Sharp LC-30HV4U Service Manual page 24

LC-30HV4U
LC-30HV4D
(2) Tuner adjustment
Item
1 Signal setting
2 Tuner level Adjustment
Adjusting conditions/points
Signal:
NTSC RF Signal
(Split field color bar)
Input terminals:
ANT-A, ANT-B
US channel 10 received
Page: 4
Locations: TP1101, TP1102
24
Adjusting procedure
• Use a signal generator to provide the tuner with a
RF signal of 193.25 MHz on the split field color bar.
• The color saturation of the color bar must be 75%.
A 100% white area must be included.
• Make sure the 100% white area (synchronized)
shows 2.00 Vp-p when the color bar opens in
video mode. If not, adjust the signal generator.
1.Provide the above RF signal to ANT-A and adjust
"TUNER DAC ADJ" so that the tuner output is
1.0 ± 0.02 Vp-p at TP1101 when US channel 10 is
received.
1.0Vp-p
2.Provide the above RF signal to ANT-B and adjust
"TUNER B DAC ADJ" so that the tuner output is
1.0 ± 0.02 Vp-p at TP1102 when US channel 10 is
received.
1.0Vp-p
TP1101
TP1102