Emerson 614 User manual

^Emerson Radio
7e/eMcn,
SERVICE MANUAL
MODELS 614-637-644-647-648B
Television Receivers
EMERSON RADIO AND PHONOGRAPH CORPORATION
111 EICHTH AVENUE NEW YORK 11, N. Y,
MODEL 61*
MODEL 637
MODEL 644
MODEL 647
MODEL 648B
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Emerson Radio
Par.
1
2
3
4
5
6
7
TABLE OF CONTENTS
SECTION 1— GENERAL DESCRIPTION
Pa e
1 Facilities
------
2 Specifications
SECTION 2— INSTALLATION
Preparation for Installation _____________
Antenna Installation ---------------------------------
Receiver Installation -----------------------------------
SECTION 3— OPERATION
Tunin
SECTION 4 — CIRCUIT DESCRIPTION
General _______ _ ___
Tuner ____________
Video Section ____
Deflection Section
SECTION 5— MAINTENANCE AND ALIGNMENT *
1 General ________ _ _____ _ __________ ____________________ 10
2 Chassis Removal _____________________________________ 10
3 Kinescope Replacement --------------------------------------------- 10
4 Mechanical Deflection Adjustments ________________ 10
5 Electrical Deflection Adjustments __________________ 11
6 Ali nment Test Equipment ___________________ ______ *12
7 Ali nment ________________________________________ _ 12
8 Volta e ‘and Resistance Analysis ___________________ 17
9 Deflection Circuit Waveforms _____________________ _ 17
10 Production Chan es ___________________________ _ _____ 19
11 Secondary Area Reception __________________________ 21
12 Cabinet Parts List _______________ ____________________ 21
13 Chassis Parts List ____________________________ _ _____ 22
Table
I
II
III
IV
V
LIST OF TABLES
DESCRIPTION
Tube Complements __________
Receiver Characteristics _____
Adjustments Control Settin s
Pa e
3
4
. 11
Generator Frequencies _ ____ . _______________________ 12
Audio I-F Ali nment
________ ... _____________________ 15
4VI Video I-F Ali nment
___________________________
16
VII Tuner Ali nment
________________________________
.... 17
VIII Deflection Waveform Test Points
______________
18
4LIST OF ILLUSTRATIONS
4Fi . DESCRIPTION Pa e
51-1 Front View of Chassis 120098B
_________________
3
1-2 Tube Location Dia ram _________________________- 4
1-3 Video, Audio, and Oscillator Frequencies
______
- 4
53-1 Front Panel Controls ___
________________________
5
53-2 Test Pattern, Correctly Adjusted
______________
— 6
3-3 Test Pattern, Tunin Misadjusted
______________
... 6
3-4 Test Pattern, Excessive Contrast ______________
6
3-5 Test Pattern, Excessive Bri htness
_____________ 6
73-6 Test Pattern, Vertical Hold Misadjusted
______
6
8
83-7 Test Pattern, Horizontal Hold Misadjusted __ 6
93-8 Test Pattern, Focus Misadjusted ________________ 6
93-9 Test Pattern, Weak Si nal
_____________________ 6
10 4-1 Block Dia ram— Chassis 120110B, 120113B 7
10 4-2 Schematic Dia ram of Tuner
__________________
8
5-1 Deflection Yoke and Focus Coil Adjustments
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
5-10
5-11
5-12
5-13
Combined Mechanical and Electrical Centerin ___ 11
Focus Coil Adjustments, Mechanical Centerin
___ 11
Schematic Dia ram Chassis 120110B ---------------- 13*,.14
Rear Deflection Adjustments ______________________ \2
Generator Matchin Network ------------- - -------------------- i2
Scope Detector Network _____________________ _— 12
Location of Ali nment Points ------ - ----------------- - ---- 15
Tuner Ali nment Points ------------------------------------------ 16
Side View of Tuner — - ----- - — - --------------------------------- 17
Volta e and Resistance Dia ram ------------------------- - 18
Sweep Circuit Waveforms ------ - --------------------------— 19
Hi h Volta e Power Supply, Chassis 120113B ------- 20
Bottom View of Chassis ---------------------------------------— 21
See Page 24 for information on Model 648B.
2
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Emerson R adio
LOW VQLTACE -
POWER SUPPLY PICTURE CENTERING
LEVER (FOCUS COIL} -
WOBBLE PLATE
LEVER , HI0H VOLTAGE
POWER SUPPLY
EFLECTION YOKE
ON-OFF VOLUME
AN CONTRAST
AU IO l-F
SECTION “
KINESCOPE
10 BP#
OR
I2LP4
VI EO l-F
SECTION
VERTICAL HOL TURRET
~ TUNER
BRIGHTNESS -
AM HORIZONTAL HOL
SELECTOR AN
f in e Tu n in g r
Section 1.
GENERAL ESCRIPTION
1. FACILITIES—Emerson Models 614, 637, 644,
and 647 are wide-band video receivers, providin di-
rect-view hi h-definition p.ctures on ten or twelve-inch
electro-ma netic deflection kinescopes. All models in
corporate several desi n features includin intercarrier
sound, AFC in the horizontal sync circuits, automatic
ain control, a series-type transformer power supply,
and internal antennas.
Models 614 and 637 employ Chassis 120110B;
Models 644 and 647 use Chassis 120113B. Both chassis
are basically alike; the latter is modified to accommo
date the lar er kinescope, type 12LP4 or 12QP4.
Model 614 is housed in a plastic cabinet, and Model
637 is contained in a wooden cabinet; both are table
model receivers usin a type 10BP4 picture tube.
Model 644 is housed in a table model cabinet; Model
647 uses a consolette-type of cabinet.
2. SPECIFICATIONS—
a. TUBE COMPLEMENTS: (Table 1).
NOTE: The tube complements of both chassis
are alike, except for the kinescope. Chassis 120113B
uses type 12LP4 kinescope; some chassis may be
equipped with a type 12QP4.
SYMBOL TUBE
TYPE FUNCTION
VI 6AG5 First video i-f amplifier
V2 1 6AG5 Second video i-f amplifier
V3 6AU6 Third video i-f amplifier
V4 6AL5 Video detector and AGC
V5 6AU6 First video amplifier
V6 12AU7 Second video amplifier; second
sync amplifier
V7 6AU6 Sound i-f amplifier
V8 6AU6 Sound limiter
V9 6T8 Sound disc, and audio amp.
V10 6V6GT Audio output
V ll 6SN7GT Hor. phase invert.; horizontal
control (d.c. amp.)
V12 6AL5 Hor. phase det. (sync disc.)
V13 6SN7GT Hor. oscillator and dischar e
V14 6SN7GT Vert, oscillator and dischar e
V15 12AU7 Sync sep. and d.c. restorer;
first sync, amplifier
V16 6K6GT Vertical output
V I7 6BG6G Horizontal output
V18 1B3GT Hi h-volta e rectifier
V19 6W4GT Horizontal damper
V25 jlOBP4* or
112LP4 #Kinescope
V27 6J6 Oscillator and converter
V28 6AG5 R-f amplifier
V29 5U4G Low-volta e rectifier
* Chassis 120110B # Chassis 120113B
Figure l-l— Front View of Ch ssis 12011 OB
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Emerson Radio
b. RECEIVER CHARACTERISTIS: (Table II).
ITEM DESCRIPTION
Volta e Ratin 105-125 volts, 60 cycles a.c.
Power Consumption All models— 190 watts
Current Drain
(At 117 volts a.c.) All models — 1.7 amps.
Frequency Ran e 54-88 MC.; 174-216 MC.
Intermediate Video — 25.75 MC.
Frequencies Audio — 4.5 MC.
Input Impedance 300 ohms, balanced
Channel Selection Twelve position, rotary turret
Chassis Models Models 614, 637 — Chassis
120110B
Models 644, 647 — Chassis
120113B
Audio Output 2.5 watts
9J5220
OSCILLATOR FREQUENCY
CHANNEL LIMITS 54
CHANNEL
AUDIO CARRIER
VIDEO CARRIER
66 V : 76
CH.2 CH.3 CH. 4
81 87 93
1 82 I 88
CH 5 CH 6
103 109
I
55.25 61.25 67.25 77.25 83 25
i • * 1 * 1 1 • II 6FM i
i
59.75 65.I51 71.75 1
81.75 1
87.75 LOW BAN
OSCILLATOR FREQUENCY
CHANNEL LIMITS 174 180 186 192 198
CHANNEL
AUDIO CARRIER
VIDEO CARRIER
CH.7 CH.8 CH.9 CH.IO CH.II CH.12 CKI3
201 207 213 219 225 231 237
204 | 210 | 216 | i | S
{789 1
I .0 1 - !
! 12 i1 13 1
L . J
1
179.75 1
185.75 1
191.75 1
197.75 1
203.75 1
209.75 1
215.75 HIGH BAND
175.25 18125 187.25 193.25 199.25 20525 211.25
Figure 1-3—Video, Audio, nd Oscill tor Frequencies
Section 2.
INSTALLATION
1. PREPARATION FOR INSTALLATION —
All models are shipped complete, with the kinescope
in place and all adjustments properly set. Present
models are equipped with internal antennas and me
chanical deflection centerin . Initial production mod
els do not include the built-in antenna and make use
of combined electrical and mechanical centerin .
2. ANTENNA INSTALLATION—Chassis 120110B
and 120113B are desi ned to operate with hi h sensi
tivity and will provide excellent reception in many
areas with the internal antenna. If performance in a b.
particular locality is unsatisfactory disconnect the
internal antenna and install a portable or an outdoor
antenna, dependin on reception conditions,
a. PORTABLE ANTENNA: Since surroundin
buildin s and other objects can block out televi- <
1
sion si nals, an indoor antenna should be tried
in different locations before decidin on a perma
nent position. Uncoil the transmission line from
the antenna base and connect to the terminals at
the rear of the chassis. Tune the antenna, after
turnin on the receiver and adjustin the con
trols, by rotatin and varyin the len th of the
telescopic arms for best reception. Both arms
should be adjusted to the same an ular position
and extended to the same len th.
PERMANENT ANTENNA: For outdoor an
tenna installations, use a dipole or an array with
a combination of elements. An Emerson Tele-Ray
antenna is recommended, for best results. A 300-
ohm transmission line is required for connection
to the receiver.
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Emerson R adio
3. RECEIVER INSTALLATION — Locate the re-
ceiver where a minimum of bri ht li ht falls directly
on the screen, althou h complete darkness is not recom
mended. Provide adequate ventilation by keepin the
back of the receiver away from the wall. Do not ob
struct the ventilatin slots at the rear of the cabinet.
All models are provided with a protective enclos
ure for the end of the kinescope. The enclosure is
fastened to the rear of the chassis. Care should be ex
ercised durin installation so as not to strike or jar
the enclosure.
After completion of antenna and power connec
tions, operate the receiver as outlined in Section III.
If a receiver fails to operate, or if operation is unsat
isfactory, proceed with the followin checks and ad
justments. CAUTION
Only experienced personnel should attempt to make
these adjustments, as hi h volta e of ten kilovolts
is present at the kinescope.
a. MECHANICAL ADJUSTMENTS: For all
models, remove the chassis back and check all
tubes to make certain they are firmly seated in
their sockets. Remove the kinescope enclosure
and check the seatin of the base plu . Inspect
the hi h-volta e anode connector.
The deflection yoke and focus coil have been prop
erly positioned at the factory. The kinestope should
be seated back a ainst the ed es of the deflection
yoke assembly. Inspect the assembly to make
certain that all adjustment win nuts are ti ht.
The ion trap should be positioned approximately
over the two internal fla s near the base of the
kinescope.
b. ELECTRICAL ADJUSTMENTS: An adapter
line cord is required to operate the receiver for
the followin preliminary adjustments.
1) Turn the OFF-VOLUME control a quarter-
turn clockwise to turn on the receiver. Set the
BRIGHTNESS control a half-turn clockwise
and turn the CONTRAST control countei-
clockwise. Allow the tubes to warm up.
2) Set the SELECTOR control to an active chan
nel and adjust the TUNING control for best
picture quality. A test pattern is preferable
for these adjustments.
3) Adjust the ion trap ma net by movin slowly
forward or backward while rotatin sli htly
around the neck of the kinescope to obtain
maximum picture bri htness. Reduce the
BRIGHTNESS control settin until the pat
tern is at approximately normal brilliancy. Ad
just the FOCUS control, at the rear of the
chassis, for maximum sharpness of raster lines.
Then readjust the ion trap for maximum bril
liancy.
4) Adjustment of the deflection yoke assembly is
required if the raster is not horizontal. Loosen
the center win nut and rotate the assembly
sli htly to correct this condition.
5) Centerin of the raster in the mask is con
trolled by both electrical and mechanical ad
justments, or by mechanical adjustments alone.
If this adjustment is required, refer to Section
V for operation of the chassis tontrols and po
sitionin of the focus coil.
6) All electrical adjustments at the rear of the
chassis have been set at the factory. If the set
tin s have been disturbed or if the kinescope
requires replacement, they must be carefully
readjusted in accordance with the procedure
outlined in Section V.
Section 3.
OPERATION
1. OPERATING CONTROLS—The operation and
function of the front-panel controls is identical for all
models. Seven controls are provided, as shown in fi 
ure 3-1.
2. TUNING—Tunin the receiver initially requires
operation of the various controls as indicated.
a. STATION SELECTION:
1) Turn the OFF-VOLUME control clockwise
approximately a quarter-turn. This turns the
receiver on and sets the sound volume to a
reasonable level.
2) Set the SELECTOR control so that the desired
channel number is indicated on the ed e of the
control. This control may be rotated in either
direction.
3) Allow approximately 15 seconds for warmup.
(This time is necessary to allow the tubes to
attain the proper temperature for operation.)
4) If the desired station is broadcastin , music or
speech will be heard. Adjust the TUNING
control for best picture quality. Readjust the
VOLUME or desired sound level.
5) Rotate the CONTRAST control to its extreme
counter-clockwise position.
AOUSTS RECEIVER
FOR BEST PICTURE
Figure 3-1— Front P nel Controls
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Emerson Radio
Figure 3-3— Test P ttern
Tuning Mis djusted
Figure 3-2— Test P ttern
Correctly Adjusted
Figure 3-4— Test P ttern
Excessive Contr st Figure 3-5— Test P ttern
Excessive Brightness
Figure 3-8— Test P ttern
Focus Mis djusted
Figure 3-7— Test P ttern
Horizont l Hold Mis djusted
Figure 3-9— Test P ttern
We k Sign l
Figure 3-6— Test P ttern
Vertic l Hold Mis djusted
6
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Emerson R adio
6) Rotate the BRIGHTNESS control to the max
imum counter-clockwise position and then ad
just slowly clockwise until li ht is just visible
on the screen. Rotate in reverse direction un
til li ht just vanishes.
7) Adjust the CONTRAST control until a pic
ture appears on the screen and desired con
trast is attained. A further reduction in the
BRIGHTNESS control settin may improve
the apparent contrast of the picture.
8) If the picture moves vertically or horizontally,
make the adjustment indicated in steps 9 and/
or 10.
9) Adjust the VERTICAL HOLD control until
the picture stops movin up or down. Proper
operatin settin of this control is in the cen
ter of the ran e over which the picture remains
stationary.
10) Adjust the HORIZONTAL HOLD control
until picture stops movin from side to side.
11) Readjust the CONTRAST control until the
desired picture intensity is obtained. It may
be necessary o readjust the BRIGHTNESS
control sli htly at the same time for optimum
brilliance.
12) After the receiver has been operatin for some
time, it may be necessary to readjust the TUN
ING control sli htly for best picture quality.
b. CHANGING STATION DURING OPERA
TION:
1) Set the SELECTOR control to the proper
channel number.
2) Readjust the TUNING control if necessary to
obtain best picture quality.
3) Readjust the CONTRAST control slowly un
til the desired picture quality is obtained.
4) Readjust VOLUME to suitable level.
5) Readjust BRIGHTNESS control for desired
brilliancy.
c. CHECKING OPERATION: The use of auto
matic frequency control in the sync circuits of
the receiver makes readjustments of the VER
TICAL HOLD and HORIZONTAL HOLD
controls infrequent provided the control set
tin s for proper operation are not disturbed.
Fi ures 3-2 throu h 3-9 indicate correct and
incorrect adjustment of the various controls.
Proper operation may be obtained by operation
of the associated control.
Section 4.
CIRCUIT ESCRIPTION
1. GENERAL—Chassis 120110B and 120113B are
basically alike; the latter is modified to accommodate
a 12-inch kinescope and contains some chan es in the
hi h-volta e power supply circuits. Both chassis con
tain twenty-three tubes includin the kinescope and
low-volta e rectifiers. The chassis use the intercarrier
method of sound reception, with the 4.5 me. audio i-f
produced by heterodynin the video and audio carriers
at the output of the video detector. The various sta es
of the receivers are indicated in the block dia ram, fi 
ure 4-1.
955295
Figure 4-1— Block Di gr m, Ch ssis 120110B, 120113B
7
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Emerson Radio
2. TUNER — The r-f unit constitutes a separate
sub-chassis of the receiver. This sub-chassis con
tains the r-f amplifier, converter, and oscillator
sta es. The channel switch, fine tunin control,
tuned circuits, and first video i-f transformer are
also contained on this chassis. Tunin and track
in adjustments for all twelve channels currently
in use are provided. The tuner serves to select
and amplify the desired video and audio frequen
cies and convert them to the carrier i-f frequencies
of 25.75 me. for video and 21.25 me. for audio.
No separation of these two intermediate frequen
cies is made, and the complete si nal is fed to the
first video i-f sta e.
The tuner uses a rotary turret carryin individ
ual coils for cach tuned circuit, for each channel
settin . A type 6AG5 (V28) serves as the r-f
amplifier and a type 6J6 (V27) as the converter
and oscillator. The r-f amplifier is a wideband,
tuned sta e whose output is inductively coupled
to the converter (V27). The oscillator (V27B)
operates in a Colpitts type circuit. Individual
slu s provide for ali nment of the oscillator on the
various channels. A variable-dielectric type of
condenser is used for fine tunin of the oscillator.
The output of the converter is conected to double
tuned first i-f transformer (T l).
The center-tapped primary (LI) of the r-f coil
is desi ned to match a balanced 300-ohm line. The
secondary (L2) is tuned by the input capacity of
V28 in series with the parallel combination of
trimmer A 14 and a 5 mmf. condenser. The output
of V28 is coupled to V27A by L3, which is tuned
by trimmer A15 and the output capacity of the
tube. A 10K resistor loads L3 to provide the
required band pass.
The input capacity of V27A and trimmer A 16
tune the converter coil (L4). The oscillator coil
(L5) is wound on the same form with L3 and
L4, for inductive couplin . The initial oscillator
frequency is fixed bv permeability tunin of L5
and the preset .5-3 mmf. trimmer. The frequency
is varied by means of the TUNING control (3-5
mmf. trimmer) which consists of a spiral-shaped
dielectric disc rotatin between fixed stator plates.
Figure 4-2 Schem tic Di gr m of Tuner
3. VIDEO SECTION—The video section consists
of the followin sections: video i-f; video detector and
automatic ain control; video amplifier and d.c. re
storer.
a. VIDEO I-F : Both the 25.75 me. video carrier
and 21.25 me. audio carrier are amplified by three
wide-band i-f sta es. The four tuned cicruits are
peaked at different frequencies, formin a sta er-
tuned system of relatively flat overall response to
produce the required bandpass.
Self-resonant, slu -puned coils are used in the
i-f transformers. Two sta er-tuned i-f trans
formers (T2, T3) follow the overcoupled first i-f
(T l). T2 is provided with a 21.25 me. trap to
8
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Emerson R adio
attenuate the audio i-f. An overcoupled i-f (T4)
completes the amplifier sta es and feeds the video
detector (V4).
The audio level is maintained just below the
point of interference with the video i-f. However,
the audio i-f is not completely rejected, as the audio
si nal is recovered (at the output ot the video de
tector) by heterodynin with the video i-f. The
4.5 me. beat between the video and audio inter
mediate frequencies is obtained from the shunt-
tuned circuit consistin of L2 and C79 and is fed
to the first audio i-f amplifier (V7).
b. VIDEO DETECTOR AND A.G.C.: The video
detector (V4A) rectifies the ne ative portion of
the video i-f. The resultant si nal is coupled
throu h peakin coil LI to the rid of the first
video amplifier (V5). V5B acts as the automatic
ain control and develops a delayed ne ative A.G.C.
volta e which is used to bias the first two video
i-f sta es and the r-f amplifier.
c. VIDEO AMPLIFIER: The video amplifier con
sists of two sta es (V5 and V6A). The second
sta e is series-peaked and is coupled to the rid
of the kinescope (V25) and the sync separator
and d. c. restorer (V I5A). The output si nal of
V5 is varied by the CONTRAST control (R19)
which varies the bias of V5, to control the si nal
input to V6A.
d. D. C. RESTORER AND SYNC CLIPPER:
The output of the video detector contains both a.c.
and d.c. components of the video si nal, as well
as the blankin and sync pulses. Since the video
amplifiers will not pass the d.c. component of the
video si nal, the back round level of the picture
will vary. The d.c. restorer (VI5A) develops a
bias volta e across R24 which varies with the
avera e video si nal level. This bias volta e is
fed to the rid of the kinescope, thus maintainin
the proper bri htness level. The video sync pulse
output of VI5A, developed across R28, is coupled
throu h C22 to the first sync amplifier (V15B).
4. DEFLECTION SECTION—The sync and sweep
sta es produce and control the deflection of the elec
tron beam in the kinescope. The horizontal sweep cir
cuits incorporate a horizontal phase detector (sync
discriminator) to maintain automatic sync with the
horizontal pulses of the video si nal.
a. SYNC AMPLIFIER AND INVERTER: The
sync pulse output of V I5A is amplified by two
triode sta es (V15B and V6B) and fed to the
horizontal phase inverter (VI1A). ^he inte rat
in network of the vertical deflection circuit is
coupled to the output of V I1 A, which provides
push-pull output for the horizontal sync discrimi
nator (V12).
b. HORIZONTAL SWEEP: The horizontal de
flection circuits contain an automatic frequency
stabilizin arran ement which improves stability
and ease of operation. The phase inverter (V I1 A)
feeds the horizontal sync pulses to the horizontal
phase detector (V12). At the same time, V12
receives volta es fed back from the horizontal out
put (V17) throu h C58. Any phase shift between
the horizontal sync pulses and the horizontal os
cillator si nal will cause the input volta e applied
to one diode section of V12 to differ from that of
the other and result in a d.c. bias volta e on the
rid of the horizontal control tuoe (V Ilb ). This
bias volta e will be proportional to the phase dis
placement between the incomin sync pulses and
the horizontal oscillator volta e and of a polarity
determined by the lead or la of the oscillator fre
quency. The plate resistance of VIIB is part of
the bias network of the rid circuit of the horizon
tal oscillator (VlJ). The output of the phase de
tector (V12) will thus synchronize the oscillator
to the horizontal pulses of the video si nal.
The horizontal blockin oscillator (V I3) operates
at a. frequency determined by C57, R75, R76, and
the plate resistance of VIIB. The horizontal sync
pulses cause V13 to lock in at the sync irequency
when the HORIZONTAL HOLD control (R75)
is properly adjusted. The sweep volta e output
of V13 is developed across R79 and is ted to the
horizontal output tube (V I7). The si nal level
to the horizontal output tube is adjusted by the
HORIZONTAL DRIVE control, R80.
V19 supplies the required drivin power for the
horizontal deflection coils (L9). ihe output of
V17 is coupled to the horizontal deflection coils
throu h output transformer T9. A portion of the
output transformer secondary is shunted by the
HORIZONTAL SIZE control L6. By varyin
the inductance of L6, the horizontal sweep current
may be controlled.
The horizontal damper tube (V I9) acts to damp
out oscillations which occur over part of the hori
zontal scannin cycle. The HORIZONTAL LIN
EARITY control (L7) helps provide a linear
trace. V19 is a type 6W4 to eliminate the need
for a separate damper filament windin ,
c. VERTICAL SWEEP: Vertical oscillator V14 is
free-runn.n and operates at a frequency determ
ined by C71, R95, and the VERTICAL HOLD
control (R94), in the absence of a vertical sync
pulse. The inte rated sixty-cycle sync pulse de
rived from the video si nal reaches the rid of
V14 just before it would normally trip. This sync
pulse is reat enou h to drive the tube to conduc
tion and cause it to lock-in at the sync frequency.
The sync pulse thus maintains control of the verti
cal oscillator sweep frequency when R94 is cor
rectly adjusted.
The output of V14 is fed to the vertical outptu
sta e (V16) throu h C72. The output of V14 is
controlled by the VERTICAL SIZE control
(R96). R100 varies the operatin point of V16
by varyin the bias, actin as the VERTICAL
LINEARITY control. The sweep volta e of V16
is coupled to the vertical deflection coils (L8) by
means of the vertical output transformer (T il).
5. POWER SUPPLIES — Two power supplies are
used to supply the required volta es. The low volta e
supply uses a transformer and full-wave rectifier* The
hi h volta e supply for the kinescope is of the fly-back
lype and is ener ized by the horizontal output tube,
a. HIGH VOLTAGE SUPPLY: The hi h volta e
power supply makes use of the ener y supplied to
th$ horizontal output transformer by VI7. When
the plate current of V I7 is cut off at the instant
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Emerson R adio
of retrace of horizontal scannin , the field built
up in the .primary collapses and induces a hi h-
volta e. This volta e is applied to the hi h-volta e
rectifier (V18). From 8.5 to 10 kilovolts is pro
duced by the power supply. The rectified volta e
is filtered by C63 and R89, and applied to the
second anode of the kinescope. Chassis 120113B
differs from Chassis 1201 IB in that C63 is return
ed to B—, instead of the plate of VI9.
b. LOW VOLTAGE SUPPLY: The low-volta e
supply uses a full-wave rectifier (V29) and trans
former (T12). A series arran ement is used to
supply plate volta e, to reduce current require
ments. As a result, separate filament windin s
are used to keep the heater-cathode potentials
within ratin s, and the electrolytic filter conden
sers are not rounded to the chassis. The center-
tap of T12 is not rounded but is ne ative (B— )
with respect to round. The cathodes of the sweep
circuit and video amplifier tubes are ne ative to
round (about -205 volts) and the heaters are
conected to the un rounded filament windin (Y ).
6. INTERCARRIER SOUND—The audio circuits
are conventional. The 4.5 me. heterodyne between the
video and audio i-f carriers is taken from the shunt-
tuned circuit (L2, C79) at the output of the video de
tector (V4). The 4.5 me. si nal is amplified by the
audio i-f amplifier (V7), whose output is coupled to
the limiter (V8). V8 feeds the discriminator (V9A) ;
the output of the discriminator is amplified by V93,
ana tne audio output (V10).
7. DEFLECTION YOKE AND FOCUS COIL
ASSEMBLY: The deflection yoke and focus coil
form a complete assembly. The yoke contains the
vertical and horizontal deflection coils (L8 and
L9). The focus coil (L10) combines a permanent
ma net with the electroma net (PM and EM).
The yoke and focus coil are independently ad
justable.
Vertical centerin is accomplished by mechani
cal adjustment of the focus coil; horizontal center
in is done electrically by the HOR. CENTER
ING control (R103). Later production of Chas
sis 12011 OB and 120113B makes use of a pivoted
mountin for the EM-PM focus coil, to ether
with a “wobble plate” to provide for mechanical
adjustment of horizontal and vertical centerin .
The “wobble plate” consists of a rin of perme
able material (steel) surroundin the neck of the
kinescope, adjacent to the EM-PM focus coil.
The plate may be moved in a plane at ri ht-an les
to the axis of the kinescope, both vertically and
horizontally, by means of a slotted section and
lever. In addition, the focus coil may be tilted in
bqth directions by means of a second lever which
is adjustable from the rear of the cabinet, without
removin the back. This enables precise mechani
cal control of centerin .
Section 5.
MAINTENANCE AN ALIGNMENT
1. GENERAL—All adjustments must be made only
by qualified service technicians. Unsatisfactory oper
ation should be analyzed and circuits checked syste
matically to locate and correct sources of trouble.
WARNING
Hi h volta es in excess of -8000 volts are present
in the chassis, durin operation. Exercise care in
servicin the receiver, when ener ized. Do not
remove, handle, or replace the kinescope unless
loves and o les are worn.
2. CHASSIS REMOVAL—To remove the chassis,
follow the outlined procedure.
a. Pry off all control knobs.
b> Remove the six screws which fasten the back in
place.
c. Remove the speaker plu .
d. Remove the four chassis bolts and carefully slide
the chassis from the cabinet. When invertin the
chassis, place a supportin block under the power
transformer.
3. KINESCOPE REPLACEMENT —
CAUTION
Before removin the kinescope, dischar e the tube
by connectin an insulated test prod to the chassis
and to the hi h-volta e anode. Wear loves and
o les before handlin the tube.
To remove the tube, proceed as follows:
a. Disconnect the hi h-volta e lead at the top of the
kinescope and dischar e the tube.
b. Remove the enclosure which protects the base of
the kinescope.
c. Remove, the tube socket and slide off the ion trap.
d. Loosen the hold-down strap at the front of the
tube and carefully withdraw the kinescope for
ward from the deflection yoke and focus coil as
sembly.
To install a new kinescope, follow the above pro
cedure in reverse. Make certain that the tube is
seated a ainst the ed es of the deflection yoke
assembly, with the hi h-volta e anode connection
at the top. In replacin the ion trap, position the
unit so that the arrow points towards the front of
the chassis. NOTE
Whenever the kinescope is removed or replaced,
the mask should be carefully cleaned with a soft,
lintless cloth. Do not use carbon tetrachloride or
any cleanser containin abrasive material. The
face of the kinescope should also be wiped clean,
before replacin the chassis in the cabinet.
4. MECHANICAL DEFLECTION ADJUST
MENTS — See fi ure 5-1. Replacement of the kine
scope or of any of the components of the deflection
system will require readjustment of the deflection yoke
assembly, focus coil, and ion trap.
NOTE
Before makin any deflection adjustments, make
certain that the enclosure is in place, coverin
the base of the kinescope, and is firmly fastened.
The adjustments to the focus coil can be made
throu h openin s provided in the enclosure.
10
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Emerson R adio
m
m
STEP CONTROL SYMBOL ADJUSTMENT
1Vertical
Size R-96 Affects bottom section of
raster and overall size. Ad
just to fill the mask verti
cally (hei ht).
2Vertical
Linearity R-100 Affects top section of ras
ter and overall size. Adjust
for best linearity.
3Horizontal
Drive R-80 Controls si nal to horizon tal output V-19. Adjust for
best linearity.
4Horizontal
Linearity L-7 Affects linearity of left and center sections of raster. Ad
just in conjunction with
R-80, for best linearity.
5Horizontal
Size L-6 Adjust to fill the mask
horizontally (width).
6Horizontal*
Centerin R-103 Adjust to center raster hor
izontally.
7Focus R-55 Controls current throu h fo
cus coil L-10. Adjust for
sharpest line detail.
too close to the deflection yoke as the ran e of
adjustment of the FOCUS control (R55) will
be limited.
To center the raster for models provided with
a “wobble plate” and focus levers, proceed as fol
lows (See fi ure 5-2):
1) Adjust the focus lever to make the focus coil
concentric with the neck of the kinescope.
Loosen the three mountin nuts (Bl, B2, B3)
sli htly, if required.
2) Loosen the sin le wobble-plate mountin screw
(A) and slide the plate vertically or horizontal
ly, by means of the lever, to approximately cen
ter the raster. Ti hten the mountin screw.
3) Readjust focus coil lever, if required, to ex
actly center the raster in the mask. Both hori
zontal and vertical adjustments are made si
multaneously. Ti hten the mountin nuts (Bl,
B2, B3) after positionin .
4) Note that normally only the vernier adjust
ment (focus coil lever) is required, unless the
kinescope has been replaced. The wobble-
plate lever has been initially positioned at the
factory and usually will not require readjust
ment.
c. ION TRAP: Adjust the position of the ion trap
as outlined in Section II.
5. ELECTRICAL DEFLECTION ADJUSTMENTS
— The electrical adjustment controls are located at
the rear of the chassis. For access to the adjustment
controls, remove the cabinet back. Use an adapter
line-cord to complete the a-c. power connections, with
the back removed.
Before proceedin with adjustment of the rear
controls, tune in a test pattern and set the front panel
controls for the best picture, as outlined in Section III.
Complete the adjustments of the deflection yoke and
focus coil before settin the electrical controls. Adjust
the controls in the order indicated.
a. ADJUSTMENT CONTROL SETTINGS:
(Table III).
Figure 5-2— Focus Coil Adjustments, Mech nic l Centering
b. EM-PM FOCUS COIL: For models not provid
ed with a “wobble plate,” adjust the upper screw
(C l) of the focus coil to center the raster ver-
, tically. Sli ht variation of the two side screws
(C2, C3) may be required to complete the adjust
ment. The focus coil should not be positioned
Figure 5-1— Deflection Yoke nd Focus Coil Adjustments,
Combined Mech nic l nd Electric l Centering
a. DEFLECTION YOKE: If the raster lines are
not horizontal, loosen the center win nut (A l)
and rotate the yoke coil assembly to correct the
condition. Ti hten the win nut firmly.
The position of the assembly alon the axis of the
kinescope is fixed by the two outer win nuts (Bl,
B2). The yoke should be positioned approxi
mately at the center of the slots.
11
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Emerson R adio
Proper adjustment of the HORIZONTAL and
VERTICAL LINEARITY controls, and the SIZE
controls should result in test patterns in which the
circles are round and the wed es are linear and equal.
The test pattern circles should be concentric with the
curved sides of the mask.
955282
CHANNEL VIDEO
CARRIER
M C
AUDIO
CARRIER
MC.
255.25 59.75
361.25 65.75
467.25 71.75
577.25 81.75
683.25 87.75
7175.25 179.75
8181.25 185.75
9187.25 191.75
10 193.25 197.75
11 199.25 203.75
12 205.25 209.75
13 213.25 215.75
TO
GEN
120
- A / W
50 TO
RECEIVER
Figure 5-4— Re r Deflection Adjustments,
*For ch ssis not equipped with wobble pl te nd
centering lever.
6. ALIGNMENT TEST EQUIPMENT — Proper
servicin and ali nment of Chassis 120110B and 120-
113B requires the equipment indicated.
a. SWEEP GENERATOR:
1) Frequency ran es of 18 to 30 MC., 50 to 90
MC., and 170 to 225 MC.
. 2) Sweep width variable to 10 MC.
3) Output of at least 0.1 volt, with an attenuator
for adjustment of output.
4) Constant output over sweep width, with flat
output on all ran es and at all attenuator posi
tions.
5) Output impedance of 300 ohms, for r-f ali n
ment, or matchin network. See fi ure 5-5.
b. MARKER GENERATOR:
1) Frequency ran es of 4 to 30 MC. and 50 to
225 MC., for i-f and r-f ali nment. The mark
er enerator must provide an accurate (crystal
calibrated) frequency of 4.5 MC. for audio i-f
ali nment, and accurate frequencies from 21.25
MC., to 25.75 MC., for video i-f ali nment.
The required r-f requencies from 50 to 225
MC., as tabulated below, may be provided by
a calibrated si nal enerator or a heterodyne
frequency meter with crystal calibrator.
2) Output of at least 0.1 volt, with an attenuator
for adjustment of output.
GENERATOR FREQUENCIES: (Table IV).
d.
e.
-------- 4 ------ V V \/ ------------ -
120
USE CARBON RESISTORS ONLY.
Figure 5-5— Gener tor M tching Network
VACUUM-TUBE VOLTM ETER:
1) A diode .probe for hi h-frequency measure
ments is desirable.
2) Hi h input impedance with provision for low-
volta e measurement (three or five volt scale).
OSCILLOSCOPE:
1) Vertical input should be provided with a cali
brated attenuator and low-capacity probe.
2) Flat vertical amplifier frequency response, with
ood low frequency response.
3) Adequate vertical sensitivity.
SCOPE DETECTOR: Required for ali nment of
over-coupled first i-f Tl. See fi ure 5-6.
TO TEST POINTS
IN RECEIVER
(KEEP LEA S 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. Use an adaptor line cord
to operate the receiver.
2) Set the CONTRAST control at the center of
rotation and retain at this settin for all i-f
adjustments.
3) The waveforms shown in the response curves
may be inverted dependin on the number of
amplifyin sta es in the vertical amplifier of
the scope bein used.
4) When the marker si nal is coupled in parallel
with the sweep enerator, the si nal should be
unmodulated and attenuated so that only a
small pip is visible. Use an accurate, crystal-
controlled marker enerator.
5) Connect the sync sweep volta e from the sweep
si nal enerator to the horizontal input of the
scope for horizonal deflection. ^
6) Refer to fi ure 5-7 for location of ali nment
points; fi ure 5-3 for the schematic dia ram.
7) Set the receiver to Channel 3.
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Emerson Radio
^ Figure 5-3— Scheme
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Emerson Radio
iOUNO DISC*
*
itic Jbi gr m, Ch ssis 120110B
14
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p
Emerson Radio
Figure 5-7— Loc tion of Alignment Points
AUDIO I-F ALIGNMENT: (Table V ).
STEP SIGNAL GENERATOR INPUT MEASURING
INSTRUMENT ADJUST PROCEDURE RESPONSE CURVES
CONNECTION FREOUENCY
1Marker enerator
throu h .001
mfd. to pin 2 of
V4. Low side
to B— .
Marker-—4.5
MC. Connect v.t.v.m.
Connect v.t.v.m.
to junction of
R38 and C27.
Low side to B— .
C79 Peak for maximum re
sponse. Adjust enerator
input to produce one volt
readin on v.t.v.m.
299 Marker— 4.5
MC.
99 T5
(Top and
bottom)
Peak for maximum
response
3Connect sweep
enerator in
parallel with
marker en.
Sweep— 4.5
MC. (450 KC.
sweep) Marker
— 4.5 MC.
Replace v.t.v.m.
with scope con
nected throu h
10K resistor to
junction of R44
and C31.
T6
(Bottom) Position 4.5 MC- marker
at center of S-curve, by
adjustin secondary
bottom.
'• * •
♦150 KC.
4.5 MC. /
499 99 99 T6
(Top) Peak primary for maxi
mum amplitude and
linearity. Repeat step 3. ^ /^ I5 0K C .
b. VIDEO I-F ALIGNMENT:
1) Retain the control settin s used for audio i-f
ali nment.
2) Connect a 3 volt bias battery from the junction
of Rl, R6, and R ll (ne ative terminal), to
chassis (positive terminal) for step 5.
3) Shape the overall response curve, after indi
vidual peakin of sta er-tuned and over
coupled i-f transformers. Maintain output of
the sweep and marker enerators at a mini
mum, to prevent distortion of the response
curve.
15
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Emerson Radio
VIDEO I-F ALIGNMENT: (Table VI).
STEP SIGNAI GENER
CONNECTION
ATOR INPUT
FREQUENCY
MEASURING
INSTRUMENT ADJUST PROCEDURE RESPONSE
CURVES
1 Li htly couple
marker en. to
pin 1 of V3;
Sweep en. from
pin 1 to chassis,
rhrou h .001 mfd.
Sweep-23.5 MG.
(10 MC. sweep)
Marker-25.75
MC.
Connect vertical
input of scope
throu h 10K re
sistor to junction
of LI, R16,
and C16. Low
side to chassis.
T4
(Top and
bottom)
Set marker as shown on
response curve; marker
should be 10% down. Ad
just sweep enerator in
put to produce one volt
at junction of L l, R16,
and C16.
25.75 MC.M ARK ER
/ BAND WIDTH \
/ 4.7 MC \
2Connect marker
and sweep ener
ators to pin 1
of V2, throu h
.001 mfd. Low
side to chassis.
Sweep-23.5 MC.
(10 MC. sweep)
Marker-25.25
MC.
99 T3 Set 25.25 MC. marker as
shown on response curve.
I 25.25MC.
/T \ MARKER
/ \
3Sweep enerator
coupled to con
verter (V27) in
put, usin three
turn loop slipped
over tube. Marker
en. in parallel.
Low side to
chassis.
Sweep - 23.5 MC.
(10 MC. sweep)
Marker-25.75
MC.
Connect scope
throu h detector
network to pin 1
of V2. Low side
to chassis.
T1
(L7 and
L9)
Set marker as shown on
response curve.
J25.75MC. \
/■ MARKER \
/ BANDWIDTH \
___ L ______ ± . ______ \ ___
/Jl22.80 MC.
/ n MARKER
/
4»Sweep - 23.5 MC.
(10 MC. sweep)
Markers-
22.8 and
21.25 MC.
Connect scope
throu h detector
network to pin 1
of V3. Low side
to chassis.
T2
(Top and
bottom)
Adjust primary of T2
(top) to position 22.8
MC. marker; adjust T2
trap (bottom) to position
21.25 MC. marker.
599
Connect AGC
bias battery as
indicated above.
Sweep-23.5 MC.
(10 MC. sweep)
Marker s-
25.75 MC.
and 22.25
MC.
Connect scope
throu h 10K re
sistor to junction
of Ll, R16 and
Cl 6. Low side to
chassis.
T2,
T3 Adjust T2 (top) and T3
to ive overall response
shown. T2 (top) adjusts
bandwidth; T3 positions
video carrier (25.75 MC.)
dependin on accuracy of
adjustment of T l (25.75
MC. marker).
25.75Mclr \12 2.25 MC.
m a rk er /) \ marker
/ BANDWIDTH \
/ 3.5 MC \
VIDEO I-F ALIGNMENT: (Table VI).
c. TUNER ALIGNMENT:
1) Set fine tunin control to center of rotation.
Retain this settin or entire r-f ali nment.
2) Retain control settin s previously used.
3) Couple marker enerator in parallel with sweep
enerator.
4) Use 10 inc. sweep for sweep enerator. Couple
enerator to antenna terminals of receiver. If
the sweep has a 50 ohm, unbalanced output,
connect to the antenna terminals throu h net
work shown in fi ure 5-5.
5) Connect vertical input of scope in series with
10K resistor to junction of LI, R16, and C16.
6) Refer to fi ure 5-8 for tuner ali nment points,
and fi ure 4-12 for the tuner schematic.
7) A14, A15, Al6 are r-f amplifier and converter
trimmers and are adjusted on Channel 12;
A13-A2 are oscillator slu s for the correspond
in channels. Figure 3-8— Tuner Alignment Points
L*9
mo.y R-F AMPLIFIER
6AG5
OSCILLATOR AN CONVERTER 6J 6-
R-F AMP. OUTPUT TRIMMER A-14
CONVERTER TRIMMER A-l«
FINE TURIN©
CAPA6IT0R -
3-5 MM F.
OSCILLATOR A JUSTMENT
A 2 - A13
16
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Emerson Radio
TUNER ALIGNMENT: (Table VII).
STEP SIGNAL GENERATOR INPUT CHANNEL ADJUST PROCEDURE
SWEEP GEN. MAR. GEN.
1207.0 MC. 209.75 MC. 12 A12 Adjust for placement of 21.25 MC. marker
as per overall response curve.
2»12 A14,
A15,
A16
Adjust shape of overall response curve for
maximum amplitude and bandwidth.
3213.0 MC. 215.75 MC. 13 A13 Adjust as in Step 1.
4201.0 MC. 203.75 MC. 11 A ll »
5 195.0 MC. 197.75 MC. 10 A10 »
6 189.0 MC. 191.75 MC. 9 A9
7183.0 MC. 185.75 MC. 8 A8
8177.0 MC. 179.75 MC. 7 A7 »
985.0 MC. 87.75 MC. 6 A6 99
10 79.0 MC. 81.75 MC. 5 A5 99
11 69.0 MC. 71.75 MC. 4 A4 99
12 63.0 MC. 65.75 MC. 3 A3 99
13 57.0 MC. 59.75 MC. 2 A2 99
NOTE: The r-f response curve of the tuner, on each channel may be observed by connectin the scope in series with a 10K
resistor to the test point shown in fi ure 5-9. The curves should have maximum amplitude and flatness, consistent with
proper placement of the 21.25 me. marker on the i-f response curve.
8. VOLTAGE AND RESISTANCE ANALYSIS—
Volta e and resistance readin s are indicated in fi ure
5-10, to aid in servicin the chassis. The dia ram indi
cates typical values obtained under the followin con
ditions.
a. ANALYSIS CONDITIONS:
1) Line volta e maintained at 117 volts for volt
a e readin s.
2) Measurements made with voltohmyst or equiv
alent.
3) All volta e measurements are in + d.c. volts
and resistance in ohms, unless otherwise noted.
4) Socket connections are shown as bottom v:ews.
Measured values are from socket pin to B—,
unless otherwise stated.
5) Readin s made with antenna disconnected, no
si nal applied and controls at normal.
6) Readin s marked * are measured to round.
9. DEFLECTION CIRCUIT WAVE FORMS —
See fi ure 5-11. The sweep volta es produced in the
horizontal and vertical sweep circuits may be used in
locatin defects in the deflection section of the chassis.
Two separate wave forms are shown" at various test
points up to the output of the second sync amplifier
(V6B), as both horizontal and vertical pulses are pres
ent. Different sweep frequencies are required at the
scope to distin uish between the sync pulses.
a. ANALYSIS CONDITIONS:
1) Line volta e maintained at 117 volts.
2) Controls at normal; no si nal input.
3) Peak-to-peak values indicated may vary due
to component tolerances and response of scope.
Readin s are obtained by calibration of scope,
prior to observation of waveforms.
Figure 5-9— Side View Tuner
10. PRODUCTION CHANGES— Several chan es
have been incorporated in the chassis used in Models
614, 637, and 644, durin production. These chan es
may be identified by code markin s consistin of a tri
an le containin a particular number, stamped at the
rear of the chassis. Presence of a particular markin
indicates that the revisions described have been made
in the chassis. The various revisions are summarized
below. Unless otherwise noted, the chan es have been
added to all subsequent models.
R-F AMP
' 6AQS
TEST POINT
ft-F OUTPUT, CONV.
AN OSC. COILS
(L-3,L-4,L-5*
R-F INPUT
COILS
CL-l»L-2)
17
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Emerson R adio
i9 55297
DEFLECTION WAVEFORMS: (Table VIII).
TUBE TEST
POINT
HORIZONTAL VERTICAL
KEY
LETTER PEAK to PEAK
VOLTAGE KEY
LETTER PEAK to PEAK
VOLTAGE
Sync Separator
V-15A Pin 3 AH 22.3 A V 36.6
Pin 1 BH 8.9 BV 11.3
First Sync. Amp.
V-15B Pin 6 CH 11.4 CV 18.5
Second Sync. Amp.
V-6B Pin 6 DH 77.4 DV 117
Hor. Phase Inv.
V -llA Pin 2 EH 19.0 EV 40.2
Phase Det.
V-12 Pin 5 GH 8.7 GV 9.7
Pin 7 H H 6.0 H V 9.2
Hor. Control
V -llB Pin 5 IH 14.5
---- ----
Hor. Osc.
V-13 Pin 5 JH 55.4
---- ----
Pin 1 KH 53.5
---- ----
Vert. Osc.
V-14 Pin 4
---- ----
LV 178
Pin 2
---- ----
MV 100
Vert. Output
V-16 Pins 3, 4
---- ----
N V 303
18
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Emerson R adio
k l
v v
W
Figure 5-11— Deflection Circuit W veforms
a. CODE MARKING — E: Part No. 925162, C21,
C36, and C49; C49 (80 mfd.) is marked A, ^nd
C21 (10 mfd.) is marked O due to incorrect con
denser markin , instead of markin s shown on
schematic dia ram:
b. CODE MARKING — C: No Pyramid paper
tubular condensers used.
c. CODE MARKING-TRIANGLE 1: Revisions
to correct picture flicker.
1) Removed red lead from B+ 125-volt point on
terminal strip near fourth i-f and from pin 6
of V-5 (6AC6). Removed red lead from the
40 mfd. (□ ) terminal of C-42 and from pin
6 of V-5 (6AU6).
2) Inserted a jumper from the B+ 125-volt point
on the terminal strip near fourth i-f to the
40 mfd. ( □ ) terminal of C-42.
3) Removed one end of R-28 (47K) from pin
6 of V-5 (6AU6); rewired to B+ 125-volt
point on terminal strip near fourth i-f.
4) Removed R-27 (33K) from B+ 125-volt point
on terminal strip near V-12 and V-13, and
from the junction of the blue lead with the
10 mfd. (A) terminal of C-21, on the terminal
strip near V-6 and V-15. Rewired R-27 be
tween pin 6 of V-5 (6AU6) and the empty
lu on the terminal strip adjacent to the power
transformer; added a wire from this point to
the junction of R-52, 470,000 ohms, and the
reen lead from the fuse holder.
5) Opened junction of blue lead from C-21 with
R-26 (3900 ohms) on the terminal strip near
V-6 and V-15.
6) Rewired R-26 to chassis; rewired blue lead
from C-21 to pin 6 of V-5.
d. CODE MARKING — TRIANGLE 1J : Includes
revisions covered by code markin Triangle 1, plus
chan es to correct picture weave as detailed in
code markin Triangle 4.
e. CODE; MARKING — TRIANGLE 2: Includes
revisions covered by code markin Triangle 2y plus
chan es in vertical deflection circuit detailed un
der code markin Triangle 4.
f. CODE MARKING — TRIANGLE 3: Same as
for code markin Triangle 2, but includes both
horizontal and vertical circuit revisions outlined
in code markin Triangle 4.
. CODE MARKING — TRIANGLE 4: Includes
revisions covered by code markin Triangle 1, plus
additional chan es to eliminate picture weave, as
follows:
19
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Emerson Radio
h.
1) Added a sin le lu terminal strip between soc
kets V-l and V -ll.
Transferred junction of R-66 (4.7K), R-67
(2.2K), and C-53 (.001 mfd. mica) from dum
my lu under vertical output transformer to
new dummy lu terminal.
Transferred wirin from lu 8 of V I1 socket
to the empty lu on terminal strip under verti
cal output transformer.
Removed jumper wire connectin lu s 3 and
4 of V-6 socket.
Transferred jumper wire located between cen
ter shield pin and lu 4 of V-6 socket to lu
3 of V-6 socket.
Transferred yellow lead from hi 5 to lu 3
of V-6 socket.
Removed yellow lead between lu 3 of V -l3
socket and lu 2 of V -l7 socket.
8) Transferred R-51 (270K) from lu 2 of V-17
Socket to lu 3 of V -l3 socket.
Cut jumper between center shield pin and lu
4 of V-l2 socket.
10) Transferred all wirin from lu 4 of V -l2 soc
ket to lu 6 of V-l2 socket.
11) Transferred yellow lead from lu 8 to lu 6
of V -l3 socket.
12) Removed spa hettied jumper between lu s 6
and 8 of V-13 socket.
13) Removed jumper wire between lu s 6 and 7
of V-l4 socket.
14) Transferred yellow lead from lu 7 to lu 3
of V-14 socket (len thened wire).
15) Transferred jumper wire from lu 7 to lu 6
of V-14 socket.
16) Removed wire between lu 2 of V-16 socket
and lu 6 of V-14 socket.
17) Transferred R-99 (4.7 me .) from lu 2 of V-
16 to lu 3 of V14 socket.
18) Transferred R-37 (4.7K), from lu V-8 soc
ket to the electrolytic shield lu (B-).
19) Transferred all wirin from lu 7 to lu 6 of
V-10 socket except the yellow lead between
lu 3 of V-8 socket and lu 7 of V-10 socket.
20) Added a yellow lead between lu 6 of V-10
socket and electrolytic shield lu (B-).
21) Removed jumper wire between lu s 6 and 7
of V-10 socket.
22) Inserted new leads between the followin
points:
Lu s 4 and 5 of V-6 socket to lu 8 of V-13
socket.
Lu 8 of V-13 socket to lu 2 of V-17 socket.
c) Lu 8 of V-13 socket to lu 4 of V-12 socket.
d) Lu 4 of V-12 socket to lu 8 of V -ll socket.
e) Lu 8 of V-l socket to lu 7 of V-14 socket.
f) Lu 7 of V-14 socket to lu 2 of V-16 socket.
CODE MARKING — TRIANGLE 4A: Same
as for code markin Triangle 4, but includes built-
in (internal) antenna and followin revisions:
1) Replaced jumper lead between pin 7 (cathode)
of V-9 and terminal strip with r.f. choke L-13,
part no. 705002.
k.
2) Inserted C-17 (1500 mmf.) between pin 7 of
V-8 and chassis.
CODE MARKING — TRIANGLE 4W : Same
as for code markin Triangle 4>, but includes im
proved mechanical focus and centerin usin
“wobble plate/’ and'followin revisions:
1) Removed end of R-26 (3.9K) connected to
chassis; rewired to B+ 125-volt point.
2) Transposed erid 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 under code markin s ri
angle 4, Triangle 4A, and Triangle 4W.
CODE MARKING — TRIANGLE 4N or 5N :
Same as for code markin s Triangle 4 or Trian
gle 5, but with different horizontal output trans
former T-9, part no. 738026, replacin part no.
738038, and followin chan e:
1) R-102 (10K) wired to B+ 180-volt point.
CODE MARKING — QP: Chassis 120113B,
used in Models 644 and 647, may use a type 12-
QP4 in place of the type 12LP4 kinescope. The
letters QP stamped next to the trian ular code
markin denote the use of this tube. The compo-
nens used in such receivers will differ to the ex
tent indicated below:
SYMBOL PART PART NO.
12LP4 12QP4
L-10 Focus coil 708025 708033
L-8, L-9 Deflection yoke 708130 or
708130R 708036
V-25 Kinescope 810003 810017
-------
Anode cap 440011 470490
1-1 Ion trap 708086
(Double) 708085
(Sin le)
C-36, C-49 Filter condenser*
(Electrolytic) 925162 925165
* C-81 Condenser
(.05 mfd.) 923062 Not used
*Note that the markings on filter condenser C-36, C-49, part no.
925165 differ from those used on part no. 925162, shown in the
schematic diagram.
Circuit changes include the following:
1. C-81 (.05 mfd.) disconnected from hor. size coil L-6.
2. C-63 (.0005 mfd.) returned to pin 5 of V-19, instead of B— .
HIGH VOtfAGE
RECTIFIER
V 18
1B3 6T/0OI6
955298
HO RIt. 0AMPER
1500
---
20 Fig. 5-12— High Volt ge Power Supply— Ch ssis 120113B
Scanned by mbear2k - Jan 20121/17