Sharp XL-DK257N Schematic

XL-DK257N

SERVICE MANUAL

No. S2807XLDK257N

MICRO COMPONENT SYSTEM

MODEL XL-DK257N

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.

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	This document has been published to be used for
	after sales service only.
– 1	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.	Parts No.	Description
PWB-A	92LPWB7119MANS	MAIN (A1), POWER (A2), AMPLIFIER (A3) , HEADPHONE (A4), MICOM REFLASH (A5)
PWB-B	92LPWB7119DPLS	DISPLAY (B1), SPEAKER (B2), VOLUME LED LIGHT UP (B3)
PWB-C	92LPWB7119PODS	iPOD
PWB-D	92LPWB7119CDUS	CD

– 2i

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

0.15 µ F

TEST PROBE

TO EXPOSED

CONNECT TO

METAL PARTS

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 – 13

XL-DK257N

[3] Specifications

General

Power source	AC 120 V ~ 60 Hz
Power consumption	56 W
Dimensions	Width: 7-1/16" (180 mm)
	Height: 10-2/8" (260 mm)
	Depth: 10-6/8" (273 mm)
Weight	9.5 lbs (4.3 kg)

CD player

Type	Single disc multi-play compact disc player
Signal readout	Non-contact, 3-beam semiconductor laser
	pickup
D/A converter	Multi bit D/A converter
Frequency response	20 - 20,000 Hz
Dynamic range	90 dB (1 kHz)

Amplifier

Output power	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.
Output terminals	Speakers: 4 ohms
	Headphones: 16 - 50 ohms
	(recommended: 32 ohms)
	Subwoofer pre-out (audio signal):
	150 mV/10 k ohms at 70 Hz
Input terminals	Audio In (Audio signal):
	250 mV/47 k ohms

Tuner

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

Speaker

Type	2-way type speaker system
	2" (5 cm) tweeter
	4-3/4" (12 cm) woofer
Maximum input	160 W
power
Rated input power	80 W
Impedance	4 ohms
Dimensions	Width: 5-13/16" (148 mm)
	Height: 10-1/4" (260 mm)
	Depth: 7-13/16" (198.5 mm)
Weight	5.40 lbs (2.45 kg)/each

1 – 24

[4] Names Of Parts

10

11

12

13

14

15

Docking Station

MICRO COMPONENT SYSTEM

1	2		3	4	5	6

12

13

8

9 10

7

14 15

11

3

4

5

6

1

7

2

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

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
1.		Tweeter
2.		Woofer	2
3.		Bass Reflex Duct
4.		Speaker Wire

XL-DK257N

3

4

1 – 53

	XL-DK257N
	1
	2	8
		9
	3		13
		12
		10
		11	14
		15	16

17	18
4
5	19	20	21
	22
6
7

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 – 46

XL-DK257N

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.)

*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.

C D

T E S T

OPEN/CLOSE operation is using manual.

1

Step

<<

/

>> key input.

Laser ON.

Step

2

<<

/

>> key input.

Focus ON

Step

3

<<

/

>> key input.

CLV Servo ON

Step

4

<<

/

>> key input.

Tracking Servo ON

Step

5

<<

/

>> key input.

Reading Sub-code and Display

<<STOP>> key input.

STOP and return to Step 1

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

Start Auto Adjustment at current pick-up location.

<<STOP>> key input.

IL isn’t done

IL isn’t done

2 – 2

XL-DK257N

STOP and return to Step 1

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 1

Note Sliding the PICKUP with <<	>>, <<					>> button can be set
in STOP mode or play mode.
During at Step 1 , if press <<	/				>> for more than 1 sec, it directly
goes to step 5 .

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		PLL Unlock.
		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

ON

FLASHING

ON

ON

FLASHING

ON

TIMER

OFF

OFF

OFF

OFF

OFF

NO. 1

NO. 1

LED OFF

OFF

NO. 2

NO.

2

1 FRAME

(REPEAT)

NO. 1 : +B PROTECTION

NO. 2 : AMP abnormal

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							Top Cabinet	Front Panel
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.					(A1)x2
2) Be sure to remove the power supply plug from the
					3x12mm
wall outlet before starting to disassemble the unit.					(B1)x2
3) Take off nylon bands or wire holders where they								(A1)x2
					3x10mm
								3x12mm
need to be removed when disassembling the unit.
After servicing the unit, be sure to rearrange the								Side Panel
								(Left)
leads where they were before disassembling.					Side Panel
					(Right)
4) Take sufficient care on static electricity of integrated					(A1)x2
circuits and other circuits when servicing.
					3x12mm	(B1)x2
						3x10mm Rear Panel
							(B1)x2
STEP	REMOVAL		PROCEDURE	FIGURE			3x10mm
							(B1)x2
1	Top Cabinet	1.	Screw	(A1) X 6	1		3x10mm
							Figure 1
					(C4)x2
2	Side Panel	1.	Screw	(B1) X 8			(C3)x2
					1
	(Left/Right)						CD MP3 PWB
3	CD Changer unit	1.	Screw ............................	(C1) X 2	2		CD Changer Unit
		2.	Hook ..............................	(C2) X 2		(C3)x1
		3.	Socket ...........................	(C3) X 3				Front Panel
		4.	Flat Cable ......................	(C4) X 2			PULL
4	Rear Panel with	1.	Screw ............................	(D1) X 4	2		(C1)x1
	Speaker PWB
		2.	Socket ...........................	(D2) X 1			3x10mm	Hook
		3.	Flat Cable	(D3) X 1			Hook
							(C2)x1	(C2)x1
5	Front Panel	1.	Screw	(E1) X 3	3			PULL
		2.	Flat Cable ......................	(E2) X 2				(C1)x1
		3.	Socket ...........................	(E3) X 1				3x10mm
		4.	Hook ..............................	(E4) X 2		Rear Panel
6	Main PWB	1. Screw ............................		(F1) X 3	3	Speaker PWB		(D3)x1
		2.	Socket	(F2) X 2
7	Power PWB	1. Screw ............................		(G1) X 4	3		(D1)x4	(D2)x1
8	Speaker PWB	1. Screw		(H1) X 2	4
							3x10mm
9	Display PWB	1.	Knob	(J1) X 1	5		Figure 2
							(E1)x1
		2.	Nut	(J2) X 1				Front panel
							3x6mm
		3.	Washer ...........................	(J3) X 1			(F1)x1
		4.	Screw	(J4) X 6			3x6mm
							(E4)x1
10	USB PWB / SUB PWB	1. Screw		(K1) X 2	5
							PULL
11	Jack PWB	1.	Screw	(L1) X 1	5		(E3)x1
12	Re-Flash PWB	1.	Screw ...........................	(M1) X 1	6		(F2)x1
13	CD MP3 PWB				7
		1. Screw ............................		(N1) X 3			(G1)x4
		2.	Flat Cable	(N2) X 2			4x6mm	(E2)x2
						Power PWB
		3.	Socket	(N3) X 1
14	CD Mechanism	1.	Screw	(P1) X 4	7			Hook
								(E4)x1
		2.	Screw ............................	(P2) X 4	8
								PULL
Note:
After removing the connector for the optical pickup from								(E1)x2
the connector, wrap the conductive aluminium foil around								3x10mm
								(F2)x1
the front end of the connector so as to protect the optical							(F1)x2
pickup from electrostatic damage.							Main PWB 3x10mm

Figure 3

3 – 1

XL-DK257N

Rear Panel

(H1)x2

Ø3x10mm

Speaker PWB

Figure 4

Front Panel

Display PWB

(J2)x1

(J4)x6

Ø2.6x10mm

(J1)x1

(J3)x1

SUB PWB

USB PWB

(K1)x2

Ø2.6x10mm

Jack PWB

(L1)x1 Special

Figure 5

Re-Flash PWB

(M1)x1 Ø3x10mm

Main Chassis

Figure 6

CD Changer

Unit

(P1)x2 (N2)x2 Ø3x10mm

(P1)x2

(N3)x1

Ø3x10mm

(N1)x3 Ø3x10mm

Figure 7

(P2)x4 Special

CD Mechanism

CD Changer Unit

Figure 8

3 – 2

XL-DK257N

STEP	REMOVAL		PROCEDURE		FIGURE
1	Woofer	1. Net Frame Ass’y............		(A1) X 1	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	10

Speaker Box

Net Frame Ass’y (A1) x1

(A3)x4

Ø4x20mm

(A2)x4

Figure 9

Front Board

(B1)x2

Tweeter

Ø3x14mm

Tweeter Ring

(A4)x4 Ø3.5x14mm

Woofer

Woofer Ring

Figure 10

	SPEAKER
	UNIT
LOCKING	LOCKING TAB
TAB
	SPEAKER
	WIRE

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

CHAPTER 5. CIRCUIT DESCRIPTION

[1] Waveforms Of Servo Circuit

1

IC1 9

2

IC1 10

1

IC1 9

6

IC1 13

4

IC1 6

1

IC1 9

9

IC1 67

10

IC1 66

11

IC1 65

FOO

TRO

FOO

DMO

TEI

FOO

LRCKI

BCKI

AIN

1

IC1 9

6

IC1 13

1

IC1 9

5

IC1 89

4

IC1 6

7

IC1 74

8

IC1 76

6

IC1 13

1

IC1 9

5

IC1 89

FOO

DMO

FOO

RFO

TEI

TMAX

LPFO

DMO

FOO

RFO

5 – 1

XL-DK257N

[2] Voltage

IC1

	PIN		VOLTAGE		PIN	VOLTAGE			PIN		VOLTAGE			PIN		VOLTAGE
	NO				NO				NO					NO
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			29	1.52		54		0.03			79		0.02
5		0.59			30	1.52		55		0.03			80		1.74
6		0.70			31	0.01		56		3.27			81		1.63
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		0.50
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			48	0.10		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
							IC2
	PIN		VOLTAGE		PIN	VOLTAGE			PIN		VOLTAGE			PIN		VOLTAGE
	NO				NO				NO					NO
	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
	PIN		VOLTAGE		PIN	VOLTAGE			PIN		VOLTAGE			PIN		VOLTAGE
	NO				NO				NO					NO
	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
			Q5			Q8
	PIN		VOLTAGE		PIN	VOLTAGE
	NO				NO
	E		5.08		E	0.00
	C		5.05		C	0.04
	B		4.37		B	2.98

5 – 2

XL-DK257N

IC701

PIN	VOLTAGE		PIN	VOLTAGE
NO	(V)		NO	(V)
1	2.60m		51	3.50m
2	2.60m		52	-0.20m
3	3.13		53	1.88
4	3.13		54	3.28
5	2.00m		55	3.04
6	3.12		56	2.80m
7	3.13		57	2.30m
8	1.30m		58	2.00m
9	0.50m		59	2.80m
10	0.37		60	2.80m
11	0.65		61	2.80m
12	3.21		62	3.13
13	1.46		63	1.80m
14	0.20m		64	0.70m
15	1.35		65	2.00m
16	3.15		66	2.40m
17	3.15		67	3.04
18	1.15		68	0.60m
19	1.40m		69	1.10m
20	3.11		70	3.28
21	3.28		71	33.80m
22	1.30m		72	3.13
23	2.30m		73	3.13
24	2.60m		74	2.90m
25	0.90m		75	2.80m
26	1.40m		76	2.10m
27	3.21		77	1.10m
28	3.13		78	3.13
29	3.21		79	1.50m
30	3.21		80	3.11
31	1.48		81	2.70m
32	4.80m		82	3.11
33	2.13		83	4.90m
34	0.86		84	48.00m
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
40	4.30m		90	2.00m
41	0.90m		91	3.28
42	4.30m		92	3.18
43	3.80m		93	3.18
44	4.20m		94	3.18
45	4.20m		95	3.18
46	3.12		96	1.30m
47	3.30m		97	3.18
48	3.70m		98	53.50m
49	3.90m		99	3.13
50	3.20m		100	2.90m

	IC601
PIN	VOLTAGE
NO	(V)
1	4.10
2	4.10
3	4.10
4	0.40m
5	4.10
6	4.12
7	4.10
8	4.12
9	4.12
10	4.11
11	4.12
12	0.40m
13	0.40m
14	0.40m
15	3.13
16	3.13
17	3.13
18	9.28
19	9.28
20	4.10
21	4.12
22	4.12
23	4.11
24	4.12
25	4.12
26	4.10
27	4.12
28	4.11
29	0.50m
30	4.11
31	4.11
32	4.11

	IC705
PIN	VOLTAGE
NO	(V)

18.43

28.49

33.77

42.39

50.49

60.49

70.49

80.49

	IC604
PIN	VOLTAGE
NO	(V)

15.01

25.00

34.88

40.70m

54.90

65.00

75.02

810.00

	IC603
PIN	VOLTAGE
NO	(V)

12.02

2216.70m

32.02

4-1.80m

52.03

62.04

72.02

85.07

IC901

PIN	VOLTAGE
NO	(V)
1	2.39
2	-0.94
3	-0.94
4	-0.90
5	0.40m
6	-26.65
7	260.90m
8	-0.80
9	-6.02
10	-6.53
11	-26.71
12	-14.31

PIN	VOLTAGE
NO	(V)
13	-26.81
14	-6.32
15	-5.91
16	-0.81
17	-26.60
18	-26.60
19	0.00
20	-0.90
21	-0.30m
22	-0.30m
23	-0.93

5 – 3

XL-DK257N

IC702

PIN	VOLTAGE		PIN	VOLTAGE
NO	(V)		NO	(V)
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

	IC851
PIN	VOLTAGE
NO	(V)
1	5.10
2	13.00
3	17.60
4	-10.10m
5	16.80
6	10.00
7	8.46

	IC852
PIN	VOLTAGE
NO	(V)
1	13.24
2	88.4m
3	4.76

		IC853
PIN
NO		VOLTAGE
1		5.07
2		5.07
3		3.28
4		1.93
5		-10.50m
6		-10.40m
7		-10.20m
8		-10.20m
		Q901
PIN
NO		VOLTAGE
D	27.82
S	35.68
G	30.91

	Q905
PIN
NO	VOLTAGE
D	35.10
S	26.53
G	31.77

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

TOP VIEW

TOP VIEW

VIEW

B

(3)

TOP

C

VIEW

(2)

E

E C B

(1)

(S)(G)(D)

(1)(2)(3)

KRA102 S

HSS4148

1N4004S

KTA1271 Y

KTC3199 GR

KRC107

KTA1274 Y

KTC3203 Y

KRC102 S

DRL204F

KTA1266 GR

KRC104 S

MA111

KTA1504 GR

KTC3875 GR

KTA1544 T

KRA107 S

FRONT

FRONT

FRONT

FRONT

VIEW

VIEW

VIEW

VIEW

1 2 3

1

23

AC AC

10XB60F

343VC3F

KIA7805A

TDA8920

503BC2E30

NTP18N06LG

6 – 1

XL-DK257N

[3] Schematic Diagram

			NTP18N06
A
			ZJ15B	GD1A4
				22/10022/100
			GD1A4	GD1A4
B			1K
	AMPLIFIERSECTION		10K
			2.2	ZJ27D
			0.22
					ZJ5R1B
C	TO
			ZJ24B	ZJ1SB	22K
					560	0.22
D
			NTP18N06
E
F			47/10
				47/10
				100/16
G	TO MICOM SECTION
H
1	2	3	4	5	6

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

6 – 2

XL-DK257N

FROM POWER SECTION

LUG2

A980AW

0.22

2.7K	C632	4700pF		5.6K		5.6K	6.8K
							2.7K
7			8	9	10	11	12

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

6 – 3

XL-DK257N

6.8K
2.7K	C633	4700pF

13

14

FROM HEADPHONE PWB-A4

TO CHASSIS

		TO MICOM
		SECTION
15	TOIPOD SECTION	17	18
	16

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

6 – 4

					XL-DK257N
A	TO MICOM SECTION
B
C	CD MP3
				IN4004S	IN4004S
	TO
D
E
F
G
		CNP301
		ZX11AW
H
1	2	3	4	5	6

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

6 – 5

XL-DK257N

2.7K

GND

MA111G	MA111G
D905	D906

7

8

9

10

11

12

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

6 – 6

XL-DK257N

2.7K

C633

4700pF

JP41

100µH

TO MICOM

SECTION

TO IPOD SECTION

TO MICOM SECTION

2

ZD862

ZJ15B

D851

HSS4148

+13V SECTIONPOWER FROM

FROM CLAMP SECTION

13

14

15

16

17

18

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

6 – 7

XL-DK257N

AMPLIFIER SECTION

A
B
C
D
E
F
			13	Z2130SCT5T	Z2130SCT5T
			12
G
			9
			8
H
1	2	3	4	5	6

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

6 – 8