Re-Adjustment ･････････････････18 - Hitachi CMP4121HDE Service Manual

8. Re-Adjustment
Ａｆｔｅｒ changing the Panel Module, re-adjustment is needed according to the item 8.1.to 8.5.
For Power Unit, item 8.1; for Signal Board, item 8.2 to 8.5* and for Video Board, item 8.2,
8.4,8.5 are needed.
It is recommended to start re-adjustment after 30 minutes warm-up with the Burn-in signal.
*) When it is not inserted into VIDEO Unit of optional Board in Signal Board replacement,
VIDEO Unit becomes necessary. In this case, insert the dummies' VIDEO unit and execute the above
adjustment item.
How to set to Burn-in signal
(red, green, blue, white, yellow, cyan, magenta, black signal)
Turn off the sub power button (or power button on the Remote Controller), then turn on the
SUB POWER button for more than 5 seconds while you keep pushing VOLUME▼ and
RECALL buttons located on the bottom of the set.
When you fall out from Burn-in mode, turn off the sub power button (or power button on the
Remote Controller),then turn on the SUB POWER button for more than 5 seconds while you
Keep pushing VOLUME▼ button located on the bottom of the set.
8.1 Vs and Va voltage adjustment on Power Unit
How to prepare
1.Connect the DC Voltmeter to the Vs test point and
the GND point (or the Va test point and the GND point)
on the Power Unit.
2.Connect VGA (75), no-setup, and all black signal to
RGB input terminal.
3.Check the amount of Vs and Va voltages printed on the
label located lower left side on the Panel Module.
How to adjust
1.If the difference of the printed voltage of Vs and the
value of DC Voltmeter of Vs is over ±0. 4 V, adjust
the Vs ADJ Volume located upward on the Power Unit
to within ±0. 4 V.
2. If the difference of the printed voltage of Va and the
value of DC Voltmeter of Va is over ±0. 4 V, adjust
the Va ADJ Volume located upward on the Power Unit to within ±0. 4 V.
Power Unit
Y-sus
Label
18
PIN502 GND
PIN501 Vs
VR51Vs ADJ.(IC591)
PIN301 Va
VR51 Va ADJ.(IC391)
Power
X-sus
Unit
Panel Module
Rear View