TEAC DV-3000 Service manual

MODEL

SERVICE MANUAL

(For USA & JAPAN Use)

CAUTION : Before servicing this chassis, read the "PRODUCT SAFETY SERVICE FOR VIDEO PRODUCTS" section
on page 2 of this manual.

DV-3000

DVD and CD
PLAYER

SPECIFICATIONS CONTENTS

DVD VIDEO PLAYER

Signal system
Laser
Frequency response
Signal/Noise ratio
Audio distortion+noise
Channel separation
Dynamic range

PAL/AUTO/NTSC
Wavelength 650nm
20Hz to 20kHz

85dB

-80dB(1kHz)
90dB(1kHz)
85dB(1kHz)

STANDBY/ON

POWER

PHONES

MIN MAX

DV-3000 DVD Player

DVD/VCD/CD

OPEN/CLOSE

PREVIOUS NEXT

REMOTE
SENSOR

SERVICE PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . 2-3

LOCATION OF CONTROLS . . . . . . . . . . . . . . . . . . . . . . 4-6

BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 7

ELECTRICAL TROUBLE SHOOTING GUIDE . .. . . . . . 8-18

PRINTED CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-25

EXPLODED VIEW/PARTS LIST(CABINET) . . . . .. . . . . . 26

REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . .. . . 28-31

STOP PLAY PAUSE/STEP

SEARCH

CD-R/CD-RW COMPATIBLE

OUTPUTS

Video outputs
S-video outputs

Audio outputs (digital audio)
Audio outputs (analog audio)

GENERAL

Power supply
Power consumption
Dimensions
Weight

1.0V(p-p), 75ohm, negative sync.
(Y)1.0V(p-p), (C)0.286V(p-p)
75ohm, negative sync.

0.5V(p-p), 75ohm

2.0Vrams(1KHz,0.8dB), 10Kohm

AC120V, 60Hz

20W
435 x 95 x 280 (mm)
Around 4kgs

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

CAUTION: DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY AND
NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT
MANUFACTURER'S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT
ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR
ANY RESULTING PROPERTY DAMAGE OR USER INJURY.

SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE
THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS
AND SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF
POTENTIAL HAZARDS AND INJURY TO THE USER.

WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION
FROM A.C. LINE SHOCK.

SAFETY CHECKS

AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRECTED, A CHECK
SHOULD BE MADE OF THE FOLLOWING.

SUBJECT: FIRE & SHOCK HAZARD

1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY AS
TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS. THIS IS
ESPECIALLY IMPORTANT ON THOSE MODULES WITCH ARE
TRANSPORTED TO AND FROM THE REPAIR SHOP.

2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES SUCH AS
INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWER
SUPPLY CORDS, AND OTHER HARDWARE HAVE BEEN REINSTALLED PER
ORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSE OF THE
POLARIZED LINE PLUG HAS NOT BEEN DEFEATED.

3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD
SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS. BE
CERTAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.

4. CHECK FOR PHYSICAL EVIDENCE DF DAMAGE OR DETERIORATION TO
PARTS AND COMPONENTS, FOR FRAYED LEADS AND DAMAGED
INSULATION (INCLUDING A.C. CORD), AND REPLACE IF NECESSARY
FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS.

5. NO LEAD OR COMPONENT SHOULD TOUCH A RECEIVING TUBE OR A
RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND
PROTRUDING METAL SURFACES MUST BE AVOIDED.

6. ALL CRITICAL COMPONENTS SUCH AS FUSES. FLAMEPROOF RESISTORS,
CAPACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES,
DO NOT USE REPLACEMENT COMPONENTS OTHER THAN THOSE
SPECIFIED OR MAKE UNRECOMMENDED CIRCUIT MODIFICATIONS.

7. AFTER RE-ASSEMBLY OF THE SET, ALWAYS PERFORM AN A.C. LEAKAGE
TEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET, (THE
CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HANDLE AND
SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE WITHOUT DANGER
OF ELECTRICAL SHOCK. DO NOT USE A LINE ISOLATION TRANSFORMER
DURING THIS TEST, MAKE SURE TO USE AN A.C. VOLTMETER. HAVING
5000 OHMS PER VOLT OR MORE SENSITIVITY, IN THE FOLLOWING
MANNER; CONNECT A 1500 OHMS 10 WATT RESISTOR, PARALLELED BY
A.15 MFD. 150V A.C. TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH
GROUND (WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED METALLIC
PARTS, ONE AT A TIME. MEASURE THE A.C. VOLTAGE ACROSS THE
COMBINATION OF 1500 OHM RESISTOR AND 15 MFD CAPACITOR.
REVERSE THE A.C. PLUG AND REPEAT A.C. ANY VOLTAGE
MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE
MEASURED MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS
TO 0.5 MILLIAMP A.C. ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A
POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY.

GOOD EARTH GROUND
SUCH AS THE WATER
PIPE, CONDUIT, ETC.

PLACE THIS PROBE
ON EACH EXPOSED
METAL PART

SUBJECT GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN
EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE
PERSONNEL TO THE PRESENCE OF UNINSULATED "DANGEROUS
VOLTAGE" THAT MAY BE OF SUFFICIENT MAGNITUDE TO
CONSTITUTE A RISK OF ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS
INTENDED TO ALERT THE SERVICE PERSONNEL TO THE
PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE
LITERATURE.

SUBJECT: X-RADIATION

1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PERSONNEL
COVER THE SUBJECT OF
X-RAYS IN CURRENT T.V. RECEIVERS IS THE PICTURE TUBE. HOWEVER,
THIS TUBE DOES NOT EMIT X-RYS WHEN THE HIGH VOLTAGE IS AT THE
FACTORY SPECIFIED LEVEL. THE PROPER VALUE IS GIVEN IN THE
APPLICABLE SCHEMATIC. OPERATION AT HIGHER VOLTAGES MAY CAUSE A
FAILURE OF THE PICTURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER
CERTAIN CIRCUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF
DESIRABLE LEVELS.

2. ONLY FACTORY SPECIFIED C.R.T ANODE CONNECTORS MUST BE USED.

DEGAUSSING SHIELDS ALSO SERVE AS AN X-RAY SHIELD IN COLOR SETS,
ALWAYS RE-INSTALL THEM.

3. IT IS ESSENTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN

ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRATION OF
THE METER SHOULD BE CHECKED PERIODICALLY AGAINST A
REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE AT YOUR
DISTRIBUTOR.

4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY, THERE IS

NO POSSIBILITY OF AN
CHASSIS IS SERVICED, THE BRIGHTNESS SHOULD BE RUN UP AND DOWN
WHILE MONITORING THE HIGH VOLTAGE WITH A METER TO BE CERTAIN
THAT THE HIGH VOLTAGE DOES NOT EXCEED THE SPECIFIED VALUE AND
THAT IT IS REGULATING CORRECTLY. WE SUGGEST THAT YOU AND YOUR
SERVICE ORGANIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE
REGULATION IS ALWAYS CHECKED AS A STANDARD SERVICING
PROCEDURE AND THAT THE HIGH VOLTAGE READING BE RECORDED ON
EACH CUSTOMER'S INVOICE.

5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN A

PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE AVOID BEING
UNNECESSARILY CLOSE TO THE PICTURE TUBE AND THE HIGH VOLTAGE
SUPPLY DO NOT OPERATE THE PRODUCT LONGER THAN IT IS NECESSARY
TO LOCATE THE CAUSE OF EXCESSIVE VOLTAGE.

6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES

DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS(WHERE
USED).

X-RADIATION. THE ONLY POTENTIAL SOURCE OF

X-RADIATION PROBLEM. EVERY TIME A COLOR

SUBJECT: IMPLOSION

1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTEGRAL

IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE TAKEN TO
AVOID DAMAGE DURING INSTALLATION, AVOID SCRATCHING THE TUBE. IF
SCRATCHED REPLACE IT.

2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.

SUBJECT: TIPS ON PROPER INSTALLATION

1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS. CUBBYHOLE OR

CLOSELY FITTING SHELF SPACE, OVER OR CLOSE TO HEAT DUCT, OR IN
THE PATH OF HEATED AIR FLOW.

2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO

INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIATORS
WHERE STEAM LEAKAGE IS A FACTOR, ETC.

3. AVOID PLACEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING.

THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE
SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VENTILATION.

4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCIAL

MOUNTING KIT, MUST FOLLOW THE FACTORY APPROVED MOUNTING
INSTRUCTIONS. A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUST
RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN SPACERS)
TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTOM. BOLTS OR
SCREWS USED FOR FASTENERS MUST NOT TOUCH ANY PARTS OR
WIRING. PERFORM LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS.

5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON

SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS
PROPERLY SECURED.

6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS

MOUNTING TO THE CART CAUTION THE CUSTOMER ON THE HAZARDS OF
TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHOLDS
OR DEEP PILE CARPETS.

7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH

HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. FOR USE
WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR
GENERICALLY APPROVED FOR USE WITH TV'S OF THE SAME OR LARGER
SCREEN SIZE.

8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS. EXPLAIN
THAT A FOREST OF EXTENSIONS SPROUTING FROM A SINGLE OUTLET
CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY.

2

SERVICING PRECAUTIONS

CAUTION : Before servicing the DVD covered by this
service data and its supplements and ADDENDUMS, read
and follow the SAFETY PRECAUTIONS NOTE : if
unforeseen circumstances create conflict between the
following servicing precautions and any of the safety
precautions in this publications, always follow the safety
precautions.

Remember Safety First:

General Servicing Precautions

1. Always unplug the DVD AC power cord from the AC
power source before:

(1) Removing or reinstalling any component, circuit board,

module, or any other assembly.

(2) Disconnection or reconnecting any internal electrical

plug or other electrical connection.

(3) Connecting a test substitute in parallel with an

electrolytic capacitor
Caution : A wrong part substitution or incorrect

polarity installation of electrolytic capacitors may
result in an explosion hazard.

2. Do not spray chemicals on or near this DVD or any of its

assemblies.

3. Unless specified otherwise in this service data, clean

electrical contacts by applying an appropriate contact
cleaning solution to the contacts with a pipe cleaner,
cotton-tipped swab, or comparable soft applicator.

Unless specified otherwise in this service data,
lubrication of contacts is not required.

4. Do not defeat any plug/socket B+ voltage interlocks with

witch instruments covered by this service manual might
be equipped.

5. Do not apply AC power to this DVD and/or any of its

electrical assemblies unless all solid-state device heat
sinks are correctly installed.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples of
typical ES devices are integrated circuits and some field
effect transistors and semiconductor chip components.

The following techniques should be used to help reduce the
incidence of component damage caused by static electricity.

1. Immediately before handling any semiconductor
component or semiconductor-equipped assembly, drain
off any electrostatic charge on your body by touching a
known earth ground. Alternatively, obtain and wear a
commercially available discharging wrist strap device,
which should be removed for potential shock reasons
prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ES

devices, place the assembly on a conductive surface
such as aluminum toil, to prevent electrostatic charge
buildup or exposure of the assembly.

3. Use only a GROUNDED-tip soldering iron to solder or

unsolder ES devices.

4. Use only an anti-static solder removal device. Some

solder removal devices not classified a "anti-static" can
generate electrical charges sufficient to damage ES
devices.

5. Do not use freon-propelled chemicals. These can

generate electrical charge sufficient to damage ES
devices.

6. Do not remove a replacement ES device from its

protective package until immediately before you are
ready to install it. (Most replacement ES devices are
packaged with leads electrically shorted together by
conductive foam, aluminum foil, or comparable
conductive material.)

6. Always connect test instrument ground lead to the
appropriate ground before connection the test
instrument positive lead. Always remove the test
instrument ground lead last.

Insulation Checking Procedure

Disconnect the attachment plug trom the AC outlet and turn
the power on. Connect an insulation resistance meter(500V)
to the blades of the attachment plug. The insulation
resistance between each blade of the attachment plug and
accessible conductive parts (Note 1) should be more than
1M ohm.

Note 1 : Accessible Conductive Parts including Metal
panels, input terminals, Earphone jacks, etc.

3

7. Immediately before removing the protective material
from the leads of a replacement ES device, touch the
protective material to the chassis or circuit assembly
into which the device will be installed.

Caution : Be sure no power is applied to the chassis or
circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged

replacement ES devices. (Normally harmless motion
such as the brushing together of your clothes fabric or the
lifting of your foot from a carpeted floor can generate
static electricity sufficient to damage an ES device.)

PREPARATIONS BEFORE OPERATION

FRONT PANEL

1 2 3 4 8 7 6 5

DV-3000 DVD Player

STANDBY/ON

POWER

PHONES

MIN MAX

REMOTE
SENSOR

1. POWER

2. STANDBY INDICATOR

3. DISC TRAY

DVD/VCD/CD

OPEN/CLOSE

PREVIOUS NEXT

STOP PLAY PAUSE/STEP

8. PREVIOUS/NEXT

9. SEARCH

10. REMOTE SENSOR

SEARCH

CD-R/CD-RW COMPATIBLE

911101213

4. OPEN/CLOSE

5. PAUSE/STEP

6. PLAY

7. STOP

11. DISPLAY

12. PHONES LEVEL

13. PHONES JACK

4

DISPLAY

VCD and CD

indicator

Pause indicator Title indicator

Play indicator

VCD

DVD indicator

PBC
indicator

Remain indicator

TITLE

PBC

Title/chapter/track
indicator

Chapter/track
indicator

CHP/TRK

REMAIN

Program indicator

Lock indicator

PROGRAM

indicator

Hour

Angel indicator

Minute

indicator

Dolby Digital
indicator

DIGITAL

MIN SEC

Second indicator

Repeat play
indicator

REPEAT

ONE
ALL

A B

1/2 2/3 D1

RESUME

Disc recording
format

Resume indicator

Track calender

3

1

2

7

5

6

11

9

10

13

15

14

12
16

Push DIMMER , the brightness of the display is reduced by half, push it once more, the
display becomes dark. Push the button again, the display resumes brightness.

REAR PANEL

4
8

1 2 3

DIGITALAUDIO OUT

VIDEO OUT

AUDIO OUT

1

2

R L 2

COAXIAL

1

OPTICAL

S-VIDEO

4 5 6 7 8 9

1 AUDIO OUT1 R

2 AUDIO OUT1 L

3 VIDEO OUT1

4 AUDIO OUT2 R

5 AUDIO OUT2 L

6 VIDEO OUT2

COMPONENT

VIDEO OUT

Y

C

B

C

R

11

10

7 S-VIDEO OUT

8 DIGITAL OUT(OPTICAL)

9 DIGITAL OUT(COAXIAL)

10 COMPONENT VIDEO

(Color Difference Output)

11 POWER SUPPLY CORD

5

NAMES AND LAYOUT OF REMOTE CONTROLS

1. OSD

2. DIMMER

3. NUMBER BUTTONS

10

22
12

15
13

31

4. SEARCH

5. SET UP

6. TITLE

7. PLAY

1
2

3

4

OSD DIMMER

1 2

4 5

7 8

10/0 +10

SEARCH

SETUP TITLE

5
6

7
8

9

SLOW

PLAY

PREV NEXT

STOP

SUBTITLE

- OUTPUT +

ANGLE

3 PLAY MODE

6 DIGEST

9

REMAIN

PAUSE

STEP

MENU

A-B REPEAT

MONO/

STEREO

POWER

STANDBY

TIME SEARCH

LAST MEMORY

ZOOM

OPEN/
CLOSE

RETURN

TV

SYSTEM

MUTING

32
28

27

26

25
23

30

19

18

11

14

29

24
21

20

17

16

8. PREVIOUS/NEXT

9. STOP

10. DIRECTIONS

11. TV SYSTEM

12. LANGUAGE

13. OUTPUT

14. MUTING

15. SUBTITLE

16. MONO/STEREO

17. A-B REPEAT

18. REPEAT

19. RETURN

20. MENU

21. PAUSE/STEP

22. SLOW

23. ZOOM

24. REMAIN

25. LAST MEMORY

26. TIME SEARCH

27. DIGEST

28. PLAY MODE

29. ANGLE

30. OPEN/CLOSE

31. REMOTE TRANSMITTER

32. POWER

6

XS109

TO OUTPUT

VGND

12V

GND

SPDIF5VZERO

AGD

CEN

R-S

AGD

AGND

WOOF

AGD

L-S

G/CVBS1

VGND

CVBS2

BLUE/AGND

LUMA

RED/AGND

CHROMA

VIDEO

ENCODER

CS4955/BT865

AGDLAGD

AUDIO DAC

PCM1723/PCM1720

BOARD

R

4M ROM

29F040

VCC
F
B
LD
GND
A
E
C
MD
VR
VC
NC
VR
MD
GND
LD
NC
GND
VCC
NC
NC
D
C
VC
B
A
RF
NC
NC
T­T+
F­F+

XS100

TO PICK UP

MECHANISM

27MHz

CHASSIS

RF AMP

16M SDRAM* 2

27MHz

HC04

33.868MHz

D1890

AUDIO DATA

EEPROM

24C01

MPEG-2

DECODER

VS2811EVS3811

/UPD3801-2811

ATAP I

INTERFACE

4M DRAM

SERVO &

DVD

PROCESSOR

D1870

CONTROL

BUS

D1850

CPU

TO POWER

SUPPLY BOARD

XS106

3.5V

3.5V
24V
GND
GND
GND

3.6V
Vcc
8V
12V
5V
POWER
12V

SERVO

& TRAY

DRIVER

BA5954

& BA6208

NC

POWER

12V

VCC

24V

3.5V

3.5V

GND

FCLK

FCS

FDATA

OPEN

GND

LIM

SP+

SP-

SLED-

SLED+

LOAD

UNLOD

GND

CLOSE

GND

RMC

NC

OVERALL BLOCK DIAGRAM

XS103

XS102

TO PICK UP

MECHANISM

CHASSIS

7

XS107

TO KEY BOARD

Electrical Trouble Shooting Guide

Connection of the unit is correct.

Setting of the unit is correct

Is power normal?

Yes

Is fluoresce display correct?

Yes

Is open/close normal?

Yes

Can disc be read?

Yes

Is video normal?

No

No

No

No

No

Refer to power guide.

Refer to display .guide

Refer to open/close .guide

Refer to read disc .guide

Refer to video .guide

Yes

Is audio normal?

Yes

Normal operation.

No

Refer to audio .guide

8

A Power Circuit abnormal

START

Is C328 AC 220V?

Yes

No

F301 is open.
XP301 is open.
XP302 is open.

Power cord isn't inserted firmly

or power cord is open.

Is C301 DC 310V?

Yes

Are 2,3 pin of N301 resistance

high impedance?

Yes

Are transformer secondary

6V, 15V output?

Yes

Is XP303 normal?

Yes

No

No

No

No

Check commute circuit.

Check L301 and L302.

Replace N301.

Check if transformer is damaged.
Check secondary commute circuit.
Check secondary feedback circuit.

Check if secondary short.

Check V304.

Check regulated circuit.

Check N302 and peripheral

components.

Normal

9