2-4. Focus Adjustment; 2-4.1. Dynamic Focus/Dynamic Quadra-Pole Data - Sony KD-30XS955 Service Manual

2-4. FOCUS ADJUSTMENT

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 counter clockwise (Over Focus) to confi rm the dot's
shape. Center should be very slightly oval with left and right sides
balanced.
4. Input a HD monoscope signal.
5. Confi rm center focus with focus VR.
KD-34XBR960/34XS955/36XS955
CRT: 36RDE/38RFN (Super-fi ne pitch and square fannel)
Neck Assy:NA328 (VA-type, square pin assignment, VPIN harness)
G3
G2
G1
Center Tolerance: + /- 0.5mm
G1 Cup Holder
KD-30XS955
CRT: 32RDE (Super-Fine Pitch and square fannel)
Neck Assy:NA2920 (VA-Type, Square pin assignment, VPIN harness)
G3
G2
Edge of G2 part
G1
Position tolerance: +/- 0.5mm
Over Focus
Focus
Screen (G2)
KD-30XS955/34XBR960/34XS955/36XS955
Neck-Assy: NA328
Neck-Assy: NA2920
Center Step
Figure 1
HVD
DQP Dot Pattern
Center Dot Slightly Oval
NOTE: Changing neck assembly position will affect corner convergence.
2-4.1. DYNAMIC FOCUS/DYNAMIC QUADRA-
POLE DATA
Normally, no adjustments are necessary for these systems. If for some
reason the data is lost, use the data from Table 1 below:
1. 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.
Note: 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.
CAUTION: Be sure that Neck Assembly is in the proper location.
Mark position before moving or replacing neck assembly.
(See Section 2-4 Figure 1 - before changing DF/DQP data or
troubleshooting circuit when DF/DQP is suspect.)
Procedure to adjust or check:
1. Short Q8018 B-Gnd to disable DF.
B Mark is on the circuit board. Circuit connection changes should
always be done with the power off.
CAUTION: Q8018 heatsink is live and peak voltage is 250V.
2. Input a cross hatch signal.
3. Change CXA2170-P2 item 2 RGBS to 2 to make green only.
1. Overfocus to adjust DQP phase. Adjust the data
(CXA2170-D4 item 8) to balance left and right vertical line width.
2. Once DQP is balanced, remove the short from DF circuit and
refocus the set.
3. Adjust DF (CXA2170-D4 item 7) to balance left and right vertical
line width.
4. Reconfi rm focus performance.
30
QPAM
QPAV
QPAP
QPDC
QPDV
QPDP
DF
DQP
KD-30XS955/34XBR960/34XS955/36XS955
Upper Corner
Center Horizontal Line
Lower Corner
34 36
33 45 22
46 47 40
6 6 6
29 42 17
59 63 52
6 6 6
40 36 36
38 37 37
Table 1
16