SERVICE MANUAL
SUMMARY
N0NSP Chassis
COLOR TELEVISION
FILE NO. 023-200018
50AX60
(TAC0058)
PUBLISHED IN JAPAN, Jun., 2000
S
50AX60 is the same as 50A60 except for the parts and bus data of micro-processor tabled on
back of this sheet.
Use this service manual together with the original service manual of 50A60, 50A50, 55A60,
61A60 (File No. 020-200012).
SETTING & ADJUSTING DATA DIFFERENCES
SERVICE MODE
ADJUSTING ITEMS AND DATA IN THE SERVICE MODE:
Item
Name of adjustment
Preset
Data
PHUE
PCNT
PCOL
PYOF
PIOF
PQOF
PIP TINT
PIP CONTRAST
PIP COLOR
PIP Y OFFSET
PIP I OFFSET
PIP Q OFFSET
40H
12H
19H
07H
1DH
1DH
Table-2
TOSHIBA CORPORATION
1-1, SHIBAURA 1-CHOME, MINATO-KU, TOKYO 105-8001, JAPAN
Location
No.
Part No.
Description
A101
23411372
Wood Cabinet
A102
23527131
Speaker Grille R
A103
23527132
Speaker Grille L
A201
23549478
Bezel
A202
23450263
Control Panel
A213
23427724
Door
A268
23450261
Front Panel
A701
23525895
Carton
* E031Z
CRT-D/R Board, PB9454G1
* E032Z
CRT-D/G Board, PB9454G2
* E033Z
CRT-D/B Board, PB9454G3
* E034Z
FRONT-CON Board, PB9454G4
* E035Z
FRONT-IN Board, PB9454G5
* E036Z
SVM Board, PB9454G6
* E040Z
REM Board, PB9454G10
K111
23430479
Delta, 36-A/B Assembly
K112
23430479
Delta, 36-A/B Assembly
K113
23430479
Delta, 36-A/B Assembly
K501
23430793
Lenti Sheet, SCREEN50KKPL
K502
23430799
Fresnel Sheet,
SCREEN50KKPF
Location
No.
Part No.
Description
K503
23430777
SCR-PRO50RK
K511
23430779
SCREEN50KKP2
K601
23430509
Mirror, MIRROR50H
K912
23306370
Remote Hand Unit, CT-90047
QA01
23000443
IC, MN102L35GFC
R435
24322278
MF, 0.27 ohm, 1W
R900
24000945
FR, 1.8 ohm, 2W
* U801
DEF/Power Board, PB9451E
* U901
Signal/CON Board, PB9450J
* UV01
A/V Board, PB9452E
UY01
23148736
Module, MKMU31,
MULTI PICTURE PNT
UZ01
23148718
Module, MYCJ31
* V901R
23005419
Protector Coupling R 50AX60
* V902G
23005420
Protector Coupling G 50AX60
* V903B
23005424
Protector Coupling B 50AX60
Y101
23563956
Owner's Manual, English,
50AX60
Y101F
23563957
Owner's Manual, French,
50AX60
Z410
23110842
Coil, Forcus, TPA6031
REPLACEMENT PARTS LIST DIFFERENCES
TOSHIBA CORPORATION
1-1, SHIBAURA 1- CHOME, MINATO-KU, TOKYO 105-8001, JAPAN
FILE NO. 020-200012
SERVICE MANUAL
PUBLISHED IN JAPAN,
May., 2000
S
COLOR TELEVISION
N0NSP Chassis
50A60, 50A50
55A60, 61A60
(TAC0050)
(TAC0052)
(TAC0051)
(TAC0053)
2
GENERAL
ADJUSTMENTS
SPECIFIC
INFORMATIONS
TABLE OF CONTENTS
CHAPTER 1 GENERAL ADJUSTMENTS
SAFETY INSTRUCTIONS ........................................................................................................................................ 3
CRT ASSEMBLY REPLACEMENT AND MOUNTING ............................................................................................. 4
PICTURE TUBE COMPONENTS ADJUSTMENT .................................................................................................... 6
REPLACEMENT OF THE CRT ................................................................................................................................. 8
SERVICE MODE ...................................................................................................................................................... 9
ELECTRICAL ADJUSTMENT ................................................................................................................................ 11
CONVERGENCE ADJUSTMENT .......................................................................................................................... 13
SCREEN AND MIRROR ALIGNMENTS ................................................................................................................ 15
CIRCUIT CHECKS ................................................................................................................................................. 16
CHAPTER 2 SPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA .............................................................................................................................. 17
LOCATION OF CONTROLS ................................................................................................................................... 18
PROGRAMMING CHANNEL MEMORY ................................................................................................................. 20
CIRCUIT BLOCK DIAGRAM .................................................................................................................................. 21
MECHANICAL DISASSEMBLY .............................................................................................................................. 23
CHASSIS REPLACEMENT PARTS LIST ............................................................................................................... 25
PC BOARDS BOTTOM VIEW ................................................................................................................................. 41
TERMINAL VIEW OF TRANSISTORS ................................................................................................................... 51
SPECIFICATIONS .................................................................................................................................................. 53
APPENDIX:
CIRCUIT DIAGRAM
3
GENERAL
ADJUSTMENTS
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 charac-
teristics 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 radia-
tion or other hazards.
PRODUCT SAFETY NOTICE
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.
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 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 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 volt-
meter having 5000 ohms per volt or more sensitivity in the
following manner:
AC VOLTMETER
0.15
µF
Good earth ground
such as a water
pipe, conduit, etc.
Place this probe on
each exposed
metallic part.
1500 ohm
10 watt
SAFETY PRECAUTION
1. Excessive high voltage can produce potentially hazardous
X-RAY RADIATION. To avoid such hazards, the high volt-
age 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 cir-
cumstances, exceed (B) kV.
Refer to table-1 for high voltage (A), (B).
(See SETTING & ADJUSTING DATA on page 17)
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.
X-RAY RADIATION PRECAUTION