JVC AV28BT7ENS Service Manual page 14

AV28BT7ENS / AV28BT7ENB
AV28BT7EES / AV28BT7EEB
AV28BT7EPS / AV28BT7EPB
Measuring
Item
instruments
VERTICAL Signal
ZOOM generator
Adjustment
VERTICAL Signal
SCROLL generator
Adjustment
4 : 3 Signal
generator
HORIZONTAL
SHIFT
Adjustment
VERTICAL Signal
SLOPE generator
Adjustment
VERTICAL Signal
generator
AMPLITUDE
Adjustment
14
Test point Adjustment part
Adjust 10 ( 4 : 3 )
Adjust 21 ( 16 : 9 )
Adjust 11 ( 4 : 3 )
Adjust 22 ( 16 : 9 )
Adjust 12 ( 4 : 3 )
Adjust 23 ( 16 : 9 )
Adjust 13 ( 4 : 3 )
Adjust 24 ( 16 : 9 )
Adjust 14 ( 4 : 3 )
Adjust 25 ( 16 : 9 )
No. 51883
Description
1. Receive a PAL circle test pattern.
2. Set < 4 : 3 aspect mode > .
3. Select < ADJUST 10 > from SERVICE MENU.
4. Change vertical zoom till you see the upper and olwer limit
of the circle as close to the upper and lower limit of the
picture tube as possible.
5. Set < 16 : 9 aspect mode > .
6. Adjusts with the step which is the same above from 3 to 4
about the 16 : 9 aspect mode, too.
1. Receive a PAL circle test pattern.
2. Set < 4 : 3 aspect mode > .
3. Select < ADJUST 11 > from SERVICE MENU.
4. Change vertical scroll till you see the circle exactly un the
middle of the screen.
5. Set < 16 : 9 aspect mode > .
6. Adjusts with the step which is the same above from 3 to 4
about the 16 : 9 aspect mode, too.
1. Receive a RED PURITY test pattern.
2. Set < 4 : 3 aspect mode > .
3. Select < ADJUST 12 > from SERVICE MENU.
4. Change horizontal shift till the picture is horizontally
centered. Check whether this adjustment is correct after
completing Service Mode Adjustment.
5. Set < 16 : 9 aspect mode > .
6. Adjusts with the step which is the same above from 3 to 4
about the 16 : 9 aspect mode, too.
1. Receive a CROSS-HATCH signal.
2. Set < 4 : 3 aspect mode > .
3. Select < ADJUST 13 > from SERVICE MENU.
4. Change vertical slope till the size of squares on both the
upper and lower part of test pattern become equal to the
squares laying on the vertical centre of the test pattern.
5. Check and readjust VERTICAL SLOPE item if the
adjustment becomes improper after some other geometric
adjustments are done.
6. Set < 16 : 9 aspect mode > .
7. Adjusts with the step which is the same above from 3 to 5
about the 16 : 9 aspect mode, too.
1. Receive a PAL test pattern signal.
2. Set < 4 : 3 aspect mode > .
3. Select < ADJUST 14 > from SERVICE MENU.
4. Change vertical slope till horizontal black lines on both the
upper and lower part of the test pattern become very close
to the upper and lower horizontal sides of picture tube and
nearly about to disappear.
5. Check and readjust VERTICAL AMPLITUDE item if the
adjustment becomes improper after some other geometric
adjustments are done.
6. Set < 16 : 9 aspect mode > .
7. Adjusts with the step which is the same above from 3 to 5
about the 16 : 9 aspect mode, too.