Daewoo DV-F803M Schematic

SPECIFICATIONS

SYSTEM

Video signal	NTSC/M-PAL
Channel coverage	VHF Channel 2-13
	UHF Channel 14-69
	CATV Channels A1-A5, A8, A-W, W+1, W+1-W+84
VHF output signal	Channel 3 or 4 (selectable)

VIDEO

Input: Video line in	Phono-type connector 1.0V (p-p)
	75 ohms unbalanced, sync. negative
Output: Video line out	Phono-type connector 1.0V (p-p)
	75 ohms unbalanced, sync. negative
Signal to noise ratio	More than 43dB (SP)
Horizontal resolution	220 lines

AUDIO

Input: Audio line in	Phono-type connector 47K ohms
	–8 dBm, unbalanced
Output: Audio line out	Phono-type connector less than 1K ohms
	–6 dBm (More than 47K ohms load), unbalanced
	Normal	Hi-Fi
Frequency response	100Hz-10KHz (SP)	20Hz-20KHz (SP)
Signal to noise ratio	More than 40dB	More than 60dB
Audio Distortion	Less than 3% (SP)	Less than 0.5% (SP)
Dynamic Range		More than 80dB

TAPE TRANSPORT

Tape width	12.65mm (1/2")
Tape speed	NTSC SP: 33.35 mm/sec, EP: 11.12 mm/sec.
Maximum recording time	480 min, with T-160 tape (NTSC EP)
FF. REW time	Approx 5 min (T-120)

GENERAL

Power requirements	110-240V, 50/60Hz
Power consumption	19W (Hi-Fi)
	16W (Normal)

DIMENSIONS

Set size (WxHxD)	360x90x312 mm
Carton size (WxHxD)	429x160x395 mm
Weight (gross)	5.4Kg (11.9 lbs)

• Safety Check after Servicing

Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned to original positions. Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety standards.

1.Insulation resistance test

Confirm the specified insulation resistance or greater between power cord plug prongs and externally exposed parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.). See table below.

2.Dielectric strength test

Confirm specified dielectric strength or greater between power cord plug prongs and exposed accessible parts of the set (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.) See table below.

3.Clearance distance

When replacing primary circuit components, confirm specified clearance distance (d), (d') between soldered terminals, and between terminals and surrounding metalic parts. See table below.

d

Primary circuit termimals

d'

Chassis

a

Table 1: Rating for selected areas				Fig. 1
	AC Line Voltage	Region	Insulation	Dielectric	Clearance
			Resistance	Strength	Distance (d), (d')
	100V	Japan	≥ 1 MΩ /500 V DC	1kV AC 1 minute	≥ 3 mm
	110 to 130V	USA &	– – –	900V AC 1 minute	≥ 3.2mm
		Canada
	* 110 to 130 V	Europe	≥ 4 MΩ /500 V DC	3 kV AC 1 minute	≥ 6 mm (d)
	200 to 240 V	Australia			≥ 8 mm (d')
					(a: Power cord)

* Class II model only.

Note: This table is unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.

4.Leakage current test

Confirm specified or lower leakage current between B (earth ground, power cord plug prongs) and externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.)

	Measuring Method: (Power ON)						Exposed
							accessible
	Insert load Z between B (earth ground, power cord plug								AC Voltmter
							part	Z
	prongs) and exposed accesible parts. Use and AC								(high impedance)
	voltmeter to measure across both terminals of load Z.							Earth Ground
	See figure 2 and following table.
								B power cord plug prongs
	Table 2: Leakage current ratings for selected areas							Fig. 2
	AC Line Voltage		Region		Load Z		Leakage Current (i)		Earth Ground
									(B) to:
	100V		Japan				¡ ≤ 1m A rms		Exposed accessible
					1k				parts
	110 to 130 V		USA &		1.5kµF		¡ ≤ 0.5 m A rms		Exposed accessible
					1.5k				parts
							¡ ≤ 0.7 m A peak		Antenna earth
	110 to 130 V		Europe		2k			¡ ≤ 2 m A dc	terminals
	200 to 240 V		Australia				¡ ≤ 0.7 m A peak		Other terminals
					50k			¡ ≤ 2 m A dc

Note: This table is unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.

TABLE OF CONTENTS

SECTION 1. CONTROLS AND FUNCTIONS......................................................................................................	2~4
SECTION 2. ELECTRICAL ADJUSTMENTS
2-1. SERVO CIRCUIT ADJUSTMENT METHOD .....................................................................................................................	5
2-2. AUDIO CIRCUIT ADJUSTMENT METHOD..................................................................................................................	6~8
2-3. PIF CIRCUIT ADJUSTMENT METHOD ............................................................................................................................	9
SECTION 3. TROUBLE SHOOTING FLOW CHART
3-1. POWER CIRCUIT ......................................................................................................................................................	10~11
3-2. LOGIC CIRCUIT.........................................................................................................................................................	12~14
3-3. SERVO-SYSCON CIRCUIT ......................................................................................................................................	15~19
3-4. AUDIO CIRCUIRT......................................................................................................................................................	20~25
3-5. VIDEO CIRCUIT.........................................................................................................................................................	26~31
SECTION 4. BLOCK DIAGRAM............................................................................................................................	32~33
SECTION 5. CIRCUIT DIAGRAM
5-1. CONNECTION DIAGRAM.........................................................................................................................................	34~37
5-2. POWER CIRCUIT (SMPS).........................................................................................................................................	38~39
5-3. SYSCON CIRCUIT...........................................................................................................................................................	40
5-4. LOGIC CIRCUIT.........................................................................................................................................................	41~44
5-5. PIF & NTS & D/V INPUT SELECTOR CIRCUIT........................................................................................................	45~46
5-6. AUTO-DETECT CIRCUIT.................................................................................................................................................	47
5-7. VIDEO CIRCUIT ...............................................................................................................................................................	48
5-8. AUDIO CIRCUIT...............................................................................................................................................................	49
5-9. PRE AMP CIRCUIT..........................................................................................................................................................	50
5-10. OSD CIRCUIT ................................................................................................................................................................	51
5-11. WAVE FORM ...........................................................................................................................................................	52~55
SECTION 6. VOLTAGE CHART
6-1. IC VOLTAGE ..............................................................................................................................................................	56~64
6-2. TR VOLTAGE .............................................................................................................................................................	65~66
SECTION 7. COMPONENTS LOCATION GUIDE ON PCB (BOTTOM VIEW)
7-1. PCB HEAD-AMP..............................................................................................................................................................	67
7-2. PCB SHUTTLE.................................................................................................................................................................	68
7-3. PCB MAIN ........................................................................................................................................................................	69
7-4. PCB LOGIC................................................................................................................................................................	70~71
7-5. PCB AUTO DETECT........................................................................................................................................................	72
SECTION 8. DISASSEMBLY
8-1. PACKING AS .............................................................................................................................................................	73~76
8-2. SET TOTAL ASSEMBLY ...........................................................................................................................................	77~80
8-3. FRONT PANEL ASSEMBLY .....................................................................................................................................	81~84
8-4. SHUTTLE STATION ASSEMBLY....................................................................................................................................	86
SECTION 9. ELECTRICAL PARTS LIST
9-1. STANDARD PART NUMBER CODING ..........................................................................................................................	88
9-2. ELECTRICAL PARTS LIST......................................................................................................................................	89~110

1

SECTION 1. CONTROLS AND FUNCTIONS

FRONT

DV-F803, 503 SERIES

POWER	EJECT	REW	FF
		PAUSE	STOP
		/STILL
OPEN			PLAY
		REC
		CH.
DV-F803
POWER	EJECT	REW	FF
		PAUSE	STOP
		/STILL

SYSTEM CONVERTION		TAPE	PLAY
NTSC	PAL NTSC
			PAL
			REC
VIDEO IN	L AUDIO	R	CH.

DV-F503
	POWER	EJECT	REW	FF
			PAUSE	STOP
			/STILL
	VTR SYSTEM	TAPE		PLAY
NTSC	PAL NTSC		PAL
		AUTO	REC
			CH.
	VIDEO	AUDIO
			2

DV-F883, 683 SERIES
					EW		F
					R		F
	POWER	EJECT
					PAUSE		STOP
					STILL
OPEN			+			PLAY
			–	CHANNEL
					REC
DV-F883
						W	F
					E
					R		F
POWER		EJECT
						PAUSE	STOP
						STILL
	SYSTEM		TAPE	+		PLAY
NTSC	PAL	NTSC	PAL
				CHANNEL
	VIDEO	AUDIO		–	REC
		L	R
DV-F683
						W	F
					E
					R		F
POWER		EJECT
						PAUSE	STOP
						STILL
SYSTEM			TAPE	+		PLAY
NTSC	PAL	NTSC	PAL
				CHANNEL
	VIDEO	AUDIO		–	REC
			3

REAR

DV-F883, 803 SERIES

			ANT.IN
VIDEO	AUDIO
	L	R
		OUT	RF OUT
		IN
		CH.3	CH.4
DV-F683, 503 SERIES

		ANT.IN
VIDEO	AUDIO
	OUT	RF OUT
	IN
	CH.3	CH.4

4

SECTION 2. ELECTRICAL ADJUSTMENTS

2-1. SERVO CIRCUIT ADJUSTMENT METHOD

1. PB Phase

Mode	Adjustment Parts	Check Point	Test Equipments	Test Tape	Input Signal
		CH 1: PT01 #		DN-1
PLAY	!R595	CH 2: VIDEO	Oscilloscope
				(Color Bar)
		OUTPUT JACK

	Location of Adjustment Parts			Observation Waveform
				H-Axis: 50us/div	V-Axis: CH 1 ¡ 1.0v/div
MAIN PCB					CH2 ¡ 0.5v/div
	T	2	1
	U	HEAD-AMP / AUDIO
	N
3
	E
	R
		DECK

• Adjustment Procedure

1. Set the oscilloscope to the CHOP mode. Connect the oscilloscope to check point and trigger the scope with CH1. 2. Adjust R595 to position the V-SYNC at 6.5±0.5H from the rising edge of sw pulse.

• Adjustment Inspecition Standard:

6.5±0.5H

5

2-2. AUDIO CIRCUIT ADJUSTMENT METHOD

1. Audio REC Bias

Mode	Adjustment Parts		Check Point	Test Equipments	Test Tape		Input Signal
			+: TP1
REC	@R292		–: TP2	Audio level meter	Blank tape		Without signal
			(A/C HEAD PCB)
			Location of Adjustment Parts

MAIN PCB

T	2		1
U
N
E		HEAD-AMP / AUDIO
R

DECK

• Adjustment Procedure

1.Set the TV/LINE to LINE mode

2.Connect the Audio level meter to both TP1 and TP2.

3.After inserting a blank tape, record in SP mode.

4.Adjust R292 to obtain 3.0±0.1mVrms.

•Adjustment Inspecition Standard:

In confirmation of Recording playback frequency characteristics, compared with 1KHz Recording-playback output level, 10KHz Recording-playback output level is higher than the standard, increase the record bias and if lower, decrease it.

6

2. Audio Playback Frequency Characteristics

Mode	Adjustment Parts	Check Point	Test Equipments	Test Tape	Input Signal
PLAY	Check NTSC	Audio Output	Audio level meter	DN-1
				DN-2

• Adjustment Procedure

1. Play back the test tape. Confirm the output level of 7 KHz is in the range of –1±3dB, compared with the output level of 1 KHz.

3. EE LEVEL

	Mode	Adjustment Parts	Check Point	Test Equipments	Test Tape	Input Signal
	PLAY	Check NTSC	Audio Output	Audio level meter	Blank tape	1KHz -8dBm
	REC			Distortion meter

• Adjustment Procedure

1.Set the TV/LINE to LINE mode.

2.Connect the Audio signal generator to the AUDIO INPUT JACK.

3.Confirm the Audio output level –6±1.5dBm when you supply 1KHz (–8dBm) to the AUDIO INPUT JACK.

4.Insert a blank tape.

Record and play back the signal of 1KHz (–8dBm) (SP/EP MODE).

5.Confirm the Audio output level and Distortion meet the followings.

1)Audio playback output level SP: –6±3dBm

EP: SP±3dBm

2)Audio distortion SP: 3% maximum

4. Confirmation of Recording Playback Frequency Characteristics

	Mode	Adjustment Parts	Check Point	Test Equipments	Test Tape	Input Signal
	REC	Check NTSC	Audio Output	Audio level	Blank tape	-20 dBm
	PLAY			meter

• Adjustment Procedure

1.Set the TV/LINE to LINE mode.

2.Connect the Audio signal generator to the AUDIO INPUT JACK and Audio level meter to the AUDIO OUTPUT JACK.

3.Insert a blank tape.

Record the signal of 400 Hz and 10 KHz and 10 KHz in SP mode.

4.The output level of 10 KHz should be within –1±3dB to the output level of 400 Hz in the PLAYBACK mode (SP).

5.Insert a blank tape.

Record the signal of 400 Hz and 5 KHz (–20dBm) in EP mode.

6.The output level of 5 KHz should be within –1±3dB to the output level of 400 Hz in the PLAYBACK mode (EP).

7

5. Hi-Fi Carrier (DV-F803M/883M)

	Mode	Adjustment Parts	Check Point	Test Equipments	Test Tape	Input Signal
	REC	R991	TP902	Frequency counter	Blank Tape	No Signal
		R993	TP901

Location of Adjustment Parts	Observation Waveform
Horizontal Axis:		S/DIV
Vertical Axis	:	V/DIV

Hi-Fi/PRE AMP PCB (COMPONENTS SIDE)

(1.3M) (1.7M)

R991 R993

TP902 TP901

• Adjustment Procedure

1.Preparation

1)Set the TV/LINE to LINE Mode.

2)Supply the input signal in the OPEN state.

2.Adjustment

1)Set the VCR to the REC Mode (SP).

2)Connect the frequency counter to TP902 (1.3MHz) and TP901 (1.7MHz).

3)Adjust R991 to set the frequency of TP902 for 1.3±0.01MHz.

4)Adjust R993 to set the frequency of TP901 for 1.7±0.01MHz.

3.Adjustment Inspection Standard:

1.3±0.01 MHz (TP902)

1.7±0.01 MHz (TP901)

8

2-3. PIF CIRCUIT ADJUSTMENT METHOD

1. STEREO (DV-F803M/883M)

Mode	Adjustment Parts	Check Point	Test Equipments	Test Tape	Input Signal
EE	#R191	Audio	AC Volt meter		US 5CH
MODE		Output-R

	Location of Adjustment Parts				Observation Waveform
MAIN PCB
	T	2	1
	U	HEAD-AMP AND HiFi

3N E R

DECK

• Adjustment Procedure

1.Connect the output of US 5CH (L=1KHz 100% MOD, R=nonsignal) to ANT IN OF TMI. Then RF signal input is 93dBu.

2.Connect audio output L and R to AC volt meter 1CH and 2 CH.

3.Turn R191, confirm if L output changes. Fix the minimum point of R output.

* The condition of US 5CH: Color Bar: 87.5% modulation, 72dBuV

Audio: L CH=1KHz, 100% MOD, R CH=nonsignal Using equipment: Audio Signal Generator, MPX equipment, RF Modulator

• Adjustment Inspecition Standard: The minimum point of R output.

9

SECTION 3. TROUBLE SHOOTING FLOW CHART

3-1. POWER CIRCUIT

•When change the parts which are out of order, first, remove the power plug from the socket and then discharge the voltage across between both terminals of C807. (Use an external scores of KΩ resistance)

•When check the primary circuit by using the oscilloscopes insulate the oscilloscope surely. (Use the isulating transformer) and must connect GND into the primary GND (But there is no connection when check the secondary circuit).

•When change IC801, check FUSE and Cement resistance surely.

A. CHECKING THE PRIMARY CIRCUIT.

NO output Voltage.
YES
Prepare the instrument
connecting the insulating trans.
YES
Check F801 FUSE.
YES
Is voltage applied to D801?	NO
	Check D801, L801 & L802.

YES

Is voltage applied to the both terminals of C807?

YES

Check voltage of Q801 Gate.

YES

Is voltage output from pin 4 of IC801?

YES

Check Q801.

NO	Check R802.

NO	Check R803, 805, 823
	814, 806 & C817.

NO	Check Q802, 803,
	D802, R809.
	Check IC801.		NO	Change IC801.

YES

Check the Secondary circuit.

10

B. CHECKING THE SECONDARY CIRCUIT.

IS DZ805, DZ807 Short?

NO

Check each votage.

YES

Check Trans output of No output stage.

YES

Check the DIODE of

NO output stage.

YES

Check COIL, C of

No output stage.

YES

Check the environmental terminals of IC801.

YES	Change DZ805, DZ807 and check
	IC801 and primary circuit.

11

3-2. LOGIC CIRCUIT

A.

Digitron does

not operate & is not good.

Is+5V supplied to pin 8 of IC701?

YES

Is-28V supplied to pin 11 of IC701?

YES

Are -25.8 and -21.2V supplied to pin 1 and 46 of G701?

YES

Are CLK signals supplied to pin 40

of IC701?

YES

Is 5V at pin 7 of

IC701?

YES

Check X701.

YES

Check IC701

and change.

NO	CHECK D815and Primary
	power circuit.

YES

Check the connector and pattern.

NO	Check the	YES	Check D814 and
	DZ601.		primary power circuit.

NO

Change DZ601.

NO	Check the Trans output
	and DZ601.

NO

Check IC601.

NO

Change IC702.

NO

Change X701.

12

B.

Digitron is lit but key do

not operate.

	Is each key pulse	NO
			Check key matrix
	applied to pin 2 , 3
			circuit.
	12 and 13 of IC701?
	YES

Check the pin serial of pin 38 , 39 of IC701.

C.

It has not power-failure compensation operation.

	When disconnecting
	the power cord,is 5.4V	NO	Check C605.
	at pin 26 and 81
	of IC601?
	YES
	Do pin 42 and	NO
			Check X602
	43 of IC601
			environmental circuit.
	oscillate?
	YES
	Is +5V applied to	NO
			Check the IC606
	pin 37 of IC601?		RESET circuit.

YES

Check IC601.

13

D.

When change the channel broadcast signal is not received.

YES

Is the external ANT. connected to RF IN of VCR and RF OUT

of TV?

YES

Is the Power of VCR ON and the VCR indicator lit on the digitron?

YES

Does the TV channel correspond to VCR (3 or 4) channel?

YES

Is the output of pin 100 , 98 of IC601 normal?

YES

Check the Video, Audio outputsignal of pin 14 , 18 of

TMI BLOCK.

NO

Check the TMI

BLOCK.

NO

NO

NO

NO

YES

Change and check the connection of CABLE

Power On and select the VCR mode by pressing the TV/VCR key.

Set the TV channel to

VCR (3 or 4) channel.

Check IC601

Is the signal applied	NO	Check the
to pin 14 of IC151?		IC601 4 4 pin.
YES
Check the
Video circuit.

14

3-3. SERVO SYSCON CIRCUIT

A.

Playback picture is not good.

Noise appears	NO
		Adjust
although adjusting		tracking.
tracking.
YES
Noise shakes up	NO	Noise appears		YES	Check and
and down on the		although change			re-adjust the
screen.		cassette tape.			Path of Deck.
YES
Is CTL pulse applied	NO	CTL HEAD height is		NO	Adjust the HEAD
to pin 73 of IC601?		normal and there is			height and remove
		not dust.			dust.

	YES
Is CTL pulse input			NO
	to pin 71 and 72 of
	IC601?
	YES
The voltage of pin			NO
	91 of IC601 is not
	changed.
	YES
	Check IC601.

YES	Check circuit
	adjacent to IC601.

Check R523, R524

C508, C509.

check R518 and C511.

15

B.

Playback picture is not good.

Noise appears on the screen whole.

YES

Are SW pulse and

HA SW applied to

HEAD-AMP circuit?

YES

Is Enve.waveform supplied to at pin 4 of PT01?

YES

Check VIDEO circuit.

C.

Auto stop during playback.

NO	Check Flow A.

NO	Is SW pulse supplied		NO	Check D.PG input
	from pin 18 of IC601?			and connector.
	YES
NO
	Check pattern.

	Check connector, Head	NO
			Change Head.
	Amp and Head dust.

Is Reel pulse	NO
		Check REEL
applied to pin 5 and
		sensor part.
6 of IC601?
YES
			NO
		Is D.FG applied to		Check connector
		pin 67 of IC601?		and D.FG circuit.

YES

Check IC601.

16

D.

Drum M/T loading stops.

NO

Is Motor 12V supplied?

YES
	NO
Is pin 67 D.FG of
IC601 supplied?
YES
	NO
Is pin D.PWM (pin 4 )
of IC601 supplied?
YES
Check connector
and Motor.

E.

Capstan M/T loading stops.

NO

Is Motor 12V supplied?

YES

	Is the input of pin 1	NO
	of P501 2V-3.5V?
	YES
		NO
	Is pin 18 of P601 2.5V?
	YES
		NO
	Is pin 3 (C.PWM)
	of IC601 Supplied?
	YES
	Check connector
	and Motor.

Check power circuit.

Check C505, R506, R507

and C516.

Check IC601.

Check power circuit.

Check circuit of R510, R511, R512.

Check R508, R509.

Check IC601.

17

F.

Drum M/T and Capstan M/T rotate at regular speed (In REC mode).

NO
	NO
Is C. Sync applied to		Check C. Sync of
pin 93 of IC601?		VIDEO IC and Pattern.

YES

Check Motor.

G.

Emergency mode when connecting the Power cord.

Is EVER 5V supplied?	NO
YES

NO

Does X601 crystal oscillate?

YES

	Do S/DATA, CLK and RDY	NO
	Signals of IC601 exchange
	with IC701?
	YES
		NO
	Is CAM SW DATA Correct?
	YES
	Check IC602.
	YES

Check power circuit.

Check IC601 and X601.

Check IC701 when CS Signal is supplied.

Check IC601 when CS Signal is not supplied.

Recheck connector and CAM SW contact.

Check IC 601.

18

H.

Cassette is not inserted.

Is Motor 12V supplied?

YES

Is there the changes CAM DATA when CST IN?

YES

Is 7.5V applied to pin 4 of IC602 when CST IN?

YES

Chek IC602.

NO

Check power circuit.

NO	Check connector.	NO	Check DECK part.

NO	Is 5V supplied at		NO	Check PATTERN.
	pin 47	of IC601?

YES

Check IC601.

19

3-4-1. AUDIO CIRCUIT (Hi-Fi)

A.

No sound in the E-E mode

Is 12V applied to pin 1	No
of IC901?
Yes
	No
Is 5V applied to pin 16 ,
26 , 33 of IC901?
Yes

Check POWER circuit

Is signal input into	No
			Check IC151
pin #, [ of IC901
in TV mode?
Yes
Is signal input into	No		Check input jack
pin 3 , 46 of IC901
in LINE mode?
Yes
	No
Is pin 36 of IC901 0V?			Check SYSCON circuit
Yes
Is there output at	No
			Change IC901
pin 58 , 62 of IC901?

Yes

Check out JACK

20

B

No sound in the playback mode after reccording.

	Is the signal applied to	NO
	pin 46 of IC901?
	YES
		NO
	Is 5V applied to
	pin 6 of IC901?
	YES
		NO
	Is there output at
	pin 55 of IC901?
	YES
		NO
	Does T201 oscillate?
	YES

	Is record current	NO
	3.0mVrms?
	YES
		NO
	Is pin 2 of IC901 0V?
	YES
	Clean HEAD.

Check circuit adjacent to IC151.

Check IC601.

Check IC901.

Is the voltage above 12V at pin 3 of T201?

YES

Check Q212 collector:above 12V Base:0V

YES

Check T201.

Asjust Record current.

Check IC901.

NO

Check IC901.

NO	Check Q212, Q213

21

B.

No Hi-Fi Sound in playback mode

Is the ENVE level of pin 25		No
IC901 more than 280mVp-p?
Yes
		No
Is A SW PULSE input into
pin 27 of IC901?
Yes
		No
Is pin 23 of IC901 5V?

Yes

Change IC901

Check the ICH01 of PRE-AMP circuit

Check IC601

Is the ENVE. input into	No		Check C905
pin 25 of IC901?

Yes		Change
		IC901

22

3-4-2. NORMAL AUDIO CIRCUIT (Hi-Fi NOMAL PART)

A

No sound in the playback mode.

Is the output at pin 62	NO	Is 12V applied to pin 1
of IC901?		of IC901?
		YES
		Is 5V applied to pin 16 , 33
		of IC901?
		YES
		Is pin 6 of P901 0V?
		YES
		Is there Audio output
		pin 50 of IC901?
		YES
		Is pin 2 of IC901 GND?
		YES
		Check P601
		and AC Head.

NO	Check P901 pin 8 and
	power circuit.

NO

Check pin 9 of P902 and power circuit.

NO

NO

Check IC901.

23

3-4-3. NORMAL AUDIO CIRCUIT (DV-F683M/503M)

A

No sound in the playback mode.

Is the output at pin 22	NO	Is 12V applied to pin 7
of IC201?		of IC201?
		YES
		Is 5V applied to pin 11
		of IC201?
		YES
		Is pin 24 of IC201 0V?
		YES
		Is there Audio output
		pin 10 of IC201?
		YES
		Is pin 3 of IC201 GND?
		YES
		Check P601
		and AC Head.

NO

Check Q205

NO

Check IC601.

NO

NO

Check IC201.

24

B

No sound in the playback mode after reccording.

	Is the signal applied to	NO
	pin 16 of IC901?
	YES
		NO
	Is 5V applied to
	pin 24 of IC201?
	YES
		NO
	Is there output at
	pin 21 of IC201?
	YES
		NO
	Does T201 oscillate?
	YES

	Is record current	NO
	3.0mVrms?
	YES
		NO
	Is pin 1 of IC901 0V?
	YES
	Clean HEAD.

Check circuit adjacent to IC151.

Check IC601.

Check IC201.

Is the voltage above 10 V at pin 3 of T201?

YES

Check Q201 collector:above 10V Base:0V

YES

Check T201.

Asjust Record current.

Check IC201.

NO

Check IC201.

NO	Check Q201.

25

3-5. VIDEO CIRCUIT

A.EE MODE PIcture N.G

Is video signal input	NO
into pin 3 and 5 of IC151?
YES
	NO
Is 12V supplied at
pin 16 of IC151?
YES
	NO
Is signal output from
pin 16 of IC151?
YES

Is signal input into

NO

pin 13 of IC301?

YES

Check PIF circuit and LINE IN JACK.

Check ON/OFF 12V circuit.

	Check IC601 44 pin.	NO
	Tuner mode : H		Change IC601.
	Line mode : L

YES

Change IC151.

Check PCB pattern.

Is signal output from	NO		Is 5V supplied to pin 14
pin 17 of IC301?			and 39 , 41 of IC301?
			YES
YES
			Check D301 (+) port
			EE mode : L
			PB mode : H
	NO
Is signal input into			Check PCB pattern.
pin 18 of ICS01?
YES
	NO
Is signal output from			Check OSD circuit.
pin 16 of ICS01?
YES

RF out		Line out

NO

Check

power circuit.

HIGH

Check

IC60129 pin.

LOW

Check IC30118 pin.

H		L
Check		Change IC301
PCB pattern

26

B . MODE TABLE.

PIN NO				IC301			IC302
		24	30	32	41	5	20
NTSC MODE		H	X	H	H	H	H
PAL-M MODE		H	X	L	H	H	L
IC301 =	60Hz(H)
IC302 %
IC301 e	NAP
IC301 r	NTSC. H/PAL(L)
IC302 0
IC301 O	Filter change 3.58(H)

27