Deflection Circuit - JVC AV-1406FE Service Manual

4.8.4 DEFLECTION CIRCUIT

• There are 2 modes of adjustment (setting value) 50Hz mode and 60Hz mode, depending upon the kind of signals (vertical frequency
50Hz / 60Hz).
• When adjusted in 50Hz mode and 60Hz mode will be automatically set.
The setting (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.
• Make sure that the adjustment is properly done on the screen of 60Hz mode.
NOTE:
• Adjust to make both 50Hz & 60Hz are the same v. size and fine straight line.
• When adjust again, adjust 50Hz mode first.
• When adjust in 60Hz mode, only 60Hz mode is adjust.
Measuring
Item
instrument
V. HEIGHT / Signal
V. POSITION generator
Remote
control unit
Screen
size
H. POSITION Signal
generator
Remote
control unit
(A)
V.LINEARITY / Signal
V.S-CURVE generator
Remote
control unit
1-20 (No.YA370)
Test point Adjustment part
[3. DEF]
1. VER. POSITION
3. VER. HEIGHT
Picture
size
100%
Fig.1
[3. DEF]
2. HOR. POSITION
(B)
Fig.2
[3. DEF]
4. VER. LIN.
5. VER. SCURVE
Top
Centre
Bottom
Fig.3
Description
(1) Receive a crosshatch signal.
(2) Select 3. DEF from the SERVICE MENU.
(3) Select < 1. VER. POSITION >.
(4) Set the initial setting value of < 1. VER. POSITION >.
(5) Adjust < 1. VER. POSITION > to agree the vertical
centre with display centre.
(6) Select <3. VER. HEIGHT >.
(7) Set the initial setting value of <3. VER. HEIGHT >.
(8) Adjust <3. VER. HEIGHT > to make the vertical
screen size 92% of the picture size.
(1) Receive a circle pattern signal.
(2) Select 3. DEF from the SERVICE MENU.
(3) Select < 2. HOR. POSITION >.
(4) Set the initial setting value of < 2. HOR. POSITION >.
(5) Adjust <2.HOR. POSITION> to be equal the width of
(A) and (B) as shown in Fig.2.
• When the vertical linearity has been deteriorated
remarkably, perform the following steps.
(1) Receive a crosshatch signal.
(2) Select 3. DEF from the SERVICE MENU.
(3) Select < 4. VER. LIN. >.
(4) Set the initial setting value of < 4. VER. LIN. >.
(5) Select < 5. VER. SCURVE >.
(6) Set the initial setting value of < 5. VER. SCURVE >.
(7) Adjust < 4. VER. LIN. > and < 5. VER. SCURVE >
so that the spaces of each line as shown in Fig.3 on
TOP, CENTRE and BOTTOM become uniform.