Sharp R-771(W)N - Page 17

PROCEDURE
LETTER
sO
COMPONENT
TEST
G
BLOWN
EUSE
5A
(F1)
TEST PROCEDURES (CONT'D)
CARRY OUT 3D CHECKS.
Ifthe
fuse
15A
is
blown,
there
could
be
a
shorts
or
grounds
in
elecirical
parts
or
wire
harness.
Check
them
and
replace
the
defective
parts
or
repair
the
wire
harness.
CARRY OUT 4R CHECKS.
CAUTION:
Only
replace
fuse
15A
with
the
correct
value
replacement.
H
BLOWN
FUSE
F8A
(F2)
———=-—_>—_——
a
CARRY OUT 3D CHECKS.
lfthe
fuse
F8A
(F3)
is
blown,
there
could
be
a
short
in
the‘asymmetric
rectifier
or
there
is
a
ground
in
wire
harness.
Ashort
inthe
asymmetric
rectifier
may
be
occurred
due
to
short
or
ground
inH.V.
rectifier,
magneiron,
high
voltage
transformer
or
H.V.
wire.
Check
them
and
replace
the
defective
parts
or
repair
the wire harness.
CARRY
OUT
4R
CHECKS.
CAUTION:
Only
replace
fuse
with
the
correct
value
replacement.
i
NOISE
FILTER
TES
9)
RTEST
N
WHT
CARRY OUT 3D CHECKS.
Disconnect
the
leads
from
the
terminals
of
noise
filter.
L
Using
an
ohmmeter,
check
between
the
terminals
as
o—-=-0
described in the following table.
RED
MEASURING
POINTS
INDICATION
OF
OHMMETER
Between
N
and
L
Approx.
680
kQ
Between
terminal
N
and
WHITE
|
Shortcircuit
ST
Between
terminal
L
and
RED
|
Shortcircuit
SSS=*S
if
incorrect
readings
are
absorbed,
replace
the
noise
filter
unit.
CARRY OUT 4R CHECKS.
|
J
MOTOR
WINDING
TEST
CARRY
OUT
3D
CHECKS.
Disconnect
the
leads
from
the
motor.
Usin
terminals
as
described
in
the
table
below.
Table: Resistance of Motor
Turntable motor
If
incorrect
readings
are
obtained,
replace
the
motor.
CARRY
OUT
4R
CHECKS.
Resistance
Approximately 320 2
Approximately 15.5 kQ
R-771 - 17
g
an
ohmmeter,
check
the
resistance
between
the
two
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