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Figure 5-1— Deflection Yoke and Focus Coil Adjustments,
Combined Mechanical and Electrical Centering
a.
DEFLECTION Y O K E : If the raster lines are
m
not horizontal, loosen the center wingnut ( A l )
and rotate the yoke coil assembly to correct the
condition. Tighten the wingnut firmly.
The position of the assembly along the axis of the
kinescope is fixed by the two outer wingnuts (B l,
B2).
The yoke should be positioned approxi
mately at the center of the slots.
Figure 5-2— Focus Coil Adjustments, Mechanical Centering
b.
EM -PM FOCUS CO IL: For models not provid
ed with a " wobble plate," adjust the upper screw
m
(C l) of the focus coil to center the raster ver-
, tically.
Slight variation of the two side screws
(C2, C3) may be required to complete the adjust
ment.
The focus coil should not be positioned
too close to the deflection yoke as the range of
adjustment of the FOCUS control (R 55) will
be limited.
To center the raster for models provided with
a " wobble plate" and focus levers, proceed as fol
lows ( See figure 5-2):
1) Adjust the focus lever to make the focus coil
concentric with the neck of the kinescope.
Loosen the three mounting nuts (B l, B2, B3)
slightly, if required.
2) Loosen the single wobble-plate mounting screw
(A ) and slide the plate vertically or horizontal
ly, by means of the lever, to approximately cen
ter the raster. Tighten the mounting 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. Tighten the mounting nuts (B l,
B2, B3) after positioning.
4) Note that normally only the vernier adjust
ment (focus coil lever) is required, unless the
kinescope has been replaced.
plate lever has been initially positioned at the
factory and usually will not require readjust
ment.
c.
ION T R A P : 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.
controls, remove the cabinet back.
line-cord to complete the a-c. power connections, with
the back removed.
Before proceeding 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 setting the electrical controls.
the controls in the order indicated.
a.
A DJU STM EN T
(Table III).
STEP
C O N TR O L SYM BOL
1
Vertical
2
Vertical
Linearity
3
Horizontal
Drive
4
Horizontal
Linearity
5
Horizontal
6
Horizontal*
Centering
7
Focus
Scanned by mbear2k - Jan 20121/17
Emerson Radio
For access to the adjustment
Use an adapter
CO N TR O L
A D J U S T M E N T
R-96
Affects bottom section of
Size
raster and overall size. A d
just to fill the mask verti
cally
(height).
R-100
Affects top section of ras
ter and overall size.
for best linearity.
R-80
Controls signal to horizon
tal output V -19. Adjust for
best linearity.
L-7
Affects linearity of left and
center sections of raster. Ad
just
in
conjunction
R-80, for best linearity.
L-6
Adjust
to
Size
horizontally (width).
R-103
Adjust to center raster hor
izontally.
R-55
Controls current through fo
cus coil L-10.
sharpest line detail.
The wobble-
Adjust
S E T T IN G S :
Adjust
with
fill
the
mask
Adjust for
11
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