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ORDER NO. MTV0701520CE Colour Television TX-21GX20R-IRAN GL1 Chassis Specifications Power Source : AC SINGLE 220-240V, 50/60 Hz 1.0 Vp-p, 75Ω Power Consumption : 0.7 Vp-p, 75Ω Aerial Impedance : 75Ω unbalanced 0.7 Vp-p, 75Ω Coaxial type AV 1, 2 Receiving System :...
TX-21GX20R-IRAN 1 Safety Precautions 1.1. General Guide Lines 1. It is advisable to insert an isolation transformer in the AC supply before servicing this hot chassis. 2. When servicing, observe the original lead dress, especially the lead dress in the high voltage circuits. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit.
TX-21GX20R-IRAN 2 Service Hints 2.1. Service Position for E-Board 1. Remove the back cover. 2. Stand the TV set as shown in Fig. 2. 3. Remove the A-Board from the TV set by pulling the main board out as shown in Figure 2.
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TX-21GX20R-IRAN d. After selecting the required option mode press Vol up / Vol down to adjust correct option. OSD will change to RED colour. Press digit “0” to memorize data. e. CHK2 Press digit key “2” to move forward to CHK2.
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TX-21GX20R-IRAN j. Press digit key “4” to move forward from V-SLOPE ------> V-SHIFT Press digit key “3” to move backward from V-SHIFT ------> V-SLOPE k. Press volume up / volume down to adjust required setting. l. CHK4 Press digit key “2” to move forward to CHK 4.
TX-21GX20R-IRAN 2.3. Adjustment for White Balance Preparation: 1. Receive the white balance pattern and aging should have been performed over 30 minutes. 2. Set the picture menu to DYNAMIC NORMAL. 3. Degausse the CRT face. 4. Fix the CRT colour analyzer receiver unit to CRT face.
TX-21GX20R-IRAN 2.5. Adjustment Procedure 2.5.1. +B Voltage Item / preparation 1. Operate the TV set. 2. Set control as follows : Brightness ... minimum Contrast ....minimum Adjustment procedure 1. Confirm the DC voltage at the indicated test points, as follows : TPA 114 : 1.8 ±...
TX-21GX20R-IRAN 2.6. Adjustment Before Colour Purity, Convergence and White Balance adjustment are attempted, V. Height, H. Centre and Focus adjustments must be completed. Colour Purity Convergence 1. Set the Brightness and Contrast controls to their maximum 1. Apply a crosshatch pattern signal and Normalize Contrast positions.
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TX-21GX20R-IRAN Adjustment of CRT VRS 1. Preparation a. Set DY to CRT not to tilt up and down left and right deflection. b. Set CY to CRT and set CY magnet primarily (Fig. 1) Purity magnet : Set purity magnet that 2 magnets are (TOP POSITION) VRS magnet : Set purity magnet 2 magnets are (HORIZONTAL POSITION) 2.
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TX-21GX20R-IRAN Fig. 10 Fig. 11 Notes: 1. Wedge A, B and C should be inserted following the sequence of 1, 2 and 3 shown in Fig. 11. 2. The wedges should be set 120° apart from each other. 3. Be certain that three wedges are firmly fixed and the Deflection Yoke is tightly clamped in place.
TX-21GX20R-IRAN 6.1. Replacement Parts List Ref. Part No. Part Name & Description Remarks C503 F1B2H821A025 C 820PF, 500V Ref. Part No. Part Name & Description Remarks C504 ECJ1VB1H681K C 680PF, K, 50V C506 F1A2H1000002 C 10PF, 500V A51LYZ395X62 C511 ECA1VM101B...
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TX-21GX20R-IRAN Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C830 F0A1H182A040 P 1800PF, 50V D864 B0BA03300030 DIODE C840 F1A2E102A001 C 1000PF, M, D865 B0BA3R500008 DIODE C841 ECKW3D151KBR C 150PF, K, 2KV D872...
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TX-21GX20R-IRAN Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R006 ERJ3GEYJ273 M 27KOHM,J,1/16W R351 ERJ6ENF1001 M 1KOHM, 1/10W R007 ERJ3GEYJ392 M 3.9KOHM,J,1/16W R352 ERJ6ENF1001 M 1KOHM, 1/10W R008 ERJ3GEYJ681 M 680OHM,J,1/16W R353...
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TX-21GX20R-IRAN Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R663 ERJ3GEYJ121 M 120OHM,J,1/16W JSA3133 ERJ3GEY0R00 M 0OHM,J,1/16W R664 ERJ3GEYJ332 M 3.3KOHM,J,1/16W JSA3136 ERJ3GEY0R00 M 0OHM,J,1/16W R665 ERJ3GEY0R00 M 0OHM,J,1/16W JSA3141 ERJ3GEY0R00 M 0OHM,J,1/16W...
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