Originally Posted by Mik James
So how bad does convergence need to be before you need to adjust it with magnets rather than menu adjustments?
Rather than guess, I look a look at the Sony service manual for my XBR910.
The adjustments in blue
are performed using the service menu
"The following adjustments should be made when a complete realignment is required or a new picture tube is installed.
. BEAM LANDING
. V-PIN AND V-CEN ADJUSTMENT
. . VERTICAL AND HORIZONTAL STATIC
. . OPERATION OF BMC (HEXAPOLE) MAGNET
. . TLH PLATE ADJUSTMENT
. . DYNAMIC CONVERGENCE ADJUSTMENTS (Only H-component can be corrected, for vertical component use permalloy to compensate)
. SCREEN-CORNER CONVERGENCE
. FOCUS ADJUSTMENT
. SCREEN (G2)
. PICTURE QUALITY ADJUSTMENTS
. WHITE BALANCE (CRT) AND SUB-BRIGHT ADJUSTMENT
. H RASTER CENTER ADJUSTMENT
. PICTURE DISTORTION ADJUSTMENTS
The key item is that only horizontal convergence can be adjusted through the service menu (on these Sonys).
A vertical correction would have to be done using magnets.
I would expect a "calibration" to go through all of these adjustment steps.
I find it interesting that convergence is adjusted before distortion (i.e. geometry). On front projectors mechanical and static & dynamic electrical adjustments for geometry (aka alignment) are done first on the green CRT, then the red and blue are converged.
RegardsEdited by blue_z - 7/25/13 at 6:24pm