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SELF CHECK
Self check is used to automatically check the Bus lines and Hexadecimal code of the TV set.
To enter the Self Check mode press Function down button, on the Preset Panel, at the same time pressing the Status button, on the Remote
Control, and the screen will show:-
Adjustment Procedure
Item/Preparation
+B SET-UP
1.
Operate the TV set
2.
Set the controls:
Brightness
Contrast
RF AGC
1.
Receive a test pattern.
2.
Connect an oscilloscope between the
tuner RF AGC and ground.
3.
Set the oscilloscope gain range to
1V/div.
CUT OFF
1.
Receive a black and white signal.
2.
Degauss the tube externally.
3.
Set the TV into Service Mode .
4.
Select Ug2 Test.
minimum
minimum
1.
2.
1.
2.
3.
4.
5.
1.
Set the +B voltage up as follows:
Adjust P633 so that U147 shows 147V +/- 0.5V
2.
Confirm the following voltages.
U5
5
+1/-0.25V
U8
8
+/-
0.5V
U12
12
+/-
0.5V
U16
16.0 +/-
0.5/-1V
U25
24.8 +/-
1.0V
KU5 5
+/-
0.25
KU12 12
+/-
0.5V
KU28 29.5 +/-
2V
Check that the noise becomes large when the RF AGC VR
P4701 is turned counterclockwise. After the check turn it clockwise.
Gradually turn the RF AGC VR anti-clockwise, and set the
RF AGC VR to the point where the RF AGC voltage is just falling to a
point where this voltage drops by 0.2V from the maximum value.
Confirm which colour has the biggest value
Turn the screen VR P3368 to minimum.
Connect an oscilloscope to the cathode with the biggest value
colour.
Adjust P3368 to get a low light pulse voltage of 150V +/- 5V
(TX-25AD1DP 160V +/- 5V).
Adjust P3362 to whichever colour reaches 50 +/- 10 first.
Adjustments
U28
28 +/-
1.0V
U40
38.5 +1.5/-1.0V
U210
209 +/-
10V
U5SB
5.0 +/-
0.25V
UM
8
+/-
0.5
KU8
8
+/-
0.3
KU-12
-12+/-
0.5V
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