JVC AV-28BT8ENS Service Manual page 19

Measuring
Item
instrument
VERTICAL Signal
CORNER gener ator
CORRECTION
adjustment Remote
(50Hz) control unit
HORIZONTAL Signal
SIZ E gener ator
adjustment
(50Hz) Remote
control unit
Picture size 100%
Screen size
Very clos e
HORIZONTAL Signal
POSITION gener ator
adjustment
(50Hz) Remote
control unit
C
Test point Ad justment part
VCCO
HSIZ
Very clos e
HPOS
D
No. 52057
AV-28BT8ENS / AV-28BT8ENB / AV-28BT80EN
AV-28BT8EPS / AV-28BT8EPB / AV-28BT80EP
AV-28BT8EES / AV-28BT8EEB/ AV-28BS88EN
Description
1. Receive a PAL B/G cross-hatch pattern signal of vertical
frequency 50Hz.
2. Enter GEOMETRY MENU.
3. Select VCCO (Vertical s-correction) with the FUNCTION
( / ) key.
4. Adjust VCCO with the FUNCTION ( / ) key until the vertical
length of the upper and lower part squares of the cross -hatch
pattern become equal to each other.
5. Check and readjust VCCO item if the adjustment becomes
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 HSIZ (Horiz ontal size) with the FUNCTION ( / ) key.
4. Adjust HSIZ with the FUNCTION ( / ) key until the vertical
blac k lines on both the left and right part of the cross-hatc h
pattern become very clos e to the left and right horizontal sides
of picture tube and nearly about to disappear.
1. Receive a PAL B/G circle pattern signal of vertical frequency
50Hz.
2. Enter GEOMETRY MENU.
3. Select HPOS with the FUNCTION ( / ) key.
4. Adjust HPOS with the FUNCTION ( / ) key until the circle
pattern is horizontally centered.(C=D)
5. Check and readjust HPOS item if the adjustment becomes
improper after some other geometric adjustments are done.
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