TOSHIBA 2151 TB1
Substitute replacement components which do2. Adjust HEIGHT Control (R351) so that whiteCUT OFF Controls to obtain a good white
General Information
not have the same safety characteristics asblocks at top and bottom of the picture are arebalance in both low and high light areas.
specified in the parts list may create X-rayjust masked.
Chassis : C4E-RradiationSUB-BRIGHTNESS ADJUSTMENT
HORIZONTAL CENTRE ADJUSTMENT
Service Adjustments1. Tune in a colour programme of Philips
1. Receive the UK PHILIPS pattern.pattern.
fragments. Use shatter proof goggles andGENERAL INFORMATION2. Set the contrast and colour to centre, and the2. Set the CONTRAST Control to the minimum
Safety Instructions
take extreme care while handling. Do not holdbrightness to centre.and the BRIGHTNESS Control to the centre.
X-RAY RADIATION PRECAUTIONthe C.R.T. by the neck as this is a veryAll adjustments are thoroughly checked and3. Adjust H. CENTER USER Control (R451) so3. Set the COLOUR Control to the minimum.Example of screen display in level adjustment
1. The E.H.T. must be checked every time thedangerous practice.corrected when the receiver leaves the factorythe pattern can be located for d-c to be + 4.0 mm..4. Set the SUB-BRIGHT. Control (R551) so that
receiver is serviced to ensure that the C.R.T2. It is essential that to maintain the safety of the.Therefore the receiver should operate normallythe voltage across terminals Y-Z can be 0.2 ?PICTURE I-F ALIGNMENT
does not emit X-ray radiation as result ofcustomer all cable forms be replaced exactlyand produce proper colour and B/W pictures0.05V with voltmeter and leave the receiver
excessive E.H.T. voltage. The nominal E.H.Tas supplied from factory..upon installation. However, several minorfor five minutes in this state.GENERAL
for this receiver is 29.8 kV at zero beam3. A small part of the chassis used in thisadjustments may be required depending on the5. Watching the picture well, adjust the SUB-Refer to figure 4 for test equipment connection.
current (minimum brightness) operating atreceiver is, when operating, at approximatelyparticular location in which the receiver isBRIGHT. Control in the position where the
240V a.c. The maximum E.H.T. voltagehalf mains potential at all times. It is thereforeoperated.picture does not show evidence of bloomingPRELIMINARY STEPS
permissible in any operating circumstancesessential in the interest of safety that whenThis receiver is shipped completely in cardboardin high bright area and not appear too dark inSupply +5 volts to the 5V-1 line.
must not exceed 31.5 kV. When checking theserving or connecting any test equipment thecarton. Carefully draw out the receiver from thelow bright portion.
E.H.T., use the �High Voltage CheckO proce-receiver should be supplied via a suitablecarton and remove all packing materials. Plug6. Check the proper picture variation by rotatingSIGNAL GENERATOR
dure in this manual using an accurate E.H.Tisolating transformer of adequate rating..the power cord into a convenient 240 volts 50FOCUS ADJUSTMENTthe CONTRAST and BRIGHTNESS Controls Connect to both leads of R101 with signal level
voltmeter.4. Replace blown fuses within the receiver withHz AC two pin power outlet. Turn the receiverto both extremes.of 75 dB?, and open the solder-link at IF OUT of
2. The only source of X-RAY radiation in thisthe fuse specified in the parts list.ON. Check and adjust all the customer controlsAdjust FOCUS Control on FLYBACK TRANS. 7. If the picture does not appear dark with thetuner on the Main Board. (See figure 4.)
receiver is the C.R.T. To prevent X-ray5. When replacing wires or components tosuch as BRIGHTNESS, CONTRAST and(T461) for well defined scanning lines in theCONTRAST and BRIGHTNESS Controls
radiation, the replacement C.R.T. must beterminals or tags, wind the leads around theCOLOUR Controls to obtain natural colour or B/centre area on the screen.turned to the minimum, or not appear brightDVM
identical to the original fitted as specified interminal before soldering. When replacingW picture.with the controls turned to the maximum,Connect to pin #44 of 1C501 on the Main Board
the Parts List.safety components identified by the interna-DELAYED R-F AGC ADJUSTMENTadjust the SUB-BRIGHT. Control again for thethrough the detector.
3. Some components used in this receiver havetional hazard symbols on the circuit diagramAUTOMATIC DEGAUSSINGacceptable picture.
safety related characteristics preventing theand parts list, it must be a Toshiba approved1. Tune the set to the strongest station in your
C.R.T. from emitting X-ray radiation.type and must be mounted as the original.A degaussing coil is mounted around the picturearea.BUS DATA SETTING
For continued safety, replacement component6. Keep wires away from high temperaturetube so that external degaussing after moving2. Turn AGC DELAY Control (R151) on PIF
should only be made after referring thecomponents.the receiver is normally unnecessary, providingBoard to fully counterclockwise position.1. In the TV set of initial lot of production,
Product Safety Notice.the receiver is properly degaussed upon3. Adjust AGC DELAY Control clockwise untilSAA5290ZP/024 is used for QA01. But
PRODUCT SAFETY NOTICEinstallation. The degaussing coil operates fornoise (snow) disappears on the screen.replace with SAA5290ZP/032 for servicing.
SAFETY PRECAUTIONMany electrical and mechanical components inabout 1 second after the power to the receiver is2. When QA01 only is replaced, it is not
1. This receiver has a nominal working E.H.Tthis chassis have special safety-related.switched ON. If the set is moved or faced in aCRT GREY SCALE ADJUSTMENTnecessary to change the mode data.
voltage of 26.0 kV. Extreme caution should becharacteristics. These characteristics are oftendifferent direction, the power switch must be3. When memory IC (QA02) is replaced, change
exercised when working on the receiver withpassed unnoticed by a visual inspection and theswitched off at least 30 minutes in order that the1. Press VIDEO INPUT button on Remotethe mode data in the manner below.
the back removed.X-ray radiation protection afforded by themautomatic degaussing circuit operates properlyControl unit to turn .TV to video input mode.
Do not attempt to service this receiver if youcannot necessarily be obtained by usingShould the chassis or parts of the cabinetNext press PICTURE SELECT button to
are not conversant with the precautions andreplacements rated at higher voltages orbecome magnetized to cause poor colour purityselect function and set CONTRAST to,ADJUSTMENT METHOD FOR SERVICINGFigure 4. Picture IF Alignment
procedures for working on high voltagewattage, etc. Components which have theseuse an external degaussing coil. Slowly moveminimum, BRIGHTNESS to maximum,
equipment.special safety characteristics in this manual andthe degaussing coil around the faceplate of theCOLOUR to minimum.1.OUTLINESTEP
Detector Coil
When handling or working on the C.R.Tits supplements are identified by the interna-.,picture tube, the sides and front of the receiver2. Turn the SCREEN Control (on T461) fullyIn the service mode, MODE DATA adjustments
always discharge the anode to the receivertional hazard symbols on the schematic diagramand slowly withdraw the coil to a distance ofcounterclockwise.can be made easily with user remote control
SIGNAL GENERATOR
chassis before removing the anode cap.and parts list. Before replacing any of theseabout 2 m before disconnecting it from 3. Set the RED, GREEN and BLUE CUT OFFACunit. (CT-9689 only)39.5 MHz CARRIER WAVE (Level 75 dB?)
The C.R.T., if broken, will violently expel glasscomponents read the parts list carefullysource. If colour shading still persists, perform.Controls (R557, R558, R559)
the COLOUR PURITY ADJUSTMENT andcounterclockwise to the centre position.2.SERVICE MODE OPERATIONADJUST
4. Set the CUT OFF SW. (S202) in the H. lineT103CONVERGENCE ADJUSTMENTS procedures.
position.2-1. How to Enter the Service Mode
Recommended Safety PartsREMARKS
HIGH VOLTAGE CHECK5. Set the SUB BRIGHTNESS Control to
1. Supply external DC power (+ 5V) to 5V-1 line.
minimum.2. Supply + 8V to pin 36 of IC501.
ItemPart No.Description
CAUTION: There is no HIGH VOLTAGE6. Rotate the SCREEN Control gradually3. Supply external DC power to + 12V line.
C44024082343PF, 5600pF?, 3%, 1500Vclockwise until the first horizontal line of a4. Apply test signal to IF input.ADJUSTMENT on this chassis.
C44424082336PF, 3600pF?, 3%, 1500V5. Adjust T103 so that DC voltage at pin 44 of
colour (RED, GREEN or BLUE) appears
C46324212222CD, 2200pF?, 10%IC501 becomes 3.2V ? 0.5V.
C80124082363PE, 0.22?F,? 20%, AC250V1. Connect an accurate high voltage meter toslightly on the screen.
C80224094656CD, 2200pF?, 20%, AC400V
C80324094656CD, 2200pF?, 20%, AC400Vthe second anode of the picture tube. Set the SCREEN Control to this position.After completing the above steps, disconnect
R32724339569ME, 5.6 ohm, 2W2. Turn on the receiver. Set the BRIGHTNESS7. Adjust the CUT OFF Controls to obtain thethe equipment and re-solder the links on the
R44424338398ME, 0.39 ohm, 1W
Main Board, and adjust the AGC Delay control
R44824338338ME, 0.33 ohm, 1Wand CONTRAST Controls to minimum (zeroslightly lighted horizontal lines in the same
R80124009954Metal-Glazed Resistor, 2.2M ohm, 1/2W(R151) following DELAYED RF AGC ADJUST-beam current).levels of three colours (RED, GREEN and2-2. How to Exit from the ServIce Mode
R84424005007Metal-Glazed Resistor, 8.2M ohm, 1WMENTS.
R89024019340PTC Thermistor, 18 ohm, 290V3. High voltage will be measured below 31.5kVBLUE)..
R92024000568FR, 4.7 ohm, 1WThe lines may look like white if the CUT OFFExit the service mode by turning the power on/
4. Change the BRIGHTNESS Control to both
L462------------DY, Supplied with V901
L90123200205Coil, Degaussing, TSB-2333ARextremes to be sure the high voltage does notControls are adjusted properly.off with the remote control.
T40123224983Transformer, Horiz. Drive, TLN1039exceed the limit of 29.0 kV under any8. Return the CUT OFF SW. (S202) in the
T46123236464Transformer, Flyback, TFB41 23AR
T80123211858Line Filter, TRF3139conditions.receiving position.3. ADJUSTMENT IN THE SERVICE MODE
T80323217240Transformer, Converter, TPW3301AR9. Set the BRIGHTNESS Control to the maxi-
Q40423314375Transistor, ON4409(508D)
Q826A8643108Photo Coupler, TLP621(GR-LFHEIGHT ADJUSTMENTmum and COLOUR Control to the centre.Service Mode Level Adjustments
Q83523318299IC, L78MR05
10.Set the BRIGHTNESS and CONTRAST1) Push + key (simultaneous push) to
F80123144898Fuse, 3.15A
F80323144875Fuse, 0.63A1. Receive the WG PHILIPS pattern, and set theControls to obtain dark grey raster. Thenappear Mode Data to be adjusted.
P80123372012Power Cord
contrast and colour to minimum, and thecheck the white balance in low brightness. If2) Adjust with the level UP/DOWN (VOL UP/
S80123145434Switch, Power, 2C2P
V90123312670Picture Tube, A51EAL155X01brightness to centre.the white balance is not proper, retouch theDOWN) key.
V901A23902891Socket, CRT, 10P
Safety Instructions / Safety Parts / Service Adjustments / Main Diagram / Main Diagram Contd |
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