Sharp 29RX5 Service Manual page 17

CRTCU~OF~BACKGROUNDANDSUB~ONTRAST
ADJUSTMENT
1. CRT CUT-OFF ADJUSTMENTS
Adjusting Point
IIIl Sub-Brightness: R890
1. Receive E-5CH "MONOSCOPE PATTERN"signal.
2. Using the remote controller, call up the P-NORM
mode.
3. Turn on the service switch and select the cut-off/
n
n-.
background mode.
I
4. Connect the oscilloscope to TP852 (RED cathode). 10", 1Vp-p
5. Set the screen control to 0/10 position.
6. Press the "0/_" key on the remote controller to reach
the horizontal centering mode.
7. Adjust the sub-briqhtness control (R890) so that
the blanking pulse on the oscilloscope screen be
10 ± 1Vp-p.
8. Disconnect the oscilloscope from TP852.
9. Turn the screen control counterclockwise until the horizontal raster becomes whitish.
10. 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.
o
R CUT OFF UP "1" key
0
G CUT OFF DOWN "5" key
• R CUT OFF DOWN "4" key
0
B CUT OFF UP "3" key
o
G CUT OFF UP "2" key
0
B CUT OFF DOWN "6" key
11. 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 1400
±50lJA·
12.Press the "0/_" key on the remote controller to call the normal mode.
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2. WHITE BALANCE and BACKGROUND FC BUS ADJUSTMENT
1. Receive the E-5CH "MONOSCOPE PATTERN" signal.
2. Using the remote controller, call the Video Normal mode.
3. Connect the beam ammeter between TP601 and TP602.
4. Roughly adjust R1631 (sub-contrast control) to have a beam current of about 1.6mA.
5. Receive the J-12CH (window pattern) signal. (Or receive the white balance pattern signal.)
6. Adjust the G-drive and B-drive data to have a colour temperature of 12300 QK (white).
·12300"K X: 0.272
Y: 0.275
(with a Minolta colour temperture meter CA-100)
Note:The data can be turned up and down with the above keys.
o
G-DRIVE UP "7" key
0
B-DRIVE UP "8" key
o
G-DRIVE DOWN
"~"
key • B-DRIVE DOWN "0" key
7. Using the R-CUT OFF, G-CUT OFF, and B-CUT OFF controls, adjust the white/dark portion to 12300"K.
8. Readjust the color temperature at the white peak.
9. Check the white/dark portion to make sure the colour temperature is 12300"K.
Note:Before starting this adjustment, warm up the unit for 30 minutes or longer at a beam current of 1400
±50lJA·
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