JVC GX-N7E - Page 25

Measuring _ r
No. it
em instrument Test point and Adjustment part
Description
4
[va
R,G,B | Oscilloscope | (F12) (TPB) R241 (INDOOR _| © Set the IRIS CNTROL SWITCH to AUTO
GAIN H-rate B SET)
Adjustment ( 10:1 (GP) (TP-R} R243 (INDOOR {Note} The AUTO WHITE SWITCH must be
RSET) set at the “INDOOR” position.
[MOTHER BOARD]
1. Measure and adjust RO7 (GIN GAIN)
(TP-G) R07 (G IN GAIN) so that the portion shown in Fig. 3-14 (a)
Gray scale [GAMMA [GAMMA BOARD] becomes 1Vp-p.
pattern BOARD}
Vp-p
{H)
Fig. 3-14 {a}
2. Measure and adjust R241(INDOOR B
SET) so that the portion shown in Fig. 3-14
(b) becomes 1Vp-p.
Fig. 3-14 (b)
3. Measure 13) and adjust R243 (INDOOR R
SET) so that the portion shown in Fig. 3-14
(c) becomes 1Vp-p.
Vp-p
(H)
Fig, 3-14 (c)
S#i —e
(No. 5550) 27E
Measuring T
instrument
Test point and Adjustment part
Description ]
WHITE
BALANCE
Adjustment
COLOR ¥ | Oscilloscope
‘| vipeo OUT
(ey)
10:1
Gray scale
pattern
ee bes :
=e bell
tae ir |
R GAIN BGAIN
Vectorscope | VIDEO OUT
Gray scale
pattern
28E (No. 5550)
R15 (R GAIN)
R18 (B GAIN)
R14 (R-y)
R16 {B-y)
[GAMMA BOARD]
2. Concurrently observe the oscilloscope, and
Adjustment procedure with oscilloscope
© Set the IRIS CONTROL SWITCH to AUTO
1. Measure the VIDEO OUT, and adjust
R15 {R GAIN) and R18 (B GAIN) so that
the carrier at section @ shown in Fig, 3-15
{a) is minimized.
Fig. 3-15 (a)
2. Adjust R14 (R-y) and R16 (B-y) so that
the carrier at section shown in Fig. 3-15
is rninimized.
3. When carriers remain in the dark sections of
waveforms, repeat 3-12 BLK SET Adjust-
ment.”
[Adjustment procedure with vectorscope “|
© Set the IRIS CONTROL SWITCH to AUTO
1. As shown Fig. 3-15 (b), adjust R15 (R
GAIN), R18 (BGAIN), R14 (R-y), and
R16 (B-y) so that the carriers converge
at the center.
Fig. 3-15 (b)
when carriers are found to be remaining
in the dark sections of waveforms, repeat
"3-12 BLK SET Adjustment.”