TX-21FJ70R 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-21FJ70R 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.
TX-21FJ70R 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-21FJ70R 2.5. Adjustment Procedure Item / Preparation Adjustment Procedure +B Voltage Confirm the DC voltage at the indicated test points, as follows : 1. Operate the TV set. TPD 15 : 3.3 ± 0.2V 2. Set control as follows : TPD 16 : 141 ±...
TX-21FJ70R 2.6. PAL Colour 1. Receive the PAL B/G studio colour bar pattern and adjust local frequency at the best tuned position. 2. Pic Menu: Dynamic Normal, Confirm Contrast - 100 DAC, Sub Contrast - 21 dac. 3. Channel colour set --------- STD 4.
Page 9
TX-21FJ70R 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.
Page 10
TX-21FJ70R 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.
Page 11
TX-21FJ70R 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-21FJ70R 6.1. Replacement Parts List Ref. No. Part No. Part Name & Description Remarks C2320 ECJ2VC1H102J C 1000PF, J, 50V C2321 ECJ2VC1H102J C 1000PF, J, 50V Ref. No. Part No. Part Name & Description Remarks C2322 ECJ2VC1H102J C 1000PF, J, 50V...
Page 29
TX-21FJ70R Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks C371 ECJ2VF1H222Z C 2200PF, Z, 50V C650 F2A1C101A159 E 100UF, 16V C372 ECJ2VF1H222Z C 2200PF, Z, 50V C652 F1J1H104A578 C 0.1UF, 50V...
Page 30
TX-21FJ70R Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks D1061 B3AGA0000089 DIODE IC604 C1AB00001992 D1132 MTZJ3.9A ZENER DIODE IC801 C5HABZZ00120 IC, POWER SUPPLY D2103 MA723 DIODE IC802 C0EAS0000026 D2104 MA723...
Page 31
TX-21FJ70R Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks Q2304 B1ADCF000077 TRANSISTOR R1115 ERJ6GEYJ101 M 100OHM,J,1/10W Q2305 B1ADCF000077 TRANSISTOR R1116 ERJ6GEY0R00 M 0OHM,J,1/10W Q2360 2SD0601A0L TRANSISTOR R1123 ERJ6GEY0R00 M 0OHM,J,1/10W...
Page 32
TX-21FJ70R Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks R303 ERJ6GEYJ103 M 10KOHM,J,1/10W R580 ERJ6GEYJ392 M 3.9KOHM,J,1/10W R3031 ERJ6GEYJ102 M 1KOHM,J,1/10W R581 ERJ6GEYJ563 M 56KOHM,J,1/10W R3039 ERJ6GEYJ681 M 680OHM,J,1/10W R585...
Page 33
TX-21FJ70R Ref. No. Part No. Part Name & Description Remarks Ref. No. Part No. Part Name & Description Remarks R855 ERJ6GEYJ222 M 2.2KOHM,J,1/10W JA28 ERJ6GEY0R00 M 0OHM,J,1/10W R863 ERDS2TJ221 C 220OHM,J, 1/4W ERJ6GEY0R00 M 0OHM,J,1/10W R864 ERJ6GEYJ103 M 10KOHM,J,1/10W ERJ6GEY0R00...