Akai UC-K2 User manual

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AKA) •Tt::AE □ INTEOl"'IATEO AMPLIFIER cnod•l uc-ue
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AKAi FM AM !ii.TEAE □ ol..Jf',IE;A modal we-Ke
FM AM STEREO TUNER
MODEL UC-K2
STEREO INTEGRATED AMPLIFIER
MODEL UC-U2
STEREO CASSETTE DECK
MODELUC-M2

•
•
FM AM STEREO TUNER
MODEL U C-1(2
STEREO INTEGRATED AMPLIFIER
MODEL UC-U2
STEREO CASSETTE DECK
MODELUC-M2
ALSO APPLICABLE TO BLACK PANEL MODEL
TABLE OF CONTENTS
SECTION 1 MODEL UC-K2 . . . . . . . . . . . . . . . . . . . . . . . . 3
SECTION 2 MODEL UC-U2 . . . . . . . . . . . . . . . . . . . . . . . . 15
SECTION 3 MODEL UC-M2 . . . . . . . . . . . . . . . . . . . . . . . . 29
SECTION 4 PARTS LIST .......................... 47
SECTION 5 SCHEMATIC DIAGRAM ................ 78

•
·•
SECTION 1
FM AM STEREO TUNER
,\10DEL u C-1(2
ALSO APPLICABLE TO BLACK PANEL MODEL
TABLE OF CONTENTS
I. TECHNICAL DATA.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
II. DISMANTLING OF UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
III. CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
IV. PRINCIPAL PARTS LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
V. VOLTAGE CONVERSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
VI. TUNER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1. FM TUNER SECTION ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . 10
2. AM TUNER SECTION ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . 12
VII. CLASSIFICATION OF VARIOUS P.C BOARDS . . . . . . . . . . . . . . . . . . . 13
I. P.C BOARD TITLES AND IDENTIFICATION NUMBERS ........... 13
2. COMPOSITION OF VARIOUS P.C BOARDS . . . . . . . . . . . . . . . . . . . . 14
For basic adjustments, measuring methods, an<l operating principles, refer to GENERAL TECHNICAL
MANUAL.
3

I. TECHNICAL DATA
FM TUNER SECTION
FREQUENCY RANGE
SENSITIVITY (IHF)
CAPTURE RATIO
SELECTIVITY (IHF)
IMAGE REJECTION
IF REJECTION
SPERIOUS REJECTION
AM SUPPRESSION
SIGNAL TO NOISE RATIO
HARMONIC DISTORTION
FM FREQUENCY RESPONSE
MUTING
STEREO SEPARATION
PILOT SIGNAL SUPPRESSION
SUB CARRIER SUPPRESSION
OUTPUT VOLTAGE
ANTENNA INPUT IMPEDANCE
AM TUNER SECTION
FREQUENCY RANGE
SENSITIVITY (IHF)
SELECTIVITY (IHF)
IMAGE REJECTION
IF REJECTION
SIGNAL TO NOISE RATIO
OUTPUT VOLTAGE
ANTENNA
MISCELLENEOUS
SEMICONDUCTORS
POWER REQUIREMENTS
POWER CONSUMPTION
DIMENSIONS
WEIGHT
88 MHz to 108 MHz
76 MHz to
90 MHz (Japan only)
1.9 µV
More than 1.5 dB
More than 55 dB
More than 50 dB
More than 85 dB
More than 60 dB
50 dB
67 dB
MONO: Less
than 0.15% (100% modulation)
STEREO: Less
than 0.3% (100% modulation)
20 Hz to 15,000 Hz +l dB, -1 dB
Switchable to ON - OFF
More than 40 dB (1 kHz)
More than 55 dB
More than 55 dB
1 V (100% modulation)
300 ohms balanced. 75 ohms unbalanced
525 kHz to 1,605 kHz
250 µV/m (Bar Antenna)
More than 30 dB
More than 40 dB
More than 35 dB
More than 40 dB
0.3 V (30% modulation)
Built in ferrite bar antenna
Transistors: 4, Diodes: 21, ICs: 10,
LEDs: 8, FETs: 1
lO0V, 50/60 Hz for Japan
120V, 60 Hz for USA and Canada
220V, 50 Hz for Europe except UK
240V, 50 Hz for UK and Australia
11 0/l 20/220/240V. 50/60 Hz internally switchable for other
countries
12W for JPN, CSA. AAL, U/T Models
280(W) x 56(H) x 303(D) mm (11.0 x 2.2 x 11.9) inches
3.0 kg (6.6 lbs)
* For improvement purposes, specifications and design are subject to change without notice.
4
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..
II. DISMANTLING OF UNIT
In case of trouble, etc. necessitating dismantling, please dismantle in the order shown in the photographs. Reassemble
in reverse order.
2
3
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UPPErt
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SCREWS
4
5
6
5

Ill. CONTROLS
3 6j 7 8 9
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Fig. 1 Controls
1.
POWER SWITCH
8.
AM SWITCH
2.
AM DIAL SCALE
9.
TUNING KNOB
3.
FM DIAL SCALE
10.
FM and AM ANTENNA TERMINALS
4. SIGNAL STRENGTH INDICATOR
11.
AM FERRITEBAR ANTENNA
5. FM
STEREO LAMP
12.
OUTPUT JACKS
6.
FM MODE SWITCH
13.
AC POWER CORD
7. FM SWITCH
6

PARTS LOC.ATJON
7

V. VOLTAGE CONVERSION
Models for Canada, USA, Australia, Japan and Europe
are not equipped with this facility. This machine can be
set to 110V, 120V, 220V or 240V as required. Each
machine is preset at the factory according to destination.
However, if voltage change is necessary, this can be
accomplished by a qualified service personnel as follows:
1. Disconnect power cord.
2. Loosen holding_screws and remove top panel.
3. With a flat bladed screwdriver rotate the selector,
located on the left hand side (Power Switch side),
until the arrow points to the desired voltage.
8
FRONT
..ilfllll'I'
Fig. 3 Voltage Conversion (U/T Model)

•
VI. TUNER ADJUSTMENT
R3f7
AFC P. C BOARD
DISTORTION
T201-o T20f-b
~~~~L ~; I@) @)I tTP~2l
0 O
CENTER~ ~
R210 ~ S CURVE mTP20f TP203
"' -
0 ..
LS C56 -..J
STEREO
SEPARATION
(~
II.IIJI ~ ) FM HIGH
IF/NJ~ RANGE
!=+======!==~=!-+=+-! SCALE IND.
css
FM HIGH RANGE SENS
---FRONT END
C60
AM
~} Tl
~ ~ FRONT ENO R107
RANGE (DISTORTION) O
IF AMP
GAIN
□---{]
D----0
D----0
AM HIGH l IF COIL ~
SCALE IND. (SKY) @
~==l=~:l=L=4~=w~L3 ( ~ ~
r ✓ ;J) AM HIGH ( /""7>, TIO!
~ RANGE SENS. V AM IF
0
C54
FM HIGH RANGE SENS
R516
SIGNAL i;-=--.
LED SENS 0
(AM) ~
0 0
□□,
"----=-"'
R515
SIGNAL
LED SENS
(FM)
FM S. S.G
TERMINATION PAD
=
JC30f
C59 (RED>
Tt02
IBLK)
L2 MIB1\lllffiu
PLL
FREE-RUN
FREQ.
TP301
Leh
~:T~~f t0 ::1 m
TI03
IRED)
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9
AM LOW RANGE
SCALE IND.
AM IF
Fig. 4 Tuner P.C Board
FREQUENCY
COUNTER
INPUT
AC VOLTMETER
EXT. MOD
INPUT
()-t--t--0 300 OHMS OUTPUT
OUTPUT
FM STEREO
GENERATOR
750HMS : 300 OHMS
-6dB o-+--+-<>ANTENNA
TERMINAL
CENTER
TUNING METER
Reh
OUTPUT
DISTORTION
METER
INPUT
Leh
AC VOLTME TE R
~
Lc:t---J
Fig. 5 Instrument Connections
9

1. FM TUNER SECTION ADJUSTMENT (Refer to Figs. 4, 5)
Step Adjustment Adjustment Result Remarks
Item Point
Front End
Tl
Selector to FM, and Mode to MONO.
1
IF Coil (Front End) Maximum Noise Level Detune and receive only interstation
noise.
Connect a Center Tuning Meter between
Centered Tuning TP201 and TP203.
2 S Curve Center T201-b 98 MHz (Japan: 83 MHz) 60 dB (mono)
Meter Indication input.
Refer to NOTE 1
T201-a Less than 0.15% 98
MHz (Japan: 83 MHz)
3 Distortion Factor
Tl
Distortion Factor 60
dB (mono) input.
(Front End) Modulation: 1 kHz, 100%
4 Readjust in steps 2 and 3.
108 MHz (Japan: 90 MHz)
t)
Maximum Output 60
dB (mono) input.
5 High Range Scale C56 Minimum Distortion Modulation: 1 kHz, 100%
Indication
(Front End) Factor Scale indicator to 108 MHz
(Japan: 90 MHz)
Error: within± 250 kHz
88 MHz (Japan: 76 MHz)
Confirmation of
Maximum Output 60
dB (mono) input.
6 Low Range Scale Minimum Distortion Modulation: 1 kHz, 100% Scale
Indicator to 88 MHz
Indication Factor (Japan: 76 MHz)
Error: within ± 250 kHz
High Range C54,C55
Less than 3%
108 MHz (Japan: 90 MHz), Better than
7 6
dB (mono) input.
Sensitivity (Front End) Distortion Factor Modulation: 1 kHz, 100%
Confirmation of
88 MHz (Japan: 76 MHz), Better than
8 Low Range Less than
3%
6 dB (mono)
Sensitivity Modulation: 1 kHz, 100%
1. Detune then turn R515 (50 k) and temporarily light Signal
Signal LED LED
1.
9 R515 (50 k) 2. Turn R515 (50 k)
in clockwise direction until LED 1goes out.
Sensitivity 3. Input 98
MHz (Japan: 83 MHz), 60 to 80 dB and check that
Signal LED 5 lights.
Mode Switch to STEREO. 98 MHz (Japan: 8"3 MHz) 30 dB
10
FM Mute Level R210 (50 k) input. Adjust R210 (50 k) to the point where the output signal
appears.
PLLMPX Connect Frequency Counter between
11
Free Running R304 (10 k) 19.00 kHz TP301 and Ground 98
MHz
(Japan: 83 MHz)
Frequency Modulation: not
Confirmation of
98 MHz (Japan: 83 MHz)
12 STEREO Indicator Must be lighted 60
dB (stereo) input.
Modulation: 1 kHz, 100%, only light
indicator Lighting channel

Step Adjustment Adjustment Result Remarks
Item Point
98 MHz (Japan: 83 MHz)
13
Stereo SepRration
R317(50k)
More than 40 dB
60 dB (stereo) input.
(Left to Right) Moduation: I kHz. 100% only Left
channel
98 MHz (Japan: 83 MHz)
14
Stereo Separation
R317(50k)
More than 40 dB
60 dB (stereo) input.
(Right to Left) Modulation: I kHz, 100% only Right
channel
Chart-I
NOTE: For the center meter, use a tunning meter supplied as parts for other models.
11

Step Adjustment Adjustment Result Remarks
Item Point
Selector to AM. 600 kHz, 34 dB from
I IF Amp Gain R107
(I k) 50
mV (OUTPUT) SSG to TPl input.
Modulation: I kHz, 30%
Low Range Scale
530 kHz 50 dB input.
2 Indication
TI03 (RED) Maximum Output Scale indicator to 530 kHz.
Error: within 2%
Low Range
TI0l, Tl02 (IF) Maximum Output 530 kHz 50
dB input.
3 Bar Antenna Minimum Distortion
Sensitivity Coil Factor Less than
10% Distortion Factor
High Range Scale C60 1600 kHz 50
dB input.
4 Indication (Front End) Maximum Output Scale indicator to 1600 kHz.
Error: within 2%
• High Range C59 Maximum Output 1600 kHz 50
dB input.
5 Minimum Distortion
Sensitivity (Front End) Factor Less than
10% Distortion Factor
1. Detune, then turn RS 16 (50 k) and temporarily light Signal
LED 1.
6 Signal LED
R516(50k)
2. Turn RS 16 (50 k) in counterclockwise direction until LED 1
Sensitivity
goes out.
3. Input 1000 kHz, 90 to 120 dB from the AM ANT terminal
and check that signal LED 4.
Chart-2
NOTE: For the best results, repeat Steps 1 through 5 two or three times.
•

2. AM TUNER SECTION ADJUSTMENT
12
BAR ANTENNA COIL\ -
1===-1RF'==~==lrF1•11-=
Fig. 6 Bar Antenna
NOTE: The Bar Antenna coil need only be adjusted if the measured
result lies outside the specified range.
AM S.S. G
OUTPUT
AM S S G
OUTPUT
AMS S. G
TEST LOOP
ANTENNA
(a) Step I
APRROX
600mm
(b) Steps 2 to 5
UC-K2
UC-K2
UC-K2
AM EXT.
AC
VOLTMETER
AC
VOLTMETER
E]
AC
VOLTMETER
OU TPUTo---+-c-r------------+.-~ ~~~i~~:L
GND
L ch OR Reh o-t---c+-~++-0
OUTPUT
(c) Step 6
Fig. 7 Instrument Connections

VII. CLASSIFICATION OF VARIOUS P.C BOARDS
1. P.C BOARD TITLES AND IDENTIFICATION NUMBERS
P.C Board Title P.C Board Number
Tuner P.C Board 72-1859
LED Ind. P .C Board 72-1860
Lamp Ind. P.C Board 72-1861
Power Switch P .C Board 72-1873
AFC P.C Board 72-1927
Dial Pointer P.C Board 72-1862
Chart-3
13

2. COMPOSITION OF VARIOUS P.C BOARDS
TUNER P.C BOARD 72-1859, AFC P.C BOARD 72-1927, LED IND. P.C BOARD 72-1860, LAMP IND. P.C BOARD 72-1861 and POWER SWITCH P.C BOARD 72-1873
14
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AFC P. C BOARD
72-1927
6
TUNER PC BOARD 72-1859
LEO I ND P. C SOARD
72-1860
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DIAL POINTER
P C SOARD
72-1862
0801,802
L~J2•GP
POWER SWITCH PC BOARD
72-1873
o ----H--------- o
POWER SWITCH PC BOARD
72-1873
LAMP IND P. C SOARD 72-1861
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WARNING: &INDICATES SAFETY CRITIC.AL ::oi..•~JNENTS :CQR
REPLACE SAFETY CRITICAL COIJ.P::'',;E:NTS ONC.Y WITH
RECOMMENDED PARTS
AVERTISSEMENT' & IL lf'<DIOU LES COMPos,:g•·s CRITIQ:..:ES DE sURETE POL,R
MAINTENIR LE DEGRE DE SECGR,~E ~EL' APPt.Rt.lL NE REMPLACE,=? LES
CONPOSANTS OONT LE FONl T1Qr.;',E~ENT EST CRITIQUE r''OL:R ._A SECL.:RITE
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I.
SECTION 2
STEREO 11\TEGHATED AMPLIFIEH
,10DEL u C- u2
ALSO APPLICABLE TO BLACK PANEL MODEL
TABLE OF CONTENTS
TECHNICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
II. DISMANTLING OF UNIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
III. CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
IV. PRINCIPAL PARTS LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
V. VOLTAGE CONVERSION .................................. 20
IV. LEVEL DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
VII. AMPLIFIER ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
1. IDLING CURRENT ADJUST\!ENT ..
2. LEVEL METER ADJUSTMEl\T. . . . . . . . . . . . . . . .:'J
VIII. CLASSIFICATION OF VARIO US P.C BOARDS . . . . . . . . . . . . . . . . . . . 24
I. P.C BOARD TITLES AND IDENTIFICATION NUMBERS. . . 24
2. COMPOSITION OF VARIOUS P.C BOARDS . . . . . . . . . . . . . . . . 25
For basic adjustments, measuring methods, and operating principles, refer to GENERAL TECHNICAL
MANUAL.
I 5

I. TECHNICAL DATA
RATED POWER OUTPUT 23 watts per channel, minimum RMS, at 8 ohms from
(2-Channel Driven) 20 to 20.000 Hz with no more than 0.06% total harmonic
distortion
POWER BANDWIDTH (IHF) 10 Hz to 40 kHz/8 ohms
(Total harmonic distortion: 0.06%)
SIGNAL TO NOISE RATIO (IHF) PHO!\O: Better than
75 dB
AUX: Better than
90 dB
RESIDUAL NOISE Less than 0.6 mV at 8 ohms
CHANNEL SEPARATION (IHF) PHONO: Better than 50
dB at 1,000 Hz
AUX: Better than 55
dB at 1,000 Hz
DAMPING FACTOR More than 40 (1 kHz, 8 ohms)
OUTPUT Speakers:
A, (4 to 16 ohms)
Headphone: 8
to 200 ohms
INPUT SENSITIVITY/IMPEDANCE PHONO: 3 mV/47 kohms
AUX: 150 mV/47 kohms
TUNER: 150 mV/47 kohms
TAPE: PIN: 150 mV/47 kohms
OUTPUT LEVEL/IMPEDANCE Tape Rec: PIN: 150mV/5kohms
FREQUENCY RESPONSE PHOJ\O:
30 Hz to 15 kHz, +1 dB, -1 dB (RIAA)
AUX: 10
Hz to 50 kHz, +l dB, -2 dB
TONE CONTROL
Bass:
±10 dB at 100 Hz
Treble: ±10
dB at 10 kHz
LOUDNESS CONTROL +10 dB at 100 Hz, +6 dB at 10 kHz
SEMICONDUCTORS Transistors: 20, Diodes: 19, ICs: 4, LEDs: 10
POWER REQUIREMENTS 100V. 50/60 Hz for Japan
120V. 60 Hz for USA and Canada
220V. 50 Hz for Europe except UK
240V. 50 Hz for UK and Australia
110/120/220/240V. 50/60 Hz internally switchable for
other countries
POWER CONSUMPTION 70W for JPN Model
88W for AAL Model
145\V for CSA, U/T Models
DIMENSIONS
280(\\) x 69(H) x 280(0) mm (11.0 x 2.7 x I1.0 inches)
WEIGHT 4.5
kg (9.7 lbs)
* For improvement purposes, Specifications and design are subject to change without notice.
16

•
•
-
II. DISMANTLING OF UNIT
In case of trouble, etc. necessitating dismantling, please dismantle in the order shown in the photographs. Reassemble
in reverse order.
2
3
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17

( left
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