JVC AV-56P776 Service Manual page 49

Measuring
Item
instrument
SUB BRIGHT Signal
adjustment generator
Remote
control unit
Signal
Item
NTSC
127
S03
SUB Signal
CONTRAST generator
adjustment (1)
Remote
control unit
Signal
Item
NTSC
052
S04
SUB Signal
CONTRAST generator
adjustment (2)
Oscilloscope
Remote
control unit
SETTING VOLTAGE [AV-48P776 / AV-48P786]
Signal
NTSC
Video status
STANDARD 102V
THEATER 102V
SETTING VOLTAGE [AV-56P776 / AV-56P786]
Signal
NTSC
Video status
STANDARD 86V
THEATER 84V
1-48 (No.YA318)
Test point Adjustment part
[1.PICTURE/SOUND]
S03: BRIGHT
Setting value
480i 1080i
127 127
Table 1
[1.PICTURE/SOUND]
S04: CONTRAST
Setting value
480i 1080i
061 061
Table 2
TP-G [1.PICTURE/SOUND]
[G CRT S04: CONTRAST
SOCKET PWB]
480i 1080i
104V 100V
104V 94V
480i 1080i
92V 86V
92V 86V
Table 3
Description
(1) Receive NTSC signal.
(2) Select STANDARD mode with [VIDEO STATUS] key.
(3) Set the COLOR TEMP is LOW mode.
(4) Select 1.PICTURE/SOUND from SERVICE MENU.
(5) Select < S03 > (BRIGHT).
(6) Set the initial setting value. (See Table 1)
(7) If the brightness is not the best with the initial setting
value, make fine adjustment until you get the best
brightness.
(8) Press [MUTING] key to memorize the set values.
(9) Select THEATER mode with [VIDEO STATUS] key.
(10) Repeat steps 4 to 8 above.
(11) Input 480i component signal from COMPONENT
VIDEO terminal.
(12) Repeat steps 2 to 10 above.
(13) Input 1080i component signal from COMPONENT
VIDEO terminal.
(14) Repeat steps 2 to 10 above.
[ Method of adjustment without measuring instrument ]
(1) Receive NTSC gray scale signal.
(2) Select STANDARD mode with [VIDEO STATUS]
key.
(3) Set the COLOR TEMP is LOW mode.
(4) Select 1.PICTURE/SOUND from SERVICE MENU.
(5) Select < S04 > (CONTRAST).
(6) Set the initial setting value. (See Table 2)
(7) If the contrast is not the best with the initial setting
value, make fine adjustment of the < S04 > until you
get the optimum contrast.
(8) Press [MUTING] key to memorize the set values.
(9) Select THEATER mode with [VIDEO STATUS] key.
(10) Repeat steps 4 to 8 above.
(11) Input 480i component black & white signal from
COMPONENT VIDEO terminal.
(12) Repeat steps 2 to 9 above.
(13) Receive 1080i component black & white signal from
COMPONENT VIDEO terminal.
(14) Repeat steps 2 to 9 above.
[ Method of adjustment with measuring instrument ]
(1) Receive NTSC gray scale signal.
(2) Select STANDARD mode with [VIDEO STATUS] key.
(3) Select FULL mode with [ASPECT] key.
(4) Set the COLOR TEMP is LOW mode.
(5) Connect the oscilloscope to TP-G.
(6) Select 1.PICTURE/SOUND from SERVICE MENU.
(7) Select < S04 > (CONTRAST).
(8) Adjust < S04 > so that the 0% signal portion and the
100% signal portion of both sides may become the
follow table voltage.
(9) Press [MUTING] key to memorize the set value.
(10) Select THEATER mode with [VIDEO STATUS] key.
(11) Repeat steps 8 to 9 above.
(12) Receive 480i component gray scale signal.
(13) Repeat steps 2 to 9 above.
(14) Set 1080i component gray scale signal.
(15) Repeat steps 2 to 9 above.