JVC AV21BT7ENB
Service Manual

AV21BT7ENS / AV21BT7ENB AV21BT7EPS / AV21BT7EPB AV21BT7EES / AV21BT7EEB

Item 4:3 HORIZONTAL SHIFT Adjustment

Measuring instruments Signal generator

Test point

Adjustment part Adjust 12 ( 4 : 3 ) Adjust 23 ( 16 : 9 ) 1. 2. 3. 4.

Description Receive a RED test pattern. Set < 4 : 3 aspect mode >. Select < ADJUST 12 > from SERVICE MENU. 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.

VERTICAL SLOPE Adjustment

Signal generator

Adjust 13 ( 4 : 3 ) Adjust 24 ( 16 : 9 )

1. 2. 3. 4.

Receive a cross-hatch signal. Set < 4 : 3 aspect mode >. Select < ADJUST 13 > from SERVICE MENU. 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. Check and readjust VERTICAL SLOPE item if the adjustment becomes improper after some other geometric adjustments are done. 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.

VERTICAL AMPLITUDE Adjustment

Signal generator

Adjust 14 ( 4 : 3 ) Adjust 25 ( 16 : 9 )

1. 2. 3. 4.

Receive a PAL test pattern signal. Set < 4 : 3 aspect mode >. Select < ADJUST 14 > from SERVICE MENU. 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. Check and readjust VERTICAL AMPLITUDE item if the adjustment becomes improper after some other geometric adjustments are done. 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.

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No. 51878