Sharp 27U-S50 Service Manual page 6

27U-S50
For adjustments of this model, the bus data is converted to various analog signals by the D/A converter circuit.
Note: There are still a few analog adjustments in this series such as focus and master screen voltage. Follow
the steps below whenever the service adjusment is required.
To enter the service mode and exit service mode.
While pressing the Vol-up and Ch-up buttons at the sametime, plug the AC cord into a wall socket.
Now, the TV set is switched on and enters the service mode.
To exit the service mode, turn the television off by pressing the power button.
1. Service mode.
Before putting unit into the service mode, check that customer adjustments are in the normal mode. Use the reset
function in the video adjustment menu to ensure customer control are in their proper (reset) position.
2. Service number selection.
In the service mode, you will see the window screen as window 1. There are 4 adjustment categories 2DEF,
3SIGNAL, 4FEATURE, 5FIX VALUE as show in Figure A.
Window 2: DEF
D01
D03
D05
RETURN
RETURN
RETURN
Window 4: FEATURE
M01
M03
M05
RETURN
Press CH UP/DOWN button for selection and enter by VOL UP or VOL DOWN.
Press CH UP/DOWN button to select the adjustment item and VOL UP/DOWN
to adjust the data number for each categories.
(OSD disturbance can be erased by R/C display key)
(Note: EEPROM - factory used only)
D02
DEF
D04
D06
Window 1: ADJUSTMENT CATEGORIES
SERVICE MODE
DEF
SIGNAL
FEATURE
FIX VALUE
EEPROM
Window 5: FIX VALUE
M02
FEATURE F01
M04
F13
RETURN
Figure A: ADJUSTMENT CATEGORIES
Window 3: SIGNAL
SIGNAL
FIX VALUE
F02
NEXT
F14
NEXT
PREVIOUS
6
S01 S02
S13 S14
RETURN
RETURN
RETURN
F15 F16
F26
F27
RETURN PREVIOUS