Text preview for : ACR-57.pdf part of Akai ACR-57 Akai ACR ACR-57 ACR-57.pdf
Back to : ACR-57.pdf | Home
PULL SYNTHESIZED STEREO RADIO WITH
COMPACT DISC PLAYER DIGITAL
OPEN POWER
CLK SET HOUR
IR
DSP DIGITAL TIME
MANU/
SKIP
ST AMS AM PM
P-EQ LOUD CDP
RESET MINUTE
COLOR DUAL TIME CAR COMPACT PLAYER EJECT
AU
DIO ADJUST LOUD
MONO LOC MUTE 1 PAU 2 SCN 3 RPT 4 SHF 5 CD 6 CD MODE BAND
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
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 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.
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 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
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/AM TUNER
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