Sharp LC-20VM2E Service Manual page 12

LC-20VM2E
6-6. Service Adjusting
6-6-1. Main chassis adjustment
Adjustment
1 +B Adjustment
(+B ADJ Item)
2 Setting
(MODEL)
(SYSTEM)
(COPY GUARD)
(MASK)
3 Counter-bias adjustment 1. Set the AV1 mode to set signal
(COM Item)
4 NTSC / PALM OSC
adjustment
(NTSC/PALM OSC Item)
6-6-2. N358 signal adjustment
Adjustment
1 Brightness adjustment
(N358 BRIGHTNESS Item)
2 R CUTOFF adjustment
(R CUTOFF Item)
Adjusting conditions
1. Connect the DC voltmeter to
TP1101
noninput state.
2. Fit the specified adjusting instrument
to the screen center.
3. Observe the adjusting instrument
output on the oscilloscope.
1. Input the NTSC monoscope
pattern to AV1.
Adjustment conditions
1. Input the NTSC standard color bar
to AV1.
2. Connect the oscilloscope to TP821
(IC316, pin7, G output).
1. Input the NTSC standard color bar
to AV1.
2. Connect CH1 of the oscilloscope to
TP821 (IC316, pin7, G output).
3. Connect CH2 of the oscilloscope to
TP819 (IC315, pin1, R output).
12
Adjusting method
1. Adjust the DC/DC 5V line output
voltage so as to get 5.0±0.05V.
( DAC 16ch )
MODEL
SYSTEM
COPY GUARD
MASK
1. Adjust COM so as to minimize the
waveform peak-peak.
(DAC2 2ch)
1. Adjust OSC so as to get the normal
screen.
Adjustment method
1. Adjust N358 BRIGHTNESS, and
adjust the black level of G output so
as to get DC 0.35±0.05V.
1. Adjust R CUTOFF so as to equalize
the black levels of green and red.
LC-121M2E
LC-150M2E
V2E
AUTO
ON
OFF