Akai-ACR-57-Service-Manual(1) 电路图 维修手册.pdf

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1、 PULL SYNTHESIZED STEREO RADIO WITH COMPACT DISC PLAYER DIGITAL OPEN 1 PAU2 SCN3 RPT4 SHF5 CD6 CD MANU/ SKIP CLK SET DSP P-EQ MONOLOCMUTEMODEBAND 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 LOUDCDP RadioFans.CN 收音机爱 好者资料库 2

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

3、 Lists Cabinet) .19 Exploded View (Deck) .21 Exploded View Parts List (Deck).22 Schematic Diagram .24 Electrical Parts List.26 Specifications.32 RadioFans.CN 收音机爱 好者资料库 3 DISASSEMBLY INSTRUCTIONS 1. Using the unlock key that came with the unit or a similar tool, unlock the Mounting Box and remove to

4、ward 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

5、 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

6、 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 re

7、move 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 t

8、he Main Board. 12. Remove four screws (O) each side of the rear cabinet then remove the Front Cabinet and the Rear Cabinet. RadioFans.CN 收音机爱 好者资料库 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

9、 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% 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 Cent

10、er position of level Tone Center position The signal strength read in this section is voltage on the antenna. Test Diagram 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.

11、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 ? ? AM IF/RF signal generator ? ? Solid-state voltmeter (SSVM) ? ? Regulated DC power supply ? ? 2-CH voltmeter ? ? Distortion meter

12、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 recept

13、acle 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 60dBV output 98.1 MHz 40 dB 98.1 MHz VR2 Stereo Separation 25 dB (5 dB) STOP SENS. Signal Generator to ant

14、enna 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