Magnavox 20MC4304/17, Service Manual

Page: 27 / 117

1-7-6 T1102EA
8. Setting for 7F DATA/SLP REC/
MONO Data Values
1. Enter the Service mode. (See page 1-7-1.)
2. 7F Data Adjustment: Press [VOL
p
] button on
the service remote control unit once to show “7F”
on the display.
SLP REC Adjustment: Press [VOL
p
] button on
the service remote control unit twice to show “SLP
R” on the display.
MONO Adjustment: Press [VOL
p
] button on the
service remote control unit three times to show
“MONO” on the display.
3. 7F Data Adjustment: Select “FF” by pressing
[CH.
o
/
p
] buttons on the service remote control.
SLP REC Adjustment: Select “+2” by pressing
[CH.
o
/
p
] buttons on the service remote control.
MONO Adjustment: Select “ON” by pressing [CH.
o
/
p
] buttons on the service remote control.
9. White Balance Adjustment
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Note: Use service remote control unit
1. Operate the unit more than 20 minutes.
2. Face the unit to the east. Degauss the CRT using
a degaussing coil.
3. Input the White Raster (APL 100%).
4. Set the color analyzer to the CHROMA mode and
after zero point calibration, bring the optical
receptor to the center on the tube surface (CRT).
5. Enter the Service mode. Press [VOL
p
] button on
the service remote control unit and select “C/D”
mode. (Display changes “C/D”, “7F” and Initial
Setting cyclically when [VOL
p
] button is pressed.)
6. Press [4] button on the service remote control unit
for Red adjustment. Press [5] button on the service
remote control unit for Blue adjustment.
7. In each color mode, press [CH.
o
/
p
] buttons to
adjust the values of color.
8. Adjust Red and Blue color so that the temperature
becomes 9200K (x: 286 / y: 294) ±3%.
9. At this time, re-check that horizontal line is white. If
not, re-adjust Cut-off Adjustment until the
horizontal line becomes pure white.
10. Turn off and on again to return to normal mode.
Receive APL 100% white signal and confirm that
Chroma temperatures become 9200K (x: 286 / y:
294) ±3%.
Note: Confirm that Cut Off Adj. is correct after this
adjustment, and attempt Cut Off Adj. if needed.
Fig. 5-2
[VOL ] button
7F DATA Adjustment (Factory mode)
[CH. ]
button
[VOL ]
button
[VOL ] button
7F= FF 7F= 00
[CH. ]
button
SLP REC Adjustment
[CH. ]
button
SLP R= +2 SLP R= 0
[CH. ]
button
MONO Adjustment
[CH. ]
button
MONO= ON MONO= OFF
[CH. ]
button
Test Point Adj. Point Mode Input
Screen
[CH.
o
/
p
]
buttons
RF
White Raster
(APL 100%)
Tape M. EQ. Spec.
---
Pattern
Generator,
Color analyzer
See below
Figure
Fig. 6
Color Analyzer