Akai ACR-57 User manual

PULL SYNTHESIZED STEREO RADIO WITH
COMPACT DISC PLAYER DIGITAL
OPEN
1 PA U 2 SCN 3 RPT 4 SHF 5 CD 6 CD
MANU/
SKIP
CLK SET
DSP
P-EQ
MONO LOC MUTE MODE BAND
LOUD
RESET
COLOR
HOUR
IR
AMS
MINUTE
EJECT
DUAL TIME CAR COMPACT PLAYER
POWER
A
U
D
I
O
A
D
J
U
S
T
DIGITAL TIME
PMAM
ST
LOUD CDP

2
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 .................................................................................................................................................. 15
Exploded Views (Panel)..................................................................................................................................... 16
Exploded View Parts Lists (Panel) .................................................................................................................... 17
Exploded Views (Cabinet) ................................................................................................................................. 18
Exploded View Parts Lists Cabinet) .................................................................................................................. 19
Exploded View (Deck) ....................................................................................................................................... 21
Exploded View Parts List (Deck) ....................................................................................................................... 22
Schematic Diagram ........................................................................................................................................... 24
Electrical Parts List ............................................................................................................................................ 26
Specifications..................................................................................................................................................... 32

3
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 the screw (A) located on the rear of the top cabinet then remove the Top Cabinet.
3. Remove two screw (B) located on the rear of the bottom cabinet then remove the Bottom Cabinet.
4. Remove two screws (C) (one located at the left side and one located at the right side of the Front
Bracket) then remove the Left Hook and the Right Hook.
5. Open the panel and remove the Ring and the Panel Bracket.
6. Remove the screw (D) from the main board and remove two screws (E) each side of the base then remove
the Base.
7. Remove two screws (F) from the Front bracket and remove two screws (G) from the Rear cabinet.
Remove two screws (H) from the front deck bracket then remove the Front Deck Bracket.
Remove two screws (I) from the Rear Deck Bracket then remove the Rear Deck Bracket and the Deck.
8. Remove four screws (J) and two screws (K) from the heat sink then remove the Heat Sink and IC 8568 Heat
Sink.
9. Remove the screw (L) and remove the Antenna Clip.
Remove the screw (M) and remove the Wire Clip.
10. Remove two screws (N) from the rear cabinet of the left side then remove the IC 7809 Bracket.
11. Remove four screws (O) from the main board then remove the Main Board.
12. Remove four screws (O) each side of the rear cabinet then remove the Front Cabinet and the Rear Cabinet.

4
DISASSEMBLY DIAGRAM

5
OPERATION CHECK
GENERAL SPECIFICATIONS OF SIGNAL
Standard frequency
Signal output
Modulation
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%forLonlyor
Ronlypilotlevel10%
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.
TestDiagram
4-SPEAKER
VTVM
DISTORTION
METER
2-SPEAKER
FRONT
SPK.
SPK.
FL.
RL.
SPR.
MAIN UNIT
AM SG
VTVM ANTANNA
DUMMY
FM SG
MODULATOR
STEREOS
MPX
ANT
FRONT
SPK.
SPE.
FR.
RR.
4-SPEAKER
SPK.
2-SPEAKER
POWER ANTANNA
ACC (DV14.4V)
GROUND
BACK UP (14.4V)

6
BLOCK DIAGRAM

7
ALIGNMENT LOCATIONS
FM/AM TUNER

8
ALIGNMENT PROCEDURES
FM ADJUSTMENT
Equipment Required
zAM IF/RF signal generator
zSolid-state voltmeter (SSVM)
zRegulated DC power supply
z2-CH voltmeter
zDistortion 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
Generator Display
Setting
Adjustment Remarks
Stereo
Separation
Signal
generator
to antenna
receptacle
98.1 MHz
Int. 1 kHz
Dev. 75 kHz
L+R = 90 %
pilot = 10 %
98.1 MHz VR1
Adjust AF
output power
at maximum
separating
more than 30 dB
FM SNC
Adjustment
98.1 MHz
Dev. 75 kHz
L+R=90 %
Int. 1 kHz
60dBµV output
98.1 MHz
@ 40 dBµ
98.1 MHz VR2 Stereo Separation
25 dB (±5 dB)
STOP
SENS.
Signal Generator
to antenna
receptacle
98.1 MHz
Mod. 1kHz
Dev 75kHz
98.1 MHz VR3
Adjust AF to stop
station.
Note: The tuner module is well-adjust and adjustment is not recommended.

9
PRINTED CIRCUIT BOARDS
MAIN BOARD

10
KEY BOARD
TOP VIEW

11
KEY BOARD
BOTTOM VIEW

12
CD SERVO BOARD
TOP VIEW

13
CD SERVO BOARD
BOTTOM VIEW

14
LAMP BOARD

15
WIRING DIAGRAM