Sharp VC-780E - Page 25

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ADJUSTMENT
OF
ELECTRICAL
CIRCUITRY
Prior to the adjustment:
In
most
cases,
necessity
for
electrical
circuits
will
arise
from
replacement
of
mechanical
parts
including
the
video
head.
Before
starting
adjustment
of
electrical
circuits,
check
that
mechanical
operation
of
the
equipment
is
complete
(the
mechanism
are
adjusted
completely).
@ Instruments
® Colour monitor TV
@ DC regulated power supply
eVTVM
® Oscilloscope
® Audio generator
lf the equipment fails electrically, locate a defect
or defects first of all using instruments. Then
repair or replace parts and make adjustment by
the procedures described below.
When required instrumetns are not available, do
not move controls indiscriminately.
@ Colour bar generator
® Alignment tape
® Frequency counter
® Blank video tape(VHS)
ADJUSTMENT
OF
MAIN
(SERVO,
SYSTEM
CONTROL
)
CIRCUIT
® Test points layout
Ea acs
RYSsT
Pe SV
adJ
Figure 2-1. System Control, Servo PWB
25
VC-780E
VC-790ET