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HORIZONTAL
TH=1100Td
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96Td
1
I
22Td
VIDEO
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THR=960Td
VERTICAL
TVR=540TH
VIDEO
3. High Voltage Shut
Down
Circuit
Test
(1)
Switch off
the
main power switch.
22Td
(2) Apply
12V
DC of a DC power
source to
the base
of
Q521 (A-P.C. Board).
(3) Switch on the
main power
switch.
(4)
Make sure
that
the set shuts down.
(5) Switch off the
main
power
switch.
(6) Stop applying
12v
DC of the pc power source to the
base of 0521.
(7) Switch on the main power switch.
{8) Make sure
that the
set
operates properly.
4. Over Beam Current Protective Circuit Test
and
EHT
Decrease
Circuit
Test
(1) Input the 15.734kHz reverse cross
hatch
pattern signal
to LINE A.
15.734kHz
timing
chart
fd=::
13.500MHz
lh=15.
734kHZ
fv=59.825Hz (lntertaced scanning)
HORIZONTAL
TH:858Td
I
I
59Td
1
I
16Td
VIDEO
I
I
I
I
THR:720Td
VERTICAL
TVR=241TH
63Td
LJ
VIDEO
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(2) Switch on the main
power
switch
and
set
the
CONTRAST and BRIGHTNESS controls to MAX.
(3) Turn the scr.een VR (on
FBT)
counterclockwise fully
and
switch
off
the main power
switch.
(4) Short between
TPPS·
and TPP9
with a
jumper
wire
and
connect
a
digital voltmeter between TPD1
•+•
and
TPD2 "-".
(5)
Switch
on
the
main power switch.
(6) Turn the screen VR clockwise slowly until the set shuts
down and make sure that
the
reading of
the
digital
voltmeter
is fess
than
36V
at that
time.
(7}
Switch
off the main
power
switch.
(8) Input
the
60.00kHz
reverse
cross
hatch
pattern signal
to LINE A.
60.00kHz timing chart
fd=39.84MHz fh=60.00kHZ
fv=74.442Hz
(Non-interlaced
scanning)
HORIZONTAL
TH=:664Td
I
I
72Td
I
112Td
68Td
VIDEO
I
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THR=512Td
HD_j
LJ
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LJ
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(9)
Connect a
high-voltage meter to the
anode
of the
picture
tube.
(10)
Short between the both ends of R871
(C-P.C.
Board)
with a jumper wire
and
tum the screen VR (on FBT}
counter-clockwise
fully.
(11} Switch
on
the
main
power
switch.
(12)
Short between
TPB12
and GND with a jumper wire.
(13}
Turn
the screen VR
(on
FBT) clockwise until the
reading
of the digital voltmeter is
60V.
(14)
Make
sure
that
the
reading of the high-vol.tage
meter
is
less
than
30kV.
(15) Turn the screen VR (on
F'BT)
counterclockwise fully
and
remove the jumper wire
between
TPB12
and
GND.
(16)
Switch off the main power switch.
(17} Remove the other jumper wires
and
the
digital
voltmeter.
-
5
-
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