Akai AC-R143-MP Service Manual

CD/MP3–RECIVER
Model:
ACR-143MP
SERVICE MANUAL
www.akai.ru
CONTENTS
Page
Disassembly Instructions........................................................................................................................................ 3
Disassembly Diagram............................................................................................................................................. 4
Operation Check.....................................................................................................................................................5
Block Diagram ........................................................................................................................................................ 6
Alignment Locations ............................................................................................................................................... 7
Alignment Procedures ............................................................................................................................................ 8
Printed Circuit Boards........................................................................................................................................... 10
Exploded Views (Panel)........................................................................................................................................ 17
Exploded View Parts Lists (Panel)........................................................................................................................ 18
Exploded Views (Cabinet)....................................................................................................................................19
Exploded View Parts Lists (Cabinet ).................................................................................................................... 20
Exploded Views (Deck)......................................................................................................................................... 22
Exploded View Parts Lists (Deck)......................................................................................................................... 23
Schematic Diagram .............................................................................................................................................. 25
Electrical Parts List...............................................................................................................................................28
Specifications........................................................................................................................................................ 35
2
DISASSEMBLY INSTRUCTIONS
1. Using the unlock key that came with the unit or a similar tool, unlock the Mounting Box and remove toward the rear of the unit.
2. Remove two screws (A) located on the rear of the top cabinet then remove the Top Cabinet.
3. Remove two screws (B) located on the rear of the bottom cabinet then remove the Bottom Cabinet.
4. Take out the Front Panel and the Ring. Remove the screw (C) from on the front side of the Base.
5. Remove two screws (D) from on the right side of the Rear-right Cabinet. Remove the screw (E) from on the left side of the Rear-right Cabinet and the scre w (F) on the ri ght side of the heat sink.
6. Remove two screws (G) from under the deck front bracket then remove the Deck Front Bracket. Remove two screws (H) from under the deck rear bracket then remove the De ck Rear Bra cket and th e Deck.
7. Remove two screws (I) from on the back of the Rear-right Cabinet then remove the Power IC Bracket
8. Remove two screws (J) from on the left side of the heat sink.
9. Remove two screws (K) from on the left side of the heat sink then remove the IC Bracket.
10. Remove the screw (L) from on the back of the side bracket then remove Wire Clip.
11. Remove two screws (M) from each side of the base then remove the Base.
12. Remove three screws (N) from under the main board then remove the Heat Sink, Rear-right Cabinet and the
Main Board.
3
DISASSEMBLY DIAGRAM
4
OPERATION CHECK
GENERAL SPECIFICATIONS OF SIGNAL
Standard frequency
FM MW
98.1 MHz (65.0, 74.0MHz) (87.5, 107.9 MHz) 1000 kHz (522, 1620 kHz)
Signal output
Modulation
FM MW MW FM Stereo
1mV 5 mV 400 Hz 30% MOD. 1 kHz 75kHz DEV. 46% for L only or R only pilot level 8%
AF output level FM/MW Power source voltage DC 14.0V (Backup voltage is the same as this) AF load impedance 4 ohm pure resistance
Balance Center position of level Tone Center position
The signal strength read in this section is voltage on the antenna. Test Diagram
2-SPEAKER
FRONT SPK.
4-SPEAKER
RL. SPR.
FL. SPK.
4-SPEAKER
RR. SPK.
FR. SPE.
2-SPEAKER
FRONT SPK.
ACC (DV14.4V)
BACK UP (14.4V)
GROUND
DISTORTION METER
VTVM
VTVM
DUMMY ANTANNA
AM SG
MAIN UNIT
FM SG
POWER ANTANNA
ANT
MPX STEREOS MODULATOR
5
BLOCK DIAGRAM
6
MITSUMI TUNER
ALIGNMENT LOCATIONS
7
ALIGNMENT PROCEDURES
FM ADJUSTMENT
Equipment Required
z AM IF/RF signal generator z Solid-state voltmeter (SSVM) z Regulated DC power supply z 2-CH voltmeter z Distortion meter
FM Alignment Using FM Signal Generator
Note: Press the radio power switch to on the radio. Signal generator output must be kept as low as possible
to avoid overload and clipping.
Step Generator
Coupling
Stereo Separation
FM SNC Adjustment
Stop SENS.
Note: The tuner module is well-adjust and adjustment is not recommended.
Signal Generator to antenna receptacle
98.1 MHz Dev. 75 kHz L+R=90 % Int. 1 kHz 60dBµV output
Signal Generator to antenna receptacle
Generator Display
98.1 MHz Int. 1 kHz Dev. 75 kHz L+R = 90 % pilot = 10 %
98.1 MHz @ 40 dBµ
98.1 MHz Mod. 1kHz Dev 75kHz
Adjustment Remarks
Setting
98.1 MHz VR1
98.1 MHz VR2
98.1 MHz VR3
Adjust AF output power at maximum separating more than 30 dB
Stereo Separation 25 dB (±5 dB)
Adjust AF to stop station.
8
MAIN BOARD
PRINTED CIRCUIT BOARDS
TOP VIEW
9
MAIN BOARD
BOTTOM VIEW
10
KEY BOARD
TOP VIEW
11
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