Hitachi 46W500 Training page 91

DP-3X CHASSIS READ FROM ROM NOTES
BEFORE MAKING ANY DIGITAL
CONVERGENCE ADJUSTMENTS
Heat Run the set for at least 20 minutes.
Do not run Magic Focus before the 20 min-
utes have passed.
MAKE A
DETERMINATION:
1) There are many situations where the digi-
tal convergence looks as thought it may
need a convergence adjustment.
2) Be sure that it really does before begin-
ning.
3) READ FROM OLD ROM DATA:
4) In any Hitachi Digital convergence set, the
Old ROM data can be re-read to place the
unit into the last saved condition. This
could be beneficial before an attempt to
make a rather lengthily adjustment.
5) Enter the DCAM.
Press the Service Only switch on the De-
•
flection PWB.
6) To Read the Old ROM Data, press the
SWAP button twice.
First press: (Read from ROM?) will ap-
•
pear on screen.
Second press: Screen goes black, then re-
•
appears with green dots.
Press the MUTE button to return to Digi-
•
tal convergence grid.
EXAMPLE:
Sometimes the Magic Focus will not run cor-
rectly and will return an error code.
Sometimes after Magic Focus is run but the
convergence appears off after completion.
OTHER IMPORTANT INFO:
Many times after a complete adjustment,
when initializing the Magic Focus sensors, an
error code will appear, overflow, Error 4,
etc...
When this happens, most of the time it is be-
cause some critical adjustments were over-
looked or skipped.
The below adjustments are very critical to the
complete alignment process and CAN NOT
be overlooked.
Vertical Size Adjustment
•
Horizontal Size Adjustment
•
Red and Blue Offset Adjustment
•
DCU Character Adjustment and data
•
confirmation check
DCU Sensor Position Adjustment.
•
All of the above adjustment can vary depend-
ant upon the Chassis used. Be sure to check
the Service Manual for specifics related to
values.
2
In I C Bus adjustment: H. POSI Adjust-
•
ment
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