Sony HCD-MD373 service manual Main Section, BD CD Section

HCD-MD373

– MAIN SECTION –

MUTE SW	MUTE SW
Q551	Q841
	11
	1 POWER AMP 10
	IC801

+B

RY881

+

		TUNER UNIT
	ANTENNA
		STEREO		50
				51
AM		TUNED
				54
			DO
FM 75 Ω				53
			DI
				55
FM 300 Ω			CLK
				52
			CE
				49
		MUTE
			RDS
			R-CH		R-CH
J101	L
TAPE
	B					IC302
INPUT		R-CH
	R				INPUT SELECTOR
J602				12	SELECT		13
		R-CH			SWITCH
LINE				14
						B
IN
					10	9	6

MUTE CONTROL	MUTE SW
Q552	Q801
AEP, UK
	RDS DECODER
	IC401
BUFFER	4 MUX	X1 13		X401
Q401
				4.332 MHz
		X0 14
	RDATA RCLK
	2	16
			L	J101
				TAPE
			A
				OUTPUT

						DBFB SW	DBFB DET
						Q301		D881
						PROTECT SW	OVER LOAD DET
						Q872–873	Q802, 871
								M103
								LOADING
								MOTOR
						BD (CD) SECTION		M
						(Page 41)		2	10
							IC171
							MOTOR	DRIVE
							DRIVE
								6	5
05 15 45 35 55 25 94						95 23 65 18 85 28 91 33 75
50 51 54 53 55 52 49	6	1	3	21 20	27	59 32 56 81 58 82 19 33 57	71 70 67 66
STEREO TUNED ST-DIN ST-DOUT ST-CLK ST-CE ST-MUTE	TA-MUTE	STKPOWER	F-RY	RQS-DATA RDS-INT	PROTECT-IN	CD-RESET SQ-DATA-IN SENS CD DATA CD-LAT CD CLK SCOR SQ-CLK HOLD	OPEN-SW IN-SW LOAD-IN		LOAD-OUT
						IC501
						MASTER CONTROL

R-CH

RELAY DRIVE

Q881

SIRCS

IC602

			D602–609
VOLUME
ROTARY
ENCODER				LED DRIVE
S601		S602–616		Q607–610
86 87	88 93	89	91	72	79
VOL A VOL B	SIRCS HEADPHONE	KEY 0	KEY 1 KEY 2	LED LED	STANDBY

–

–

R-CH +

R-CH

L

TM881

SPEAKER

R

J601

PHONES

BD (CD) SECTION	BASS
	26

(Page 41)	39	TU
		TC
	38	CD	SELECT
CD-L	37	MD	SWITCH
D-OUT	36
				MICON
			INTERFACE
		TAL		ATA D	KLC
		20		21	22
I2C-SCL
I2C-SDA

35

25

R-CH

IC301

DIGITAL SOUND

CONTROLLER

MUTE SW	R-CH	R
Q101
REC OUT MUTE
Q102

IC601

DISPLAY DRIVER

VF	1	DIG11	RST 13
	11	DIG1	CS 14
	.	.	SCK 15
	62	DIG14
FLUORESCENT	64	DIG12 SDATA 16
INDICATOR	24	SEG34	DIG0 12	BUFFER
TUBE
				Q601
FL601	31	SEG27
	.	.
	33	SEG26

MD-REC-L I2C-SDA I2C-SDL	REC OUT CONT	62LAT 62DATA 62CLK FUNC-SEL1 OPT-SEL	FL-RESET FL-CHIP SELECT FL-CLK FL-DATA	POWER-ON	CD-POWER	MD-RESET AC-CUT	RESET	FL-ON
94 30 29	83	38 47 48 45 46	34 36 37 35	43	5	28 22	12	42

VF

VF

XOUT	XIN	SUBXIN	SUBXOUT
13	15	10	11
	X501		X502
	16MHz	32.768kHz
			T900
			POWER
			TRANSFORMER
	VF SW
Q972, 973

VOLTAGE SELECTOR S991

AC IN

RY901

	MD-LEVEL L
	MD-REC-L
	MD-L
	DIG-IN
BD (MD)	RESET
SECTION (2/2)	P.DOWN

(Page 43)

	12	13	11	10	9
	IC121				8
OPTICAL
DIGITAL	1				6
IN	2
		3	4	5
	IC131

59 SEG0	DIG15	61	BUFFER
VF			Q602

MD-RESET

Q932

SWITCH

Q501

VP (–30V)

B.UP +3.3V

BT921

BACKUP

BATTERY

D945

SWITCH

Q974

–30V REG

Q971, D979–980

CHARGER

Q921

AC ON RESET

Q941

D987 D986

SWITCH

Q975

+5V REG

3 IC921 1

2

D921

AC OFF DETECTOR

IC941, D941–943

RECTIFIER

D975–978

RECTIFIER

D971–974

RECTIFIER

D992–993

RELAY DRIVER

Q991

DIGITAL INPUT

SELECTOR

D944S101

RESET

+B

T901

SUB

TRANSFORMER

RECTIFIER

•SIGNAL PATH

:FM

:PB (TAPE)

:REC (TAPE)

:CD

:CD (Digital out)

:PB (MD)

:REC (MD)

:PB (Digital out)

:REC (Digital in)

		ST+12V			–B
A+7.5V	3	+7V REG	1	3	+12V REG	1
		IC902			IC901
		2
		D101
DIG+5V				3	+5V REG	1
					IC913
		A+3.3V
				D912
		SYS+3.3V		D913
		MD RESET			+3.3V REG
RESET SWITCH	3		5	3		1
Q931		IC931			IC912
				D914
					2
					D911
		A+5V
CD+5V		SWITCH		3	+5V REG	1
		Q911			IC911
SWITCH		MOTOR		3	+7V REG	1
Q912		+7V			IC903

D832

RECTIFIER

D982–985

RECTIFIER

D981

4444