JVC AV28H20EUS Service Manual page 29

Measuring
Item
instrument
BOW
adjustment
V-S.CR
&
V.LINEARITY
adjustment
Test point Ad justment part
11.BOW
Fig. B
12.V-S.CR
13.V-LIN
TOP
CENTER
BOT TOM
No. 51945
Description
•
In case where th ere is a bow-shaped distortion o f images
on the screen. ( Fig.B)
1. Select 11.BOWwith the FUNCTION UP/DOWN ( / ) key.
2. Adjust BOW, and bring the VERTICAL lines straight.
3. Press the MENU key and memoriz e the s et value.
•
When the vertical linearity has been deteriorated
rem arkably, perform the following steps
1. Receive a cross-hatch signal.
2. Select 13.V-LIN with the FUNCTION UP/DOW N ( / )k ey.
3. Set the initial setting value of 13.V-LIN with the FUNCTION
- / + ( / ) key.
4. Select 12.V-S.COR with the FUNCTION UP / DOWN ( / )
key.
5. Set the initial setting value of 12.V-S.COR with the FUNCTION
- / + ( / ) key.
6. Adjust 13.V-LIN and 12.V-S.COR so that the spaces of eac h
line on TOP, CENTER and BOTTOM bec ome uniform.
NOTE : Do not adjust PANORAMIC & SUBTIT LE mode.
At first the adjustment in 100Hz FULL mode should be done,
then the data for the other aspect mode is corrected in the
respective value at the s ame time. And confirm the deflection
adjustment initial setting value in 120Hz (NTSC EXT mode)
FULL mode. If the adjustment in 100Hz eac h aspect mode has
been done and stored, the data for the s ame as pect modes in
120Hz is corrected in the res pective value. Only the data for the
other as pect mode in 120Hz is corrected for its elf.
AV32H20EUS
AV28H20EUS
AV28H20EUB
.
29