Read Sharp LC-20VM2E (serv.man2) Service Manual online
12
LC-20VM2E
LC-121M2E
LC-150M2E
LC-150M2E
6-6. Service Adjusting
6-6-1. Main chassis adjustment
Adjustment
Adjusting conditions
Adjusting method
1
+B Adjustment
1. Connect the DC voltmeter to
1. Adjust the DC/DC 5V line output
(+B ADJ Item)
TP1101
voltage so as to get 5.0
±
0.05V.
( DAC 16ch )
2
Setting
(MODEL)
MODEL
V2E
(SYSTEM)
SYSTEM
AUTO
(COPY GUARD)
COPY GUARD
ON
(MASK)
MASK
OFF
3
Counter-bias adjustment
1. Set the AV1 mode to set signal
1. Adjust COM so as to minimize the
(COM Item)
noninput state.
waveform peak-peak.
2. Fit the specified adjusting instrument
(DAC2 2ch)
to the screen center.
3. Observe the adjusting instrument
output on the oscilloscope.
4
NTSC / PALM OSC
1. Input the NTSC monoscope
1. Adjust OSC so as to get the normal
adjustment
pattern to AV1.
screen.
(NTSC/PALM OSC Item)
6-6-2. N358 signal adjustment
Adjustment
Adjustment conditions
Adjustment method
1
Brightness adjustment
1. Input the NTSC standard color bar
1. Adjust N358 BRIGHTNESS, and
(N358 BRIGHTNESS Item)
to AV1.
adjust the black level of G output so
2. Connect the oscilloscope to TP821
as to get DC 0.35
±
0.05V.
(IC316, pin7, G output).
2
R CUTOFF adjustment
1. Input the NTSC standard color bar
1. Adjust R CUTOFF so as to equalize
(R CUTOFF Item)
to AV1.
the black levels of green and red.
2. Connect CH1 of the oscilloscope to
TP821 (IC316, pin7, G output).
3. Connect CH2 of the oscilloscope to
TP819 (IC315, pin1, R output).
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