JVC AV-21BF11ENS Service Manual page 17

Measuring
Item
instruments
VERTICAL Signal
SIZ E OFFSET gener ator
adjustment
(60Hz) Remote
control unit
Very clos e
Screen
size
Very clos e
VERTICAL Signal
POSITION gener ator
OFFSET
adjustment Remote
(60Hz) control unit
HORIZONTAL Signal
POSITION
generator
OFFSET
adjustment
Remote
(60Hz)
control unit
E
Test point Ad justment part
VSOF
Picture
size
100%
VPOF
C
D
HPOF
F
No. 52055
Description
1. Receive a NTSC-M cross-hatch pattern of vertic al frequency
60Hz.
2. Enter SERVICE MENU.
3. Select VSOF(Vertical size) with the FUNCTION ( / ) key.
4. Adjust VSOF with the FUNCTION (
horizontal blac k lines on both the upper and lower part of the
pattern become very clos e to the upper and lower horizontal
sides of picture size and nearly about to disappear.
5. Check and readjust VSOF item if the adjustment becomes
improper after some other geometric adjustments are done.
1. Receive a NTSC-M circ le pattern of vertical frequency 60Hz.
2. Enter SERVICE MENU.
3. Select VPOF (Vertical position) with the FUNCTION ( / )
key.
4. Adjust VPOF with the FUNCTION ( / ) key until the picturer
is vertically centered.(C=D)
5. Check and readjust v ertical position item if the adjustment
becomes improper after some other geometric adjustments
are done.
1. Input a NTSC-M c ircle pattern signal of vertical frequency
60Hz.
2. Enter SERVICE MENU.
3. Select HPOF (Horiz ontal position) 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.
AV-21BF11ENS
AV-21BF11EES
AV-21BF11EPS
AV-21BF11EJS
/ ) key until the
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