Sharp LC-121M2U Service Manual page 11

LC-121M2U
LC-150M2U
8 DAC 2 1ch
DAC 2 2ch
DAC 2 3ch
DAC 2 4ch
DAC 2 5ch
DAC 2 6ch
DAC 2 7ch
DAC 2 8ch
DAC 2 9ch
DAC 2 10ch
DAC 2 11ch
DAC 2 12ch
5-6. Service Adjusting
5-6-1. Basic Adjustment
Adjustment
1 +B Adjustment
2 Model setup
3 Counter-bias adjustment 1. Set the AV1 mode to set signal
4 NTSC / PAL-MOSC
adjustment
0 255
0 255
0 255
0 255
0 255
0 255
0 255
0 255
0 255
0 255
0 255
0 255
Adjusting conditions
1. Connect the DC voltmeter to
TP1104
1. Select the model "M2U".
noninput state.
2. Fit the specified adjusting instrument
to the screen center.
3. Observe the adjusting instrument
output on the oscilloscope.
1. Input the monoscope pattern of
NTSC into AV1.
11
0 Fixed
0 Fixed
0 Fixed
0 Fixed
0 Fixed
0 Fixed
0 Fixed
0 Fixed
0 Fixed
0 Fixed
0 Fixed
0 Fixed
1. Adjust +B-ADJ to 5.1V ± 0.05V.
( DAC 9ch )
When M2U is selected, the item
settings are as follows.
TUNER
AUDIO MULTIPLEX
BOOSTER
SYSTEM
COPY GUARD
CH MEMORY
SECAM
MULTI LANG.
TIMER
1. Adjust COM so as to minimize the
waveform peak-peak.
(DAC7ch)
1. Adjust NTSC/PALM OSC so as to
get the normal screen.
(DAC8ch)
LC-121M2U
LC-150M2U
Adjusting method
OFF
OFF
0
AUTO
ON
OFF
ON
OFF
OFF