Emerson Keystone Figure 637, Service Manual

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Emerson Radio
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Figure 5-11— Deflection Circuit Waveforms
a. CODE M A R K IN G — E : Part No. 925162, C21,
C36, and C49; C49 (80 m fd.) is marked A, ^nd
C21 (10 mfd.) is marked O due to incorrect con­
denser marking, instead of markings shown on
schematic diagram:
b. CODE M A R K IN G — C: No Pyramid paper
tubular condensers used.
c. CODE M A R K IN G -T R IA N G L E 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 (6A C 6). Removed red lead from the
40 mfd. ( □ ) terminal of C-42 and from pin
6 of V-5 (6A U 6).
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 (6 A U 6 ); 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 (6A U 6) and the empty
lug 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
green 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 M A R K IN G — T R IA N G L E 1J : Includes
revisions covered by code marking Triangle 1, plus
changes to correct picture weave as detailed in
code marking Triangle 4.
e. CODE; M A R K IN G — T R IA N G L E 2 : Includes
revisions covered by code marking Triangle 2y plus
changes in vertical deflection circuit detailed un­
der code marking Triangle 4.
f. CODE M A R K IN G — T R IA N G L E 3: Same as
for code marking Triangle 2, but includes both
horizontal and vertical circuit revisions outlined
in code marking Triangle 4.
g. CODE M A R K IN G — T R IA N G L E 4 : Includes
revisions covered by code marking Triangle 1, plus
additional changes to eliminate picture weave, as
follows:
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Scanned by mbear2k - Jan 20121/17