AKA AC-400 User manual

AKAi SERVICE fflADUAL
0 0
AC-400
co
0
AC-405K
MINI COMPONENT SYSTEM
AC-400/AC-405K
SR-400

CONTENTS
[AC-400 / AC-4051<]
SAFETY INSTRUCTIONS .............................................................................................................................. 4
INFORMATIONS .................................................................................................................................................... 5
SPECIFICATIONS ................................................................................................................................................. 6
I. DISASSEMBLY ................................................................................................................................................ 8
II. PRINCIPAL PARTS LOCATIONS .................................................................................................... 9
III. REPLACEMENT OF PRINCIPAL MECHANICAL PARTS ...................................... 11
IV. ADJUSTMENT ............................................................................................................................................. 15
V. PARTS LIST .................................................................................................................................................... 19
VI. WIRING DIAGRAM .................................................................................................................................. 33
VII. BLOCK DIAGRAM ................................................................................................................................. 34
VIII. SCHEMATIC DIAGRAM .................................................................................................................. 38
IX. PCB LAYOUT ................................................................................................................................................ 45
X. INFORMATION OF ICs Ml-COM ................................................................................................ 51
ABBREVIATIONS .............................................................................................................................................. 60
[SR-400]
SPECIFICATIONS ............................................................................................................................................. 64
SCHEMATIC DIAGRAM .............................................................................................................................. 64
PARTS LIST ............................................................................................................................................................. 65
3

SAFETY INSTRUCTIONS
PRECAUTIONS DURING SERVICING
1. Parts indentified by the A (*)symbol parts are critical for
safety. Replace them only with parts whose numbers are
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 replace-
ments.
Examples:RF converters, tuner units, antenna selection
switches, RF cables, noise-blocking capacitor~, 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) Insulating Tape
2) PVC tubing
3) Spacers(insulating barriers)
4) Insulating sheets for transistors
5) Plastic screws for fixing micro switches
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.
~
6. Make sure that wires do not contact heat generating
parts {heat sinks, oxide metal film resistors, fusible resis-
tors, etc.).
7. Check if replaced wires do not contact sharply edged or
pointed parts.
8. Also check areas surrounding repaired parts.
9. 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 for recy- ~
cling as well as small accumulators (recharge- TI ~\)
able batteries), mini-batteries (cells) and starter 'O <:;:,
batteries should not be thrown into the garbage can.
Please leave them at an appropriate depot. All other house-
hold batteries can be thrown out with the household waste.
SAFETY CHECK AFTER SERVICING
After servicing, make measurements of leakage-current or
resistance in order to check if exposed parts are accept-
ably
insulated from the supply circuit.
The leakage-current measurement should be done between
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 0.15µF capacitor, under the unit's normal working
condition.
4
The leakage-current should be less than 0.5mA r ms AC.
The resistance measurement should be done between
accesible exposed metal parts and power cord plug prongs
with the power switch "ON"(if included). The resistance
should be more than 2.2Mohms.
PRECAUTIONS IN REPAIRING
When repairing or adjusting the unit, please note the follow-
ing points.
1. Do not put excessive pressure on the mechanical part
(operation part), including the pick-up block, as extremely
high mechanical precision is required in these parts.
2. When the base is removed for repair or adjustment,
make sure that there are no metal objects between the
P.C board or the mecha parts and the base.
3. The Micro-Computer and the CD signal processing ICs
may be damaged by static electricity or leakage from a
soldering iron during repairing. While soldering, please
take the precautions against leakage as in the illustra-
tion.
, GND
4. Do not loosen any screws in the pick-up block.
Please refer to NOTE when replacing the pick up block.
5. To avoid hazardous invisible Laser Radiation, DO NOT
look at the Laser Beam (Objective lens) directly.
6. On models for some countries, laser warning labels are
affixed on and inside of the unit, as shown below.
For your safety,
read these labels carefully before
repairing or adjusting the unit.
CAUTION
The use of controls or adjustments or the performance of
procedures other than those specified herein may result in
hazardous radiation.
[EUROPE, SCANDINAVIA, UK and AUSTRALIA]
CLASS 1 LASER PRODUCT
KLASSE 1 LASER PRDDUKT
LUOKAN 1 LASER LAITE
KLASS 1 LASER APPARAT
Label affixed on the rear panel of the unit
CAUTION: INVJSllk.ElASERIWMTIONWHEN°"=N
ANO tNnAl.00(S DEFEATED AVOID EXPOIUM: TO 8EAM
AOVARSEL : USYNUG LASERSTRAUNO VED .....
HINl KA.A SIKKEAHED6AFWIYOEAI: EA UOE I# fUNKT10N
uNDG,i UD&IIIETTELSE FOA STAAI..ING
VARO : AVATTAESSA JA SUOJAL.UklTUS OHfTET-
TAESSA Olfl ALTTNNA NAKYMATTOIMlLE I.MIERSATE~
LYLEE
ALA KATSO SATEESEEN 1
VARNING ;()SYNI.IO LASERSTAAl.MNG MAR DENNA
DEL AA 0PPNAO OCH SPAAAEN AA UAKOPf'lAO
BETANClA EJ STRALEN'
Label affixed on the CD MECHA chassis

INFORMATIONS
SYMBOLS FOR PRIMARY DESTINATION
Alphabet indicates the destination of the units as listed
below.
Symbol Prinncipal Destination
[Kl USA
[[] UK
rn
Europe(except, UK)
rn
Australia
[y]
Germany
[[]
Universal
IY*I
Custom version
VOLTAGE CONVERSION ( IY] [Y] Model only)
Before connecting the power cord, set the VOLTAGE
SELECTOR located on the rear panel of the AC-400/AC-
405K so that the correct voltage for your area
is indicated.
220-230V 240V
110V
[U, Y]
5

SPECIFICATIONS
[AMPLIFIER Section]
Power output ....................................................................................................................................... 30W +30W(6 ohm, 1 KHz, 10% THD, EIAJ)
25W + 25W(6 ohm, 1 KHz, 1% THD, DIN)
Total harmonic distortion ........................................................................................................................................................ 0.05%(-10dB for RMS)
Input sensitivity
AUX ..................................................................................................................................................................................................... 400mV/47K ohms
S/N ratio
AUX ............................................................................................................................................................................................................................... 70d8
Channel separation ........................................................................................................................................................................................................ 55d8
[Deck Section]
Track system ........................................................................................................................................................................... 4 track, 2 channel system
Frequency response ......................................................................................................................................... 100-12,SOOHz ± 3dB(Normal tape)
100-12,SOOHz ± 3dB(Cr02 tape)
Wow & Flutter ................................................................................................................................................................................................... 0.2%(WRMS)
S/N ratio(CCIR/ARM) ..................................................................................................................................................... 62dB(DOLBY ON, Cr02 tape)
52dB(DOLBY OFF, Normal tape)
Total harmonic distortion .............................................................................................................................................. 1.0%(Normal tape, at 400Hz)
Channel separation ........................................................................................................................................................................................................ 35d8
[General]
Power requirement
AC-400'
E/V ..................................................................................................................................................................................................... AC 220-230V, 50Hz
B ................................................................................................................................................................................................................. AC 230V, 50Hz
S ................................................................................................................................................................................................................. AC 240\/, 50Hz
U, Y .......................................................................................................................................... AC 110/127 /220-230/240V, 50/60Hz convertible
AC-405K
U, Y .......................................................................................................................................... AC 110/127 /220-230/240V, 50/60Hz convertible
Dimension ........................................................................................................................................................................... 270(W) x 280(H) x 371 (D)mm
Weight ................................................................................................................................................................................................................................... 9Kg
Power consumption ....................................................................................................................................................................................................... 88W
6

[Tuner Section]
Frequency range
FM ....................................................................................................................................................................................... 87 .5-108MHz(50KHz step)
MW ........................................................................................................................................................................................ 531-1602KHz(9KHz step)
[E/V /S/B/U5/Y1 /Y3/Y1]
530-161 0KHz(1 0KHz step)
[Ua/Y2/Y4]
LW ............................................................................................................................................................................................. 144-288KHz(1 KHz step)
SW ........................................................................................................................................................................................... 3.8-12.5MHz(5KHz step)
Sensitivity
FM ............................................................................................................................................................................ 3µV (IHF, THO 3%) [EXCEPT V]
5µV (IHF, THO 3%) M
MW ............................................................................................................................................................................................ 700µV (IHF, THO 10%)
LW ............................................................................................................................................................................................ 1500µV (IHF, THO 10%)
SW ................................................................................................................................................................................................ 30µV (IHF, THO 10%)
S/N ratio(IHF A NETWORK)
FM ..................................................................................................................................................................................................................... Mono:70dB
Stereo:65dB
MW ................................................................................................................................................................................................................................. 40dB
LW .................................................................................................................................................................................................................................. 30dB
SW ................................................................................................................................................................................................................................. 30dB
Total H!lrrnonic distortion(at 1 KHz)
FM ..................................................................................................................................................................................................................... Mono:0.8%
Stereo:1.0%
MW .................................................................................................................................................................................................................................. 1.0%
LW .................................................................................................................................................................................................................................. 1.0%
SW .................................................................................................................................................................................................................................. 2.0%
Stereo separation ......................................................................................................................................................................................... 35dB(at 1 KHz)
[Graphic Equlizer]
Center frequency .................................................................................................................... 63Hz/160Hz/400Hz/1 KHz/2.5KHz/6.3KHz/16KHz
Control range ............................................................................................................................................................................................. ±8dB(2dB step)
[CD Section]
Pick up system ................................................................................................................................................................................................. 3 Beam laser
Sampling frequency ................................................................................................................................................................................................. 44.1 KHz
Error correction system ............................................................................................................................................. Cross interleave reed solomon
Number of channels ........................................................................................................................................................................................... 2 Channel
Frequency response .................................................................................................................................................................................... 20Hz~20KHz
S/N ratio ............................................................................................................................................................................................................................. 90dB
Wow & flutter ............................................................................................................................................................................. Below measurable limits
Total harmonic distortion ...................................................................................................................................................................... 0.07% (at 1 KHz)
Channel separation ..................................................................................................................................................................................... 85dB (at 1 KHz)
Dynamic range ............................................................................................................................................................................................. 85dB (at 1 KHz)
* For improvement purposes, specifications and design are subject to change without notice.
7

I. DISASSEMBLY
1. REMOVAL OF COVER-TOP
FRONT-PANEL
--
----
----
---
CHASSIS- BACK
~
.
@-- -- Ulll!!P-!l
-~
0 0
~ ~~ ~~~~~11~~ ~ ~~~~~
-----
~~ij~~~~ 0 ~
----
0-
0o 111111,llll~lllu111111i
~~~~~~~~
-• - 0
~~~~~~~II
------
----
----
(1
0 0
----
-------
.,,/
-------
-----
.,,/
..,
_,/
"
---- ----
---
/
..,
"'
COVER-TOP
2. REMOVAL OF CD MECHA & CASSETTE DECK MAINTENANCE
MECHA-CD
CHASSIS-BACK
CHASSIS-CD
FRONT-PANEL
CHASSIS- BOTTOM
MECHA-DECK
8

II. PRINCIPAL PARTS LOCATIONS
PCB-KARAOKE
PCB-PHONE
PCB-KEY
PCB-CD
PCB-CDG
MECHA-CD
PCB-FRONT
CHASSIS- BACK
COVER-TOP
CHASSIS-CD
PCB-VOLUME
PCB-MIC
PCB-LENS
KNOB-VOLUME
9

COVER-RADIATOR
~
RADIATOR-L
/
PCB-VOLTAGE/SELECT /
\
vv
I PCB-PO'w'ER l
PO'w'ER-TRANS
MECHA-DECK
CHASSIS-BOTTOM
\
1/ ~
I l
I I
10