage
from
the
SWEEP
GENERATOR
FREQUENCY
Not
used
cannot
channel
8 and
proper
IB
SMC
(IOMC
Swp)
to
point
<T> . Common
213MC
(IOMC
swp)
VIDEO
GENERATOR
FREQUENCY
sweep
correct
factory.
be
realigned.
channel
of
second
to the
or
sweep
GENERATOR
FREQUENCY
45. 7 SMC
(400'iiMod)
41.
50MC
52MC
53 MC
60MC
minor
oscillator
to
sweep
GENERATOR
FREQUENCY
Set
be
reached
adjust
IF
ALIGNMENT
MARKER
42.
17MC
42.
75MC
45. OMC
45.
75MC
generator
any
ANTENNA
The RF
affecting
selector
video
be in
place
ungrounded
compressing
generator
with
its
MARKER
25MC
VHF
touch-up
slugs
plate
transformer)
chassis,
heterodyne
generator
MARKER
freq.
meter
to
227 MC
by
A23 for
frequencies
181. 2 SMC
185.75MC
to c
211.25MC
215. 7 SMC
(Cont).
CHANNEL
Between
Vert.
channels
43
Check
all
channels
overall
the
switch.
IF
during
characteristic
CHANNEL
Any
and 44
VHF
to
antenna
tilt.
MATCHING
unit
is
unit.
Use a
amplifier
alignment.
side
coil turns.
to the
aligned
of
horizontal
detector (detector
lead
junction
resistor
MFD.
Low
Vert. Amp.
chassis.
terminals.
Disconnect generator
tube
C76,
impedance,
Vert.
point
to
••
Vert.
detector (detector
lead
point
side
TUNER
ALIGNMENT
adjustments
one
CHANNEL
adjustment
channel 8 oscillator
are
8
lassis.
13
turn
frequency
to the
8
obtained
Adjust
will
from
and
shunt
meter.
horizontal
Not
of
A25,
and no
Vert.
chassis.
A24 for
Vert.
chassis.
CONNECT
SCOPE
Amp. thru
of
Fig.
3)
of
180ft
and .
(See remarks)
side
to
chassis.
to
<§>
. Low
side
Check
UNIT
ALIGNMENT
with a particular
short
jumper
(V5A).
Remove
Positive
input
of the osc
usually
CONNECT
SCOPE
j4mP-
t°
<§>
. Low
chassis.
»
Amp. thru
of
Jig.
3) to
^p . Low
to
chassis.
require
tight.
the
terminals
input
CONNECT
SCOPE
used
switch
to
frequency.
changes
Amp.
to
<^
. Low
side
-3.5
Amp.
to
<£>
. Low
side
to
0015
point
to
Lo
lead
side
no
pre
of the o
channel
are
point
to
volte
point
to
ADJUST
A16, A 17,
A18
A6,A7,
A8
all UHF
and
antenna
connect
the
to
chassis.
lloscope
50
ADJUST
A19
A20
A2LA22
setting
with
sciHoscope
50
ADJUST
A24,A25
A26
Switch
noted.
A26,A39
A40
at
point
Set
resistor
amic
chassis.
Connect a second
Positive
bias
loosely
sweep
on
with
Fig.
at
peak
tilt
proper bandwidth, adjust
L55
coil
MFD
Couple
video
curve
SLIGHTLY
sary
step
channels
bias
supplies.
matching
output
of
first
video
Adjust
for
ohms.
Adjust
scope.
Remove
to
grid
carbon
Use
for
for
Repeat
improvement
of
curve
maximum
tortion
harmonic
a (FM
adjusting
ments return
Restore connection
switch.
of
adjustments.
a 39 ohm
for
ohms.
Preset
The
are
maximum.
clockwise.
frequency
until
turn
ion. Return
mechanical center
13 and
adjust
to
channel
Couple
terminals
gain
output
produce
response
frequency
Adjust
response
<T> . Repeat
A41,A42
Adjust
Turn
jection
22.
generator
recheck
retouch
REMARKS
tuner
to UHF
position.
in
series
capacitor
at
scope.
45.75MC
6.
of
curve.
is
turns.
capacitor
IF
similar
to
12.
for
matching
IF
horizontal
very
maximum output. Adjust
response
carbon
horizontal
limits
2.5
beat
one
A27 for
13 and
for
off
If
with a .0015MFD
between point
Capacitor
end
connectto
bias
to
chassis.
<^ . Couple
for
.5
A16 for
and
42.5MC
A17 to
(Fig.
6).
by
expanding
Remove
180ft
from point
generator
grid.
to
Fig.
retouch
A6, A7 and A8
for any
similar
in
place*
unit
at
point
tube
volts
at
deflection.
REMARKS
capacitor
from
point
lead.
Set
curve
similar
16, 17 and 18
Is
noted.
point).
at
is
sweep
generator
for
maximum
thru A22.
A55 to its
from
V4 in its
When
complete
deflection.
REMARKS
to
read
-3.5
of
oscillator
minimum
Set
fine
tuning
Adjust
A25 for
Adjust A 23
begins
in
same
fine
tuning
of
channel
13
readjust
A27 for
generator
to
provide
markers.
and
minimum
signal
pattern
to
Fig.
bandpass,
place
markers
A26
19, 20 and
response
curve
and
<T>
using
To
adjust A24, turn sweep
and
signal
13
response.
supply
3).
volts
place
If
necessary,
resistor
Check
5 on
overall
If a
400^
A21
Adjust A 22
53MC
affected
After
original
L15 to
injection voltage
and
control
its
range.
oscillator
attenuate
on
A40
also
check
generator
desired
lead
point
to
detector (Fig.
generator
Adjust
Adjust
of
curve . Adjust
adjusted
marker
amplifier
correct
response
unit
amplifier
for -6
for
MINIMUM
.001MFD
of
V5A. Connect a 300ft, i watt
resistor
short
steps
(52MC
response
of
response
of
trap)
A19
Replace
resistor,
A24
volts
meter.
note Just
full turn
signal
maximum
for
usable
similar
of
A26 to
curve.
steps
for
generator
at
point
necessary
channel
A41 and A42 for
Connect a 180ft
cer-
<£>
and
point
to
point
Adjust
maximum
A18 for
L55 (IF
loosely
sweep
socket.
volts
audible
loosely
8. A39
<S>
for -3
marker
generator
Attenuate
peak
to
peak
gain
markers
as
45.75MC
marker
MINIMUM
to
trap
coil).
or
compressing
and
.0015
^g>
and
chassis.
to
first
for
response
all
VHF
channels.
If
neces-
tilt
as in
to
indication
on
from
point
<^
to
chassis.
generator
A21 and A22
to
Fig.
7.
until
no
further
affects
shoulder
for
point.
If
dis-
by a
second
output, tune
inductance while
final adjust-
position.
channel
at
point
<J>
5.5
volts
control
maximum
beat
on
clockwise
to
change, then
clockwise
direct-
to its
channel
to
antenna
Adjust
scope
generator
input. That
scope.
Adjust
affects
affects
tilt.
at
100%
on
affects bandwidth.
similar
to
Fig.
oscillator
VTVM
as
in
step
back
on and
If
necessary
response.
^^
.
volts
In
obtain
<TO
"
will
for
8.
in-
ALIGNMENT
.
TO
SCOPE
.
.
FIG.
I
-L.OOI5
-T-MFD
F
IG.4
FIG.6
F
IG.8
F
IG.IO
FIG.
INS
IN34
,
y
\|
S47K
3
PAGE
6
tor
to
1015
narks)
assis.
•
point
de
to
;heck
all
•ator
and
rticular
er to
connect
Remove
lead
to
"
the
oscilloscope
sually
50
no
presetting
inals
with
jf
the
oscilloscope
usually
o
channel
icy.
Switch
;es
are
noted.
)
point
le
to
raits
at
o
point
Ide
to
A16,A17,
A18
A6,A7,
A8
UHF
bias
antenna
the
chassis.
ohms.
A20
A21.A22
50
ohms.
A24,A25.
A26
13 and
to
A26,A39;
A40
point
A41.A42
a 39 ohm
Set
tuner
resistor
amic
chassis.
Connect a second
Positive
bias
loosely
sweep
on
scope.
wlth45.75MC
Fig.
at
peak
tilt
of
proper
L55
coil
MFD
Couple
video
curve
SLIGHTLY
sary
step
channels
supplies.
matching
output
of
first
video
Adjust
for
horizontal
Adjust
scope.
Remove
to
grid
carbon
Use
for
maximum
for
response
Repeat
Improvement
of
curve
maximum
tortion
harmonic
a (FM
adjusting
ments
Restore connection
switch. Replace
of
adjustments.
carbon
for
horizontal
Preset
The
are
maximum.
clockwise.Adjust
frequency
until
turn
ion.
Return
mechanical center
adjust
channel
Couple
terminals
gain
output
produce
response
frequency
Adjust
response
<1> . Repeat
Adjust
Turn
jection
22.
generator
recheck
retouch
to UHF
position.
In
series
capacitor between point
at
6.
curve.
Is
turns.
capacitor
IF
to
12.
for
matching
IF
very short lead-
limits
2.5
beat
one
A27 for
13 and
for
off
If
with a .0015MFD
Capacitor
end
connectio
bias
lead
point
to
detector
generator
Adjust
Adjust
of
curve.
bandwidth,
adjusted
marker generator loosely
amplifier
similar
correct
response
amplifier
for -6
for
MINIMUM
.001MFD
of
resistor
steps
(52MC
response
of
response
of
trap)
A19
return
A24
volts
note
full
signal
maximum
for
usable
similar
A26 to
curve.
steps
for
generator
at
necessary
channel
A41 and A42 for
supply
to
chassis.
^> . Couple
(Fig.
for
.5
volts peak
A16 for
and42.5MC
A17 to
place
Adjust
(Fig.6).
If
adjust
by
expanding
Remove
180ft
from
point
grid.
to
Fig.
5 on all VHF
retouch
A8, A7 and A8
for any
overall
similar
unit
at
point
tube
volts
at
deflection,
400%
capacitor
V5A.
Connect a 300^, i watt
from
point
Set
output. Adjust
curve
similar
16, 17 and 18
Is
noted.
A21
point).
Adjust
at
53MC
Is
affected
sweep generator output, tune
for
maximum
thru A22.
A55
to its
original
from
V4
In
its
When
complete
resistor.
deflection,
REMARKS
to
read
-3.5
of
oscillator
minimum
Set
meter.
readjust
to
minimum
of
response
point
and
and
fine
tuning control
A25 for
Adjust
just begins
turn
in
same clockwise
fine
tuning control
of
Its
channel
13
oscillator
A27 for
generator
provide
markers.
and
attenuate
signal
pattern
on
to
Fig.
bandpass,
A40
place markers
A26
also
19, 20 and
curve
and
<^
using
To
adjust A24, turn sweep
signal
generator
13
response.
Connect a 180ft
cer-
<£>
and
point
to
point
Adjust
for -3
marker
generator
3).
Attenuate
to
maximum
gain
markers
aa
45.75MC
A18 for
MINIMUM
necessary,
to
L55
(IF
trap
or
compressing
resistor
and
$>
and
chassis.
to
Check
for
response
channels.
If
tilt
as in
to
Indication
from
point
<^
to
chassis.
sweep
generator
A21 and A22
to
Fig.
7.
until
no
further
affects
shoulder
A22
for
point.
If
by a
second
Inductance while
After
final
adjust-
position.
L15 to
channel
socket.
volts
at
point
injection
voltage
5.5
volts
maximum
audible beat
A23
clockwise
to
change, then
to
Its
range.
channel
loosely
to
antenna
Adjust
generator
Input. That
scope.
Adjust
8. A39
affects
affects
tilt.
at
100%
affects
bandwidth.
similar
to
check
oscillator
VTVM
as in
back
If
necessary
desired
response.
<^
<8>
volts
peak
in
marker
obtain
coil).
.0015
first
neces-
on
Op
"
dis-
<t>
on
direct-
scope
will
for
on
Fig.
In-
step
on and
ALIGNMENT
.
.
.
8,
FIG.
F
IG.4
F
IG.6
F
F
I
IG.8
IG.IO
INSTRUCTIONS
DETECTOR
LOAD LOAD
0 O Q
PIG.
3 — IF
TEST BLOCK
FIG.
F
IG.5
52
53 60
FIG.7
F
IG.9
FIG.II
(cont)
2
24
25
26
27
28.
29
30
31
32
33
34
35
36
DUMMY
ANTENNA
Two
300S1
carbon
resistors
Carbon
leslstors
Two
Carbon
Resistors
Reslstort
Two
Carbon
Resistors
Across
terminals
In
each lead.
Connect
meter
Two
130f
Across
nals
with
lead.
If
A24
required readjustment switch
A25
for
proper
oscillator
Across
nals
with
lead.
Connect
as
In
step
Across antenna
nals
with
lead.
Across antenna terminals
with
lead.
tuner thru
curve should
dip.
Always
all
test
Two
Carbon
"
Switch
response
correct
Remove
1300
ISO!)
"
130n
FIG.12
SWEEP
GENERATOR
COUPLING
antenna
with
frequency
as
in
step
antenna
13012
in
antenna
1301!
in
frequency
19.
termi-
120£i
in
"
130ft
in
all VHF
be 85% of
knife
equipment
300n
19.
termi-
each
frequency
termi-
each
meter
each
each
channels
coils
and
GENERATOR
FREQUENCY
163
(10MC
213 MC
(10MC
207MC
(10MC
201MC
(10MC
195MC
(10MC
189MC
(10MC
183MC
OOMC
177MC
(10MC
Not
85MC
(10MC
receiver
as
85MC
(10MC
79MC
(10MC
69MC
(10MC
63MC
(10MC
57MC
(lOMC
Not
Not
183MC
(10MC
213MC
(10MC
85MC
(10MC
and
maximum.
starting
bias
supplies.
SWEEP
MC
used
in
used
used
'•
Swp)
Swp)
Swp)
Swp)
Swp)
Swp)
SWP)
Swp)
Swp)
and
step
19.
Swp)
Swp)
Swpl
Swp)
Swp)
Swp)
Swp)
Swp)
observe
If dip
with
the
MARKER
GENERATOR
FREQUENCY
181.25MC
185.75MC
2U.25MC
215.75MC
205.25MC
209.75MC
199.25MC
203.75MC
193.25MC
197.75MC
187.25MC
191.
75MC
181.
25MC
185.75MC
175.25MC
179.75MC
Freq.
meter
to
129MC
83.25MC
37.75MC
generator
83. 2 SMC
87.75MC
77.25MC
81.
75MC
67.25MC
71.
75MC
61.25MC
65.75MC
55.25MC
59.75MC
Freq.
meter
to
257MC
251MC
245MC
239MC
233MC
227MC
221MC
129MC
123MC
113MC
107MC
101MC
213MC
(400%Mod.)
85MC
(4001Mod)
181.25MC
185.75MC
2U.25MC
215.75MC
83.25MC
B7.75MC
the
response
exceeds
highest
frequency
FIG.13
to
this
CHAN
8
13
12
11
10
9
8
7
6
"
chann
6
5
4
3
2
13
12
11
10
9
8
7
6
5
4
3
2
13
6
8
13
8
on sc
limi
AUCTIONS
FIG.
FOR
LOAD
LOAD
IF
TEST BLOCK
F
IG.5
52
53 60
>4
1
1—
J.
FIG.7
(cont)
2
DUMMY
ANTENNA
24
TWO
soon
carbon
resistors
25
26
27
TwolSOC
Carbon
testators
If
A24
28.
A25
for
29
TwolSOSJ
Carbon
leslstors
30
31
Two
130!!
Carbon
Resistorf
"
32
Two
130n
33
Carbon
Resistors
34
35
Switch
36
response curve should
correct dip.
Remove
SWEEP
GENERATOR
COUP1ING
Across
antenna
terminals
with
in
each
lead.
Connect
frequency
meter
as in
Across antenna terminals
with
13012
lead.
required
readjustment
proper
oscillator
Across
antenna
nals
with
130Si
lead.
Connect
frequency
as in
step
19.
Across
antenna termi-
nals
with
120S1
lead.
"
Across antenna
nals
with
130ft
lead.
tuner thru
all VHF
Always
all
test
equipment
300n
step
in
frequency
termi-
in
In
each
termi-
In
be 85% of
knife
19.
each
switch
each
meter
each
channels
coils
and
SWEEP
GENERATOR
FREQUENCY
183MC
(10MC
213
MC
(10MC
207MC
(10MC
201MC
OOMC
195MC
(lOMC
I89MC
(10MC
183MC
(10MC
177MC
MMC
Not
used
85MC
(10MC
receiver
as in
85MC
(10MC
79MC
(10MC
69MC
OOMC
63MC
(LOMC
57MC
flOMC
Not
Not
183MC
(lOMC
213MC
(lOMC
85MC
(lOMC
and
maximum.
starting
bias
supplies.
Swp)
Swp)
Swp)
SWP)
Swp)
Swp)
Swp)
Swp)
Swp)
step
Swp)
Swp)
Swp)
Swp)
Swp)
used
used
observe
with
Swp)
Swp)
Swp)
and
19.
If dip
the
VHF
MARKER
GENERATOR
FREQUENCY
181.25MC
185.75MC
2U.25MC
215.75MC
205.25MC
209.75MC
199. 2 SMC
203.75MC
193.25MC
197.7SMC
187.25MC
191.
1B1.25MC
185.75MC
175.25MC
179.75MC
Freq.
meter
129MC
83.25MC
37.75MC
generator
83. 2 SMC
87.75MC
77.25MC
81.
67.25MC
71.
61.25MC
65.75MC
55.25MC
59.75MC
Freq.
meter
257MC
251MC
245MC
239MC
233MC
227MC
221MC
129MC
123MC
113MC
167MC
101MC
213MC
(4001,Mod.)
85MC
(4001Mod)
181.
185.75MC
211.25MC
215.75MC
83.25MC
87.75MC
the
exceeds this limit
highest
75MC
to
75MC
75MC
to
25MC
response
frequency
to
CHANNEL
channel
13
12
11
10
9
8
7
6
5
4
3
2
13
6
8
13
6
TUNER
8
13
12
11
10
9
8
7
6
6
5
4
3
2
on
8.
scope,
it
will
(channel
ALIGNMENT
CONNECT
SCOPE
Vert. Amp.
q> . Low
chassis
.
Not
used
Vert.
Amp.
<£> . Low
chassis.
Readjust
A40
Vert.
Amp.
<J>
. Low
chassis.
Not
used
Vert. Amp.
<6>
. Low
chassis.
"
Vert. Amp.
<£> . Low
chassis.
as in
steps
be
necessary
13
thru
(Cont).
ADJUST
to
point
A26,A39
A40
side
to
A34
to
point
A43,
A44
side
to
for
response
similar
to
point
side
to
A27
A28
A29
A30
A31
A32
A33
A34
A35
A36
A37
A38
A45
to
point
side
to
A46
to
point
side
A47
to
A48
"
25 and 29. The dip at
2) and
to
knife
continuing
A49
coils
If
necessary
to
obtain
desired
required adjustment turn
and
switch back
injection
voltage
steps
23 and 24
obtained.
Check
for
response
Check
oscillator
channel
at
point
85%
of
maximum
A26
and A39
curves
within
Set
fine
tuning control
tion.
Adjust
frequency
meter.
Adjust
for
response
Fig.
8.
Check
as
in
step
22.
to
Fig.
8.
Check
for
response curve
Check
oscillator
channel
at
point
85%
on any one
A43
and
A44.
MINIMUM
tilt
colls
(by
expanding
turns)
L39
Adjust
individual channel
for
audible
beat
oscillator
Injection voltage
at
point
<£>
within
( 2
volts
maximum)
limits.
Connect
the
supply
to
ungrounded side
lead
to
chassis.
ungrounded
side
from
tuner
AGC
negative
lead
point
ra> .
Positive
tor
-IS
Volts
maximum
gain.
Indication
on
Reduce
bias
A47
for
maximum
peaks
on
response curve.
Adjust
A48 for
two
peaks
on
by
expanding
RepeatBtepa
point
<^
to -15
and
32.
Then reduce
volts
and
again
Adjust
A49 for
two
peaks
on
mid-point between
L22
thru
L26 and
to the
lowest.
REMARKS
retouch A26,
response(Fig.S).
to
channel
AS
in
step
until
proper
curve
injection
^> . If
markers
on any one
thru
A42 to
proper
limits
to its
A34 for an
audible
curve
oscillator
Readjust
Recheck
thru
to
negative lead
at
to -3
A24
A23 and
Injection
<Q
. If
markers
channel
SLIGHTLY
If
unable
to
on
channels 5 thru 2 knife
or
compressing
L42 and
on
each channel.
verify
that
MINIMUM
Adjust
for -6
of
C76.
Remove
at
point
<fj> . Connect
of a
second
lead
point
^>
Adjust
lor
scope.
volts
at
amplitude between
maximum
response
curve.
or
compressing
33 and
34.
volts. Repeat
bias
repeat
steps
maximum
response
curve
two
peaks
LIT
thru
L20 to
A39 and A40
If A40
off
generators
13 and
check
22.
Repeat
response
is
similar
to
Fig.
voltage
for
each
fall
below
channel retouch
obtain
response
as
in
Fig.
8.
mid-range
posi-
beat
on
similar
to
injection voltage
If
necessary.
similar
to
Fig.
voltage
on
each
fall below
retouch
obtain correct
coil
L47
thru L50.
oscillator
slug
Recheck
on
each channel
the
voltage
and 5. 5
of a
of
bias
to
. Set
MINIMUM
point
amplitude
Increase
at
amplitude between
Is
volts
variable
C76. Positive
volts
at
short
supply
to
chassis.
Adjust
scope
for
4001-
<^> . Adjust
two
between
A48
is
adjusted
coll
turns.
bias
steps
31
point
(K>
to -3
33
and
34
.
on
bias
at
.
8.
8.
F
IG.9
FIG.
F
IG.I2
FIG.13
F
IG.I4
PAGE
7
Turn
the
from
the
center
conductor
a
suitable preamplifier
Fabricate a test
split
gear
stop
pin on the
VHF
marker generator
crystal
Connect
The
sweep
DUMMY
ANTENNA
37
TWO
soon
Carbon
Resistors
38
Tune
39.
thru
to
bend
while
tuning lower
by
touching
quired.
reading
low
or
coupling
outside
oscillator
allowable
Tune
in a
Remove
Connect
Adjust
for -2
Connect a second bias
side
of
DUMMY
ANTENNA
Direct
40
41
42
Direct
43
change over switch
set.
IF and
oscillator
of IF
dial
with
on the
tuner
tuner
should
removal.
Connect
the
synchronized
generator
output
SWEEP
GENERATOR
COUPLING
Across
UHF
terminals
In
the
the RF
Connect
on
high
coll.
this
tube
limits
local
the
the
C76.
Connect
and
lator
terminals.
Connect
ator
modulator
tenna
(See
antenna
with
each
lead.
entire
UHF
plates
in
frequency
the
plates
the DC
VTVM.
Readings between
crystal
Impedance
Connect
range
will
is
replaced
and
In
TV
station
G-Y,R-Y
demodulation
negative
lead
volts
bias
supply
SWEEP
GENERATOR
COUPLING
signal
video sweep modu-
across
antenna
(See
signal
and
video
across
terminals.
remarks-step
to UHF
adjustments
cable
to
chassis
may be
used.
markers scribed
shaft
for
accurate
be
against
thru a lOOOfc
low
side
sweep
voltage
lead
should
SOOn
range
and
to
correct
mlstracklng.
so
with
the
knifing
probe
of
or an
DC
probe
cause
crystal
steps
such
cases,
in
which
of a
variable
at pin 6 of
to the
generator
remark^
gener-
sweep
an-
1)
ALIGNMENT
position.
To
may be
(point
<^>
on
on its
circumference
alignment.
the
stop plate
carbon
resistor
to
chassis.
from
the
sweep
be
terminated
SWEEP
GENERATOR
FREQUENCY
887 . SMC
(Use max.
sweep
473.
(Use max.
sweep
check
that tracking
tool
VTVM
.03 and .4
oscillator
of
VTVM
currents
37 and 38
the
interference
tube
bias
VILA.
ungrounded
SWEEP
GENERATOR
FREQUENCY
SMC
(3MC
width)
SMC
width)
tracking.
while
to
point
to
oscillator
(V25)
supply
Swp)
GENERATOR
FREQUENCY
The
above
noting
<£> . Common
volts
tube outside
point
beyond
should
is
FIRST
from
side
GENERATOR
FREQUENCY
make
the RF
aligned
schematic).
Locate
to
MARKER
41.25MC
43 . SMC
45.75MC
887.
41.
43.
45. 7 SMC
473 . SMC
If the
plates
<£> . Common
repeated,
tube should
noticed,
VIDEO
its
to pin 6 of AGC
of
MARKER
3.0MC
3.58MC
4.
IMC
3.
4.
adjustment
without
at 0, 5 and 164
the "0"
on the
gear assembly
point<J> . Insert
generator
with
its
characteristic impedance,
CHANNEL
83
[164degrees
on
5MC
dial)
25MC
14
SMC
5
degrees
on
dial)
41.25MC
may be
the
point
of
the
effect
should
be
obtained.
its
allowable
allowable
limits
be
adjust
AMPLIFIER
socket
C76.
Connect
CHANNEL
4
CMC
IMC
INSTRUCTIONS
UHF
TUNER
ALIGNMENT
removing
If the
oscilloscope does
degree
to the
tuning
tuning
and
45.75MC
bent
by
knifing
on the
response
to
chassis.
to
chassis.
and in
replaced.
FM
TRAP
A55 for
AND
clamper
the
of the UHF
when
resistor
horizontal
Vert. Amp. (thru
preamp.
to
detector
lead
side
chassis.
using a knife
will
If
limits.
If the
ALIGNMENT
minimum
tube
positive lead
Vert.
band
(detector
3).
chassis.
Vert. Amp.
band
tector
of
minal
Low
Vert. amp.
band
detector (detector
lead
terminal
L87.
chassis
Vert. Amp.
band
2MMF
detector (detector
lead
pin 1 (plate)
R-Y
(V25B) . Low
to
tuner,
UHF
tuner.
Connect a lOCXli
not
degrees.
reference
point
Tune thru
voltages outside
such
BANDPASS
di> . thru detector
Low
Fig.
chassis.
The
point
the
plates
are
lead
(insulate
input
of the
usually
CONNECT
SCOPE
if
needed)
<^>
thru
(detector
of
Fig.
3).
Low
to UHF
tuner
markers
blade
not be
disturbed. A check
curve, then
the
entire
This voltage
Readings between
cases
the
oscillator
interference
AMPLIFIER
(6T8/V11A).
to
chassis.
CONNECT
SCOPE
Amp.
of
wide
scope
to
point
lead
of
side
to
of
wide
scope thru
side
scope thru
of
Low
scope thru
of
demodulated
(detector
3).
To
"B"
of
to
chassis.
ofwide
Fig.
"F"
side
.
capacitor
Fig.
3) to
of
L80.
3) to
of
of
ter-
to
side
de-
lead
wide
the UHF
have a sensitivity
with
fully
fall below
with
knifing
this
may be
oscillator
tube
Connect
Fig.
and
(cont)
tuner
carbon
test dial should
the
capacitor
meshed.
lead)
through
oscilloscope
50
ohms.
ADJUST
A50,
Use
A
51,
output.
A52
built-in
generator
provide
A
coupled
similar
MC
marker.
should
response
A53,
Leave
A
54
step
coincides with
If
repositioning
Repeat
are
85% on any UHF
the
shield
cover
of
which
the
proper
UHF
range,
limit
are
obtained,
varied
.75 and 3.5
tube should
is
replaced
in the
picture.
ALIGNMENT
the
positive
Adjust
for -6
ADJUST
Signal
video
crystal
VTVM
to
lation
(67.25MC)
VTVM
being careful
signal
1st, video
45.75MC
lator
control until a beat
scope.
of
similar
Connect a 330S2, 1 watt
A
56
terminals
coll
supply
(V9B) . Connect negative
bias
Connect
Adjust
Adjust
lar to
terminals
to
transformer
Connect
A57,
At
A58
At
-15
curve
SLIGHT
sponse.
and "F" of
Adjust
A59
In
readjustment
step
Replace
unit
will
have
to be
resistor
from
of 5
millivolts
be
made
to fit
plates
Connect
aperture
for
horizontal
low VHF and UHF
If UHF
marker,
50 and A51 for
marker
be
marker
37.
A53 has
steps
obtained.
removed.
requires
section
at the
by
repositioning
volts should
steps
volts
generator
carrier
accuracy.
to pin 2
point
adjust
and
generator
exactly
Remove
V4A.
(L80).
to pin 9
supply
for -7
A56 for
Fig.
terminals
pin
9 of
junction
volts.
similar
A59 for
step
42, if
14 for a
check
with
move
1500^,100
deflection yoke
of
R8A (B-
over
fully
meshed,
the
high
provided
deflection.
REMARKS
sweep
couple
loosely
to
UHF
marker (887. 5MC).
maximum
response
curve centered
to
Fig.
9.
Adjust
coincides with
The
41.25MC
symmetrically
curve
as in
generators
Adjust
A53
473.
SMC
insufficient
coil
until
37 and 38
channel
Knife
knifing
or
both sections
same
time noting
it
indicates
L3
be
be
replaced.
37 and 38
should
lead
to
chassis,,
at
ungrounded
REMARKS
should provide channel
frequency
Connect
(grid)
<!J2> . With
signal
for 1.5
volts
apply video sweep modulation,
not be
loosely
IF
amplifier tube
marker.
To set the
on
frequency
VHF
The
response
to
Fig.
11.
"A" and "B" of
Connect negative
(grid)
to
junction
positive
terminals
volts
at
correct
12.
Remove
"A" and "B" of L80 and
"C"
and "F" of
(L87)
for
both
bias
supplies
V9B
Increase
of
R168
Adjust
A57 and A58 for
to
Fig.
readjustment
Remove
3300
L87.
response
adjustment
for
desired
check
response
fuse
(MS)
in its
watt
socket
line)
.
removed
the
per
inch,
the
The
side
of a
for
marker
generator
generator
has no
separate
antenna
and
Fig.
until
range
it
will
low B+
obtained. Readings
If the
of
zero
generator
overload.
pattern
generator
on
Remove
of
both
adjustments
and
13.
of A7 for
of the
curves
resistor
marker
terminals
Adjust
amplitude
at
887.
A52
until
the
the
887.
SMC
45.75MC
located
on top of
9.
connected
43.
SMC
marker
marker
as in
adjust A 54
markers
coincides.
until
proper
responses
be
necessary
the
plates
may be
made
if re-
the
voltage,
(UHF
osc.
be
repeated.
(67.25MC)
6CL6
on
resistor
burst
of
response
330J2
R169
from
fuse
and
with
DC
probe
(V7).
Common
video sweep modu-
output
VTVM.
Remove
Couple
to pin 6
(grid)
(V4)
to
provide
local
oscil-
adjust
fine
is
obtained
from
scope should
bias
supplies.
across
bandpass
primary
lead
of a
keyer tube
lead
of a
second
R168
and
R169.
of
both
to
bias
points.
curve
resistor
connect
demodulator
In
as in
step
bias
to -9
increase
response
If
necessary,
desired
terminals
similar
to
required
response,
overall
similar
holder.
from
high
side
Fig.
IF
pin
of A7
to
over-
5MC
43.5
markers
as
In
Fig.
by
4
of
VHF
of
tuning
on
pin
6
be
bias
chassis.
simi-
from
step
42.
41.
volts.
bias
make
re-
"C"
14.
repeat
response
to
Fig.
Re-
7 of
10.
to
5.
PAGE
8
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