Elekta CTR1498 Manuel - Page 7

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8. FOCUSING ADJUSTMENT
(a) Receive a TV signal.
(b) Set the contrast control to the normal position.
(c) Adjust the FOCUS control ( on· T302 ) for a well-defined, sharpest display on the screen.
9. WHITE BALANCE ADJUSTMENT
(a) Set TV brightness control to miniumum and switch to AV mode. Warm up the set for 15 minutes.
(b) Set the R.G.B. cut off controls VR403 VR404, VR405 and the B.G. drive control ( VR401, VR402 ) to center position.
(c) Rotate the screen control on the FBT fully counter clokwise.
(d) Disconnect the luminance output terminal connector ( socket-Y ).
(e) Connect TP9 and TP10 with a jumper wire.
(f)
Rotate the screen control gradually clockwise until the first horizontal line appears on the screen.
(g) It the first horizontal line is in blue, adjust VR403, VR404 to increase the red and green component level to get a white horizontal
líne.
(h) Remove the jumper wire and connect back the luminance output connector ( socket-Y ). Adjust VR401, VR402 to maintaina good
white balance at the brightest part of the screen.
(i)
Observe the screen white balance, if it is not proper ire high brightness or low brightness condition, adjust R.G.B. cut off controls or
G.B. drive controls respectively to maintain a good white balance in both low and high luminance.
10. DELAY AGC ADJUSTMENT
(a) Switch on the TV receiver, set input signal level at 60dB.
(b) Adjust the AGC control ( VR101 ) fully clockwise, then turn it counter clockwise until snow noise just disappears from me screen.
Now AGC voltage should be 6. 2V.
11. ABL ADJUSTMENT
(a) Tune in a color bar pattern signal.
(b) Set the brightness, contrast and color to minimum.
(c) Turn VR802 counter clockwise until two black-white burs just appear on the left of the screen.
(d) The voltage on R139 should be below 1.0V if it is tested by DVM.
12. OSD POSITION ADJUSTMENAT
(a) Set the RECALL on the remote control.
(b) Adjust OSD control C816 until the caption display appears on the upper right corner of the screen.
13. COLOR SYNC ADJUSTMENT
(a) Tune in a color bar pattern signal.
(b) Set the contrast control to minimum, and the color control to maximum.
(c) Set VR801 to the center position.
(d) Connect a resistor 10kO between TP11 and TP15.
(e) Short L203 to GND by jumper wire.
(f)
Adjust the color sync, variable capacitor C246 so that the color bar pattern stands still.