Sylvania 6720FDD Bedienungsanleitung

SERVICEMANUAL

Sec. 1: Main Section

ISpecifications

IPreparation for Servicing

IAdjustment Procedures

ISchematic Diagrams

ICBA’s

Sec. 2: Deck Mechanism Section

IStandard Maintenance

IAlignment for Mechanism

IDisassembly/Assembly of Mechanism

Sec. 3: Exploded views

and Parts List Section

IExploded views

IParts List

20" COLOR TV/DVD/VCR

6720FDD

1-8-1 TD900EA

ELECTRICAL ADJUSTMENT INSTRUCTIONS

General Note:

"CBA" is abbreviation for "Circuit Board

Assembly."

NOTE:

Electrical adjustments are required after replacing

circuit components and certain mechanical parts.

It is important to perform these adjustments only

after all repairs and replacements have been com-

pleted.

Also, do not attempt these adjustments unless the

proper equipment is available.

Test Equipment Required

1. NTSC Pattern Generator (Color Bar W/White Win-

dow, Red Color, Dot Pattern, Gray Scale, Mono-

scope, Multi-Burst)

2. AC Milli Voltmeter (RMS)

3. Alignment Tape (FL8A, FL8N), Blank Tape

4. DC Voltmeter

5. Oscilloscope: Dual-trace with 10:1 probe,

V-Range: 0.001~50V/Div,

F-Range: DC~AC-60MHz

6. Frequency Counter

7. Plastic Tip Driver

How to make service remote control

unit:

1. Prepare normal remote control unit (Part No.

NE200UD). Remove 4 screws from the back lid

(Fig. 1-1).

2. Cut off pin 10 of the remote control microprocessor

and short circuit pins 10 and 17 of the microproces-

sor with a jumper wire

How to Set up the Service mode:

Service Mode:

1. Use the service remote control unit.

2. Turn the power on. (Use main power on the TV

unit.)

3. To enter the TV mode, press CH UP or CH DOWN

button on the TV unit.

4. Press "DISC MENU" button on the service remote

control unit. (Version of micro computer will display

on the CRT. (Ex: 057-001)

X-Ray Protection Test

X-Ray protection test should be done when replacing

any parts of this chassis.

1. Short test points J520 and J522 (on H.V. CBA).

2. Confirm that the main power turns off.

3. If the main power does not turn off, then replace

the following parts (D591, Q591, R592, R593,

R594 and IC1201).

4. Perform steps 1 to 3 again.

1. DC 114V (+B) Adjustment

Purpose: To obtain correct operation.

Symptom of Misadjustment: The picture is dark and

unit does not operate correctly.

Note: J521(+B), J535(GND) --- H.V. CBA,

VR2601 --- Power Supply/AV CBA

1. Connect the unit to AC Power Outlet.

2. Connect DC Volt Meter to J521(+B) and

J535(GND).

3. Adjust VR2601 so that the voltage of J521(+B)

becomes +114±0.5V DC.

SCREW

Fig. 1-1

Remote control unit (Bottom)

Test point Adj. Point Mode Input

J521

(+B)

J535

(GND) VR2601 --- -----

Tape M. EQ. Spec.

--- DC Voltmeter +114±0.5V DC

1-8-2 TD900EA

2. H Adjustment

Purpose: To get correct horizontal position and size of

screen image.

Symptom of Misadjustment: Horizontal position and

size of screen image may not be properly displayed.

Note: R583 --- H.V. CBA

1. Connect Frequency Counter to R583.

2. Operate the unit for at least 20 minutes.

3. Enter the Service mode. (See page 1-8-1.) Press

"2" button on the remote control unit and select H-

ADJ Mode.

4. Press CH o/ pbuttons on the remote control unit

so that the display will change "0" to "7."

5. At this moment, choose display "0" to "7" when the

Frequency counter display is closest to

15.734kHz±300Hz.

6. Turn the power off and on again.

3. C-Trap Adjustment

Purpose: To get minimum leakage of the color signal

carrier.

Symptom of Misadjustment: If C-Trap Adjustment is

incorrect, stripes will appear on the screen.

Note: D1304 (Cathode) (B-Out)--- Main CBA

1. Connect Oscilloscope to D1304 (Cathode).

2. Input a color bar signal from RF input.

Enter the Service mode. (See page 1-8-1.)

3. Press "0" button on the remote control unit and

select C-TRAP Mode.

4. Press CH o/ pbuttons on the remote control unit

so that the carrier leakage B-Out (3.58MHz) value

becomes minimum on the oscilloscope.

5. Turn the power off and on again.

Test point Adj. Point Mode Input

R583 CH o/ p

buttons Video ---

Tape M. EQ. Spec.

--- Frequency Counter 15.734kHz±300Hz

Test point Adj. Point Mode Input

D1304

(Cathode)

(B-OUT) CH o/ p

buttons --- Color Bar

Tape M. EQ. Spec.

--- Oscilloscope

Pattern Generator ---

Figure

minimum

Fig. 2

1-8-3 TD900EA

4. V. Size Adjustment

Purpose: To obtain correct vertical height of screen

image.

Symptom of Misadjustment: If V. Size is incorrect,

vertical height of image on the screen may not be

properly displayed.

1. Enter the Service mode. (See page 1-8-1.)

Press "9" button on the remote control unit and

select V-S Mode. (Press "9" button then display will

change to V-P and V-S).

2. Input monoscope pattern.

3. Press CH o/ pbuttons on the remote control unit

so that the monoscope pattern is 90±5% of display

size and the circle is round.

5. V. Shift Adjustment

Purpose: To obtain correct vertical position of screen

image.

Symptom of Misadjustment: If V. position is incor-

rect, vertical position of image on the screen may not

be properly displayed.

1. Enter the Service mode. (See page 1-8-1.)

Press "9" button on the remote control unit and

select V-P Mode. (Press "9" button then display will

change to V-P and V-S).

2. Input monoscope pattern.

3. Press CH o/ pbuttons on the remote control unit

so that the top and bottom of the monoscope pat-

tern are equal to each other.

6. H. Shift Adjustment

Purpose: To obtain correct horizontal position and

size of screen image.

Symptom of Misadjustment: Horizontal position and

size of screen image may not be properly displayed.

1. Enter the Service mode. (See page 1-8-1.)

Press "8" button on the remote control unit and

select H-P Mode.

2. Input monoscope pattern.

3. Press CH o/ pbuttons on the remote control unit

so that the left and right side of the monoscope pat-

tern are equal to each other.

4. Turn the power off and on again.

7. Cut-off Adjustment

Purpose: To adjust the beam current of R, G, B, and

screen voltage.

Symptom of Misadjustment: White color may be

reddish, greenish or bluish.

Test point Adj. Point Mode Input

--- CH o/ p

buttons --- Monoscope

Tape M. EQ. Spec.

--- Pattern Generator 90±5%

Test point Adj. Point Mode Input

--- CH o/ p

buttons --- Monoscope

Tape M. EQ. Spec.

--- Pattern Generator ---

Test point Adj. Point Mode Input

--- CH o/ p

buttons --- Monoscope

Tape M. EQ. Spec.

--- Pattern Generator ---

Test point Adj. Point Mode Input

--- Screen-Control Ext. Black

Raster /

White

Raster

Tape M. EQ. Spec.

--- Pattern Generator See Reference

Notes below

Figure

ATTERN GENERATOR

RF INPUT

Fig. 3

1-8-4 TD900EA

Notes: Screen Control FBT --- H.V. CBA

FBT= Fly Back Transformer

Use the Remote Control Unit

1. Degauss the CRT and allow CRT to operate for 20

minutes before starting the alignment.

2. Input the Black raster signal from EXT. input.

3. Enter the Service mode. (See page 1-8-1.)

4. Press the "VOL p" button.

(Press "VOL p" then display will change CUT OFF/

DRIVE, 7Fh adjustment and DVD-KEY).

5. Choose CUT OFF/DRIVE mode then press "1" but-

ton. This adjustment mode is CUT OFF (R).

6. Increase the screen control so that the horizontal

line just appears on the CRT.

7. Press the "CH o/ p" button until the horizontal line

becomes white.

8. Choose CUT OFF/DRIVE mode then press "2" but-

ton. This adjustment mode is CUT OFF (G). Press

"CH o/ p" until the horizontal line becomes white.

9. Choose CUT OFF/DRIVE mode then press "3" but-

ton. This adjustment mode is CUT OFF (B). Press

"CH o/ p" until the horizontal line becomes white.

10.Choose CUT OFF/DRIVE mode then press "4" but-

ton.

11.Input the White Raster Signal from Video In.

12.Adjust the RED DRIVE as needed with the CH o/

pbuttons to get the following value, X= 286, Y=

294.

13.Choose CUT OFF/DRIVE mode then press "5."

Adjust the BLUE DRIVE as needed with the CH o/

pbuttons to get the following value, X= 286, Y=

294.

14.Turn the power off and on again.

8. Sub-Brightness Adjustment

Purpose: To get proper brightness.

Symptom of Misadjustment: If Sub-Brightness is

incorrect, proper brightness cannot be obtained by

adjusting the Brightness Control.

Note: SMPTE Setup level --- 7.5 IRE

1. Enter the Service Mode. (See page 1-8-1.)

Then input SMPTE signal from RF input.

2. Press PICTURE button. (Press PICTURE button

then display will change BRT, CNT, COL, TNT, and

V-T). Select BRT and press CH o/ pbuttons so

that the bar is just visible (See above figure).

3. Turn the power off and on again.

Test point Adj. Point Mode Input

--- CH o/ p

buttons --- SMPTE

7.5IRE

Tape M. EQ. Spec.

--- Pattern

Generator See below

Figure

Black

hite

This b

just

visible

Fig. 4

1-8-5 TD900EA

9. Focus Adjustment

Purpose: Set the optimum Focus.

Symptom of Misadjustment: If Focus Adjustment is

incorrect, blurred images are shown on the display.

Note: Focus VR (FBT) --- H.V. CBA

FBT= Fly Back Transformer

1. Operate the unit more than 30 minutes.

2. Face the unit to the East and degauss the CRT

using a Degaussing Coil.

3. Input the monoscope pattern.

4. Adjust the Focus Control on the FBT to obtain clear

picture.

10. SIF Adjustment

Purpose: To set the SIF (Sound Intermediate Fre-

quency).

Symptom of Misadjustment: Audio may not sound

correctly.

Note: This adjustment automatically done by the

chrominance IC (IC1301).

11. CCS Text Box Location

Note: This adjustment automatically done by the

microcomputer.

12. Head Switching Position Adjustment

Purpose: Determine the Head Switching Point during

Playback.

Symptom of Misadjustment: May cause Head

Switching Noise or Vertical Jitter in the picture.

Note: Unit reads Head Switching Position automati-

cally and displays it on the screen (Upper Left Corner).

1. Playback test tape (FL8A, FL8N).

2. Enter the Service Mode. (See page 1-8-1.)

Then press the number 5 button on the remote

control unit.

3. The Head Switching position will display on the

screen; if adjustment is necessary follow step 4.

6.5H(412.7µs) is preferable.

4. Press "CH o" or "CH p" button on the remote con-

trol unit if necessary. The value will be changed in

0.5H steps up or down. Adjustable range is up to

9.5H. If the value is beyond adjustable range, the

display will change as:

Lower out of range: 0.0H

Upper out of range: -.-H

5. Turn the power off and on again.

The following 2 adjustments normally are not

attempted in the field. They should be done

only when replacing the CRT then adjust as a

preparation.

13. Purity Adjustment

Purpose: To obtain pure color.

Symptom of Misadjustment: If Color Purity Adjust-

ment is incorrect, large areas of color may not be

properly displayed.

1. Set the unit facing east.

2. Operate the unit for over 30 minutes before adjust-

ing.

3. Fully degauss the unit using an external degauss-

ing coil.

4. Set the unit to the AUX Mode which is located

before CH2 then input a red raster from video in.

5. Loosen the screw on the Deflection Yoke Clamper

and pull the Deflection Yoke back away from the

screen. (See Fig. 6.)

6. Loosen the Ring Lock and adjust the Purity Mag-

nets so that a red field is obtained at the center of

the screen. Tighten Ring Lock. (See Fig. 5,6.)

7. Slowly push the Deflection Yoke toward the bell of

the CRT and set it where a uniform red field is

obtained.

8. Tighten the clamp screw on the Deflection Yoke.

Test point Adj. Point Mode Input

--- Focus Control --- Monoscope

Tape M. EQ. Spec.

--- Pattern Generator See below.

Test point Adj. Point Mode Input

--- Deflection Yoke

Purity Magnet --- Red Color

Tape M. EQ. Spec.

--- Pattern Generator See below.

Figure

BLUE

GREEN RED

Fig. 5

1-8-6 TD900EA

14. Convergence Adjustment

Purpose: To obtain proper convergence of red, green

and blue beams.

Symptom of Misadjustment: If Convergence Adjust-

ment is incorrect, the edge of white letters may have

color edges.

1. Set the unit to the AUX Mode which is located

before CH2, then input a Dot or crosshatch pattern.

2. Loosen the Ring Lock and align red with blue dots

or Crosshatch at the center of the screen by rotat-

ing (RB) C.P. Magnets. (See Fig. 7.)

3. Align red / blue with green dots at the center of the

screen by rotating (RB-G) C.P. Magnet.

(See Fig. 8.)

4. Fix the C.P. Magnets by tightening the Ring Lock.

5. Remove the DY Wedges and slightly tilt the Deflec-

tion Yoke horizontally and vertically to obtain the

best overall convergence.

6. Fix the Deflection Yoke by carefully inserting the

DY Wedges between CRT and Deflection Yoke.

Test point Adj. Point Mode Input

--- C.P. Magnet (RB),

C.P. Magnet (RB-G),

Deflection Yoke --- Dot Pattern

Crosshatch

Tape M. EQ. Spec.

--- Pattern Generator See below.

Figure

DY WEDGE

DEFLECTION YOKE

C.P. MAGNET

RING LOCK

SCREW

RB-G

PURITY

CRT COIL

COIL CLAMPER

C.P. MAGNET

CLAMPER

Fig.

C.P. MAGNET (RB)

C.P. MAGNET (RB-G)

1-9-1 TD945TEST

FIRMWARE RENEWAL MODE

1. Turn the power on and remove the disc on the tray.

2. To put the DVD player into version up mode, press

[9], [8], [7], [6], and [SEARCH MODE] buttons on

the remote control unit in that order. The tray will

open automatically.

Fig. a appears on the screen.

The DVD player can also enter the version up

mode with the tray open. In this case, Fig. a will be

shown on the screen while the tray is open.

3. Load the disc for version up.

4. The DVD player enters the F/W version up mode

automatically. Fig. b appears on the screen.

The appearance shown in (*2) of Fig. b is

described as follows:

5. After programming is finished, the tray opens auto-

matically. Fig. c appears on the screen.

At this time, no buttons are available.

6. Unplug the AC cord from the AC outlet. Then plug it

again.

7. Turn the power on by pressing the power button

and the tray will close.

8. Press [1], [2], [3], [4], and [DISPLAY] buttons on the

remote control unit in that order.

Fig. d appears on the screen.

9. Press [3] button on the remote control unit.

Fig. e appears on the screen.

10.To finish this mode, press [POWER] button.

F/W Version Up Mode

Please insert a DISC

for F/W Version Up.

EXIT: SELECT

Fig. a Version Up Mode Screen

Fig. b Programming Mode Screen

F/W Version Up Mode

VERSION : ********

Reading...(*2)

EXIT: SELECT

AppearanceNo. State

Reading... Sending files into the memory

Erasing... Erasing previous version data

Programming...

3 Writing new version data

Fig. c Completed Program Mode Screen

F/W Version Up Mode

VERSION : ********

Completed

SUM : 7abc (*3)

Fig. d

model: ****** Ver: **** Region: **

1: VFD TEST

2: TT REPEAT PLAY

3: EEPROM CLEAR

4: MEASUREMENT SERVO

5: DISC READ CHECK

6: MECHA CHECK

7: DISC INFO

8: ERROR RATE

EXIT: SELECTRETURN: -----

Fig. e

model: ****** Ver: **** Region: **

TEST 3: EEPROM CLEAR

EEPROM CLEAR: OK

EXIT: SELECTRETURN: -----

CONTROL

HEAD

CL1402

AC HEAD ASSEMBLY

MAIN CBA

POWER SUPPLY /AV CBA

RF-SW

T-REEL

DV-SYNC

C-SYNC C-SYNC

V-ENV

CTL(+)

D1224 S-LED

D1204 REC

D1216 DVD

D1217

TV/VCR

Q1210

Q1211

Q1207

P-ON+5V

REC-LED

KEY0

RS1201

REMOTE

SENSOR

KEY1

DVD-H

TV/VCR-LED

RESET

ROTA

D-REC-H D-REC-H

REC-SAFETY

A-MUTE

SCL

REMOTE

SDA

A-MUTE

CTL(-)

RF-SW

DV-SYNC

V-ENV

ROTA

IC1201

(SERVO/SYSTEM CONTROL)

AL+5V

CTL-AMP-OUT

DVD-REMOTE

CTL-AMP-OUT

TP1201

(DECK ASSEMBLY)

Servo/System Control Block Diagram

BLOCK DIAGRAMS <TV/VCR Section>

T-REEL

Q1206

Q1205

RESET

TIMER+5V

ST/SAP-MODE

4NORMAL-H

EXT-H 29

RENTAL 30

SPL-PLAY

SP/LP/SLP

EXT-H

RENTAL

SPL-PLAY

REC/EE/PB REC/EE/PB

VOL-CONT VOL-CONT

11 EXT-H

A-MUTE

JACK-MUTE JACK-MUTE

DVD-MAIN-POWER

SW1211

REC

SAFETY

FROM/TO

VIDEO BLOCK

FROM/TO

AUDIO BLOCK

FROM/TO

Hi-Fi AUDIO

BLOCK

1-10-1 1-10-2 TD900BLS

SCL

(MEMORY)

SDA

P-DOWN 84

P-ON-H P-DOWN

P-ON-H

LD-SW1

I2C-OPEN 45

AL+5V

SW1212

LD-SW

FROM/TO

POWER

SUPPLY BLOCK

SDA

SCL FROM/TO

CHROMA

BLOCK

IC1202

WF3

ENV-DET 17

V-H-SW ENV-DET

V-H-SW

SDA

SCL

Hi-Fi-H-SW

ST/SAP-IN

NORMAL-H

DVD-MAIN-POWER

Hi-Fi-H-SW

DVD-H

DVD-A-MUTE

KEY SWITCH

SW1201 SW1203,

SW1206 SW1210

5 5KEY1

CN2805

CN2803

CN1805

KEY SWITCH

SW2401 SW2408

12SDATA

1220 SDATA

FROM/TO

DVD SYSTEM

CONTROL/SERVO

BLOCK

CN401

CN2402

CN1804

13SCLK

14CS

DVD-REMOTE

1P-ON+12V(2)

5C-CONT

FG-GND

7LD-CONT

CAPSTAN

MOTOR

CAPSTAN MOTOR

P-ON+5V

D/L+15V

P-ON+12V

10M-GND

11D/L+12V

9D-PFG

12D/L+15V

END-SENS.

Q201

SENSOR CBA

(END-SENSOR)

ST-SENS.

Q202

SENSOR CBA

(ST-SENSOR)

21 SCLK

18 CS

DVD-REMOTE

SDATA

SCLK

DVD-A-MUTE

5CTL(+)

6CTL(-)

8D-CONT

C-F/R

3C-FG

2P-ON+5V(3)

C-F/R

C-FG

C-CONT

LD-CONT

D-CONT

D-PFG

CL1201

MOTOR

CYLINDER ASSEMBLY

DRUM

MOTOR

SENSOR

ST-SENS.

END-SENS.

AFT

D-REC-H

SP/LP/SLP

FUNCTION CBA

Q2621

Q2622

Q2623

Video Block Diagram

1-10-3 1-10-4 TD900BLV

REC VIDEO SIGNAL PB VIDEO SIGNAL MODE: SP/REC

LUMINANCE

SIGNAL PROCESS

MAIN CBA

CL1401

Q1401

TP1402

V-OUT

V-AGC

R P

FBC

Y/C

MIX

CCD 1H

DELAY

DOC YNR Y/C COMB

CHROMINANCE

SIGNAL PROCESS

IC1401

VIDEO/AUDIO

SIGNAL PROCESS 35

CHARA

MIX

6dB

AMP

VXO

ENV

DET

AGC

AMP

HPF

FROM

SERVO/SYSTEM

CONTROL BLOCK

RF-SW

TP1401

WF1

TP1403

HA-MONITOR

BUFFER

DV-SYNC

SP/LP/SLP

ROTA

DV-SYNC

ROTA

SPL-PLAY

REC/EE/PB

RENTAL

SPL-PLAY

REC/EE/PB

RENTAL

EXT-H

45 47 49 44

Q1402

WF6

WF5

WF4

WF2

VIDEO (R)-1 HEAD

VIDEO (L)-1 HEAD

(DECK ASSEMBLY)

V(R)-1

V-COM

V(L)-1

V(L)-2

V-COM

V(R)-2

FROM/TO

SERVO/SYSTEM

CONTROL BLOCK

CYLINDER ASSEMBLY

RF-SW

V-ENV

V-H-SW

ENV-DET ENV-DET

VIDEO (L)-2 HEAD

VIDEO (R)-2 HEAD

CHROMA

BLOCK

62 61

X1401

3.58MHz

VIDEO

V-OUT

TV-

EXT-V-IN

VIDEO

TU1001

(TUNER UNIT)

JK1701

VIDEO-IN

SP/LP/SLP

BUFFER

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