Emerson 614 User manual

'Emerson Radio
SERVICE MANUAL
MODELS 614-637-644-647
MODEL 614
-•
.
MODEL 644
MODEL 637
MODEL 647
Television Receivers
EMERSON RADIO AND PHONOGRAPH CORPORATION
111 EIGHTH AVENUE
NEW YORK 11r N.Y,

Emerson Radio
Par.
TABLE OF CONTENTS
SECTION 1—GENERAL DESCRIPTION
Page
1 Facilities 3
2 Specifications 4
SECTION 2—INSTALLATION
LIST OF TABLES
Table DESCRIPTION Page
I TubeComplements 3
II ReceiverCharacteristics 4
III AdjustmentsControlSettings 11
IV GeneratorFrequencies_.._ 14
V Audio I-F Alignment 15
VI Video I-F Alignment 16
VII TunerAlignment .-.17
VIII DeflectionWaveformTestPoints 18
\
3
1
2
1
?
3
4
5
6
7
1
?
3
4
•>
6
7
8
ft
in
11
T>
13
SECTION 3— OPERATION
SECTION 4 — CIRCUIT DESCRIPTION
General ...
Tuner
Video Section . _ _ ..
Deflection Section ,. — , _ _
Power Supplies
Intercarrier Sound —
Deflection Yoke and Focus Coil Assembly
SECTION 5— MAINTENANCE AND ALIGNMENT
ChassisRemoval .„
KinescopeReplacement
Mechanical Deflection Adjustments ... ..«___,
Electrical Deflection Adjustments ...
Alignment Test Equipment -
Alignment ... ., . .
Voltage and ResistanceAnalysis ;
Deflection CircuitWaveforms
Production Changes
Secondary Area Reception
Cabinet Parts List
Chassis Parts List
4
4
5
5
5
7
8
8
9
9
10
10
10
10
10
10
11
14
14
17
17
19
21
21
22
Fig.
1-1
1-2
1-3
3-1
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
4-1
4-2
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
5-10
5-11
5-12
5-13
LIST OF ILLUSTRATIONS
DESCRIPTION
Page
FrontView of Chassis 120098B 3
TubeLocationDiagram 4
Video, Audio, and OscillatorFrequencies 4
FrontPanelControls _. 5
Test Pattern,Correctly Adjusted 6
TestPattern, Tuning Misadjusted 6
Test Pattern,ExcessiveContrast 6
TestPattern,ExcessiveBrightness 6
TestPattern,VerticalHoldMisadjusted 6
TestPattern,Horizontal Hold Misadjusted 6
TestPattern,FocusMisadjusted 6
TestPattern,WeakSignal 6
Block Diagram—Chassis 12O110B,120113B 7
Schematic Diagram of Tuner 8
DeflectionYoke and FocusCoilAdjustments
CombinedMechanical and ElectricalCentering 11
FocusCoilAdjustments,MechanicalCentering 11
SchematicDiagramChassis120110B12,13
Rear DeflectionAdjustments 14
GeneratorMatchingNetwork 14
ScopeDetectorNetwork — 14
Location of AlignmentPoints 15
TunerAlignmentPoints 16
SideView of Tuner 17
Voltage and ResistanceDiagram 18
Sweep CircuitWaveforms 19
High Voltage PowerSupply,Chassis120113B 20
BottomView of Chassis 21

Emerson Radio
Section 1.
GENERAL DESCRIPTION
1. FACILITIES—Emerson Models 614,637,644,
and647are wide-bandvideoreceivers,providing di-
reci-view high-definition pictures ontenor twelve-inch
electro-magneticdeflectionkinescopes. All models in-
corporateseveraldesignfeaturesincludingintercarrier
sound, AFCinthe horizontalsync circuits,automatic
gain control, a series-typetransformerpowersupply,
and internalantennas.
Models 614and637 employChassis 120110B;
Models 644and647use Chassis 120113B. Bothchassis
are basically alike; the latter is modified to accommo-
date the largerkinescope,type 12LP4 or 12QP4.
Model 614is housed ina plasticcabinet, and Model
637is contained ina wooden cabinet; both are table
model receiversusing a type 10BP4 picturetube.
Model 644is housed ina tablemodel cabinet; Model
647 uses a consolette-type of cabinet.
2. SPECIFICATIONS—
a. TUBE COMPLEMENTS: (Table 1).
NOT!1": The tube complements of bothchassis
are alike,except forthe kinescope.Chassis 120113B
usestype 12LP4 kinescope; somechassis maybe
equipped with a type 12QP4.
SYMBOL
Vl
V2
V3
V4
V5
V6
V7
V8
V9
V10
Vll
V12
V13
V14
V15
V16
V17
V18
V19
V25
V27
V28
V29
TT TRP
1 . I M -
TYPE
6AG5
6AG5
6AU6
6AL5
6AU6
12AU7
6AU6
6AU6
6T8
6V6GT
6SN7GT
6AL5
6SN7GT
6SN7GT
12AU7
6K6GT
6BG6G
1B3GT
6W4GT
) 10BP4* or
112LP4#
6J6
6AG5
FUNCTION
First video i-f amplifier
Secondvideo i-f amplifier
Third video i-f amplifier
Video detector andAGC
First video amplifier
Secondvideo amplifier; second
sync amplifier
Sound i-f amplifier
Sound limiter
Sound disc, and audioamp.
Audio output
Hor.phase invert.; horizontal
control(d.c.amp.)
Hor.phasedet. (sync disc.)
Hor.oscillator and discharge
Vert, oscillator and discharge
Sync sep. and d.c.restorer;
first sync, amplifier
Vertical output
Horizontal output
High-voltage rectifier
Horizontaldamper
Kinescope
Oscillator and converter
R-f amplifier
5U4G Low- voltage rectifier
* Chassis 120110B # Chassis 120113B
WOBBLE PLATE
LEVER
LOW VOLTAGE
POWER SUPPLY
PICTURE CENTERING
LEVER (FOCUS COII
DEFLECTION YOKE
C-2l,C-39,C-4l,C-74
HIGH VOLTAGE
POWER SUPPLY
ON-OFF VOLUME
AND CONTRAST
AUDIO I-
SECTION
C-36.C-49
C-75
VERTICAL HOLD
BRIGHTNESS
AND HORIZONTAL HOLD
VIDEO I-F
SECTION
TURRET
TUNER
SELECTOR AND
FINE TUNING
Figude 1-1—Front View of Chassis 120110B

Emerson Radio
LOCATIONS
Figure 1-2 Tube Location Diagram
b. RECEIVER CHARACTERISES: (TableII).
ITEM
Voltage Rating
Power Consumption
Current Drain
(At 117 volts a.c.)
Frequency Range
.Intermediate
Frequencies
Input Impedance
Channel Selection
Chassis Models
Audio Output
DESCRIPTION
105-125 volts, 60 cycles a.c.
All models — 190 watts
All' models — 1.7 amps.
54-88 MC.; 174-216 MC.
Video — 25.75 MC.
Audio — 4.5MC.
300 ohms, balanced
Twelve position, rotary turret
Models 614, 637— Chassis
1201 10B
Models 644, 647— Chassis
120113B
2.5 watts
9S53ZO
OSCILLATOR FREQUENCY
CHANNEL LIMITS 54
CHANNEL
AUDIO CARRIER
VIDEO CARRIER
CH.2 CH.3 CH.4
81 67 93
7C 76 I
CHS CH.6
103 109
3. 1 ^ i ,
59.75
Jr. 71.
I Is!6
'5
I
81.75
87.7
1 i
5
LOW BAND
55.25 61 25 67.25
77.25 8325
OSCILLATOR FREQUENCY
CHANNEL LIMITS
CHANNEL
AUDIO CARRIER
VIDEO CARRIER
CY
174
I 7
179.
180
CH.7CH.8
201 207
CH.9
213
CH.IO CH.M CH.I2 CKI3
219 225 231 237
2O4 | 210 1 216 1
1 8 1 9 1 '°
75
185. 75
J.
197.7
II 12
5
1
203.75 20!
I »
.75 215
I
75
11
J
HIGH BAND
175.25 18125 187.25 193.25 199.25 205.25 211.25
Figure 1-3—Video, Audio, and Oscillator Frequencies
Section 2.
INSTALLATION
1. PREPARATION FOR INSTALLATION —
All models are shippedcomplete,with the kinescope
in place andall adjustmentsproperlyset.Present
models are equippedwithinternalantennas andme-
chanicaldeflectioncentering. Initial production mod-
elsdonot include the built-in antenna and make use
of combinedelectrical and mechanicalcentering.
2. ANTENNA INSTALLATION—Chassis 12011013
and 120113B are designed to operate withhighsensi-
tivity and willprovideexcellentreception in many
areaswith the internalantenna. If performance ina
particularlocality is unsatisfactorydisconnect the
internal antenna and install a portable oran outdoor
antenna, depending on receptionconditions.
a. PORTABLE ANTENNA: Sincesurrounding
buildings and otherobjects can block out televi-
4
sionsignals, an indoorantennashould be tried
in different locationsbeforedeciding ona perma-
nentposition.Uncoil the. transmissionline from
the antennabase and connect tothe terminals at
the rear of the chassis. Tune the antenna, after
turning onthe receiver and adjusting the con-
trols, by rotating and varying the length ofthe
telescopic arms for bestreception.Botharms
should be adjusted tothe sameangularposition
and extended tothe samelength.
PERMANENT ANTENNA: For outdoor , an-
tenna installations, usea dipole oran array with
a combination of elements. An EmersonTele-Ray
antenna is recommended, for bestresults. A 300-
ohm transmission line is required for connection
to the receiver.

Emerson Radio
3. RECEIVER INSTALLATION — Locate the re-
ceiver where a minimum of brightlight falls directly
onthe screen,althoughcompletedarkness isnot recom-
mended. Provideadequateventilation by keeping the
back ofthe receiveraway from the wall. Donotob-
struct the ventilatingslots atthe rear ofthe cabinet.
All models are providedwith a protectiveenclos-
urefortheendof.the kinescope. The enclosure is
fastened tothe rear ofthe chassis.Careshould beex-
ercised duringinstallation soasnotto strike orjar
the enclosure.
After completion of antenna and powerconnec-
tions, operate the receiver as outlined in SectionIII.
If a receiver fails to operate, orif operation is unsat-
isfactory, proceed with the following checks andad-
justments.
CAUTJON
Only experienced personnel shouldattempt to make
theseadjustments, as highvoltage often kilovolts
is present atthe kinescope.
a. MECHANICAL ADJUSTMENTS: Forall
models, remove the chassisback and check all
tubes to makecertainthey arefirmly seated in
their sockets.Remove the kinescopeenclosure
and check the seating ofthe base plug.Inspect
the high-voltageanodeconnector.
The deflection yoke and focus coil havebeen prop-
erly positioned atthe factory. The kinescopeshould
be seatedbackagainst the edges ofthe deflection
yoke assembly.Inspect the assembly to make
certain that all adjustmentwingnuts are tight.
Theion trap should be positionedapproximately
over thetwo internal flags near the base ofthe
kinescope.
b. ELECTRICAL ADJUSTMENTS: An adapter
line cord is required to operate the receiver for
the following preliminaryadjustments.
1) Turn the OFF-VOLUME control a quarter-
turnclockwise to turn onthe receiver. Setthe
BRIGHTNESS control a half-turn clockwise
and turn the CONTRAST control countei-
clockwise. Allow the tubes to warm up.
2) Setthe SELECTOR control toan activechan-
nel and adjust the TUNING control for best
picture quality. A test pattern is preferable
for theseadjustments.
3) Adjust theion trapmagnet by movingslowly
forward or backwardwhilerotating slightly
around the neck of -the kinescope to obtain
maximumpicturebrightness.Reduce the
BRIGHTNESS controlsettinguntil the pat-
tern is at7 approximatelynormalbrilliancy. Ad-
just the 'FOCUS control, atthe rear oi the
chassis, for maximum sharpness of rasterlines.
Then readjust theion trap for maximumbril-
liancy.
4) Adjustment ofthe deflectionyokeassembly is
required ifthe raster isnot horizontal.Loosen
the. center wingnut and rotate the assembly
slightly to correctthiscondition.
5) Centering ofthe raster inthe mask is con-
trolled by bothelectrical and mechanical ad-
justments, orby mechanicaladjustmentsalone.
If thisadjustment is required,refer to Section
Vfor operation ofthe chassiscontrols andpo-
sitioning ofthe focus coil.
6)All electricaladjustments atthe rear ofthe
chassishavebeen setatthe factory. Ifthe set-
tingshavebeendisturbed orifthe kinescope
requires replacement,theymust be carefully
readjusted in accordancewith the procedure
outlined in Section V.
Section 3.
OPERATION
1. OPERATING CONTROLS—The operation and
function ofthe front-panel controls is identical forall
models. Sevencontrols are provided, as shown infig-
ure 3-1.
2. TUNING—Tuning the receiver initially requires
operation ofthe variouscontrols as indicated.
a. STATION SELECTION:
1) Turn the OFF-VOLUME controlclockwise
approximately a quarter-turn. This turns the
receiver onand sets the soundvolume toa
reasonablelevel.
2)Set the'SELECTOR control so that the desired
channel number is indicated onthe edge ofthe
control. Thiscontrol maybe rotated in either
direction.
3) Allowapproximately IS seconds for warmup.
(This time is necessary to allow the tubes to
attain the propertemperature for operation.)
4)Ifthe desiredstation is-broadcasting, music or
speech will be heard.Adjust the TUNING
control for best picture quality.Readjust the
VOLUME or desiredsound level.
5) Rotate the CONTRAST control toits extreme
counter-clockwise position.
CONTRAST CONTROL:
ADJUSTS PICTURE CONTRAST,
LIGHT OR DARK.
•OFF-VOLUME CONTROL:
TURNS RECEIVER ONAND
ADJUSTS SOUND VOLUME.
BRIGHTNESS CONTROL:—
ADJUSTS PICTURE
AVERAGE BRIGHTNESS.
HORIZONTAL HOLD CONTROL
STOPS HORIZONTAL MOTION
OF PICTURE.
VERTICAL HOLD CONTROL.
STOPS VERTICALMOTION
OF PICTURE
INDICATOR CONTROL;
SELECTS STATIONS.
FINE TUNINGCONTROL
ADUSTS RECEIVER
FOR BEST PICTURE
Figure 3-1—front Panel Controls

Emerson Radio
Figure 3-2—Test Pattern
Correctly Adjusted
Figure 3-4—Test Pattern
Excessive Contrast
I ,r' .,'
V" '-f m_ .«. •
Figure 3-3—Test Pattern
Tuning Misadjusted
Figure 3-5—Test Pattern
Excessive Brightness
Figure 3-6—Test Pattern
Vertical Hold Misadjusted
Figure 3-7—Test Pattern
Horizontal Hold Misadjusted
Figure 3-8—Test Pattern
Focus Misadjusted
Figure 3-9—Test Pattern
Weak Signal

Emerson Radio
6) Rotate the BRIGHTNESS control tothe max-
imum counter-clockwiseposition and then ad-
just slowlyclockwiseuntillight is just visible
on the screen.Rotate in reversedirection un-
til lightjustvanishes.
7) Adjust the CONTRAST control until a pic-
ture appears onthe screen and desiredcon-
trast is attained. A further reduction inthe
BRIGHTNESS controlsetting may improve
the apparentcontrast ofthe picture.
8)Ifthe picturemoves vertically or horizontally,
make the adjustmentindicated in steps 9 and/
or10.
9).Adjust the VERTICAL HOLD controluntil
the picture stops moving upor down. Proper
operatingsetting of thiscontrol isinthe cen-
terofthe range over which the pictureremains
stationary.
10) Adjust the HORIZONTAL HOLD control
until picture stops moving from side to side.
11) Readjust the CONTRAST control until the
desiredpicture intensity is obtained. Itmay
be necessary o readjust the BRIGHTNESS
control slightly atthe sametime for optimum
brilliance.
12) After the receiver has beenoperating for some
time, itmaybe necessary to readjust the TUN-
ING control slightly for best picture quality.
1). CHANGING STATION DURING OPERA-
TION :
1) Setthe SELECTOR control tothe proper
channel number.
2) Readjust the TUNING control if necessary to
obtain best picturequality.
3) Readjust the CONTRAST controlslowly un-
til the desiredpicturequality is obtained.
4) Readjust VOLUME to suitable level.
5) Readjust BRIGHTNESS control for desired
brilliancy.
c. CHECKING OPERATION: Theuseof auto-
maticfrequencycontrol in the sync circuits of
the receiver makes readjustments ofthe VER-
TICAL HOLD and HORIZONTAL HOLD
controls infrequent provided the controlset-
tings for proper operation arenot disturbed.
Figures 3-2 through 3-9 indicatecorrect and
incorrectadjustment ofthe variouscontrols.
Proper operation maybe obtained by operation
of the associatedcontrol.
Section 4.
CIRCUITDESCRIPTION
1. GENERAI^-Chassis 120110B and 120113B are
basically alike; the latter is modified to accommodate
a 12-inchkinescope and containssomechanges inthe
high-voltagepowersupplycircuits.Bothchassiscon-
taintwenty-threetubesincluding the kinescope and
low-voltage rectifiers. The chassis usethe intercarrier
method of soundreception,with the4.5 me. audio i-f
produced by heterodyning the video and audio carriers
atthe output ofthe video detector. The various stages
of the receivers are indicated inthe blockdiagram, fig-
ure 4-1.
I05-I25V
60~A C.
v ;
R-F t
6AC
B
5
V-I5B
1ST SYNC
AMP
I2AU7
V-2 9
L.V. RECT.
5U4G
V-2
CONVE
6.
7A
6
V-2
6J
78
ATOR
B
T
1
1
1
1
1
_J
V-
AUDIO
7
I-F
AMP
64U6
I2575MC
'I2I.25MC.
V-l
1 ST VIO I-F
AMP
6AG5
V-6B
2ND SYNC.
AMP.
I2AU7
E
B1-
L_
B-
V-2
2ND VIO I-F
AMP
SAGS
V-3
3RD VID. I-F
AMP
SAUS
V-l
HOR
A
PH.
INV.
SSMTOT
V-14
VERT OSC.
6SN7GT
•—
V-
VID.
4
DET.
AND AGC
SALS
r
V-IZ
HOR.PH.
DET.
6AL5
I
V-IS
VERT. AMP
6K6GT
V-8
AUDIO I-F
LIMITER
6AU6
V-5
1 ST VIDEO
AMP
6AU6
V-9
DISC. AND
AUOIO AMP
•Ti
V-6A
2 NO VIDEO
AMP.
I2AU7
V-MB
HOR CONT
6SN7GT
V-13
HOR.OSC.
6SN7
V-17
HOR AMP.
68G60
V-IO
AUDIO
OUTPUT
SV60T
V-I5A
SYNC. SEP.
0 C RES.
12 AU7
_J
V -IB
H.V. RECT.
IB3GT
V-19
HOR. DAMP
6W4GT
-<
10 B
-tf
1
°4
V-25
OR IZLP*-
Kf
Figure 4-1—Block Diagram, Chassis 120110B, 120113B

Emerson Radio
2. TUNER — The r-f.unitconstitutes a separate
sub-chassis ofthe receiver. This sub-chassis con-
tains the r-f amplifier,converter, and oscillator
stages. The channelswitch, fine tuningcontrol,
tuned circuits, andfirst video i-f transformer are
alsocontained on thischassis.Tuning and track-
ing adjustments forall twelvechannelscurrently
in useare provided. The tunerserves to select
and amplify the desiredvideo and audio frequen-
cies and convertthem tothe carrier i-f frequencies
of 25.75 me. for video and 21.25 me. for audio.
No separation of these two intermediatefrequen-
cies is mads, andthe completesignal isfedtothe
first video i-f stage.
The tuneruses a rotaryturretcarryingindivid-
ual coils for each tunedcircuit, for eachchannel
setting. A type 6AG5 (V28)serves asther-f
amplifier anda type 6J6 (V27) asthe converter
and oscillator. Ther-f amplifier isa wideband,
tuned stagewhoseoutput is inductivelycoupled
to the converter (V27). The oscillator (V27B)
operates ina Colpittstypecircuit.Individual
slugsprovide for alignment ofthe oscillator onthe
various channels. A variable-dielectric type of
condenser is used forfine tuning ofthe oscillator.
The output ofthe converter is conected to double-
tuned firsti-f transformer (Tl).
The center-tappedprimary (LI) ofther-f coil
is designed to match a balanced 300-ohm line. The
secondary (L2) is tuned bythe inputcapacity of
V28in serieswith the parallelcombination of
trimmer A14anda 5 mmf. condenser. The output
of V28is coupled to V27A byL3, which is tuned
by trimmer A15 and 'the outputcapacity ofthe
tube. A 10K resistorloads L3 to provide the
requiredbandpass.
The inputcapacity of V27A and trimmer A16
tune the converter coil (L4). The oscillatorcoil
(L5) is wound onthe sameformwith L3and
L4,for inductivecoupling. The initialoscillator
frequency isfixedby permeabilitytuning ofL5
and the preset .5-3mmf.trimmer. The frequency
is varied by means ofthe TUNING control(3-5
mmf. trimmer)whichconsists ofa spiral-shaped
dielectric discrotatingbetween fixed stator plates.
950098
270
ALL RES. IN OHMS,
CAP. IN MMF, UNLESS
OTHERWISE SPECIFIED
6.3AC
Figure 4-2 Schematic Diagram of Tuner
1. VIDEO SECTION—The video sectionconsists
of the following sections: video i-f; video detector and
automatic gain control; video amplifier and d.c. re-
storer.
a. VIDEO I-F:Both the 25.75 me. videocarrier
and 21.25 me. audio carrier are amplified by three
wide-band i-f stages. The four tuned cicruits are
peaked at .different frequencies,forming a stagger-
tuned system of relatively flat overallresponse to
produce the requiredbandpass.
Self-resonant, slug-tuned coils are used inthe
i-f transformers. Two stagger-tuned i-f trans-
formers (T2, T3) follow the overcouplscl firsti-f
(Tl). T2 is providedwith a 21.25 me. trap to

Emerson Radio
attenuate the audioi-f. An overcoupled i-f (T4)
completes the amplifier stages and feeds the video
detector(V4).
The audio level is maintained just below the
point of intertcrence with the videoi-t.However,
the audio i-t is not completelyrejected, asthe audio
signal is recovered (ac the output otthe video de-
tector) by heterodyningwith the videoi-f. The
4.5 me. beat between me video and audio inter-
mediate frequencies is obtained from the shunt-
tunedcircuitconsisting ofL2andC79andisfed
tothefirst audio i-f amplifier(V7).
b. VIDEO DETECTOR AND A.G.C. :The video
detector(V4A) rectifies the negativeportion of
the videoi-f. The resultantsignal is coupled
throughpeakingcoil LI tothe grid ofthefirst
videoamplifier(V5). V5B acts asthe automatic
gain control and develops a delayed negative A.G.C.
voltagewhich is used to bias thefirsttwo video
i-f stages andther-f amplifier.
c. VIDEO AMPLIFIER: The video amplifier con-
sists oftwo stages (V5and V6A). The second
stage is series-peaked andis coupled tothe grid
of the kinescope(V25) andthe sync separator
and d.c. restorer (VISA). The outputsignal of
V5 is varied bythe CONTRAST control(R19)
which varies the bias ofVS,to control the signal
input to V6A.
d. D.C. RESTORER AND SYNC CLIPPER:
The output ofthe videodetectorcontainsbotha.c.
and d.c.components ofthe videosignal, as well
asthe blanking and syncpulses.Since the video
amplifiers will not pass the d.c.component ofthe
videosignal, the backgroundlevel ofthe picture
will vary. The d.c.restorer (VISA) develops a
bias voltageacross R24 whichvarieswith the
averagevideosignallevel. This biasvoltage is
fed tothe grid ofthe kinescope,thusmaintaining
the properbrightnesslevel. The videosyncpulse
output of VISA, developed across R28, is coupled
through C22 tothefirst sync amplifier (V15B).
4. DEFLECTION SECTION—The sync and sweep
stagesproduce and control the deflection ofthe elec-
tronbeam inthe kinescope. The horizontalsweepcir-
cuitsincorporate a horizontal phasedetector(sync
discriminator) to maintainautomaticsyncwith the
horizontal pulses ofthe videosignal.
a. SYNC AMPLIFIER AND INVERTER: The
sync pulseoutput of VISA is amplified bytwo
triode stages (VISE and V6B) andfedtothe
horizontal phaseinverter (V11A). The integrat-
ing network ofthe vertical deflection circuit is
coupled tothe output of VI1 A, which provides
push-pull' output for I'le horizontal syncdiscrimi-
nator (VI2).
b. HORIZONTAL SWEEP: The horizontal de-
flection circuits contain an automaticfrequency
stabilizing arrangement which improvesstability
and ease of operation. The phaseinverter (V11A)
feeds the horizontalsyncpulses tothe horizontal
phasedetector (V12). Atthe sametime, V12
receives voltages fed back from the horizontal out
put (V17)through CSS. Any phase shift between
the horizontalsyncpulses andthe horizontal os-
cillator signal will cause the inputvoltageapplied
toone diodesection ofV12to differ from that of
the other and result ina d.c.biasvoltage onthe
grid ofthe horizontalcontroltune (Vll-b). This
bias voltage will be proportional tothe phasedis-
placementbetween the incomingsyncpulses and
the horizontaloscillatorvoltage andofa polarity
determined bythe lead orlagofthe oscillatorfre-
quency. The plateresistance of VHP) is part of
the biasnetwork ofthe gridcircuit ofthe horizon-
tal oscillator (Vlo). The output ofthe phase de-
tector(V12) will ihus synchronize the oscillator
tothe horizontalpulses ofthe videosignal.
The horizontalblockingoscillator(V13)operates
ata frequencydetermined by C57,R75,R76, and
the plateresistance of VIIB. The horizontal sync
pulsescause V13to lock inatthe sync frequency
when the HORIZONTAL HOLD control \R75)
is properly adjusted. The sweep voltage output
of V13is developed across R79andistedtothe
horizontaloutputtube (VI7). The signallevel
tothe horizontaloutputtube is adjusted bythe
HORIZONTAL DRIVE control,R80.
V19 supplies the requireddrivingpower forthe
horizontal deflection coils(L9). 'ihe output of
V17is coupled to the horizontal deflection coils
throughoutputtransformer T9.A portion ofthe
output transformersecondary is shunted bythe
HORIZONTAL SIZE control L6.By varying
the inductance ofL6,the horizontalsweepcurrent
maybe controlled.
The horizontaldampertube (V19) acts to damp
out oscillationswhichoccuroverpart ofthe hori-
zontalscanningcycle. The HORIZONTAL LIN-
EARITY control(L7)helpsprovide a linear
trace. V19isa type 6W4to eliminate the need
for a separatedamper filament winding,
c. VERTICAL SWEEP: Verticaloscillator V14 is
free-running and operates ata frequencydeterm-
ined by C71,R95, andthe VERTICAL HOLD
control (R94), inthe absence ofa verticalsync
pulse. The integratedsixty-cyclesyncpulse de-
rived from the videosignalreaches the grid of
V14 just before it wouldnormallytrip. This sync
pulse is great enough to drive the tube to conduc-
tion and cause itto lock-in atthe sync frequency.
The syncpulsethusmaintains control ofthe verti-
cal oscillatorsweepfrequencywhen R94is cor-
rectlyadjusted.
The output ofV14isfed to the vertical output
stage (V16) throughC72. The output ofV14is
controlled bythe VERTICAL SIZE control
(R96). R100varies the operatingpoint ofV16
by varying the bias,acting asthe VERTICAL
LINEARITY control The sweep voltage ofV16
is coupled tothe vertical deflection coils(L8) by
means ofthe verticaloutputtransformer (Til).
5. POWER SUPPLIES — Two powersupplies are
used to supply the requiredvoltages. Thelow voltage
supply uses a transformer and full-wave rectifier. The
high voltagesupply forthe kinescope isofthefly-back
lype andis energized bythe horizontaloutputtube.
a. HIGH VOLTAGE SUPPLY: The highvoltage
powersupplymakes useofthe energysupplied to
the horizontaloutputtransformer by VI7. When
the platecurrent of VI7 iscutoffatthe instant

Emerson Radio
of retrace of horizontalscanning, thefield built
up inthe primarycollapses and induces a high-
voltage. Thisvoltage is applied tothe high-voltage
rectifier (V18). From 8.5to10 kilovolts is pro-
duced bythe powersupply. The rectified voltage
is filteredbyC63and R89, and applied tothe
secondanode ofthe kinescope.Chassis 120113B
differs from Chassis 1201 IB in that C63is return-
edto B—, instead ofthe plate of VI9.
b. LOW VOLTAGE SUPPLY: The low-voltage
supplyuses a full-wave rectifier (V29) and trans-
former (T12). A seriesarrangement is used to
supply platevoltage, to reduce currentrequire-
ments. Asa result, separate filament windings
are used to keep the heater-cathodepotentials
within ratings, andthe electrolytic filter conden-
sers arenot grounded tothe chassis. The center-
tapof T12 isnot grounded butis negative (B—)
with respect to ground. The cathodes ofthe sweep
circuit and video amplifier tubes are negative to
ground(about-205volts) andthe heaters are
conected tothe ungrounded filament winding (Y).
6. INTERCARRIER SOUND—The audiocircuits
are conventional. The4.5 me. heterodynebetween the
video and audio, i-f carriers is taken from the shunt-
tuned circuit (L2, C79) atthe output ofthe video de-
tector (V4). The4.5 me. signal is amplified bythe
audio i-f amplifier (V7),whoseoutput is coupled to
the limiter(V8). V8 feeds the discriminator(V9A) ;
the output ofthe discriminator is amplified by V93,
andthe audiooutput(V10).
7y DEFLECTION YOKE AND FOCUS COIL
ASSEMBLY: The deflection yoke and focus coil
form a completeassembly. The yokecontains the
vertical and horizontal deflection coils (L8and
L9). The focus coil(L10)combines a permanent
magnet with the electromagnet (PMand EM).
The yoke and focus coil are independently ad-
justable.
Verticalcentering is accomplished by mechani-
cal adjustment of the focus coil; horizontalcenter-
ing is doneelectrically bythe HOR. CENTER-
ING control (R103). Laterproduction of Chas-
sis 120110B and 120113B makes useofa pivoted
mounting forthe EM-PM focus coil,together
with a "wobble plate" to provide for mechanical
adjustment of horizontal and verticalcentering.
The "wobble plate" consists ofa ring of perme-
able material (steel) surrounding the neck ofthe
kinescope,adjacent tothe EM-PM focus coil.
The plate maybe moved ina plane at right-angles
tothe axis ofthe kinescope,bothvertically and
horizontally, by means ofa slotted section and
lever. In addition, the focuscoil maybe tilted in
both directions by means ofa secondleverwhich
is adjustable from the rear ofthe cabinet,without
removing the back. This enablesprecisemechani-
cal control of centering.
Section 5.
MAINTENANCE AND ALIGNMENT
1. GENERAL—All adjustmentsmust be madeonly
by qualified service technicians. Unsatisfactory oper-
ationshould be analyzed and circuitscheckedsyste-
matically to locate and correctsources of trouble.
WARNING
Highvoltages in excess of 8000 volts are present
in the chassis,duringoperation. Exercise care in
servicing the receiver,whenenergized. Donot
remove,handle, or replace the kinescopeunless
gloves and goggles are worn.
2. CHASSIS REMOVAL—To remove the chassis,
follow the outlinedprocedure.
a.Pryoffall controlknobs.
b. Remove thesix screwswhich fasten the back in
place.
c. Remove the speakerplug.
d. Remove the four chassisbolts and carefullyslide
the chassis from the cabinet.Wheninverting the
chassis,place a supportingblockunder the power
transformer.
3. KINESCOPE REPLACEMENT —
CAUTION
Before removing the kinescope,discharge the tube
by cdnnecting an insulated test prod tothe chassis
and tothe high-voltageanode. Wear gloves and
gogglesbeforehandling the tube.
To remove the tube,proceed as follows:
a. Disconnect the high-voltagelead atthetopofthe
kinescope and discharge the tube.
b. Remove the enclosurewhichprotects the base of
the kinescope.
c. Remove the tubesocket and slide offtheion trap.
d. Loosen the hold-down strap atthe front ofthe
tube and carefully withdraw the kinescopefor-
ward from the deflection yoke and focus coil as-
sembly.
To install a new kinescope, follow the abovepro-
cedure in reverse.Makecertain that the tube is
seated against the edges ofthe deflectionyoke
assembly,with the high-voltageanodeconnection
atthe top. In replacing theion trap, position the
unit so that the arrow points towards the front of
the chassis.
NOTE
Whenever the kinescope is removed or replaced,
the maskshould be carefully cleanedwith a soft,
lintlesscloth. Donotuse carbontetrachloride or
any cleansercontainingabrasivematerial. The
face ofthe kinescopeshouldalso be wipedclean,
before replacing the chassis inthe cabinet.
4. MECHANICAL DEFLECTION ADJUST-
MENTS — See figure5-1.Replacement of the kine-
scope orofanyof the components ofthe deflection
systemwillrequirereadjustment of the deflectionyoke
assembly, focus coil, andion trap.
NOTE
Before making any deflection adjustments,make
certainthat the enclosure isin place,covering
the base ofthe kinescope, andisfirmly fastened.
The adjustments tothe focus coil canbe made
throughopeningsprovided inthe enclosure.
10

Emerson Radio
-,
C3
Figure 5-1—Deflection Yoke and focus Coil Adjustments,
Combined Mechanical and Electrical Centering
a. DEFLECTION YOKE: Ifthe rasterlines are
not horizontal,loosen the centerwingnut (Al)
and rotate the yoke coilassembly to correct the
condition. Tighten the wingnut firmly.
The position ofthe assemblyalong the axis ofthe
kinescope isfixedbythetwo outerwingnuts (Bl,
B2). The yokeshould be positionedapproxi-
mately atthe center ofthe slots.
ANODE CONNECTION
DEFLECTION
YOKE
ADJUSTMENT
FOCUS CONTROL-
LEVER
Figure 5-2—Focus Coil Adjustments, Mechanical Centering
b. EM-PM FOCUS COIL: For models not provid-
ed with a "wobbleplate,"adjust the upper screw
(Cl) of the focus coil to center the rasterver-
tically. Slightvariation ofthetwo sidescrews
(C2, C3)maybe required to complete the adjust-
ment. The focuscoilshould notbe positioned
c.
too close to the.deflectionyoke asthe range of
adjustment ofthe FOCUS control(R55) will
be limited.
To center the raster for modelsprovidedwith
a"wobbleplate"and focus levers,proceedasfol-
lows (See figure 5-2):
- 1 ) Adjust the focus lever to make the focus coil
concentric with the neck ofthe kinescope.
Loosen the threemountingnuts (Bl, B2,B3)
slightly, if required.
2) Loosen the singlewobble-platemountingscrew
(A)and slide the platevertically or horizontal-
ly, by means ofthe lever, to approximatelycen-
terthe raster. Tighten the mountingscrew.
3) Readjust focus coillever, if required, toex-
actly center the raster inthe mask.Bothhori-
zontal and verticaladjustments are ma'de si-
multaneously. Tighten the mountingnuts(Bl,
B2, B3) after positioning.
4) Notethatnormallyonly the vernieradjust-
ment (focus coillever) is required,unless the
kinescope has been replaced. The wobble-
platelever has been initiallypositioned atthe
factory and usually will not requirereadjust-
ment.
ION TRAP : Adjust the position oftheion trap
as outlined in Section II.
5. ELECTRICAL DEFLECTION ADJUSTMENTS
— The electricaladjustmentcontrols are located at
the rear ofthe chassis. For access tothe adjustment
controls,remove the cabinetback. Usean adapter
line-cord to complete the a-c. powerconnections,with
the back removed.
Before proceedingwithadjustment ofthe rear
controls,tune ina test pattern andsetthe front panel
controls forthe bestpicture, as outlined in SectionIII.
Complete the adjustments ofthe deflectionyoke and
focus coil before setting the electricalcontrols.Adjust
the controls inthe orderindicated.
a. ADJUSTMENT
(Table III).
CONTROL SETTINGS:
STEP
1
2
3
4
5
6
7
CONTROL
Vertical
Size
Vertical
Linearity
Horizontal
Drive
Horizontal
Linearity
Horizontal
Size
Horizontal*
Centering
Focus
SYMBOL
R-96
R-100
R-80
L-7
L-6
R-103
R-55
ADJUSTMENT
Affectsbottom section of
raster and overall size. Ad-
just to fill the mask verti-
cally (height).
Affects top section of ras-
ter and overall size. Adjust
for best linearity.
Controls signal to horizon-
tal output V-19. Adjust for
best linearity.
Affects linearity of left and
center sections of raster. Ad-
just in conjunction with
R-80, for best linearity.
Adjust to fill the mask
horizontally (width).
Adjust to center raster hor-
izontally.
Controls current through fo-
cus coil L-10. Adjust for
sharpest line detail.

Emerson Radio
Figure 5-3—Schematic Diagr,

Emerson Radio
PART No. 950127
Diagram, Chassis 120110B
13

Emerson Radio
Proper adjustment ofthe HORIZONTAL and
VERTICAL LINEARITY controls, andthe SIZE
controls shouldresult in testpatterns in which the
circles are round andthe wedges are linear and equal.
The testpatterncircles should be concentricwith the
curvedsides ofthe mask.
120
Figure 5-4—Rear Deflection Adjustments,
*For chassis not equipped with wobble plate and
centering lever.
6. ALIGNMENT TEST EQUIPMENT — Proper
servicing and alignment of Chassis 120110B and 120-
113B requires the equipmentindicated.
a. SWEEP GENERATOR:
1) Frequencyranges of18to30 MC., 50to90
MC., and170to225MC.
2) Sweepwidthvariable to10MC.
3) Output ofat least 0.1 volt, with an attenuator
for adjustment of output.
4) Constantoutputoversweepwidth,with flat
output onall ranges andatall attenuatorposi-
tions.
5) Outputimpedance of300 ohms, forr-f align-
ment, or matchingnetwork. See figure 5-5.
b. MARKER GENERATOR:
1) Frequency ranges of4 to30MC.and50to
225 MC., for i-f and r-f alignment. The mark-
er generator mustprovide an accurate(crystal
calibrated) frequency of4.5MC.for audio i-f
alignment, and accuratefrequencies from 21.25
MC., to 25.75 MC., for video i-f alignment.
The required r-f requencies from 50to225
MC., as tabulated below, maybe provided by
a calibratedsignalgenerator ora heterodyne
frequency meterwithcrystalcalibrator.
2) Output ofat least 0.1 volt,with an attenuator
for adjustment of output.
GENERATOR FREQUENCIES:(Table IV).
CHANNEL
2
3
4
5
6
7
8
9
10
11
12
13
VIDEO
CARRIER
MC
55.25
61.25
67.25
77.25
83.25
175.25
181.25
187.25
193.25
199.25
205.25
213.25
AUDIO
CARRIER
MC.
59.75
65.75
71.75
81.75
87.75
179.75
185.75
191.75
197.75
203.75
209.75
215.75
TO
GEN.
50
/ OR HOR
OPENING
EXTEND
HV
CAN
®
[§T| L-6L-7
J ® ®
\ HOR. HOR.
SIZE LIN.
ZONTALLY IN FRONT --'' i*T"~""-
, ADJUST THE LEVER |^H>. S
NG FROM BACK COVER. |H^'-'JT"''*1
11 !
PICTURE 1 I </fS\^ Wtr- ' '!
LEVER J& . J<^
fixx t
x'_>^ NECK OF TUBE
?
f 1
f*\) \.fU\ — :i^: . — — : — :
/
II II
INTERLOCK
(oo)@ SPEAKER
R-80 R-IOO R-9«R-38 R-103 *
o o o o Ao
HOR. VERT. VtRT. FOCUSZ_L_iMOR .*
DRIVE LIN. SIZE / CENT.
CODE NUMBER—/
955282
TO
RECEIVER
-AAA/ -
120
USE CARBON RESSTORS ONLY.
Figure 5-5—Generator Matching Network
VACUUM-TUBE VOLTMETER:
1)A diodeprobe for high-frequency measure-
ments is desirable.
2) Highinputimpedancewithprovision for low-
voltage measurement(three orfive voltscale).
OSCILLOSCOPE:
1) Verticalinputshould be providedwith a cali-
brated attenuator and low-capacityprobe.
2) Flatvertical amplifier frequency response, with
good low frequencyresponse.
3) Adequateverticalsensitivity.
SCOPE DETECTOR: Required for alignment of
over-coupled firsti-f Tl. See figure 5-6.
20K IN34.005 MFD
100-
MMF **
j IXU | /|
>IMEG. ^Z00y\
: i
L
r
TO TESTPOINTS
IN RECEIVER
(KEEP LEADS SHORT)
Figure 5-6—Scope Detector Network
7. ALIGNMENT—
a. AUDIO I-F ALIGNMENT:
1) Disconnect the antenna and remove the chas-
sis from the cabinet. Usean adaptorlinecord
to operate the receiver.
2)Setthe CONTRAST control atthe center of
rotation and retain at thissetting foralli-f
adjustments.
3)The waveformsshown inthe responsecurves
maybe inverteddepending onthe number of
amplifying stages inthe vertical amplifier of
the scopebeingused.
4) When the markersignal is coupled in parallel
with the sweepgenerator, the signalshould be
Unmodulated and attenuated so that only a
small pipis visible. Usean accurate,crystal-
controlledmarkergenerator.
5) Connect the syncsweepvoltage from the sweep
signalgenerator tothe horizontalinput ofthe
scope for horizonal deflection.
6) Refer tofigure5-7for location of alignment
points; figure5-3forthe schematicdiagram.
7) Setthe receiver to Channel 3.
14

Emerson Radio
figure 5-7—Location of Alignment Points
AUDIO I-F ALIGNMENT:(Table V).
STEP
1
2
3
4
SIGNAL GENERATOR INPUT
CONNECTION
Marker generator
through .OO1
mfd. topin2 of
V4.Low aide
to B — .
n
Connect sweep
generator in
parallel with
marker gen.
>>
FREQUENCY
Marker— 4.5
MC.
Marker — 4.5
MC.
Sweep — 4.5
MC. (450 KC.
sweep) Marker
— 4.5 MC.
n
MEASURING
INSTRUMENT
Connect v.t.v.m.
Connect v.t.v.m.
to junction of
R38 and C27.
Low side to B — .
»
Replace v.t.v.m.
with scope con-
nected through
10K resistor to
junction ofR44
and C31.
H
ADJUST
C79
T5
(Top and
bottom)
T6
(Bottom)
T6
(Top)
PROCEDURE
Peak for maximum re-
sponse. Adjust generator
input to produce one volt
reading on v.t.v.m.
Peak for maximum
response
Position 4.S MC. marker
at center of S-curve, by
adjusting secondary
bottom.
Peakprimary for maxi-
mum amplitude and
linearity. Repeat step 3.
RESPONSE
CURVES
*ISOKC. ,~^
«*MC. /
^-/ -ISOKC.
b. VIDEO I-F ALIGNMENT:
1) Retain the controlsettingsused for audio i-f
alignment.
2) Connect a 3 voltbiasbattery from the junction
of Rl, R6,and Rll (negative terminal), to
chassis(positiveterminal) for step 5.
3) Shape the overallresponsecurve, after indi-
vidual peaking of stagger-tuned and over-
coupled i-f transformers.Maintainoutput of
the sweep and markergenerators ata mini-
mum, to prevent distortion ofthe response
curve.
15

Emerson Radio
VIDEO I-F ALIGNMENT:(Table VI).
STEP
1
2
3
4
5
SIGNAI GENER
CONNECTION
Lightly couple
marker gen. to
pin 1 of V3:
Sweep gen.from
pin 1 to chassis,
:hrough .001mfd.
Connectmarker
and sweep gener-
ators topin1
of V2, through
.001mfd. Low
side to chassis.
Sweep generator
coupled to con-
verter (V27) in-
put, usingthree
turnloopslipped
over tube. Marker
gen. in parallel.
Low side to
chassis.
TJ
»
Connect AGC
ATOR INPUT
FREQUENCY
Sweep- 23.5 MC
(10 MC. sweep)
Marker-25.75
MC.
Sweep -23. SMC.
(10 MC. sweep)
Marker-25.25
MC.
Sweep- 23.5 MC.
( 10 MC. sweep)
Marker-25.75
MC.
Sweep -23. SMC.
(10 MC. sweep)
Markers-
22.8 and
21.25 MC.
Sweep - 23.5 MC
bias battery as ( 10 MC. sweep)
indicated above. ! Markers-
25.75 MC.
and 22.25
MC.
MEASURING
INSTRUMENT
Connectvertical
input of scope
through 10K re-
sistor to junction
of Ll, R16,
and C16. Low
side to chassis.
»
Connectscope
through detector
network topin1
of V2.Low side
to chassis.
Connectscope
through detector
network topin1
of V3.Low side
to chassis.
Connectscope
through 10K re-
sistor to junction
of Ll,R16and
C16. Low side to
ciiassis.
ADJUST
T4
(Top and
bottom)
T3
Tl
(L7 and
L9)
T2
(Top and
bottom)
T2,
T3
PROCEDURE
Set marker as shown on
responsecurve;marker
should be10% down. Ad-
just sweepgenerator in-
put to produce one volt
at junction ofLl, R16,
and C16.
Set 25.25 MC. marker as
shown on responsecurve.
Set marker as shown on
responsecurve.
Adjust primary ofT2
(top) to position22.8
MC. marker;adjust T2
trap(bottom) to position
21.25 MC. marker.
Adjust T2 (top) andT3
to giveoverallresponse
shown. T2 (tor>) adiusts
bandwidth; T3 positions
videocarrier(25.75MC.)
depending on accuracy of
adjustment ofTl (25.75
MC. marker).
RESPONSE
CURVES
25.75MC. MARKER
^t"^" *~\ \ \ \ BAND WIDTH \ 4.7 MC \ 25.2SMC.
/ XI
/ \ \ \N
J25.7SMC. \I MARKER \ \ \ BAND WIDTH \ 4 SMC \
/JlZZ.BO MC.
/l\R
y \ Vm
/ T^K
s~* — •"•>
/ \y \ 2 2.2 SMC.
MARKER/! IMARKER
/ BANDWIDTH \ 3.5 MC \O I-F ALIGNMENT: (Table VI).
c. TUNER ALIGNMENT:
1) Set fine tuningcontrol to center of rotation.
Retain tbis setting or entire r-f alignment.
2) Retaincontrolsettingspreviously used.
3) Couplemarkergenerator in parallel with sweep
generator.
4)Use10 inc. sweep lor sweep generator. Couple
generator to antennaterminals of receiver. If
the sweep hasa 50 ohm, unbalancedoutput,
connect tothe antennaterminalsthrough net-
workshown infigure 5-5.
5) Connectverticalinput of scope in scries with
10K resistor to junction ofLl, R16, and C16.
6) Refer tofigure5-8for tuneralignmentpoints,
andfigure 4-12 forthe tunerschematic.
7) A14,A15, A16are r-f amplifier and converter
trimmers andare adjusted on Channel 12;
A13-A2 are oscillatorslugs forthe correspond-
ing channels.
FIRST I-F TRANSFORMER T-l
t-9 1 R^ AMPLIFIER
(SEC.) *7 SAGS .
R-F AMP. INPUT
TRIMMER A-14
figure ?-8—Tuner Alignment Points
16

Emerson Radio
TUNER ALIGNMENT: (TableVII).
STEP
1
2
3
4
5
6
7
8
9
10
11
12
13
SIGNAL GENERATOR INPUT
SWEEP GEN.
207.0 MC.
»
213.0 MC.
201.0 MC.
195.0 MC
189.0 MC.
183.0 MC.
177.0 MC.
85.0 MC.
79.0 MC.
69.0 MC.
63.0 MC.
57.0 MC.
MAR.GEN.
209.75 MC.
ft
215.75 MC.
203.75 MC.
197.75 MC.
191.75 MC.
185.75 MC.
179.75 MC.
87.75 MC.
81.75 MC.
71.75 MC.
65.75 MC.
59.75 MC.
CHANNEL
12
12
13
11
10
9
8
7
6
5
4
3
2
ADJUST
A12
A14,
A15,
A16
A13
All
A10
A9
A8
A7
A6
A5
A4
A3
A2
PROCEDURE
Adjust for placement of 21.25 MC. marker
as per overall response curve.
Adjust shape of overall response curve for
maximum amplitude and bandwidth.
Adjust asin Step I.
»
»>
»
»
»
j>
>»
»>
»
»
NOTE: Ther-f responsecurve ofthe tuner, on each channel maybe observed by connecting the scope in serieswith a 10K
resistor tothe test pointshown in figure5-9. The curves should havemaximumamplitude and flatness,consistentwith
properplacement of the 21.25 me. marker on the i-f responsecurve.
8. VOLTAGE AND RESISTANCE ANALYSIS—
Voltage and resistancereadings are indicated infigure
5-10, toaidin servicing the chassis. The diagramindi-
catestypicalvalues obtained under the following con-
ditions.
a. ANALYSIS CONDITIONS:
1) Linevoltagemaintained at117 volts for volt-
age readings.
2) Measurementsmadewith voltohmyst or equiv-
alent.
3)All voltagemeasurements arein+ d.c.volts
and resistance in ohms,unlessotherwisenoted.
4) Socket connections are shown as boUom v'<"vs.
Measuredvalues are fromsocket pinto B—,
unless otherwisestated.
5) Readingsmade with antennadisconnected, no
signal applied and controls at normal.
6) Readingsmarked * are measured to ground.
9. DEFLECTION CIRCUIT WAVEFORMS —
Seefigure 5-11. The sweepvoltagesproduced inthe
horizontal and verticalsweepcircuits maybe used in
locating defects inthe deflectionsection ofthe chassis.
Two separatewaveforms are shown at varioustest
points uptothe output ofthe secondsync amplifier
(V6B), as bothhorizontal and verticalpulses ar? pres-
ent. Different sweep frequencies are required atthe
scope to distinguish between the syncpulses.
a. ANALYSIS CONDITIONS:
1) Linevoltagemaintained at117 volts.
2) Controls at normal ; no signal input.
3) Peak-to-peakvaluesindicated may vary due
to componenttolerances and response of scope.
Readings are obtained by calibration of scope,
prior to observation of waveforms.
OSC. AND CONV
TEST POINT
TRIMMER »-!«
R-F OUTPUT, CONV.,
AND OSC. COILS
(L-S,L-4,L-5>
Figure 5-9—Side View Tuner
10. PRODUCTION CHANGES—Several changes
have beenincorporated inthe chassisused in Models
614,637, and 644,duringproduction. These changes
maybe identified by codemarkingsconsisting ofa tri-
angle containing a particularnumber,stamped atthe
rear ofthe chassis.Presence ofa particularmarking
indicates that the revisionsdescribed have beenmade
in the chassis. The various revisions are summarized
below. Unlessotherwisenoted, the changeshavebeen
added toall subsequentmodels.
17

Emerson Radio
ALL VOLTAGE AND RESISTANCE
MEASUREMENTS MADE TO B- (R-61)
Figure 5-10—Voltage and Resistance Diagram
DEFLECTION WAVEFORMS: (Table VIII).
TUBfi
Sync Separator
V-15A
First Synci Amp.
V-15B
SecondSync.Amp.
V-6B
Hor.Phase Inv.
V-11A
Phase Det.
V-12
Hor. Control
V-11B
Hor. Osc.
V-13
Vert. Osc.
V-14
Vert.Output
V-16
TEST
POINT
Pin 3
Pin 1
Pin 6
Pin 6
Pin2
Pin 5
Pin7
Pin 5
Pin 5
Pin 1
Pin4
Pin 2
Pins 3,4
HORIZONTAL
KEY
LETTER
AH
BH
CH
DH
EH
GH
HH
IH
JH
KH
PEAK to PEAK
VOLTAGE
22.3
8.9
11.4
77.4
19.0
8.7
6.0
14.5
55.4
53.5
VERTICAL
KEY
LETTER
AV
BV
CV
DV
EV
GV
HV
LV
MV
NV
PEAK to PEAK
VOLTAGE
36.6
11.3
18.5
117
40.2
9.7
9.2
178
100
303
18

Emerson Radio
Figure 5-11—Deflection Circuit Waveforms
a. CODE MARKING — E: Part No. 925162, C21,
C36, and C49; C49(80 mfd.) is marked A, and
C21 (10 mfd.) is marked Q dueto incorrectcon-
densermarking,instead of markingsshown on
schematic diagram.
b. CODE MARKING — C:No Pyramidpaper
tubularcondensersused.
c. CODE MARKING-TRIANGLE 1: Revisions
to correctpicture flicker.
1) Removed red leadfrom B+ 125-volt point on
terminalstripnearfourth i-fand from pin6
of V-5 (6AC6). Removed red leadfrom the
40 mfd. (O) terminal of C-42 and from pin
6ofV-S (6AU6).
2) Inserted a jumperfrom theB+ 125-volt point
on the terminalstripnear fourth i-ftothe
40 mfd. ( D ) terminal of C-42.
3) Removed oneendof R-28(47K)from pin
6ofV-5 (6AU6) ; rewired to B+ 125-volt
point on terminal strip near fourth i-f.
4) RemovedR-27 (33K) from B+ 125-voltpoint
on terminalstrip near V-12 and V-13, and
from the junction ofthe blueleadwith the
10 mfd. (A) terminal of C-21, onthe terminal
strip near V-6and V-lS. RewiredR-27 be-
tween pin6 ofV-5 (6AU6) andthe empty
lug on the terminal strip adjacent to the power
transformer; added a wirefromthispoint to
the junction of R-52, 470,000 ohms, andthe
green lead from the fuse holder.
5) Openedjunction of blueleadfromC-21with
R-26 (3900 ohms) onthe terminalstripnear
V-6and V-15.
6) RewiredR-26 to chassis; rewiredbluelead
from C-21 topin6 of V-5.
d. CODE MARKING — TRIANGLE 1J: Includes
revisionscovered by codemarkingTriangle 1, plus
changes to correctpictureweave as detailed in
codemarkingTriangle 4.
e. CODE; MARKING — TRIANGLE 2: Includes
revisions covered by codemarkingTriangle 2, plus
changes in vertical deflection circuitdetailed un-
der codemarkingTriangle 4.
f. CODE MARKING — TRIANGLE 3: Same as
for codemarkingTriangle 2,but includesboth
horizontal and verticalcircuit revisions outlined
in codemarkingTriangle 4.
g. CODE MARKING — TRIANGLE 4: Includes
revisionscovered by codemarkingTriangle 1, plus
additional changes to eliminatepictureweave, as
follows:

Emerson Radio
1) Added a single lug terminalstripbetween soc-
kets V-l and V-ll.
2) Transferredjunction of R-66 (4.7K), R-67
(2.2K), and C-53 (.001 mfd. mica) from dum-
mylug underverticaloutputtransformer to
new dummy lug terminal.
3) Transferredwiring from lug8 of VI1 socket
to the empty lugon terminalstripunder verti-
cal outputtransformer.
4) Removedjumperwireconnectinglugs 3 and
4of V-6 socket.
5) Transferredjumperwirelocatedbetween cen-
ter shield pinandlug4 ofV-6 socket tolug
3of V-6 socket.
6) Transferredyellowleadfrom lug 5 tolug3
of V-6 socket.
7) Removedyellowleadbetween lug3 of V-l3
socket andlug2 of V-l7 socket.
8) Transferred R-51 (270K) from lug2 of V-17
Socket tolug3 of V-13 socket.
9)Cut jumperbetweencentershield pinandlug
4of V-12 socket.
10) Transferred all wiring from lug4 of V-12 soc-
ket tolug6 of V-12 socket.
11) Transferredyellowleadfrom lug8 tolug6
of V-13 socket.
12) Removedspaghettiedjumperbetweenlugs 6
and 8 of V-13 socket.
13) Removedjumperwirebetween "lugs 6 and7
of V-l4 socket.
14) Transferredyellowlead from lug7 tolug3
of V-14 socket(lengthenedwire).
15) Transferredjumperwire from lug7 tolug6
of V-14 socket.
16) Removedwirebetween lug2 of V-16 socket
andlug6 of V-14 socket.
17) Transferred R-99(4.7meg.) from lug2 of V-.
16 tolug3 ofV14 socket.
18) Transferred R-37 (4.7K), from lugV-8 soc-
ket tothe electrolyticshield lug (B-).
19) Transferred all wiringfrom lug7 tolug6 of
V-10 socketexcept the yellowleadbetween
lug3 ofV-8 socket andlug7 of V-10 socket.
20) Added a yellow leadbetween lug6 of V-10
socket and electrolyticshield lug (B-).
21) Removedjumper wire between lugs 6 and7
of V-10 socket.
22) Inserted new leadsbetween the following
points:
a) Lugs 4 and5 ofV-6 socket tolug8 of V-13
socket.
b)Lug8 of V-13 socket tolug2 of V-17 socket.
c) Lug8 of V-13 socket tolug4 of V-12 socket.
d) -Lug 4 of V-12 socket tolug8 of V-ll socket.
e)Lug8 ofV-l socket tolug 7< of V-14 socket.
f) Lug7 of V-14 socket tolug2 of V-16 socket.
CODE MARKING — TRIANGLE 4A: Same
asfor codemarking Triangle 4,but includes built-
in (internal) antenna and following revisions:
1) Replacedjumperleadbetween pin7 (cathode)
of V-9 and terminal strip with r.f. choke L-l
part no. 705002.
2) Inserted C-17 (1500 mmf.) between pin7 of
V-8and chassis.
CODE MARKING — TRIANGLE 4W: Same
asfor codemarkingTriangle 4,but includes im-
provedmechanical focus and centeringusing
"wobble plate," and following revision?:
1) Removed endof R-26 (3.9K) connected to
chassis; rewired toB+ 125-volt point.
2) Transposed «rid resistors R-51 (270K) and
R-82(470K) of V-17.
3) Removed R-102 (10K) from B+ 180-volt
point; rewired to B+ 125-volt point.
CODE MARKING — TRIANGLE 5: Includes
all revisions listed undercodemarkings tri-
angle 4, Triangle 4A,and Triangle 4W.
CODE MARKING — TRIANGLE 4Nor 5N:
Same asfor codemarkingsTriangle 4 or Trian-
gle 5,but with different horizontaloutputtrans-
former T-9, part no. 738026, replacingpart no.
738038, and following change:
1)R-102 (10K) wired toB+ 180-voltpoint.
CODE MARKING — QP: Chassis 120113B,
used in Models 644and 647, mayusea type 12-
QP4 in place ofthe type 12LP4 kinescope. The
letters QP stampednext tothe triangularcode
markingdenote theuseof thistube. Ths compo-
nens used in suchreceivers will differ totheex-
tent indicated below:
SYMBOL
L-10
L-8, L-9
V-25
1-1
C-36, C-49
C-81
PART
Focuscoil
Deflection yoke
Kinescope
Anode cap
Ion trap
Filter condenser*
(Electrolytic)
Condenser
(.05 mfd.)
PART NO.
12LP4
708025
708130 or
708130R
810003
440011
708086
(Double)
925162
923062
12QP4
708033
708036
810O17
470490
708085
(Single)
925165
Not used
*Note that the markings on filter condenser C-36, C-49, part no.
925165differfromthose used on part no. 925162, shown in the
schematic diagram.
Circuit changes include the following:
1. C-81(.05mfd.) disconnectedfrom hor. size coil L-6.
2. C-63 (.0005mfd.) returned topin5 of V-l 9, instead of B—.
HIGH VOi-TAGE
RECTIFIER
V-18
IB3GT/80I6
955298
HORIZ. DAMPER
20
Fig. 5-12—High Voltage Power Supply—Chassis 120113B