Akai AM A202 Service Manual

Page 1

555 AKAI senuma mnnunl

For Service Manuals Contact
MAURITHON TECHNICAL SERVICES
8 Cherry Tree Rd. Chinnor
Oxon OX9 4QY
TeI:- 01844-35I694 Faxt- 01844-352554
Emails enquiries@mun'1ron.mm

MODEL AM-A402

STEREO INTEGRATED AMPLIFIER

MODEL AM-A102
MODEL AM-A202
MODEL AM-A302
MODEL AM-A402

Page 2

SAFETY INSTRUCTIONS

PRECAUTIONS DURING SERVICING

1. Parts identified by the A symbol pans 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 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 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.

estate

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

IN FORMATION

7. Check that replaced wires do not contact sharp
edged or pointed parts.

8. Also check areas surrounding repaired locations.

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

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 M ohms, but for equipment
with external antenna terminals (tuner, receiver, etc.)
and is intended for or E, specified insulation re-
sistance should be headphone jacks. line-in-out jacks etc.
more than 2.2 M ohms (ground terminals, microphone
jacks).

For Service Manuals Content
MAURITRON TECHNICAL SERVICES
8 Cherry Tree Rd, Chinnor
Oxon OX9 4QY
Tel:- Ohm-351694 Faxy 01844-352554
Email:- mamaes@mauritrotwo.ilt

SYMBOLS FOR PRIMARY DESTINATION

Alphabet indicates the destination of the units as listed
below.

Symbols Principal Destinations
USA
UK
Canada
@ Europe (except UK)
Japan
E Australia
W. Germany only
Universal Area
Custom version

SERVICE MANUAL

VOLTAGE CONVERSION (El Model only)

Before connecting the power cord, turn the VOLTAGE
SELECTOR located on the rear panel with a screwdriver
so that the correct voltage is indicated.

129V IIOV
240V, 4 .220V

VOLTAGE
SELECTOR

Page 8

V. ADJUSTMENT

5-1. LEVEL METER SENSITIVITY ADJUST-
MENT (AM-A302, AM-A402 Model only)

This adjustment is not necessary if the level meter shows
no levels with no signal input.

However if the level meter shows some levels in spite of
no signal input, adjust VR8 to the point where the first
LED (D1) is extinguished. V

SWl

.A/

ICI

VR5 VRS

VR8 mil:

l
LEVEL METER vnr

Z SENS

Fig. 5-1 Adjustment point ofCONTROL PCB

For Service Manuals Contact
MAURITRON TECHNICAL SERVICES
8 Cherry Tree Rd, Chinnor
Oxon OX9 4QY
Tel:- 01844-351894 Fax} 01844352554
Email:- anqmnwnnummnmm

SERVICE MANUAL

Page 19

ABBREVIATIONS (AMPLIFIER)

ABBREVIATIONS EXPLANATION
AC Alternating Current
AMP AMPlifier
CD Compact Disc
DC Direct Current
GND GrouND
MC Moving Coil
MM Moving Magnet
PCB Printed Circuit Board
REC RECord
SW SWitch
V.DISC Video DISC
VR Variable Resistance
VTR Video Tape Recorder

For Service Manuals Con
MAURITHON TECHNICN. SEHthaégS
8 Cherry Tree Rd. Chinnor
Oxon OX9 4QY
Tel:- 01844-351894 Fax; 01844652554
Email:- enquicimmamvonmm