A
PPENDIX
A, C
HIPPER
C
HECK
36
PRELIMINAR
Y
**TRANSFER NEW ALIGNMENTS TO EEPROM**
There are two separate files downloaded to the SSB during the SSB Download operation; the
geometry and convergence data. The Geometry files are uploaded from the main EEPROM to the
current mode RAM immediately when the instrument is turned on. However the ITC222 uses the
convergence values from the current mode EEPROM, not the default. The uploaded convergence
files remain in the default convergence EEPROM until manually moved. So the new default file
values now need to be placed in the current mode EEPROMs for use. Otherwise the current mode
EEPROM’s still have the previous values, not the newly downloaded ones. The following
instructions take the default EEPROM values and transfer them to each of the current mode
EEPROM’s and RAM for immediate use.
1. After the instrument has been powered down for >30 seconds, reapply AC power and wait for
it to reach standby operation.
2. With the chassis in standby mode, enter the service menu by pressing and holding “<VOL DN>
and <CH DN>” for 8 seconds.
3. Using the remote control or FPA, select <Convergence>, <Defaults>, and place a check mark in
<Default Red/Green/Blue>. Select <Return> to return to the previous menu.
4. Now select <Store> and place a checkmark in <Store Defaults>. This places the stored settings
from the EEPROM transfer into the current mode EEPROM.
5. Select sensor calibration by placing a check mark in <Sensor Calibration> to set up autoconvergence.
NOTE:
If <Sensor Calibration> returns a red screen, autoconvergence will never be successful.
The first portion of autoconvergence is actually the same sensor calibration routine that runs here.
One or more geometry alignments may be too far off for the routine to properly locate the screen
sensors. Refer to service data and the “Geometry” section of this manual for geometry alignments.
It is suggested to first perform any minor tweaks that are noticeable onscreen using the geometry
alignment instructions. If only minor tweaks are required it may be possible to do them, then run
Sensor Calibration again. If geometry is adjusted too much, sensor calibration may be successful
however convergence may be disturbed enough to require touchups. Only after successful Sensor
Calibration will autoconvergence run. However it is possible for Sensor Calibration to be successful,
yet autoconvergence fails.
Once Sensor Calibration is successful, if convergence requires adjustment always use Level 3!
Also be aware there are always electrical differences between SSB modules. Even though the same DAC
settings have been transferred it may still be necessary to do some “fine tuning” to convergence and
possibly geometry.