JVC AV-56P776 Service Manual page 51

Measuring
Item
instrument
SUB COLOR / Signal
SUB TINT / generator
B-Y GAIN
adjustment (2) Oscilloscope
Remote
control unit
W
Setting item
A
STANDARD
Signal
S01 S02
(W-R) (W-Y)
NTSC +26 +11
480i +23 +11
480p +19 +11
1080i +15
1-50 (No.YA318)
Test point Adjustment part
TP-R [1.PICTURE/SOUND]
[R CRT S01 : COLOR
SOCKET PWB] S02 : TINT
TP-B S07 : B-Y
[B CRT
SOCKET PWB]
TP-E (GND)
(-)
0
(+)
Y (W-Y) R (W-R)
Fig.1
(-)
0
(+)
W
(W-B)
B
Fig.2
Setting value [V]
B C
THEATER STANDARD
S01 S02 S07
(W-R) (W-Y) (W-B)
+15 +3 +4
+5 -4 -15
-6 -3 -24
+5 +5 +4 -20
Table
[ Method of adjustment with measuring instrument ]
(1) Receive NTSC color bar signal (include 75% white).
(2) Select STANDARD mode with [VIDEO STATUS]
key.
(3) Connect the oscilloscope to TP-R.
(4) Select 1.PICTURE/SOUND from SERVICE MENU.
(5) Select < S01 > (COLOR) and < S02 > (TINT).
(6) Adjust < S01 > and < S02 > to be following setting
value A[V]. (Refer to the table)
(7) Press [MUTING] key to memorize the set values.
(8) Select THEATER mode with [VIDEO STATUS] key.
(9) Adjust < S01 > and < S02 > to be following setting
value B[V] same as above. (Refer to the table)
(10) Press [MUTING] key to memorize the set values.
(11) Select STANDARD mode with [VIDEO STATUS]
key.
(12) Connect the oscilloscope to TP-B.
(13) Adjust < S07 > (B-Y) to be setting value C[V]. (Refer
to the table)
(14) Press [MUTING] key to memorize the set values.
(15) Select THEATER mode with [VIDEO STATUS] key.
(16) Adjust < S07 > to be setting value D[V]. (Refer to the
table)
(17) Press [MUTING] key to memorize the set values.
(18) Confirm that LOW-LIGHT is not different after
adjusting. If it is green or magenta, to adjust LOW-
LIGHT again. If adjust again, to set offset value
again.
(19) Input 480i component color bar signal from
COMPONENT VIDEO terminal.
(20) Repeat steps 2 to 17 above.
(21) Input 480p component color bar signal from
COMPONENT VIDEO terminal.
(22) Repeat steps 2 to 17 above.
(23) Input 1080i component color bar signal from
COMPONENT VIDEO terminal.
(24) Repeat steps 2 to 17 above.
D
THEATER
S07
(W-B)
+8
-13
-40
-25
Description