Focus Adjustment; 2-4.1. Dynamic Focus/Dynamic Quadra-Pole Data - Sony Trinitron KV-29DRC420 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.
KV-32/34/36 HS420
CRT: 34RSN/36RV2/38RSN (NON-super-fi ne pitch and round
fannel)
Neck Assy:NA328 (VA-type, square pin assignment, VPIN harness)
G3
G2
G1
Center T olerance: +/- 0.5mm
G1 Cu p Hol der
KV-27/30 HS420
CRT: 29RSN/32RVE (NON-Super-Fine Pitch)
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)
KV-27HS420/29DRC420/30HS420/32HS420/34HS420/36HS420
Neck-Ass y: NA3 28
Neck-Assy: NA2920
Center Step
Figure 1
HVD
KV-27HS420/29DRC420/30HS420/32HS420/34HS420/36HS420
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.
27 30W
QPAM 36
QPAV 44
QPAP 6
QPDC 22
QPDV 52
QPDP 6
DF 36
DQP 37
Upper Corner
Center Horizontal Line
Lower Corner
32 34W
33 25 45
46 40 47
6 6 6
29 17 42
59 52 63
6 6 6
40 36 36
38 37 37
Table 1
36
22
40
6
17
52
6
36
37
25