Parker KVP2425C05, Service Manual

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3
b) under ”M” condition, set the accelerator to an appropriate point for aging.
4.4 Accelerator adjustment
a) do not receive signals;
b) select “SC” of factory menu3 to let the field scanning stop working.
c) adjust acceleration potentiometer to let bright lines just appears on screen.
d) exit SC menu.
4.5 High voltage check
Note: the main power voltage (B+=135 V)can affect the high voltage directly, so be sure to let the B+
power voltage accurate. Under any state, the high voltage should not exceed 30 kV.
a) connect an accurate high voltage meter between the second anode cap of picture tube and
ground.
b) turn on TV and receive testing card signal.
c) set picture to standard, the high voltage should be 27 kV
±
1 kV.
d) the high voltage should not exceed 30KV with minimum brightness and contrast.
4.6 Focus adjustment
a) receive PHILIPS signal
b) adjust focus electrode potentiometer on FBT to optimize B area focus of screen.
4.7 White balance adjustment (color temperature 12000
°
K
±
8MPCD,X=0.270
±
0.008,Y=0.283
±
0.008)
a) receive full white signal
b) select factory menu3
c) on the basis of blue, adjustment RD,GD of M3, let to white balance coincide with standard.
4.8 Filed scanning adjustment (fig-2)
a) receive PAL of PHILIPS test pattern signal.
b) select factory menu1
c) adjust V-SLOPE menu to let the horizontal center line of test pattern above blanking.
d) select V-SHIFT menu and adjust to let the vertical center of picture coincide with
vertical center of picture tube.
e) Select V-SIZE menu and adjust to let the vertical reproduction ratio of picture acceptable.
f) Adjust V.SC to optimise the vertical S correction of picture.
g) Receive NTSC PHILIPS test pattern and readjust the above items.
Fig-2 field scan adjustment
4.9 Horizontal scanning adjustment (Fig-3)
a) Receive PAL PHILIPS signal
b) Select factory menu1
c) Select H.SHIFT menu and adjust to let the scanning horizontal center coincide with mechanical
center of picture tube
d) Exit M3 menu
e) Adjust VR433 to let horizontal reproduction ration of picture acceptable
f) Adjust VR432 to minimize left-right edge pincushion distortion of picture
Horizontal line
Under part banking