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Technics SX-PR700

Technics SX-PR700
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ABOUT
THE
SELF-DIAGNOSTIC
FUNCTION
This
modet
has
some
self-diagnostic
capabilities.
When
set
to
the
self-diagnostic
mode,
operation
of
various
components
can
be
verified
by
following
the
procedures
in
the
chart
below.
TEST
MODE
RAM
(IC8),
ROM
(IC2-5,
7)
|
1.Connect
the
CHECKING
DEVICE
(refer
to
page
I-17)
to
CN13
on the
check
MAIN
P.C.B.,
and
turn
on
the
CHECKING
DEVICE
switch.
2:Turn
on
the
power
switch.
When
the
power
switch
is
turned
on,
the
LED
of
the
CHECKING
DEVICE
flashes
8
times.
The
first
4
flashes
are
for
the
RAM
check,
and
the
latter
4
flashes
are
for
the
ROM
check.
The
order
of
the
LED
flashes
correspond
to
the
respective
|C
numbers
as
shown
below.
If
an
IC
is
defective,
the
corresponding
flash
time
is
longer.
9
RAM
ROM
|
|
Examples
1.
RAM
OK,
ROM
OK
@---@---@»
@---]
---en
@---@---e»w
3.
RAM
(IC8)
defective,
ROM
OK
1
®
2.
RAM
OK,
ROM
(IC7)
defective
®
a
t
>
@---@---@-=
oO
“J
IC8
NOTE:
@
indicates
short
flash
time
w=
indicates
long
flash
time
CPU
(IC1)
check
1.Connect
the
CHECKING
DEVICE
to
CN13
on
the
MAIN
P.C.B.
(The
Checking
Device
switch
should
be
off).
2.Press
and
hold
the
two
D
keys
shown
below,
and
then
turn
on
the
|
WRIT
UA
pa-2]
D
keys
When
the
power
switch
is
turned
on,
the
LED
of
the
CHECKING
DEVICE
flashes
4
times.
The
order
of
the
LED
flashes
corresponds
to
the
CPU
(IC)
on the
respective
P.C.B.s
as
shown
below.
If
an
IC
is
defective,
the
corresponding
flash
time
is
longer.
3
U—»
@---]
---@
1.
CPL
(IC1),
CPR
(IC1)
OK
2.
CPL
(!C1)
defective
3.
CPR
(IC1)
defective
—+
J
---@---@
=
NOTE
:
@
indicates
short
flash
time
m=
indicates
long
flash
time

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