Sharp 37VT-26H Service Manual page 14

37VT-26H(GY)
Ë Ë Ë Ë Ë CRT CUT-OFF, BACKGROUND AND SUB-CONTRAST ADJUSTMENT (1)
1. CRT CUT-OFF (I
1. Receive the monoscope pattern signal.
2. Put the set in the service mode and call up the DIRECT mode (DIRCT).
3. Set the screen control to 0/10 position.
4. Press the "CONFIRM" key on the remote controller to reach the horizontal centering mode. (S-PICTURE key on
the set)
5. Turn the screen control clockwise until the horizontal raster of the first glimmering colour becomes slightly
visible.
6. Adjust the cut-off data of the other two colours until the horizontal raster becomes whitish.
Note : The data can be turned up and down with the above keys.
» R CUT OFF UP
» R CUT OFF DOWN "4" KEY
» G CUT OFF UP
7. Turn the screen control counterclockwise until the horizontal raster disappears.
Note : Before starting this adjustment, warm up the unit for 30 minutes or longer at a beam current of over
600 µA.
8. Press the "CONFIRM" key on the remote controller to call up the NORMAL mode. (S-PICTURE key on the set)
SUB-BRIGHTNESS (I
9. Using the remote controller, call the SUB-BRIGHT setting mode (BRI). (Receive the crosshatch and gray scale
signal.)
10.Set the sub-brightness data so that the third black portion (1st to 5th counted from the left of the screen) of the
window pattern looks sinking.
Note : The service mode adjustment in the above steps 9. and 10. should be carried out after the white
balance and background adjustments.
11.Exit from the service mode.
2. WHITE BALANCE AND BACKGROUND (I
1. Receive the monoscope pattern signal.
2. Put the set in the service mode and call up the DIRECT mode (DIRCT).
3. Connect the beam ammeter between TP601 and TP602.
4. Using the sub-contrast control, roughly adjust the beam current to about 700 µA.
5. Adjust the G-drive and B-drive data to have a colour temperature of 9,000°K (white).
» 9,000°K
(with a Minolta colour temperature meter CA-100)
Note : The data can be turned up and down with the above keys.
» G-DRIVE UP
» G-DRIVE DOWN "
6. Adjust the contrast and brightness controls to have the beam current of 200 µA or so. Now check the back-
ground colour. If the colour temperature is not as specified, go back to No. 1 on the preceding page.
7. Exit from the service mode.
Note : Before starting this adjustment, warm up the unit for 30 minutes or longer at a beam current of over
600 µA.
2 C bus data adjustment)
"1" KEY
"2" KEY
2 C bus data adjustment)
x : 0.290
y : 0.284
"7" KEY
Õ õ
" KEY
» G CUT OFF DOWN "5" KEY
» B CUT OFF UP
"3" KEY
» B CUT OFF DOWN "6" KEY
2
C bus data adjustment)
» B-DRIVE UP
» B-DRIVE DOWN "0" KEY
14
"8" KEY