Roadstar CD-910DVD Service Manual
R
- CD-910DVD
- CD-910DVD
CD-910DVD
Service Manual
Service Manual
CONTENTS
Page
Disassembly Instructions ..................................................................................................................................... 3
Disassembly Diagram.......................................................................................................................................... 4
Operation Check..................................................................................................................................................5
Block Diagram ..................................................................................................................................................... 6
Alignment Locations ............................................................................................................................................7
Alignment Procedures .........................................................................................................................................8
Printed Circuit Boards........................................................................................................................................ 10
Wiring Diagram .................................................................................................................................................. 17
Exploded Views (Panel)..................................................................................................................................... 18
Exploded View Parts Lists (Panel)..................................................................................................................... 19
Exploded Views (Cabinet) ................................................................................................................................. 20
Exploded View Parts Lists (Cabinet) ................................................................................................................. 21
Schematic Diagram ...........................................................................................................................................23
Electrical Parts List ............................................................................................................................................ 29
Specifications..................................................................................................................................................... 34
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
Rear of the unit.
2. Remove two screws (A) located on the Cabinet Top then remove the Cabinet Top.
3. Remove two screws (B) located on the Cabinet Bottom then remove the Cabinet Bottom.
4. Remove two screws (C) (one located at the left side and one located at the right side of the front cabinet) then
remove two Hooks.
6. Remove the screw (D) from on the left side of the left bracket and remove the screw (E) from on the right side
of the right bracket.
7. Remove two screws (F) from on the rear bracket then remove the Deck.
8. Take Out the Panel and the Ring.
Remove two screws (G) from each side of the base then remove the Base.
9. Remove two screws (H) from on the right bracket then remove the Tooth Bracket and the Tune Top Tooth.
Slide off the Nut and the Stop Washer then remove the Brass Bush and the Tuning Shaft /Tuner.
9. Remove the screw (I) and two screws (J) from on the right bracket then remove the Tune FIX Support.
Remove the screw (K) from on the right bracket and remove three screws (L) from under the right bracket and
remove the 2BND Tuner and the Tuner Support.
10. Remove two screws (M) from on the back of the rear bracket and Slide off two Nuts then remove the DC FAN
12V.
Remove five screws (N) from on the back of the heat sink then remove the Heat Sink and the Heat Sink
Adaptor.
Remove two screws (O) from on the back of the rear bracket then remove the 22PIN Socket.
11. Remove the screw (P) from on the left bracket then remove the Transistor Holder.
12. Remove three screws (Q) from under the main board then remove the Main Board.
13. Remove two screws (R) from on the left bracket then remove the Left Bracket.
14. Remove two screws (S) from the right bracket then remove the Right Bracket and the Rear Bracket.
3
DISASSEMBLY DIAGRAM
4
OPERATION CHECK
GENERAL SPECIFICATIONS OF SIGNAL
Standard frequency
Signal output
Modulation
FM
MW
FM
MW
MW
FM Stereo
98.1 MHz (87.5, 108 MHz)
1000 kHz (522, 1620 kHz)
1 mV
5 mV
400 Hz 30% MOD.
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
2-SPEAKER
FRONT
SPK.
4-SPEAKER
RL.
SPR.
FL.
SPK.
4-SPEAKER
RR.
SPK.
FR.
SPE.
2-SPEAKER
FRONT
SPK.
ACC (DV14.4V)
BACK UP (14.4V)
GROUND
POWER ANTANNA
MAIN UNIT
ANT
MPX
STEREOS
MODULATOR
DISTORTION
METER
VTVM
VTVM
DUMMY
ANTANNA
AM SG
FM SG
5
BLOCK DIAGRAM
6
ALIGNMENT AND PROCEDURES
FM IF/RF ADJUSTMENT
Equipment required
● FM IF/RF signal generator
● Oscilloscope
● FM Stereo signal generator
● Solid-state voltmeter (SSVM)
● Regulated DC power supply
● Distortion meter
FM IF and RF 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 dipping
Step Generator
Coupling
Generator
Setting
Display
Setting
Adjustment Remark
IF FM RF signal
Generator to
Antenna
Input.
76 kHz pilot
Modulation
Stereo
Separation
Note: The tuner module is well-aligned and adjustment is not recommended
Signal generator
to antenna
receptacle
Signal
Generator to
antenna
10.7 MHz
Sweep output
30dB/µV
75 kHz Dev.
90% for L only
or R only pilot
level 10%
98.1 MHz
int. 1 kHz
Dev. 75 kHz
L + R = 92%
Pilot = 8%
98.1 MHz T102 Adjust so that
98.1 MHz VR2 Adjust to
98.1 MHz VR1 Adjust AF
maximum AF
output power and
minimum
distortion
76 kHz
Output power
For maximum
Separation
7
AM IF/RF 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
AM IF and RF Alignment Using AM Signal Generator
Note: Press the power switch to on the radio. Signal generator output must be kept as low as possible to avoid
overload and clipping
Step Generator
Coupling
IF AM RF
Signal
Generator to
Antenna.
FREQ.
Low
FREQ.
High
RF Signal
RF
Count
530 kHz
Generator
to antenna
receptacle
Signal Generator
To antenna
receptacle
Note: The tuner module is well-aligned and adjustment is not recommended.
Generator Display
Setting
450 kHz Sweep
Output
60dB/µV
600 kHz Int.
400Hz 30%
Mod output
20dB/mV
1000kHz Int.
400Hz 30% mod.
Output 20 dB/mV
530 kHz T101 Adjust so that
1710 kHz
600 kHz T107
1400 kHz VC101 Adjust AF output
Adjustment Remark
T106
CT103
CT102
maximum left and
right are
symmetrical
Adjust AF output
power for
maximum
power for
maximum
8
MAIN BOARD
PRINTED CIRCUIT BOARDS
TOP VIEW
9
MAIN BOARD
BOTTOM VIEW
10
KEY BOARD
TOP VIEW
11
KEY BOARD
BOTTOM VIEW
12
DISPLAY BOARD
TOP VIEW
13
DISPLAY BOARD
BOTTOM VIEW
14
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