Akai ASR-95 User manual

SERVICE MANUAL
Model:
ASR95
AUTO REVERSE CAR STEREO
RADIO CASSETTE
PLAYER WITH PLL
SYNTHESIZED TUNING
FULL DETACHABLE PANEL
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CONTENTS
Page
DisassemblyInstructions .................................................................................................................................3
DisassemblyDiagram ......................................................................................................................................4
Operation Check ..............................................................................................................................................5
Block Diagram..................................................................................................................................................6
Alignment Locations.........................................................................................................................................7
Alignment Procedures......................................................................................................................................8
Printed Circuit Boards ......................................................................................................................................9
Wiring Diagram ............................................................................................................................................12
Exploded View (Panel)...................................................................................................................................13
Exploded View PartsList (Panel)...................................................................................................................14
Exploded View (Cabinet)................................................................................................................................15
Exploded View PartsList (Cabinet)................................................................................................................16
Schematic Diagram........................................................................................................................................17
Electrical Parts List.........................................................................................................................................18
Specifications .................................................................................................................................................21
2

DISASSEMBLY INSTRUCTIONS
1. Using the unlock keythat came with the unit or a similar tool, unlockthe Mounting Boxand remove
toward the rear of the unit.
2. Remove the screw (A)located on the back ofthe top cabinet then remove the Top Cabinet.
3. Open the panel and remove the Trim Ring then remove two screws (B) fromthe Base.
4. Remove two screws(C) each side ofthe base then remove the Base.
5. Remove the screw(D)and remove the Antenna Clip.
6. Remove two screws(E) and remove the Wire Clip.
Remove two screws(F) fromthe Heat Sinkthen remove the Clip (A).
7. Remove two screws(G) fromthe deck front bracket and remove two screws (H) from the deck rearbracket
cabinet.
8. Remove two screws(I)from under the bottomcabinet and remove the DeckFront Bracket.
Remove two screws(J)fromunder the bottomcabinet then remove the Deck and the DeckRear Bracket.
9. Remove two screws(K) from the heat sinkthen remove the Main Board.
10. Remove two screws(L) fromthe heat sinkthen remove the Heat Sinkand the BottomCabinet.
3

DISASSEMBLY DIAGRAM
4

OPERATION CHECK
GENERAL SPECIFICATIONS OF SIGNAL
Standard frequency
Signal output
Modulation
FM
MW
LW
FM
MW
LW
MW
FMStereo
98.1 MHz(87.5, 108 MHz)
1000 kHz(522, 1620 kHz)
200 kHz(144, 288kHz)
1mV
5 mV
5 mV
400 Hz30% MOD.
1 kHz75 kHzDEV.
90% for L onlyor
R onlypilot level 10%
AF output level FM/MW/LW
Power source voltage DC 14.0V(Backup voltage isthe 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
5

BLOCK DIAGRAM
6

ALIGNMENT LOCATIONS
FM/AM TUNER
7

ALIGNMENT PROCEDURES
FM ADJUSTMENT
EquipmentRequired
lAM IF/RF signal generator
lSolid-state voltmeter (SSVM)
lRegulated DC power supply
l2-CH voltmeter
lDistortion meter
FM AlignmentUsing FM Signal Generator
Note: Pressthe radio power switch to on the radio. Signal generatoroutput must be kept aslowas 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 than30 dB
FMSNC
Adjustment
98.1 MHz
Dev. 75 kHz
L+R=90 %
Int. 1 kHz
60dB Voutput
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
dev75kHz
98.1 MHz VR3
Adjust AF to stop
station.
Note: The tuner module is well-adjust and adjustmentis not recommended.
8

PRINTED CIRCUIT BOARDS
MAIN BOARD
9

KEY BOARD
TOP VIEW
10