JVC AV-48P776/H, Service Manual, Page: 46 / 154

(No.YA318)1-45
AUTO
CONVERGENCE
(SUPER FOCUS)
setting Signal
generator
Remote
control unit
[ 6.CONVER A ]
[ 7.CONVER B ] AUTO CONVERGENCE (SUPER FOCUS) PRESET
AUTO CONVERGENCE PRESET is a work in which you
store (memorize) an optimum reference CONVERGENCE
in SUPER FOCUS operation in the unit. At the factory, this
PRESET has been carried out and memorized in the unit
after adjusting CONVERGENCE. However, PRESET will
be invalid when the servicing is carried out in accordance
with the following conditions. In this case, it is necessary
to execute PRESET again.
CONDITIONS THAT RESET IS EXECUTED
(1) When the data is memorized with the [MUTING]
key on SERVICE MENU 6.CONVER A regardless
of the change of data (CPA, CCA, CDA and CBA).
(2) When the data is memorized with the [MUTING]
key on SERVICE MENU 7.CONVER B regardless
of CONVERGENCE adjustment.
NOTE FOR PRESET
• It is required that you must execute PRESET when
CONVERGENCE has been properly adjusted
because the CONVERGENCE will be a reference to
SUPER FOCUS.
• When SENSOR around the SCREEN is replaced to
new one, it is also necessary to execute PRESET. In
this case, perform RESET according to the steps 1 or
2, then execute PRESET again.
HOW TO EXECUTE PRESET
When executing SUPER FOCUS with AUTO on
CONVERGENCE of the USER MENU or SUPER
FOCUS button on the FRONT CONTROL, you can
execute PRESET automatically when RESET is
applied. In this case, a dimmed block will be displayed
in the center of the screen. (When SUPER FOCUS is
operated, a crossshape pattern will be displayed in the
center of the screen.)
NOTE :
When a unicolor block in the center of the screen
flashes on and off at PRESET or SUPER FOCUS, it
means that the input from SENSOR is not normal
(input level is too low). In this case, make sure that
SENSOR receives enough light from the backside.
• Not receives enough light
It is necessary to readjust RASTER CENTER, H/V
SIZE and CONVERGENCE.
• Receives enough light
Failure of the sensor or defects of detection route
(circuit).
Item
Measuring
instrument
Test point Adjustment part Description
PRESET IS OPERATING
SUPER FOCUS IS OPERATING
SENSOR IS NOT NORMAL
FRONT CONTROL
SUPER FOCUS button
MENU
POWER
CHANNEL VOLUME SUPER
FOCUS
OPERATE
- + - +
INPUT-4
S-VIDEO VIDEO AUDIO
R L/MONO
OVER
S
UPER
F
OCUS
S
UPER
F
OCUS
S
UPER
F
OCUS