JVC AV21D71NT Repair Manual

AV-21D41
AV-21D71
DEFLECTION CIRCUIT ADJUSTMENT
z There are 2 modes of adjustment (setting value) ------ ź 50Hz mode and   60Hz mode ----- depending upon the kind of signals
(vertical frequency 50Hz / 60Hz).
z When adjusted in mode ź , 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.
Measuring
ItemTest pointAdjustment partDescription
instrument
AdjustmentSignal1.VER. POSITION1. Input a circle pattern signal.
generator
ofV.HEIGHT3.VER. HEIGHT2. Select 3. DEF. from SERVICE MENU.
&3. Select 1. VER. POSITION with the MENU U/� key.
Remote
V.POSITIONcontrol unit4. Set the initial setting value with the MENU - / + key.
5. As shown in Fig.2, adjust V and V? to be equal with the MENU -
SUB MENU 3. DEF
/ + key.
6. Input a crosshatch signal.
DEFPAL7. Select 3. V. HEIGHT with the MENU U/� key.§§§
1. VER. POSITION
8. Set the initial setting value with the MENU - / + key.
9. As shown in Fig.1, adjust VER. HEIGHT and make the vertical
screen size 92% of the picture size with the MENU - / + keys of
50Hz
remote control unit.
:/ SELECT
- / + : OPERATEDISP : EXIT
Screen size
ScreenPicture
sizesize
92%100%
Picture size 100%
Fig.1
AdjustmentSignal2.HOR. POSITION10. Input a circle pattern signal.
generator
ofHOR.11. Select 2. HOR POSITION with the MENU U/� key.
POSITION12. Set the initial setting value of 2. HOR. POSITION with the
Remote
MENU - / + key.
control unit
13. As shown in Fig.2, adjust 2. HOR. POSITION to make H=H"
with the MENU - / + key.
HH"
V
V'
Fig.2
26No. 51925