KV-34XBR800 (serv.man2) - Sony TV Service Manual (repair manual). Page 14

11.  LLMB (Left Lower Middle BOW)

B R

12.  CADJ Fix 29

Confi rm neck assembly Z axis position. (See Figure 1)

1.  Input a dot signal.

2.  Set Video Mode to STANDARD.

3.  Adjust focus VR clockwise (DE-Focus) to confi rm that the dot’s shape 

is centered. (Figure 2 & 3) Confi rm neck assembly rotation by W Board 
position. W Board should be level ±1º. Adjust as necessary to balance 
dot shape along center horizontal line, then refocus.

4.  Input a HD monoscope signal.

5.  Confi rm center focus with focus VR.

Figure 1

FOCUS

Screen (G2)

DOT SHAPE:

NOTE: Changing neck assembly position will affect corner convergence.

Figure 2

Figure 3

Normally, no adjustments are necessary for these systems. If for some 
reason the data is lost, use the following data:

Write the data from any non-vertically compressed mode, then use 
the CPY1 function (CXA2170D-4 Item 6) to copy the data to the 
vertical compressed modes. V-compressed data is identical to non-v-
compressed data. Service personnel with a trained eye can adjust the 
DF or DQP registers to adjust DF phase (Item 7) or DQP phase (Item 8), 
respectively, to balance left and right focus. Refrain from adjusting more 
than 5 steps from table data below. Further adjustment indicates a circuit 
problem -- troubleshoot to cause. Be sure that Neck Assembly is in the 
proper location