2550TB Ch. C4E-R SAA5290ZP_032 = P83C055_BBP_158.pdf part of TOSHIBA 2550TB 2550TB Ch. C4E-R SAA5290ZP_032 = P83C055_BBP_158.part1.rar, Shematics and Service Mode text manual preview

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TOSHIBA 2550 TB
General Information C4E-R Chassis Recommended Safety Parts
Item
C440 C441 C443 C444 C463 C801 C802 C803 C807 C808 L462 L901 T461 Q404 F801 F803 P801 S801 V901A ZP30 ZP40 ZP80 ZP90 V901

2. Set the contrast and colour to minimum, and the brightness to centre. 3. Adjust H. CENTER SUB Control (R451) so the pattern can be located for d-c to be + 4.0 mm.

Part No.
24082583 24214221 24214221 24082517 24212222 24082363 24094656 24094656 24092281 24092281 -------- 23200275 23236454 A6872801 23144898 23144874 23372012 23145434 23902891 23144450 23144451 23144450 23144452 23312643

Description
PF, 7200pF, ±3%, 1500V CD, 220pF, ±10%, 500V CD, 220pF, ±10%, 500V PF, 5100pF, ±3%, 1800V CD, 2200pF, ±10% PF, 0.22µF, ±20%, AC250V CD, 2200pF, ±20%, AC400V CD, 2200pF, ±20%, AC400V CD, 4700pF, ±20%, AC250V CD, 4700pF, ±20%, AC250V DY, Supplied with V901 Coil, Degaussing, TSB-2329BR Transformer, Flyback, TFB4117AR Transistor, 2SD2253(FA) Fuse, 3.15A Fuse, 0.8A Power Cord Switch, Power, 2C2P Socket, CRT, 10P Protector, PRF2000, 125V, 2A Protector, PRF5000, 125V, 5A Protector, PRF2000, 125V, 2A Protector, PRF1000, 125V, 1A Picture Tube, A59TMZ40X06

5. Watching the picture well, adjust the SUBBRIGHT. Control in the position where the picture does not show evidence of blooming in high bright area and not appear too dark in low bright portion. 6. Check the proper picture variation by rotating the CONTRAST and BRIGHTNESS Controls to both extremes. 7. If the picture does not appear dark with the CONTRAST and BRIGHTNESS Controls turned to the minimum, or not appear bright with the controls turned to the maximum, adjust the SUB-BRIGHT. Control again for the acceptable picture. Figure 4. Picture IF Alignment 1. In the TV set of initial lot of production, SAA5290ZP/024 is used for QA01. But replace with SAA5290ZP/032 for servicing. 2. When QA01 only is replaced, it is not necessary to change the mode data. 3. When memory IC (QA02) is replaced, change the mode data in the manner below. 1. OUTLINE In the service mode, MODE DATA adjustments can be made easily with user remote control unit. (CT-9689 only) 2. SERVICE MODE OPERATION 2-1. How to Enter the Service Mode

FOCUS ADJUSTMENT Adjust FOCUS Control on FLYBACK TRANS. (T461) for well defined scanning lines in the centre area on the screen. DELAYED R-F AGC ADJUSTMENT 1. Tune the set in the strongest station in your area. 2. Turn AGC DELAY Control (R151) on MAIN Board to fully counterclockwise position. 3. Adjust AGC DELAY Control clockwise until noise (snow) disappears on the screen. CRT GREY SCALE ADJUSTMENT 1. Press VIDEO INPUT button on Remote Control unit to turn TV to video input mode. (Video input should have no signal.) Next press PICTURE SELECT button to select function and set CONTRAST to minimum, BRIGHTNESS to maximum, COLOUR to minimum. 2.Turn the SCREEN Control (on T461) fuly counterclockwise. 3. Set the RED, GREEN and BLUE CUT OFF Controls (R557, R558, R559) counterclockwise to the centre position. 4. Set the GREEN and BLUE DRIVE Controls (R252, R253) to the centre position. 5. Set the CUT OFF SW. (S202) in the H. line position. 6. Set the SUB BRIGHTNESS Control to minimum. 7. Rotate the SCREEN Control gradually clockwise until the first horizontal line of a colour (RED, GREEN or BLUE) appears slightly on the screen. Set the SCREEN Control to this position. 8. Adjust the CUT OFF Controls to obtain the slightly lighted horizontal lines in the same levels of three colours (RED, GREEN and BLUE). The lines may look like white if the CUT OFF Controls are adjusted properly. 9. Return the CUT OFF SW. (5202) in the receiving position. Press VIDEO INPUT button to turn TV to the TV mode. 10.Set the BRIGHTNESS Control to the maximum and COLOUR Control to the centre. 11.Adjust the BLUE and GREEN DRIVE Controls (R252/R253) to obtain proper whitebalanced picture in high light areas. 12.Set the BRIGHTNESS and CONTRAST Controls to obtain dark grey raster. Then check the white balance in low brightness. If the white balance is not proper, retouch the CUT OFF Controls and DRIVE Controls to obtain a good white balance in both low and high light areas. SUB-BRIGHTNESS ADJUSTMENT 1. Tune in a colour programme of Philips pattern. 2. Set the CONTRAST Control to the minimum and the BRIGHTNESS Control to the centre. 3. Set the COLOUR Control to the minimum. 4. Set the SUB-BRIGHT. Control (R551) so that the voltage across terminals Y-Z can be 0.2 + 0.05V with voltmeter and leave the receiver for five minutes in this state.

STEP Detector Coil SIGNAL GENERATOR 39.5 MHz CARRIER WAVE (Level 75 dBµ) ADJUST T103 REMARKS 1. Supply external DC power (+ 5V) to 5V-1 line. 2. Supply + 8V to pin 36 of 1C501. 3. Supply external DC power to + 12V line. 4. Apply test signal to IF input. 5. Adjust T103 so that DC voltage at pin 44 of IC501 becomes 3.2V ± 0.5V. After completing the above steps, disconnect the equipment and re-solder the liniks on the Main Board, and adjust the AGC Delay Control (R151) following DELAYED RF AGC ADJUSTMENTS.

X-Ray Note
X-RAY RADIATION PRECAUTION 1. The E.H.T. must be checked every time the receiver is serviced to ensure that the C.R.T. does not emit X-ray radiation as result of excessive E.H.T. voltage. The nominal E.H.T. for this receiver is 26.3 kV at zero beam current (minimum brightness) operating at 240V a.c. The maximum E.H.T. voltage permissible in any operating circumstances must not exceed 27.5 kV. When checking the E.H.T., use the `High Voltage Check' procedure in this manual using an accurate E.H.T. voltmeter. 2.The only source of X-RAY radiation in this receiver is the C.R.T. To prevent X-ray radiation, the replacement C.R.T. must be identical to the original fitted as specified in the Parts List. 3.Some components used in this receiver have safety related characteristics preventing the C.R.T. from emitting X-ray radiation. For continued safety, replacement component should only be made after referring the Product Safety Notice. 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 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 27.5 kV. 4. Rotate the BRIGHTNESS Control to both extremes to be sure the high voltage does not exceed the limit of 27.5 kV under any conditions. HORIZONTAL CENTRE ADJUSTMENT 1. Receive the WG PHILIPS pattern, and set the contrast and colour to minimum, and the brightness to centre. 2. Adjust HEIGHT Control (R351) so that white blocks at top and bottom of the picture are just masked. FOCUS ADJUSTMENT Adjust FOCUS Control on FLYBACK TRANS. (T461) for well defined scanning lines in the centre area on the screen. 1. Receive the WG PHILIPS pattern.

2-2. How to Exit from the Service Mode Exit the service mode by turning the power on/ off with the remote control. 3. ADJUSTMENT IN THE SERVICE MODE Service Mode Level Adjustments 1) Push F + key (simultaneous push) to Mode Data to be adjusted. 2) Adjust with the level UP/DOWN (VOL UP/ DOWN key) key.

Example of screen display in level adjustment. GENERAL: Refer to figure 4 for test equipment connection. PRELIMINARY STEPS: Supply +5 volts to the 5V-1 line. SIGNAL GENERATOR: Connect to both leads of R101 with signal level of 75 dBµ, and open the solder-link at IF OUT of tuner on the Main Board. (See figure 4.) DVM Connect to pin #44 of IC501 on the Main Board through the detector.