TOSHIBA 32Z17B Service Manual

FILE NO. 030-200102
SERVICE MANUAL
COLOUR TELEVISION
C00S Chassis
32Z17B
PRINTED IN JAPAN Mar., 2001 F
CHAPTER 1 GENERAL ADJUSTMENTS
SAFETY INSTRUCTIONS ........................................................................................................................................3
SET-UP ADJUSTMENT ............................................................................................................................................ 4
SERVICE MODE ...................................................................................................................................................... 6
DESIGN MODE ........................................................................................................................................................ 9
ELECTRICAL ADJUSTMENTS .............................................................................................................................. 10
CIRCUIT CHECK .................................................................................................................................................... 17
GENERAL ADJUSTMENTS
CHAPTER 2 SPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA ............................................................................................................................. 18
LOCATION OF CONTROLS ................................................................................................................................... 19
CIRCUIT BLOCK DIAGRAM .................................................................................................................................. 21
CHASSIS AND CABINET REPLACEMENT PARTS LIST ......................................................................................22
PC BOARDS BOTTOM VIEW................................................................................................................................. 35
TERMINAL VIEW OF TRANSISTORS ................................................................................................................... 45
SPECIFICATIONS .................................................................................................................................................. 47

TABLE OF CONTENTS

SPECIFIC INFORMATIONS
APPENDIX:
CIRCUIT DIAGRAM
– 2 –

CHAPTER 1 GENERAL ADJUSTMENTS

SAFETY INSTRUCTIONS

WARNING: BEFORE SERVICING THIS CHASSIS, READ THE X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU-
TION AND PRODUCT SAFETY NOTICE INSTRUCTIONS BELOW.
X-RAY RADIATION PRECAUTION
1. Excessive high voltage can produce potentially hazard­ous X-RAY RADIATION. To avoid such hazards, the high voltage must not be above the specified limit. The nominal value of the high voltage of this receiver is (A) kV at zero beam current (minimum brightness) under a (C) V AC power source. The high voltage must not, under any circumstances, exceed (B) kV.
Refer to table-1 for high voltage (A), (B) & AC voltage (C). (See SETTING & ADJUSTING DATA on page 18)
Each time a receiver requires servicing, the high voltage should be checked following the HIGH VOLTAGE CHECK procedure in this manual. It is recommended that the read­ing of the high voltage be recorded as a part of the service record. It is important to use an accurate and reliable high voltage meter.
2. The only source of X-RAY RADIATION in this TV receiver is the picture tube. For continued X-RAY RADIATION pro­tection, the replacement tube must be exactly the same type tube as specified in the parts list.
3. Some part in this receiver have special safety-related char­acteristics for X-RAY RADIATION protection. For contin­ued safety, parts replacement should be undertaken only after referring to the PRODUCT SAFETY NOTICE below.
GENERAL ADJUSTMENTS
SAFETY PRECAUTION
WARNING : Service should not be attempted by anyone unfamiliar with the necessary precautions on this receiver. The following are the necessary precautions to be observed before servicing this chassis.
1. An isolation transformer should be connected in the power line between the receiver and the AC line before any service is performed on the receiver.
2. Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube. The picture tube is highly evacuated and if broken, glass fragments will be violently expelled. Use shatter proof goggles and keep picture tube away from the unprotected body while handling.
3. When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place, such as; non­metallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc.
PRODUCT SAFETY NOTICE
SPECIFIC INFORMATIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety char­acteristics are identified in this manual and its supplements; electrical components having such features are identified by the international hazard symbols on the schematic diagram and the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock, fire, X-ray radiation or other hazards.
– 3 –
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, SAFETY PRECAU- TION AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL.
The following adjustments should be made when a complete realignment is required or a new picture tube is installed. Perform the adjustments in order as follows :
1. Color Purity
2. Convergence
3. White Balance
Note: The PURITY/CONVERGENCE MAGNET assembly and rubber wedges need mechanical positioning.
Refer to figure 1.
GENERAL ADJUSTMENTS
*
COLOR PURITY ADJUSTMENT NOTE : Before attempting any purity adjustments, the receiver
1. Demagnetize the picture tube and cabinet using a degauss-
2. Set the brightness and contrast to maximum.
3. Use a green raster from among the built-in test signals.
4. Loosen the clamp screw holding the yoke and slide the
Mounting position of the purity magnet assembly should fit to same position as old one because slightly difference to the position depend on a kind of tube.
There are no adjustment of purity and convergence in some picture tube (Unified with purity magnet)
should be operated for at least fifteen minutes.
ing coil.
yoke backward or forward to provide vertical green belt (zone) in the picture screen.
SPECIFIC INFORMATIONS

SET-UP ADJUSTMENT

5. Remove the Rubber Wedges.
6. Rotate and spread the tabs of the purity magnet (See fig­ure 2.) around the neck of the picture tube until the green belt is in the center of the screen. At the same time, enter the raster vertically.
7. Slowly move the yoke forward or backward until a uniform green screen is obtained. Tighten the clamp screw of the yoke temporarily.
8. Check the purity of the red and blue raster.
GLASS CLOTH TAPES
DEFLECTION YOKE
29.1mm(28", 29") 25mm(25") 19mm(19", 20", 21") 14mm(13", 14")
PURITY/ CONVERGENCE MAGNET ASS'Y
Figure 1.
TEMPORARY MOUNTING
RUBBER WEDGE
ADHESIVE
DEFLECTION YOKE
– 4 –
CONVERGENCE ADJUSTMENTS
NOTE: Before attempting any convergence adjustments, the
receiver should be operated for at least fifteen min­utes.
CENTER CONVERGENCE ADJUSTMENT
1. Use the cross-dot pattern from among the built-in test sig­nals.
2. Set the brightness and contrast for well defined pattern.
3. Adjust two tabs of the 4-Pole Magnets to change the an­gle between them (See figure 2.) and superimpose red and blue vertical lines in the center area of the picture screen.
4. Turn the both tabs at the same time keeping the angle constant to superimpose red and blue horizontal lines at the center of the screen.
5. Adjust two tabs of 6-Pole Magnets to superimpose red/ blue line and green one. Adjusting the angle affects the vertical lines and rotating both magnets affects the hori­zontal lines.
6. Repeat adjustments 3, 4, 5 keeping in mind red, green and blue movement, because 4-Pole Magnets and 6-Pole Magnets have mutual interaction and make dot movement complex.
6-POLE
4-POLE
MAGNETS
MAGNETS
ADJUST THE ANGLE (VERTICAL LINES)
CIRCUMFERENCE CONVERGENCE ADJUSTMENT
1. Loosen the clamping screw of deflection yoke slightly to allow the yoke to tilt.
2. Temporarily put a wedge as shown in figure 1. (Do not remove cover paper on adhesive part of the wedge.)
3. Tilt front of the deflection yoke up or down to obtain better convergence in circumference. (See figure 3.) Push the mounted wedge into the space between picture tube and the yoke to fix the yoke temporarily.
4. Put other wedge into bottom space and remove the cover paper to stick.
5. Tilt front of the yoke right or left to obtain better conver­gence in circumference. (See figure 3.)
6. Keep the yoke position and put another wedge in either upper space. Remove cover paper and stick the wedge on picture tube to fix the yoke.
7. Detach the temporarily mounted wedge and put it in an­other upper space. Stick it on picture tube to fix the yoke.
8. After fixing three wedges, recheck overall convergence. Tighten the screw firmly to fix the yoke and check the yoke is firm.
9. Stick three adhesive tapes on wedges as shown in figure
1.
FIXED
GENERAL ADJUSTMENTS
ROTATE TWO TABS AT THE SAME TIME (HORIZONTAL LINES)
PURITY MAGNETS
CONVERGENCE MAGNET ASSEMBLY ADJUSTMENT OF MAGNETS
Figure 2.
BLU RED
BLU
RED
4-POLE MAGNETS MOVEMENT
BGR
R G B
RGB
RED/BLU
GRN
Center Convergence by Convergence Magnets
B G R
RED/BLU GRN
6-POLE MAGNETS MOVEMENT
B G R
BGR
RGB
R G B
SPECIFIC INFORMATIONS
INCLINE THE YOKE UP (OR DOWN)
Circumference Convergence by DEF Yoke
Figure 3. Dot Movement Pattern
INCLINE THE YOKE RIGHT (OR LEFT)
– 5 –
1. ENTERING TO SERVICE MODE
1) Press o button once on
Remote Control.

SERVICE MODE

2) Press o button again to
keep pressing.
3) While pressing the o button,
press MENU button on TV set.
Mute or
GENERAL ADJUSTMENTS
2. DISPLAYING THE ADJUSTMENT MENU
1) Press MENU button on TV.
Adjustment mode
ITEM
DATA
3. KEY FUNCTION IN THE SERVICE MODE
The following key entry during display of adjustment menu provides special functions.
SPECIFIC INFORMATIONS
A single horizontal line ON/OFF: INFO button (on Remote) or a button (on TV) Test signal selection : a button (on Remote) Selection of the adjustment items : Channel s/t (on TV or Remote) Change of the data value : Volume ; +/– (on TV or Remote) Adjustment menu mode ON/OFF : MENU button (on TV) Initialization of the memory (QA02) : CALL + Channel button on TV (s) Reset the count of operating protect
circuit to “00”: CALL + Channel button on TV (t)
RCUT selection : 1 buttonGCUT selection : 2 buttonBCUT selection : 3 buttonCNTX (or SCNT) selection : 4 buttonCOLC selection : 5 buttonTNTC selection : 6 button
Self diagnostic display ON/OFF : 9 button
Item
Data
Press
Press
Item
Data
(Service mode display)
Service mode
S
S
Color thickness correction note: Displayed differently as shown below, de-
pending on the setting of the receiving color system. COLP (PAL) COLC (NTSC) COLS (SECAM)
CAUTION : Never try to perform initialization unless you have changed the memory IC.
– 6 –
4. SELECTING THE ADJUSTING ITEMS
1) Every pressing of CHANNEL s button in the service mode changes the adjustment items in the order of table-2. (t button for reverse order)
Refer to table-2 for preset data of adjustment mode. (See SETTING & ADJUSTING DATA on page 18)
5. ADJUSTING THE DATA
1) Pressing of VOLUME ; +/– button will change the value of data in the range from 00H to FFH. The variable
range depends on the adjusting item.
6. EXIT FROM SERVICE MODE
1) Pressing POWER button to turn off the TV once.
INITIALIZATION OF MEMORY DATA OF QA02
After replacing QA02, the following initialization is required.
1. Enter the service mode, then select any register item.
2. Press and hold the CALL button on the Remote, then press the CHANNEL s button on the TV. The initialization of QA02 has
been complated.
3. Check the picture carefully. If necessary, adjust any adjustment item above. Perform Auto search Memory” on the owner’s manual.
CAUTION: Never attempt to initialize the data unless QA02 has been replaced.
7. TEST SIGNAL SELECTION
1) Every pressing of a button on the Remote Control changes the built-in test patterns on screen as described below
in SERVICE MODE.
GENERAL ADJUSTMENTS
Signal off
The signals marked with are not usable to display in the Test signal for some model.
*
NTSC signals (5 patterns)
PAL signals (5 patterns)
Red raster
Green raster
Blue raster
All White
Black cross-hatch
Signals Picture
SPECIFIC INFORMATIONS
7
8. SELF DIAGNOSTIC FUNCTION
1) Press “9” button on Remote Control during display of adjustment menu in the service mode. The diagnosis will begin to check if interface among IC’s are executed properly.
2) During diagnosis, the following displays are shown.
<SELF CHECK>
23******
POWER : 00
BUS LINE : OK
BUS CONT : OK
BLOCK :
GENERAL ADJUSTMENTS
UV V1 V2 V3 QV01
Indicated color of mode now selected : Green and Red Indicated color of other modes : White
Green : Normal Red : The microcomputer operates to provide judgement
of no video signal. The red color is still indicated though the signal is input, failure may exist in input signal line including QV01.
QV01 : In case of indication green ---Normal
In case of indication red with input signal---­Failure may exist in output line including QV01.
Part number of microcomputer (QA01)Operation number of protecting circuit ----00 is nor-
mal. When indication is other than “00”, overcurrent apts to flow, and circuit parts may possibly be damaged.
BUS LINE CHECK ----OK is normal.
SDA1-GND ------------- SDA-GND short circuit.SCL1-GND -------------- SCL-GND short circuit.SCL1-SDA1 ------------- SCL-SDA short circuit.
BUS CONT ----“OK is normal.
When indication shows Q uuu NG, the device with
SPECIFIC INFORMATIONS
the number may possibly be damaged.
BLOCK
UV : TV reception mode V1 : VIDEO 1 input mode (a1) V2 : VIDEO 2 input mode (a2) V3 : VIDEO 3 input mode (a3)
The items marked with are not usable to display in the SELF DIAGNOSTIC FUCTION for some model.
*
NOTE: Component which controls character display on
screen is ICF01 (QT01) (TELETEXT IC.). If this display function fails to operate due to damage in ICF01 (QT01), self diagnosis procedure is as fol­lows. (1) In case that power indicator is blinking with
interval of 0.5 seconds; it means protecting circuit (Current limiter) is operating, and cir­cuit components may possibly be damaged. Check related components.
(2) In case that power indicator is blinking with
interval of 1 second; Protecting circuit does not operate, but a part of Bus line does not operate normally. Check Bus line.
– 8 –
1. ENTERING TO DESIGN MODE
1) Select the Service mode.

DESIGN MODE

2) While pressing o or CALL button on
Remote and press MENU button on TV.
3) Press MENU button on TV.
S D
(Design mode) (Adjustment mode)
When QA02 is initialized, items “OPT0” and “OPT1” of DESIGN MODE are set to the data of the representative model of this chassis family. Therefore, because ON-SCREEN specification remains in the state of the representative of model. This model is required to reset the data of items “OPT0” and “OPT1”.
2. SELECTING THE ADJUSTING ITEMS
Every pressing of CHANNEL t button in the design mode changes the adjustment items in the order of table-3. (s button for reverse order)
Refer to table-3 for data of design mode. (See SETTING & ADJUSTING DATA on page 18)
3. ADJUSTING THE DATA
Pressing of VOLUME s or t button will change the value of data.
Press
Press
ITEM
DATA
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
9

ELECTRICAL ADJUSTMENTS

ITEM ADJUSTMENT PROCEDURE
FOCUS VR ADJ
SUB-BRIGHTNESS (BRTC)
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
Note: Constrict the picture height
until the vertical retrace line appears adjusting the item HIT (HEIGHT).
HORIZONTAL POSITION ADJUSTMENT (HPOS)
VERTICAL POSITION ADJUSTMENT (VPOS)
1. Enter the service mode, then select any register item.
2. Press the TV/VIDEO button on the Remote until the black cross-bar pattern ap­pears on the screen.
3. Adjust the FOCUS control (on T461) for well defined scanning lines on the picture screen.
1. Set CONTRAST to minimum, and BRIGHTNESS to center by adjusting user controls.
2. Set the TV in service mode to get white cross-bar of inside pattern.
3. Select BRTC (brightness correction), and adjust the ; – /+ button to reduce the value so that white portion of inside pattern slightly light.
4. Adjust ; – /+ button to increase the data value of BRTC, and set it just before the difference between the belt of vertical retrace and the border of black portion of inside pattern is visible. After that, return vertical height and contrast.
1. Set the TV in service mode, and get black or white cross-bar signal with VIDEO button on remote hand unit.
2. Select either HPOS (Horizontal picture phase) or VPOS (Vertical picture phase) with CHANNEL s, t buttons, and adjust horizontal or vertical picture position in the center of screen with VOLUME ; – /+ buttons.
Belt of vertical retrace
VERTICAL AMPLITUDE ADJUSTMENT (HIT)
1. Set the TV in service mode, and get black or white cross-hatch signal with VIDEO button on remote hand unit.
2. Select HIT (Vertical amplitude) with CHANNEL s, t buttons, and adjust vertical amplitude with VOLUME ; – /+ buttons so that vertical am- plitude lacks a little.
3. Adjust vertical amplitude with VOL­UME ; – /+ buttons so that the first bar on cross-hatch signal touches edge of screen.
– 10 –
The first
ITEM ADJUSTMENT PROCEDURE
WHITE BALANCE ADJUSTMENT
CUTOFF ADJUSTMENT
(RCUT) (GCUT) (BCUT)
DRIVE ADJUSTMENT
(GDRV) (BDRV)
1. Set Contrast to 40, and brightness to +20 by picture control.
2. Set the TV in service mode, and get the inside W/B adjusting signal with VIDEO button.
3. Select RCUT, GCUT and BCUT with CHANNEL s, t buttons, to set individual values to Initial reference data, and to set GDRV and BDRV to Initial reference data with VOLUME ; – /+ buttons (See page 18).
4. Press -/- - button on the remote control and rotate Screen VR to get one slight horizontal line on screen. Note: Every pressing of -/- - button provides Horizontal line picture and Normal picture alternately.
5. Press -/- - button to release horizontal line picture, and select the two other colors which did not light in the above step with CHANNEL s, t buttons. Then tap VOL- UME ; – /+ buttons so that three colors slightly light in the same level.
X To correct white balance in light area,
select GDRV and BDRV with CHANNEL s, t buttons to adjust.
X To correct white balance in dark area,
perform fine adjustment of RCUT, GCUT and BCUT.
Light area check
(to show white)
Dark area check
(to show black)
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
– 11 –
)
2
)
2
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
2.4 ± 0.1 Vp-p 4±1.5 pieces
level to the white peak.
Adjust the amplitude from the pedestal
Adjust the number of collapsed black lines
TP46B
Screen adjust-
1.2 ± 0.1 Vo-p Bright part
Screen adjustment
(103cd/m
of the sub-bright signal.
(Be sure to apply Y mute during adjustment)
To adjust after W/B, [SCNT] adjustment.
Adjust the amplitude of B-Y.
Enter Horizontal Straight-line Mode.
Gradually increase the screen VR until R,
TP46B
ment
Screen adjustment
8750K-0.002uv
Dark part
(17cd/m
8750K-0.002uv
G, or B line starts to light up slightly.
sition here.
Determine the screen VR adjustment po-
Gradually increase remaining two screen
Screen judgment
(CA100)
line starts to light up slightly. (Adjust until
VRs – except the line that lit up as men-
the screen becomes almost white.)
tioned in item above – until respective
correct value is set to both the dark and
bright parts.
Exit from Horizontal Straight-line Mode.
Using CA100, repeat this adjustment until
Input signals Measuring points Adjusting methods Adjusting standards
Settings
(User control)
Items Names
(Reference Factory Adjustments)
Sub-bright signal
(PAL-I Signal)
Sub-bright Signal
Picture MODE-1
Screen size: WIDE
Audio system: I
Picture MODE-1
Screen size: WIDE
Sub-contrast
[SCNT]
Sub-bright
[BRTC]
Center
Sub-bright Signal
(PAL)
Picture MODE-1
Screen size: WIDE
Picture MODE-1
Screen size: WIDE
[RCUT]: 40H
Sub-color center
PA L
R Cutoff
G Cutoff
B Cutoff
[COLP]
SCREEN
VR
[RCUT]
– 12 –
[GCUT]: 40H
[BCUT]: 40H
[GDRV]: 35H
[BDRV]: 35H
G Drive
B Drive
[GCUT]
[BCUT]
[GDRV]
[BDRV]
0 ± 10 mV
0 ± 10 mV
1.6 ± 0.1 Vo-p
(Pedestal to Peak)
GENERAL ADJUSTMENTS
chrome signal part aligns with that of BLK.
Vary [SBY] so that the level of mono-
TP01
Input signals Measuring points Adjusting methods Adjusting standards
SECAM Color bar
Settings
(User control)
chrome signal part aligns with that of BLK.
Vary [SRY] so that the level of mono-
TP02
SECAM Color bar
(Be sure to apply Y mute during adjust-
ment)
Adjust the amplitude of B-Y.
TP46B
SECAM Color bar
SPECIFIC INFORMATIONS
Items Names
SECAM
B-Y Black
level
[SBY]
– 13 –
SECAM
R-Y Black
level
[SRY]
Picture MODE-1
Screen size: WIDE
Sub-color
Center
SECAM
[COLS]
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
Contact point
during WIDE
mode
Contact point
during Super-
live mode
Contact point
during CIN-
EMA mode
Black
Yellow Red Yellow
PAL WG Phillips Pattern, User adjustment standard
Adjust the vertical amplitude by [HIT] so that both upper and
Adjusting items Adjusting methods
WIDE mode
Vertical amplitude [HIT]
1. Data adjustment
Vertical
lower flags will disappear from the screen.
PAL Phillips Pattern, User adjustment standard
Adjust the vertical position [VPS1] with Phillips Pattern so
that the vertical screen position will come to the center (see
the right sketch).
PAL Phillips Pattern, User adjustment standard
Adjust the vertical amplitude by [HIT] so that the top and
bottom of the circle will touch the CPT mask with Philips
Pattern (see the right sketch).
Vertical position [VPS1]
Super-live mode
Vertical amplitude [HIT]
Phillips Pattern, User adjustment standard
Adjust the vertical amplitude by [HIT] so that the points
shown in the right bottom sketch will touch the CRT mask
(see the right sketch).
CINEMA mode
Vertical amplitude [HIT]
– 14 –
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