Hitachi P50H401/DW3, Руководство по обслуживанию

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BACK TO ADJUSTMENTS
4 POWER SUPPLY Vs, Va voltage adjustment
Item Power Unit Vs, Va Adjustment Adj. point Refer to following
Adjustment Preparations Adjustment Procedures Remarks
(1) Turn on the set and perform
pre-heat run more than 1 min
on burn-in screen.
(1) Turn Vs ADJ to adjust Vs voltage
to be within
r
0.1V of the value
specified in the label on the panel.
Permissive level of voltage in
sufficient time of heat-run
performed is:
Vs: within
r
0.1V
(2) Receive full black pattern signal
(or video silence signal; but the
power will be automatically turned
off after a few seconds by power
save function.)
(2) Turn Va ADJ to adjust Va voltage
to be within
r
0.2V of the value
specified in the label on the panel.
Va: within
r
0.2V
(3) Connect voltmeter (which has an
error within 0.02V or less) leads
to Vs (or Va) and GND test points
of the power unit.
(3) Reconfirm that Vs voltage remains
within
r
0.1V of the specified value.
Readjust if it’s outside of the margin .
[Label example] Label position (Reference)
: Upper left
If it’s hard to read the voltage
value because of the wiring
positions, write it down by a
marker at visible place in
advance.
<LOT>N6
Vs= 80.0V Va=60.0V
V
윘
=140.0V Vx=60.0V
DW 3 U
50”
̪
Never touch this VR !
(This is already adjusted.)
CN99
㧦
Vs/Va
Test pins
(1)pin: Va
(2)pin: Vs
(3)pin: GND
̪
Never touch this VR !
(This is already adjusted.)
̪
Never touch this VR !
(This is already adjusted.)
Vs1
㧦
Vs Coarse ADJ. VR
Vs2
㧦
Vs Fine ADJ. VR
Va1
㧦
Va Coarse ADJ. VR
Va1
㧦
Va Fine ADJ. VR