Akai MPC3000 Service Manual page 2

SAFETY INSTRUCTIONS
PRECAUTIONS DURING SERVICING
1
.
Parts
identified
by
the
A
(*)
symbol are
critical
for
safety.
Replace
them
only with the parts
number
specified.
2. In
addition to safety,
other parts
and assemblies are
specified for
conformance
with
such regulations as
those applying
to
spurious
radiation.
These
must
also
be
replaced only
with the specified
replacements.
Examples:
RF
converters, tuner
units,
antenna
selector
switches,
RF
cables, noise blocking capacitors,
noise blocking
filters,
etc.
3.
Use
specified internal wiring.
Note
especially:
1)
Wires covered
with
PVC
tubing
2)
Double insulated wires
3)
High voltage leads
4.
Use
specified insulating materials for
hazardous
live
parts.
Note
especially:
1
)
Insulation
Tape
2)
PVC
tubing
3)
Spacers
(insulating barriers)
4) Insulation
sheets
for transistors
5) Plastic
screws
for fixing
micro switches
5.
When
replacing
AC
primary
side
components
(transformers,
power
cords,
noise blocking capacitors,
etc.),
wrap
the
ends
of
the wires securely
around
the
terminals before soldering.
6.
Make
sure that
wires
do
not
contact heat producing
parts (heat sinks,
oxide metal
film resistors, fusible
resistors, etc.).
7.
Check
that
replaced wires
do
not
contact
sharp edged
or
pointed
parts.
8.
Also
check
areas surrounding
repaired
locations.
9.
Make
sure that
foreign objects (screws, solder droplets,
etc.)
do
not
remain
inside the
set.
SAFETY
CtfECK
AFTER
SERVICING
After servicing,
make measurements
of
leakage-current
or
resistance
in
order
to
determine
that
exposed
parts
are acceptably insulated from
the supply
circuit.
The
leakage-current
measurement should be done
be-
tween accessible metal parts
(such as chassis, ground
terminal,
microphone
jacks, signal input/output
connectors,
etc.)
and
the earth
ground through a
resistor of
1500
ohms
paralleled with a 0.15
pF
capacitor,
under the
unit's
normal working conditions.
The
leakage-current should
be
less
than
0.5
mA
rms AC.
The
resistance
measurement should be done between
accessible
exposed metal
parts
and power
cord plug
prongs with the
power
switch
(rf
included) "ON". The
resistance
should be
more than
2.2
M
ohms.
PRECAUTION
FOR
LITHIUM
BATTERY
The
lithium
battery
may
explode
when
heareo
excessively.
[OBSERVE THE
FOLLOWING
WHEN
REPLACING]
•
Replace
with
the
same make
and
type only.
•
Use
soldering
iron in
"recommended
way'
only.
•
Place
battery in
correct
polarity.
•
Do not short the terminals.
•
Do
not charde battery.
•
Do
not
dispose
of battery
in fire.
[DANGER]
[RECOMMENDED
WAY]
INFORMATIONS
SYMBOLS FOR PRIMARY
DESTINATION
Unit destinations
are indicated with
letters
as
shown
below.
Symbols
Principal
Destinations
A
U.S.A
B U.K
C Canada
E
Europe
(except U.K)
Japan
Lsj
Australia
m
Germany
m
Universal
Area
ra
Custom
version