Pioneer XRA-550-MD Service manual

STEREO CD MD CASSETTE DECK RECEIVER XR-A550MD

MD

3

ASES

EJECT

STEREO CASSETTE DECK

REC/PLAY

FULL LOGIC AUTO REVERSE

MINIDISC

ORDER NO.

RRV2107

COMPACT MINI COMPONENT

XR-A550MD

THIS MANUAL IS APPLICABLE TO THE FOLLOWING MODEL(S) AND TYPE(S).

	Type	Model	Power Requirement	The Voltage can be converted by
		XR-A550MD		the following method.
	KUCXJ		AC120V
	DBDXJ		AC110-127V/220-230V/240V	With the voltage selector

CONTENTS

1. SAFETY INFORMATION ......................................	2	7. GENERAL INFORMATION							................................				92
2. EXPLODED VIEWS AND PARTS LIST ................	3	7.1 PARTS		..........................................................									92
3. SCHEMATIC DIAGRAM .....................................	16	7.1.1 IC	...........................................................										92
4. PCB CONNECTION DIAGRAM ..........................	42	7.1.2 DISPLAY				................................................							94
5. PCB PARTS LIST ...............................................	62	7.2 DIAGNOSIS			..................................................								96
6. ADJUSTMENT ....................................................	70	7.2.1 DISASSEMBLY						.....................................					96
		7.2.2 DETAILS OF ERROR DISPLAY									.........	102
		7.2.3 TROUBLESHOOTING								........................		104
		7.3 BLOCK DIAGRAM					......................................					109

8. PANEL FACILITIES AND SPECIFICATIONS .. 112

PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan PIONEER ELECTRONICS SERVICE, INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A.

PIONEER ELECTRONIC (EUROPE) N.V. Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936 c PIONEER ELECTRONIC CORPORATION 1999

T – IZE MAR. 1999 Printed in Japan

XR-A550MD

1. SAFETY INFORMATION

This service manual is intended for qualified service technicians ; it is not meant for the casual do-it- yourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair complex products such as those covered by this manual.

Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warranty. If you are not qualified to perform the repair of this product properly and safely, you should not risk trying to do so and refer the repair to a qualified service technician.

WARNING

This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of California to cause cancer, birth defects or other reproductive harm.

Health & Safety Code Section 25249.6 – Proposition 65

NOTICE

(FOR CANADIAN MODEL ONLY)

Fuse symbols (fast operating fuse) and/or (slow operating fuse) on PCB indicate that replacement parts must be of identical designation.

REMARQUE

(POUR MODÈLE CANADIEN SEULEMENT)

Les symboles de fusible (fusible de type rapide) et/ou (fusible de type lent) sur CCI indiquent que les pièces de remplacement doivent avoir la même désignation.

(FOR USA MODEL ONLY)

1. SAFETY PRECAUTIONS

The following check should be performed for the continued protection of the customer and service technician.

LEAKAGE CURRENT CHECK

Measure leakage current to a known earth ground (water pipe, conduit, etc.) by connecting a leakage current tester such as Simpson Model 229-2 or equivalent between the earth ground and all exposed metal parts of the appliance (input/output terminals, screwheads, metal overlays, control shaft, etc.). Plug the AC line cord of the appliance directly into a 120V AC 60Hz outlet and turn the AC power switch on. Any current measured must not exceed 0.5mA.

		Reading should
	Leakage	not be above
Device	current	0.5mA
under	tester
test
Test all
exposed metal
surfaces
Also test with
plug reversed		Earth
(Using AC adapter		ground
plug as required)

AC Leakage Test

ANY MEASUREMENTS NOT WITHIN THE LIMITS OUTLINED ABOVE ARE INDICATIVE OF A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED BEFORE RETURNING THE APPLIANCE TO THE CUSTOMER.

2. PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in the appliance have special safety related characteristics. These are often not evident from visual inspection nor the protection afforded by them necessarily can be obtained by using replacement components rated for voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this Service Manual.

Electrical components having such features are identified by marking with a on the schematics and on the parts list in this Service Manual.

The use of a substitute replacement component which does not have the same safety characteristics as the PIONEER recommended replacement one, shown in the parts list in this Service Manual, may create shock, fire, or other hazards.

Product Safety is continuously under review and new instructions are issued from time to time. For the latest information, always consult the current PIONEER Service Manual. A subscription to, or additional copies of, PIONEER Service Manual may be obtained at a nominal charge from PIONEER.

2

XR-A550MD

2. EXPLODED VIEWS AND PARTS LIST

NOTES: • Parts marked by "NSP" and can not be supplied.

•The mark found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing, be sure to use parts of identical designation.

•Screws adjacent to mark on the product are used for disassembly.

2.1PACKING

		KUCXJ
	9(1/2)	Type Only			KUCXJ	DBDXJ
		12
					Type Only	Type Only
1				4	2	15
			5

7		16
3	13	14

6

9(2/2)

8(1/2)

11

10

8(2/2)

(1) PACKING PARTS LIST

Mark	No.	Description		Part No.	Mark	No.	Description		Part No.
	1	FM Antenna		ADH7004		9	Rear Pad		XHA3004
	2	Operating Instructions		See Contrast table (2)		10	Packing Case		See Contrast table (2)
		(English/French)				11	Packing Sheet		AHG7049
	3	AM Loop Antenna		XTB3001	NSP	12	Warranty Card		See Contrast table (2)
	4	Remote Control Unit		XZN3046		13	Power Cord		See Contrast table (2)
		(CU-XR054)			NSP	14	Polyethylene Bag		AHG7033
	5	Battery Cover		AZA7204		15	Operating Instructions		See Contrast table (2)
NSP	6	Dry Cell Battery (R6P, AA)		VEM-013			(Chinese/portuguese)
	7	Catalog Bag		Z21-038		16	Operating Instructions		See Contrast table (2)
		(0.03 × 230 × 340)					(English/Spanish)
	8	Front Pad		XHA3003

(2) CONTRAST TABLE

XR-A550MD/KUCXJ and DBDXJ are constructed the same except for the following :

Mark	No.	Symbol and Description		Part No.		Remarks
			KUCXJ Type		DBDXJ Type
	2	Operating Instructions (English/French)	XRE3021		Not used
	10	Packing Case	XHD3078		XHD3079
NSP	12	Warranty Card	ARY7023		Not used
	13	Power Cord	ADG7022		ADG1158
	15	Operating Instructions (Chinese/Portuguese)	Not used		XRC3011
	16	Operating Instructions (English/Spanish)	Not used		XRE3022

3

XR-A550MD

2.2 EXTERIOR (1/2)

15

8

9

15

11		11
	14
	KUCXJ Type	9
	Only
		11

Note : Attatch on the same numbers × three 12

12

9

19

1

2

Refer to

"2.5 $M MECHA CD DIGITAL ASSY

6
20	4
10	19
	5

13

3

7

4

XR-A550MD

(1) EXTERIOR (1/2) PARTS LIST

Mark	No.	Description		Part No.
	1	22P F.F.C/30V		XDD3018
NSP	2	$M MECHA CD DIGITAL Assy		XXA3006
	3	Volume Knob		XAA3005
	4	FL Cover A		See Contrast table (2)
	5	FL Cover C		XAK3071
	6	Tray Cap		XAK3075
	7	Display Panel		See Contrast table (2)
	8	Bonnet Case		XZN3001
	9	Screw		BPZ30P100FZK
	10	Pioneer Badge		XAM3001
	11	Screw		VBT30P080FZK
	12	Disc Label		XAX3127
	13	Jog Knob Assy		XXG3023
	14	65 Label		See Contrast table (2)
	15	Screw		BCZ30P080FZK

16• • • • •

17• • • • •

18• • • • •

	19	Cushion Rubber	XEB3002
NSP	20	Tray Cap Assy	XXG3031

(2) CONTRAST TABLE

XR-A550MD/KUCXJ and DBDXJ are constructed the same except for the following :

	Mark	No.	Symbol and Description	Part No.		Remarks
				KUCXJ Type	DBDXJ Type
		4	FL Cover A	XAK3093	XAK3026
		7	Display Panel	XAK3057	XAK3064
		14	65 Label	ARW7050	Not used

5

XR-A550MD

2.3 EXTERIOR (2/2)

18 26

16

19

31 18

19

12

20

27

			19		15
					19
				KUCXJ	24	28
				Type Only
				29		19
				32
19
22			11	7		24
			DBDXJ			24
	25
		3	Type Only			24
			33
			21		6
	2
				17

19

23			14
		30	1
			4
		13
	5	19
9	19
Refer to "2.7 MD
MECHANISM ASSY".
19

10

20

19

8

19

Refer to

"2.4 FRONT PANEL SECTION".

6

XR-A550MD

(1) EXTERIOR (2/2) PARTS LIST

Mark	No.	Description		Part No.	Mark	No.	Description		Part No.
	1	AF Assy		See Contrast table (2)		16	MD MAIN Assy		See Contrast table (2)
	2	SECONDARY Assy		See Contrast table (2)		17	Fan Plate		ANG7153
	3	PRIMARY Assy		See Contrast table (2)		18	Push Rivet		AEC7149
	4	FM/AM TUNER MODULE		AXQ7065		19	Screw		VBZ30P080FZK
	5	Power Transformer (T1)		See Contrast table (2)		20	M3 Plastic Screw		XBB3001
	6	DC Fan Motor		AXM7003		21	Screw		ASZ40P060FMC
	7	Fuse (FU1)		See Contrast table (2)		22	Cord Clamper		RNH-184
NSP	8	Chassis		XNA3002		23	MD SUB Assy		See Contrast table (2)
	9	MD Mechanism Assy		AXA7054		24	Screw		BPZ30P100FZK
	10	MD Bracket R		XNG3011		25	Connector Assy 9P		XDE3008
	11	PCB Bracket		XNG3006		26	Connector Assy 3P		XDE3024
	12	MD Bracket L		XNG3010		27	Separation Sheet		XEC3010
	13	Heat Sink		XNH3003		28	Screw		BBZ30P300FMC
	14	Wire Clip		XEC3002		29	SUB TRANS Assy		See Contrast table (2)
	15	Rear Panel		See Contrast table (2)		30	Binder		ZCA-SKB90BK
					NSP	31	PCB Spacer		AEC7080
						32	Fuse Caution Label		See Contrast table (2)
						33	Fuse (FU2, FU3 : T1.6A)		See Contrast table (2)

(2) CONTRAST TABLE

XR-A550MD/KUCXJ and DBDXJ are constructed the same except for the following :

	Mark No.	Symbol and Description	Part No.		Remarks
			KUCXJ Type	DBDXJ Type
	1	AF Assy	XWZ3172	XWZ3181
	2	SECONDARY Assy	XWZ3173	XWZ3182
	3	PRIMARY Assy	XWZ3175	XWZ3184
	5	Power Transformer (T1)	XTS3030	XTS3028
	7	Fuse (FU1 : 4A)	REK1082	Not used
	7	Fuse (FU1 : T3.15A)	Not used	AEK1059
	15	Rear Panel	XNC3031	XNC3032
	16	MD MAIN Assy	XWZ3177	XWZ3186
	23	MD SUB Assy	XWZ3179	XWZ3188
	29	SUB TRANS Assy	XWZ3176	XWZ3185
	32	Fuse Caution Label	XAX3132	Not used
	33	Fuse (FU2, FU3 : T1.6A)	Not used	AEK1056

7

XR-A550MD

2.4 FRONT PANEL SECTION

		17
	26	22				17
	40	17
	18				6	1
	13	34(1/2)
						17
	10	35			23
		15
				34(2/2)
						7
		24			36
		25
					29
2	17				37	8
	4
	17					41
			19
					17
						17
	3				11
					16
38						9
	30
					39
						17
				21
						20
				14		12
						Refer to
	27	32				"2.8 MECHANISM UNIT".
		33

28

31

8

XR-A550MD

(1) FRONT PANEL SECTION PARTS LIST

Mark No.		Description		Part No.	Mark	No.	Description		Part No.
	1	DISPLAY Assy		See Contrast table (2)		21	Damper Assy		AXA7052
2		MD FRONT Assy		See Contrast table (2)		22	Flap Holder		XMR3004
3		MD LED Assy		See Contrast table (2)		23	Front Panel Assy		XXG3018
4		Flexible Cable 11P		XDD3020		24	Function Button		XAD3020
5		• • • • •				25	CD Button		XAD3010
6		Flexible Cable 13P		XDD3021		26	Eject Button		XAD3023
7		Flexible Cable 11P		XDD3019		27	FL Window MD		XAK3070
8		Flexible Cable 38P		XDD3004		28	Deck Lens R		XZN3063
9		Connector Assy 5P		XDE3002	NSP	29	Jog Lens		XAK3025
10		MD Lens		XAK3073		30	FL Cover MD		XAK3072
11		Deck Bracket		XNG3013		31	Deck Door R		XAN3009
12		Mechanism Unit		XYM3004		32	Front Panel		XMB3015
13		LT Conductor		XAK3074		33	Sub Panel A		XAK3046
14		Door Spring R		XBH3002	NSP	34	Power Button		XAD3007
15		MD Flap		AAN7186		35	Play Button		XAD3022
16		Latch Spring R		ABH7131	NSP	36	S.C. Button		XAD3009
17		Screw		BPZ30P100FZK	NSP	37	TIMER Button		XAD3016
18		MD Spring		ABH7154		38	FL Cover D		See Contrast table (2)
19		Latch Mold R		XMR3002		39	Screw		PCZ20P040FMC
20		GND Plate C		XNG3012		40	Cushion A		PED1001
					NSP	41	Cord with Plug		DE007VE0

(2) CONTRAST TABLE

XR-A550MD/KUCXJ and DBDXJ are constructed the same except for the following :

	Mark No.	Symbol and Description	Part No.		Remarks
			KUCXJ Type	DBDXJ Type
	1	DISPLAY Assy	XWZ3174	XWZ3183
	2	MD FRONT Assy	XWZ3178	XWZ3187
	3	MD LED Assy	XWZ3180	XWZ3189
	38	FL Cover D	XAK3094	XAK3092

9

XR-A550MD

2.5 $M MECHANISM CD

8	Refer to "2.6 SERVO MECHANISM ASSY".
21	25

7

22

14

24

13

23

11

			1
12	26	2	5
	15
	29	19	27
	18		28
16	29	6
10	17

29

3

30

29

29

29

29	9

29

29

10

XR-A550MD

2.6 SERVO MECHANISM ASSY

• $M MECHANISM CD PARTS LIST

Mark	No.	Description		Part No.
	1	MOTOR Assy		AWZ8428
NSP	2	SW Assy		AWZ8429
	3	CD Assy		XWZ3141
	4	• • • • •
	5	Servo Spring		ABH7126
	6	Belt		AEB7072
	7	Clamp Magnet		AMF7001
	8	Yoke		ANB7067
	9	Mecha Base		ANW7125
	10	Loading Tray		ANW7088
	11	Servo Base		ANW7089
	12	Rotary Tray		ANW7113
	13	Clamper		ANW7091
	14	Clamper Holder		ANW7092
	15	Main Cam		ANW7093
	16	Gear Pully		ANW7094
	17	Lock Lever		ANW7095
	18	Planet Gear		ANW7096
	19	Actuater		ANW7097
	20	• • • • •
	21	15P F.F.C/30V		ADD7038
	22	Connector Assy (6P)		ADE7010
	23	Float Rubber A		AEB7063
	24	Float Rubber B		AEB7066
	25	Servo Mechanism Assy		AXA7039
	26	Screw		IPZ30P080FMC
	27	Carriage Motor		VXM1033
	28	Motor Pulley		PNW1634
	29	Ha Narl		GEM1016
	30	Cushion Rubber		XEB3003

	1
	9
	7
9	9
	9

4

5

8

6

3

10

2

• SERVO MECHANISM ASSY PARTS LIST

Mark No.		Description		Part No.
	1	Servo Mechanism		AXA7039
2		SPINDLE MOTOR Assy		AEA7009
3		SLEAD MOTOR Assy		AEA7010
4		Gear A		AEA7013
5		Gear B		AEA7014
6		Screw		AEA7015
7		Screw		AEA7016
8		Screw		AEA7017
9		Screw		AEA7018
10		Leaf Switch		AEA7011

11

XR-A550MD

2.7 MD MECHANISM ASSY

68

16

66

45

8

12

10

5

11

18

	64
29
30
13	64
25

9

22

21

65

65

26

17

57

6

51

4

14

24

58

34

58

A1

2

63 27

40

41

33

19

57

23

57

63

31

48

60

47 PWB-B

49 52

50

15

59 x2

32

59 x2

46

B2

B1

A2

B1

A1

3

A2

38

20

57	38
	62

62

1

7

67 x4

35

66

39

37

62

B2

37

62

42

43

28

PWB-A

66

55	54	66	36

53

61 x3

12

XR-A550MD

• MD MECHANISM ASSY PARTS LIST

Mark No.		Description		Part No.	Mark No.		Description		Part No.
	1	Loading Gear Shaft		1242900108		36	Bottom Cover		1243230028
2		MD Guide (B)	1242000209		37		Cushion (A)	1243260020
3		Base Frame	1242000210		38		Cushion (B)	1243260021
4		Flat Cable 5P (CW1901)	1245120287		39		Cushion	1243260097
5		Cartridge Holder	1242140138		40		Magnet Head	1246100008
6		Cam Plate Lever	1242480122		41		Pickup	1246170019
7		H/A Shift Arm	1242480123		42		MD Flexible Cable (24P)	1245120301
8		Holder Arm	1242480124		43		Connector Assy	1245120299
9		Roller Arm Lever	1242480125		44		• • • • •
10		Clamper Lever	1242480126		45		Head Guard Sheet	1244030163
11		Catch	1242480127		46		Drive Chassis	1242070047
12		Slider Lever	1242480128		47		PWB-B	1245210149
13		Roller Holder Spring	1242580157				(MD Mechanism Switch Assy)
14		Spring	1242580159		48		Push Switch (SW1956)	1245300025
15		Shift Arm Spring	1242580053		49		Push Switch (SW1954)	1245300026
16		Holder Arm Spring	1242580054		50		Push Switch (SW1955)	1245300026
17		Rack Spring	1242580055		51		Push Switch (SW1952)	1245300027
18		Catch Spring	1242580094		52		Slide Switch (SW1953)	1305301315
19		Spring (A)	1242580160		53		Spindle Motor (M901)	1246300048
20		Drive Shaft Spring	1242580161		54		Sled Motor (M902)	1246300049
21		Roller Arm Spring	1242580093		55		Loading Motor (M903)	1246300050
22		Loading Gear (B)	1242810063		56		• • • • •
23		Drive Gear	1242810064		57		Screw	1249700161
24		Loading Gear (A)	1242810065		58		Screw	1249700162
25		Roller Gear	1242810066		59		Screw	1249700163
26		Rack Gear	1242810067		60		Screw	1249700061
27		Connector 2P (CN1903)	1245120288		61		Screw	1249700065
28		PWB-A (MD Main Assy)	1246840167		62		Screw	1249700076
29		Roller Holder	1242860001		63		Screw	1249700108
30		Transfer Roller	1242870014		64		Washer	1249900005
31		Drive Shaft	1242900105		65		Washer	1249900006
32		Pickup Guide Shaft	1242900040		66		Screw	1189700020
33		MD Guide (A)	1242000208		67		Screw	1249700077
34		Pickup Slide Shaft	1242900039		68		Screw	1249700011
35		Top Cover	1243230027

13

XR-A550MD

2

9

10

12

13

1

14

XR-A550MD

5

6

8

11

• MECHANISM UNIT PARTS LIST

Mark No.		Description		Part No.
	1	Plate HD BLK		F513-811
1		Plate HD BLK		F513-825
2		Motor Main BLK		F525-324
3		• • • • •
4		• • • • •
5		Clutch Assy BLK		F522-037
6		Main Belt		FF17G-31
7		• • • • •
8		Clutch Assy BLK		F522-045
9		Roller Pinch BLK R		F514-129
10		Roller Pinch BLK L		F514-130
11		F/R Belt		FF18W-12
12		Plate Base BLK		F512-127
13		Plate Base BLK		F512-128

15

	1		2		3		4

XR-A550MD

3. SCHEMATIC DIAGRAM
3.1 OVERALL WIRING DIAGRAM		O DISPLAY ASSY
A	DECK MECHA
DECK I		(KUCXJ TYPE : XWZ3174)
R/P HEAD		(DBDXJ TYPE : XWZ3183)
L R	ERASE
	HEAD

B

A

FM/AM TUNER

MODULE (AXQ7065)

K K 1/3 K 3/3

AF ASSY

(KUCXJ TYPE : XWZ3172) (DBDXJ TYPE : XWZ3181)

C

B CD ASSY (XWZ3141)

D C

	MOTOR	D	SERVO MECHANISM ASSY
	ASSY
		SW ASSY	(AXA7039)
	(AWZ8428)
		(AWZ8429)	$M MECHA CD DIGITAL ASSY(XXA3006)

L SECONDARY ASSY (KUCXJ TYPE : XWZ3173) (DBDXJ TYPE : XWZ3182)

T1	POWER TRANSFORMER	XTS3030KUCXJTYPE:	M
			XTS3028TYPEDBDXJ:
			PRIMARY ASSY
			(KUCXJ TYPE : XWZ3175)
			(DBDXJ TYPE : XWZ3184)

16

	1		2		3		4

	5		6		7		8

XR-A550MD

Note : When ordering service parts, be sure to refer to "EXPLODED VIEWS and PARTS LIST" or "PCB PARTS LIST".

I MD LED ASSY

(KUCXJ TYPE : XWZ3180)

(DBDXJ TYPE : XWZ3189)

H

MD FRONT ASSY (KUCXJ TYPE : XWZ3178) (DBDXJ TYPE : XWZ3187)

MD MECHANISM ASSY (AXA7054)

E PWB-A (MD MAIN ASSY) (1246840167)

F PWB-B (MD MECHANISM SWITCH ASSY) (1245210149)

CN1902

CN3331

A

B

J

J3651

MD SUB ASSY

(KUCXJ TYPE : XWZ3179) (DBDXJ TYPE : XWZ3188)

N

SUB TRANS ASSY (KUCXJ TYPE : XWZ3176) (DBDXJ TYPE : XWZ3185)

AN1

Y2

FU1

Y1

AXM7003

NEUTRAL

LIVE

AC POWER CORD KUCXJ TYPE : ADG7022 DBDXJ TYPE : ADG1158

CN1904

C

G

MD MAIN ASSY

(KUCXJ TYPE : XWZ3177) (DBDXJ TYPE : XWZ3186)

XDE3024

D

17

	5		6		7		8

	1		2		3		4

XR-A550MD

3.2 FM/AM TUNER MODULE

A

MIX AMP

RF AMP

1T378A

OSC

1T378A

BUFFER

B

IF AMP

FM +B SW

C

MW RF TUNING BLOCK

AXX7041

FM/AM TUNER MODULE (AXQ7065)

D

18 A

	1		2		3		4

	5		6		7		8

XR-A550MD

A

AF AMP

AF AMP

B

K 2/3 CN3051

REGULATOR

C

PLL

D

A 19

	5		6		7		8

	1		2		3		4

XR-A550MD

3.3 CD, MOTOR and SW ASSEMBLIES

A

B

R8123

56k

C

B CD ASSY (XWZ3141)

				C MOTOR ASSY
				(AWZ8428)
				CARRIAGE MOTOR
D
				J8503
		SERVO MECHANISM ASSY (AXA7039)		D20PWW0405E
20	B C
	1	2	3	4

	5		6		7		8

XR-A550MD

			Note: The encircled numbers
			denote measuring point in the
1	2		schematic diagram.
			1	A
				CN8005Pin 1 :
				PLAY MODE (RF)
				H : 500nsec/div
	C8371	100/10		1.8Vp-p
				VREF
			2	CN8005Pin 2 :
				TEST MODE,
		0.047		Tracking Open(TRER)
	YB			H : 5msec/div
	C8308
	1000p			1.0Vp-p
	C8307			VREF
	1000p
	YB	H
		47	VREF:CN8005Pin3
		L8371
				B

K 2/3 CN1052

C8256 0.1

C8255 0.1

C

	2SB1237X	2SB1237X
	C8257	0.047
	0.1
	2SD1858X	2SD1858X

D

D

	SW ASSY
J8502	(AWZ8429)

B D 21

	5		6		7		8

	1		2		3		4

XR-A550MD

3.4 PWB-A (MD MAIN ASSY) and PWB-B (MD MECHANISM SWITCH ASSY)

E PWB-A (MD MAIN ASSY)(1246840167)

R1211

220

SYRS

SYRD

SYWR

SYD7

SYD6

SYD5

SYD4

SYD3

SYD2

SYD1

SYD0

TP1141

1

A

TP1131

C1111 C1110

C1107

C1109 1

TP1275

POUT

0.015

0.47

0.0047

C1106

TP1142

0.47

48

47

46

45

44

43

42

41

40

39

38

37

100

99

98

97

96

95

94

93

92

91

9

GOUT

ATTR

EFMAGI

EFMAGC

AGND

AVCC

EFMI

EFMO

RF2-1

ADAGI

SYD7

SYD6

SYD5

SYD4

SYD3

SYD2

SYD1

RF2

1

EFM

ADAGC

36 ADIPI

TP1140

TP1274

1 EFMMON

R

AGC

R1155

4

2

AVCC

RF1

ADIPO

56K

EFMO-I

EFMO-I

C1202

2

&

35

TP1139

1

3

EFMI

100

99

98

RF4

DIFF

AOUT-IN

AOUT-IN

4 AGND

SYRS

SYRDX

SYWRX

3

SW

34

5 AIN

EOUT-IN

EOUT-IN

6

EIN

RF3

DIFF

ADLPFO 33

TCG

TCG

4

7 TCG

C1102

TP1138

BOUT-IN

BOUT-IN

8

BIN

1

REFI

IC1101

ADIP

22KO 32

FOUT-IN

FOUT-IN

5

9 FIN

C1103

IR3R55

AGC

10

VBAT

1

6

RF PROCESSOR

22KI 31

5

WBO-I

WBO-I

11 WBI

REFO

C1211

12 VDD1

7 RFADD

WBO

270P(CH)

1

BIAS

LPF

HPF

30

R1102 TP1137

13 DGND

C1104

C1116

14 TEST0

0.027

8

TCGI

TCGO

560

270P(CH)

ENCOD

R1105

29

TP1136

R1154

15 TEST1

TP1220

16 TEST2

390K

9

AIN

AOUT

22K

R1653

28

17

X176KO

TP1135

R1153

FODRF

100K

BIN

22K

C1115

C1114

270P(CH)

FODRR

18

FODRF

10

BOUT

27

R1152

270P(CH)

R1651

100K 19

FODRR

TP1134

TRDRF

R1657

120K 20

TRDRF

EIN

22K

TRDRR

11

LOGIC

EOUT

26

R1151

R1655

120K 21 TRDRR

RAA3

RAA2

RAA1

TP1133

SLDRF

R1661

82K

22

SLDRF

12 FIN

FOUT

22K

SLDRR

R1659

82K

25

R1150

23

SLDRR

BIAS

AVCC

STBY

DISC

SGAIN

AGND

DGND

DTEMP

LATCH

CLOCK

DATA

DVCC

TP1132

C1113

C1112

270P(CH)

SPDRF

R1665

62K

24

SPDRF

26

27 28

22K

SPDRR

RAA10

BIN

AIN

RF1

EIN

RF3

RF4

RF2

13

14

15

16

17

18

19

20

21

22

23

24

R1663

25 SPDRR

RAA0

VDD2

RAA4

RAA5

RAA6

RAA7

FIN

DTEMP

CLOCK

62K

C1105

LATCH

DATA

26

27

28

29

30

31

32

33

34

35

3

1

TP1129

11

C1210

1

TP1130

10

A3

A2

A1

A0

A4

A5

A6

A7

A8

B

TP1150

TP1215

L1102

0.47 H

H

C1121

L1101

10

1

C1206

1

R/P

R/P

1

C1145

R1166

0.033

1.2K

R1100

27

C1101

R1107

1

4.7

1

FN

TP

FP

TN

A4

A5

TP1128

TP1127

TP1126

TP1123

R1106

TP1120

TP1119

TP1118

TP1116

TP1115

TP1114

TP1113

TP1112

TP1111

TP1109

TP1108

TP1107

TP1106

TP1105

TP1104

TP1103

TP1102

TP1101

A6

10K

A7

A8

28

27

26

25

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

CN1101

Flexible

26 LVVOUT 25 APCOUT 24 LDVCC 23 DGNG 22 DGND 21 LDON

20 LDVAR

12 VCC 11 AGND 10

APCIN DGND

LVVIN

3

LDVAR

LDON

PCB

28 +2.8V 27 B

18 COM I/V 17 RF1

I/V 14 RF3

I/V 13 RF4

MP/R

RF2

SW

19 A

16 F

15 E

F-

T+

F+

T-

TP1404 DTEMP

9

I/V 8

7

6

5

4

3

2

1

2 12

T.COOL

F.COOL

R1401

VREF3.2V

MINF

1K

R1430 10K

TP1458

TP1455

TP1456

TP1457

HINF

TP1405

R1423

R1404

10K

R1429

R1422

R1426

R1428

C1402

1K

10K

10K

R1424

L1251

1K

0.047

R1472

10K

1K

TP1251

47uH

R1223

47K

R1418

C1252

C1251

680

100

99

98

97

96

95

94

93

92

91

90

89

88

87

86

85

84

83

82

81

47K

120P

AVCC

VREF

HINF

GND

TESTK2

TESTK1

MINF

DTEMP

AVCK1

AVCK2

AVCK3

TEST0

TEST1

TEST2

DOUTMT

MUTE

DAMUT

1

(CH)

0.027

R1251

EFMO TP1260

MINF

HINF

1

XRST

80

XRST

LDOUT

2

10

IC1251 74ACT02F TP1255

1

VCC

8

REC HEAD

CN1252 TP1252

2

DIGCD

79

2

EXT.C

GND

7

Q1251

D

D

G

LDVAR

3

LDVAR

DIGEX 78

2SK2909

9

8

82

81

3 APC

6

G

Q1252

C1254 10

C1255 4.7

14

13

12

11

10

R1406

4

ADJS

DFS1 77

L.DON

S

S

4 LVV

5

D1251

SB0209CP

2SK2909

VCC

3.3K

5

EMPH

ADMUT

DFS0 76

L.DVAR

D1252

C

SB0209CP

6

LOAD IN

DAPON 75

GND

R1420

Q1254

7

ERROR

ADPON 74

1K

C1423

0.022

D

D

2SK1473

8

BYTE

A/B 73

G

1

2

3

4

5

6

7

MD LIGHT PICKUP

G

9

CNVSS

LDON 72

HDON

S

Q1253

S

10

STID OUT

PCNT1 71

TP1416

2SK1473

RESET

11

SEACH OUT

PCNT0 70

LOADING

C1401 0.047

12

RESET

69

R1427

4.7K

HDON

13

IC1401

68

TP1413

14

VSS

L3CLK

67

R1425

MCCK

IX0232

TP1414

15

MCCK

L3MODE

66

LEAD IN

1

LEAD IN

TP1605

LEAD IN

2.7K

C1403

680P

R1415

MD SYSTEM

TP1415

1

16

VCC

L3DATA

65

HINF

HINF

TP1604

HINF

MICRO-COMPUTER

C1406

R1902

2

2

17

GND 64

R1408 100K

DINT1K

1

DILECT

1.8K

GND

3

CN1601

GND

18

DINT

63

LOADING

4

3

LOADING

TP1602

LOADING

LOADIN

DSENSE

VCC

R1476

R1901

4

19

DSENSE

62

MINF

MINF

TP1601

MINF

1K EE

SW1952

5

5

ST-ID

EEPK 61

470

C1421

C1422

TP1616

C1412

SERCH

20

EE

21

SERCH

EEPD

60

CN1901

0.022

0.022

680P

EP

22

MDRSW

EPCS

59

LEAD IN

R1474

P

23

FSW

EEPRO

58

Q1601

C1605

1K

R1413

VARI-P SW

SW1953

2SA1314C

3.3K

24

57

R1903 820

100/10

25

P-DOWN

SYSD5

SYSD4

56

C1604

R1610

R1613

R1614

R1407

LATCH

PLAYBACK

26

HDON

DATA

55

C1610

56P(CH)

30K

27K

18K

LD+

3.3K

SYSD0

SYD0

R1904

R1617

10

R1611

LD–

27

LD+

54

SYD1

SW1954

820

R1609

28

LD–

49

50

SYSD1

53

47K

1.5K

12K

CIN

31

32

SYD2

CIN

35MDDATA

SYSD2

29

384M/16M

52

RECORDING

INNSW

33CLOCK

36KDATA

46SYWR

47SYSD7

48SYSD6

SYD3

30

INNER

34DSTB

37DSCK

44SYRS

45SYRD

SYSD3

51

R1612

R1409

1K

C1424

0.022

39R/P

40FOK

TP1454

42S2

43S1

SW1955

56K

31

32

41

49

50

LOADING

R1656

C1653

820P(J)

R/P

J1405

6.8K

1 REG+

CH3IN

42

R1662

10K

DATA

LATCH

CLOCK

MDDATA

KDATA

R1471

10K

C1656

10K

DSTB

DSCK

SYRD

SYWR SYD7

SW1956

2

REGB

+

OUT3

41

SYRS

SYD6

SYD5

SYD4

FOK

IN1+

–

IN3–

0.0056

SPDRR

R/P

F

PWB-B

3

1.25V

40

16

TRDRF

C1601

4 VBS1

VBS2

39

MD MECHANISM

TRDRR

4.7

Vm1 5

Vm2

38

R1654 6.8K

IN1– 6

OUT1

37 IN3+

C1602

C1657

SPDRF

SWITCH ASSY

C1652

7

36

VM3–

4.7

0.0056

R1664

10K

(1245210149)

TN T–

VM1–

35

STID

TP

T+

820P(J)

8

SPN

15

9

34

VM1+

VM3+

SPP

R1414PRO EEPD

EEPK

EPCS

VREF

Q1402

10 GND

GND

33

1

11 VM2+

32

RNC1404

IC1402

FP

F+

2

3

2

3

12

31

1

S29294A

M901

+

FN

F–

13

30VM4+

2

2

3

Q1401

1

5 DI

SK

4

D

CN1602

C1651

820P(J)

VM2–

VM4–

SLP

C1654 0.015

R1658 15K

C16550.015

R1660 15K

3

C1407 0.022

R1416

10K

6 DATA CS

3

MD

M

SLD+

R1652

14 OUT2

29

VREF

R1412

100K

RN2404

SPINDLE MOTOR

–

1

1

TP1607

15 IN2–

28VM5+

SLN

LD–

Q1403

1

Q1404

10K

7 GND VCC

2

R1473

2

2

SLD–

TP1606

FODRR

10K

16 IN2+

27VM5–

8 PRTCT

1

100K

OUT5

RN2404

RNC1404

C1405

FODRF

17 MUTE1

IN5– 26

LD+ SLDRR

E2-PROM

0.1

CN1603

C1650

820P(J)

R1650

18 MUTE2

25

SLDRF

M902

+

SP+

10K

IN5+

M

1

1

TP1608

19 SS.GND

IN4+

24

MD

SP–

R1667

THREAD MOTOR

–

2

2

TP1609

20

VREF

23

TP1612

IN4–

22K

R1666

CN1604

TP1610

C1631

21 VREFO

OUT4

22

R1668

6.8K

R1669

22K

C1661

L1601

IC1601

100/10

1 H

M903

+

1

1

TRY+

1

6.8K

TRY–

M56758FP

M

2

2

MD

TP1611 C1609

1 SPN

SPP

SLP

SLN

5ch MOTOR DRIVER

LOADING MOTOR

–

22	E		F	For details regarding schematic diagram caution items, refer to page 24.

	1		2		3		4

	5		6		7		8

XR-A550MD

R1211

C1208

220

0.047

6

SYRS

SYRD

SYWR

SYD7

SYD6

SYD5

SYD4

SYD3

SYD2

SYD1

SYD0 TP1204

XRST

C1209DINT 1

R1210CIN 100

FOK

TP1218

TP1217

MCCK

DSENSE

275

100

99

98

97

96

95

94

93

92

91

90

89

88

87

86

85

84

83

82

81

80

79

78

77

76

EFMMON

SYD7 SYD6 SYD5 SYD4 SYD3 SYD2 SYD1 SYD0

RSTX

DGND

VDD1

DINTX

MCCK

COUT

SENSE

FOK

SFSY

SBSY

SBO

FEMON

AVCC

DADATA

EFMI

100

99

98

13

78

77

76

ADDATA

14

SBCK

TEMON

TOTMON

EIN

SYRS

SYRDX

SYWRX

LRCK

AGND

DFCK

AIN

BCLK

TCG

18

DGND

BIN

VDD3

FIN

19

DOUT

VBAT

DIN

WBI

21

XO

VDD1

IC1201

XI

DGND

20

DGND

LR37648A

TEST0

VDD1

ENCODE/DECODE/ATRAC

TEST1

17

VPD

TEST2

VXI

X176KO

CDBCLK

FODRF

CDLRCK

FODRR

RAA3

RAA2

RAA1

48ACRCER

49PLCK 50EFMO

CDDATA

TRDRF

TEST4

TRDRR

TEST3

SLDRF

TESO1

SLDRR

26

27

28

EXPORT1

SPDRF

RACASX

RARASX

EXPORT0

RAA0

RAA10

VDD2

RAA4

RAA5

RAA6

RAA7

RAA8

RAOEX

DGND

RAD2

RAD3

RAA9

RAWEX

RAD1

RAD0

TCRS

SPDRR

X700KO

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

C1210

1

TP1212

TP1213

TP1214

A3

A2

A1

A0

A4

A5

A6

A7

A8

A9

TP1215

A3

A2

A1

A0

A9

C1206

10

9

8

7

6

5

4

3

2

1

1

VCC

A3

A2

A1

A0

A9

RAS

WE

I/O2

I/O1

IC1202

IX2474AF

4M bit D-RAM

CAS

I/O3

I/O4

GND

A4

A5

A6

A7

A8

OE

11

12

13

14

15

16

17

18

19

20

A4

A5

A6

A7

A8

2V

R1423

10K

R1424

10K

R1418

85

84

83

82

81

47K

VREF3.2V

DOUTMT

EMPH

ADMUT

DAPON

75

MUTE

DAMUT

XRST

80

XRST

DIGCD 79

82

81

DIGEX 78

DFS1 77

DFS0 76

ADPON 74

A/B 73

R1478

LDON

72

LDON

10K

PCNT1 71

TP1416

PCNT0

70

PCNT0

69

68

TP1413

L3CLK

L3CLK

67

TP1414

L3MODE

L3MODE

66

TP1415

R1475

L3DATA

L3DATA

65

C1406

1K

GND 64

1

CON 3.2V

63

R1476

TP1412

VCC

62

1K

EEPK

EEPK 61

EEPD

EEPD

60

EPCS

EPCS

59

R1474

PRO

EEPRO

58

1K

57

Q1820

SYSD5

SYSD4

SYSD0

56

2SA1162G

54

55

SYD0

49

50

SYSD1

53

SYD1

SYD2

R1827

SYSD2

52

Q1821

46SYWR

47SYSD7

48SYSD6

49

TP1454

270

50

1

SYSD3

51

SYD3

RNC1407

3

2

SYWR SYD7

Q1822

2

SYD6 SYD5

SYD4

RNC1407

1

3

IC1402

EEPK EPCS

PCNT0

S29294A

5 DI

SK

4

6 DATA CS

3

R1473

7 GND VCC 2

100K

8 PRTCT

1

C1405

0.1

E2-PROM

PCNT0

7

6 – 9 insert

100K

circuit and measure.

270P

TP1210

9

TP1216

75

DADATA

74

RC120

ADDATA

73

220

DFCK

72

BCLK

71

C1207

LRCK

70

1

23

22

69

R1254

68

67

220

66

R1202

65

C1203

1M

64

R1281

1

47

XL1201

62

R1201

63

150

C1205

C0001AW

61

C1204

60

12P

12P(CH)

AND GATE

(CH)

59

TP1273

00

R1262

10K

TP1278

AND GATE

C1951

IC1916

58

IC1906

TP1911

74VHC08F

TC7ST08F

57

8

GND 7

R1269

56

9

6

55

TP1279

1

Vcc 5

0.047

10

5

2

4

54

11

R1263

53

R1261

3

GND

4

12

3

10K

10K

2

52

13

R1266

14 Vcc

1

51

10K

R1967

R1969

8

47

C1958

56

C1927

0.047

R1964

6.8K

0.047

C1954

15P

R1963

1

REF

VDD 16

C1957

(CH)

R1221

1.5K

2 PD

LOCK 15

100/6.3

220

R1965

R1961

100

3 VDDA

S2 14

10K

C1964 0.001

R1962

220K

4 AMPI

S1 13

5 AMPO

M2 12

C1952

6 VSSA

M1 11

0.01

0.47

C1955 0.047

C1956 47/6.3

7

XI

CKO 10

R1968

C1953

8 NC

VSS 9

220

IC1907

TC9246F

CLOCK

GENERATOR

1

Vcc 14

C1992

2

13

0.1

3

12

D1990

4

11

1SS372

5

10

C1991

DADATA

ADDATA

LRCK

BCLK

6

9

DFCK

C1990

10

7 GND

8

1

L1201

0.47H

L1203

IC1990

4.7 H

74AC04FS

INVERTER

TP1713

TP1712

R1712

100K

C1711

24

0.01

C1716

0.01

L3DATA

28

27

26

25

24

23

22

21

20

19

18

17

16

15

C1710 47/4

VREFD

VSSO

VOUTL

VDDO

VOUTR

AVDD

AVSS

TEST2

TEST3

DATAI

DATAO

WS

BCK

L3DATA

IC1701

UDA1340

C1709

AD/DA CONVERTER

L3MODE

VSSA

VDDA

VINL

VREFA

VINR

VADCN

VADCP

TEST1

OVERFL

VDDD

VSSD

SYSCLK

L3CLK

0.047

1

2

3

4

5

6

7

8

9

10

11

12

13

14

22/4

TP1701

C1701

C1713

C1715

22/4

C1743

C1700

0.01

C1714

47/4

39K

TP1711

C1717 0.01

L3CLK

39K

C1702

TP1710

0.047

L3MODE

R1713

R1714

47/4

0.01

L1702

R1701

R1702

C1703

10 H

1M

680K

47/4

L1701

C1712

AA.GND

TP1702

10 H

Q1701

47/4

R1710

2SC2412KR

30K

C1706 10/16

R1711

1

3

C1720

R1715

C1707

39K

0.01

1K

10/16

R1716

R1717

IC1802 820

3.3K

2

AA.GND

NJM431U

C1810

1

AA.GND

BUCKUP

BUCKUP

REGULATOR

Q1807

VREF3.2V

2SA1314C

TP1802

C1806 10

R1821

R1820

220/4

1

1

C1807

R1809

R1808

390

27K

PWB-B
(MD MECHANISM SWITCH ASSY)
SW 1952: DIRECT	ON-OFF
SW 1953: LEAD IN	ON-OFF	A
SW 1954: PLAYBACK	ON-OFF
SW 1955: RECORDING ON-OFF
SW 1956: LOADING	ON-OFF

	R1927				CN1904
	22	DOUTO TP1901		1	DIGOUT	G CN4101
	C1913 22P		TP1902
		(CH)		3	GND
			TP1904
				2	GND
	R1974			4	DIGIN
	220
	R1973
	6.8K

B

: MD PLAYBACK SIGNAL

: MD RECORDING SIGNAL

C

R1947

47

BUCKUP

JC121

0.047

PDOWN

	4		3
			2	C1805
	5		1		1		R1806
		IC1801			TP1803		12
							R1807
						Q1804		C1704
	XC62EP32				2SA1162G		12	1
	REGULATOR				Q1806	R1810	R1811
					RNC1404	1K	27K
					3	2
						1
		Q1801
TP1801		2SA1314C
R1804			R1801	1.8K	C1801
220K	C1803 10	C1802 100/10			2.2
R1805			R1802		P.GND
100K			270
	3	2	2	3
Q1803		1	1	Q1802
RN1406				RN1406

					R1939				TP1501
					1K
					R1456
			LOADIN			1K
			RESET		Q1451				TP1502
			2		RNC1407				TP1503
					3	R1452
				1			3.3K		TP1504
			STID					TP1505	R1454 1K
			DSCK					TP1506	R1458 6.8K
			SERCH					TP1507	R1460 6.8K
			KDATA					TP1508	R1462 6.8K
			MDDATA		10K	10K		TP1509	R1464 220
			DSTB					TP1510	R1466 220
			R1463		R1461	R1459		0.047	TP1511
			0.33						TP1512
			10K					C1425
		C1904
								D.GND
		C1460							TP1515
			LR190			L1950		JC196
		1							TP1516
			4.7 H			1 H		00
						TP1518			TP1517
			R1995						TP1519
			2.2K			TP1520
		R1731	R1994						TP1521
		47	2.2K						TP1522
	R1707	R1733	C1729						TP1523
	4.3K	47	220P			C1724			TP1524
R1708	R1735	R1734						JC171
						100P
4.3K	47K	47K				(CH)		00	JC170
			CJ172 C1722			AA.GND			00
			220P	100P
			(CH)	(CH)

MD FLEXIBLE PCB

		CN1902	1	G
	1	PDOWN
	2	BUCKUP
	3	LOAD SW
	5	MD-ST		CN4002
	4	RESET
	6	DSCK
	7	SERCH
	8	KDATA
	9	MDDATA
	10	DSTB
	11	D.GND
	12	D.GND
	13	D.GND
	14	D.GND		D
	15	DVDD
	16	DVDD
	17	AVCC
	18	L IN
	19	AA.GND
	20	R IN
	21	AD.GND
	22	L OUT
	23	AA.GND
	24	R OUT	24

1 –24 are waveform Nos. on page 25 and 26.	E	23

	5		6		7		8

XR-A550MD

Voltages of PWB-A (MD MAIN ASSY)

Q1801

IC1907

IC1401

Q1251

IC1101

IC1201

IC1601

PIN

PIN

VOLTAGE

PIN

VOLTAGE

PIN

VOLTAGE

PIN

VOLTAGE

PIN

VOLTAGE

PIN

VOLTAGE

PIN

VOLTAGE

PIN

VOLTAGE

VOLTAGE

NO.

NO.

NO.

NO.

NO.

NO.

NO.

NO.

NO.

D

4.4V

E

5V

1

2.8V

1

0.7V

1

1.48V

51

58V

1

0V

51

0V

1

1.25V

S

1.4V

C

5V

2

2.6V

2

0.7V

2

0V

52

0V

2

0V

52

0V

2

4V

G

2.6V

B

43V

3

4.9V

3

0.7V

3

1.6V

53

0V

3

0.2V

53

0V

3

1.5V

4

2.6V

4

0.7V

4

0V

54

58V

4

3.2V

54

0V

4

5.5V

Q1802

5

1.6V

5

1.6V

5

1.36V

55

0V

5

0V

55

0V

5

5.5V

PIN

VOLTAGE

6

0V

6

1.6V

6

1.77V

56

0V

6

0V

56

0V

6

1.5V

Q1252

NO.

7

7

7

57

7

57

PIN

VOLTAGE

E

0V

0V

0.7V

1.6V

3.2V

3.1V

0V

7

5V

NO.

8

4.9V

8

1.6V

8

1.36V

58

3.2V

8

0V

58

0V

8

2.7V

D

4.4V

C

0V

9

0V

9

1.6V

9

1.77V

59

3.2V

9

0V

59

3.2V

9

2.8V

S

1.4V

B

0.15V

10

2.2V

10

1.6V

10

1.25V

60

3.17V

10

0V

60

0V

10

0V

G

2.6V

11

5V

11

1.6V

11

1.6V

61

0V

11

0V

61

3.2V

11

0V

Q1803

PIN

12

5V

12

1.6V

12

3.17V

62

3.17V

12

3.18V

62

3.2V

12

2.7V

13

13

63

13

63

Q1253

NO.

VOLTAGE

0V

13

3.2V

0V

0V

144V

0V

13

2.76V

E

0V

14

3.2V

14

3.2V

14

0V

64

1.3V

14

0V

64

0V

14

1.6V

PIN

VOLTAGE

C

0V

15

3.1V

15

0V

15

0V

65

1.3V

15

1.5V

65

3.2V

15

1.6V

NO.

B

3.1V

16

5V

16

Groove:3.2V

16

0V

66

DIC input:1.58V

16

3.2V

66

3.2V

16

1.6V

D

15V

Pit:0V

17

1.45V

Other:0V

17

3.2V

67

3.2V

17

3.15V

S

0V

17

Low-reflectance:

18

1.56V

67

1.58V

18

3.1V

68

0V

18

3.15V

G

2.6V

Q1807

IC1990

0V

19

1.62V

68

3.17V

19

0V

69

0V

19

0V

PIN

VOLTAGE

PIN

High-reflectance:

20

69

20

0V

70

3.1V

20

NO.

VOLTAGE

1.7V

0V

1.6V

Q1254

NO.

3.2V

21

1.5V

70

1.5V

21

0V

71

0V

21

1.6V

E

3.95V

1

PIN

VOLTAGE

1.45V

18

0V

22

1.63V

71

1.55V

22

3.15V

72

3.1V

22

1.6V

C

3.2V

2

1.7V

19

0V

23

1.53V

72

1.5V

23

3.2V

73

97A:0V

23

1.23V

NO.

B

3.3V

D

15V

3

1.45V

20

1.45V

24

1.8V

73

0V

24

0V

97B:3.2V

24

1.23V

S

0V

Q1820

4

1.7V

21

3.2V

25

1.4V

74

1V

25

3.2V

74

0V

25

1.6V

G

2.6V

PIN

VOLTAGE

5

1.45V

22

0V

26

1.2V

75

1.55V

26

3.2V

75

3.2V

26

1.6V

NO.

6

1.7V

23

0V

27

2.5V

76

1.8V

27

0V

76

3.2V

27

1.62V

E

3.2V

7

0V

24

3.2V

28

0.8V

77

1.56V

28

0V

77

0V

28

2.7V

C

3.18V

8

1.7V

25

1.78V

29

1.8V

78

0V

29

2V

78

0V

29

2.8V

B

2.4V

9

1.45V

26

1.78V

30

1.4V

79

0V

30

3.2V

79

0V

30

2.7V

Q1821

10

1.37V

27

1.35V

31

3.2V

80

3.16V

31

0V

80

3.15V

31

2.7V

11

1.7V

28

1.36V

32

1.2V

81

0V

32

3.2V

81

0V

32

0V

PIN

12

IC1701

VOLTAGE

1.37V

29

1.6V

33

2.5V

82

0V

33

0V

82

0V

33

0V

NO.

13

1.7V

30

1.6V

34

83

34

0.8V

83

3.2V

34

PIN

VOLTAGE

E

0V

1.3V

0V

3.0V

NO.

14

31

35

84

3.17V

1.6V

35

1.7V

84

1.5V

2.2V

3.2V

35

2.4V

1

0V

C

0V

32

1.6V

36

1.3V

85

1.5V

36

0.2V

85

3.2V

36

0V

2

3.2V

B

3.08V

33

1.6V

37

2.2V

86

3.1V

37

2.3V

86

3.2V

37

1.64V

3

1.4V

34

0V

38

0V

87

3.17V

38

0V

87

3.2V

38

5.5V

Q1822

35

1.6V

39

2.4V

88

0V

39

PLAY:3.15V

88

3.2V

39

5.5V

4

1.5V

PIN

VOLTAGE

36

1.6V

40

1.2V

89

3.17V

REC:0V

89

1.7V

40

1.64V

5

1.4V

NO.

6

0V

37

0.3V

41

1.1V

90

0.5V

40

0V

90

1.8V

41

1.68V

E

0V

38

1.6V

42

1.5V

91

0.6V

41

0V

91

1.8V

42

1.68V

7

3.2V

C

0V

39

1.6V

43

2V

92

0.4V

42

0V

92

1.4V

8

0V

B

0.1V

40

1.6V

44

3V

93

0.4V

43

3.2V

93

Low-reflectance:

9

0V

41

1.6V

45

1.1V

94

0.4V

44

0V

2.2V

10

3.2V

Q1451

42

11

0V

3.2V

46

1.1V

95

0.9V

45

0V

High-reflectance:

PIN

VOLTAGE

43

47

96

46

IC1251

12

1.5V

NO.

0V

0V

0.7V

3.15V

0.1V

13

3.17V

44

1V

48

97

47

0V

94

3.2V

PIN

VOLTAGE

E

0V

IC1202

3V

0.8V

NO.

14

3.17V

45

1.6V

49

98

48

0V

95

3.2V

C

3.18V

PIN

VOLTAGE

1.56V

3.16V

1

2.6V

15

3.17V

46

50

99

49

0V

96

NO.

1.6V

PLAY:0V

0V

B

0.1V

47

3.15V

50

2

2.6V

16

1.55V

0.7V

REC:1.5V

100

0V

0V

97

2V

Q1401

1

1.1V

48

0.7V

98

3.2V

3

0.1V

17

3.17V

PIN

2

1.1V

99

3.2V

4

2.6V

18

0V

NO.

VOLTAGE

3

3V

100

0V

5

2.6V

19

1V

4

2V

6

20

0V

IC1801

0.1V

E

3.2V

C

3.2V

5

1.5V

PIN

VOLTAGE

7

0V

21

0V

6

22

B

0V

1.8V

NO.

8

1.56V

0V

7

0.8V

9

23

3.2V

1

0V

0.1V

8

2.4V

2

44V

10

2.6V

24

1.57V

Q1402

9

1.2V

Q1404

11

25

3.2V

3

3.2V

1.56V

PIN

VOLTAGE

10

3.2V

PIN

VOLTAGE

12

26

1.57V

NO.

NO.

4

3.1V

0.1V

11

1.2V

5

0V

13

2.6V

27

0V

E

0V

12

E

0V

28

2.5V

14

5.2V

1.6V

C

0V

13

1.3V

C

3.15V

IC1901

B

2.3V

14

1.7V

B

2.1V

PIN

VOLTAGE

Q1403

15

1.3V

Q1601

NO.

PIN

VOLTAGE

16

2.2V

PIN

VOLTAGE

1

5.5V

NOTES FOR SCHEMATIC DIAGRAMS

NO.

17

2.4V

NO.

2

1.6V

E

3.18V

18

1.2V

E

5.45V

3

0V

• Resistance values unless otherwise specified are in Ω.

C

0V

19

1.1V

C

4.4V

4

2.8V

"K" means 1000Ω, and "M" means 1000kΩ.

B

3.15V

20

0V

B

4.8V

5

5.5V

• Capacitors unless otherwise specified are in µF.

"P" is an abbreviation for pF.

• Capacitors indicated as (CH), (RH), (TH), (UJ), (CK),

etc. are ceramic tempetature compensation types.

Capacitors indicated as (ML) are Mylar type.

• For electrolytic capacitors, indication is in the order of

capacity and voltage resistance.

• Parts indicated with the

mark (

mark) are

important for safety reasons. Be sure to use the designated parts for replacement in order to ensure safety and performance.

• Voltage value indicated in each part is without signal, as measured with a digital multimeter.

• The schematic and PCB diagrams are subject to change for improved performance. Thus, they may be slightly different, depending on the set.

	IC1916
PIN	VOLTAGE
NO.
1	1.58V
2	3.2V
3	1.58V
4	3.2V
5	DIG input:2.2V
	Other:0V
6	DIG input:1.58V
	Other:0V
7	1.55V
8	2.2V
9	3.2V
10	3.2V
11	97A:3.2V
	97B:1V
12	97A:3.2V
	97A:0.9V

	Q1804
PIN	VOLTAGE
NO.
E	5.4V
C	5.4V
B	4.8V

	Q1805
PIN	VOLTAGE
NO.
E	0V
C	0.7V
B	3.1V

	Q1701
PIN	VOLTAGE
NO.
E	3.2V
C	5.4V
B	3.85V

	IC1802
PIN	VOLTAGE
NO.
1	2.46V
2	0V
3	3.85V

	IC1402
PIN	VOLTAGE
NO.
1	0V
2	3.2V
3	3.2V
4	3.2V
5	0V
6	0V
7	0V
8	0V

24

WAVEFORMS

PLAY STATUS

1 TP1274 (EFMMON)

2 TP1103 (T+)

3 TP1101 (T-)

Stopped			1997 / 08 / 04 09:30:15
	NORM: 100M S/s
	T
	CH1	500mV	500ns/div					Filter
				SMOOTH OFF
	AC	10:1
				BW				FULL
								Offset
				CH1				- - -
				CH2				0.000V
				CH3				0.000V
				CH4				0.000V
T					Record Len
				Main				500
1
				Zoom				10
								Detay
				0.000 000 000s
						Hold Off
				MIN
							Trigger
				NORMAL
				EDGE
					CH1

Stopped	GROOVE PLAY
NORM: 2M S/s	1997 / 08 / 04 11:43:05
T

CH1 500mV CH2 500mV

AC 10:1

AC 10:1

T

1

2

500us/div

Filter

SMOOTH OFF

BW FULL

Offset

	CH1		- - -
	CH2		- - -
	CH3		0.000V
	CH4		0.000V
		Record Len
	Main		10K
	Zoom		100

Detay

0.000 000s

Hold Off

MIN

Trigger

NORMAL

EDGE

CH1

Stopped	PIT PLAY
NORM: 50M S/s	1997 / 08 / 04 11:56:15
T

CH1	1V	CH2	2V	20us/div
DC	10:1	DC	10:1

4 TP1138 T (ADLPFO)

1

5 TP1137

(WBO)

2

Filter SMOOTH OFF BW FULL

Offset

CH1 0.000V CH2 0.000V CH3 0.000V CH4 0.000V

Record Len

Main 10K

Zoom 100

Detay

0.000 000 0s

Hold Off

MIN

Trigger

NORMAL

EDGE

CH1

Stopped	GROOVE PLAY
NORM: 50M S/s	1997 / 08 / 04 11:55:38
T

CH1	1V	CH2	2V
DC	10:1	DC	10:1

4 TP1138

T

1

5 TP1137

2

	20us/div		Filter
		SMOOTH OFF
		BW FULL

Offset

CH1 0.000V

CH2 0.000V

CH3 0.000V

CH4 0.000V

Record Len

Main 10K

Zoom 100

Detay

0.000 000 0s

Hold Off

MIN

Trigger

NORMAL

EDGE

CH1

XR-A550MD

1 TP1274

6 TP1218 (TEMON)

7 TP1217 (TOTMON)

8 TP1212 (TCRS)

1 TP1274

6 TP1218

7 TP1217

8 TP1212

PIT PLAY

Stopped

NORM: 1M S/s

1997 / 08 / 04

13:35:24

T

CH1

2V

CH2

2V

CH3

200mV CH4

5V

1ms/div

Filter

SMOOTH

OFF

DC

10:1

DC

10:1

AC

10:1

DC

10:1

BW FULL

Offset

1

CH1

0.000V

CH2

0.000V

CH3

- - -

T

CH4

0.000V

Record Len

2

Main

10K

Zoom

100

Detay

0.000 00s

Hold Off

3

MIN

Trigger

AUTO

EDGE

4

CH2

Stopped

GROOVE PLAY

NORM: 1M S/s

1994 / 08 / 04

13:37:11

T

CH1

2V

CH2

2V

CH3

200mV

CH4

5V

1ms/div

Filter

DC

10:1

DC

10:1

AC

10:1

DC

10:1

SMOOTH OFF

BW

FULL

Offset

1

CH1

0.000V

CH2

0.000V

CH3

- - -

CH4

0.000V

T

Record Len

2

Main

10K

Zoom

100

Detay

0.000 00s

Hold Off

3

MIN

Trigger

AUTO

EDGE

4

CH2

Stopped

POWER OFF

STANDBY

NORM: 500 S/s

1997 / 08 / 04 12:58:01

T

CH1

2V

CH2

2V

CH3

2V

CH4

2V

2s/div

DC

10:1

DC

10:1

DC

10:1

DC

10:1

9

TP1216

1

T

(FEMON)

6

TP1218

2

10 SPDRR

3

11 SPDRF

4

Filter SMOOTH OFF BW FULL

Offset

CH1 0.000V CH2 0.000V CH3 0.000V CH4 0.000V

Record Len

Main 10K

Zoom 100

Detay

0.00s

Hold Off

MIN

Trigger

AUTO

EDGE

CH1

POWER ON

POWER OFF STANDBY

Stopped

	NORM: 1k S/s						1997 / 08 / 04 13:57:22
	T
	CH1	2V	CH2	2V	CH3	5V	CH4	5V	1s/div
	AC	10:1	AC	10:1	AC	10:1	DC	10:1

9 TP1216

		1
12	TP1102	T
	(F+)
		2
13 DSENSE
		3
14	FOK
		4

Filter SMOOTH OFF BW FULL

Offset

	CH1		- - -
	CH2		- - -
	CH3		- - -
	CH4		0.000V
		Record Len
	Main		10K
	Zoom		100

Detay

0.00s

Hold Off

MIN

Trigger

AUTO

EDGE

CH2

POWER ON

25

XR-A550MD

9 TP1216

6 TP1218

15TP1607

(SLD+)

16TP1606 (SLD-)

6 TP1218

15TP1607

16TP1606

17 LRCK

18 DADATA

Stopped

NORM: 1k S/s

1997 / 08 / 04

14:19:52

T

CH1

2V

CH2

2V

CH3

5V

CH4

5V

1s/div

Filter

DC

10:1

DC

10:1

DC

10:1

DC

10:1

SMOOTH

OFF

BW

FULL

Offset

CH1

0.000V

1

CH2

0.000V

18 DADATA

CH3

0.000V

CH4

0.000V

T

Record Len

Main

10K

2

Zoom

100

20

BCLK

Detay

0.00s

Hold Off

3

MIN

17

LRCK

Trigger

AUTO

EDGE

4

CH2

Stopped

NORM: 200 S/s

1997 / 08 / 04

14:44:01

T

T

CH2

1V

CH3

200mV CH4

200mV 5s/div

Filter

DC

10:1

AC

10:1

DC

10:1

SMOOTH

ON

BW

FULL

Offset

CH1

0.000V

CH2

0.000V

21

CH3

- - -

DFCK

CH4

25.000V

2

Record Len

Main

10K

Zoom

20

Detay

3

0.00s

Hold Off

20

BCLK

MIN

Trigger

AUTO

EDGE

4

CH2

Stopped	D/A CONVERSION PLAY
NORM: 100M S/s		1997 / 08 / 04 10:03:45
T

CH1	2V	CH2	2V
DC	10:1	DC	10:1

T

1

2

5us/div						Filter
		SMOOTH OFF
		BW				FULL
						Offset
		CH1				0.000V
		CH2				0.000V
		CH3				0.000V
		CH4				0.000V				22
			Record Len								DiN
		Main				5K
		Zoom				50
						Detay
		0.000 000 00s
				Hold Off
		MIN								23	DOUT
					Trigger
		NORMAL
		EDGE
			CH1

Stopped

PLAY

	NORM: 100M S/s						1997 / 08 / 04 11:23:12
	T
	CH1	5V	CH2	5V	CH3	52V	2us/div
	DC	10:1	DC	10:1	DC	10:1

T

1

2

3

Filter SMOOTH OFF BW FULL

Offset

CH1 0.000V CH2 0.000V CH3 0.000V CH4 0.000V

Record Len

Main 2K

Zoom 20

Detay

0.000 000 00s

Hold Off

MIN

Trigger

NORMAL

EDGE

CH1

Stopped					PLAY
	NORM: 100M S/s				1997 / 08 / 04 10:35:14
	T
	CH1	2V	CH2	2V	500ns/div
	DC	10:1	DC	10:1
T
1

2

			Filter
SMOOTH OFF
BW			FULL
			Offset
CH1			0.000V
CH2			0.000V
CH3			0.000V
CH4			0.000V
	Record Len
Main			500
Zoom			10
			Detay

0.000 000 000s

Hold Off

MIN

Trigger

NORMAL

EDGE

CH1

DIGITAL REC

Stopped

	NORM: 100M S/s				1997 / 08 / 04 16:59:39
	T
	CH1	2V	CH2	2V	500ns/div
	DC	10:1	DC	10:1

T

1

2

Filter SMOOTH OFF BW FULL

Offset

	CH1		0.000V
	CH2		0.000V
	CH3		0.000V
	CH4		0.000V
		Record Len
	Main		500
	Zoom		50

Detay

0.000 000 000s

Hold Off

MIN

Trigger

NORMAL

EDGE

CH1

A/D CONVERSION

while ANALOG REC (no signal) is in progress

Stopped
NORM: 100M S/s	1997 / 08 / 04 10:12:30
T

CH1 2V

DC 10:1

17 LRCK T

1

19 ADDATA

2

CH2	2V	5us/div						Filter
DC	10:1
				SMOOTH OFF
				BW				FULL
								Offset
				CH1				0.000V
				CH2				0.000V
				CH3				0.000V
				CH4				0.000V
					Record Len
				Main				5K
				Zoom				50
								Detay
				0.000 000 00s
						Hold Off
				MIN
							Trigger
				NORMAL
				EDGE
					CH1

24VOUTL VOUTR

1 kHz 0dB Sine Wave PLAY

Stopped

NORM: 5M S/s

T

CH1 500mV

DC 10:1

T

1

1997 / 08 / 04 09:47:21

200us/div

Filter SMOOTH OFF BW FULL

Offset

CH1 0.0000V CH2 0.000V CH3 0.000V CH4 0.000V

Record Len

Main 10k

Zoom 100

Detay

0.000 000 s

Hold Off

MIN

Trigger

NORMAL

EDGE

CH1

26

XR-A550MD

27

	1		2

XR-A550MD

3.5 MD MAIN ASSY

A

G

MD MAIN ASSY

(KUCXJ TYPE : XWZ3177) (DBDXJ TYPE : XWZ3186)

B

H CN4506

K 2/3

CN1054

C	CN1904

ASSY)MAINA(MD-PWB	E

D

(MD)

CN1902

28 G

3		4

RSS1042

	R4599
MTZJ5.1B	33

(MD)

(MD)

	1		2		3		4

	5		6		7

: MD or DECK PB SIGNAL ROUTE

(MD)

	: MD PB SIGNAL ROUTE
	: MD REC SIGNAL ROUTE
	(PB)
J	: DECK PB SIGNAL ROUTE

CN4001

(PB)

(MD)

(MD)

NJM4558MD

NJM4558MD

(MD)

(MD)

8

XR-A550MD

A

O CN5502

B

C

2/3	CN3002
K
2/3	CN3001
K

(PB)

D

G 29

	5		6		7		8

	1		2		3

XR-A550MD

3.6 MD FRONT, MD LED and MD SUB ASSEMBLIES

A

B

MSM9202-01

C

D

I MD LED ASSY

(KUCXJ TYPE : XWZ3180) (DBDXJ TYPE : XWZ3189)

30 H I

4

H

MD FRONT ASSY (KUCXJ TYPE : XWZ3178) (DBDXJ TYPE : XWZ3187)

MD FRONT ASSY

S4501 : MD EJECT

S4502 : DELETE

S4503 : MENU

S4504 : DISPLAY/CHARA

G CN4503

	1		2		3		4