JVC AV-29L6SU Service Manual page 20

4.8.3 DEFLECTION CIRCUIT
This TV has two kinds of aspect modes ( 1. REGULAR, 2. 16 : 9).
120Hz-i is a signal that is output to a screen when a 60Hz signal is input to a television set. It is an interlace-scanned picture of 120Hz.
100Hz-i is a signal that is output to a screen when a 50Hz signal is input to a television set. It is an interlace-scanned picture of 100Hz.
There are two kinds of adjustment modes depending upon the vertical frequency of the signal for adjustment input to the
TV (100Hz/120Hz). Because there are two kinds of aspect modes for each vertical frequency, there are many adjustment
modes as same as the aspect modes. However, the adjustment value of other aspect modes of 100Hz (by the offset function)
is automatically corrected, if it adjusts in the REGULAR mode of 100Hz, even if it doesn't adjust in all modes. Each adjust-
ment value of 120Hz is automatically set based on the adjustment value in each aspect mode by 100Hz. Please confirm the
adjustment in each vertical frequency and each aspect mode after completing the adjustment in the REGULAR mode of
100Hz. And if it is not best respectively, adjust it.
• The adjustment using the remote control unit is made on the basis of the initial setting values. The setting values which adjust the
screen to the optimum condition can be different from the initial setting values.
Measuring
Item
instrument
V. POSITION Signal
generator
Remote
control unit
V. SIZE Signal
generator
Remote
control unit
Screen
size
93%
1-20 (No.YA366)
Test point Adjustment part
[4. DEF]
1. V-SHIFT
(A)
(B)
[4. DEF]
2.V-SIZE
Picture
size
100%
Description
(1) Receive a circle pattern signal of vertical frequency
50Hz (PAL).
(2) Set the ZOOM mode to REGULAR.
(3) Select 4. DEF from the SERVICE MODE.
(4) Select < 1.V-SHIFT >.
(5) Adjust to become A = B.
(6) Check the adjustment value above in other zoom
mode changed by the [Red] key. If it is a wrong
adjustment, re-adjust in REGULAR mode and adjust
by < 1. V-SHIFT >.
(7) Press the [OK] key to memorize the set values.
(1) Receive the PAL cross hatch signal.
(2) Set the ZOOM mode to REGULAR.
(3) Select 4. DEF from the SERVICE MODE.
(4) Select < 2.V-SIZE >.
(5) Set the initial setting value of < 2.V-SIZE >.
(6) Adjust to make sure that the vertical screen size of
the picture size is 93%.
(7) Press the [OK] key to memorize the set values.
(8) Input the NTSC cross hatch signal from the EXT
terminal.
(9) Follow the same step 2 to 7 as in PAL signal, re-
adjust by < 2.V-SIZE > if it is a wrong adjustment.