Sharp XL-DK257N Schematic

XL-DK257N

SERVICE MANUAL

No. S2807XLDK257N

MICRO COMPONENT SYSTEM

O I

D U A IN

MODEL

XL-DK257N Micro Component System consisting of XL-DK257N (main unit) and CP-DK257N (speaker system).

• In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its original condition and only parts identical to those specified be used.

XL-DK257N

iPod is a registered trademark of Apple Inc.

CONTENTS

PRECAUTIONS FOR USING LEAD-FREE SOLDER

CHAPTER 1. GENERAL DESCRIPTION

[1] Important Service Safety Precaution ................ 1-1

[2] Important Service Notes (for U.S.A only).......... 1-1

[3] Specifications..................................................... 1-2

[4] Name Of Parts ................................................... 1-3

CHAPTER 2. ADJUSTMENTS

[1] CD Section .................................................. 2-1

[2] Test Mode .................................................... 2-2

[3] Standard Specification Of Stereo System

Error Message Display Contents ................. 2-4

CHAPTER 3. MECHANICAL DESCRIPTION

[1] Disassembly ................................................ 3-1

CHAPTER 4. BLOCK DIAGRAM

[1] Block Diagram ............................................. 4-1

CHAPTER 5. CIRCUIT DESCRIPTION

[1] Waveforms Of Servo Circuit ........................ 5-1

[2] IC Voltage .................................................... 5-3

CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS LAYOUT

[1] Notes On Schematic Diagram ..................... 6-1

[2] Types Of Transistor And LED ...................... 6-1

[3] Schematic Diagram ..................................... 6-2

[4] Charts Of Connecting Wires ...................... 6-10

[5] Wiring Side of PWB ................................... 6-12

CHAPTER 7. FLOWCHART

[1] Troubleshooting ........................................... 7-1

CHAPTER 8. OTHER

[1] Function Table Of IC .................................... 8-1

[2] FL Display.................................................... 8-9

PARTS GUIDE

Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.

SHARP CORPORATION

– 1

This document has been published to be used for after sales service only. The contents are subject to change without notice.

XL-DK257N

PRECAUTIONS FOR USING LEAD-FREE SOLDER

1. Employing lead-free solder

"MAIN, POWER, AMPLIFIER, HEADPHONE, MICOM REFLASH, DISPLAY, SPEAKER, VOLUME LED LIGHT UP, iPOD, CD PWB" of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWB and service manuals. The alphabetical character following LF shows the type of lead-free solder.

Example:

Indicates lead-free solder of tin, silver and copper.

2. Using lead-free wire solder

When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional lead wire solder may cause damage or accident due to cracks. As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40 C, were commend you to use a dedicated soldring bit, if you are not familiar with how to obtain lead-free wire solder or soldering bit, contact our service station or service branch in your area.

3. Soldering

As the melting point of lead-free solder (Sn-Ag-Cu) is about 220 C which is higher than the conventional lead solder by 40 C, and as it has poor solder wet ability, you may be apt to keep the soldering bit in contact with the PWB for extended period of time. However, since the land may be peeled off or the maximum heat-resistance temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady soldering condition. Lead-free solder contains more tin, and the end of the soldering bit may be easily corrected. Make sure to turn on and off the power of the bit as required. If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit after every use of it.

When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper. Be careful when replacing parts with polarity indication on the PWB silk.

Lead-free wire solder for servicing

Ref No.

PWB-A

PWB-B

PWB-C

PWB-D 92LPWB7119CDUS

Parts No.

92LPWB7119MANS

92LPWB7119DPLS

92LPWB7119PODS

MAIN (A1), POWER (A2), AMPLIFIER (A3) , HEADPHONE (A4), MICOM REFLASH (A5)

DISPLAY (B1), SPEAKER (B2), VOLUME LED LIGHT UP (B3)

iPOD

Description

– 2

XL-DK257N

CHAPTER 1.

GENERAL DESCRIPTION

[1] Important Service Safety Precaution

CAUTION : “These servicing instructions are for use by qualified service personnel only. To reduce the risk of electric shock do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so”.

WARNING

1. For continued safety, no modification of any circuit should be attempted.

2. Disconnect AC power before servicing.

CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH SAME TYPE F801, F802, 6A, 125V/ F803, F804 2A, 125V/ F805 1.6A, 125V/ F806 5A, 125V FUSES.

ATTENTION: POUR ASSURER UNE LONGUE PROTECTION CONTRE UN INCENDIE, REMPLACER SEULEMENT PAR UN FUSIBLE DE TYPE F801, F802, 6A, 125V/ F803, F804 2A, 125V/ F805 1.6A, 125V/ F806 5A, 125V FUSES.

[2] Important Service Notes (for U.S.A only)

BEFORE RETURNING THE AUDIO PRODUCT

(Fire & Shock Hazard)

Before returning the audio product to the user, perform the following safety checks.

1. Inspect all lead dress to make certain that leads are not pinched or that hardware is not lodged between the chassis and other metal parts in the audio product.

2. Inspect all protective devices such as insulating materials, cabinet, terminal board, adjustment and compartment covers or shields, mechanical insulators etc.

3. To be sure that no shock hazard exists, check for leakage current in the following manner.

Plug the AC line cord directly into a 120 volt AC outlet.

* * Using two clip leads, connect a 1.5k ohm, 10 watt

resistor paralleled by a 0.15µF capacitor in series with all exposed metal cabinet parts and a known earth ground, such as conduit or electrical ground connected to earth ground.

Use a VTVM or VOM with 1000 ohm per volt, or

higher, sensitivity to measure the AC voltage drop across the resistor (See diagram).

* Connect the resistor connection to all exposed metal

parts having a return path to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor.

VTVM

AC SCALE

1.5k ohms 10W

0.15µF

TEST PROBE TO EXPOSED METAL PARTS

CONNECT TO KNOWN EARTH GROUND

All check must be repeated with the AC line cord plug connection reversed.

Any reading of 0.3 volt RMS (this corresponds to 0.2 milliamp. AC.) Or more is excessive and indicates a potential shock hazard which must be corrected before returning the audio product to the owner.

1 – 1

1 – 3

XL-DK257N

[3] Specifications

General

Power source AC 120 V ~ 60 Hz

Power consumption 56 W

Dimensions Width: 7-1/16" (180 mm)

Weight 9.5 lbs (4.3 kg)

Height: 10-2/8" (260 mm) Depth: 10-6/8" (273 mm)

Amplifier

Output power

Output terminals Speakers: 4 ohms

Input terminals Audio In (Audio signal):

RMS : Total 160 Watts (80 Watts per

channel into 4 ohms at 1 kHz, 10% total harmonic distortion.)

FTC : 60 Watts minimum RMS per

channel into 4 ohms from 100 Hz to 20 kHz, 10% total harmonic distortion.

Headphones: 16 - 50 ohms (recommended: 32 ohms) Subwoofer pre-out (audio signal): 150 mV/10 k ohms at 70 Hz

250 mV/47 k ohms

CD player

Type Single disc multi-play compact disc player

Signal readout Non-contact, 3-beam semiconductor laser

D/A converter Multi bit D/A converter

Frequency response 20 - 20,000 Hz

Dynamic range 90 dB (1 kHz)

pickup

Tuner

Frequency range

FM: 87.5 - 108 MHz AM: 530 - 1,720 kHz

Speaker

Type

Maximum input power

Rated input power 80 W

Impedance 4 ohms

Dimensions Width: 5-13/16" (148 mm)

Weight 5.40 lbs (2.45 kg)/each

2-way type speaker system 2" (5 cm) tweeter 4-3/4" (12 cm) woofer

160 W

Height: 10-1/4" (260 mm) Depth: 7-13/16" (198.5 mm)

1 – 4

1 – 2

[4] Names Of Parts

Docking Station

MICRO COMPONENT SYSTEM

10 11 12

13 14

XL-DK257N

Front panel

1. Disc Tray

2. Power On/Stand-by Button

3. Disc Tray Open/Close Button

4. Timer Indicator

5. Disc or iPod Play or Pause button

6. Disc Stop Button

7. Volume Control

8. Audio In Jack

9. Phones Jack

10. CD Button

11. Tuner (Band) Button

12. Remote sensor

13. Audio In Button

14. iPod Button

15. iPod Docking Station

1234 56

12 13

8910

Display

1. MP3/WMA Folder Indicator

2. MP3/WMA Title Indicators

3. MP3 Indicator

4. WMA Indicator

5. Sleep Indicator

6. Timer Play Indicator

7. MP3/WMA Total Indicator

8. Daily Timer Indicator

9. FM Stereo Mode Indicator

10. FM Stereo Receiving Indicator

11. Memory Indicator

12. Extra Bass Indicator

13. Disc Repeat Play Indicator

14. Disc Pause Indicator

15. Disc Play Indicator

Rear panel

1. Speaker Terminals

2. AC Power Cord

3. FM 75 Ohms Antenna Jack

4. AM Antenna Ground Terminal

5. AM Loop Antenna Terminal

6. Video Out Jack

7. Subwoofer Pre-output Jack

Speaker system

1. Tweeter

2. Woofer

3. Bass Reflex Duct

4. Speaker Wire

1 – 5

1 – 3

XL-DK257N

5 6

15 16

1817

20 21

Remote control

1. Remote Control Transmitter

2. Disc Clear/Dimmer, iPod Menu Button

3. Memory, iPod Enter Button

4. Disc Direct Search Buttons

5. Equalizer Mode Select Button

6. Extra Bass/Demo Button

7. Volume Up and Down Buttons

8. Power On/Stand-by Button

9. CD Button

10. Tuner (Band) Button

11. Audio In/iPod Button

12. Disc Stop Button

13. Disc Play or Pause Button

14. iPod Play or Pause Button

15. Tuning Up, Select iPod Menu Items Button

16. CD Track Up or Fast Forward, Tuner Preset Up, Time Up Button

17. CD Track Down or Fast Reverse, Tuner Preset Down, Time Down Button

18. Tuning Down, Select iPod Menu Items Button

19. Play Mode Button

20. Display Button

21. Folder Button

22. Clock/Timer Button

1 – 6

1 – 4

CHAPTER 2. ADJUSTMENTS

[1] CD Section

1. CD SECTION

• Adjustment

Since this CD system incorporates the following automatic adjustment functions, readjustment is not needed when replacing the pickup. Therefore, different PWBs and pickups can be combined freely.

Each time a disc is changed, these adjustments are performed automatically. Therefore, playback of each disc can be performed under optimum conditions.

Items adjusted automatically

1) Offset adjustment (The offset voltage between the head amplifier output and the VREF reference voltage is compensated inside the IC.)

* Focus offset adjustment

* Tracking offset adjustment

2) Tracking balance adjustment

3) Gain adjustment (The gain is compensated inside the IC so that the loop gain at the gain crossover frequency will be 0 dB.)

XL-DK257N

* Focus gain adjustment

* Tracking gain adjustment

2 – 1

XL-DK257N

[2] Test Mode

• Setting the test mode

During AC unplug, plug-in AC while pressing down the POWER button and CD button. Then, press the CD button to enter the test mode.

Step

C DTEST

OPEN/CLOSE operation is using manual. IL isn’t done

<< >> key input.

Laser ON.

<< >> key input.

Focus ON

<< >> key input.

CLV Servo ON

<< >> key input.

IL isn’t done

Step

Tracking Servo ON

Hold down << CD >> key for more than 2 sec.

Start Auto Adjustment at current pick-up location.

<< >> key input.

Reading Sub-code and Display

<<STOP>> key input.

STOP and return to Step

<<STOP>> key input.

2 – 2

XL-DK257N

STOP and return to Step

Everytime << DISPLAY >> key input

a) Focus Balance = FB : XX b) Focus Gain = FG : XX c) Tracking Balance = TB : XX d) Tracking Gain = TG : XX e) Focus Offset = FOFF : XX f) Tracking Offset = TOFF : XX g) RFRP = RFRP : XX h) Focus Error (RW Judgement) = RW : XX - XXXX i) Focus Error (Other than RW Judgement) = DA : XX - XXXX

<<STOP>> key input.

STOP and return to Step

Note

Sliding the PICKUP with << >>, << >> button can be set

in STOP mode or play mode. During at Step , if press << >> for more than 1 sec, it directly goes to step .

To cancel: Power OFF

2 – 3

XL-DK257N

[3] Standard Specification Of Stereo System Error Message Display Contents

Error Contents DISPLAY Notes

CD Focus Not Match/IL Time Over. ‘NO DISC’

TUNER PLL Unlock.

87.50

FM MHz

AMP abnormal detection and +B PROTECTION display

In case AMP abnormal detection or +B PROTECTION had occurred, the unit will automatically enter to stand-by mode and Timer indicator will flashing as below.

Example: In case of speaker abnormal

PLL Unlock.

ON TIMER LED OFF OFF

NO NO. 1.1

NO. 1 : +B PROTECTION NO. 2 : AMP abnormal

FLASHING FLASHING

OFF

NO. 2

FRAME

ON ON ON

OFF OFF OFF OFF

NO. 2

(REPEAT)

BEFORE TRANSPORTING THE UNIT

The following process need to be taken after set tapering/parts replacement.

1. Press the POWER ON/STAND-BY button to enter stand-by mode.

2. While pressing down the POWER button and the CD button, plug-in AC. The Micro Computer version number will be displayed as "X7U10**".

3. Press the POWER button until "WAIT"--> "FINISHED" appears.

4. Unplug the AC cord and the unit is ready for transporting.

2 – 4

XL-DK257N

CHAPTER 3.

MECHANICAL DESCRIPTION

[1] Disassembly

Caution on disassembly

Follow the below-mentioned notes when disassembling the unit and reassembling it, to keep it safe and ensure excellent performance:

1) Take cassette tape and compact disc out of the unit.

2) Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit.

3) Take off nylon bands or wire holders where they need to be removed when disassembling the unit. After servicing the unit, be sure to rearrange the leads where they were before disassembling.

4) Take sufficient care on static electricity of integrated circuits and other circuits when servicing.

STEP REMOVAL PROCEDURE FIGURE

1 Top Cabinet 1

2 Side Panel

(Left/Right)

3 CD Changer unit 2

4 Rear Panel with 2

Speaker PWB

5 Front Panel 3

6 Main PWB 3

7 Power PWB 3

8 Speaker PWB 4

9 Display PWB 5

10 USB PWB / SUB PWB 5

11 Jack PWB 5

12 Re-Flash PWB 6

13 CD MP3 PWB 7

14 CD Mechanism 7

1. Screw ............................(A1) X 6

1. Screw ............................(B1) X 8

1. Screw ............................(C1) X 2

2. Hook .............................. (C2) X 2

3. Socket ...........................(C3) X 3

4. Flat Cable ...................... (C4) X 2

1. Screw ............................(D1) X 4

2. Socket ...........................(D2) X 1

3. Flat Cable ...................... (D3) X 1

1. Screw ............................(E1) X 3

2. Flat Cable ...................... (E2) X 2

3. Socket ...........................(E3) X 1

4. Hook .............................. (E4) X 2

1. Screw ............................(F1) X 3

2. Socket ........................... (F2) X 2

1. Screw ............................(G1) X 4

1. Screw ............................(H1) X 2

1. Knob ...............................(J1) X 1

2. Nut..................................(J2) X 1

3. Washer...........................(J3) X 1

4. Screw .............................(J4) X 6

1. Screw ............................(K1) X 2

1. Screw ............................ (L1) X 1

1. Screw ........................... (M1) X 1

1. Screw ............................(N1) X 3

2. Flat Cable ...................... (N2) X 2

3. Socket ...........................(N3) X 1

1. Screw ............................(P1) X 4

2. Screw ............................(P2) X 4

(A1)x2 3x12mm

(B1)x2 3x10mm

Side Panel (Right)

(A1)x2 3x12mm

(B1)x2 3x10mm

(C4)x2

(C3)x1

Rear Panel

Speaker PWB

Power PWB

Rear Panel

(C3)x2

(G1)x4

4x6mm

(B1)x2 3x10mm

(D1)x4 3x10mm

(E4)x1

PULL

(F2)x1

Top Cabinet

Figure 1

CD MP3 PWB

Figure 2

(E1)x1

3x6mm

(F1)x1

3x6mm

CD Changer Unit

(C1)x1 3x10mm

(E3)x1

(B1)x2 3x10mm

PULL

Hook

(C2)x1

Front Panel

(D2)x1

Front panel

Side Panel

(Left)

Front Panel

(D3)x1

PULL

(A1)x2 3x12mm

Hook

(C2)x1

PULL

(C1)x1 3x10mm

(E2)x2

Hook (E4)x1

Note:

After removing the connector for the optical pickup from the connector, wrap the conductive aluminium foil around the front end of the connector so as to protect the optical pickup from electrostatic damage.

3 – 1

Main PWB

Figure 3

(F1)x2 3x10mm

(F2)x1

(E1)x2

3x10mm

XL-DK257N

Speaker PWB

Display PWB

(J4)x6

Ø2.6x10mm

SUB PWB

USB PWB

Rear Panel

Figure 4

Front Panel

(J2)x1

(J3)x1

(H1)x2 Ø3x10mm

(J1)x1

CD Mechanism

CD Changer Unit

Figure 8

(P2)x4 Special

Ø2.6x10mm

Re-Flash PWB

(M1)x1

Ø3x10mm

CD Changer Unit

(K1)x2

Jack PWB

(L1)x1 Special

Figure 5

Main Chassis

Figure 6

(P1)x2

Ø3x10mm

(N1)x3

Ø3x10mm

Figure 7

(N2)x2

(P1)x2

Ø3x10mm

(N3)x1

3 – 2

XL-DK257N

STEP PROCEDURE FIGURE

1 Woofer 1. Net Frame Ass’y............ (A1) X 1

REMOVAL

9, 10

2. Catching Holder............. (A2) X 4

3. Screw ............................ (A3) X 4

4. Screw ............................ (A4) X 4

2 Tweeter 1. Screw ............................ (B1) X 2

Speaker Box

Net Frame Ass’y (A1) x1

(A3)x4

(A2)x4

Ø4x20mm

Figure 9

Tweeter Ring

Woofer

Woofer Ring

LOCKING

TA B

Tweeter

Front Board

Figure 10

SPEAKER

WIRE

(B1)x2 Ø3x14mm

(A4)x4 Ø3.5x14mm

SPEAKER UNIT

LOCKING TAB

CAUTION TO REMOVE SPEAKER UNIT : PRESS THESE LOCKING TABS TO RELEASE SPEAKER WIRE

3 – 3

XL-DK257N

CHAPTER 4. DIAGRAMS

[1] Block Diagram

Figure 1: BLOCK DIAGRAM (1/2)

4 – 1

XL-DK257N

120V/60Hz

Figure 2: BLOCK DIAGRAM (2/2)

4 – 2

XL-DK257N

[2] CD Block Diagrams

Figure 4-3: CD BLOCK DIAGRAM (1/2)

4 – 3

XL-DK257N

PA016AW

Figure 4-4: CD BLOCK DIAGRAM (2/2)

4 – 4

XL-DK257N

FOO

TRO

DMO

FOO

DMO

TEI

RFO

FOO

TEI

FOO

DMO

LPFO

TMAX

BCKI

AIN

LRCKI

RFO

614

619

10115

CHAPTER 5.

CIRCUIT DESCRIPTION

[1] Waveforms Of Servo Circuit

IC1 IC1

IC1

IC1 IC1

IC1

IC1 IC1

IC1

5 – 1

[2] Voltage

IC1

VOLTAGE

1 0.02 26 0.01 51 1.53 76 3.26 2 1.63 27 1.52 52 0.03 77 1.63 3 0.76 28 3.03 53 3.27 78 0.98 4 0.70 5 0.59 30 1.52 55 0.03 80 1.74 6 0.70 7 1.63 32 3.27 57 1.53 82 1.63 8 3.27 33 0.03 58 3.27 83 1.68

9 1.63 34 4.53 59 0.04 84 1.63 10 1.63 35 1.53 60 3.27 85 1.62 11 1.63 36 0.01 61 0.03 86 1.64 12 1.63 37 3.25 62 0.03 87 1.66 13 1.63 38 2.41 63 0.03 88 1.62 14 0.01 39 2.14 64 0.03 89 15 0.52 40 2.59 65 1.62 90 3.27 16 0.55 41 2.25 66 1.65 91 3.25 17 0.01 42 0.61 67 3.24 92 0.01 18 0.01 43 3.25 68 1.49 93 0.02 19 1.11 44 0.04 69 0.02 94 1.63 20 0.36 45 0.04 70 1.63 95 1.63 21 0.26 46 0.04 71 3.26 96 1.63 22 0.01 47 0.04 72 1.61 97 1.63 23 0.26 73 1.31 98 1.63 24 0.34 49 1.64 74 0.02 99 1.64 25 0.54 50 1.65 75 1.38 100 1.63

VOLTAGE

29 1.52 54 0.03 79 0.02

31 0.01 56 3.27 81 1.63

48 0.10

VOLTAGE

XL-DK257N

0.50

IC2

VOLTAGE

1 3.18 10 3.27 19 3.20 28 7.09 2 3.17 11 1.63 20 3.20 29 0.01 3 3.19 12 1.63 21 0.01 30 1.63 4 3.20 13 1.63 22 0.01 31 2.24 5 3.19 14 1.63 23 0.01 32 3.15 6 3.18 15 1.63 24 0.01 33 3.16 7 0.00 16 1.63 25 0.00 34 2.69 8 4.39 17 1.62 26 7.03 35 3.16 9 7.08 18 1.62 27 7.08 36 3.16

Q1 Q2 Q3 Q4

VOLTAGE

E 3.26 E 5.05 E 1.48 E 0.01

C 0.89 C 3.26 C 3.26 C 0.02

B 4.37 B 4.37 B 2.17 B 3.11

VOLTAGE

E 5.08

C 5.05

4.37

VOLTAGE

E 0.00 C 0.04 B

2.98

VOLTAGE

5 – 2

XL-DK257N

IC701 IC601 IC705

VOLTAGE

1 2.60m 51 3.50m 1 4.10 1 8.43 2 2.60m 52 -0.20m 2 4.10 2 8.49 3 3.13 53 1.88 3 4.10 3 3.77 4 3.13 54 3.28 4 0.40m 4 2.39 5 2.00m 55 3.04 5 4.10 5 0.49 6 3.12 56 2.80m 6 4.12 6 0.49 7 3.13 57 2.30m 7 4.10 7 0.49 8 1.30m 58 2.00m 8 4.12 8 0.49

9 0.50m 59 2.80m 9 4.12 10 0.37 60 2.80m 10 4.11 11 0.65 61 2.80m 11 4.12 12 3.21 62 3.13 12 0.40m 13 1.46 63 1.80m 13 0.40m 14 0.20m 64 0.70m 14 0.40m 1 5.01 15 1.35 65 2.00m 15 3.13 2 5.00 16 3.15 66 2.40m 16 3.13 3 4.88 17 3.15 67 3.04 17 3.13 4 0.70m 18 1.15 68 0.60m 18 9.28 5 4.90 19 1.40m 69 1.10m 19 9.28 6 5.00 20 3.11 70 3.28 20 4.10 7 5.02 21 3.28 71 33.80m 21 4.12 8 10.00 22 1.30m 72 3.13 22 4.12 23 2.30m 73 3.13 23 4.11 24 2.60m 74 2.90m 24 4.12 25 0.90m 75 2.80m 25 4.12 26 1.40m 76 2.10m 26 4.10 27 3.21 77 1.10m 27 4.12 1 2.02 28 3.13 78 3.13 28 4.11 2 216.70m 29 3.21 79 1.50m 29 0.50m 3 2.02 30 3.21 80 3.11 30 4.11 4 -1.80m 31 1.48 81 2.70m 31 4.11 5 2.03 32 4.80m 82 3.11 32 4.11 6 2.04 33 2.13 83 4.90m 7 2.02 34 0.86 84 48.00m 8 5.07 35 4.40m 85 3.28 36 4.50m 86 3.13 37 4.10m 87 2.70m 38 24.20m 88 2.90m 39 23.70m 89 3.10m 1 2.39 13 -26.81 40 4.30m 90 2.00m 2 -0.94 14 -6.32 41 0.90m 91 3.28 3 -0.94 15 -5.91 42 4.30m 92 3.18 4 -0.90 16 -0.81 43 3.80m 93 3.18 5 0.40m 17 -26.60 44 4.20m 94 3.18 6 -26.65 18 -26.60 45 4.20m 95 3.18 7 260.90m 19 0.00 46 3.12 96 1.30m 8 -0.80 20 -0.90 47 3.30m 97 3.18 9 -6.02 21 -0.30m 48 3.70m 98 53.50m 10 -6.53 22 -0.30m 49 3.90m 99 3.13 11 -26.71 23 -0.93 50 3.20m 100 2.90m 12 -14.31

(V)

VOLTAGE

(V)

VOLTAGE

PINNOVOLTAGE

(V)

PINNOVOLTAGE

IC901

PINNOVOLTAGE

VOLTAGE

IC604

IC603

(V)

5 – 3

XL-DK257N

IC702

VOLTAGE

1 -26.44 33 -26.42 2 -26.40 34 -28.77 3 -26.40 35 -26.41 4 -26.40 36 -26.40 5 3.24 37 -26.41 6 3.20 38 -24.06 7 3.27 39 -17.00 8 3.24 40 -26.40

9 0.00 41 -24.07 10 0.00 42 -9.89 11 3.29 43 -26.40 12 1.51 44 -9.98 13 1.51 45 -17.00 14 0.00 46 -12.34 15 -24.10 47 -9.94 16 -28.77 48 -26.40 17 -28.78 49 -26.42 18 -28.77 50 -24.06 19 -28.77 51 -14.67 20 -28-75 52 -12.36 21 -28.77 53 -28.76 22 -28.77 54 -28.76 23 -21.70 55 -28.76 24 -28.97 56 -28.75 25 -26.40 57 -26.45 26 -28.77 58 -26.41 27 -28.76 59 -26.41 28 -28.76 60 -26.40 29 21.71 61 -26.40 30 -24.06 62 -26.40 31 -24.07 63 -26.40 32 -24.07 64 -26.40

(V)

VOLTAGE

(V)

IC851 IC852

VOLTAGE

(V)

VOLTAGE

(V)

1 5.10 1 13.24 2 13.00 2 88.4m 3 17.60 3 4.76

m01.01-4

08.615

00.016

64.87

Q905IC853

VOLTAGE

VOLTAGE 1 5.07 D 35.10 2 5.07 S 26.53 3 3.28 G 31.77

39.14 m05.01-5 m04.01-6 m02.01-7

8 -10.20m

Q901

VOLTAGE D 27.82 S 35.68 G 30.91

5 – 4

XL-DK257N

-MEMO-

5 – 5

XL-DK257N

CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS LAYOUT

[1] Notes On Schematic Diagram

•Resistor: To differentiate the units of resistors, such symbol as K and M are used: the symbol K means 1000 ohm and the symbol M means 1000 kohm and the resistor without any symbol is ohm-type resistor. Besides, the one with “Fusible” is a fuse type.

• Capacitor: To indicate the unit of capacitor, a symbol P is used: this symbol P means pico-farad and the unit of the capacitor without such a symbol is microfarad. As to electrolytic capacitor, the expression “capacitance/ withstand voltage” is used. (CH), (TH), (RH), (UJ): Temperature compensation (ML): Mylar type (P.P.): Polypropylene type

REF. NO DESCRIPTION POSITION

SW701 POWER ON/STAND-BY ON—OFF SW702 TRAY OPEN/CLOSE ON—OFF SW703 PLAY/PAUSE ON—OFF SW704 STOP ON—OFF SW705 CD ON—OFF SW706 iPOD ON—OFF SW707 TUNER (BAND) ON—OFF SW708 AUDIO IN ON—OFF VR701 VOLUME MAX—MIN

• Schematic diagram and Wiring Side of P.W.Board for this model are subject to change for improvement without prior notice.

• The indicated voltage in each section is the one measured by Digital Multimeter between such a section and the chassis with no signal given.

1. In the tuner section,

indicates AM indicates FM stereo

2. In the CD section, the CD is stopped.

• Parts marked with “ ” ( ) are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.

[2] Types Of Transistor And LED

FRONT

VIEW

ECB (S)(G)(D) (1)(2)(3)

KTA1271 Y KTA1274 Y

FRONT

VIEW

123

TDA8920

KTC3199 GR KTC3203 Y KTA1266 GR

(3)

VIEW

(1)

KRA102 S KRC107 KRC102 S KRC104 S KTA1504 GR KTC3875 GR KTA1544 T KRA107 S

FRONT

VIEW

AC AC

10XB60F

TOP

(2)

TOP VIEWTOP VIEW

HSS4148

FRONT VIEW

343VC3F 503BC2E30

1N4004S DRL204F MA 111

FRONT

VIEW

123

KIA7805A NTP18N06LG

6 – 1

XL-DK257N

[3] Schematic Diagram

ZJ15B

NTP18N06

GD1A4

22/100 22/100

GD1A4

TO AMPLIFIER SECTION

10K

0.22

ZJ24B

2.2

GD1A4

ZJ27D

ZJ1SB

ZJ5R1B

22K

560

0.22

NTP18N06

47/10

100/16

TO MICOM SECTION

23456

Figure 6-1: MAIN SCHEMATIC DIAGRAM (1/6)

6 – 2

FROM POWER SECTION

XL-DK257N

0.22

LUG2 A980AW

2.7K

C632

4700pF

5.6K

6.8K

2.7K

8 9 10 11 12

Figure 6-2: MAIN SCHEMATIC DIAGRAM (2/6)

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XL-DK257N

6.8K

FROM HEADPHONE PWB-A4

2.7K

C633

4700pF

TO CHASSIS

TO MICOM SECTION

14 15 16 17 18

TO IPOD SECTION

Figure 6-3: MAIN SCHEMATIC DIAGRAM (3/6)

6 – 4

XL-DK257N

TO MICOM SECTION

TO CD MP3

IN4004S IN4004S

CNP301 ZX11AW

23456

Figure 6-4: MAIN SCHEMATIC DIAGRAM (4/6)

6 – 5

XL-DK257N

2.7K

MA111G

GND

8 9 10 11 12

D905

D906

Figure 6-5: MAIN SCHEMATIC DIAGRAM (5/6)

6 – 6

XL-DK257N

2.7K

C633

4700pF

TO MICOM SECTION

TO IPOD SECTION

JP41

100µH

ZD862 ZJ15B

D851 HSS4148

TO MICOM SECTION

+13V

FROM POWER SECTION

FROM CLAMP SECTION

14 15 16 17 18

Figure 6-6: MAIN SCHEMATIC DIAGRAM (6/6)

6 – 7

XL-DK257N

AMPLIFIER SECTION

Z2130SCT5T

23456

Figure 6-7: AMPLIFIER & SPEAKER SCHEMATIC DIAGRAM (1/2)

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