ation. The
strength of the signal being received and your personal preference for
picture detail will determine the optimum setting.

SERVICE

Your new Zenith television receiver is engineered for dependable long
life service but like any mechanical or electrical instrument, it will
occasionally require maintenance. For service consult your Zenith dealer
or refer to the organization that installed your instrument. (See
warranty.)

Picture Adjustments

BRIGHTNESS

Rotate clockwise to increase the brightness; counterclockwise reduces
the brightness. It is to be used in conjunction with the contrast
control since its movement will also have an effect on picture contrast.

[Illustration: FIG. 2]

=NOTE:= The brightness control setting for the picture shown in Figure 2
is set too high. Set the control below this level.

CONTRAST

Adjust the picture for best distinction between the black and white
shading. Your own vision is the best judge in setting this control
properly.

[Illustration: FIG. 3]

=NOTE:= The contrast control setting for the picture shown in Figure 3 is
set too high. Set the control below this level.

HORIZONTAL HOLD CONTROL

If the picture appears to have a tendency to move across the screen, or
if it assumes a broken streaked appearance, as indicated in Figure 4, it
should be readjusted to a point where the pictures remain locked in
properly on all channels.

[Illustration: FIG. 4]

VERTICAL HOLD CONTROL

This control is used in correcting for vertical movement, or rolling up
or down. Set control to lock picture. (Fig. 5)

[Illustration: FIG. 5]

Interference

The most effective means of reducing interference to a minimum has been
built into your Zenith Television receiver. Occasionally however, the
picture may be affected by electrical interference or reflections.

AUTO IGNITION AND APPLIANCES

Automobile ignition, electrical appliances, etc., cause a speckled
streaked appearing picture as shown. This condition is most noticeable
in weak signal areas. (Fig. 6.)

[Illustration: FIG. 6]

DIATHERMY

Diathermy produces a distinctive herringbone pattern and one or two
horizontal bands across the face of the picture. (Fig. 7). It can
sometimes be reduced or eliminated by the insertion of a filter trap at
the antenna terminals.

[Illustration: FIG. 7]

R.F. INTERFERENCE

Radio signals by a neighboring commercial, amateur or police station may