Akai AM M830 Service Manual

Page 2

* SAFETY INSTRUCTIONS

PRECAUTIONS DURING SERVICING

1, Parts indentified by the I (*) symbol are critical for
safety. Replace only with pans number specified.

2. In addition to safety, other pans and assemblies are
specified for conformance with such regulations as
those applying to spurious radiation.

These must also be replaced only with specified re-
placements.

Examples: RF converters, tuner units, antenna selec-
tor 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 microswitch (especially in
turntable)

5. When replacing AC primary side components (trans-
formers, power Cords, noise blocking capacitors, etc),
wrap ends of wires securely about the terminals before
soldering.

assist

* INFORMATION

6, Observe that wires do not contact heat producing pans
(heatsinks, oxide metal film resistors, fusible resistors.
etc).

7. Check that replaced wires do not contact sharp edged

or pointed parts.

.Also check areas surrounding repaired locations.

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

on

SAFETY CHECK AFTER SERVICING

After servicing, make measurements of leakage-current
or resistance in order to determine that exposed pans 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 connec-
tors, etc,) and the earth ground through a resister of 1500
ohms paralleled with a 015 pF capacitor, under the unit's
normal working conditions. The leakagecurrent should
be less than 0.5 mA rrns AC.

The resistance measurement should be done between
accessible exposed metal pans and power cord plug
prongs with the power switch (if included) ON". The
resistance should be more than 2.2 Mohms.

MAKE YOUR CONTRIBUTION TO PRO-

TECT THE ENVIRONMENT

Used batteries with the ISO symbol for re-
cycling as well as small accumulators (re-
chargeable batteries), mini-batteries (cells)
and staner batteries should not be thrown
into the garbage can.

Please leave them at an appropriate depot. All other
household batteries can be thrown out with the household
waste.

122%

SYMBOLS FOR PRIMARY DESTINATION
Alphabet indicates the destination of the units as listed
below.

Symbols principal Destinations
UK

Europe (except UK)
Australia

Germany

Universal Area

Custom version

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VOLTAGE CONVERSION (@model only)

Before connecting the power cord, set the VOLTAGE SE-
LECTOR located on the rear panel so that the correct
voltage for your area is indicated

120V 110V VOLTAGE
~ SELECTOR

240V 220V

SERVICE MANUAL

PRECAUTION BEFORE / AFTER REPAIRING THE

UNIT

[ABOUT THE POWER SUPPLY]

Power supply of the AM-MBSO/M830 is controlled by the

tuner. Therefore when repair of the AM-MGSO/MBSO is

necessary, repair should be made together with the tuner.

To repair the AM-M630/M830 without tuner, use the fol-

lowing procedure.

1) While pushing the GE REC button, press the POWER
button to turn the power of the AM-MGSO/MBSO on.

2) To turn off the power of the AM-M630/M830, the AC
power cord must be disconnected.