Akai AM M800 Service Manual

Page 2

* SAFETY INSTRUCTIONS

PRECAUTIONS DURING SERVICING

1. Parts identified by the [b (*) symbol 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 re-
placements.

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

pans. 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.

errata?

* INFORMATION

6. Observe that wires do not contact heat producing parts
(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.

no

SAFETY CHECK 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 resister of 1500
ohms paralleled with a 015 pF capacitor, under the units
normal working conditions. The leakage-current should be
less than 0.5 mA rrns AC.

The resistance measurement should be done between ac-
cessible exposed metal parts and power cord plug prongs
with the power switch (it included) ON". The resistance
should be more than 2.2 Mohms.

SYMBOLS FOR PRIMARY DESTINATION

Alphabet indicates the destination of the units as listed
below.

Symbols Principal Destinations
UK
[E Europe (except UK)
Australia
W. Germany only
E Universal Area
Custom version

VOLTAGE CONVERSION (El 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.

SERVICE MANUAL

PRECAUTION BEFORE/AFTER REPAIRING
THE UNIT

[ABOUT THE POWER SUPPLY]

Power supply of the AM-MGOO/MBUO is controlled by the
tuner. Therefore when repair of the AM-M600/M800 is
necessary, repair should be made together with the tuner.
To repair the AM-M600/M800 without tuner, use the fol-
lowing procedure.

1) While pushing the GE REC button, press the POWER
button to turn the power of the AMvMGDO/MSOO on.

2) To turn off the power of the AM-M600/M800, the AC
power cord must be disconnected.

Page 5

III. PARTS LIST

ATTENTION

1. When placing an order for parts, he sure to list Part No., Model No. and the description at eachpart.
Otherwise, the non-delivery of the part or the delivery at a wrong part may result. _

2 Please make sure that Part No. is correct when ordering.
If not, a part different from the one you ordered may be delivered

3. Since the parts shown In Parts List of Preliminary Service Manual may have been the subject of changes,
please use this Parts List for all future reference.

HOW TO USE THIS PARTS LIST

1 This Parts List lists those parts which are considered necessary for repairs. Other common parts, such as resis-
tors and capacitors, are listed in the Common List for Service Parts from which these parts should be selected
and stocked.

2. The Recommended Spare Parts List shows those parts in the Parts List which are considered particularly import-
ant for service.

3. Parts not shown in the Parts List and Common List for Service Parts" will not in principle be supplied.

4. How to read the Parts List.

a) Mechanism Block D) PC Board

2. HEAD BASE BLOCK 6. MAIN PC BOARD

Hef.No. Part No. Description RetNo. Part No. Description
BH-T2023A320A HEAD BASE BLOCK |C1 El-324536 IC HD1404SBP
HP-H2206A010A HEAD R/P PRA-BFU C lCZ EI-336801 IC MBSB4I-564M
28477876 PAN20X038TL CMT C1A EC-338399 C MMY V 223M 250AC [U585]
28-536488 BID2OXOBSTL CMT C1 B EC-350949 C MMY V 223M ZSODC [J]
Q-402895 SP CS ANGLE ADJUST C1C EC-338397 C MMY V 223M 125AC [CA]

X1 2-318384 OSC X'TAL NC-I BC

i

Symbols for primary destination --I

[A] : AAL (USA) [S] ; SAA (Australia)

[B] : BEAB (England) [U] : U/T (Universa Area)
[C] : CSA (Canada)

[E] :CEE (Europe) [V] : VDE (W. Germany)
[J] :JPN (Janan) [Y] : Custom Version

L SP (Service Parts) Classification

This number corresponds with the individ
ual parts index number in that figure.

->-Iu1Aon-«

, SP (Service Parts) Classification

I- These reference symbols correspond
with component symbols in the
Schematic Diagrams.
The available PC Board Blocks are listed separately.
5. When Part No. is known, Parts index at end of Parts List can be used to locate where that part is shown in Parts List
by its Reference No.|isted at right of Part No.

WARNING

A: (*) INDICATES SAFETY CRITICAL COMPONENTS. FOR CONTINUED SAFETY, REPLACE SAFETY
CRITICAL COMPONENTS ONLY WITH MANUFACTURES RECOMMENDED PARTS.

AVERTISSEMENT
A (*) IL INDIQUE LES COMPOSANTS CBITIQUES DE sEcunn'E. POUR MAINTENIR LE DEan DE

sEcURITEDE LAPPAREIL, NE REMPLACER QUE DES PIECES RECOMMANDEES PAR LE
FABRICANT.

PARTS LIST