JVC AV-21RM4SE Service Manual page 20

AV-25BT6ENS
AV-25BT6ENB
Measuring
Item
instruments
VERTICAL Signal
POSITION gener ator
OFFSET
Ad justment Remote
(60Hz) control unit
HORIZONTAL Signal
generator
POSITION
OFFSET
Remote
adjustment
control unit
(60Hz)
E
HORIZONTAL Signal
TRAPEZOID
generator
OFFSET
Remote
adjustment
control unit
(60Hz)
Screen
Vertical
Center
16
Test point Ad justment part
VPOF
C
D
HPOF
F
HT OF
P allalel
1. Receive a NTSC-M circ le pattern of vertical frequency 60Hz.
2. Enter SERVICE MENU.
3. Select VPOF with the FUNCTION ( / ) key.
4. Adjust VPOF with the FUNCTION (
picture is vertically centered.(C=D)
5. Check and readjust vertical position item if the adjustment
becomes improper after some other geometric adjustments
are done.
1. Receive a NTSC-M circ le pattern signal of vertical frequency
60Hz.
2. Enter SERVICE MENU.
3. Select HPOF with the FUNCTION ( / ) key.
4. Adjust HPOF with the FUNCTION ( / ) key until the circle
pattern is horizontally centered.(E=F)
5. Check and readjust a horizontal position item if the adjustment
becomes improper after some other geometric adjustments
are done.
1. Receive a NTSC-M cross-hatch pattern signal of vertic al
frequency 60Hz.
2. Enter SERVICE MENU.
3. Select HTOF with the FUNCTION ( / ) key.
4. Adjust HTOF with the FUNCTION (
lengths of the upper side and lower side of the closs-hatch
pattern become equal.
5. Check and readjus t HTOF item if the adjus tment bec omes
improper after some other geometric adjustments are done.
No. 52056
Description
/ ) key until the
/ ) key until both