Emerson Keystone Figure 637, Service Manual

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Fig. 4— Automatic Tuner— Part No, 470605
6. PICTURE TEAR
Code markings, Triangle 8, on B series chassis, and Triangle 1 on C series chassis refer to the same circuit modifications to
eliminate picture tear. These markings include all previous revisions, plus the following circuit changes:
a. Removed R-27 (33K, 1 watt).
b. Connected pin 6 of V-5 (screen) directly to B + (output side of filter choke connected to C-41, 40 mfd.,
marked 0 K
> **•-
c. Replaced R-25 (220K) with 1 megohm,' ^2 wa*t resistor/
d. Removed lead between pin 4 of V-10 (screen) and ju n c ti^ ^ o f L-13, C-31, C-36, and low end of R-46 (Vol.
control). ^
*
e. Disconnected L-13 from junction point (L-13, C-31, etc.) md rewired to pin 4 of V-10.
f. Added jumper wire between junction point /L-13, C-31, etc.) and pin 7 of V-9 (cathode).
7. PARTS LIST
The parts list included in this addendum note tabulates those components whose values have been changed as a result of
the foregoing modifications, plus new components added to the original circuit.
SYM BOL
|n
PAR T N o. DESCRIPTION
SYM BOL PART N o. DESCRIPTION
C-32
928006 1500 mmf., 400v
R-94 340972 100,000 ohm, ± 1 0 %
* C-37
923088
.002 mf., 600v
R-95
390132 100,000 ohm, Vert. Hold control
C-68
923088 .002 mf., 600v
R-96 340872 39,000 ohm, 1 / 2wi ± 1 0 %
C-69
923079 .001 mf., 600v
R-97 340572 2,200 ohm, *^w, ± 1 0 %
C-70
923079
.001 mf., 600v
R-98
331392
5.6 megohn, ^ w , ± 1 0 %
C-71
922014 .1 mf., 200v
R-99 390138 3 megohm, Vert. Size control
• C-72
922024 .033 mf., 600v
R-100 390135 3,000 ohm, Vert. Lin. control
C-73
910027
.001 mf., mica, 500v
R-101 370612
3,300 ohm, lw, ± 1 0 %
C-74
Pt. of C-21 100 mf., elect., lOOv
R-102 370612
3,300 ohm, lw, ± 1 0 %
R-7
340732 10,000 ohm, y2w, ± 1 0 %
R-103 340012 10 ohm, ^ w , ± 1 0 %
R-25
3412121 1 megohm, ^ w , ± 1 0 %
T - l l 738029
Vert, output trans.
R-50 340272 120 ohm, ^ w , -h 10%
Tuner 470605 Tuner ass’y.— Automatic
R-90
340732 10,000 ohm, *^w, ± 1 0 %
For best results replacements should be made with genuine Emerson parts and genuine, Emerson tubes.
F O R R E P L A C E M E N T PARTS — SEE Y O U R N E A R EST E M E R S O N D ISTRIBU TO R O R W R IT E D IR EC T LY T O
EMERSON R A D IO & PHONOGRAPH CORPORATION
111 E IG H T H A V E N U E N E W Y O R K 11, N. Y.. U. S. A.
Television
ft*
Scanned by mbear2k - Jan 20121/17