Electrical Adjustment - Sharp XV-310P Service Manual

Note: Unless othenkise specified, all the adjustment& should be made in the standard
conditions.
Adjustment position
AGC (Automatic
Gain Control):
RI 546
2
3
Sub-brightness:
4
(Green),
5
Adjustment condition
pattern signal.
Connect the voltmeter between
l
gamma correction.
TP1602 and GND.
If the signal is out of sync or the
white portion is degraded, turn
RI 604 to restore the original state.
pattern signal.
Apply 5 V to TP2001 via a 6.8-kohm
l
resistor.
Receive the NTSC colour bar signal.
l
Connect the oscilloscope between
l
TP1602 and GND.
Receive the NTSC colour bar signal.
l
Connect the oscilloscope between
l
Adjustment method
Adjust RI 546 so that the voltmeter
should read 3.0 f 0.05V.
Adjust R861 so that the difference
between the sync level and the
100% white level be' 5.8 f 0.1 Vp-p.
100% white level
Sync level
Keep TP1604 under 5 V load and
then under no load.
Repeat this several times. Adjust
R2139 so that the DC level at the
front porch be unchanged
whether TP1604 is under load or
not.
Front porch' s DC level
to be unchanged
Turn RI 604 so that the peak of the
sync signal be at -5.5 + 0.5 V.
DC level at TPI 602 + 0. I V
5.8 Vp-p