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4. TEST PROCEDURES
cOMPONENT
ONTROL
IRCUIT
BOARD
rOUCH
KEY
30ARD
CHECKOUT
PROCEDURE
Measure the
voltage:
Between test
points
TP-1,
TP-2
or
TP-3
and
ground
between
TP-4,
and
TP-5.
(See
control
circuit
board
on page
9 )
NOTE
– Proceed
with
the
check
of the step-down
transformer,
to
see
if
any
one
of the
measured
values
is
different
from
the
specified
values.
Measure
the
resistance
between
terminals,
of
FPC
connector
after
removing
it from
SIO1.
(Figure
2).
NOTE
-
— When
reconnecting
the
FPC
connector,
make
sure
the
holes
on
the
connector
are
propedy
inserted
in
hooks
of
the
plastic
fastener
in S101.
MATRIX
CIRCUIT
FOR
TOUCH
KEY BOARD
FPC CONNECTOR
RESULT
I
Test
TP-2
TP-3
TP-41
TP-1
point
TP-5
–
5V
–15V
–25V
2.OV
Voltage
DC
Dc
DC
AC
1--1
I
I
I
When
When
not
Resistance
touched
touched
value
Less than
More
then
lK Ohms
1 MEG
Ohm
When
checking
"START"
key, connect
ohm-
meter
as illustration
below
Q
Ohm-meter
1
Top
b;
B
t
_-—
- --
.-—
D
—-
1
--
--
I
I
—--
I
—--
0'
-—-
11
--
—.Z
Al
A2
A3
)
A4
A5
c1
C2
C3 )
C4
C5
Figure 2
TERMINALS
OF FPC CONNECTOR
.."
–3–
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