Service Manuals, User Guides, Schematic Diagrams or docs for : Akai ACR ACR-24MPU ACR-24MPU

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PLL SYNTHESIZER STEREO RADIO WITH
COMPACT DISC PLAYER DIGITAL

ENT/LOU BND
OPEN POWER
IR
EQ
Push
SEL
0
DSP

D-AUD

AMS 9

REG REC DIR

AF TA PTY 1 PAU 2 SCN 3 RPT 4 SHF 5 6 MOD 8

MODEL: ACR-24MPU
CONTENTS

Page
Disassembly Instructions....................................................................................................................................... 3
Disassembly Diagram............................................................................................................................................ 4
Operation Check.................................................................................................................................................... 5
Block Diagram ....................................................................................................................................................... 6
Alignment Locations .............................................................................................................................................. 7
Alignment Procedures ........................................................................................................................................... 8
Printed Circuit Boards............................................................................................................................................ 9
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 .............................................................................................................................................. 29
Specifications....................................................................................................................................................... 36

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 screws (C) from on the front side of the Base.

5. Remove two screws (D) from on the right side of the side bracket.
Remove two screws (E) from on the left side of the side bracket.

6. Remove two screws (F) from under the deck front bracket then remove the Deck Front Bracket.
Remove two screws (G) from under the deck rear bracket then remove the Deck Rear Bracket and the
Deck.

7. Remove the screw (H) from on the right side of the side bracket then remove the IC Bracket.

8. Remove two screws (I) from on the left side of the heat sink then remove the Spring Sheet.

9. Remove three screws (J) from on the left side of the heat sink then remove the Heat Sink.

10. Remove the screw (K) from on the back of the side bracket and remove two screws (L) from on the main
board then remove the Heat Sink (7809/DB435).

10. Remove two screws (M) from on the back of the side bracket then remove Wire Clip.

11. Remove two screws (N) from each side of the base then remove the Base.

12. Remove three screws (O) from under the main board then remove the Side Bracket and the Main Board.

3
DISASSEMBLY DIAGRAM

4
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 5 mV
LW 5 mV
Modulation MW 400 Hz 30% MOD.
FM Stereo 1 kHz 75kHz DEV.
46% for L only or
R only pilot level 8%

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
ACC (DV14.4V)
2-SPEAKER 4-SPEAKER 4-SPEAKER 2-SPEAKER
RR.
RL. SPK.
SPR. BACK UP (14.4V)
FRONT FRONT
SPK. SPK.
FL. FR.
SPK. SPE. GROUND

POWER ANTANNA

MAIN UNIT

ANT

MPX
DUMMY STEREOS
DISTORTION ANTANNA MODULATOR
METER VTVM VTVM

AM SG FM SG

5
BLOCK DIAGRAM

6
ALIGNMENT LOCATIONS

FM TUNER BOARD

7
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 98.1 MHz VR1 output power
to antenna Dev. 75 kHz at maximum
receptacle L+R = 90 % separating
pilot = 10 % more 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

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