Degaussing With Handy-Demagnetizer; General Precautions; How To Hold And Use The Handy-Demagnetizer; Caution - NEC DPro2070SB Service Manual

2.8

Degaussing with handy-demagnetizer

2.8.1

General precautions

(1) Carry this procedure out with the monitor power ON.
(2) When degaussing with handy-demagnetizer, the demagnetizer power must be turned ON
and OFF at a position at least 1m away from CRT tube.
(3) Use a bar type demagnetizer instead of a ring type.
Carefully and slowly (1m/3 sec.) demagnetize the CRT tube and bezel side surface.
When separating the degaussing coil at the end, separate as slow as possible with the
following procedure.
If separated quickly, stripes could remain at the picture corners.
2.8.2

How to hold and use the handy-demagnetizer

(1) Approach the demagnetizer as carefully and slowly (approx. 1m/3 sec.) as possible, and
move around the bezel side periphery two to three times.
(2) Next, gradually (approx. 1m/3 sec.) move to the CRT tube side, and move around the CRT
tube four to five times with the following procedure.
(3) Finally, leave the CRT tube as slowly (approx. 1m/3 sec.) as possible, and turn the handy-
demagnetizer unit switch OFF at a position 1 to 1.5m away.
(NOTE): The monitor should be degaussed as whichever following conditions.
(1) Degauss by handy demagnetizer in off condition.
(2) Degauss by handy demagnetizer in power management condition.
(3) Degauss by handy demagnetizer with monitor set degauss operation.
Looking from side of set
<Holding the handy - demagnetizer>
Face the handy - demagnetizer
so that the longitudinal direction
is vertical in respect to the CRT.
2.9

Caution

Do not input the user timing before factory adjustments.
(The automatic tracking of the FOCUS could be adversely affected.)
1m or more
※Slowly (approx. 1m/3 sec.) pull away from center of tube.
Separate at least
2cm away from tube.
CRT
SW
ON / OFF
Do not hold the handy -
demagnetizer so that the
longitudinal direction is parallel in
respect to the CRT.
CRT
2 - 36