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Roadstar
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CD-804MPBT
Service Manual
40 pgs3.91 Mb0

Roadstar CD-804MPBT Service Manual

R
- CD-804MPBT
- CD-804MPBT
CD-804MPBT
Service Manual
Service Manual
CONTENTS
Page
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) ..................................................................................................................................... 24
Exploded View Parts Lists (Deck) ..................................................................................................................... 25
Schematic Diagram ...........................................................................................................................................27
Electrical Parts List ............................................................................................................................................ 31
Specifications..................................................................................................................................................... 40
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 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 Cabinet.
4. Remove the screw (C) from on the front side of the base.
5. Remove two screws (D) from on the right side of the rear bracket.
Remove the screw (E) and the screw (F) from on the left side of the side bracket.
6. Remove two screws (G) from under the front deck bracket then remove the Front Deck Bracket.
Remove two screws (H) from under the rear deck bracket then remove the Rear Deck Bracket.
7. Take out the Panel and remove the Ring.
Remove two screws (I) from each side of the base then remove the Base.
8. Remove two screws (J) from on the Heat Sink then remove the Spring Sheet.
9. Remove five screws (K) from on the Heat Sink then remove the Heat Sink.
10. Remove the screw (L) from on the back of the side bracket then remove the Antenna Clip.
11. Remove the screw (M) from on the back of the side bracket.
Remove two screws (N) from on the main board then remove the Heat Sink (7809/DB435).
12. Remove two screws (O) from on the back of the side bracket then remove the Wire Clip.
13. Remove the screw (P) from on the right side of the side bracket then remove the IC Mounting Bracket.
14. Remove three screws (Q) from under the main board then remove the Main Board.
3
DISASSEMBLY DIAGRAM
4
OPERATION CHECK
GENERAL SPECIFICATIONS OF SIGNAL
Standard frequency
Signal output
Modulation
AF output level FM/AM
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.
Test Diagram
2-SPEAKER
FRONT SPK.
FM
AM
FM
AM
AM
FM Stereo
4-SPEAKER
RL. SPR.
FL. SPK.
4-SPEAKER
RR. SPK.
FR. SPE.
98.1 MHz (87.5, 107.9 MHz)
1000 kHz (530, 1710 kHz)
1mV
5 mV
400 Hz 30% MOD.
1 kHz 75kHz DEV.
46% for L only or
R only pilot level 8%
2-SPEAKER
FRONT SPK.
ACC (DV14.4V)
BACK UP (14.4V)
GROUND
DISTORTION METER
VTVM
VTVM
DUMMY ANTANNA
AM SG
MAIN UNIT
FM SG
POWER ANTANNA
ANT
MPX STEREOS MODULATOR
5
BLOCK DIAGRAM
6
FM/MW/LW TUNER
ALIGNMENT LOCATIONS
7
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
IF FM RF Signal
Generator to
Antenna
input.
76 kHz
Pilot
Modulation
-3 dB
Limiting
Sens.
FM SNC
Adjustment
FM Stereo
S/N
Auto Stop
Sens.
Note: The tuner module is well-adjust and adjustment is not recommended.
Signal
Generator
to antenna
receptacle
Signal
Generator
to antenna
receptacle
98.1 MHz
Dev. 45 kHz
L+R=90 %
Int. 1 kHz
60dBµV output
Signal Generator
Connected to
Antenna
Signal Generator
Connected to
Antenna.
Generator Display
10.7 MHz
Sweep
output
60 dBµV
75 kHz Dev
45% for L only
or R only pilot
level 10%
60 dBµV
Output.
98.1 MHz
@ 40 dBµ
98.1MHz
Int. 1kHz
Dev. 75kHz.
98.1 MHz
Int. 1kHz
Dev. 75kHz
28 dBµV
Adjustment Remarks
Setting
98.1 MHz T101
98.1 MHz VR105 Adjust to
98.1 MHz VR101
98.1 MHz VR106
98.1MHz VR104
98.1 MHz VR107
Adjust so that
maximum AF
output power and
minimum distortion
76 kHz
Adjust VR101
Making –14dB
(±2dB) Limiting
Sensitivity.
VOR - VOL = 10 dB
(± 3 dB)
Adjust VR104 FM
Stereo S/N is the
optimum.
Adjustment
AF to stop station.
8
MAIN BOARD
PRINTED CIRCUIT BOARDS
TOP VIEW
9
MAIN BOARD
BOTTOM VIEW
10
FM TUNER BOARD
11
KEY BOARD
TOP VIEW
12
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