NTENTS
Si
CO
Page
SAFETY
PRECAUTION............0ccc
ce
eeaecuaes
2
LOCATION
OF
CONTROLS............2
000
eeeueuce
3,4
PROTECTION
CIRCUITRY
...........ecccccenecaces
4
BEFORE
REPAIR
AND
ADJUSTMENT..............06.
4
SELECTING
THE
CORRECT
SPEAKER
IMPEDANCE
......
4
DISASSEMBLY
INSTRUCTIONS..............2e0000.
5.6
TERMINAL
GUIDE
OF
TRANSISTORS,
DIODES
ANDIC’S..
6
CIRCUIT
BOARDS
AND
WIRING
CONNECTION
DIAGRAM
.
7~9
Mi
SAFETY
PRECAUTION
Before
servicing,
unplug
the
power
cord
to
prevent
an
electric
shock.
OE
Oo
I
1.
2.
3.
Note:
.
When
replacing
parts,
use
only
manufacturer’s
recommended
Page
DESCRIPTION
OF
MUTING/RELAY
DRIVE
IC........
10
BLOCK
DIAGRAM
.............000
2
ce
ceceveuees
11
CHANGE
IN
POWER
SUPPLY.................002.
12
SCHEMATIC
DIAGRAM
.............00c0eceeeae
13
~
16
RESISTORS
&
CAPACITORS.............0000cees
17
REPLACEMENT
PARTS
LIST............cc0cc00ee
18
EXPLODED
VIEWS..........000
cee
eeeaaneueas
19
components
for
safety.
Check
the
condition
of
the
power
cord.
Replace
if
wear
or
damage
is
evident.
After
servicing,
be
sure
to
restore
the
lead
dress,
insulation
barriers,
insulation
papers,
shields,
etc.
Before
returning
the
serviced
equipment
to
the
customer,
prevent
the
customer
from
being
exposed
to
a
shock
hazard.
INSULATION
RESISTANCE
TEST
be
sure
to
make
the
following
insulation
resistance
test
to
Unplug
the
power
cord
and:short
the
two
prongs
of
the
plug
with
a
jumper
wire.
Turn
on
the
power
switch.
Measure
the
resistance
value
with
ohmmeter
between
the
ju
screwheads
antenna,
control
shafts,
handle
brackets,
etc.
E
mpered
AC
plug
and
each
exposed
metal
cabinet
part,
such
as
quipment
with
antenna
terminals
should
read
between
3MQ2Q
and
5.2MQ
to
all
exposed
parts.
(Fig.
A)
Equipment
without
antenna
terminals
should
read
approximately
infinity
to
all
exposed
parts.
(Fig.
B)
Antenna
terminal
Exposed
metal
part
Ohmmeter
(Fig.
A)
Resistance
=
3M2—5.2MQ
Some
exposed
parts
may
be
isolated
from
the
chassis
by
design.
These
will
read
infinity.
Exposed
metal
part
Ohmmeter
(Fig.
B)
Resistance
=
Approx
oo
4.
If
the
measurement
is
outside
the
specified
limits,
there
is
a
possibility
of
a
shock
hazard.
The
equipment
should
be
repaired
and
rechecked
before
it
is
returned
to
the
customer.
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