Daewoo DV-T1M1WX, ST-120WN, ST-160WN Service Manual

S/M No.:. : VTC1C1WET0

Service Manual

Video Cassette Player

ALL T4 - MECHA

Model:
DVST1C1WX-BG/D
DVST1C1WX-BG/E
DVST1M1WX-BB/D
DVST1M1WX-BB/E
DV-T1M1WX-BB/D	1B1W
DV-T1M1WX-BB/E
DV-T1B1WX-BB/D

1C1W

1M1W

Caution

:In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).

DAEWOO ELECTRONICS CO., LTD.

http : //svc.dwe.co.kr

Jan. 2002

TABLE OF CONTENTS
SPECIFICATION ..........................................................................................................	2
CIRCUIT DIAGRAM & WAVE FORM ............................................................................	3
INTERCONNECT WIRING DIAGRAM ....................................................................................................	3
POWER SUPPLY SCHEMATIC DIAGRAM(MIDDLE EAST) ..................................................................	4
POWER BLACK DIAGRAM .....................................................................................................................	6
SERVO & SYSCON SCHEMATIC DIAGRAM(MIDDLE EAST) ...............................................................	7
SERVO & SYSCON BLOCK DIAGRAM ..................................................................................................	9
VIDEO/AUDIO SCHEMATIC DIAGRAM ..................................................................................................	10
VIDEO PLAYBACK PATH FOR PAL .......................................................................................................	12
PIF SCHEMATIC DIAGRAM ....................................................................................................................	13
PCB CIRCUIT BOARD ..................................................................................................	15
COMPONENTS LOCATION .......................................................................................	17
ELECTRICAL PARTS LIST ...........................................................................................	18
APPENDIX (Appendix is provided only by internet http://svc.dwe.co.kr)
TROUBLESHOOTING GUIDES

1

SPECIFICATIONS

GENERAL

Power Requirement

Power Consumption

Temperature

Operating position Dimensions (W x H x D) Weight

Format Tape Width Tape Speed

Maximum Recording Time with full-size cassette

VIDEO

Signal system

Recording system

Input

Output

Signal-to-Noise ratio

Horizontal resolution

AUDIO

Recording system

Input

Output

Frequency Range

Signal to Noise Ratio

Audio Distortion

RF Output

ACCESSORIES

Provided Accessories

AC 90~250V, 50Hz , 60Hz
Max. 14W (in REC mode)
5°C ~ 35°C (Operating)
-20°C ~ 60°C (Storage)
Horizontal only
360 x 91 x 239 (mm)
Approx. 3.8 Kg
VHS standard
12.65mm		(LP) : 11.70mm/sec
PAL	(SP): 23.39mm/sec
NTSC (EP):11.12mm/sec		(SP): 33.35mm/sec
PAL	(SP): 240min, with E-240 video cassette

(LP):480min, with E-240 video cassette. NTSC(SP):120min, with T-120 video cassette.

(EP):360min, with T-120 video cassette.

PAL/MESECAM/NTSC color signal

Rotary two-head helical scan with a slant double-azimuth combination videohead 1.0Vp-p, 75ohms, unbalanced

1.0Vp-p, 75ohms, unbalanced More than 43dB (SP)

240 lines

Longitudinal track

-8dBm(more than 47 k-ohms)unbalanced -5.8dBm, (more than 1 k-ohms load),unbalaned 100Hz-10KHz(NTSC SP), 100Hz-8KHz(PAL-SP) More than 40dB (PAL-SP)

Normal : Less than 4% (SP), HIFI : Less than 0.7%

21 ~ 40 CH(Adjustable)

Remote control unit, RF Cable, Battery

* Design and specification can be subjected to change without notice.

*INPUT/OUTPUT JACK TYPE
SCART JACK			DVST1C1WX-BG/E,DVST1M1WX-BB/E,DV-T1M1WX-BB/E
RCA JACK(PHONE JACK)			DVST1C1WX-BG/D,DVST1M1WX-BB/D,DV-T1M1WX-BB/D,DV-T1B1WX-BB/D

<SCART JACK>	<RCA JACK(phone jack)>

2

INTERCONNECT WIRING DIAGRAM

3

POWER SUPPLY SCHEMATIC CIRCUIT DIAGRAM(MIDDLE EAST)

4

LOC.		PIN	EE	PLAY	REC.
IC801		1	5.5	5.5	5.5
		2	4.4	4.4	4.4
		3	0.8	0.8	0.8
		4	5.6	5.6	5.6
LOC.		PIN	EE	PLAY	REC.
IC802		1	2.5	2.5	2.5
		2	0	0	0
		3	4.4	4.4	4.4

POWER			MODE
LOC.	PIN	EE		PLAY	REC.
Q801	G	290		290	290
	D	200		200	200
	S	250		250	260
Q802	G	0		0	0
	D	250		250	260
	S	0		0	0
Q803	E	0		0	0
	B	0		0	0
	C	1		1	1
Q804	E	0		0	0
	B	0.4		0.4	0.4
	C	1		1	1
Q805	E	12.6		12.6	12.6
	B	13.2		13.2	13.2
	C	14.7		14.3	15
Q806	E	0		0	0
	B	0.3		0.3	0.3
	C	13.2		13.2	13.2
Q807	E	5.3		5.3	5.3
	B	6		6	6
	C	5.8		5.8	5.8

! Q801 “D”	X : 20V DIV	@ Q801 “G”	X : 100V DIV	# T801 PIN 2	X : 5V DIV
	Y : 5uS DIV		Y : 5uS DIV		Y : 5uS DIV

$ T801 PIN 4	X : 100V DIV	% T801 PIN 6	X : 1V DIV	^ IC801 PIN3	X : 0.1V DIV
	Y : 5uS DIV		Y : 2mS DIV		Y : 5uS DIV

$ IC801 PIN 4 X : 2V DIV Y : 5uS DIV

5

POWER BLOCK DIAGRAM

6

SERVO & SYSCON SCHEMATIC DIAGRAM(MIDDLE EAST)

7

SYSCON				MODE
LOC.		PIN	EE	PLAY	REC.
IC601		1	5.1	5.1	5.1
		2	0	0	0
		3	0.2	0.2	0.4
		4	2.1	2.1	2.1
		5	0	0	0
		6	5.1	5	5.1
		7	0	0	0
		8	0.1	0.1	0.4
		9	0.1	0.1	0.4
		10	1.8	2.6	1.4
		11	1.1	1.1	1.1
		12	0.6	0.6	0.6
		13	0	0	0
		14	5.2	5.2	5.2
		15	5	2.5	2.5
		16	5	5	5
		17	0	0.1	0.3
		18	2.5	2.5	2.5
		19	2.5	2.5	2.5
		20	0.6	0.6	0.6
		21	0.6	0.6	0.6
		22	0.6	0.6	0.6
		23	0.6	0.6	0.6
		24	0.6	0.6	0.6
		25	0.6	0.6	0.6
		26	0.6	0.6	0.6
		27	0.6	0.6	0.6
		28	5	5	5
		29	5	5	5
		30	5	0.5	5
		31	5	5	0.6
		32	0.6	0.6	0.6
		33	0	0	0
		34	5	5	5
		35	0.2	0.2	0.3
		36	0.2	0.2	0.2
		37	5	5	5
		38	2	2	2
		39	2.3	2.3	2.3
		40	0	0	0
		41	2.3	2.3	2.3
		42	2.3	2.3	2.3
		43	5	5	5
		44	2.8	2.8	2.8
		45	2.8	2.8	2.8
		46	0	0	0
		47	1.8	1.8	1.8
		48	0	0	0
		49	0	0	0
		50	1.9	1.9	1.9
		51	2.8	2.8	2.8
		52	1.9	1.9	1.9
		53	5.2	5.2	5.2
		54	2.1	2.1	2.1
		55	0	0	0
		56	1	1	0
		57	0	0	0
		58	0.3	0.3	0.3
		59	5	5	0
		60	4.9	4.9	4.9
		61	4.9	0	0

SYSCON							MODE
LOC.					PIN	EE	PLAY	REC.
IC601					62	0	4.9	4.9
					63	0	0	0
					64	0	0	4.9
					65	0	4.9	4.9
					66	4.9	0	0
					67	0	0	0
					68	1.5	1.5	1.5
					69	0	0	0
					70	0	0	0
					71	4.2	4.5	4.5
					72	4.3	4.5	4.5
					73	2.2	2.2	0.2
					74	0	4.9	0
					75	0.3	0.3	0.3
					76	0	2.5	2.5
					77	0	2.7	2.7
					78	0	0	0
					79	0	0°Í5	0°Í5
					80	0	0°Í5	0°Í5
					81	0	0	0
					82	0	0	0
					83	0	0	0
					84	4.9	0	0
					85	0	0	0
					86	2.4	0.2	0.2
					87	1.2	2.5	2.5
					88	0	0	0
					89	4.5	2	2.1
					90	0.2	0.3	0.3
					91	2.5	2.5	2.5
					92	2.5	2.5	2.5
					93	2.4	0	0
					94	2.5	2.5	2.2
					95	2.5	2.5	2.7
					96	2.5	2.5	2.5
					97	2.5	2.5	2.5
					98	5.1	5.1	5
					99	5.1	5.1	5
					100	0	0	0
SYSCON							MODE
LOC.					PIN	EE	PLAY	REC.
IC603					1	0	0	0
					2	0	0	0
					3	0	0	0
					4	0	0	0
					5	4.3	4.5	4.5
					6	4.3	4.5	4.5
					7	0	0	0
					8	5	5	5
SYSCON							MODE
LOC.					PIN	EE	PLAY	REC.
IC604					1	0	0	0
					2	0.4	0.4	0.3
					3	0.8	0.8	0.8
					4	7.3	7.3	7.3
					5	0	0	0
					6	0	0	0
					7	13.2	12.7	13.5
					8	13.2	12.7	13.5
					9	0.8	0.8	0.8
					10	0.4	0.4	0.3

! IC601 PIN97	X : 1V DIV	@ IC601 PIN89	X : 1V DIV	# IC601 PIN87	X : 1V DIV
CTL AMP OUT	Y : 5uS DIV	DRUM FG	Y : 0.5mS DIV	CAPSTAN FG	Y : 0.5mSDIV

$ IC601 PIN76 X : 1V DIV	% IC601 PIN71	X : 1V DIV	^ IC601 PIN72 X : 1V DIV
CAPSTAN PWM Y : 5uS DIV	SERIAL CLK	Y : 0.1mS DIV	SERIAL DATA Y : 0.1mS DIV

8

SERVO & SYSCON BLOCK DIAGRAM

9

VIDEO/AUDIO SCHEMATIC DIAGRAM

10

A/V				MODE			A/V				MODE			A/V		MODE
LOC.		PIN	EE	PLAY	REC.		LOC.		PIN	EE	PLAY	REC.		LOC.	PIN	EE	PLAY	REC.
IC301		1	2.6	2.6	2.5		IC301		51	1.9	1.9	1.9		Q201	E	5.8	5.8	5.8
		2	2.6	2.6	2.5				52	2.7	2.7	2.7			B	5.8	5.8	4.9
		3	2.6	2.6	2.6				53	0	0	0			C	0.3	0.3	5.1
		4	2.6	2.6	2.5				54	2.7	2.7	2.7		Q202	E	0	0	0.2
															B	0.2	0.2	-2.5
		5	0	0	1.8				55	5.2	5.2	5.2
									56	0.5	0.5	0.5			C	0.3	0.2	5
		6	2.6	2.6	2.5
		7	2.6	2.6	2.5				57	3.4	3.4	3.4		Q203	E	0	0	-31.4
		8	0	0	0				58	5.2	5.2	5.2			B	0.7	0.7	-37
		9	0	0	0				59	3.3	3.3	3.3			C	0	0	0.2
		10	0.7	0.7	0.7				60	3.4	3.4	3.4		Q204	E	0	0	-31.4
		11	4.1	4.1	4.1				61	3.4	3.4	3.4			B	0.7	0.7	-37
		12	2.8	5.2	2.8				62	3.4	3.4	3.4			C	0	0	0
		13	1.4	1.4	1.4									Q205	E	5.3	5.3	5.3
									63	4	4	4
		14	1.7	1.7	1.7				64	2.8	2.8	2.8			B	4.6	4.6	5.1
		15	2.3	2.3	2.3				65	2.1	2.1	2.1			C	5.2	5.2	-37.1
		16	5.2	5.2	5.2				66	2.9	2.9	2.9		Q211	E	0.1	0.1	4.2
		17	0.2	3	0.2				67	4.1	4.1	4.1			B	0.2	0.2	4.9
		18	2.5	2	2.5				68	0	0	0			C	5.8	5.8	4.9
									69	1	1	1		Q301	E	1.8	1.4	1.8
		19	2.5	1.2	2.5
		20	3.1	3	3.1				70	2.1	2.1	2.1			B	2.4	2	2.4
		21	2.5	2.2	2.5				71	2.5	2.5	2.5			C	3.4	3.9	3.4
		22	0	0	0				72	3.3	3.4	3.3		Q302	E	1.9	1.6	1.9
		23	4.3	4.5	4.5				73	2.5	2.5	2.5			B	2.5	2.2	2.5
		24	4.3	4.5	4.5				74	1.9	1.9	0			C	5.2	5.2	5.2
														Q303	E	2.1	2.1	2.1
		25	1.7	1.7	1.7				75	5.2	5.2	5.2
															B	1.5	1.5	1.5
		26	0	0	0				76	2.5	2.5	2.5
		27	0.4	0.4	0.4				77	1	0	1			C	0	0	0
														Q305	E	0	0	0
		28	0.3	0.3	0.3				78	2.5	2.5	2.5
		29	1.8	1.8	1.8				79	2.6	2.6	2.6			B	0	0	0
		30	1	1	4.3				80	2.5	2.5	2.5			C	1.8	1.4	1.8
		31	2.9	2.9	2.9				81	0	0	0			E	2.5	2.5	2.5
		32	2.3	2.3	2.3				82	2.2	2.2	4.4			B	1.8	1.8	1.8
		33	1.4	1.5	1.4										C	0	0	0
									83	0	0	0
		34	1.9	1.9	1.9
									84	2.2	2.2	4.4
		35	3.4	3.4	3.4
									85	2.2	2.2	4.4
		36	1.9	1.9	1.9				86	0	0	0
		37	5	5	5				87	5.2	5.2	5.2
		38	2.3	2.3	2.3				88	0	0	0
		39	4.1	4.1	4.1				89	0	0	0
		40	5.2	5.2	5.2				90	0	0	0
		41	2.9	2.9	2.9				91	0	0	0
		42	3	3	3				92	0.3	0.3	1.6
		43	2	2	2				93	1.2	2.6	1
		44	0	0	0				94	0	0	1.2
		45	2.3	2.3	2.3
									95	0	0	0
		46	1.5	1.5	1.5
									96	2.5	0	2.5
		47	9.8	9.8	9.8
									97	0	0	0
		48	2.3	2.3	2.3				98	2.5	2.5	2.5
		49	0.9	0.9	0.9
									99	0.1	0.1	4.2
		50	0	0	0				100	2.5	2.5	3.9

& IC301 PIN32	X : 0.2V DIV	* IC301 PIN38	X : 0.2V DIV	( IC301 PIN51	X : 0.1V DIV
REC SECAM	Y : 20uS DIV	VIDEO INPUT(REC)Y : 20uS DIV		COMB OUT(REC) Y : 20uS DIV

) IC301 PIN51	X : 0.1V DIV	1 IC301 PIN74	X : 0.1V DIV	2 IC301 PIN41	X : 0.1V DIV
COMB OUT (PB) Y : 20uS DIV		PB ENVE	Y : 20uS DIV	Y-DLY OUT (PB) Y : 20uS DIV

			3 IC301 PIN41	X : 0.1V DIV	4 IC301 PIN18	X : 0.1V DIV	5 IC301 PIN21	X : 0.1V DIV
			Y-DLY OUT(REC) Y : 2uS DIV		PB Y-FM	Y : 20uS DIV	DEEMPHA OUT(PB) Y : 20uS DIV

! IC301 PIN12	X : 0.1V DIV	@ IC301 PIN72	X : 0.1V DIV	# IC301 PIN72	X : 0.1V DIV
REC Y-FM	Y : 10uS DIV	PB COLOR(PAL) Y : 20uS DIV		PB COLOR(SCM) Y : 20uS DIV

				6IC301 PIN29	X : 0.5V DIV	7 IC301 PIN76	X : 0.1V DIV	8 IC301 PIN96	X : 0.5V DIV
				VIDEO OUT(REC) Y : 20uS DIV		AUDIO IN	Y: 0.5mS DIV	AUDIO OUT	Y : 0.5mS DIV

$ IC301 PIN72	X : 0.1V DIV	% IC301 PIN28	X : 0.1V DIV	^ IC301 PIN72	X : 0.1V DIV
REC COLOR(SCM) Y : 20uS DIV		C.SYNC	Y : 20uS DIV	PB COLOR(SCM) Y : 20uS DIV

11

VIDEO PLAYBACK PATH FOR PAL

VIDEO RECORD PATH FOR PAL

12

PIF SCHEMATIC DIAGRAM

13

	PIF			MODE
LOC.		PIN	EE	PLAY	REC.
Q101		E	2.6	2.6	2.6
		B	1.9	1.9	1.9
		C	0	0	0
Q102		E	12.5	12.5	12.5
		B	12.5	11.7	12.5
		C	0	12.5	0
Q103		E	0	0	0
		B	0	4.9	0
		C	12.5	8.9	12.5

14