Akai AT-K02 User manual

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AT-K02
AM-U0Q2
FM AM STEREO TUNER
uoveLA T-KO2
STEREO INTEGRATED AMPLFIER
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ALSO
APPLICABLE
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PANEL
MODEL
SECTION
1
MODEL
AT-K02
SERVICE
MANUAL
SECTION
2
MODEL
AM-U02
SERVICE
MANUAL
SECTION
3.
PARTS
LIST
..................----2455
31
SECTION
4
SCHEMATIC
DIAGRAM................-
45

SECTION 1
MODEL AT-KO2
SERVICE MANUAL
TABLE OF CONTENTS
L.. SPECHNICAL DATA. sacred. 2d iy tmospe hati ee Wig he alate ad date OteeGss 4
i, “DISMANTLING: OFUNIT 0 sh-1 0d 4 ga ga-eutide wv nseaten de binec eae Aa Eun bo UNS ee 5
Hs. “CONTROLS x ss. otter ees bane weds weenie eee Beaten wabee CRAG eat wees Gay 6
TV. “PRINCIPALPARTS LOCATION’ 24324 oo awies Hoo hh talel Gots cotatileys ohare fe ees 7
We “VOLTAGE CONVERSION | .iscit:o2t3 25.406 Saree uae hi Soroka he Sea aes an eae and 8
Vi. STUNER ADJUSTMENT: sc.02.55 eae oe bos rhage e kh Sadao ee ewes oa Rae Rb 9
1c EM TONER SECTION ADIUSTMENT 34.54 oo wate soe aw day wad eae at po dadtawernees 0
2: AM TUNER: SECTION ADJUSTMENT $224.65 $cc 4000 ¥a-e Sire E9044 pee bey Peed ees 1
Vil. TUNING CORD THREADING 3.60225 aoe opi es awed ei wae OL aS Wes ke ee 2
VIII. CLASSIFICATION OF VARIOUS P.C BOARDS .........0 00000 cee ce cee een eens 2
1. P.C BOARD TITLES AND IDENTIFICATION NUMBERS ............ 000000 e eee euee 2
2. COMPOSITION OF VARIOUSP.C BOARDS ........... 0.00 cee cee eee eee ences 3
For basic adjustments, measuring methods, and operating principles, refer to GENERAL TECHNICAL
MANUAL.

1. TECHNICAL DATA
FM TUNER SECTION
FREQUENCY RANGE | |__87.5 MHz to 108 MHz _
SENSITIVITY (IHF) : 19 yV oan =
CAPTURE RATIO _ ; 1.2 dB ack
SELECTIVITY (IHF) - ____._ More than 65 dB _ er 8 en
IMAGE REJECTION More than60dB(98MHz) ee
IF REJECTION _ _ More than 85dB(98MHz) a
SPURIOUS REJECTION ' More than 85 dB (98 MHz)
AM SUPPRESSION me _ 60 dB -
SIGNAL TO NOISE RATIO ! 73 dB
HARMONIC DISTORTION. = =MONO | Less than 0.09% (100% modulation)
= a _ STEREO _|_Less than 0.12% (100% modulation)
TUNING INDICATOR ; 3 LEDs
SIGNAL INDICATOR "5 LEDs i
MUTING - — \_ Switchable to ON-OFF - a
STEREO SEPARATION » More than 52 dB (1 kHz) 7 _
SUB CARRIER SUPPRESSION More than 60 dB
OUTPUT VOLTAGE ~ "Fixed 1 V (100% modulation) pa
ANTENNA INPUT IMPEDANCE __ 300 ohms balanced, 75 ohms unbalanced -
AM TUNER SECTION
FREQUENCY RANGE | 520 kHz to 1,605 kHz
SENSITIVITY (IHF) | _150 pV/m (bar antenna), 10 pV (external antenna) a
SELECTIVITY (IHF) __ More than 30 dB 7 ae
IMAGE REJECTION "More than 55 dB (1,000 kHz) 7
IF REJECTION _ - More than 40 dB a -
SIGNAL TO NOISE RATIO More than 55 dB >
OUTPUT VOLTAGE «300 mV (30% modulation)
ANTENNA a Built-in ferrite barantenna epee
MISCELLANEOUS
SEMICONDUCTORS Transistors: 26, Diodes: 13, LED: 6, ICs: 4
POWER REQUIREMENTS ' 120 V, 60 Hz for U.S.A. and Canada
220 V, 50 Hz for Europe except UK
240 V, 50 Hz for UK and Australia
a 110/220/240 V, 50/60 Hz internally switchable for the other countries
POWER CONSUMPTION — 20W 7 ; ;
DIMENSIONS ; 440 (W) x 78 (H) x 340 (D) mm (17.3 x 3.1 x 13.4) inches
WEIGHT _ 4.9 kg (10.8 Ibs) _
* For improvement purposes, specifications and design are subject to change without notice.

il. DISMANTLING OF UNIT
In case of trouble, etc. necessitating dismantling, please dismantle in the order shown in the Photographs. Reassemble
in reverse order.
WN
SCREWS
UPPER COVER
i FRONT PANEL
SCREWS

il. CONTROLS
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Fig. | Controls
1. POWER SWITCH 9. FM SWITCH
2. FMDIAL SCALE 10. AM SWITCH
3. AM DIAL SCALE 11. TUNING KNOB
4. SIGNAL STRENGTH INDICATOR 12. FM LOC SWITCH
5.
FM
CENTER
TUNING
INDICATOR
13.
FM
and
AM
ANTENNA
TERMINALS
6. FM STEREO LAMP 14. AM FERRITE BAR ANTENNA
7. FM SERVO LAMP 15. OUTPUT JACKS (Left and Right)
8.
FM
MODE
SWITCH
16.
POWER
CORD
(Some
models
have
power
cord
inlets
instead.)

iv.
PRINCIPAL
PARTS
LOCATION
a nn eee
FM CENTER
TUNING FM SERVO SELECTOR
INDICATOR INDICATOR SWITCH TUNING
D3toD5 De swl SHAFT
POWER SIGNAL FM STEREO FM MOOE
SWITCH STRENGTH INDICATOR SWITCH
SW 90l INDICATOR Dé SwW2
DI
Fig. 2 Front View
FUSE :
HOLDER(A)
BAR
ANTENNA
ANT9OI
FRONTEND
ATT
PC
BOARD
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SWITCH
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TUNER P.C BOARD
ATK-2001A
Fig. 3 Top View

V. VOLTAGE CONVERSION
110V AREAS: FI 400mA
220V AREAS: F2 200mA
240V AREAS : F3 200mA
POWER TRANS
ATKO2T-70
Models for Canada, USA, Europe, UK and Australia are
not equipped with this facility.
Each
machine
is
preset
at
the
factory
according
to
destination but some machines can be set to 110V,
220V or 240V as required.
If
voltage
change
is
necessary,
this
can
be
accomplished
as follows.
1) Disconnect AC Power Cord.
2) Loosen holding screws and remove upper case.
3) Remove existing line voltage fuse in proper fuse
holder, explicitly following instructions printed
on the rear panel.
Fig. 4 Fuse Holder (A) (U/T Model)

TUNER ADJUSTMENT
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Fig.

FREQUENCY
COUNTER
C\ C\ O
«gl W a INPUT
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— AC VOLTMETE
pMpees TERMINATION PAD 76KHz TP d aa acd es
a & | input
a Oe ans e ‘a 300 OHMS) REC OUTPUT
o INPUT 0 B O ANTENNA h\
OUTPUT
TERMINAL
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AC
VOLT
METE
REC OUTPUT o
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AT—KO2 ¥ | INPUT
FM STEREO DISTORTION
GENERATOR METER Lchd Roh
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1. FM TUNER SECTION ADJUSTMENT (Refer to Figs. 5, 6)
Fig. 6 Instrument Connections
aaa = a cence mi cay
Step Adjustment Item __ Adjustment Point _ Result, _Remarks |
Front End Tl Maximum Noise Selector | 2 PM, and Mode |
] : MONO. Tune in noise only
IF Coil (Front End) Level
without broadcast interference.
Funihe jnidicaior Center indication ; ; |
2 Centering T3-a Sr rani LEDs 98 MHz, 60 dB (mono) input.
Distortion 7 : Less than 0.09% 98 Mee: 60 ves (mono) i puke
3 T3-b : : Less than 0.09% in both
Factor | Distortion Factor i
‘ channels. |
es ae ee a = at ets = somes : a
Contiimation of If funing indieatar is not
4 Tuning indicator centered, re-adjust Steps 2 and
Cente ring 3 above.
High Rane TCo | Maximum output 108 MHz, 60 dB (anisti9) input. |
5 Scale (Giont End) | Minimum Distortion Scale indicator to 108 MHz.
indication . Factor Error: Within +250 kHz
Confirmation | Maximum output 88 MHz, 60 dB (mono) input. |
6 | of Low Range ' Minimum Distortion Scale indicator to 88 MHz.
Scale indication Factor Error: Within +250 kHz |
i el] : - pera 7
4 | High Range TCR, TCA Less than 3% 108 MHz, ess than 6 dB
Sensitivity - Eten Epa Distortion Factor | (mons) inpue
CBunaation: Less than 3% 88 MHz, bess “thas 6 dB
8 of Low Range Hisorhion Pace (mono) input.
| Scale indication Rel to NOTES 2, 3
9 ues tevel | VRI30kB “No Signal emitted Kode to STEREO. |
from output
98 MHz, 22 dB (mono) input.
10