Akai AAV 1200 Service Manual

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CONTENTS

SAFETY INSTRUCTIONS ................................... ....... 3
DISASSEMBLY ................................... ................. ....4
pmNC'PAL PARTS LOCATION ................................................... 5
FIPDISPLAY ..... .. .............. ...... . ........ ..... 5
PIN CONNECTION ...... .. .............................................. 7
lCPINFUNCTlON~-~'~»--~'~~ ........................................ . ...5
MEASUREMENTSANDADJUSTMENTS ------- ~16
WIRING DIAGRAM ...................... ................................. 19
BLOCKDIAGRAM ............ l ................................................ 21
SCHEMATlCDlAGRAMH....H ............ .......................... 23
PRINTEDCIRCUITBOARDS ....... ........ . .. ..33
EXPLODEDVIEW ......... , .......... . . ............. ............ 41
PARTS LIST ........ . ............. . ..................................... ..43

SAFETY INSTRUCTIONS

PRECAUTIONS DURING SERVICING

1 Parts identifide by the A (nlsymbol parts are critical
for safety. Replace only with 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 specifide
replacements.

Examples :RF converters, tuner units, antenna
selectswitches, 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 voltageleads

O. Use specified insulating materials for hazardous live

parts. Note especially:

1) insulation Tape

2) PVC tubing

3) Spacerslinsulating barriers)

4) insulation sheets tor transistors

5) Plastic screws for fixing micro switches

5. When replacing AC primary side components
(transformers, power cords, noise blocking capaci-
tors, etc.), wrap ends of wires securely about the
terminals beiore soldering.

assist?"

a. Make sure that wires to do not contact heat produc-
ing parts (heat sinks, oxide metal film resistors,
lusible resistors, etc.l.

7. Check that replaced wires do not contact sharp

edged or painted pans.

. Also check areas surrounding repaired locations.

. Make sure that foreign objects (screws, solder

droplets, etc.) do not remain inside the set.

MAKE YOUR CONTRIBUTION TO PROTECT
THE ENVIRONMENT

Used batteries with the ISO symbol (or recycling

as well as small accumulators (rechargeable
batteries), mini»batteries (cells) and starter bat-

teries should not be thrown into the garbage

can

Please leave them at an appropriate depot. All other house
hold batteries can be thrown out withthe household waste.

SAFETY CHECK AFTER SERVICING

After servicing, make measurements oi 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
between accessible metal parts (such as chassis.
ground terminal, microphone lacks, signal input/output
connectors, etc.) and the earth ground through a
resistor DI 1500 ohms paralleled with a 0.15 n? capaci-
tor, under the unit's normal working conditions.

moo

The leakage-current should be less than 0.5mA rms AC.
The resistance measurement should he done between
accessible exposed metal parts and power cord plug
prongs with the power switch (if included) 'ON'. The
resistance should be more than 2.2M Ohms.

PRECAUHONS IN REPAIRING

When repairing or adjusting the unit, please note the

following points.

1. Do not put excessive pressure on the mechanical
part [operation pert), including the pick-up block, as
extremely high mechanical precision is required in
these pans.

2. When the base is removed for repair adjustment.
make sure that there are no metal obiecrs in the nar-
row gap between the P. (2. board or the mecha parts
and the base

3. The MicrorComputer and the CD signal processing
le can be damaged by static electricity or leakage
from a soldering iron during repairing. While sol-
dering, please take the precautions against leakage
as in the illustration.

GND

4. Do not loosen any screws in the pick-up block.
When handing the pick-up block, please refer to the
points to NOTE when replacing the pick-up block.

5. Keep safety for hazardous invisible Laser Radiation,
DO NOT watch the Laser Beam (Objective lens)
directly.

6. Models for some countries, laser warning labels are
affixed on the unit and inside of the unit, as shown
below. Read it carefully for your safety, when
repairing or adjusting the unit.

INFORMATION

SYMBOLS FOR PRIMARY DESTINATION
Primary destination of units are indicated with the ini-
lowing alphabet.

Symbols Principal Destinations

UK

Europe (except UK)

Custom version