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VERT. LIN.
HEIGHT
VERT. CENT.
HORIZ. LIN.
HORIZ. LOCK
HORIZ, DRIVE
HORIZ. FREO.
CABINET-REAR VIEW
HORIZONTAL OSCILLATOR AND LINEARITY ADJUSTMENTS
HORIZONTAL OSCILLATOR ALIGNMENT CHECK:
Tune In test pattern and turn horizontal hold control
to extreme counter-clockwise position. Picture should re-
main In synchronization. Turn channel switch to another
channel and then back to the original channel. Normally,
the picture should be out of synchronization. Turn the
control clockwise and the picture should slowly begin to
synchronize and finally lock-In, This should occur when
the control Is approximately 90" from the extreme counter-
clockwise position. The picture should remain In synchro-
nization for another 90' In the clockwise direction of
the control. At the extreme clockwise position the picture
should again drop out of synchronization and 3i to 4i
bars should be seen sloping downard to the right. If the
receiver falls to hold synchronization during this check
with the hold control at the extreme counter-clockwise
position or falls to hold.synchronization for at least
60* In the clockwise direction from the point when It
drops Into "sync" It will be necessary to align the hori-
zontal oscillator circuit as follows:
(A) HORIZONTAL OSCILLATOR ALIGNMENT:
Turn horizontal hold control to extreme clockwise
position. Tune in test pattern and adjust trimmer Bl until
picture is out of sync, and shown 3£ to 4i bars sloping
downward to the right. If the trimmer has Insufficient
range, set it to its mid-position (one turn from tight)
and adjust slug B2 until bars appear.
(B) HORIZONTAL LOCKING ALIGNMENT:
Turn the horizontal hold control to full counter-clock-
wise position. Switch to another channel and back to the
original again.
Slowly turn horizontal hold control clockwise and note
the least number of diagonal bars present Just before pic-
ture syncs. If more than 4i bars are present Just before
picture sync, adjust "horizontal lock" trimmer B3 slightly
clockwise. If less than 3i bars are present adjust B3 slight-
ly counter-clockwise and switch channel selector to another
channel and back again. Recount bars present at the "lock-
In" point. Repeat this procedure until 3i to 4£ bars are
present.
Repeat Steps (A) & (B) until conditions exist as out-
lined under "Horizontal Oscillator Alignment Check".
WIDTH, DRIVE & HORIZONTAL LINEARITY ADJUSTMENTS:
Turn width control B4 to maximum clockwise position.
Adjust "horizontal drive" trimmer B5 for maximum brightness
and linearity. Adjust horizontal linearity B6 for best
linearity In the right half of the picture. Readjust width
control until picture fills the mask.
HEIGHT & VERTICAL LINEARITY ADJUSTMENTS:
Adjust the height control until picture fills mask
vertically. Adjust the vertical linearity control until the
test pattern is symmetrical from top to bottom.
Due to IntractioB between thes« two controls it Is nec-
essary to repeat the adjustment. Adjust the vertical cen-
tering control to align the picture with the mask.
PAGE 24
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