JVC AV-34WP84 /ZA Service Manual page 39

4.7 ADJUSTMENT PROCEDURE
4.7.1 CHECK ITEM
Measuring
Item
instrument
B1 POWER Signal
SUPPLY generator
check
DC voltmeter
4.7.2 FOCUS
Measuring
Item
instrument
FOCUS Signal
generator
Remote
control unit
Vertical line
4.7.3 HORIZONTAL FREQUENCY
Measuring
Item
instrument
H. FREQUENCY Signal
generator
Remote
control unit
Test point Adjustment part
S1 connector
pin 5 (TP-91)
& pin 1(TP-E)
[DEF &
POWER PWB]
Test point Adjustment part
FOCUS 1 VR
FOCUS 2 VR
[FBT]
Make fine and
sharp as possible.
Horizontal line
Fig.1
Test point Adjustment part
[1.PICTURE/SOUND]
D15: H. FREQ.
D18: (Not display)
(DEF RST OUT)
Description
(1) Receive the black and white signal (color off).
(2) Connect the DC voltmeter to the pin 5 (TP-91) and
pin 1(TP-E) of S1 connector.
(3) Confirm that the voltage is DC183V±2.5V.
Description
(1) Receive the crosshatch signal.
(2) Select the FULL mode.
(3) While watching the screen, adjust the FOCUS 1 VR
(Fig.2) to make the horizontal lines as fine and sharp
as possible. (Fig.1)
(4) Then adjust the FOCUS 2 VR (Fig.2) to make the
vertical lines as fine and sharp as possible. (Fig.1)
(5) Make sure that when the screen is darkened, the
lines remain in good focus.
F2
FOCUS
F1
SCREEN
Fig.2
Description
(1) Receive any broadcast.
(2) Select the FULL mode.
(3) Select 1.PICTURE/SOUND from the SERVICE
MENU.
(4) Preset the value from 0 to 1 for the < D18 > (DEF
RST OUT).
(5) While observing the screen, adjust the < D15 >(H.
FREQ.) so that
synchronization is obtained.
(6) Press [MUTING] key to memorize the set value.
(7) Select the REGULAR mode.
(8) Memorize the same value on REGULAR mode as
will.
(9) After adjustment, preset the value from 1 to 0 for the
< D18 >.
(10) Press the [MUTING] key to memorize the set value.
FOCUS 2 VR
FOCUS 1 VR
an optimum horizontal
(No.52170)1-39