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28. Auto Registration Troubleshooting
verified with a calibrated external source, the internal crosshatch can be centered by changing and saving the
value of “TPHP” and “TPVP” at the beginning of the PJE group.
When replacing an A board in most models, the NVM for the main CPU will be flashed with default data. This is
general service data. The convergence data will be located on one or more dedicated NVM chips. In most
cases, the new board can be installed with the default settings. Some minor adjustments will be necessary for
vertical and horizontal size and centering along with pincushion. Do not attempt to correct these global settings
in the convergence mode. Edge distortions will occur and high data values will cause excessive drive to the
convergence output ICs, causing them to run hotter. When an attempt is made to write the new settings to the
sensor data, Flash Focus
TM
errors are likely to occur.
Once the coarse alignments are completed, the data must be saved by pressing “MUTE” followed by “ENTER”
on the remote. It is recommended to write the sensor offset data by pressing Flash Focus
TM
before performing
fine adjustments. The flash focus sensors are only able to distinguish skew, centering and size on the center of
each screen edge and cannot detect or correct isolated areas of the screen. It is common to complete a near-
perfect convergence session only to see small areas knocked out of convergence after the flash focus memory-
write. Be sure to press “mute” followed by “enter” before engaging the flash focus or your alignment job will
revert to where you began. Once the course alignment has been written to the offset data, fine adjustments can
be performed, the data saved and the service mode exited.
TIP: The first item to appear in the PJE adjustment group is “FDIS”. Changing this value from 0 to 1 will display
the horizontal and vertical data values on the screen for the fine cursor. This is useful in determining if you are
reaching the end of the data range for a particular cursor position and this is common to occur in the corners. It
is also valuable when adjusting geometry with the fine cursor when only green is being displayed since the
cursor cannot change to white when the joystick is pressed for movement of the cursor.
CRT Replacement
: When replacing a CRT it is very important to properly align the main deflection yoke rotation.
Failure to do so is a common cause of errors when writing sensor data. With the new CRT installed and the yoke
roughly positioned, press, “7” followed by “enter”. The data in the convergence CPU registers will zero out and
the convergence will be severely misaligned. Now that any potential skew correction has been removed, the
yoke can be rotated to place the particular color as close as possible to the proper point where minimal skew
correction is needed by the convergence circuits. Do not be concerned with centering at this time. Align the new
color as parallel as possible to the other two. Some of the RA-5A and RA-6 chassis contain centering magnets
on the CRT and this is the time to adjust them if necessary. The RA-3 and RA-4 series did not come with
centering magnets. If the above steps are followed, minimum alignment will be necessary.
WARNING: Do not save any data while in the “initialize” mode. Pressing “0” – “enter” will read the NVM data
back to the CPU registers and restore the picture. Some technicians (and customers) believe that “initialize”
restores factory default data settings. All data, including the fine cursor, is zeroed out. The fine cursor alignments
play a significant role in vertical linearity and pincushion adjustments. Those who have had to change a defective
NVM IC in the convergence circuits can tell you how long it takes to re-align the convergence when this happens.
Even if all data values for the coarse and fine adjustments and each color were available, it would still take over
an hour to enter the values.
High Definition Televisions
: With the introduction of high definition and “high definition ready” models, additional
steps were introduced in the convergence adjustments. Since these models are required to display several
format resolutions and aspect ratios, raster size needs to be changed to provide the most appealing picture for
the customer. This is adjustable by the customer unless a true HD source is being received in which all control
is relinquished to the incoming signal. Due to the raster size changes (and scan frequency in some models),
convergence adjustments must be made in several modes. The data must be saved and the Flash Focus
TM
offset data written for each mode. The redundant procedures require additional time for a routine procedure.
Convergence is adjusted in the FULL mode, followed by the same procedures in the WIDE ZOOM, ZOOM and
1080i modes and must be performed in that order. A 1080i sync source is required for the last mode. The
NORMAL mode does not need to be adjusted. It is the same as the FULL mode with gray borders
