JVC AV-28BT8ENS Service Manual page 18

AV-28BT8ENS / AV-28BT8ENB / AV-28BT80EN
AV-28BT8EPS / AV-28BT8EPB / AV-28BT80EP
AV-28BT8EES / AV-28BT8EEB/ AV-28BS88EN
■ ■ ■ ■ GEOMETRY MENU ADJUSTMENT (Adjust 4:3MODE / 16:9MODE respectively)
Measuring
Item
instruments
VERTICAL Signal
SIZ E gener ator
adjustment
Remote
(50Hz)
control unit
Very clos e
Screen
size
Very clos e
VERTICAL Signal
POSITION gener ator
adjustment
(50Hz) Remote
control unit
VERTICAL Signal
gener ator
S-CORREC-
TION
Remote
adjustment
control unit
(50Hz)
18
Test point Ad justment part
VSIZ
Picture
size
100%
VPOS
A
B
VSCO
No. 52057
Description
1. Receive a PAL B/G cross-hatch pattern of vertical frequenc y
50Hz.
2. Enter SERVICE MENU.
3. Press the GREEN then enter the GEOMETRY MENU.
4. Select VSIZ (Vertic al size) with the FUNCTION ( / ) key.
5. Adjust VSIZ with the FUNCTION (
horizontal black lines on both the upper and lower part of the
pattern bec ome very clos e to the upper and lower horizontal
sides of picture size and nearly about to dis appear.
6. Check and readjust VSIZ item if the adjustment becomes
improper after some other geometric adjustments are done.
1. Receive a PAL B/G circ le pattern signal of vertic al frequenc y
50Hz.
2. Enter GEOMETRY MENU.
3. Select VPOS (Vertical position) with the FUNCTION ( / )
key.
4. Adjust VPOS with the FUNCTION ( / ) key until the circle
pattern is vertically centered.(A=B)
5. Check and readjust VPOS item if the adjustment bec omes
improper after some other geometric adjustments are done.
1. Receive a PAL B/G cross-hatch pattern signal of vertical
frequency 50Hz.
2. Enter GEOMETRY MENU.
3. Select VSCO (Vertical s-c orrec tion) with the FUNCTION
( / ) key.
4. Adjust VSCO with the FUNCTION ( / ) key until the vertical
length of the c enter squarer of the cross-hatch pattern
becomes equal to upper and lower part squares of the cross-
hatch pattern.
5. Check and readjust VSCO item if the adjustment bec omes
improper after some other geometric adjustments are done.
/ ) key until the