Akai AP M77 Service Manual

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Extracted text from Akai AP M77 Service Manual (Ocr-read)

Page 2

SAFETY INSTRUCTIONS

SAFETY CHECK AFTER SERVICING

Conﬁrm the speciﬁed insulation resistance between power cord plug prongs and externally exposed parts of the set is
greater than 10 Mohms, but for equipment with external antenna terminals (tuner, receiver, etc.) and is intended for

E] or A , speciﬁed insulation resistance should be more than 2.2 Mohms (ground terminals, microphone jacks,
1eadphone jacks. line-in-out jacks etc.)

PRECAUTIONS DURING SERVICING

Parts identiﬁed by the A symbol parts are critical for safety.

Replace only with parts number speciﬁed.

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 speciﬁed replacements.

Examples: RF converters, tuner units, antenna selector switches, RF cables, noise blocking capacitors, noise
blocking filters, etc.

Use speciﬁed internal wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

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 microswitch (especially in turntable)

When replacing AC primary side components (transformers, power cords, noise blocking capacitors, etc.), wrap
ends of wires securely about the terminals before soldering.

D D

Observe that wires do not contact heat producing parts (heatsinks, oxide metal ﬁlm resistors, fusible resistors, etc.).
Check that replaced wires do not contact sharp edged or pointed parts.

Also check areas surrounding repaired locations.

Use care that foreign objects (screws, solder droplets, etc.) do not remain inside the set.

VOLTAGE CONVERSION

Each machine is preset at the factory according to
its destination, but some machines can be set to
110V-120V or 220V-240V as required. If your
machines voltage can be converted:

Before connecting the power cord or assembling the
platter, turn the Voltage Selector located on the top of SETTING VOLTAGE
the cabinet with a screwdriver until the correct voltage is
indicated. Models for Japan, USA, Europe, UK and
Australia are not equipped with this facility. /
NOTE: Cycle conversion is unnecessary since this

AC220-240V AC110-120V

model employs DC motors.