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SAFETY PRECAUTIONS
.
,.
~
An isolation
transformer
should
be connected
in the power
line
between the receiver and the
AC
line before
any
I ______
.__—–-—. -— .—_
' service
is performed on the receiver.
Qi
INSTALLATION AND SERVICE ADJUSTMENTS
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—..-——
1
I
~A~N~E~T~The
primaq
source of X-RADIATION in television
receiver is the picture tube. The picture tube is spe-
j clally constructed
to limit X-RADIATION emissions.
For continued
X-RADIATION protection,
the replacement
tube must be the
~ same type as the original
including
suffix letter. Excessivehigh voltage may produce potentially hazardous X-RADIATION, To
avoid such hazards, the high voltage must be maintained
within specified limit. Refer to this service manual, high voltage adjust-
ment for specific high voltage limits. If high voltage exceeds specified
limits, take necessary corrective
action. Carefully follow
_ ~ the instructions
for + B1 volt power supply adjustment,
and high voltage adjustment
to maintain the high voltage within the speci.
fied limits.
Y
.-
COLOUR ADJUSTMENT (PAL)
Receive colour bar pattern. (See Fig. 1)
Set's controls:
brightness
............. maximum
color . ................... maximum
ADJUST
REMARKS
Connect the oscilloscope to TP-13B ( + ) and TP-13E ( – ) on
the AIV unit.
1
VR251 ,~81
Adjust VR251, T281 to obtain each lH
waveform (amplitude) for same as
shown below.
uIH+–lH+
m .
. . . . . . . . . .
. . . . . . .
!
+%
J
_
-'J
iJ
fi
b
B-Y WAVEFORM
Figure 3
2
T211
Adjust T211 to obtain proper waveform
as shown in Figure 3
GREY SCALE AND TRACKING ADJUSTMENT
Tune the receiver to the mono-chrome circular pattern.
1.
2.
3.
4.
5.
6.
7.
8.
9.
Set the BRIGHTNESS
and the COLOUR to normal, the
CONTRAST to maximum.
Set the SERVICE SWITCH (SW241) on the Main unit to the
service side znd disconnect K13BL on the AN unit.
Set the DRIVE VOLUME
(VR681 and VR661) at their
mechanical center.
Set the BIAS VOLUME (VR662, VR672 and VR682) to mini-
mum. (fully counter clockwise.)
Turn the SCREEN VOLUME on the Main unit to obtain just
visible one coloured line.
Adjust each BIAS VOLUME (VR662 — BLUE, VR672 —
GREEN and VR662 — RED) alternately untill a dim white line
produced.
Set the SERVICE SWITCH (SW241) to the normal side and
connect K13BL.
Adjust the DRIVE VOLUME (VR661 — BLUE and VR661 —
RED) alternately to produce normal black and white picture.
Check for proper grey scale traking at all brightness levels.
N~E:
If grey scale adjustment
is made after picture tube
replacement, check high voltage and sub — brightness
adjustments.
FOCUS ADJUSTMENT
Adjust focus control on the left side of the chassis for well scan-
ning lines.
SUB CONTRAST ADJUSTMENT
1. Connect the oscilloscope to TP-6C ( + ) and TP-6E ( – ) on the
CRT unit.
2. Set the Colour to minimum and the contrast to maximum.
3 Adjust brightness VR or Sub — brightness VR (VR211) to be
"b" - Iov & 5V.
4. Adjust VR1202 (Sub — contrast volume) on the Video unit to
be "a" = loovf~.
.
b
T
a
–2–
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