Akai ACR-127MMC User manual

SERVICE MANUAL
Model:
ACR127MMC
CD/MP3–RECIVER
www.akai.ru

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
Exploded Views (Panel) ...................................................................................................................................... 18
Exploded View Parts Lists (Panel) ...................................................................................................................... 19
Exploded Views (Cabinet) ................................................................................................................................... 20
Exploded View Parts Lists (Cabinet) ................................................................................................................... 21
Exploded Views (Deck) ....................................................................................................................................... 23
Exploded View Parts Lists (Deck) ....................................................................................................................... 24
Schematic Diagram ............................................................................................................................................. 26
Electrical Parts List .............................................................................................................................................. 29
Specifications....................................................................................................................................................... 36

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 two screws (A) located on the rear of the top cabinet then remove the Top Cabinet.
3. Remove two screws (B) located on the rear of the bottom cabinet then remove the Bottom Cabinet.
4. Take out the Front Panel and the Ring.
Remove the screws (C) from on the front side of the Base.
5. Remove two screws (D) from on the right side of the side bracket.
Remove two screws (E) from on the left side of the side bracket.
6. Remove two screws (F) from under the deck front bracket then remove the Deck Front Bracket.
Remove two screws (G) from under the deck rear bracket then remove the Deck Rear Bracket and the
Deck.
7. Remove the screw (H) from on the right side of the side bracket then remove the IC Bracket.
8. Remove two screws (I) from on the left side of the heat sink then remove the Spring Sheet.
9. Remove three screws (J) from on the left side of the heat sink then remove the Heat Sink.
10. Remove the screw (K) from on the back of the side bracket and remove two screws (L) from on the main
board then remove the Heat Sink (7809/DB435).
10. Remove two screws (M) from on the back of the side bracket then remove Wire Clip.
11. Remove two screws (N) from each side of the base then remove the Base.
12. Remove three screws (O) from under the main board then remove the Side Bracket and the Main Board.
13. Remove two screws (P) from under the main board then remove the two SD PCB Bracket an the SD PCB
Board.

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
5 mV
5 mV
400 Hz 30% MOD.
1 kHz 75kHz DEV.
46% for L only or
Ronlypilotlevel8%
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 TUNER BOARD

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
TOP VIEW

10
MAIN BOARD
BOTTOM VIEW

11
KEY BOARD
TOP VIEW

12
KEY BOARD
BOTTOM VIEW

13
CD SERVO BOARD
TOP VIEW

14
CD SERVO BOARD
BOTTOM VIEW

15
FRONT/EJ BOARD
TOP VIEW

16
FRONT/EJ BOARD
BOTTOM VIEW

17
SD CARD PCB BOARD

18
EXPLODED VIEW
PANEL

19
EXPLODED VIEW PARTS LIST
PANEL
Ref. No. Description RS Part No. Mfr’s Part No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
Lens; (OPC0000) LCD X59.16 N/IR/SW
Panel –F (OP2001/White) LCD X60.16 “USB”
Panel Bottom (F)
VOL Knob (E. Silver)
Round Decoration (E-Silver)
Open Key (L-Up) (OP0000)
RE Knob Spring
Power Knob (L-Up) (OPC0000)
RE Slide Spring
Decoration 01 (OPC0000)
Decoration 02 (OPC0000)
Decoration With USB (S. OPC0000)
USB Cover (Black)
SET Knob (OPC0000)
MUT/LOC/MON Key (L-Up) (OPC0000)
1PAU/3RPT/5 Key (L-Up) (OPC0000)
2SCN/4SHF/6 Key (L-Up) (OPC0000)
MD Key (Crystal/Purple PMS2572C)
Adaptor 01
BND/EQ Key (L-Up) (OPC0000)
0 DSP Key (L-Up) (OPC0000)
8TUNE SKIP/9TUNE SKIP Key (L-Up) (OPC0000)
AMS Key (Crystal/Purple PMS2572C) 2175
Adaptor 02
B-Light 01
B-Light 02
B-Light 03
Key Board
CD115 ROTATE ENCODER VOL
LCD Cover
CD-158 TN NGE M. Color PIN TYPE
LED B.L. QB02002-09 23.5X99 WHT
Axis Post
Right Side Block
Contact Spring
Left Side Block
E-Ring Ø1.5X4X0.4 MM
Screw Ø1.7X4 PH/ST
Screw Ø2X8 BA/ST Black
53-J2122-333
51-J2121-31A
51-J2137-00
52-J2130-90E
52-J2131-90E
52-J2147-30
36-11852-00
52-J2135-01
36-11851-00
52-J2133-30
52-J2136-30
52-J2141-31W
52-J2063-00
52-J2134-30
52-J2124-32A
52-J2125-01
52-J2126-01
52-C2536-51P
52-J2138-00
52-J2129-03
52-J2128-01
52-J2127-01
52-C2537-52P
52-J2140-00
52-J2142-00
52-J2143-00
52-J2145-00
11-21750-318
18-00115-00
39-E2104-01
27-01580-01Y
02-A1560-09
34-24601-00
52-E2128-00
36-78008-00
52-E2129-00
35-00001-00
40-11704-00
40-12008-21

20
EXPLODED VIEW
CABINET