Toshiba 20AF46, 20AF46C Service Manual

FILE NO. 050-200601GR

(MFR’S VERSION B)

SERVICE MANUAL

COLOR TELEVISION

20AF46

20AF46C

The above model is classified as a green product (*1), as indicated by the underlined serial number. This Service Manual describes replacement parts for the green product. When repairing this green product, use the part(s) described in this manual and lead-free solder (*2).

For (*1) and (*2), see the next page.

DOCUMENT CREATED IN JAPAN, January, 2006 GREEN

(*1) GREEN PRODUCT PROCUREMENT

The EC is actively promoting the WEEE & RoHS Directives that define standards for recycling and reuse of Waste Electrical and Electronic Equipment and for the Restriction of the use of certain Hazardous Substances. From July 1, 2006, the RoHS Directive will prohibit any marketing of new products containing the restricted substances.

Increasing attention is given to issues related to the global environmental. Toshiba Corporation recognizes environmental protection as a key management tasks, and is doing its utmost to enhance and improve the quality and scope of its environmental activities. In line with this, Toshiba proactively promotes Green Procurement, and seeks to purchase and use products, parts and materials that have low environmental impacts.

Green procurement of parts is not only confined to manufacture. The same green parts used in manufacture must also be used as replacement parts.

(*2) LEAD-FREE SOLDER

This product is manufactured using lead-free solder as a part of a movement within the consumer products industry at large to be environmentally responsible. Lead-free solder must be used in the servicing and repair of this product.

WARNING

This product is manufactured using lead free solder .

DO NOT USE LEAD BASED SOLDER TO REPAIR THIS PRODUCT !

The melting temperature of lead-free solder is higher than that of leaded solder by 86°F to 104°F (30°C to 40°C). Use of a soldering iron designed for lead-based solders to repair product made with lead-free solder may result in damage to the component and or PCB being soldered. Great care should be made to ensure high-quality soldering when servicing this product  especially when soldering large components, through-hole pins, and on PCBs  as the level of heat required to melt lead-free solder is high.

A1-1 20AF46/20AF46C

SERVICING NOTICES ON CHECKING

As for the places which need special attentions, they are indicated with the labels or seals on the cabinet, chassis and parts. Make sure to keep the indications and notices in the operation manual.

2. AVOID AN ELECTRIC SHOCK

There is a high voltage part inside. Avoid an electric shock while the electric current is flowing.

3. USE THE DESIGNATED PARTS

The parts in this equipment have the specific characters of incombustibility and withstand voltage for safety. Therefore, the part which is replaced should be used the part which has the same character. Especially as to the important parts for safety which is indicated in the circuit diagram or the table of parts as a mark, the designated parts must be used.

4. PUT PARTS AND WIRES IN THE ORIGINAL POSITION AFTER ASSEMBLING OR WIRING

There are parts which use the insulation material such as a tube or tape for safety, or which are assembled in the condition that these do not contact with the printed board. The inside wiring is designed not to get closer to the pyrogenic parts and high voltage parts. Therefore, put these parts in the original positions.

5. TAKE CARE TO DEAL WITH THE CATHODE-RAY TUBE

In the condition that an explosion-proof cathoderay tube is set in this equipment, safety is secured against implosion. However, when removing it or serving from backward, it is dangerous to give a shock. Take enough care to deal with it.

6. AVOID AN X-RAY1. KEEP THE NOTICES

Safety is secured against an X-ray by considering about the cathode-ray tube and the high voltage peripheral circuit, etc. Therefore, when repairing the high voltage peripheral circuit, use the designated parts and make sure not modify the circuit. Repairing except indicates causes rising of high voltage, and it emits an X-ray from the cathoderay tube.

PERFORM A SAFETY CHECK AFTER

7. SERVICING

Confirm that the screws, parts and wiring which were removed in order to service are put in the original positions, or whether there are the portions which are deteriorated around the serviced places serviced or not. Check the insulation between the antenna terminal or external metal and the AC cord plug blades. And be sure the safety of that.

(INSULATION CHECK PROCEDURE)

Unplug the plug from the AC outlet.

Remove the antenna terminal on TV and turn on the TV.

Insulation resistance between the cord plug terminals and the eternal exposure metal [Note 2] should be more than 1M ohm by using the 500V insulation resistance meter [Note 1].

If the insulation resistance is less than 1M ohm, the inspection repair should be required.

[Note 1]

If you have not the 500V insulation resistance meter, use a Tester.

[Note 2]

External exposure metal: Antenna terminal

Headphone jack

HOW TO ORDER PARTS

Please include the following informations when you order parts. (Particularly the VERSION LETTER.)

1. MODEL NUMBER and VERSION LETTER The MODEL NUMBER can be found on the back of each product and the VERSION LETTER can be

found at the end of the SERIAL NUMBER.

2. PART NO. and DESCRIPTION You can find it in your SERVICE MANUAL.

IMPORTANT

When you exchange IC and Transistor with a heat sink, apply silicon grease on the contact section of the heat sink. Befor applying new silicon grease, remove all the old silicon grease. (Old grease may cause damages to the IC and Transistor.)

A1-2

20AF46/20AF46C

TABLE OF CONTENTS

GREEN PRODUCT PROCUREMENT ........................................................................................

LEAD-FREE SOLDER ................................................................................................................

SERVICING NOTICES ON CHECKING.....................................................................................

HOW TO ORDER PARTS ..........................................................................................................

IMPORTANT ...............................................................................................................................

TABLE OF CONTENTS..............................................................................................................

GENERAL SPECIFICATIONS ...................................................................................................

DISASSEMBLY INSTRUCTIONS

1. REMOVAL OF ANODE CAP ...............................................................................................

2. REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ................................................

SERVICE MODE LIST ................................................................................................................

CONFIRMATION OF HOURS USED .........................................................................................

WHEN REPLACING EEPROM (MEMORY) IC ..........................................................................

ELECTRICAL ADJUSTMENTS..................................................................................................

BLOCK DIAGRAM......................................................................................................................

PRINTED CIRCUIT BOARDS

MAIN/CRT................................................................................................................................

SCHEMATIC DIAGRAMS

MICON .....................................................................................................................................

CHROMA .................................................................................................................................

DEFLECTION ..........................................................................................................................

POWER ...................................................................................................................................

SOUND ....................................................................................................................................

TUNER/STEREO.....................................................................................................................

COMB FILTER/AV...................................................................................................................

CRT..........................................................................................................................................

WAVEFORMS .............................................................................................................................

MECHANICAL EXPLODED VIEWS...........................................................................................

MECHANICAL REPLACEMENT PARTS LIST .........................................................................

ELECTRICAL REPLACEMENT PARTS LIST...........................................................................

A1-1 A1-1 A1-2 A1-2 A1-2 A2-1 A3-1~A3-10

B1-1 B2-1, B2-2 C-1 C-1 C-2 D-1~D-5 E-1, E-2

F-1~F-4

G-1, G-2 G-3, G-4 G-5, G-6 G-7, G-8 G-9, G-10 G-11, G-12 G-13, G-14 G-15, G-16 H-1, H-2 I-1, I-2 J1-1, J1-2 J2-1~J2-8

A2-1

20AF46/20AF46C

GENERAL SPECIFICATIONS

G-1 TV CRT CRT Size / Visual Size 20 inch / 508mmV

G-2 Tuning Broadcasting System US System M

G-3 Power Power Source AC 120V AC 60Hz

G-4 Regulation Safety UL

G-5 Temperature Operation +5oC ~ +40oC

G-6 Operating Humidity Less than 80% RH

System CRT Type Flat

Color System NTSC Speaker 2 Speaker

Sound Output MAX

NTSC3.58+4.43 /PAL60Hz No

System Tuner and System 1Tuner

Receive CH Destination USA(W/ Cable)

Intermediate Picture(FP) 45.75MHz Frequency Sound(FS) 41.25MHz

Preset CH Stereo/Dual TV Sound Yes Tuner Sound Muting Yes

Power Consumption at AC

Protector Power Fuse Yes

Magnetic Field BV/BH +0.45G/0.18G

Position Front Side Size Impedance 8 ohm

10%(Typical) - W

CH Coverage A - I, J - W, W+1 - W+84

FP-FS 4.50MHz

Stand by (at AC) Per Year

Safety Circuit Yes IC Protector(Micro Fuse) No

Radiation FCC X-Radiation DHHS

Storage -20oC ~ +60oC

2 x 4.7 Inch

2.5+2.5 W

2 - 69, 4A, A-5 - A-1,

105 W at AC 120 V 60 Hz 3 W at AC 120 V 60 Hz

-- kWh/Year

A3-1 20AF46

GENERAL SPECIFICATIONS

G-7 On Screen Menu Yes

G-8 OSD Language English French Spanish

Display Menu Type Icon

Picture Yes

Sound Yes

Set Up Yes

Option

Control Level Yes

Stereo,Audio Output,SAP Yes Video Yes Color Stream Yes Channel(TV/Cable) Yes CH Label Yes Game Timer Yes Sleep Timer Yes Sound Mute Yes V-chip Rating Yes 16: 9 Yes

Contrast Yes Brightness Yes Color Yes Tint Yes Sharpness Yes

Bass Yes Treble Yes Balance Yes BBE On/Off No Stable Sound On/Off Yes Surround On/Off Yes

TV/Cable Yes Auto CH Memory Yes Add/ Delete Yes

Yes Language Yes CH Label Yes Favorite CH Yes V-Chip Yes Lock Yes On/Off Timer Yes Color Stream DVD/DTV Yes

Volume Yes Brightness Yes Contrast Yes Color Yes Tint Yes Sharpness Yes Tuning No Bass Yes Treble Yes Balance Yes Back Light No

G-9 Clock and Sleep Timer Max Time 120 Min

Timer Step 10 Min

On/Off Timer Program(On Timer / Off Timer / Clock) Yes Wake Up Timer No Timer Back-up (at Power Off Mode) more than -- Min Sec

A3-2 20AF46

GENERAL SPECIFICATIONS

G-10 Remote Unit RC-GQ

Control Glow in Dark Remocon Yes

Format Toshiba Remocon Format Toshiba Custom Code Power Source Voltage(D.C) 3V

UM size x pcs UM-4 x 2 pcs

Total Keys 30 Keys Keys Power Yes

1 Yes 2 Yes 3 Yes 4 Yes 5 Yes 6 Yes 7 Yes 8 Yes 9 Yes 0 Yes 100 Yes CH Up Yes CH Down Yes Volume Up Yes Volume Down Yes Cap/Text(TV/Caption/Text) Yes 1/2(CH1/CH2) Yes TV/Video(TV/AV) Yes CH RTN(Quick View) Yes Sleep Yes RECall(Call) Yes Reset Yes Menu/Enter Yes Mute Yes Exit Yes MTS(Audio Select) Yes Fav.Up Yes Fav.Down Yes 16: 9 Yes

Multi Brand Keys CH Up(VCR) No

CH Down(VCR) No Pause/Still No TV/VCR(VCR) No FF No Rew No Rec No Play No Stop No TV No VCR No Cable No DVD No CODE No DVD MENU < No DVD MENU > No DVD CLEAR No TOP MENU No DVD MENU No

TV:40-BF h

A3-3 20AF46

GENERAL SPECIFICATIONS

G-11 Features Auto Degauss Yes

G-12 Accessories Owner's Manual Language English/Spanish

Auto Shut Off Yes Canal+ No Cable Yes Anti-theft No Rental No Memory(Last CH) Yes Memory(Last Volume) Yes V-Chip Yes

BBE No Auto Search No CH Allocation No SAP Yes Just Clock Function No CH Label Yes VM Circuit No Full OSD No Premiere No Comb Filter Yes

Auto CH Memory Yes Hotel Lock No Closed Caption Yes Stable Sound Yes FBT Leak Test Protect Yes CH Lock Yes Video Lock Yes Game Timer (Max Time:120 Min) Yes Energy Star No Favorite CH Yes Surround Yes 16:9 Mode Yes

Remote Control Unit Yes Rod Antenna

Loop Antenna

U/V Mixer DC Car Cord (Center+) Guarantee Card Warning Sheet Circuit Diagram Antenna Change Plug Service Station List Important Safety Instruction Dew/AHC Caution Sheet AC Plug Adapter Quick Set-up Sheet Battery Yes

AC Cord AV Cord (2Pin-1Pin) Registration Card (NDL Card) Yes PTB Sheet ESP Card 300 ohm to 75 ohm Antenna Adapter

Type USA,Toshiba Type

2 Lines

W/ Warranty Yes

Poles Terminal

Terminal -

UM size x pcs UM-4 x 2 OEM Brand

No No No No No No No No No No No

No No No

A3-4 20AF46

GENERAL SPECIFICATIONS

G-13 Interface Switch Front Power Yes

Rear AC/DC No

Indicator Power Yes(RED)

Terminals Front Video Input = VIDEO2

Rear Video Input(Rear1) = VIDEO1

G-14 Set Size Approx. W x D x H (mm) G-15 Weight Net (Approx.)

G-16 Carton Master Carton

Gift Box Material Double/Brown

Drop Test

Container Stuffing

G-17 Cabinet Material Cabinet Cabinet Front PS 94V0 DECABROM

PCB Non-Halogen Demand

G-18 Environment Environmental standard requirement Green procurement of TOSHIBA

Pb-free Phase3(Phase3A)

System Select No Main Power SW No Sub Power No Channel Up Yes Channel Down Yes Volume Up Yes Volume Down Yes

TV/Cable Selector No Degauss No Main Power SW No

Stand-by No On Timer No

Audio Input = VIDEO2 Other Terminal

Video Input(Rear2) = VIDEO2 No Audio Input(Rear1) = VIDEO1 Audio Input(Rear2) = VIDEO2 No Video Output No Audio Output No Euro Scart No Color Stream S Input Yes Diversity No Ext Speaker No DC Jack 12V(Center +) No VHF/UHF Antenna Input AC Outlet No

Gross (Approx.)

Content ---Material -- Dimensions W x D x H(mm) -- x -- x -- Description of Origin

Dimensions W x D x H(mm) 695 x 575 x 549 Description of Origin Yes

Height (cm) 60 (ORION SPEC:46)

Cabinet Rear PS 94V0 DECABROM

Eyelet Demand Yes

RCA

RCA x 2(L/MONO,R)

Head Phone

RCA

RCA x 2(L/MONO,R)

RCA x 3

F Type

590 x 484 x 446.5

23 kg

26.5 kg

Natural Dropping At 1 Corner / 3

272

( 50.6 lbs) ( 58.3 lbs) No Sets /--

Edges / 6 Surfaces

Sets/40' container

A3-5 20AF46

GENERAL SPECIFICATIONS

G-1 TV CRT CRT Size / Visual Size 20 inch / 508mmV

G-2 Tuning Broadcasting System US System M

G-3 Power Power Source AC 120V AC 60Hz

G-4 Regulation Safety CSA

G-5 Temperature Operation +5oC ~ +40oC

G-6 Operating Humidity Less than 80% RH

System CRT Type Flat

Color System NTSC Speaker 2 Speaker

Sound Output MAX

NTSC3.58+4.43 /PAL60Hz No

System Tuner and System 1Tuner

Receive CH Destination USA(W/ Cable)

Intermediate Picture(FP) 45.75MHz Frequency Sound(FS) 41.25MHz

Preset CH Stereo/Dual TV Sound Yes Tuner Sound Muting Yes

Power Consumption at AC

Protector Power Fuse Yes

Magnetic Field BV/BH +0.45G/0.18G

Position Front Side Size Impedance 8 ohm

10%(Typical) - W

CH Coverage A - I, J - W, W+1 - W+84

FP-FS 4.50MHz

Stand by (at AC) Per Year

Safety Circuit Yes IC Protector(Micro Fuse) No

Radiation IC X-Radiation HWC

Storage -20oC ~ +60oC

2 x 4.7 Inch

2.5+2.5 W

2 - 69, 4A, A-5 - A-1,

105 W at AC 120 V 60 Hz 3 W at AC 120 V 60 Hz

-- kWh/Year

A3-6 20AF46C

GENERAL SPECIFICATIONS

G-7 On Screen Menu Yes

G-8 OSD Language English French Spanish

Display Menu Type Icon

Picture Yes

Sound Yes

Set Up Yes

Option

Control Level Yes

Stereo,Audio Output,SAP Yes Video Yes Color Stream Yes Channel(TV/Cable) Yes CH Label Yes Game Timer Yes Sleep Timer Yes Sound Mute Yes V-chip Rating No 16: 9 Yes

Contrast Yes Brightness Yes Color Yes Tint Yes Sharpness Yes

Bass Yes Treble Yes Balance Yes BBE On/Off No Stable Sound On/Off Yes Surround On/Off Yes

TV/Cable Yes Auto CH Memory Yes Add/ Delete Yes

Yes Language Yes CH Label Yes Favorite CH Yes V-Chip No Lock Yes On/Off Timer Yes Color Stream DVD/DTV Yes

Volume Yes Brightness Yes Contrast Yes Color Yes Tint Yes Sharpness Yes Tuning No Bass Yes Treble Yes Balance Yes Back Light No

G-9 Clock and Sleep Timer Max Time 120 Min

Timer Step 10 Min

On/Off Timer Program(On Timer / Off Timer / Clock) Yes Wake Up Timer No Timer Back-up (at Power Off Mode) more than -- Min Sec

A3-7 20AF46C

GENERAL SPECIFICATIONS

G-10 Remote Unit RC-GQ

Control Glow in Dark Remocon Yes

Format Toshiba Remocon Format Toshiba Custom Code Power Source Voltage(D.C) 3V

UM size x pcs UM-4 x 2 pcs

Total Keys 30 Keys Keys Power Yes

Multi Brand Keys CH Up(VCR) No

CH Down(VCR) No Pause/Still No TV/VCR(VCR) No FF No Rew No Rec No Play No Stop No TV No VCR No Cable No DVD No CODE No DVD MENU < No DVD MENU > No DVD CLEAR No TOP MENU No DVD MENU No

TV:40-BF h

A3-8 20AF46C

GENERAL SPECIFICATIONS

G-11 Features Auto Degauss Yes

G-12 Accessories Owner's Manual Language English / French

Auto Shut Off Yes Canal+ No Cable Yes Anti-theft No Rental No Memory(Last CH) Yes Memory(Last Volume) Yes V-Chip No

BBE No Auto Search No CH Allocation No SAP Yes Just Clock Function No CH Label Yes VM Circuit No Full OSD No Premiere No Comb Filter Yes

Remote Control Unit Yes Rod Antenna

Loop Antenna

AC Cord AV Cord (2Pin-1Pin) Registration Card (NDL Card) PTB Sheet ESP Card 300 ohm to 75 ohm Antenna Adapter

Type - Type

2 Lines

W/ Warranty Yes

Poles Terminal

Terminal -

UM size x pcs UM-4 x 2 OEM Brand

No No No No No No No No No No No

No No No No No No No

A3-9 20AF46C

GENERAL SPECIFICATIONS

G-13 Interface Switch Front Power Yes

Rear AC/DC No

Indicator Power Yes(RED)

Terminals Front Video Input = VIDEO2

Rear Video Input(Rear1) = VIDEO1

G-14 Set Size Approx. W x D x H (mm) G-15 Weight Net (Approx.)

G-16 Carton Master Carton

Gift Box Material Double/Brown

Drop Test

Container Stuffing

G-17 Cabinet Material Cabinet Cabinet Front PS 94V0 DECABROM

PCB Non-Halogen Demand

G-18 Environment Environmental standard requirement Green procurement of TOSHIBA

Pb-free Phase3(Phase3A)

System Select No Main Power SW No Sub Power No Channel Up Yes Channel Down Yes Volume Up Yes Volume Down Yes

TV/Cable Selector No Degauss No Main Power SW No

Stand-by No On Timer No

Audio Input = VIDEO2 Other Terminal

Gross (Approx.)

Content ---Material -- Dimensions W x D x H(mm) -- x -- x -- Description of Origin

Dimensions W x D x H(mm) 695 x 575 x 549 Description of Origin Yes

Height (cm) 60 (ORION SPEC:46)

Cabinet Rear PS 94V0 DECABROM

Eyelet Demand Yes

RCA

RCA x 2(L/MONO,R)

Head Phone

RCA

RCA x 2(L/MONO,R)

RCA x 3

F Type

590 x 484 x 446.5

23 kg

26.5 kg

Natural Dropping At 1 Corner / 3

272

( 50.6 lbs) ( 58.3 lbs) No Sets /--

Edges / 6 Surfaces

Sets/40' container

A3-10 20AF46C

DISASSEMBLY INSTRUCTIONS

1. REMOVAL OF ANODE CAP

Read the following NOTED items before starting work. *

After turning the power off there might still be a potential voltage that is very dangerous. When removing the Anode Cap, make sure to discharge the Anode Cap's potential voltage.

Do not use pliers to loosen or tighten the Anode Cap terminal, this may cause the spring to be damaged.

REMOVAL

1. Follow the steps as follows to discharge the Anode Cap.

(Refer to Fig. 1-1.)

Connect one end of an Alligator Clip to the metal part of a flat-blade screwdriver and the other end to ground. While holding the plastic part of the insulated Screwdriver, touch the support of the Anode with the tip of the Screwdriver. A cracking noise will be heard as the voltage is discharged.

GND on the CRT

3. After one side is removed, pull in the opposite direction to remove the other.

NOTE

Take care not to damage the Rubber Cap.

INSTALLATION

1. Clean the spot where the cap was located with a small amount of alcohol. (Refer to Fig. 1-3.)

Location of Anode Cap

Fig. 1-3

NOTE

Confirm that there is no dirt, dust, etc. at the spot where the cap was located.

2.3.Arrange the wire of the Anode Cap and make sure the wire is not twisted. Turn over the Rubber Cap. (Refer to Fig. 1-4.)

Screwdriver

Alligator Clip

GND on the CRT

Flip up the sides of the Rubber Cap in the direction of the

2. arrow and remove one side of the support.

(Refer to Fig. 1-2.)

Rubber Cap

CRT

Support

CRT

Fig. 1-1

Fig. 1-2

Fig. 1-4

4. Insert one end of the Anode Support into the anode button, then the other as shown in Fig. 1-5.

Support

CRT

5.6.Confirm that the Support is securely connected. Put on the Rubber Cap without moving any parts.

B1-1 20AF46/20AF46C

Fig. 1-5

DISASSEMBLY INSTRUCTIONS

REMOVAL AND INSTALLATION OF FLAT PACKAGE IC

REMOVAL

Put Masking Tape (cotton tape) around the Flat Package

1. IC to protect other parts from any damage.

(Refer to Fig. 2-1.) NOTE

Masking is carried out on all the parts located within 10 mm distance from IC leads.

When IC starts moving back and forth easily after

3. desoldering completely, pickup the corner of the IC using a tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 2-3.)

NOTE

Some ICs on the PCB are affixed with glue, so be careful not to break or damage the foil of each IC leads or solder lands under the IC when removing it.

Blower type IC desoldering machine

Masking Tape (Cotton Tape)

Heat the IC leads using a blower type IC desoldering

machine. (Refer to Fig. 2-2.)

NOTE

Do not rotate or move the IC back and forth , until IC can move back and forth easily after desoldering the leads completely.

Blower type IC desoldering machine

Fig. 2-1

Tweezers

Peel off the Masking Tape.4. Absorb the solder left on the pattern using the Braided

5. Shield Wire. (Refer to Fig. 2-4.)

NOTE

Do not move the Braided Shield Wire in the vertical direction towards the IC pattern.

Fig. 2-3

Braided Shield Wire

Soldering Iron

Fig. 2-2

IC pattern

Fig. 2-4

B2-1 20AF46/20AF46C

DISASSEMBLY INSTRUCTIONS

INSTALLATION

Take care of the polarity of new IC and then install the new

1. IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily.

(Refer to Fig. 2-5.)

Soldering Iron

Solder temporarily

Supply the solder from the upper position of IC leads

2. sliding to the lower position of the IC leads. (Refer to Fig. 2-6.)

Solder temporarily

Fig. 2-5

When bridge-soldering between terminals and/or the

4. soldering amount are not enough, resolder using a Thin-tip Soldering Iron. (Refer to Fig. 2-8.)

Thin-tip Soldering Iron

Fig. 2-8

Finally, confirm the soldering status on four sides of the IC

5. using a magnifying glass. Confirm that no abnormality is found on the soldering position and installation position of the parts around the IC. If some abnormality is found, correct by resoldering.

NOTE

When the IC leads are bent during soldering and/or repairing, do not repair the bending of leads. If the bending of leads are repaired, the pattern may be damaged. So, always be sure to replace the IC in this case.

Soldering IronSolder

Supply soldering from upper position to lower position

Fig. 2-6

Absorb the solder left on the lead using the Braided Shield

3. Wire. (Refer to Fig. 2-7.)

NOTE

Do not absorb the solder to excess.

Soldering Iron

Braided Shield Wire

Fig. 2-7

B2-2 20AF46/20AF46C

SERVICE MODE LIST

This unit is provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter to the Service Mode, press both set key and remote control key for more than 1 second.

Set Key

VOL. (-) MIN

VOL. (-) MIN 1

VOL. (-) MIN

Remocon Key Operations

Releasing of V-CHIP PASSWORD. Initialization of factory data.

NOTE:

POWER ON total hours is displayed on the screen. Refer to the "CONFIRMATION OF HOURS USED".

Can be checked of the INITIAL DATA of MEMORY IC. Refer to the "WHEN REPLACING EEPROM (MEMORY) IC".

Display of the Adjustment MENU on the screen. Refer to the "ELECTRICAL ADJUSTMENT" (On-Screen Display Adjustment).

Do not use this for the normal servicing. If you set a factory initialization, the memories are reset such as the channel setting, and the POWER ON total hours.

CONFIRMATION OF HOURS USED

POWER ON total hours can be checked on the screen. Total hours are displayed in 16 system of notation.

NOTE: If you set a factory initialization, the total hours is reset to "0".

Set the VOLUME to minimum.

Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second.

After the confirmation of using hours, turn off the power.

ADDRESS DATA

INIT 00 50 CRT ON 0010

FIG. 1

Initial setting content of MEMORY IC. POWER ON total hours.

= (16 x 16 x 16 x thousands digit value) + (16 x 16 x hundreds digit value) + (16 x tens digit value) + (ones digit value)

C-1 20AF46/20AF46C

WHEN REPLACING EEPROM (MEMORY) IC

If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1.

NOTE: No need setting for after INI 5F due to the adjustment value.

INI

+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F 50 E8 0A 45 5E B3 24 B5 *1 AC

00 0B 84 40 40 40 7F

50 00 00 03 00 00 00 3F 0F10 00 0D E2 94 88 3F 00 01 07 09 0B 0D 0F 10 11 1220 04 13 14 15 16 17 18

18 19 1A 1A 1B 1B 1B 1C 1C30 19 1C 1D 1D 1E 1E 1F

1F 20 20 20 21 21 21 22 2240 1F 23 23 24 24 25 25

26 27 27 28 28 29 29 2A 2A50 26 2B 2B 2C 2C 2D 2D

Table 1

Enter DATA SET mode by setting VOLUME to minimum.

Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 1 second. ADDRESS and DATA should appear as FIG 1.

ADDRESS is now selected and should "blink". Using the VOL. UP/DOWN button on the remote, step through the ADDRESS until required ADDRESS to be changed is reached.

Press ENTER to select DATA. When DATA is selected, it will "blink".

Again, step through the DATA using VOL. UP/DOWN button until required DATA value has been selected.

Pressing ENTER will take you back to ADDRESS for further selection if necessary.

Repeat steps 3 to 6 until all data has been checked.

When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.

After the data input, set to the initializing of shipping.

Turn POWER on.

10.

Press both VOL. DOWN button on the set and Channel button (1) on the remote control for more than 1 second.

11.

After the finishing of the initializing of shipping, the unit will turn off automatically.

The unit will now have the correct DATA for the new MEMORY IC.

INI

USA CANADA

3B 3A

C-2 20AF46/20AF46C

+ 43 hidden pages