Toshiba 2152 DB Service Manual

TOSHIBA 2152 DB
General Information
Chassis: C5S
Safety Instructions
X-RAY RADIATION PRECAUTION
2. It is essential that to maintain the safety of the
1. The E.H.T. must be checked every time the
customer all cable forms be replaced exactly
receiver is serviced to ensure that the C.R.T.
as supplied from factory.
does not emit X-ray radiation as result of
3. A small part of the chassis used in this
excessive E.H.T. voltage. The nominal E.H.T.
receiver is, when operating, at approximately
for this receiver is 27.8 kV at zero beam
half mains potential at all times. It is therefore
current (minimum brightness) operating at
essential in the interest of safety that when
240V a.c. The maximum E.H.T. voltage
serving or connecting any test equipment the
permissible in any operating circumstances
receiver should be supplied via a suitable
must not exceed 29.0 kV. When checking the
isolating transformer of adequate rating.
E.H.T., use the 'High Voltage Check' proce-
4. Replace blown fuses within the receiver with
dure in this manual using an accurate E.H.T.
the fuse specified in the parts list.
voltmeter.
5. When replacing wires or components to
2. The only source of X-RAY radiation in this
terminals or tags, wind the leads around the
receiver is the C.R.T. To prevent X-ray
terminal before soldering. When replacing
radiation, the replacement C.R.T. must be
safety components identified by the interna-
identical to the original fitted as specified in
tional hazard symbols on the circuit diagram
the Parts List.
and parts list, it must be a Toshiba approved
3. Some components used in this receiver have
type and must be mounted as the original.
safety related characteristics preventing the
6. Keep wires away from high temperature
C.R.T. from emitting X-ray radiation. For
components.
continued safety, replacement component
should only be made after referring the
PRODUCT SAFETY NOTICE
Product Safety Notice below.
Many electrical and mechanical components in
this chassis have special safety-related
SAFETY PRECAUTION
characteristics. These characteristics are often
1. This receiver has a nominal working E.H.T.
passed unnoticed by a visual inspection and the
voltage of 24.5 kV. Extreme caution should be
X-ray radiation protection afforded by them
exercised when working on the receiver with
cannot necessarily be obtained by using
the back removed. Do not attempt to service
replacements rated at higher voltages or
this receiver if you are not conversant with the
wattage, etc. Components which have these
precautions and procedures for working on
special safety characteristics in this manual and
high voltage equipment. When handling or
its supplements are identified by the interna-
working on the C.R.T., always discharge the
tional hazard symbols on the schematic diagram
anode to the receiver chassis before removing
and parts list. Before replacing any of these
the anode cap. The C.R.T., if broken, will
components read the parts list in this manual
violently expel glass fragments. Use shatter
carefully. Substitute replacement components
proof goggles and take extreme care while
which do not have the same safety characteris-
handling. Do not hold the C.R.T. by the neck
tics as specified in the parts list may create X-
as this is a very dangerous practice.
ray radiation
Recommended Safety Parts
Item Part No. Description
PF, 6600pF, ±3%, 1500V
C440 24082476
CD, 1500pF, ±10%
C463 24212152
PF, 0.22uF, ±20%, AC250V
C801 24082363
C813 24094656 CD,2200pF,±20%, AC400V
C814 24094656 CD,2200pF,±20%, AC400V
R327 24339569 MF, 5.6 ohm, 2W
R448 24338338 MF, 0.33 ohm, 1W
R801 24009954 Metal-Glazed Resistor, 2.2M ohm, 1/2W
R808 24019340 PTC Thermistor, 290V, 18 ohm
R890 24381333 OME, 33k ohm, 1/2W
R899 24005007 Metal-Glazed Resistor, 8.2M ohm, 1W
R920 24000940 FR, 2 ohm, 2W
R920 24000568 FR, 4.7 ohm, 1W
L462 ------------- DY, Supplied with V901
L901 23200205 Coil, Degaussing, TSB-2333AR
T401 23224983 Transformer, Horiz. Drive, TLN1039
T461 23236464 Transformer, Flyback, TFB41 23AR
T801 23211858 Line Filter, TRF3139
T862 23217287 Transformer, Converter, TPW3331AR
Q404 23314375 Transistor, ON4409(508D)
Q862 A8643108 Photo Coupler, TLP621(GR-LF
F470 23144875 Fuse, 0.63A
F801 23144507 Fuse, 3.15A
P801 23372012 Power Cord
S801 23145434 Switch, Power, 2C2P
V901A 23902067 Socket, CRT, 10P
V901 23312642 Picture Tube, A51EF543X69
V901 23312571 Picture Tube, A51EAL55X01
Safety Instructions / Safety Parts / Service Adjustments / Service Mode General Instructions / Service Mode Cont'd / Test Signal Selection
Adjustment of Video Chroma System / CRT Diagram / Text Diagram / AV Diagram / Main Diagram / Main Diagram Cont'd
Service Adjustments
GENERAL INFORMATION
All adjustments are thoroughly checked and
corrected when the receiver leaves the factory.
Therefore the receiver should operate normally
and produce proper colour and B/W pictures
upon installation. However, several minor
adjustments may be required depending on the
particular location in which the receiver is
operated.
This receiver is shipped completely in cardboard
carton. Carefully draw out the receiver from the
carton and remove all packing materials. Plug
the power cord into a convenient 240 volts 50
Hz AC two pin power outlet. Turn the receiver
ON. Check and adjust all the customer controls
such as BRIGHTNESS, CONTRAST and
COLOUR Controls to obtain natural colour or B/
W picture.
AUTOMATIC DEGAUSSING
A degaussing coil is mounted around the picture
tube so that external degaussing after moving
the receiver is normally unnecessary, providing
the receiver is properly degaussed upon
installation. The degaussing coil operates for
about 1 second after the power to the receiver is
switched ON. If the set is moved or faced in a
different direction, the power switch must be
switched off at least 30 minutes in order that the
automatic degaussing circuit operates properly.
Should the chassis or parts of the cabinet
become magnetized to cause poor colour purity,
use an external degaussing coil. Slowly move
the degaussing coil around the faceplate of the
picture tube, the sides and front of the receiver
and slowly withdraw the coil to a distance of
about 2 m before disconnecting it from AC
source. If colour shading still persists, perform
the COLOUR PURITY ADJUSTMENT and
CONVERGENCE ADJUSTMENTS procedures.
HIGH VOLTAGE CHECK
CAUTION: There is no HIGH VOLTAGE
ADJUSTMENT on this chassis.
1. Connect an accurate high voltage meter to
the second anode of the picture tube.
2. Turn on the receiver. Set the BRIGHTNESS
and CONTRAST Controls to minimum (zero
beam current).
3. High voltage will be measured below 29.0 kV
(2152DB), 32.0 kV (2857DB).
HEIGHT ADJUSTMENT
RTV servis Horvat
1. Receive the UK PHILIPS pattern, and set the
contrast to max, colour and brightness to
Tel: ++385-31-856-637
centre.
Tel/fax: ++385-31-856-139
2. Adjust HEIGHT Control (R350) so that white
Mob: 098-788-319
blocks at top and bottom of the picture are
www.rtv-horvat-dj.hr
just masked.
HORIZONTAL CENTRE ADJUSTMENT
1. Receive the UK PHILIPS pattern.
2. Adjust HPOS (Bus control) so the pattern
centre can be located at the screen centre.
FOCUS ADJUSTMENT
Adjust FOCUS Control on FLYBACK TRANS.
(T461) for well defined scanning lines in the
centre area on the screen.
SET-UP ADJUSTMENT
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 figures
1
COLOR PURITY ADJUSTMENT
NOTE: Before attempting any purity adjust-
ments, the receiver should be operated for at
least fifteen minutes.
1. Demagnetize the picture tube and cabinet
using a degaussing 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 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 tempo-
rarily.
8. Check the purity of the red and blue raster.
CONVERGENCE ADJUSTMENTS
NOTE: Before attempting any convergence
adjustments, the receiver should be operated for
at least fifteen minutes.
CENTRE 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 and superim-
pose 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 superim-
pose 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.
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. (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.
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.
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
Service Mode General
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
1. ENTERING TO SERVICE MODE
the yoke and check the yoke is firm.
9. Stick three adhesive tapes on wedges.
1) Press button once on Remote Control.
2) Press button again to keep pressing.
3) Keep pressing the
button on TV set.
RCUT
32H
(Service mode dIsplay)
2. SELECTING THE ADJUSTING ITEMS
Every pressing of CHANNEL
the adjustment items in the following order.
( button for reverse order.)
3. ADJUSTING THE DATA
Pressing of VOLUME
the value of data in the range from 00 to FF. The
variable range depends on the adjusting item.
4. NORMAL OPERATION ON THE SERVICE
MODE
Press MENU button on TV.
Adjustment mode
RCUT
32H
5. EXIT FROM SERVICE MODE
Press POWER button on the remote control to
turn off the TV once.
Dot Movement Pattern
Instructions
button, press MENU
S
button changes
or button will change
Service mode
Address S
Data
Press
Press