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MOBILE AUDIO SYSTEM
POW ER OP EN
DE
O
EQ
M
AUDIO 3 i n 1 CD CA S S E T T E R E CE IV E R
ADJ UST
LOUD
LO C
ST D SP
PUSH
SELEC T
LO UD SW
M O /S T
A S/PS
TUN E EQ CLAS RPT DIS C
TRAC K IR
SKIP
1 PA U 2 SC N 3 RP T 4 RN D 5CD 6 CD AUX IN
BAND
MODEL: AKAI ACR-18H
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CONTENTS
Page
Disassembly Instructions................................................................................................................................... 3
Disassembly Diagram........................................................................................................................................ 4
Operation Check................................................................................................................................................ 5
Block Diagram ................................................................................................................................................... 6
Alignment Locations .......................................................................................................................................... 7
Alignment Procedures ....................................................................................................................................... 8
Printed Circuit Boards........................................................................................................................................ 9
Wiring Diagram ................................................................................................................................................18
Exploded Views (Panel) ..................................................................................................................................19
Exploded View Parts Lists (Panel) ..................................................................................................................20
Exploded Views (Cabinet) ...............................................................................................................................21
Exploded View Parts Lists (Cabinet) ...............................................................................................................22
Exploded View (Deck) .....................................................................................................................................24
Exploded View Parts List (Deck) .....................................................................................................................25
Schematic Diagram .........................................................................................................................................27
Electrical Parts List ..........................................................................................................................................30
Specifications...................................................................................................................................................37
2
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DISASSEMBLY INSTRUCTIONS
1. Remove two screws (A) located on the rear of the top cover then remove the Top Cover
2. Remove two screws (B) located on the rear of the bottom cover then remove the Bottom Cover.
3. Remove two screws (C) located front the base.
Remove two screws (D) from the rear cabinet and remove two screws (E) from the CD bracket then remove
the CD Deck and the CD Bracket.
4. Remove two screws (F) from the cassette deck bracket and remove two screws (G) from the rear cabinet.
Remove two screws (H) from the CASS front bracket then remove the Cass Front Bracket.
Remove two screws (I) from the CASS rear bracket then remove the Cassette Deck and the Cass Rear
Bracket.
5. Take out the Panel.
Remove four screws (J) from each side of the Base and remove two screws (K) from base the front then
remove the Base.
6. Remove two screws (L) from the Left Cabinet then remove the Left Cabinet.
7. Remove two screws (M) from the Heat Sink and remove two screws (N) from the Rear Cabinet of the left
side then remove the Heat Sink and the IC 8571 Bracket.
8. Remove the screw (O) and remove the Antenna Socket J-020-03 SINGL. Hole.
9. Remove the screw (P) and two screws (Q) from the rear cabinet of the back then remove the IC7809
Bracket.
10. Remove the screw (R) from under the main board then remove the Main Board and the Rear Cabinet.
3
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DISASSEMBLY DIAGRAM
4
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OPERATION CHECK
GENERAL SPECIFICATIONS OF SIGNAL
Standard frequency FM 98.1 MHz (87.5, 108 MHz)
MW 1000 kHz (522, 1620 kHz)
LW 200 kHz (144, 288 kHz)
Signal output FM 1mV
MW 5mV
LW 5mV
Modulation MW 400 Hz 30% MOD.
FM Stereo 1 kHz 75 kHz DEV.
90% for L only or
R only pilot level 10%
AF output level FM/MW/LW
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
5
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BLOCK DIAGRAM
6
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ALIGNMENT LOCATIONS
FM/MW/LW TUNER
7
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ALIGNMENT PROCEDURES
FM ADJUSTMENT
Equipment Required
AM IF/RF signal generator
Solid-state voltmeter (SSVM)
Regulated DC power supply
2-CH voltmeter
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 Generator Display Adjustment Remarks
Coupling Setting
Stereo Signal 98.1 MHz Adjust AF
Separation Generator Int. 1 kHz output power
to antenna Dev. 75 kHz 98.1 MHz VR1 at maximum
receptacle L+R = 90 % separating more
pilot = 10 % than 30 dB
FM SNC 98.1 MHz
Adjustment Dev. 75 kHz 98.1 MHz 98.1 MHz VR2 Stereo Separation
L+R=90 % @ 40 dB