JVC AV-56P776 Service Manual page 47

4.6.4 VIDEO ADJUSTMENT
Measuring
Item
instrument
RGB CUTOFF Signal
adjustment generator
Oscilloscope
Remote
control unit
Item No. Item name
S03 BRIGHT
S14 CUTOF R
S16 CUTOF G
S18 CUTOF B
S20 CUTOFSWR
S21 CUTOFSWG
S22 CUTOFSWB
1-46 (No.YA318)
Test point Adjustment part
TP-R [1.PICTURE/SOUND]
[R CRT S14: CUTOF R
SOCKET PWB] S16: CUTOF G
TP-G S18: CUTOF B
[G CRT
SOCKET PWB] R SCREEN VR
TP-B G SCREEN VR
[B CRT B SCREEN VR
SOCKET PWB] [FOCUS PACK]
Initial setting value
127
185
185
185
001
001
001
Description
(1) Receive NTSC signal (include 0% or -3% black).
(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 < S03 > (BRIGHT).
(8) Set < S03 > to 127.
(9) Select < S16 > (CUTOF G).
(10) Adjust < S16 > so that the 0% or -3% signal portion
and the 100% signal portion of both sides may
become the 180V.
(11) Press [MUTING] key to memorize the set value.
(12) Receive 480i component signal (include 0% or -3%
black).
(13) Select < S03 >.
(14) Set < S03 > to 127.
(15) Select < S16 >.
(16) Set < S16 > same as memorized NTSC value.
(17) Select STANDARD mode with [VIDEO STATUS]
key.
(18) Select FULL mode with [ASPECT] key.
(19) The COLOR TEMP set at the LOW mode.
(20) Set 1080i component signal (include 0% or -3%
black).
(21) Select < S03 >.
(22) Set < S03 > to 127.
(23) Select < S16 >.
(24) Set < S16 > same as memorized NTSC value.
(25) Connect the oscilloscope to TP-R and < S14 >
(CUTOF R) adjust same manner as for (6.) to (11.)
above.
(26) Connect the oscilloscope to TP-B and < S18 >
(CUTOF B) adjust same manner as for (6.) to (11.)
above.
(27) Adjust SCREEN VR for RGB respectively, so that
the black (3%) becomes faintly whitish.
NOTE :
If it is difficult to adjust the SCREEN precisely,
adjust the SCREEN VR for one of 3 colors while
masking other 2 colors.