Sharp DV-L70S Service Manual page 11

Adjustment VR STIN
Adjustment Point Connect the oscilloscope to 5PIN (VB) and GND of TP1901.
Input Signal/Setting 100% color bar
Adjustment Method It is adjusted so that shakes of the waveform of the blue signal of the color bar may become the
smallest.
(3) TV3 adjustment
Adjustment VR COM
Adjustment Point Specified adjustment jig (illuminometer) or visual observation
Input Signal/Setting No input state
Brightness: Center
Perform it in a combination of PWB and the liquid crystal panel which will be supplied as
products finally.
Adjustment Method • When using the specified adjustment jig
Connect the output of jig to the oscilloscope and
adjust the waveform to the minimum point.
At this time, perform the adjustment several times
to fix the optimal point because the measuring value
hardly changes around the optimal point.
• In case of visual adjustment
Stand or tilt the panel as shown in the figure and check
by shaking your head and seeing whether stripes appear.
If the adjustment is improper, you will see stripes in the
longitudinal direction. Perform the adjustment so that they
do not appear.
Adjustment VR OSDH
Adjustment Point Visual observation
Adjustment method Adjust the OSDH of TV3 to 27 mm from the right of screen.
Adjustment VR B BRI
Adjustment method Set the B brightness to "76".
2. OPT adjustment
Adjustment VR OPT adjustment
Initialization It is set respectively in WIDE "03", OSDV"00", BL"01", PAL"00".
3. BAR adjustment
Adjustment VR BAT adjustment
Initialization Stabilized power supply, in the body, connection.
It is made DVD start rise state, and a BACKLIGHT(HI/LOW/OFF) key is pushed and made "HI".
The voltage of the stabilized power supply is adjusted to become 6.4±0.05V in the stabilized
power supply connection part (at DC JACK).
Adjustment Method It is set so that the numerical value of the BAT display may become "00"
(Type drawing)
11
Optimal point
Adjust within the above
range to fix the optimal point
Direction of stripe
27mm
B brightness
DV-L70S
DV-L70BL
DV-L70W