Roadstar CDR-4611 UDMP Service Manual

Service Manual

- CDR-4611 UDMP

Service Manual

- CDR-4611 UDMP

R

CDR-4611 UDMP

SERVICE MANUAL

CONTENTS

1. SPECIFICATIONS

2. CD TEST

3. BLOCK DIAGRAM

4. SAFETY CHECK

5. CD PLAYER CHECKING PROCEDURE

6. TROUBLE SHOOTING

7. SCHEMATIC DIAGRAM

8. PCB LAYOUT

9. EXPLODE VIEW

10. BILL OF MATERIAL

SPECIFICATIONS

Power source : AC 230V
Load impedance : 4 ohm
Reference output : 50 mW

BAND: AM 1 kHz 30% MOD.

Characteristic Unit Nominal Limit

Frequency
Range

Low
High

kHz
kHz

525
1645

±25

±30
Intermediate Frequency kHz 455 ± 2
20 dB S/N
Sensitivity

1000 kHz
600 kHz
1400 kHz

dB/M
dB/M
dB/M

61
60
61

65

66

65
S/N at 5 mV/m Input

600 kHz
1000 kHz
1400 kHz

dB
dB
dB

45
45
45

40

40

40
Selectivity ± 10 kHz dB 35 ± 20

BAND: FM 1 kHz 22.5 kHz DEV.

Characteristic Unit Nominal Limit

Frequency
Range

Low
High

MHz
MHz

87.5

108.5

±0.5

±0.5
Intermediate Frequency

MHz 10.7 ± 0.1
30 dB S/N
Sensitivity

90 MHz
98 MHz
106 MHz

dB/M

dB/M

dB/M

18
18
18

23
23

23
S/N at 1MV
Input 22.5 kHz
Deviation

90 MHz
98 MHz
106 MHz

dB
dB
dB

45
45
45

40

40

40

CD

Item Unit Nominal Limit

Frequency Response 100 Hz dB -3 ±3

20kHz dB -3 ±3
S/N W/IEC-A & LPF. dB 50 40
Interruption µm 1000 600
Black Dot µm 800 600
Eccentricity µm

70

Channel Separation (W/Band Pass Filter) dB 35 30

BLOCK DIAGRAM

ANT

IC1
AM/FM
TA2111

FUNCTIONS

TRANSITION

POWER AMP

IC7

TA8227

SPEAKER

L/R

CD SERVO

CD MECH

KEY

LCD

SAFETY CHECKS

Important Note!!! Do the following safety checks after servicing this unit.

1. Remove all the externally connected test equipment and wires before testing the unit.

2. Use the safety test circuit as shown below.

3. Plug the power cord or unit to be tested into the test receptacle.

4. Switch the unit being tested to ON or PLAY.

5. Connect external jack/terminal contact VTVM across a 1k resistor in the test circuit. Set the meter to

a high (150V AC) scale to avoid meter damage and then touch the points with the test probe.

If the meter reading indicates less than 3 volts on all test points, set the meter to a low (3V AC) scale

and repeat the test.

6. Any reading greater than 0.2 volt indicates a potential shock hazard. If this occurs, determine the
cause of the leakage, correct the problem, and repeat the safety test.

CD PLAYER CHECKING PROCEDURES

A. WAVE E/F BALANCE ADJUSTMENT

1) Test Point : VC, TS10.

2) Test Disc : Sony Test CD Type 3.

3) Test Equipment :
Scope : DC 0.2 V 0.5 ms.

4) Test Mode : Play Sony CD, Type 3, Track 1, Press FF.
(Fast Forward), Adjust VR401 Until A=B (as Figure Bellow).

SCOPE : DC POSITION

A
B

Figure A

B. FOCUS-BIAS ADJUSTMENT

1) Test Point : VC RFO.

2) Test Disc : Sony Test CD, Type 3.

3) Test Equipment :
Scope : DC 0.5 V 0.5 μs.

SCOPE : AC POSITION

TROUBLESHOOTING

Circuit Symptom Cause and Remedy

General No sound

• Speakers are not connected:
Check the speaker connection.

• Wrong function is selected:
Set switch to the proper position.

• Defective volume control:
Set the volume control to a proper sound level.

• Defective earphone jack:
Replace the earphone jack.

• Mute function is active:

Release it by remote control.

AM No sound, weak sound

(Low sensitivity)

• Improper location of unit:
Rotate or reposition the unit.

• Defect AM antenna coil or oscilloscope coil:
Replace if necessary.

• Intermediate Frequency tuning faulty:
Readjust (see “Alignment and Adjustment”).

• RF tracking faulty:
Readjust (see “Alignment and Adjustment”).

• Defective TA2111
Check voltages. Replace if necessary.

• Poor contact in antenna circuit:

Check resistance and resolder.

FM No sound, weak sound

(Low sensitivity)

• FM antenna not connected:

Connect the built-in or external antenna.

• Defective band selector switch:

Replace or repair the switch.

• Defective TA2111:

Check voltages. Replace if necessary.

• Intermediate Frequency tuning faulty:

Readjust (see “Alignment and Adjustment”).

• Poor contact in FM antenna circuit:

Resoled or repair as required.

CD Cannot read the table of

contents,
no display,
no sound.

• Disc is inserted upside down:

Insert disc correctly.

• Disc is dirty:

Wipe clean with a soft cloth.

• Disc is scratched:

Use a new disc.

• Disc is seriously warped:

Use a new disc.

• A non-standard disc has been inserted:

Use only a brand name disc.

• Moisture has formed inside the CD Pick-up Head:

Wait about 20 to 30 minutes.

• Defect in the servo control board:

Replace or repair as required.

• Defect in the pickup mechanism:

Replace as required.