Daewoo NC-8913, NC-8911, NC-8915DE, NC-8915DU Service Manual

Service Manual

MiniComponentSoundSystem

9CD8308100

July. 2009

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SAFETY PRECAUTIONS

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TROUBLE SHOOTING GUIDE

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EXPLODED VIEW AND MECHANICAL PARTS LIST

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WIRING DIAGRAM

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BLOCK DIAGRAM

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SCHEMATIC DIAGRAM

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FRONT Section
MP3/CD Section
MAIN Section
POWER Section

P.C.B PATTERN LAYOUT

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FRONT Section
MP3/CD Section
MAIN Section
POWER Section

APPENDIX-ELECTRICAL PART LIST

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TableofContents

Mini component sound system

NC-8911/NC-8913/NC-8915DU
NC-8911/NC-8913/NC-8915DE

ADJUSTMENTS

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Safety Precautions

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Safety Precautions

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Adjustments

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●TUNER Section

FM TEST EQUIPMENT

1.Adjust L003 to obtain 87MHz±0.5

2.Adjust PVC1(FM OSC)to obtain 108.5MHz±0.5

3.Adjust L002 to obtain maximal waveform for 90MHz

4.Adjust PVC2(FM ANT)to obtain maximal waveform for 106MHz

Item Input Circuit Setup Output Circuit Setup S.S.G setting Adjust point Adjustment

FM Frequency Connect output signal Connect V-Input signal 87MHz L003 Adjust for

Range Adjustment generator to FM ANT generator to CE002(-)/ Dev.26dB 87MHz±0.5

terminal of D001(-) CE003(-) pin 108.5MHz PVC1(FM OSC) Adjust for

5.0±zHM5.801Bd62.veDnip

FM RF Connect output signal Connect V-Input signal 90MHz L002 Adjust maximal

generator to FM ANT generator to CE002(-)/ Dev.26dB waveform for 90MHz

terminal of D001(-) CE003(-) pin 106MHz PVC2(FM ANT) Adjust maximal

zHM601 rof mrofevawBd62.veDnip

Adjustments

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●TUNER Section

AM TEST EQUIPMENT

1.Adjust L009 to obtain 510KHz±10(America)/513KHz±9(Europe)

2.Adjust PVC3(AM OSC)to obtain 1730KHz±20(America)/1638KHz±18(Europe).

3.Adjust L011 to obtain maximal waveform for 600KHz

4.Adjust PVC4(AM ANT)to obtain maximal waveform for 1400KHz

Item Input Circuit Setup Output Circuit Setup S.S.G setting Adjust point Adjustment

AM Frequency Connect output signal Connect V-Input signal 510KHz(America) L009 Adjust for

Range Adjustment generator to test loop generator to CE002(-)/ 513KHz(Europe) 510KHz±10(America)

)eporuE(9±zHK315Bd06.veDnip )-(300EC

1730KHz(America) PVC3(AM OSC) Adjust for

1638KHz(Europe) 1730KHz±20(America)

)eporuE(81±zHK8361Bd06.veD

AM RF Connect output signal Connect V-Input signal 600KHz L011 Adjust maximal

zHK006 rof mrofevawBd06.veD/)-(200EC ot rotarenegpool tset ot rotareneg

CE003(-) pin 1400KHz PVC4(AM ANT) Adjust maximal

zHK0041 rof mrofevawBd06.veD

AM Antenna

AM
Antenna
Terminal

SET

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TroubleShootingGuide

MP3/CD Section

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CD open and disc insert

Refer to 2

Spindle motor rotation

Pick-up unit return(outside >>

inside)

Laser diode on

Focusing operation

Read in CD/MP3 disc operation

Reading and auto play

CD play on

Refer to 3

Refer to 4

Refer to 5

Refer to 6

Auto to play

CD close and CD on

Refer to 1

AC cord in

Power ON/OFF ON

Reading in USB file and USB

Encoding operation

Refer to 7

TroubleShootingGuide

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MP3/CD Section

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1. Pick-up unit return

2. CD o

p

en and disc insert

3. Laser diode on

STOP PLAY

C 0V 1.8V
B 3.3V 2.1V

(HQ500)

E 3.3V 2.8V

CD open and disc

insert

AC cord in

Function to CD

and Initializing

no

1. Check CN704

2. Check IC701 of 38pin and 39pin and 40pin
41pin and 44pin.

3. Check CN502,CW504.CN505

4. Check IC504 of 3pin:5.0V

5. Check Q501 collector:+3.3V

6. Check +3.3V (IC500 pin8/18/23/25/38/57/85/113/116/122)

7. Check (IC502 SA5888 of 17pin and 18pin)SP+ 4.41V ,
SP- 3.41V

8. Check SPDO +1.90V (IC500 M5673 or M5675 pin123)

9. Check (IC502 SA5888 of 12pin and 11pin) SL- 3.81V,
SL+ 3.91V

10. Check CD Board(Around IC solder short,cold soldering )

CD open and disc insert

Yes

Yes

CD close and cd on

Laser diode on

Yes

Focusing operation

no

1. Check +1.8V LD on(HQ500 collector)

2. Check +2.1V (HQ500 base pin) >>>in case of play

B

E

C

no

Yes

Yes

Power ON/OFF ON

no

1.Check F980，F981

2.Check PT903

3.Check RF982，RF983

4.Check CN902,CN701

5.Check IC900 of 3pin:9V ,
IC704 of 2pin:3.3V

6.IC701 of 22pin:3.3V

1. Check CN505 of 5pin.

2. Check IC502 SA5888 of 10pin

no

1. Check CN505 of 3pin.

2. Check IC502 SA5888 of 9pin

TroubleShootingGuide

MP3/CD Section

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4. Focusing operation

5. Spindle motor rotation

6. Read in CD/MP3 disc operation

7. Read in USB file and USB Encoding operation

Focusing

operation

Yes

no

1. Check (IC502 SA5888 of 13pin and 14pin)
13pin 3.95V >>3.99V, pin18 3.72V >> 3.75V >>>
in case of play.

2. Check +1.58V(IC500 M5673 or M5675 of 126pin).

Spindle motor

rotation

Yes

no

1. Check SPDO +1.90V(IC500 M5673 or M5675 of 123Pin)
in case of play。

2. Check (IC502 SA5888 of 12pin and 11pin) SL- 3.81V,
SL+ 3.91V.

3. Check (IC502 SA5888 of 17pin and 18pin)SP+ 4.41V ,
SP- 3.41V

Read in CD/MP3

disc

Yes

no

Yes

1. Check CN704

2. Check IC701 of 38pin and 39pin and 40pin
41pin and 44pin.

3. Check CN502,CW504.CN505

4. Check IC504 of 3pin:5.0V

5. Check Q501 collector:+3.3V

6. Check +3.3V (IC500 pin8/18/23/25/38/57/85/113/116/122)

7. Check (IC502 SA5888 of 17pin and 18pin)SP+ 4.41V ,
SP- 3.41V

8. Check SPDO +1.90V (IC500 M5673 or M5675 pin123)

9. Check (IC502 SA5888 of 12pin and 11pin) SL- 3.81V,
SL+ 3.91V

10. Check CD Board(Around IC solder short,cold soldering )

Yes

Read in USB file

operation

1. Check IC500(M5673 or M5675) of 52pin and 53pin.

2. Check CW507,CN707.

3. Check J702.

no

USB Encoding

no

1. Check IC500 (M5675) of 52pin and 53pin.

2. Check CN502 7pin 8pin and 9pin.

3. Check IC500(M5675) 40pin,43pin input signal.

4. Check IC500(M5675) 33pin,36pin output signal.