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Car Multimedia Centre
DDV 805
CONTENTS
Page
Disassembly Instructions ..................................................................................................................................... 3
Disassembly Diagram.......................................................................................................................................... 4
Disassembly Instructions TV7020 ................................................................................................................. 5
Disassembly Diagram TV7020 ...................................................................................................................... 6
Operation Check.................................................................................................................................................. 7
Block Diagram ..................................................................................................................................................... 8
Alignment Locations ............................................................................................................................................ 9
Alignment Procedures ....................................................................................................................................... 10
Printed Circuit Board.......................................................................................................................................... 11
Exploded View (Display).................................................................................................................................... 31
Exploded View Part List (Display)...................................................................................................................... 32
Exploded View (Unit) ......................................................................................................................................... 34
Exploded View Parts List (Unit) ......................................................................................................................... 35
Exploded View (TV7021) ................................................................................................................................... 37
Exploded View Part List (TV7021)..................................................................................................................... 38
Exploded View (Deck) ....................................................................................................................................... 39
Exploded View Part List (Deck) ......................................................................................................................... 40
Schematic Diagram ........................................................................................................................................... 42
Electrical Parts List ............................................................................................................................................ 54
Specifications..................................................................................................................................................... 74
2
DISASSEMBLY INSTRUCTIONS (UNIT)
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 Take out the Ring and remove two screws (A) from each side of the base then remove the Base.
3 Remove two screws (B) located on the Main Board left side of the side bracket.
Remove two screws (C) located on the Main Board Right side of the side bracket.
4 Remove two screws (F) located on the under of the deck front Bracket.
Remove two screws (G) located on the front of the deck front bracket then remove the Deck Bottom
Bracket.
5 Remove two screw (H) and the Wire Clip.
6 Remove the screws (I) from on the Rear of the under side bracket then remove heat sink.
Remove the screws (J) from on the Rear of the top side bracket then remove heat sink.
7 Remove two screws (K) from on the back of the Rear-right Cabinet then remove the DC FAN 12V and
The Fan Cover.
3
DISASSEMBLY DIAGRAM (UNIT)
4
DISASSEMBLY INSTRUCTIONS (TV7020)
1. Remove two screws (A) from each of the Top Cover then remove the Top Cover.
2. Remove four screws (B) from on the main board then remove the Bottom Cover and Main Board.
5
DISASSEMBLY DIAGRAM (TV7020)
6
OPERATION CHECK
GENERAL SPECIFICATIONS OF SIGNAL
Standard frequency FM 98.1 MHz (87.5, 108.0 MHz)
MW 1000 kHz (522, 1620 kHz)
Signal output FM 1 mV
MW 5 mV
Modulation MW 400 Hz 30% MOD.
FM Stereo 1 kHz 75 kHz DEV.
46% for L only or R
only pilot level 8%.
AF output level FM/MW
Power source voltage DC 14.4V (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.
Test Diagram
ACC (DV14.4V)
2-SPEAKER 4-SPEAKER 4-SPEAKER 2-SPEAKER
RR.
RL. SPK.
SPR. BACK UP (14.4V)
FRONT FRONT
SPK. SPK.
FL. FR.
SPK. SPE. GROUND
POWER ANTANNA
MAIN UNIT
ANT
MPX
DUMMY STEREOS
DISTORTION ANTANNA MODULATOR
METER VTVM VTVM
AM SG FM SG
7
BLOCK DIAGRAM (UNIT)
8
ALIGNMENT LOCATIONS
MITSUMI TUNER
9
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 98.1 MHz Adjust AF
Separation Generator Int. 1 kHz 98.1 MHz VR3 output power
to antenna Dev. 75 kHz at maximum
receptacle L+R = 90 % separating
pilot = 10 % more than 30 dB
FM SNC 98.1 MHz
Adjustment Dev. 75 kHz 98.1 MHz 98.1 MHz VR2 Stereo Separation
L+R=90 % @ 40 dB 25 dB (