JVC AV-48WP34/AHA Service Manual page 47

VIDEO ADJUSTMENT
Measuring
Item
Instrument
A-D CONVERTER Signal
OFFSET generator
adjustment
Remote
control unit
GBK
TP-E
CRT SOCKET PWB
RGB CUTOFF Signal
generator
adjustment
Oscilloscope
GBK
TP-E
CRT SOCKET PWB
Test point Adjustment Item
KG ADM013:
[G CRT
SOCKET PWB]
ADM012:
KB
ADM014:
[B CRT
SOCKET PWB]
KR
[R CRT
SOCKET PWB]
RGK
E
KG / KB / KR
CRT cathode
TP-R S14: R CUTOFF
[R CRT
S16: G CUTOFF
SOCKET PWB]
S18: B CUTOFF
TP-G
[G CRT
SOCKET PWB]
TP-B
[B CRT
SOCKET PWB]
RGK
E
TP-R
TP-G
TP-B
No. 51914
*
Select the STANDARD mode for the VIDEO STATUS.
G OFFSET
1. Receive a whole black (0%) signal.
2. Select REGULAR mode of ASPECT mode.
R OFFSET
3. Select that COLOR TEMP in set at the LOW mode.
B OFFSET
4. Connect the oscilloscope to KG (G cathode) on the G
CRT SOCKET PWB.
5. Select 8.PP from the SERVICE MENU.
Select ADM013 ＜ G OFFSET ＞ .
6.
7. Adjust ADM013 as 0% signal and outside from are set
to same values.
8. Connect the oscilloscope to KB (B cathode) on the B
CRT SOCKET PWB
Select ADM014 ＜ B OFFSET ＞ .
9.
10. Adjust ADM014 ＜ B OFFSET ＞ as 0% signal and
outside from are set to same values.
11. Connect the oscilloscope to KR (R cathode) on the R
CRT SOCKET PWB
12. Select ADM012 ＜ R OFFSET ＞ .
13. Adjust ADM012 ＜ R OFFSET ＞ as 0% signal and
outside from are set to same values.
14. Press the MUTING key to memorize.
15. After adjustment, data of ADM012, ADM013, ADM014
are used to adjustment of other signal.
*
Select the STANDARD mode for the VIDEO STATUS.
1. Receive half color bar signal (include -3%).
2. Select that COLOR TEMP in set at the LOW mode.
3. Connect the oscilloscope to TP-G.
Adjust S16 ＜ G CUTOFF ＞ to mach -3% DC level to
4.
180V.
5. Press the MUTING key to memorize.
NOTE : Adjusting S16, change the only up. If DC level
is low at the initial value of CUTOFF, adjust
S03 (brightness).
6. Input 1080i black level pattern signal and input the
value adjusted at NTSC to S16 ＜ G CUTOFF ＞ .
7. Press the MUTING key to memorize.
8. Input 480i black level pattern signal and input the value
adjusted at NTSC to S16 ＜ G CUTOFF ＞ .
9. Press the MUTING key to memorize.
10. In case of TP-R, TP-B, repeat step 4. ～ 6 above.
If the value of S14 or S18 is max or min, change S20 ＜ R
CUTOFF SW ＞ , S21 ＜ B CUTOFF SW ＞ and then
adjust S14, S18.
11. Adjust each R / G / B screen VR on the FOCUS PACK,
and glimmer +3% point of each R / G / B on the screen.
AV-48WP30
Description
41