Sharp LC-121M2U Service Manual page 12

LC-121M2U
LC-150M2U
5-6-2. AV input Adjustment
Adjustment
1 Brightness adjustment
(N358)
2 R-cut off adjustment
3 B-cut off adjustment
4 Unicolor adjustment
(N358)
5 R DRIVE adjustment
Adjustment conditions
1. Input the standard color bar signal
(the same pattern as that of JPN-8CH)
of N358 into AV1.
2. Connect the oscilloscope to TP821
(IC803, pin7, G output).
1. Input the standard color bar signal
(the same pattern as that of JPN-8CH)
of N358 into AV1.
2. Connect the oscilloscope to TP821
(IC803, pin7, G output).
3. Connect the oscilloscope to TP819
(IC803, pin1, R output).
1. Input the standard color bar signal
(the same pattern as that of JPN-8CH)
of N358 into AV1.
2. Connect the oscilloscope to TP821
(IC803, pin7, G output).
3. Connect the oscilloscope to TP820
(IC803, pin8, B output).
1. Input the standard color bar signal
(the same pattern as that of JPN-
8CH) of N358 into AV1.
2. Connect the oscilloscope to TP821
(IC803, pin7, G output).
1. Input the standard color bar signal
(the same pattern as that of JPN-
8CH) of N358 into AV1.
2. Connect CH1 of oscilloscope to
TP821 (G output).
3. Connect CH2 of oscilloscope to
TP819 (R output).
12
Adjustment method
1. Adjust N358 BRIGHTNESS, and
adjust the black level of G output so
as to get DC 1.5±0.05V.
1. Adjust R CUTOFF so as to equalize
the black levels of green and red.
1. Adjust B CUTOFF so as to equalize
the black levels of green and blue.
1. Adjust N358UNICOLOR, and
adjust so as to get 100% white-
black level video component equal
to 2.3±0.05Vp-p.
1. Adjust so as to get 100% white level
identical with that of green.
LC-121M2U
LC-150M2U