Akai ACM 370 L Service Manual

Page 2

CONTENTS
-

SAFETY INSTRUCTIONS .......................... 2
INFORMATION ................................... 2
I. SPECIFICATIONS ............................ 4
II. CONTROLS .................................. 5
III. ADJUSTMENT
TAPE SPEED ADJUSTMENT ..................... 8
TURN TABLE SPEED ADJUSTMENT .............. 8
TUNER ADJUSTMENT .......................... 9
DISASSEMBLY PROCEDURES FOR CDP SECTION . 11
CD SECTION ................................... 12
IV. PARTS LIST
RECOMMENDED SPARE PARTS .................. 14
TURN TABLE BLOCK ............................ 15
CASSETTE MECHA BLOCK ...................... 17
CD MECHA BLOCK ............................. 19

...23
...25
..26

ASSEMBLY BLOCK .
BLOCK DIAGRAM

WIRING DIAGRAM (MAIN). .
WIRING DIAGRAM ICDP) ........................ 27
SCHEMATIC DIAGRAM (MAIN) B ................ 28

SCHEMATIC DIAGRAM (MAIN) E S . .29

SCHEMATIC DIAGRAM (TUNER) B E . .30
SCHEMATIC DIAGRAM (TUNER) s .31
SCHEMATIC DIAGRAM (CDP) .................... 32
SCHEMATIC DIAGRAM (TURNTABLE) ............ 33
PCBLAYOUT (MAIN) B ......................... 34
PCB LAYOUT (MAIN) E s ........................ 34

35
35

PCB LAYOUT (FRONT) B . . ..

PCB LAYOUT (FRONT) E S ......

PCB LAYOUT (HEAD PHONE, MIC JACK, EAKER
TERMINAL, REC LED, LED, ANT,
POWER SW) ........... . .36

PCB LAYOUT (CD, TX, TAPE SW) ........ . .37
PCB LAYOUT (POWER) B ............... 38
PCB LAYOUT (POWER) E S ...................... 38
PCB LAYOUT (CDP, DISPLAY, LAMP, REC/PB SW,

TUNER) .......................... 39

For Service Manuals Comact

MAURII'RON TECHNICAL SERVICES
5 Cherry Tree Rd, Chinnor
Oxon OX9 AQY

TGII- 01ߢ351694 Faxz- 013%352554
Email:- wuiries®mamitmmw4k

Page 5

I. SPECIFICATIONS

RADIO SECTION

Tuning Ranges : MW : 530-1610 KHz
LW : 153-344 KHz-
FM :87. 5- 108 MHz
Sensitivity : MW. : 1000;1V

LW : 2000 :V-
PM ~ 10 ,tv
Antennas : MW, LW: Loop

FM :75 Ohm antenna

CASSETTE SECTION

: AC bias : 85 KHZ

: Magnetic erase

: 4.75 cm/sec. (Normal),
9.5 cm/sec. (Hi-speed)

Recording System
Erasing System
Tape Speed

F. Forward Time : 120 sec.
Rewind Time : 120 sec.

Wow 6k Flutter : 0.3%
Frequency Response : 125 Hz- 10 KHz
S/N Ratio : 40 dB

TURN TABLE SECTION

Turn Table (Platter) : Plastic Mold, 280 mm
Diameter

Drive System : Belt Drive Semi-automatic

Motor : DC Servo Motor

Speed : 33-1/3 & 45 rpm

Wow & Flutter : 0.25% (Wrms)

Rumble : More Than 50 dB (Din-B)

Tone ARM ' .Static Balanced Straight Type

Effective ARM Length2198 mm

Cartridge . Moving Magnetic Type
(AT-3606. W/STYLUS)

Stylus : ATN 3606

Output Voltage : 2.5-5 mV

Channel Separation : More Than 18 dB
Optimal Stylus Pressure: 3«5 g
Weight . 0.5 Kg

MICROPHONE SECTION
Input Sensitivity : 2.5 mV/50 Kohms

GENERAL

Output Power
Power Source

: 2x25 w
:AC 240 me Hz B 5]
AC 220 V/50 Hail

CDP

System

CDP

: Compact disc digital

audio system

AUDIO CHARACTERISTICS

Frequency Response
Harmonic Distortion
S/N Ratio

Wow and Flutter
Channel Separation
Output Voltage Max.

FUNCTIONS

Instant Program
Selection

Index

Fast-Forward/ Back
Remain Time Display

Program Functions
Repeat

Program Reset

Pause

Disc Loading

. 20 Hz- 20 KHz

: Less than 0. 04% (1 KHZ)
: More than 90 dB

: Below measurable limits

: More than 80 dB (1 KHZ)
: 2 Vrms

: Sequential,

with SKIP (144 and DH)
buttons

: Sequential.

with SEARCH/INDEX
(>1 and H) buttons
(Stop mode only)

: Fast-forward/back with sound
: With TIME button

(during normal disc play only)

: 16 selections
: One track, All tracks,

All programmed tracks

: Press STOP button twice

(during programmed disc play)

: Each track
: Motor driven horizontal

loading

DIGITAL SIGNAL PROCESSING

Optical Pickup
Error Correction
Sampling Frequency
D/A Conversion
Filter

: 3-beam laser
: CIRC

: 44.1 KHz

: 16-bit linear

: Digital filter+

(4-pole LC filter)

*Specifications and design are subject to change without

notice.

Dimensions

: 350(W) x 422(H) x 351(D) mm

ForSarviee Manuals Contact
WHOM TECHNICAL SERVEES
8 Cherry Tree Rd, Chinnor
Oxon OX9 40Y
Tit-01844351694 Fax:- 01344-352554
Emil:- -enq1irie@maurilron. an. it

SERVICE MANUAL

Page 6

ll. CONTROLS

2-1 TURN TABLE (TOP)

For Service Manuals Contact
MAUHH'RON TECHNICAL SERV'CES
8 Cherry Tree Rd, Chinnor
Oxon 0X9 40V
Tel:- 01844-851694 Fax:- 01544525
Emaiiz- enquiries@mummtoom

2-2 REMOTE CONTROL

r-

-oo
_.
N

Before operating,
remove the screw 5.

-ga-

«wag-s

\._
._.
-

t -A~-~--~-t
r

Arm Lifter 7. POWER OFF Button
Cueing Lever 8. POWER ON Button
Cartridge 9. VOLUME DOWN Button

.OVFPPT

Speed Selector 10. VOLUME UP Button
Shipping Screw 11. PRESET SCAN START Button
Arm-Rest 12. PRESET SCAN STOP Button

13. Battery Cover

[BE

7. POWER ON/OFF

8. PRESET SCAN START Button
9. PRESET SCAN STOP Button
10. VOLUME DOWN Button

11. VOLUME UP Button

12. Battery Cover

SERVICE MANUAL

Page 20

CD MECHA BLOCK

Parts will nol be supplied if llley are not listed in [he pm: lisl. cven if may

appear on Ihe assembling illusumions with reference No.

NOTE:

SERVICE MANUAL

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