Sony KPR-41EXR95 Service Manual page 60

1 . Receive all-white signal. Maximize PICTURE and
BRIGHTNESS.
2 . Remove R902 from the N board. Connect a variable
resistor of 50kR on each end, and minimize
resistance.
3 . Remove R900 and R901 from the N board. Connect
a variable resistor of 50kR
minimize the resistance.
4 . Connect a digital voltmeter between the D801
cathode and chassis ground of the N board.
5 .
Turn on the power switch. Adjust the variable
resistors connected to the R902 of the N board to
make the digital multimeter to read 145.OVDC.
6 . Adjust the variable resistors connected to R900 and
down circuit and turn off the display.
7 . Read the variable resistors connected to R900 and
and mount fixed resistors of measured
resistance to the terminals.
Note : Select fxed resistance from the following
ranges.
8 . Maximize
resistance
connected to R902 of the N board and turn on
power.
9 . Vary variable resistance at R902. Confirm that the
HV hold down circuit is activated and the display is
turned off when voltage reads 134+1.OV.
N Board
q
R901)1
the
on each end, and
of the variable resistor
1 . Receive all-white signal. Maximize PICTURE and
BRIGHTNESS.
2 .
Connect a variable resistor of 50kS2 on each end of
of the N board. Maximize resistance.
3 . Connect a digital voltmeter between the D801
cathode and the chassis of the N board.
4 . Turn on power. Adjust the variable resistor so that
the digital multimeter reads 135.OV+
5 . Read the variable resistance then.
6 . Mount a fixed resistor of the measured resistance to
R902.
Note : R902 : Must be 2.2kQ to 16kR
7 . Turn on power again. Confirm that the digital
multimeter reads 135.OV-e
N Board
digital multi-mater