Emerson Keystone Figure 637, Service Manual

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/ N E C H E L S E A 2 - 1 8 0 0 C A B L E A D D R E S S . E M P H O N O C O N E W Y O R K C O D E S
B E N T L E Y S A B C 5 T H " E D I T I O N I M P
‘Emerson
R A D I O A N D P H O N O G R A P H C O R P O R A T I O N
111 EIGHTH AVENUE
%
| NEW YORK CITY, 11
September 13, 19U9
TO ALL EMERSON DISTRIBUTORS:
In order to keep you advised of circuit changes in Emerson Television
Receivers, a simple code identifying system has been put into effect.
A triangle with a number inside it will be inked on the rear wall of
the chassis next to the AC power input.
Each time any change is made in production, the number within the
triangle will change and, automatically, a field service bulletin will
be issued to you so that you may keep up to date on all such circuit
changes.
It is also important that you keep a record of these changes and file
them properly for future reference.
This bulletin is the first in this new series and pertains to the Model
637 chassis model 110. Chassis bearing the code Triangle 1 have the
following revisions incorporated:
Circuit Revisions to Correct Picture FLICKER or BOUNCE
1 .
2
.
3.
U.
5.
6
.
Remove red lead from the B plus 125 volt point on terminal strip
near Uth I.F. and from Pin #6 of the 6AU6 (V-5)»
Remove red lead from the
of the 6AU6 (V-5).
terminal of C-U2 and from Pin #6
Insert a wire between the B plus 12$ volt point and the
of the C-U2 above.
terminal
Remove the U7,000 ohm resistor (R-28) from Pin #6AU6 (V-5) then wire it
to the
B
plus 125 point on terminal strip near the Uth I.F.
Remove the 33,000 ohm resistor (R-27) from the
B
plus 125 volt point
on terminal strip near V-12 and V-13 and from the junction of the blue
lead C-21 on terminal strip near 7-6 and V-15.
Wire the 33,000 ohm resistor (R-27) between Pin 6 of 6AU6 (V-5) and the
empty lug on terminal strip near the power transformer. Add a wire from
A G R E E M E N T S A N D S A L E S S U B J E C T T O S T R I K E S . A C C I D E N T S O R O T H E R C A U S E S B E Y O N D O U R C O N T R O L
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