Roadstar DT-965LCD Service Manual
R
- DT-956LCD
- DT-956LCD
DT-956LCD
Service Manual
Service Manual
CONTENTS
Page
Disassembly Instructions ..................................................................................................................................... 3
Disassembly Diagram.......................................................................................................................................... 5
Block Diagram ..................................................................................................................................................... 7
Alignment Locations ............................................................................................................................................9
Alignment Procedures .......................................................................................................................................10
Printed Circuit Board.......................................................................................................................................... 12
Exploded View (Display).................................................................................................................................... 31
Exploded View Part List (Display)......................................................................................................................32
Exploded View (Unit) ......................................................................................................................................... 34
Exploded View Parts List (Unit) ......................................................................................................................... 35
Exploded View (Radio Box)...............................................................................................................................36
Exploded View Part List (Radio Box)................................................................................................................. 37
Schematic Diagram ...........................................................................................................................................38
Electrical Parts List ............................................................................................................................................ 51
Specifications..................................................................................................................................................... 63
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 Cabinet Bottom.
3. Remove six screws (A) from on the power board then remove the Power Board; The Left Support; The Right
Support and the Main Board.
4. Take out the Ring and remove two screws (B) from each side of the base then remove the Base.
5. Remove two screws (C) from on the front support and remove two screws (D) from the rear support.
6. Remove three screws (E) and remove the Front Support.
Remove two screws (F) and remove the Deck and the Rear Support.
7. Remove eight screws (G) from each side of the cabinet top then remove the Rock; The Display and the
Cabinet Top.
3
DISASSEMBLY INSTRUCTIONS (RADIO BOX)
1. Remove six screws (A) from each side of the box top the remove the Antenna Socket and the 22PIN Socket.
2. Remove the screws (B) from on the Heat Sink for Box then remove the RDS Box Top.
3. Remove two screws (C) from on the Heat Sink for Box then remove the IC Bracket and the Heat Sink For
Box.
4. Remove four screws (D) from on the main board then remove the Main Board and the Box Bottom.
4
DISASSEMBLY DIAGRAM (UNIT)
5
DISASSEMBLY DIAGRAM (RADIO BOX)
6
BLOCK DIAGRAM (DVD)
7
BLOCK DIAGRAM (RADIO BOX)
8
LA1787 FM/MWLW TUNER
ALINGMENT LOCATIONS
9
ALIGNMENT PROCEDURES
FM ADJUSTMENT
Equipment Required
z AM IF/RF signal generator
z Solid-state voltmeter (SSVM)
z Regulated DC power supply
z 2-CH voltmeter
z 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
Coupling
Stereo
Separation
FM SNC
Adjustment
STOP
SENS.
Note: The tuner module is well-adjust and adjustment is not recommended.
Signal
Generator
to antenna
receptacle
98.1 MHz
Dev. 75 kHz
L+R=90 %
Int. 1 kHz
60dBµV output
Signal Generator
to antenna
receptacle
Generator Display
Setting
98.1 MHz
Int. 1 kHz
Dev. 75 kHz
L+R = 90 %
pilot = 10 %
98.1 MHz
@ 40 dBµ
98.1 MHz
Mod. 1kHz
Dev 75kHz
98.1 MHz VR1
98.1 MHz VR3
98.1 MHz
Adjustment Remarks
Adjust AF
output power
at maximum
separating
more than 30 dB
Stereo Separation
25 dB (±5 dB)
VR4
Adjust AF to stop
station.
10
AM ADJUSTMENT
Equipment Required
z MW IF/RF signal generator
z Solid-state voltmeter (SSVM)
z Regulated DC power supply
z 2-CH voltmeter
z Distortion meter
MW Alignment Using AM 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
MW
Seek
SENS.
Note: The tuner module is well-adjust and adjustment is not recommended.
Generator
Coupling
Signal Generator
to antenna
receptacle.
Generator
1000 kHz
Input level
25 dBµV
Display
Setting
1000 kHz VR2 Adjust AF
Adjustment
Remarks
Stop station.
11
MAIN BOARD
PRINTED CIRCUIT BOARDS
TOP VIEW
12
MAIN BOARD
BOTTOM VIEW
13
KEY BOARD
TOP VIEW
14
KEY BOARD
BOTTOM VIEW
15
MONITOR KEY BOARD
TOP VIEW
16
MONITOR KEY BOARD
BOTTOM VIEW
17
CD SERVO BOARD
TOP VIEW
18
CD SERVO BOARD
BOTTOM VIEW
19
POWER BOARD
TOP VIEW
20
POWER BOARD
BOTTOM VIEW
21
REMOTE BOARD
TOP VIEW
22
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