Roadstar CD-910DVD Manual de usuario

Service Manual - CD-910DVD

CD-910DVD

Service Manual - CD-910DVD

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

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.

DISASSEMBLY DIAGRAM

OPERATION CHECK

GENERAL SPECIFICATIONS OF SIGNAL

Standard frequency

Signal output

Modulation

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%forLonlyorR

onlypilotlevel8%.

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.

TestDiagram

4-SPEAKER

VTVM

DISTORTION

METER

2-SPEAKER

FRONT

SPK.

FL.

RL.

SPR.

MAIN UNIT

AM SG

VTVM ANTANNA

DUMMY

FM SG

MODULATOR

STEREOS

MPX

ANT

FRONT

SPK.

SPE.

FR.

RR.

4-SPEAKER

SPK.

2-SPEAKER

POWER ANTANNA

ACC (DV14.4V)

GROUND

BACK UP (14.4V)

BLOCK DIAGRAM

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.

10.7 MHz

Sweep output

30dB/µV

98.1 MHz T102 Adjust so that

maximum AF

output power and

minimum

distortion

76 kHz pilot

Modulation

Signal generator

to antenna

receptacle

75 kHz Dev.

90% for L only

or R only pilot

level 10%

98.1 MHz VR2 Adjust to

76 kHz

Stereo

Separation

Signal

Generator to

antenna

98.1 MHz

int. 1 kHz

Dev. 75 kHz

L + R = 92%

Pilot = 8%

98.1 MHz VR1 Adjust AF

Output power

For maximum

Separation

Note: The tuner module is well-aligned and adjustment is not recommended

AM IF/RF ADJUSTMENT

Equipment required

zAM IF/RF signal generator

zSolid-state voltmeter (SSVM)

zRegulated DC power supply

z2-CH voltmeter

zDistortion 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

Generator Display

Setting

Adjustment Remark

IF AM RF

Signal

Generator to

Antenna.

450 kHz Sweep

Output

60dB/µV

530 kHz T101 Adjust so that

maximum left and

right are

symmetrical

FREQ.

Low

FREQ.

High

530 kHz

1710 kHz

T106

CT103

RF Signal

Generator

to antenna

receptacle

600 kHz Int.

400Hz 30%

Mod output

20dB/mV

600 kHz T107

CT102

Adjust AF output

power for

maximum

Count

Signal Generator

To antenna

receptacle

1000kHz Int.

400Hz 30% mod.

Output 20 dB/mV

1400 kHz VC101 Adjust AF output

power for

maximum

Note: The tuner module is well-aligned and adjustment is not recommended.

PRINTED CIRCUIT BOARDS

MAIN BOARD

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