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WHITEBALANCE ADJUSTMENT
The purpose of this procedure is to optimize the picture
tube to obtain good black and white picture at all brightness
levels while at the same time achieving maximum usable
brightness. Normal RF AGC setting and purity adjustments
must procede this procedure.
This adjustment is to be made only after a warm-up
operation is provided for 5 minutes at least.
With antenna connected to the receiver, tune in picture
on a strong channel.
Rotate the Colour control (R839) to maximum CCW
position and misadjust pre-set Tuning so that the receiver
will not produce a color picture while the following
adjustments are being performed.
controls to mid-position.
end of its rotation range. Then, rotate it CW until a
dim raster of one pronounced color (Red, Green or
Blue) is obtained.
until a dim white raster is obtained.
formity on the picture tube screen.
raster is obtained.
obtain best white uniformity on the screen.
Black and white tracking procedure must have been com-
pleted before attempting this adjustment.
Operate receiver for at least 15 minutes and with antenna
connected to the receiver, tune in picture on a strong
channel.
probe to TP602, on PWB-B.
of 1.15v.
PURITYADJUSTMENT
Before purity adjustment can be made, the receiver
should be demagnetized and allow to run with full bright-
ness (without bloom) for a minimum of 10 minutes and
static convergence must be correct.
controls counterclockwise to get green alone.
back as much as possible.
green band is produced and that red and blue bands are
made at the right and left.
tightening up the clamp screw when the best over-all
green is obtained in the screen.
and then the R-Bias control clockwise. Check if the
purity of red has been achieved. After that, check
the purity of blue as well.
and negative
CONVERGENCEADJUSTMENT
Any colour impurity induced as a result of relocation of
the receiver normally will be removed by the Automatic
the receiver is turned on, after being off for at least 5
minutes.
The receiver, with the Brightness and Contrast controls
in normal position, should be operated for minimum of
purity, vertical size and vertical linearity must be made,
as directed in this manual, before attempting convergence
adjustment.
Connect the cross hach pattern Generator to the VHF
antenna terminals of the receiver and turn the receiver to a
channel suitable for operation with the particular generator
being used.
4
H-SIZE COIL
PURITY MAGNET
Figure 2.
The degaussing recurs any time
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