Toshiba 27AF62 User manual

TOSHIBA CORPORATION
1-1, SHIBAURA 1- CHOME, MINATO-KU, TOKYO 105-8001, JAPAN
FILE NO. 020-200202
SERVICE MANUAL
COLOR TELEVISION
N2F Chassis
27AF62 , 27AF42
PUBLISHED IN JAPAN, Apr. 2002 So
(TAC0201) (TAC0202)

– 2 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
TABLE OF CONTENTS
CHAPTER 1 GENERAL ADJUSTMENTS
SAFETY INSTRUCTIONS ........................................................................................................................................ 3
SET-UP ADJUSTMENT ............................................................................................................................................ 4
SERVICE MODE ...................................................................................................................................................... 8
DESIGN MODE ...................................................................................................................................................... 11
ELECTRICAL ADJUSTMENT ................................................................................................................................ 12
CIRCUIT CHECKS ................................................................................................................................................. 15
CHAPTER 2 SPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA .............................................................................................................................. 16
LOCATION OF CONTROLS ................................................................................................................................... 17
PROGRAMMING CHANNEL MEMORY ................................................................................................................. 19
CHASSIS AND CABINET REPLACEMENT PARTS LIST ......................................................................................20
PC BOARDS BOTTOM VIEW ................................................................................................................................. 29
TERMINAL VIEW OF TRANSISTORS ................................................................................................................... 35
CIRCUIT BLOCK DIAGRAM .................................................................................................................................. 38
SPECIFICATIONS .............................................................................................................................................. END
APPENDIX:
CIRCUIT DIAGRAM

–3 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
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 120V AC power
source. The high voltage must not, under any circum-
stances, exceed (B) kV.
Refer to table-1 for high voltage (A), (B).
(See SETTING & ADJUSTING DATA on page 16)
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 read-
ing 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. This receiver is equipped with a Fail Safe (FS) circuit which
prevents the receiver from producing an excessively high
voltage even if the B+ voltage increases abnormally. Each
time the receiver is serviced, the FS circuit must be checked
to determine that the circuit is properly functioning, follow-
ing the FS CIRCUIT CHECK procedure in this manual.
3. The only source of X-RAY RADIATION in this TV receiver
is the picture tube. For continued X-RAY RADIATION pro-
tection, the replacement tube must be exactly the same
type tube as specified in the parts list.
4. Some part in this receiver have special safety-related char-
acteristics for X-RAY RADIATION protection. For contin-
ued safety, parts replacement should be undertaken only
after referring to the PRODUCT SAFETY NOTICE below.
SAFETY PRECAUTION
Connect a 1500 ohm 10 watt resistor, paralleled by a 0.15
µF, AC type capacitor, between a known good earth ground
(water pipe, conduit, etc.) and the exposed metallic parts,
one at a time. Measure the AC voltage across the combi-
nation of 1500 ohm resistor and 0.15 µF capacitor. Re-
verse the AC plug at the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Voltage
measured must not exceed 0.3 volts rms.This corresponds
to 0.2 milliamp. AC. Any value exceeding this limit consti-
tutes a potential shock hazard and must be corrected im-
mediately.
WARNING : Service should not be attempted by anyone unfa-
miliar with the necessary precautions on this receiver. The fol-
lowing 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 serv-
ice is performed on the receiver.
2. Always discharge the picture tube anode to the CRT con-
ductive coating before handling the picture tube. The pic-
ture tube is highly evacuated and if broken, glass frag-
ments will be violently expelled. Use shatter proof gog-
gles and keep picture tube away from the unprotected body
while handling.
3. When replacing a chassis in the cabinet, always be cer-
tain that all the protective devices are put back in place,
such as; non-metallic control knobs, insulating covers,
shields, isolation resistor-capacitor network etc.
4. Before returning the set to the customer, always perform
an AC leakage current check on the exposed metallic parts
of the cabinet, such as antennas, terminals, screwheads,
metal overlays, control shafts etc. to be sure the set is
safe to operate without danger of electrical shock. Plug
the AC line cord directly into a 120V AC outlet (do not use
a line isolation transformer during this check). Use an AC
voltmeter having 5000 ohms per volt or more sensitivity in
the following manner:
AC VOLTMETER
0.15µF
Good earth ground
such as a water
pipe, conduit, etc.
Place this probe on
each exposed
metallic part.
1500 ohm
10 watt
PRODUCT SAFETY NOTICE
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 char-
acteristics 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.
CHAPTER 1 GENERAL ADJUSTMENTS

–4 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU-
TION”AND “PRODUCT SAFETY NOTICE”ON PAGE 3 OF THIS MANUAL.
SET-UP ADJUSTMENT (FOR 13”, 14”, 19”, 20”)
■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.
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)
GLASS CLOTH
TAPES
DEFLECTION
YOKE
TEMPORARY
MOUNTING
RUBBER WEDGE
ADHESIVE
DEFLECTION
YOKE
PURITY/
CONVERGENCE
MAGNET ASS'Y
14mm(13", 14")
19mm(19", 20")
Figure 1.
COLOR PURITY ADJUSTMENT
NOTE : Before attempting any purity adjustments, the receiver
should be operated for at least fifteen minutes.
1. Demagnetize the picture tube and cabinet using a degauss-
ing coil.
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
yoke backward or forward to provide vertical green belt
(zone) in the picture screen.
5. Remove the Rubber Wedges.
6. Rotate and spread the tabs of the purity magnet (See fig-
ure 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.

–5 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
CONVERGENCE ADJUSTMENTS
NOTE: Before attempting any convergence adjustments, the
receiver should be operated for at least fifteen min-
utes.
■CENTER CONVERGENCE ADJUSTMENT
1. Use the cross-dot pattern from among the built-in test sig-
nals.
2. Set the brightness and contrast for well defined pattern.
3. Adjust two tabs of the 4-Pole Magnets to change the an-
gle 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 hori-
zontal 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.
■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 conver-
gence 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 an-
other 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.
Figure 2.
BLU RED
BLU
RED
RED/BLU GRN
RED/BLU
GRN
B
G
R
R
G
B
BGR
RGB
BGR
RGB
R
G
B
B
G
R
4-POLE MAGNETS MOVEMENT
INCLINE THE YOKE UP (OR DOWN)
6-POLE MAGNETS MOVEMENT
Center Convergence by Convergence Magnets
Circumference Convergence by DEF Yoke
INCLINE THE YOKE RIGHT (OR LEFT)
Figure 3. Dot Movement Pattern
4-POLE
MAGNETS
PURITY
MAGNETS
6-POLE
MAGNETS
ADJUST THE ANGLE
(VERTICAL LINES) FIXED
ROTATE TWO TABS
AT THE SAME TIME
(HORIZONTAL LINES)
CONVERGENCE MAGNET ASSEMBLY ADJUSTMENT OF MAGNETS

–6 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU-
TION”AND “PRODUCT SAFETY NOTICE”ON PAGE 3 OF THIS MANUAL.
(FOR 35”, 36”)
■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.
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)
COLOR PURITY ADJUSTMENT
NOTE : Before attempting any purity adjustments, the
receiver should be operated for at least fifteen
minutes.
1. Evenly degauss the entire screen.
2. Set the CONTRAST and BRIGHTNESS Controls to
the maximum.
3. Display built-in green raster using the TEST SIGNAL
SELECTION function.
4. Loosen the clamp screw holding the deflection yoke
(and remove the Rubber Wedges).
5. Slide the yoke forward or backward to provide vertical
green belt (zone) in the picture screen.
6. Rotate and spread the tabs of the purity magnet (See
figure 3.) around the neck of the picture tube until the
green belt is in the center of the screen. At the same
time, center the raster vertically by adjusting the mag-
net as shown below.
7. Move the yoke slowly forward or backward until a uni-
form green screen is obtained.Tighten the clamp screw
of the yoke temporarily.
8. Check the purity of the red and blue raster.
9. Put four wedges into the space between the picture
tube and the yoke to hold the yoke in the adjusted
position. (See figure 2.)
Do not tilt the yoke by excessive insertion of the wedge.
10. Remove cover paper of wedge and stick wedges on
the tube to fix the yoke in the adjusted position.
Fix the wedges with glass cloth tapes.
Green Belt
DEFLECTION YOKE
PURITY/
CONV.
MAGNET
Xv Coil
RUBBER WEDGES
DEFLECTION
YOKE
Figure 2.
Figure 1.
1-5/8”
Adhesive

–7 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
CONVERGENCE ADJUSTMENTS
NOTE: Before attempting any convergence adjustments,
the receiver should be operated for at least fifteen
minutes.
■CENTER CONVERGENCE ADJUSTMENT
1. Display built-in cross-dot pattern using the TEST SIG-
NAL SELECTION function.
2. Adjust the BRIGHTNESS and CONTRAST Controls
for well defined pattern.
3. Loosen the tightening ring and adjust two tabs of the
4-Pole Magnets to change the angle between them
(See figure 3.) and superimpose red and blue vertical
lines in the center area of the picture screen.
(See figure 4.)
4. Turn the both tabs at the same time keeping the con-
stant angle to superimpose red and blue horizontal
lines at the centre of the screen. (See figure 4.)
5. Adjust two tabs of 6-Pole Magnets to superimpose red/
blue line with 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 interact and make dot movement com-
plex.
7. After completing the “CENTER CONVERGENCE AD-
JUSTMENT”tighten the tightening ring to fix the mag-
nets.
Figure 4.
■Xv COIL ADJUSTMENT
Adjust the Xv coil (on the deflection yoke) to correct
misconvergence at both sides on screen.
Use a hexagonal tip stick (plastic) to adjust the core of
coil.
BLU
BLU RED
RED
6-POLE MAGNETS
MOVEMENT
4-POLE MAGNETS
MOVEMENT
RED/BLUE
RED/BLUE GRN
GRN
Center Convergence by Convergence Magnets
R
B
B
R
B
R
R
B
Clockwise Adjustment Counterclockwise Adjustment
XvCross Pattern View
■SCREEN-CORNER CONVERGENCE
When the misconvergence is still evident on corners even
though the above adjustment is done, use the ferrite sheet
(Part No. 23993622) to correct misconvergence.
1. Put ferrite sheets into the space under the yoke.
Decide such position that misconvergence becomes
minimum, watching picture screen. (See figure below.)
2. Remove cover paper of ferrite sheet to stick it in the
place on the tube. Put adhesive tapes on ferrite sheets
to fix.
Figure 3.
Ferrite
Sheets
Ferrite
Sheets
For correcting misconvergence
on the position A
A
4-POLE
MAGNETS
6-POLE
MAGNETS
PURITY
MAGNETS
PURITY/CONVERGENCE
MAGNETS
ADJUST THE ANGLE
(VERTICAL LINES) FIXED
ROTATE TWO TABS
AT THE SAME TIME
(HORIZONTAL LINES)
ADJUSTMENT OF MAGNETS
Clockwise Adjustment Counterclockwise Adjustment
XVCross Pattern View

–8 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
SERVICE MODE
1. ENTERING TO SERVICE MODE
MUTE
S
(Service mode display)
3) While pressing the MUTE button,
press MENU button on TV set.
2) Press MUTE button
again to keep pressing.
1) Press MUTE button once
on Remote Control.
2. DISPLAYING THE ADJUSTMENT MENU
1) Press MENU button on TV.
Adjustment mode
Press
Press
Service mode
Item
Data
S
3. KEY FUNCTION IN THE SERVICE MODE
The following key entry during display of adjustment menu provides special functions.
A single horizontal line ON/OFF: TV (ANT)/VIDEO button (on TV)
Test signal selection : TV (ANT)/VIDEO button (on Remote)
Selection of the adjustment items : Channel s/t(on TV or Remote)
Change of the data value : Volume s/t(on TV or Remote)
Adjustment menu mode ON/OFF : MENU button (on TV)
Initialization of the memory (QA02) : RECALL+Channel button on TV (s)
Initialization of the self diagnostic data: RECALL+Channel button on TV (t)
“RCUT”selection : 1 button
“GCUT”selection : 2 button
“BCUT”selection : 3 button
“SCNT”selection : 4 button
“COLC”selection : 5 button
“TNTC”selection : 6 button
Self diagnostic display ON/OFF : 9 button

–9 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
4. SELECTING THE ADJUSTING ITEMS
1)Every pressing of CHANNEL sbutton in the service mode changes the adjustment items in the order of table-2.
(tbutton for reverse order)
Refer to table-2 for preset data of adjustment mode.
(See SETTING & ADJUSTING DATA on page 16)
5. ADJUSTING THE DATA
1) Pressing of VOLUME sor tbutton 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 RECALL button on the Remote, then press the CHANNEL sbutton on the TV. The initialization of QA02
has been complated.
3. Check the picture carefully. If necessary, adjust any adjustment item above.
Perform “Programming Channel 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 TV/VIDEO button on the Remote Control in the Service mode, changes the built-in test patterns
on screen in the following order.
Normal picture Black cross-bar
on green raster
Red raster
H signal (black)
H signal (white)
Green raster
Blue raster
White cross-dot
All black
Black cross-dot
All white
White cross-hatch
Black cross-hatch
White and black
Black cross-bar
White cross-bar
Signals Picture
•Red raster
•Green raster
•Blue raster
•All Black
•All White
•Black & White
•Black cross-hatch
•White cross-hatch
•Black cross-dot
•White cross-dot
•Black cross-bar
•White cross-bar
•Black cross-bar
on green raster
•H signal (white)
•H signal (black)
Note: If the video cable is connected to the VIDEO1 INPUT jack, the
built-in pattern signals are not displayed.
*The signals marked with are not usable to display in the Test signal for some model.

–10 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
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
NO. 23 * * * * * *
POWER : 000
BUS LINE : OK
BUS CONT : OK
BLOCK : UV V1 V2
or QV01 QV01S
SYNC





Part number of microprocessor (QA01)
Operation number of protection circuit (current limiter) . . . . “000”is normal.
BUS line check “OK”................... Normal
“NG”................... SCL-GND
or SAD-GND short circuit
BUS line ACK (acknowledge) check
“OK”..................... Normal
Display of Location Number . . . . NG
(Display example)
“QA02 NG”, “H001 NG”, “Q501 NG”etc.
Note: The indication of failure place is only one place though failure places are plural. When
repair of a failure place finishes, the next failure place is indicated. (The order of priority of
indication is left side.)
Sync. signal check Green display ..... Normal
Cyan display ...... No check
Red display ........ NG
UV ........... TV mode
V1 ............ VIDEO 1 mode
V2 ............ VIDEO 2 mode
*The item marked with are not usable to display in the SELF DIAGNOSTIC FUNCTION for some model.

–11 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
DESIGN MODE
1. ENTERING TO DESIGN MODE
Item
Data
S D Press
(Design mode) (Adjustment mode)
Press
3) Press MENU button on TV.
2) While pressing RECALL button on
Remote and press MENU button on TV.
1) Select the Service mode.
2. SELECTING THE ADJUSTING ITEMS
Every pressing of CHANNEL tbutton in the design mode changes the adjustment items in the order of table-3.
(sbutton for reverse order)
Refer to table-3 for data of design mode.
(See SETTING & ADJUSTING DATA on page 16)
3. ADJUSTING THE DATA
Pressing of VOLUME sor tbutton will change the value of data.
When QA02 is initialized, items “OPT0”and “OPT1”and "OPT2" 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”and "OPT2".

–12 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
ELECTRICAL ADJUSTMENT
Vertical retrace line
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 ap-
pears on the screen.
3. Adjust the FOCUS control (on T461) for well defined scanning lines on the picture
screen.
FOCUS VR ADJ
SUB-BRIGHTNESS
(BRTC)
1. Constrict the picture height until the
vertical retrace line appears adjusting
the HEIGHT control on the MAIN board.
2. Adjust the CONTRAST to the minimum
and BRIGHTNESS to the center.
3. Enter the service mode, then select
“BRTC”register.
4. Adjust the data value so the belt of
vertical retrace line just disappear.
5. Adjust the CONTRAST for the desired
contrast.
6. Adjust the HEIGHT control.
SUB-COLOR
(COLC)
SUB-TINT
(TNTC)
1. Receive color-bar signal from color-bar generator.
2. Press the RESET button.
3. Connect oscilloscope to base of Q906 on CRT-D board.
4. Enter the service mode, then select “COLC”.
5. Adjust the SUB-COLOR by pressing the
VOLUME sor tbutton to achieve about
1V0-p of blue bar.
6. Select “TNTC”register.
7. Adjust the data value to obtain the blue
bar to magenta bar ratio of 3:2 as shown.
8. Select “COLC”register.
9. Adjust the data value to achieve 1.8V0-p
of blue bar on scope.
10. Check the picture with off-air signal.
0
Blue
Magenta
2
3 (1.8V
0-P
)
WIDTH
(WID)
1. Call up the adjustment mode display, then select the item WID.
2. Press the VOLUME sor tbutton to get the picture so the left and right edges of
raster begins to lack.
3. Press the VOLUME sor tbutton to advance the data by 7 steps.
Note : Check the horizontal picture position is correct.
ITEM ADJUSTMENT PROCEDURE
E-W PARABOLA
(DPC)
1. Call up the adjustment mode display, then select the item DPC.
2. Press the TV/VIDEO button on Remote until the cross-hatch pattern appears on
the screen.
3. Press the VOLUME sor tbutton to make vertical lines straight as shown
below.

–13 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
ITEM ADJUSTMENT PROCEDURE
HORIZONTAL POSITION
(HPOS)
VERTICAL POSITION
(VPOS)
1. Call up the adjustment mode display, then select the item HPOS or VPOS.
2. Press the TV/VIDEO button on Remote until the
white cross-bar or black cross-bar pattern appears
on the screen.
3. Adjust the HORIZONTAL and VERTICAL position
alternately by pressing the VOLUME sor tbutton
for proper picture position.
4. Check the picture with off-air signal.
HEIGHT
(HIT)
1. Call up the adjustment mode display, then select the item HIT.
2. Press the VOLUME sor tbutton to get the picture so the top of raster begins
to lack.
3. Press the VOLUME sbutton to advance the data by 9 steps.
Note : Check the vertical picture position is correct.
WHITE BALANCE
(RCUT)
(GCUT)
(BCUT)
(GDRV)
(BDRV)
1. Adjust the CONTRAST control to the center, and BRIGHTNESS control to the
maximum.
2. Call up the adjustment mode display, and press the TV/VIDEO button on
Remote until the white and black pattern appears on the screen.
3. Adjust the following item with the CHANNEL s/tand VOLUME s/tbuttons.
4. Press the TV/VIDEO button on TV to display a single horizontal line on the
screen.
5. Turn the SCREEN control (FBT) fully counterclockwise and gradually rotate
clockwise until the first horizontal line appears slightly on the screen.
6. Press the TV/VIDEO button to display the normal picture.
7. Adjust the remaining two “?CUT”items (CHANNEL s/t→ TV/VIDEO →
VOLUME s/tin order) to obtain the slightly lighted horizontal line in the same
levels of three (red, green, blue) colors. The line should be white if the adjust-
ments are proper.
Bright area
Adjust "GDRV" or "BDRV" to be white.
Dark area
Fine adjust "RCUT", "GCUT" or "BCUT" to be black.
RCUT Data : 40H
GCUT Data : 40H
BCUT Data : 40H
GDRV Data : 40H
BDRV Data : 40H
PIP SUB-BRIGHTNESS
(PBOF)
PIP WHITE BALANCE
(PGOF, PROF)
PIP SUB-TINT
(PHUE)
Adjust to match the PIP screen to the brightness, white balance and tint of the
main picture.

–14 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
MTS ADJUSTMENT (FOR N2N, N2F, N2ES CHASSIS)
No. ITEM INPUT SIGNAL ADJUSTMENT PROCEDURE
ATTENUATOR
(ATT)
1
STEREO VCO
(STVC)
2
STEREO FILTER
(STRF)
3
STEREO SEPARATION
(WBAN)
4
•1kHz 30% mod. →ANT
terminal
1. Connect rms meter to pin 34 of QG01.
2. Display item ATT on screen.
3. Change data by VOLUME s/tbuttons so
that the reading of meter becomes value
as close as 137mVrms.
•No signal 1. Short circuit RG44 with a jumper wire.
2. Display item STVC on screen.
3. Connect frequency counter to pin 34 of
QG01.
4. Change data by VOLUME s/tbuttons so
that the reading of counter becomes value
as close as 15.73kHz.
5. Remove the short jumper from RG44.
•15.734kHz 30mV(rms) →
Across Point between CG07
and RG44
1. Unsolder the solder link SL02.
2. Display item STRF on screen.
3. Connect oscilloscope to pin 34 of QG01.
4. Change data by VOLUME s/tbutton to
minimize AC output level on scope.
5. Resolder SL02.
•STEREO 300Hz (30% mod.)
R-channel only →ANT
1. Display item WBAN on screen.
2. Connect oscilloscope to pin 35 of QG01.
3. Change data by VOLUME s/tbuttons so
that 300Hz element on scope becomes
minimum.
•STEREO 3kHz (30% mod.)
R-channel only →ANT
1. Display item SPEC on screen.
2. Connect oscilloscope to pin 35 of QG01.
3. Change data by VOLUME s/tbuttons so
that 3KHz element on scope becomes
minimum.
SAP VCO
(SAVC)
5•No signal 1. Shortcircuit RG44 with a short jumper.
2. Connect 1Mohm resistor between pin 12 of
QG01 and ground.
3. Display item SAVC on screen.
4. Connect frequency counter to pin 34 of
QG01.
5. Change data by VOLUME s/tbuttons so
that the reading of counter becomes value
as close as 78.67kHz.
6. Remove the short jumper and 1M ohm
resistor.
(SPEC)
H001 QG01
CG44 RG44
CG07
RG43
14
7
(1)Jumper wire
+
+

H001 QG01
SL02
CG44 RG44
CG07
15.734KHz 30mV(rms)
RG43
14
7
(1)
+
+
H001 QG01
14
7
(2)
(1) Jumper
wire
12
++
CG44 RG43
RG44
1M
CG07

–15 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
CIRCUIT CHECKS
Troubleshooting Guide for Fail Safe Circuit
Check that the set returns to normal operation when pin 12
of Z801(or emitter of Q472) is grounded with jumper wire.
Check the voltage across
Capacitor C471 is
approximately (C) volts.
Refer to table –4 for
fail safe voltage (C) .
Faulty power
circuit or hori-
zontal circuit.
Defective Fail Safe Circuit
(See SETTING & ADJUSTING
DATA on page16)
YES NO
NO
YES
HIGH VOLTAGE CHECK
CAUTION: There is no HIGH VOLTAGE ADJUSTMENT on
this chassis. Checking should be done following the steps
below.
1. Connect an accurate high voltage meter to the second an-
ode of the picture tube.
2. Turn on the receiver. Set the BRIGHTNESS and CON-
TRAST controls to minimum (zero beam current).
3. High voltage must be measured below (B) kV.
Refer to table-1 for high voltage (B).
(See SETTING & ADJUSTING DATA on page 16)
4. Vary the BRIGHTNESS control to both extremes to be sure
the high voltage does not exceed the limit under any con-
ditions.
FS CIRCUIT CHECK
The Fail Safe (FS) circuit check is indispensable for the final
check in servicing. Checking should be done following the
steps below.
1. Turn the receiver on and press the RESET button.
2. Temporarily short TP-(R) and TP-(X) with a jumper wire.
Raster and sound will disappear.
3. The receiver must remain in this state even after removing
the jumper wire. This is the evidence that the FS circuit is
functioning properly.
4. To obtain a picture again, temporarily turn the receiver off
and allow the FS circuit more than 5 seconds to reset.Then
turn the power switch on to produce a normal picture.

–16 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA
CHAPTER 2 SPECIFIC INFORMATIONS
Table-1
SAFETY INSTRUCTIONS
SERVICE MODE
ADJUSTING ITEMS AND DATAS IN THE SERVICE MODE:
RCUT
GCUT
BCUT
GDRV
BDRV
SCNT
BRTC
COLC
TNTC
SAVC
ATT
STVC
STRF
SPEC
WBAN
HPOS
VPOS
40H
40H
40H
40H
40H
0AH
40H
3AH
44H
20H
20H
20H
20H
20H
20H
16H
03H
Item Name of adjustment Preset Data
R CUTOFF
G CUTOFF
B CUTOFF
G DRIVE
B DRIVE
SUB-CONTRAST
SUB-BRIGHT
SUB-COLOR
SUB-TINT
SAP VCO
ATTENUATOR
STEREO VCO
STEREO FILTER
SPECTRAL
STEREO SEPARATION
HORIZ. POSITION
VERT. POSITION
Item Name of adjustment Preset
HIT
LIN
VSC
VPS
VCP
WID
DPC
CNR
TRAP
HCP
VFC
PCOL
PHUE
PGOF
PROF
PBOF
RGBB
HEIGHT
V-LINEARITY
V-S CORRECTION
V-SHIFT
V-COMPENSATION
PICTURE WIDTH
E-W PARABOLA (DPC)
E-W CORNER
TRAPEZIUM
H-COMPENSATION
V-F CORRECTION
PIP COLOR
PIP TINT
PIP
PIP
PIP
RGB BRIGHT
20H
08H
04H
01H
03H
17H
0CH
02H
06H
00H
0FH
0FH
11H
36H
17H
17H
0BH
←
06H
02H
←
←
18H
0AH
07H
09H
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
←
Table-2
DESIGN MODE
ADJUSTING ITEMS AND DATAS IN THE DESIGN MODE:
Item Name of adjustment Preset Data Data Remarks
Table-3
CIRCUIT CHECKS
Table-4
Data
OPT1 OPTION1 84H 04H
OPT2 OPTION2 01H 01H
27"
HIGH VOLTAGE AT ZERO BEAM: (A) 28.5kV
MAX HIGH VOLTAGE: (B) 29.7kV
27"
FBT DETECTION VOLTAGE (C) 21.87 V

–17 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
L/MONO R
AUDIO
MENU
VIDEO-3 IN
INSIDE DOOR
VIDEO
TV/VIDEO VOLUME CHANNEL
POWER
R
L/
MONO
S-VIDEO
COLOR
STREAM
INPUT
VIDEO
Y
PB
PM
VIDEO1
AUDIO
VIDEO2
R
L/
MONO
VIDEO
ANT1
AUDIO
R
L
AUDIO
OUT DVD IN
ANT (75Ω)
IN
OUT ANT2
LOCATION OF CONTROLS (Representative: 27AF62)
Front view Rear view
VIDEO/AUDIO terminals
TV/VIDEO CHANNEL
t/ s
VOLUME
T/ S
MENU
POWER
Remote sensor
POWER indicator Antenna/Cable terminals
VIDEO-3 IN
Rear Term

–18 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
CH RTN
ADV/
PIP CH
ADV/
PIP CH
TV
CABLE
LIGHT
MUTE TV/VIDEO TIMER
RECALL POWER
VCR
CH
VOL
ENT
PLAY PIP
REC
STILL LOCATE SWAP
TV/VCR REW FF
STOP SOURCE
FAV FAV
C.CAPT
EXIT
MENU
RESET
1
4
7
2
5
8
3
6
9
0
100
ENTER
Remote Control
LIGHT
TV/CABLE/VCR switch
Set to “TV”to control the TV.
MUTE
Channel Number
C. CAPT
ENTER
FAV t
RESET
PIP CH t
RECALL
POWER
TIMER
TV/VIDEO
CHANNEL s/t
VOLUME s/t
CH RTN
PIP CH
s
FAV s
EXIT
MENU
PIP functions
(For “TV”and “CABLE”modes)
s/t/T/S

–19 –
GENERAL ADJUSTMENTS
SPECIFIC INFORMATIONS
PROGRAMMING CHANNEL MEMORY
The channel memory is the list of TV channel numbers your TV will stop on when you press the CHANNEL sor tbutton.
First, use the TV/CABLE and CH PROGRAM functions to preset all active channels in your area automatically.
If necessary, arrange the preset channels with the ADD/ERASE functions so that you can tune into only desired channels.
Note: If you utilize both ANT-1 and ANT-2 terminals for some model, perform programming channels for each input source.
TV/CABLE function
1Press MENU, then press Sor Tuntil the SET UP menu
appears.
2Press t(or s) until “TV/CABLE”is highlighted.
3Press Sor Tto highlight either “TV”or “CABLE”, which-
ever you use.
ADD/ERASE function
After performing the CH PROGRAM function, you can add or
erase specific channels.
1Select the channel you want to erase using the CHAN-
NEL sor tbutton, or select the channel you want to add
using the Channel Number buttons.
2Press MENU, then press Sor Tuntil the SET UP menu
appears.
3Press t(or s) until “ADD/ERASE”is highlighted.
4Press Sor T:
To erase the channel
Press the button until “ERASE”is highlighted.
To add the channel
Press the button until “ADD”is highlighted.
5Repeat steps 1 to 4 for other channels.
You have now completed the channel programming.
Note: The CHANNEL t/sbuttons on the TV function as the
t/sbuttons while a menu is on the screen.
*Please refer to owner's manual in detail.
CH PROGRAM function
1Select “CH PROGRAM”following steps 1 and 2 above.
2Press Sor Tto start channel programming.
The TV will automatically cycle through all the TV or CA-
BLE channels selected by the TV/CABLE function, and
store active channels in the channel memory.
3When channel programming is complete, you will see the
message to the right appears.
4Press CHANNEL sor tto make sure the channel pro-
gramming has been done properly.

– 20 –
SPECIFIC INFORMATIONS
LocationLocation
LocationLocation
Location Parts No.Parts No.
Parts No.Parts No.
Parts No. DescriptionDescription
DescriptionDescription
Description
No.No.
No.No.
No.
LocationLocation
LocationLocation
Location Parts No.Parts No.
Parts No.Parts No.
Parts No. DescriptionDescription
DescriptionDescription
Description
No.No.
No.No.
No.
CAPACITORS
C102 24793221 ELECTROLYTIC, 10 220UF M
C105 24212102 CERAMIC DISC, 50 B 1000PF K
C106 24797479 ELECTROLYTIC, 50 4.7UF M
C107 24763221 ELECTROLYTIC, 16 220UF M
C112 24793221 ELECTROLYTIC, 10 220UF M (27AF62)
C115 24212101 CERAMIC DISC, 50 B 100PF K (27AF62)
C117 24763221 ELECTROLYTIC, 16 220UF M (27AF62)
C150 24794101 ELECTROLYTIC, 16 100UF M (27AF62)
C201 24503041 PLASTIC FILM , 63 0.1UF J
C204 24797010 ELECTROLYTIC, 50 1UF M
C205 24794100 ELECTROLYTIC, 16 10UF M
C207 24436270 CERAMIC DISC, 50 SL 27PFJ
C208 24436270 CERAMIC DISC, 50 SL 27PFJ
C209 24436270 CERAMIC DISC, 50 SL 27PFJ
C213 24503041 PLASTIC FILM , 63 0.1UF J
C216 24797100 ELECTROLYTIC, 50 10UF M
C220 24539474 PLASTIC FILM, 50 0.47UF J
C221 24232103 CERAMIC DISC, 50 F 10000PF Z
C222 24232103 CERAMIC DISC, 50 F 10000PF Z
C223 24232103 CERAMIC DISC, 50 F 10000PF Z
C224 24503041 PLASTIC FILM , 63 0.1UF J
C225 24503041 PLASTIC FILM , 63 0.1UF J
C226 24503041 PLASTIC FILM , 63 0.1UF J
C245 24232103 CERAMIC DISC, 50 F 10000PF Z
C261 24503041 PLASTIC FILM , 63 0.1UF J
C262 24503041 PLASTIC FILM , 63 0.1UF J
C263 24503041 PLASTIC FILM , 63 0.1UF J
C271 24436561 CERAMIC DISC, 50 SL 560PF J
C301 24214471 CERAMIC DISC, 500 B 470PF K
C304 24693473 PLASTIC FILM, 100 0.047UF J
C305 24617912 ELECTROLYTIC, 50 2.2UF K 3A LI
C306 24073059 ELECTROLYTIC, 25 3300UF M 3A
C308 24669221 ELECTROLYTIC, 50 220UF M 3A
C309 24436101 CERAMIC DISC CC45 SL 50 100PF J
C310 24073094 ELECTROLYTIC, 50 1000UF M 3A
C312 24503038 MT PLA CAP 63 0.056UF J
C313 24082057 PLASTIC FILM, 100 220000PF J
C317 24214471 CERAMIC DISC, 500 B 470PF K
C319 24212102 CERAMIC DISC, 50 B 1000PF K
C320 24669101 ELECTROLYTIC, 50 100UF M 3A
C323 24567474 PLASTIC FILM, 50 0.47UF J
C324 24503037 MT PLA CAP 63 0.047UF J
C325 24503039 MT PLA CAP 63 0.068UF J
C326 24503041 PLASTIC FILM , 63 0.1UF J
C327 24617915 ELECTROLYTIC, 50 1UF K 3A LI
C337 24797229 ELECTROLYTIC, 50 2.2UF M
C360 24793221 ELECTROLYTIC, 10 220UF M
C361 24794101 ELECTROLYTIC, 16 100UF M
C366 24693104 PLASTIC FILM, 100 0.1UF J
C370 24668101 ELECTROLYTIC, 35 100UF M 3A
C371 24668100 ELECTROLYTIC, 35 10UF M 3A
C400 24503041 PLASTIC FILM , 63 0.1UF J
C403 24591103 PLASTIC FILM, 50 0.01MF J
C404 24797010 ELECTROLYTIC, 50 1UF M
C407 24503041 PLASTIC FILM , 63 0.1UF J
C408 24591273 PLASTIC FILM, 50 0.027UF J
C409 24763221 ELECTROLYTIC, 16 220UF M
C410 24232103 CERAMIC DISC, 50 F 10000PF Z
C413 24214821 CERAMIC DISC, 500 B 820PF K
C415 24539224 PLASTIC FILM, 50 0.22UF J
C416 24678010 ELECTROLYTIC, 200 1UF M 3A
C417 24214391 CERAMIC DISC, 500 B 390PF K
C430 24232103 CERAMIC DISC, 50 F 10000PF Z
C431 24794101 ELECTROLYTIC, 16 100UF M
C439 24829753 PLASTIC FILM, 400 75000PF J (27AF62)
C439 24503125 PLASTIC CAP T 400 753J (27AF42)
C441 24082925 PLASTIC FILM CF92 T 315 0.62UF J
* C442 24082918 PLASTIC FILM, 315 0.33UF J
* C443 24082952 PLASTIC FILM CF92 T 1500 H 6200PF H
* C444 24082964 PLASTIC FILM, 1500 H 10000PF H
C445 24828563 PLASTIC FILM, 200 56000PF J
C446 24679100 ELECTROLYTIC, 250 10UF M 3A
C447 24214471 CERAMIC DISC, 500 B 470PF K
C448 24640962 CHEMICON 04H 200 330M
C449 24666102 ELECTROLYTIC, 16 1000UF M 3A
C450 24829393 PLASTIC FILM, 400 39000PF J
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY
PRECAUTION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL.
CAUTION: The international hazard symbols “ ” in the schematic diagram and the parts list designate com-
ponents which have special characteristics important for safety and should be replaced only with types identical to
those in the original circuit or specified in the parts list. The mounting position of replacements is to be identical with
originals. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE. Do not
degrade the safety of the receiver through improper servicing.
NOTICE:
• The part number must be used when ordering parts, in order to assist in processing, be sure to include the Model
number and Description.
• The PC board assembly with *mark is no longer available after the end of the production.
Model : 27AF62, 27AF42
Capacitors ............. CD : Ceramic Disk PF : Plastic Film EL : Electrolytic
Resistors ............... CF : Carbon Film CC : Carbon Composition MF : Metal Film
OMF : Oxide Metal Film VR : Variable Resistor FR : Fusible Resistor
(All CD and PF capacitors are ±5%, 50V and all resistors, ±5%, 1/6W unless otherwise noted.)
CHASSIS AND CABINET REPLACEMENT PARTS LIST