Text preview for : MMD-888 Service Manual.pdf part of MYSTERY MMD-888 Service Manual . Rare and Ancient Equipment MYSTERY Car Audio Mystery MMD-888 MMD-888 Service Manual.pdf
Back to : MMD-888 Service Manual.pd | Home
R
PLL SYNTHESIZER STEREO RADIO WITH
DVD/VCD/MP3/CD PLAYER DIGITAL
MODE:MMD-888
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)......................................................................................................15
Exploded View Parts Lists (Panel).......................................................................................16
Exploded Views (Cabinet).................................................................................................. 17
Exploded View Parts Lists(Cabinet).................................................................................... 18
Schematic Diagram............................................................................................................19
Electrical Parts List............................................................................................................25
Specifications....................................................................................................................29
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 read of the unit.
2. Remove two screws (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 Cabint.
4. Remove two screw (C) and (D) from the side bracket of the right side.
Remove the screw (E) and (F) from the side bracket of the left side.
5. Remove two screws (G) from the base of the front side then remove the two screws (H) loated unit
the front desk bracket then remove the Front Dect Bracket.
Remove two screws (I) located under the rear deck bracket then remove the Rear Deck Bracket.
6. Remove two screws (J) from the Heat Sink then remove the Spring Sheet.
7. Remove five screws (K) from the Heat Sink then remove the Heat Sink.
8. Remove two screws (L) located on the side bracket of the rear side then remove the ISO Antenna
Socket/Shore W/Holder.
9. Remove the screw (M) located on the side bracket of the rear side.
Remove two screws (N) located on the main board then remove the Heat Sink (7809/DB435).
10. Remove the screw (O) located on the side bracket of the rear side then remove the 22PIN socket.
11. Take out the Panel and the Ring.
Remove two screws (P) from each side of the base then remove the Base.
12. Remove the screw (Q) located under the main board then remove the Main Board.
3
DISASSEMBLY DIAGRAM
4
OPERATION CHECK
GENERAL SPECIFICATIONS OF SIGNAL
Frequency range FM 87.5, 108 MHz
AM 522-1620 KHz
OIRT FM 65-74MHz
Intermediate frequency FM 10.7 MHz
AM 450 kHz
Practicality neat(S/N 30dB) FM Less than 22dB
Practicality neat(S/N 20dB) AM Less than 48dB
Frequency Character 5-20,000Hz (+2dB)
Signal/Noise Ratio 70dB(1KHz)(1EC-A Network)
Channel 2 channels (stereo)
Power 12-13.8V, -earth
The signal strength read in this section is voltage on the antenna.
Test Diagram
UNIT
ANTENNA
Brown
SIDE BRAKE
B+ 12V Brown/white
BACK CAMERA POWER Blue
VIDEO CONTROL ANTENNA Pink
Black DIMMER CONTROL
L(White) AMPLIFIER Blue/White
AUX LINE INPUT CONTROL 10A Yellow B+ + -
Black
R(Red) Red
ACC + Black B-
SUBWOOFER Green +
+ White Grey
(Green) FRONT FRONT
Brown L SP R SP
L(White) - White/Black Grey/Black -
RCA LINE OUTPUT Brown
R(Red) + Green Purple +
REAR REAR
VIDEO INPUT Yellow L SP R SP
(Yellow) - Green/Black Purple/Black -
VIDEO OUTPUT Black
(Yellow)
5
BLOCK DIAGRAM
6
ALIGNMENT LOCATIONS
FM/MW/LW 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 98.1MHz Adjust AF
separation Generator Int. 1 khz 98.1MHz VR1 output power
to antenna Dev. 75 khz at maximum
receptacle L+R = 90 % separating
Pilot = 10 % more than 30 dB
FM SNC 98.1MHz
Adjustment Dev. 75 khz 98.1MHz VR2 Stereo Separation
L+R=90% @ 25 dB (+5dB)
Int. 1 khz
60dBuV output
Stop Signal Generator 98.1 Mhz
Adjust AF to
SENS. To antenna Mod. 1kHZ 98.1MHz VR3
stop station.
receptale Dev 75kHz
Note: The tuner module is well-adjust and adjustemnt is not recommended.
8
PRINTED CIRCUIT BOARDS
MAIN BOARD
TOP VIEW
9
MAIN BOARD
BOTTOM VIEW
10
KEY BOAR
TOP VIEW
11
KEY BOARD
BOTTOM VIEW
12
SERVO BOARD
TOP VIEW
13
SERVO BOARD
BOTTOM VIEW
14
EXPLODED VIEW
PANEL
15
EXPLODED VIEW PARTS LIST
16
EXPLODED VIEW
CABINET
17
EXPLODED VIEW PARTS LIST
CABINET
18
19
1000uF/16V
1000uF/10V
13
SGND
6
C44 47uF 10
SVR
C123 474 1
TAB
16
ACGND
C124 474 20
25
HSD
3
2
1
104 C84
47uF C42
2 3
A
K
0.5A
FUSE1
FUSE3 0.5A
FUSE2
0.5A
ZD14 12V
C125 1000U
KB12V LAMP CONTROL
BATT
SCHEMATIC DIAGRAM(MAIN BOARD)
20
1
2
CLOSE
3
OPEN
4
5
CVBS
6
TV-GND
7
VIDEO_R
8
VIDEO_G
9
VIDEO_B
10
11
AUDIO_CE
12
AUDIO_SW
13
AUDIO_SL
14
AUDIO_SR
15
AUDIO_FL
16
AUDIO_FR
17
18
AUDIO_DL
19
AUDIO_DR
20
21
OUT_SW
22
DISK_SW
23
IN_SW
24
25
XMD
26
XMC
27
XCS
28
POWER_CON
29
30
R87 22K
R96 22K
33 16
P3.5/URXD0 P1.4/SMCLK
34 15
P3.6 P1.3/TA2
35 14
P3.7 P1.2/TA1
36 13
P4.0/TB0 P1.1/TA0
37 12 SW01
P4.1/TB1 P1.0/TACLK
38 11
P4.2/TB2 VREF-/VeREF-
39 10
P4.3 VeREF+
40 9
P4.4 XOUT/TCLK
41 8
P4.5 XIN
42 7
P4.6 VREF+
43 6 TA
P4.7/TBCLK P6.7/A7
44 5 TB
P5.0 P6.6/A6
45 4
P5.1 P6.5/A5
46 3
P5.2 P6.4/A4
47 2
P5.3 P6.3/A3
48 1
P5.4/MCLK DVCC
X OUT
3.3V
P1.1
P2.2
KB12V
KB_12V
P N LC N E T R
A E O N CO
SCHEMATIC DIAGRAM(MAIN BOARD)
SCHEMATIC DIAGRAM(MAIN BOARD)
8 4 8 4 8 4
21
SCHEMATIC DIAGRAM(MAIN BOARD)
8 4
6
5
4
3
2
1
22
SCHEMATIC DIAGRAM(MAIN BOARD)
2
1
8 4
15
14 8
13 7
12 6
2 9
1
23
24
Control Circuit
R73 47K
2
R74 47K
R75 47K
+3V3A
P_TRAP
1 48
2 47
3 46
N_TRAP ROUT
4 45
5 44
GOUT
6 43
7 42
8 41
BOUT
9 40
CE
10 39
R35100R
DATA PCD
11 38
SCLK
R37100R 12 37
13 36
14 35
ENB
15 34
XENB
16 33
BS2 TO DISPPLAY
Y_SIG
2
GND
2
GND
1
1
Display Circuit
ELECTRICAL PARTS LIST
* * * * * * * *KB board part* * * * * * *
Spare Number Spare Name Spare Specification Quantity Location
001-001117-033 IC AMS1117- 3. 3V 1 U4
001-004053-001 IC 74HC4053M TSSOP-16 SMD 1 U5
001-018P24-001 IC MTV018P24-04 SO-24 SMD 1 U7
001-001380-001 IC AT1380AP tssop8 1 U6
001-004137-001 IC IV4137W SQFP64 1 U3
001-002651-001 IC LM2651MTC-ADJ 1 U2
002-002020-002 RED LED BLUE 0805 SMD 1 LD1
002-003020-06A SMT LED BLUE 0805 SMD 5 LD2-5,LED1a
002-005817-001 DIODE 5817 D-58X SMD 1 D1
002-005819-001 DIODE 5819 D-58X SMD 2 D2,3
003-003904-001 AUDION 2N3904 SOT-23 SMD 1 Q1
003-003400-001 AUDION AO3400 SOT-23 SMD 1 Q2
003-000411-001 AUDION RB411D SOT-23 1 D6
004-000443-004 Crystal Flap 4.433619MHz 49SS SMD 1 X2
004-000358-004 Crystal Flap 3.579545MHz 49SS SMD 1 X1
005-005160-020 CHIP CAP 16P/50V 0603