Sharp mz-1d04 Service Manual page 5

3.
ADJUSTMENTS
*
Adjustments need conection of the microcomputer.
*
Although adjustments had been done to the best condi-
tions before the machine left the factory, follow the
• +8 power suply circuit adjustment
(1) Make sure that the AC supply
is
within a range of
rocal voltage ±5%.
(2) Adjust the 11.5V adjusting potentiometer so that the
DC voltage becomes 11.5V between the emitter of
Q701 and GND.
• Horizontal synchronization adjustment
(I) Control the microcomputer so that
all
of data display
periods should become white (horizontal 36.088tLs,
vertical 12.81Ims).
(2) Manipulate the horizontal synchronization adjusting
coil so that the image should appear on the center.
(3) Repeat power on and off for several times and check
that no image blur occurs.
• Horizontal amplitude adjustment
(1) Control the microcomputer so that all of data display
periods should become white (horizontal 36.088tLs,
vertical12.811ms).
(2) Manipulate the core of the horizontal amplitude
adjusting coil so that the amplitude at the center of the
screen should become 213mm.
NOTE: Clockwise turn of the horizontal amplitude adjust-
ing coil core makes amplifiation wider.
5
procedures described next, in case there is a need of adjus
ment due to shift in adjustment or after parts replacemen
• Vertical amplitude adjustment
(1) Control the microcomputer so that all of data disph
periods should become white (horizontal 36.08&,.
vertical 12.81lms).
(2) Manipulate the vertical amplitude adjusuting potenti
meter so that the amplitude of the image at the cent
should become 160mm.
• Focus adjustment
(1) Operate the microcomputer to generate charactel
(2) Manipulate the focus adjusting potentiometer
that an optimum of focus should be obtained.
• Sub-brightness adjustment
(1) Operate the microcomputer to generate characte]
(2) Make it adjusted so that no raster should be visit
even if the brightness volume
is
set to its maximUl
• Vertical linearity adjustment
(1) Operate the microcomputer to gener1rte characte
(2) Manipulate the vertical linearity potentiometer
that the vertical linearity should set to the best.