akira MC-VCM2 User manual

COMPACT DISC PLAYER
Service Manual

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Model No.: MC-VCM2
Version: 1.0
MODEL:
MC-VCM2

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Model No.: MC-VCM2
Version: 1.0
CONTENTS
IMPORTANT SAFETY NOTES ............................................................................................................. 5
SPECIFICATION..................................................................................................................................... 7
ELECTRICAL SPECIFICATION............................................................................................................ 8
EXPLODED VIEW................................................................................................................................ 14
PART LIST ............................................................................................................................................. 15
TROUBLESHOOTING GUIDE............................................................................................................ 17

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Model No.: MC-VCM2
Version: 1.0
1. IMPORTANT SAFETY NOTES
Avoid installing the unit in locations described below.
• Places exposed to direct sunlight or close to heat radiating appliances such as electric heaters.
• Places lacking ventilation or dusty.
• Places subjected to constant vibration.
• Humid or moist places.
This product utilizes a laser.
Danger - Invisible laser radiation is present when unit is opened and interlock failed or defeated.
Caution - Use of the controls or adjustments of procedures other than those specified herein may result
in hazardous radiation.
THE LASER COMPACT DISC PLAYER FUNCTIONS BY HELP OF INVISIBLE LASER LIGHT
AND IS EQUIPPED WITH SAFETY SWITCHES TO AVOID EXPOSURE WHEN DOOR IS OPEN
AND SAFETY INTERLOCKS ARE DEFEATED. IT IS DANGEROUS TO DEFEAT OR BYPASS
SAFETY SWITCHES.
DANGEROUS VOLTAGE
Uninsulated dangerous voltage, that may be of sufficient magnitude to constitute a risk of
electric shock to persons is present within this product’s enclosure.
ATTENTION
The owner’s manual contains important operating and maintenance instructions. For
your safety, it is necessary to refer to the manual.

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Model No.: MC-VCM2
Version: 1.0
Dripping warning: The product shall not be exposed to dripping or splashing and that no objects filled
with liquids, such as vases, shall be placed on the product.
Ventilation warning: The normal ventilation of the product shall not be impeded for intended use.

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Model No.: MC-VCM2
Version: 1.0
2. SPECIFICATION
CD PROGRAMABLE TRACKS 20 TRACKS
(EUROPE) 522-1620 KHz (9 KHz per step)
AM FREQUENCY RANGE (U.S.A.) 520-1720 KHz (10 KHz per step)
(Europe) 87.5-108.0 MHz (0.05 MHz per step)
FM frequency range (U.S.A.) 87.5-107.9 MHz (0.2 MHz per step)
(AM) 10 channels
Radio station memory (FM) 10 channels
(Europe) 230V 50Hz
Power supply (Main unit) (U.S.A.) 120V 60Hz
(Remote control) 2 x 1.5V (UM-3) batteries
Max power output 10 W
Operation Temperature 1-40 C (32-104 F)
(Main unit) (WxHxD) 218 x 290 x 120mm
Dimensions (Speaker) (Each) (WxHxD)180 x 290 x 120mm
Weight (Approximate) 6.25 kg (not including packing material)

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Model No.: MC-VCM2
Version: 1.0
3. ELECTRICAL SPECIFICATION
POWER SUPPLY 230V/50HZ
TEST CONDION: a. Receiver input test signal:
• FM 22.5KHZ deviation with 1000 HZ through 75 OHM dummy
antenna.
• AM 30% modulation with 400 HZ through loop antenna.
b. Electrical equalizer switch set “FLAT” position, bass booster switch set to
off position.
c. Speaker output impedance 4 OHM (headphone output impedance 32 OHM).
d. Reference output power: 500mW.

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Model No.: MC-VCM2
Version: 1.0
FM SECTION
Item Unit Nominal Limit
Low end MHZ 87.5 +/-0.2
Frequency range High end MHZ 108.0 +/-0.2
90MHZ dBu 18 26
98MHZ dBu 18 26
Usable sensitivity for S/N 30dB
106MHZ dBu 18 26
Distortion (mono) (1000uv input) 98MHZ % 1 2
S/N ration (mono) (1000uv deviation 75KHZ input) 98MHZ dB 55 50
Max output power (1000uv DEV 75KHZ input) 98MHZ W 10 9
-3dB limiting (1000uv input) 98MHZ dBu 12 16
Image rejection ratio 106MHZ dB 18
Intermediate frequency rejection 90MHZ dB 40
Spurious rejection 106MHZ dB >=50
Selectivity (+/-300KHZ EUR) 98MHZ dB 35
Overload distortion (DEV 75KHZ 100mv input) 98MHZ % 2 5
AM suppression (modulation 30%) 98MHZ dB 30 25
Audio response -6dB 98MHZ HZ 20-4500 20-4000
L-R dB 22 16
100HZ R-L dB 22 16
L-R dB 23 17
1KHZ R-L dB 23 17
L-R dB 22 16
Stereo separation
(pilot modulation 10%)
98MHZ 1000vU input
10KHZ R-L dB 22 16
Distortion (stereo 1000uV input) L/R % 2 3
Stereo indication deviation sensitivity 98MHZ KHZ >2-<=5
90MHZ dBu 26 34
98MHZ dBu 26 34
Auto scan sensitivity
106MHZ dBu 26 34
Stereo indication sensitivity 98MHZ dBu 18 26

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Model No.: MC-VCM2
Version: 1.0
AM SECTION
Item Unit Nominal Limit
522 +/-5
Frequency range KHZ 1620 +/-5
603KHZ dB/m 54
999KHZ dB/m 54
Maximum sensitivity
1404KHZ dB/m 54
603KHZ dB/m 54 60
999KHZ dB/m 54 60
Usable sensitivity for 20dB S/N
1404KHZ dB/m 54 60
3 5T.H.Distortion
30% modulation 5mv/m input
80% modulation 100mv/m input
999KHZ %
4 7
Signal to noise ratio (5mv/m input) 999KHZ dB 38 30
Intermediate frequency rejection 603KHZ dB 45 40
Image rejection 1404KHZ dB 36 28
AGC -10dB (100mv/m input) 999KHZ dB 40 35
Selectivity +/-9KHZ (EUR) 999KHZ dB 20 15
Band width –6dB 999KHZ KHZ 4-12
2xIF % 4 10Whistle modulation
1/5/100mv/m input 3xIF % 4 10
Audio fidelity –6dB (5mv/m input) 999KHZ HZ 20-2400 20-2200
603KHZ dB/m 50 60
999KHZ dB/m 50 60
Auto scan sensitivity
1404KHZ dB/m 50 60

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Model No.: MC-VCM2
Version: 1.0
CD SECTION
Item Unit Nominal Limit
T.H.D (1KHZ) –10dB JIA A Filter TCD-781 % 0.1 0.3
Maximum output power TCD-781 W 10
Channel separation TCD-781 dB 65 55
DE-Emphasis error TCD-781 dB 0.2 0.5
Interruption SBC-444A mm 0.8 0.6
Black dot SBC-444A mm 0.8 0.6
Finger prints SBC-444A TNO19 TNO18
Frequency response +/-3dB TCD-781 HZ 20-20000
Signal to noise ratio (JIA A Filter) TCD-781 dB 70 60
Channel unbalance TCD-781 dB 2
Linearity error (40dB) SBC429 dB 2
Max Vol TCD-781 mV <20
Residual hum & noise Min Vol TCD-781 mV <3
Minimum VOL hum & noise
1KHZ 0dB
TCD-781 mV 2 4

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Model No.: MC-VCM2
Version: 1.0
AUDIO SECTION (Reference output power 500mw)
Item Unit Nominal Limit
AUX input sensitivity (500mW) mV 120 160
AUX channel unbalance (500mv 1KHZ input) dB 2
AUX frequency response +/-3dB HZ 20-20000
AUX cross talk (500mV 1KHZ input) dB 65 55
Minimum VOL hum (AUX 500mV 1KHZ input) mV 1 3
10% THD output power (AUX 1KHZ input) W 10
1% THD output power (AUX 1KHZ input) W 6
Total harmonic distortion
JIA A Filter
(AUX 1KHZ 500mV input) % 0.05 0.2
Headphone 1% THD output level (CD 1KHZ 0dB) mW 50
Super woofer output level (CD 0dB 1KHZ ) mV 1200 1500
Maximum volume (47KOHM load)
Super woofer distortion
JIA A Filter
(CD –10dB 1KHZ input)
(speaker reference level output)
(47KOHM load)
% 0.15 0.4
Output level difference (FM=0dB level=60dBU deviation=40KHZ) dB
AM 80% modulation 5mV/m +/-3 +/-5
CD –10dB 1KHZ +/-3 +/-5
AUX 500mV 1KHZ +/-3 +/-5
ELECTRICAL EQUALIZER CONTROL (AUX 150mV input 1KHZ=0dB)
Mode Unit Nominal Limit
120HZ dB 0 0+/-3Flat
10KHZ dB -0.2 -0.2+/-3
120HZ dB 8 8+/-3Classic
10KHZ dB 4 4+/-3
120HZ dB -0.5 -0.5+/-3Pop
10KHZ dB 0 0+/-3
120HZ dB 11.5 11.5+/-3Rock
10KHZ dB 8 8+/-3
120HZ dB 10 10+/-3Jazz
10KHZ dB 10 10+/-3

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Model No.: MC-VCM2
Version: 1.0
MICROPHONE ( turn the ECHO to minimum )
Item Unit Nominal Limit
Input sensitivity (500mW) mV 2 3
Line output 0.07 0.2
THD
(1KHZ 10mV input) JIA
A Filter Speaker output
%
0.15 0.4
Line output 25-10000 50-9000Frequency response
+/-3Db
(1KHZ 10mVinput)
Speaker output HZ 25-10000 50-9000
Line output 60S/N
(1KHZ 10mVinput) JIA
A Filter
Speaker output dB 60
LINE OUTPUT (CD 1KHZ 0Db 47 k ohm load)
Item Unit Nominal Limit
1800+/-
Output level mV 1800 300
THD JIA A Filter % 0.02 0.1
S/N JIA A Filter dB 80 75
Frequency response
Ref: CD 1KHZ 0dB
+/-3dB HZ 20-20000
Channel separation
JIA A Filter
dB 60
Channel unbalance dB 1
Video output level TVD-581A Vp-p 1.0+/-0.2

Modelno.: MC-VCM2
Version: 1.0
4. EXPLODED VIEW
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Modelno.: MC-VCM2
Version: 1.0
4. EXPLODED VIEW
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Modelno.: MC-VCM2
Version: 1.0
4. EXPLODED VIEW
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Modelno.: MC-VCM2
Version: 1.0
4. EXPLODED VIEW
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Modelno.: MC-VCM2
Version: 1.0
4. EXPLODED VIEW
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Modelno.: MC-VCM2
Version: 1.0
4. EXPLODED VIEW
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Model No.: MC-VCM2
Version: 1.0
5. PART LIST
MAIN UNIT
NO PART NAME QTY
1 A1 PLATE 1
2 CD DOOR 1
3 LCD LENS 1
4 FRONT CABINET 1
5 RIGHT BUTTON 1
6 LED PCB 1
7 MEM. & VOL. BUTTON 1
8 LCD DISPLAY 1
9 EL CAMP 1
10 LCD CLIP-R 1
11 LCD CLIP-L 1
12 SPONGE-LCD 3
13 MAIN PCB 1
14 PAN-WASHER, S-SCREW, M3x8 3
15 NUT, M3 3
16 CONNECT PLATE 1
17 M. SCREW M3x10 1
18 AUDIO PCB 1
19 W-SCREW, W3.5x10mm 2
20 TRANSFORMER 1
21 BINDING S-SCREW, M3x16mm 6
22 W-SCREW, W2.6x10mm 1
23 METAL WASHER 1D3 0D18 THK 1 1
24 RUBBER FOOT 3
25 S-SCREW, D3x10mm BLACK 3
26 BATTERY DOOR 1
27 BATT COVER SCREW 1
28 75 Ohm SOCKET COVER 1
29 BINDING S-SCREW, D3x14 BLACK 1
30 REAR CABINET 1
31 SPEAKER JACK & ANT. JACK PCB 1

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Model No.: MC-VCM2
Version: 1.0
NO PART NAME QTY
32 EL PCB 1
33 SHIELD HOUSING 1
34 HEAT SINK 1
35 M.SCREW M3x10mm 2
36 BINDING S-SCREW, D3x8mm 10
37 FM-FRONT END PCB 1
38 BINDING S-SCREW, D3x20mm 4
39 WASHER TUBE 4
40 CD RUBBER CUSHIN 4
41 CD DECK 1
42 CD DECK COVER 1
43 SPRING SHAFT 1
44 CD DOOR GEAR 2 1
45 STEEL SHAFT 1
46 CD DOOR GEAR 1 1
47 SPRING COMPARTMENT 1
48 DUMPING GEAR 1
49 BINDING S-SCREW, D2.6x8 9
50 CD BRACKET 1
51 RIGHT BUTTON 1
52 EARPHONE PCB 1
53 SPIRAL SHEET 1
54 W-SCREW W3x14 wd8 2
55 SPRING STOPPER 1
56 SAFETY COVER 1

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Model No.: MC-VCM2
Version: 1.0
SPEAKER BOX
NO PART NAME QTY
1 SP GRILLE 2
2 SPEAKER 2
3 WOODEN SUPPORT (L) 2
4 SPEAKER RUBBER CUSHION (L) 2
5 SP FRONT CABINET 2
6 BINDING S-SCREW, M3x12mm 12
7 SP REAR CABINET 2
8 RUBBER FOOT 6
9 WOODEN SUPPORT (S) 6
10 NATURAL RUBBER 16
11 W.SCREW W3x10 8
12 TWEETER SPEAKER 2
13 PAN WASHER S-SCREW, D2.6x10 4
SPEAKER BOX
NO PART NAME QTY
1 INLAY PVC (RMT) PVC 1
2 CAB FRONT (RMT) ABS 1
3 REMOTE-KEY PAD 1
4 REMOTE-KEY PAD 1
5 REMOTE CONTROL PCB 1
6 CONTACT BATT + (RMT) 1
7 CONTACT BATT – (RMT) 1
8 CONTACT BATT +/- (RMT) 1
9 CAB REAR (RMT) 1
10 DOOR BATT (RMT) 1

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Model No.: MC-VCM2
Version: 1.0
6. TROUBLESHOOTING GUIDE
Before requesting service for this unit, check the chart below for a possible cause of the problem you are
experiencing. Some simple checks or a minor adjustment on your part may eliminate the problem and
restore proper operation.
If you are in doubt about some of the check points, or if the remedies indicated in the chart do not solve
the problem, refer to the directory of Authorized Service Centers to locate a convenient service center, or
consult your dealer for instructions.
Problem Checkpoint Remedy
1. Is power supply connected well? 1. Re plug the AC power cord.
2. Is batteries of the remote control dead? Change batteries of remote control.
3. Is the desired mode selected? 2. Press related button according to the
instruction above.
4. Is disc loaded correctly? 3. Load the disc correctly and close the
compartment lid securely.
No playing
5. Is the compartment closed?
No display 1. Has TV been well connected? Recheck the connection.
1. Is the speaker connected correctly? 1. Check the connection.
No sound 2. Is the headphone plugged firmly? 2. Insert the headphone plug into the phone
jack firmly.
1. Is there any facility interference? 1. Change the position of the unit.
Noise or weak in
radio receiving 2. Is the FM antenna installed properly? 2. Re-install FM antenna.