Akai AC-R18-H Service Manual
MOBILE AUDIO SY
STEM
POW ER
E
Q
PUSH
SELEC T
BAND
AUDIO
ADJUST
TRACK
3 in 1 C D CA S S E T T E R E CE IV ER
LOUD
ST
EQ RPT
TUNE
SKIP
CLAS
1
PAU
23456
SC N RPT RND CD CD
DISC
OPEN
P
S
D
LO UD SW
M
O
/
S
T
IR
AUX IN
LO C
AS/PS
E
D
O
M
MODEL: AKAI ACR-18H
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
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
DISASSEMBLY DIAGRAM
4
OPERATION CHECK
GENERAL SPECIFICATIONS OF SIGNAL
Standard frequency
Signal output
Modulation
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
FM
MW
LW
FM
MW
LW
MW
FM Stereo
98.1 MHz (87.5, 108 MHz)
1000 kHz (522, 1620 kHz)
200 kHz (144, 288 kHz)
1mV
5mV
5mV
400 Hz 30% MOD.
1 kHz 75 kHz DEV.
90% for L only or
R only pilot level 10%
5
BLOCK DIAGRAM
6
FM/MW/LW 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
98.1 MHz
98.1 MHz VR2
98.1 MHz
Setting
Adjustment Remarks
VR1
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
KEY BOARD
BOTTOM VIEW
12
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