1-26 (No.YA068)
4.10 ADJUSTMENT PROCEDURE
4.10.1 CHECK ITEM
Item
Measuring
instrument
Test points Adjustment part Description
HIGH
VOLTAGE
check
HV voltmeter CRT anode SCREEN VR
[in FBT]
(1) Receive a whole black signal.
(2) Connect the HV voltmeter to the CRT anode and
check it as 25.0kV±1.3kV.
HIGH
VOLTAGE
HOLD DOWN
check
HV voltmeter
Resistor
(57.7k
Ω
, ±289
Ω
)
S1 3-pin:
X-RAY1
S1 4-pin:
X-RAY2
[SUB DEF.PWB]
• After repairing the high voltage hold down circuit, this
circuit shall be checked to operate correctly.
(1) Receive a whole black signal.
(2) Turn the power switch on.
(3) Refer to the figure, connect the resistor between S1
connector 3-pin and 4-pin.
(4) Make sure that the screen picture disappears.
(5) Disconnect the power plug.
(6) Remove the resistor.
(7) Again connect the power plug.
(8) Turn the power switch to on.
(9) Make sure that the normal picture is displayed on the
screen.
CONNECTOR
NCNC
NC
FBT
57.7k 289
3 2 1564
RESISTER
S1
Q ± Q
D
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