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TESTING ELECTRICAL
SECTION
VI.
CHECKING
THE
PARTS CONNECTED WITH THE
POWER
SUPPLY
1. lnitial
live test.
Make sure
the
power
switch
is
turned
off.
Plug
the
power
cord
into
the
machine
first
then, connect
to
the
main
supply.
Switch
on and check
the following.
A.
The power
supply
pilot
lamp
is
lit.
(Next
to
row counter).
B.
The buzzer
makes a
sound.
C. The
ready lamp
in the pattern
case
is
lit.
D. The
mark
sensor (Card reader)
is
in the
left
hand
position.
lf
not, it
will
be
turned
back
to
the
left
position.
Note:
This can
only
be
seen
with
the cover removed.
E.
The card feeding
dial
ratchets and
will
not
feed
the
card.
F.
The
number
"888"
should not
flash
on
and
off
in the
display.
2.
Action
required
for fault
symptoms
detailed
in
1.
2-1.
Pilot
lamp
does
not
light.
Check and repair
by
referring
to
Fig.
15.
2-2.
Buzzer
does
not
make
a
sound.
Short-circuit
the
anode
side (D205)
and
chassis
by
using
the test
lead.
(Fis.
16).
Connect
the
end
of
the test
lead
to
the
anode
side
of
the diode (D205)
and
the other
end
to
the
metal parts
of
the
machine
body.
lf
the
buzzer
makes
a
sound,
it
is
working
correctly.
There
are some
defects
on
the control
circuit for
the
buzzer
which
is installed on
the
main
P.C.B.
Replace
the
pattern
case
whole
unit
or the main
P.C.B, assembly
with
a
new
one.
2-3. The ready lamp
does
not
light.
1.
Set
the
tester
to
the DCV.
10
range,
connect
the
red
terminal
of it to
the
pin
of the
red
cord
and
the
black terminal
to the
pin
of
the
black
cord.
Check
the
voltage between
the
red
cord
and
the black cord
of
the connector
sl.
lf it
is
+5V
t
5%,
there
are some
defects on
the main
P.C.B.
Replace
the
pattern
case
whole
unit
or the main
P.C.B. assembly
with
a
new
one.
2.
lt it
is
not
+5V
t
5%
(not
0V),
replace
the
power
supply
board
with
a
new
one.
3.
lf it
is
0V,
check
the
fuse
(F2O2l
which
is installed
on the
power supply
board. (Fig.
17).
lf
the
fuse
is
not
broken, check
the
voltage
between
the
two
red cords
of
'
the connector
S9
of the
power
transformer.
Set
the
tester
to
the ACV.
30
range,
and connect
the terminal
of it to
the
pins
of
the
red
cord of the connector
59.
lf
the
voltage
between
them
is
AC.
10.6V
t
1O%,
there
are some
defects on
the
power
supply
board.
Replace
the
power
supply
board.
lf
not, there
are some
defects
on the
power
transformer.
Replace
the
power
transformer
with
a
new
one.
4.
lf
it
is
0V
and fuse
(F202)
is
broken,
replace
the fuse
lF2O2\
with
a
new
one and repair
the
cause
of
the short-circuit.
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4A
Cathode
/E
D205
a,ole
To
chassis
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D2os h
Fis.
16
-10_
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