Toshiba 21S23B2 Schematic

TOSHIBA

SERVICE MANUAL

COLOUR TELEVISION

21S23B2

PRINTED IN UK. 2002 C

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

Earphone 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

Inferior silicon grease can damage IC's and transistors. When replacing an IC's or transistors, use only specified silicon grease (YG6260M). Remove all old silicon before applying new silicon.

A1-1

CONTENTS

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

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

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

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/TUNER.......................................................................................................................................

IF/CHROMA............................................................................................................................................

21PIN ......................................................................................................................................................

STEREO .................................................................................................................................................

SOUND AMP ..........................................................................................................................................

DEFLECTION/CRT .................................................................................................................................

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

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

MECHANICAL EXPLODED VIEW ..............................................................................................................

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

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

A1-1 A1-1 A1-1 A2-1 A3-1~A3-5

B1-1 B2-1, B2-2 C-1 C-1 C-1 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 H-1~ H-4 I-1 J1-1 J2-1~ J2-9

A2-1

GENERAL SPECIFICATIONS

G-1 TV CRT CRT Size / Visual Size 21 inch / 544.5mmV

G-2 Tuning Broadcasting System U.K. System I

G-3 Power Power Source AC 230V-240V AC 50Hz

G-4 Regulation Safety CE(EN60065:98),BEAB

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

G-6 Operating Humidity Less than 80% RH

System CRT Type NORMAL

Deflection 90 degree

Magnetic Field BV/BH +0.45G/0.18G Color System PAL Speaker 2 Speaker

Position Front

Size 2.0 x4.7 Inch

Impedance 8 ohm Sound Output MAX 5.0+5.0 W

10%(Typical) 4.0+4.0 W DDR SECAM No NTSC3.58(AV)+NTSC4.43 Yes PAL60Hz Yes

System Tuner and System 1Tuner

Receive CH Destination UK

Tuning System F-Synth

Input Impedance VHF/UHF 75 ohm

21 - 69

CH Coverage Intermediate Picture(FP) 39.5MHz Frequency Sound(FS) 33.5MHz

FP-FS 6.0MHz Preset CH 100 Stereo/Dual TV Sound Yes Tuner Sound Muting Yes

DC Power Consumption at AC

60 W at AC 230 V 50 Hz Stand by (at AC) 3 W at AC 230 V 50 Hz Per Year -- kWh/Year

Protector Power Fuse Yes

Radiation CE X-Radiation -

Storage -20oC ~ +60oC

A3-1

GENERAL SPECIFICATIONS

G-7 On Screen Menu Yes

G-8 OSD Language English French Spanish

G-9 Clock and Sleep Timer Max Time - Min

Display Menu Type Character

Picture Yes

Contrast Yes Brightness Yes Colour Yes Tint (NTSC Only) Yes Sharpness Yes

Audio Yes

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

CH Tuning Yes

Manual Yes Auto Yes CH MAPPING Yes CH Allocation No

Language Yes Clock Set No On/OffTimer Set Yes On Timer Set No Pin Code Registration No Panel Lock Yes Nicam Auto Off Yes AV Colour System Yes Sound System No Auto 4:3 Default No AV2 Output Yes

Output Source Yes Source Yes

Control Level Yes

Volume Yes Brightness Yes Contrast Yes Colour Yes Tint (NTSC Only) Yes Sharpness Yes Tuning Yes Bass Yes Treble Yes Balance Yes Back Light No

Nicam ST Yes Tone 1/2 (A/B) Yes Surround On/Off No Pin Code No AV Yes Skip Yes Channel Yes Broadcasting Station Name Yes Hotel Lock No Sleep Timer No Selectable Picture Yes Wide Mode No Sound Mute Yes

Germany Italian

Timer Step - Min

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

A3-2

GENERAL SPECIFICATIONS

G-10 Remote Unit RC-GX

Control Glow in Dark Remocon No

Format NEC Custom Code 40-BF h Power Source Voltage(D.C) 3V

UM size x pcs UM-4 x 2 pcs

Total Keys 34 Keys Keys Power Yes

1/Rename Yes 2/Move Yes 3 Yes 4 Yes 5 Yes 6 Yes 7 Yes 8 Yes 9 Yes 0 Yes Volume Up / + Yes Volume Down / - Yes Previous Yes Select Picture Yes Menu Yes OK(Enter) Yes EXIT Yes Audio Select Yes On/OffTimer No Mute Yes DSP/surround/Virtual Dolby No Woofer/Bass No Picture Size No

T'TEXT Keys TEXT / MIX / TV Yes

CH Up / Page Up Yes CH Down / Page Down Yes Red Yes Green Yes Yellow Yes Cyan Yes TEXT F/T/B Yes Reveal Yes TIMED PAGE(SUB PAGE) Yes CALL / TEXT INDEX Yes INPUT SELECT Yes TEXT HOLD Yes TIME / TXCL Yes

A3-3

GENERAL SPECIFICATIONS

G-11 Features Auto Degauss Yes

Auto Shut Off Yes Canal+ No CATV No Anti-theft(Back Up 30 Min.) No Memory(Last CH) Yes Memory(Last Volume) Yes BBE No Auto Search Yes CH Allocation No CH MAPPING Yes Just Clock Function No Game Position No CH Label No VM Circuit No Full OSD No Noise Blue Back Yes T'Text Yes

Text type Fastext Text Language English, French, Swedish, Hungarian

Finnish, Turkish, German, Dutch

Portuguese, Spanish, Italian, Greek

Premiere No Comb Filter No

Lines

Auto CH Memory No Stable Sound No Auto Set Up Yes FBT Leak Test Protect Yes Previous (Quick View) Yes Panel Lock Yes Power ON Memory Yes Double Focus & Dynamic Focus No Wss Signal Wide Change No Virtual Dolby Surround No Hotel Lock No

G-12 Accessories Owner's Manual Language English

w/Guarantee Card

Remote Control Unit Yes Rod Antenna

Poles Pole Terminal type

Loop Antenna

Terminal -

U/V Mixer DC Car Cord (Center+) Guarantee Card Warning Sheet Circuit Diagram Antenna Change Plug Service Facility List Important Safeguard Yes (Owner's Manual In) Dew/AHC Caution Sheet AC Plug Adapter Quick Set-up Sheet Yes Battery Yes

UM size x pcs UM-4 x 2 pcs OEM Brand No

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

No No No No No No No

No No

No No No No No

A3-4

GENERAL SPECIFICATIONS

Surfaces

G-13 Interface Switch Front Power (Tact Sw) No

Rear AC/DC No

Indicator Power No

Terminals Front Video Input

Rear Video Input(Rear1)

G-14 Set Size Approx. W x D x H (mm) 590 x 492 x 446.5 G-15 Weight Net (Approx.) 21.0 kg

G-16 Carton Master Carton No

Gift Box Yes

Drop Test

Container Stuffing 288

G-17 Material Cabinet Front PS 94HB

PCB Non-Halogen Demand Yes

G-18 Environment Pb Free Lead-free Solder No

Cd Free No

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

TV/CATV Selector No Degauss No Main Power SW No

Stand-by No Stand-by/ON Yes(Red) On Timer Yes(Green)

Audio Input Other Terminal

Video Input(Rear2) Audio Input(Rear1) Audio Input(Rear2) Video Output Audio Output Euro Scart(21Pin) Yes ( x1 ) S-INPUT Yes ( x1 ) Euro Scart(21Pin) Yes ( x1 ) RGB-INPUT Yes ( x1 ) Component Input Diversity No Ext Speaker No DC Jack 12V(Center +) No VHF/UHF Antenna Input AC Outlet No

Gross (Approx.) 23.8kg

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

Material Double/Brown Dimensions W x D x H(mm) 658 x 575 x 529 Design As per Buyer's Description of Origin

Height (cm) 46

Rear PS 94HB Holder PS 94V0 NON-Decabrom

Eyelet Demand Yes

Other No

RCA

RCA x 2(Stereo)

HeadPhone (Stereo)

D Type

Natural Dropping At 1 Corner / 3 Edges / 6

No No No No No No

( --- lbs) ( ---lbs)

No (Assembled in U.K.)

Sets/40' container

A3-5

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.

Fig. 1-5

B1-1

DISASSEMBLY INSTRUCTIONS

REMOVAL AND INSTALLATION OF FLAT PACKAGE IC

REMOVAL

Put the Masking Tape (cotton tape) around the Flat

1. Package 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 add the rotating and the back and forth directions force on the IC, until IC can move back and forth easily after desoldering the IC 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

DISASSEMBLY INSTRUCTIONS

INSTALLATION

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

1. new 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

Solder temporarily

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

Fig. 2-5

When bridge-soldering between terminals and/or the

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

Thin-tip Soldering Iron

Fig. 2-8

Finally, confirm the soldering status on four sides of the

5. IC 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, be always sure to replace the IC in this case.

Soldering IronSolder

Absorb the solder left on the lead using the Braided

Supply soldering from upper position to lower position

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

NOTE

Do not absorb the solder to excess.

Soldering Iron

Braided Shield Wire

Fig. 2-6

Fig. 2-7

B2-2

SERVICE MODE LIST

This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter the Service Mode, press both set key and remote control key for more than 2 seconds.

Set Key

VOL. (-) MIN 0

VOL. (-) MIN 1

VOL. (-) MIN

Remocon Key Operations

Reset the user setting items (PICTURE, VOLUME and LANGUAGE) to the initial state for delivery.

Initialization of the factory. 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". Writing of EEPROM initial data.

NOTE: Do not use this for the normal servicing. 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 2 seconds.

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

ADDRESS DATA

INIT 01 00 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)

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 16 due to the adjustment value.

INI

+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F

--10 00

Enter DATA SET mode by setting VOLUME to minimum.

1. Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 2 seconds.

2. ADDRESS and DATA should appear as FIG 1. ADDRESS is now selected and should "blink". Using the VOL. +/- button on the remote, step through the ADDRESS until

3. required ADDRESS to be changed is reached. Press OK to select DATA. When DATA is selected, it will "blink".

4. Again, step through the DATA using VOL. +/- button until required DATA value has been selected.

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

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

7. 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.

9. Press both VOL. DOWN button on the set and Channel button (1) on the remote control for more than 2 seconds.

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

11.

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

23 18 31 86 40 68 5A 27 07 83 00 06 7300 38

90 90 3C 4090

--- --- --- --- --- --- --- --- ---

Table 1

C-1

ELECTRICAL ADJUSTMENTS

1. ADJUSTMENT PROCEDURE

Read and perform these adjustments when repairing the circuits or replacing electrical parts or PCB assemblies.

CAUTION

•

Use an isolation transformer when performing any service on this chassis.

•

Before removing the anode cap, discharge electricity because it contains high voltage.

•

When removing a PCB or related component, after unfastening or changing a wire, be sure to put the wire back in its original position.

•

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

Prepare the following measurement tools for electrical adjustments.

1. Oscilloscope

2. Digital Voltmeter

3. Pattern Generator

On-Screen Display Adjustment

1. In the condition of NO indication on the screen.

Press the VOL. DOWN button on the set and the Channel button (9) on the remote control for more than 2 seconds to appear the adjustment mode on the screen as shown in Fig. 1-1.

2. BASIC ADJUSTMENTS

2-1: CONSTANT VOLTAGE

Place the set with Aging Test for more than 15 minutes.

1. Connect the digital voltmeter to TP501.

2. Set condition is AV MODE without signal.

3. Adjust the VR501 until the DC voltage is 117 ± 1V.

2-2: VCO

Place the set with Aging Test for more than 10 minutes.

Connect the oscillator (39.5MHz) to TP001.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (13) on the remote control to select "VCO COARSE".

Press the VOL. +/- button on the remote control until the "OK" appear on the screen. If the "OK" is not displayed, select the "+" side on the changed from "+" to "-".

Press the Page UP button once to set to "VCO FINE" mode.

Press the VOL. +/- button on the remote control to select the 4 step down point from the upper limit on the "OK". (Example: In case of the "OK" range 30~41, select 37.)

2-3: AGC VOLTAGE

Place the set with Aging Test for more than 15 minutes.

Receive the UHF (63dB).

Connect the digital voltmeter to pin 5 of CP101.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (01) on the remote control to select "RF AGC".

Press the VOL. +/- button on the remote control until the digital voltmeter is 2.4 ± 0.05V.

35 H POSI OSD 36 V POSI OSD 37 H POSI TEXT 38 V POSI TEXT 39 H POSI 60 00 CUT OFF

9- EXT

120 119

57 57

VCO Status MMM

Fig. 1-1

2.3.Use the Channel button (0-9) or Channel UP/DOWN button on the remote control to select the options shown in Fig. 1-2. Press the MENU button on the remote control to end the adjustments.

FUNCTION

NO.

CUT OFF

RF AGC

AGC GAIN

R DRIVE

R CUTOFF

G DRIVE

G CUTOFF

B DRIVE

H POSI (50)

V POSI (50)

V POSI (60)

V SIZE (50)

V SIZE (60)

VCO COARSE

VCO FINE

VCO COARSE L1

VCO FINE L1

BRIGHT CENT

BRIGHT MAX

BRIGHT MIN

NO.

FUNCTION

TINT

SHARP

CONTRAST CENT

CONTRAST MAX

CONTRAST MIN

COLOR CENT

COLOR MAX

COLOR MIN

M R CUT OFF

M G CUT OFF

M B CUT OFF

CVBS OUT

APR THRESHOLD

BELL FILTER

BANDPASS

H POSI OSD

V POSI OSD

H POSI TEXT

V POSI TEXT

H POSI (60)

Fig. 1-2

2-4: CUT OFF

Set condition is AV MODE without signal.

Using the remote control, set the brightness and contrast to normal position.

Place the set with Aging Test for more than 15 minutes.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (00) on the remote control to select "CUT OFF".

Adjust the Screen Volume until a dim raster is obtained.

2-5: WHITE BALANCE NOTE: Adjust after performing CUT OFF adjustment.

Place the set with Aging Test for more than 15 minutes.

Receive the gray scale pattern from the Pattern Generator.

Using the remote control, set the brightness and contrast to normal position.

Activate the adjustment mode display of Fig. 1-1 and press the channel button (03) on the remote control to select "R DRIVE".

Press the Page UP/DOWN button on the remote control to select the "R DRIVE", "G DRIVE", "M R CUTOFF" or "M G CUTOFF".

Adjust the VOL. +/- button on the remote control to whiten the R DRIVE, G DRIVE, M R CUT OFF, and M G CUT OFF at each step tone sections equally.

Perform the above adjustments 5 and 6 until the white color is looked like a white.

D-1

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