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KV-T25SN81

RM-870

SELF DIAGNOSIS FUNCTION

If no acknowledgement is returned from a device which is turned "ON", the device has a problem.

In this case, one of the LED's responding to the problem device will flicker a defined number of times.

Flickering is operated by lighting the LED's for 60ss each time.

The flickering frequency responding to each failed device is shown below.

All the devices are checked one after another from the left of the table.

If an error is found, the responding LED will start flickering.

So, if more than 1 device have failed, only the one on the left side will flicker.

Device

Flickering

Frequency

NONVOLATILE

MEMORY

1

Y/C JUNGLE

(IC300)

3

TONE

CONTROL

(IC201)

6

Summary of Contents for TRINITRON KV-T25SN81

Page 1: ...MODEL COMMANDER DEST CHASSIS NO KV T25SN81 RM 870 New Zealand SCC K37F A SERVICE MANUAL MODEL COMMANDER DEST CHASSIS NO CHASSIS TRINITRON COLOR TV BG 1S ...

Page 2: ...utputs Headphone jack minijack MONITOR OUT jacks phono jacks Video 1 Vp p 75 ohms Audio 500 mVrms Picture tube 25 in Tube size cm 64 Measured diagonally Screen size cm 60 Measured diagonally Dimensions w h d mm 613 542 472 Mass kg 32 Design and specifications are subject to change without notice CAUTION SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND THE ANODE CAP TO THE METAL CHASSIS CRT SHIELD O...

Page 3: ... Screen and White Balance Adjustments 17 4 CIRCUIT ADJUSTMENTS 4 1 Adjustments with Commander 18 4 2 Adjustment Method 19 4 3 A Board Adjustment after IC003 Memory Replacement 22 4 4 Picture Distortion Adjustment 22 5 DIAGRAMS 5 1 Block Diagram 25 5 2 Circuit Boards Location 29 5 3 Schematic Diagrams and Printed Wiring Boards 29 1 Schematic Diagram of A Board 33 2 Schematic Diagrams of A3 F1 and V...

Page 4: ...Flickering is operated by lighting the LED s for 60ss each time The flickering frequency responding to each failed device is shown below All the devices are checked one after another from the left of the table If an error is found the responding LED will start flickering So if more than 1 device have failed only the one on the left side will flicker Device Flickering Frequency NONVOLATILE MEMORY 1...

Page 5: ...M 870 2 1 REAR COVER REMOVAL 2 3 F1 BOARD REMOVAL SECTION 2 DISASSEMBLY 2 Two screws BVTP 4 16 3 One screw BVTP 3 16 1 Two screws BVTP 4 16 2 2 A BOARD REMOVAL 2 4 SERVICE POSITION Lever Lever A board A board F1 board ...

Page 6: ...change with the new parts and fix them with screws BVTP respectively 2 5 1 REPLACEMENT OF MULTI BUTTON 2 5 2 REPLACEMENT OF POWER BUTTON AND LIGHT GUIDE 2 6 DEMAGNETIZATION COIL REMOVAL 3 Demagnetization coil 4 Tension spring Picture tube 2 DGC holder 1 DGC band Remove the claw Cut Light guide Power button Two screws BVTP 3 12 Two screws BVTP 3 12 ...

Page 7: ...face of anode caps with sharp shaped objects 2 Do not press the rubber too hard so as not to damage the inside of anode caps A metal fitting called the shatter hook terminal is built into the rubber 3 Do not turn the foot of rubber over too hard The shatter hook terminal will stick out or damage the rubber b b c Anode button REMOVAL OF ANODE CAP NOTE After removing the anode short circuit the anod...

Page 8: ...a d a c b d a b c d Fig 3 1 Neck assy G1 G2 G3 Preparation In order to reduce the influence of geomagnetism on the set s picture tube face it east or west Switch on the power and degauss with the degausser 3 1 BEAM LANDING 1 Input a white signal with the pattern generator Contrast Brightness 2 Position neck assy as shown in Figure 3 1 3 Set the pattern generator raster signal to a green raster 4 M...

Page 9: ... VR magnet so that the red green and blue dots converge on top of each other in the center of the screen The respective dot positions resulting from moving each magnet interact so be sure to perform adjustment while tracking Use the V STAT magnet to adjust the red green and blue dots so they coincide at the center of screen by moving the dots in the horizontal direction BMC Hexapole V STAT Purity ...

Page 10: ...tion Before starting this adjustment adjust the horizontal static convergence and the vertical static convergence 1 Slightly loosen the deflection yoke screws 2 Remove the deflection yoke spacer R G B R G B R G B R G B R G B R G B R G B R G B R G B R G B R G B R G B 3 Screen corner Convergence a d screen corner misconvergence b a c d Fix a Permalloy assy corresponding to the misconverged areas Per...

Page 11: ...he adjusted items again to confirm adjustments were made Item number Note Adjustment item Initial DATA 09 RDR 25 WHITE POINT R 0A GDR 20 WHITE POINT G 0B BDR 20 WHITE POINT B SERVICE MUTING 1 F DATA RDR Adjustment Item 09 Item number WRITE 1 F RDR 09 0 Executes the writing 3 4 G2 SCREEN AND WHITE BALANCE ADJUSTMENTS 1 G2 SCREEN ADJUSTMENT RV701 1 Set the PICTURE and BRIGHTNESS to normal 2 Put to V...

Page 12: ...ng 7 0 All the data becomes the values in memory 8 0 All user control goes to the standard state 5 0 Service data initialization Be sure not to use usually 2 0 Write 50Hz adjustment data to 60Hz or vice versa The screen display is 1 4 Select the adjustment item 3 6 Raise lower the data MUTING Writes 0 Executes the writing MUTING TEXT VIDEO HOLD TV TEXT CLR SELECT PIC MODE A B ENLARGE WAKE UP INDEX...

Page 13: ...th the MUTING button 5 Execute the writing with the 0 button The WRITE display will be changed to green SERVICE Use the same method for Items Number 00 4B Use 1 and 4 to select the adjustment item use 3 and 6 to adjust write with MUTING then execute the write with 0 WRITE WRITE GREEN 0C VSF 08 SERVICE 50 50 50 GREEN 0C VSF 08 Adjust with the 3 and 6 buttons Written with the MUTING Write executed w...

Page 14: ...0 NOISE CORING PEAK TDA8375A 18 PMX 00 3F 27 PICTURE MAX DATA TDA8375A 19 PMI 00 3F 05 PICTURE MIN DATA TDA8375A 1A SBR 00 7F 4B SUB BRIGHTNESS TDA8375A 1B SHU 00 0F 07 SUB HUE TDA8375A 1C SSH 00 03 01 TV VIDEO SUB SHARPNESS TDA8375A 1D SC1 00 3F 1F SUB COLOR LOWER TDA8375A 1E SC2 00 3F 0B SUB COLOR HIGHER TDA8375A 1F AIP 00 7F 3F ADJUSTMENT IF PLL TDA8375A 20 VZM 00 3F 19 VERTICAL ZOOM TDA8375A 2...

Page 15: ...er to table below OPTION 2 µ CON NOTE Standard Data Those are the standard data values written on the microprocessor Therefore the data values of the modes are stored respectively in the memory In case of a device replacement adjustment by rewriting the data value is necessary for some items 50 50 Hz data 60 60 Hz data Standard data listed on the adjustment item table are reference values therefor...

Page 16: ... IC003 MEMORY REPLACEMENT 1 Enter to Service Mode 2 Press commander buttons 5 and 0 Data Initialize and 2 and 0 Data Copy to initialize the data 3 Call each item number and check if the respective screen shows the normal picture In case some items are not well adjusted give them fine adjustment Write the data per each item number MUTING 0 4 Select item numbers 49 OP0 4A OP1 and 4B OP2 and respecti...

Page 17: ... 23 KV T25SN81 RM 870 MEMO ...

Page 18: ... 24 KV T25SN81 RM 870 MEMO ...

Page 19: ...119 25 RD9 1ES L2 DIODE D1NL20 EL1Z GP08D RGP02 17EL 6433 RD3 6M B2 RD5 6M B2 DA204K DAN202K DAP202K CATHODE ANODE 2 2 4 1 3 1 2 4 CATHODE ANODE CATHODE ANODE 3 1 2 1 3 2 3 1 2 1 3 2 3 1 2 1 3 2 3 1 2 1 3 2 ERD29 08J RU4AM T3 5P 6M CATHODE ANODE CATHODE ANODE GATE IC ST24C08FB6 8PIN CXA1110BS 30PIN CXP85224A 072S 64PIN P83C654FBP 540 40PIN SAA5281ZP E 52PIN TDA4665T V5 118 16PIN TDA8375A 56PIN TDA...

Page 20: ...X12 11 4 037 613 01 CUSHION SP 12 1 504 305 11 SPEAKER 5X12CM 13 4 038 987 11 CUSHION SPEAKER 14 4 043 388 01 SCREW STEP TAPPING 15 4 046 765 01 SCREW TAPPING 7 CROWN WASHER 16 8 733 255 05 PICTUTE TUBE M60KWL70X 17 8 451 404 42 DEFLECTION YOKE Y25GXAS 18 1 452 762 31 NECKASSEMBLY NA294 19 A 1342 396 A VM BOARD MOUNTED 20 A 1331 743 A C BOARD MOUNTED 21 4 046 600 11 SPACER DY 22 3 704 372 11 HOLDE...

Page 21: ... 35V C237 1 104 665 11 ELECT 100MF 20 16V C238 1 136 167 00 FILM 0 15MF 5 50V C239 1 104 665 11 ELECT 100MF 20 16V C240 1 136 167 00 FILM 0 15MF 5 50V C241 1 126 942 61 ELECT 1000MF 20 25V C242 1 163 021 91 CERAMIC CHIP 0 01MF 10 50V C243 1 128 551 11 ELECT 22MF 20 25V C244 1 126 942 61 ELECT 1000MF 20 25V C246 1 128 551 11 ELECT 22MF 20 25V C247 1 126 942 61 ELECT 1000MF 20 25V C253 1 104 665 11 ...

Page 22: ... CHIP 0 47MF 25V C1226 1 126 934 11 ELECT 220MF 20 16V C1228 1 164 346 11 CERAMIC CHIP 1MF 16V C1513 1 126 968 11 ELECT 100MF 20 50V CONNECTOR CN101 1 508 797 00 PIN CONNECTOR 4P CN102 1 564 508 11 PLUG CONNECTOR 5P CN103 1 564 509 11 PLUG CONNECTOR 6P CN106 1 770 747 11 CONNECTOR BOARD TO BOARD 12P CN111 1 564 505 11 PLUG CONNECTOR 2P CN251 1 564 507 11 PLUG CONNECTOR 4P CN601 1 580 843 11 PIN CO...

Page 23: ... 8 729 422 27 TRANSISTOR 2SD601A Q Q1203 8 729 422 27 TRANSISTOR 2SD601A Q Q1204 8 729 216 22 TRANSISTOR 2SA1162 G Q1205 8 729 216 22 TRANSISTOR 2SA1162 G Q1207 8 729 422 27 TRANSISTOR 2SD601A Q Q1208 8 729 422 27 TRANSISTOR 2SD601A Q Q1264 8 729 424 67 TRANSISTOR UN2216 Q1265 8 729 424 67 TRANSISTOR UN2216 Q1513 8 729 422 27 TRANSISTOR 2SD601A Q D860 8 719 911 19 DIODE 1SS119 25 D891 8 719 945 80...

Page 24: ...1 10W R116 1 216 081 00 RES CHIP 22K 5 1 10W R117 1 216 081 00 RES CHIP 22K 5 1 10W R118 1 216 081 00 RES CHIP 22K 5 1 10W R119 1 216 055 00 RES CHIP 1 8K 5 1 10W R120 1 216 109 00 RES CHIP 330K 5 1 10W R131 1 216 464 11 METAL OXIDE 18K 5 2W F R180 1 216 033 00 RES CHIP 220 5 1 10W R181 1 216 033 00 RES CHIP 220 5 1 10W R182 1 216 033 00 RES CHIP 220 5 1 10W R203 1 216 033 00 RES CHIP 220 5 1 10W ...

Page 25: ...1 10W R915 1 216 071 00 RES CHIP 8 2K 5 1 10W R1201 1 216 023 00 RES CHIP 82 5 1 10W R1202 1 216 049 91 RES CHIP 1K 5 1 10W R1203 1 216 089 91 RES CHIP 47K 5 1 10W R1204 1 216 089 91 RES CHIP 47K 5 1 10W R344 1 216 129 00 RES CHIP 2 2M 5 1 10W R351 1 216 001 00 RES CHIP 10 5 1 10W R355 1 216 001 00 RES CHIP 10 5 1 10W R356 1 216 049 91 RES CHIP 1K 5 1 10W R357 1 216 105 91 RES CHIP 220K 5 1 10W R3...

Page 26: ...RES CHIP 100 5 1 10W VARIABLE RESISTOR RV301 1 241 769 11 RES ADJ CARBON 470K SWITCH S601 1 571 433 31 SWITCH PUSH AC POWER S801 1 572 707 11 SWITCH LEVER S901 1 570 577 11 SWITCH PUSH S902 1 570 577 11 SWITCH PUSH S903 1 570 577 11 SWITCH PUSH S904 1 570 577 11 SWITCH PUSH S905 1 570 577 11 SWITCH PUSH SPARK GAP SG801 1 519 422 11 GAP SPARK SURFACE WAVE FILTER SWF401 1 577 169 12 SAWF TRANSFORMER...

Page 27: ...E BEAD FB1201 1 412 911 11 FERRITE 0UH FB1202 1 412 911 11 FERRITE 0UH FB1203 1 412 911 11 FERRITE 0UH FB1204 1 412 911 11 FERRITE 0UH FB1205 1 412 911 11 FERRITE 0UH FB1206 1 412 911 11 FERRITE 0UH FILTER FL1201 1 239 803 11 ENCAPSULATED COMPONENT IC IC1201 8 752 059 57 IC CXA1110BS IC1202 8 759 493 49 IC MSP3410D PP B4 IC1203 8 759 701 75 IC NJM7805FA CHIP CONDUCTOR JR1 1 216 295 91 SHORT 0 JR2 ...

Page 28: ...E 1SS119 25 D703 8 719 911 19 DIODE 1SS119 25 D707 8 719 911 19 DIODE 1SS119 25 D708 8 719 911 19 DIODE 1SS119 25 D709 8 719 911 19 DIODE 1SS119 25 D710 8 719 911 19 DIODE 1SS119 25 D711 8 719 911 19 DIODE 1SS119 25 D712 8 719 911 19 DIODE 1SS119 25 D716 8 719 911 19 DIODE 1SS119 25 D717 8 719 121 26 DIODE RD9 1ESL2 JACK J701 1 251 239 11 SOCKET CRT COIL L701 1 410 667 31 INDUCTOR 22UH TRANSISTOR ...

Page 29: ...K D06 8 719 914 43 DIODE DAN202K FERRITE BEAD FB01 1 410 397 21 FERRITE 1 1UH IC IC01 8 759 324 28 IC P83C654FBP 540 IC02 8 759 298 63 IC SAA5281ZP E CHIP CONDUCTOR JR02 1 216 295 91 SHORT 0 JR03 1 216 295 91 SHORT 0 JR04 1 216 295 91 SHORT 0 JR07 1 216 295 91 SHORT 0 JR08 1 216 295 91 SHORT 0 JR09 1 216 295 91 SHORT 0 COIL L01 1 410 464 11 INDUCTOR 3 3UH L03 1 410 464 11 INDUCTOR 3 3UH L04 1 410 ...

Page 30: ...RES CHIP 4 7K 5 1 10W R34 1 216 065 91 RES CHIP 4 7K 5 1 10W R35 1 216 065 91 RES CHIP 4 7K 5 1 10W R36 1 216 025 91 RES CHIP 100 5 1 10W R37 1 216 049 91 RES CHIP 1K 5 1 10W R38 1 260 095 11 CARBON 470 5 1 2W R41 1 216 063 91 RES CHIP 3 9K 5 1 10W R42 1 216 077 00 RES CHIP 15K 5 1 10W R43 1 216 295 91 SHORT 0 R44 1 216 083 00 RES CHIP 27K 5 1 10W R45 1 216 021 00 RES CHIP 68 5 1 10W R46 1 216 021...

Page 31: ...432 11 CARBON 18K 5 1 4W R1777 1 249 438 11 CARBON 56K 5 1 4W R1778 1 249 430 11 CARBON 12K 5 1 4W R1779 1 249 414 11 CARBON 560 5 1 4W R1780 1 249 418 11 CARBON 1 2K 5 1 4W R1781 1 249 410 11 CARBON 270 5 1 4W R1782 1 249 385 11 CARBON 2 2 5 1 4W F R1784 1 247 807 31 CARBON 100 5 1 4W R1785 1 249 400 11 CARBON 39 5 1 4W F R1786 1 249 435 11 CARBON 33K 5 1 4W R1787 1 249 429 11 CARBON 10K 5 1 4W R...

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