Safety Related Adjustment - Sony KV43TR27 Service Manual

CONFIRMATION) AND READJUSTMENTS
When replacing the following components (marked
with 0 on the schematic diagram) , always perform
the adjustment as follows :
R512, R521, R522, R555, R556, R567, R568, T503, DY
(1) Preparation before confirmation
1. Turn the POWER switch ON, and receive entire-
ly dot signals and set the PICTURE and BRIGBT-
NESS controls to minimum.
2. Confirm that voltage of T85 is more than 25.0f
V AC supply.
(2) Hold-down operation confirmation
1. Turn the POWER switch ON, and receive entire-
ly dot signals and set the PICTURE and BRIGIIT-
NESS controls to minimum.
2. Apply DC voltage to the check terminal of TP85
via lT40 from the DC stabilized power source.
Confirm that the minimum voltage is less than
hold-down circuit.
NOTE : when the hold-down circuit starts operating,
switch OFF the POWER of the set im-
mediately.
T503 ; -
F B T ;
I
SECTION 4

SAFETY RELATED ADJUSTMENT

TP85
(3) Hold-down readjustment
When step(2) is not satisfied, readjustment should
be performed by altering the resistance value of R
568 (a component marked with 6).
(4) Confirmation of hold-down errorneous operation
signals and set the PICTURE and BRIGBTNESS
controls to minimum.
2. Confirm that the hold-down circuit does not
operate by turning the POWER switch ON and
OFF repeatedly several times.
NOTE : If the hold-down circuit starts operating in
the above case, switch OFF the POWER of
the set immediately.
3. Turn the POWER switch ON, and receive dot
signals and entirely white signals, and set the
PICTURE and BRIGHTNESS controls to maxi-
mum.