JVC-RX5052S-avr-sm维修电路原理图.pdf

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1、SERVICE MANUAL COPYRIGHT 2005 Victor Company of Japan, Limited No.MB352 2005/3 AUDIO/VIDEO CONTROL RECEIVER MB35220053 RX-5050B,RX-5052S TABLE OF CONTENTS 1PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、. . . . . . 1-3 2SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 3DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . 1-3 4ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 5TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、. . . . . . . . . . . . . 1-3 TA/NEWS/INFO DISPLAY MODE Area suffix B - U.K E - Continantal Europe EN - Northern Europe EV - Eastern Europe EX-5052S Area suffix E - Continantal Europe RX-5050B RadioFans.CN 收音机爱 好者资料库 1-2 (No.MB352) SPECIFICATION * Corresponding to Linear PCM, Dolby Digital, and DTS

5、Digital Surround (with sampling frequency -32 kHz, 44.1 kHz, 48 kHz) Designs and specifications are subject to change without notice. Amplifier Output PowerAt Stereo operationFront channels100 W per channel, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distor- tion (IEC26

6、8-3/DIN). At Surround operationFront channels100 W per channel, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distor- tion. Center channel100 W, min. RMS, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distortion. Surround channels100 W per channel, min. RM

7、S, driven into 8 , at 1 kHz with no more than 0.8% total harmonic distor- tion. AudioAudio Input Sensitivity/Impedance (1 kHz)CD, TAPE/CDR, VCR, TV SOUND, DVD : 220 mV/ 47 k Audio Input (DIGITAL IN)*Coaxial DIGITAL 1 (DVD) : 0.5 V(p-p)/75 Optical DIGITAL 2 (CD) : -21 dBm to -15 dBm (660 nm 30 nm) Re

8、cording Output LevelTAPE/CDR, VCR : 220 mV Signal-to-Noise Ratio (66 IHF/DIN)CD, TAPE/CDR, VCR, TV SOUND, DVD : 87 dB/ 62 dB Frequency Response (8 )CD, TAPE/CDR, VCR, TV SOUND, DVD : 20 Hz to 50 kHz (+1 dB, -3 dB) Equalization (5 bands)63 Hz, 250 Hz, 1 kHz, 4 kHz, 16 kHz : 8 dB (in 2 dB steps) Video

9、Video Input Sensitivity/Impedance : Composite video DVD, VCR : 1 V(p-p)/75 Video Output Level : Composite videoVCR, MONITOR OUT : 1 V(p-p)/75 SynchronizationNegative Signal-to-Noise Ratio45 dB FM tuner (IHF) Tuning Range87.50 MHz to 108.00 MHz Usable SensitivityMonaural17.0 dBf (1.9 V/75 ) 50 dB Qui

10、eting Sensitivity Monaural21.3 dBf (3.2 V/75 ) Stereo41.3 dBf (31.8 V/75 ) Stereo Separation at OUT (REC)35 dB at 1 kHz AM (MW) tuner Tuning Range522 kHz to 1 629 kHz General Power RequirementsAC 230 V , 50 Hz Power Consumption210 W (at operation) 1.5 W (in standby mode) Dimensions (W H D)435 mm 146

11、.5 mm 369.5 mm Mass7.5 kg RadioFans.CN 收音机爱 好者资料库 (No.MB352)1-3 SECTION 1 PRECAUTION Please refer to RX-5042S (No.MB185) about this section. SECTION 2 SPECIFIC SERVICE INSTRUCTIONS Please refer to RX-5042S (No.MB185) about this section. SECTION 3 DISASSEMBLY Please refer to RX-5042S (No.MB185) about

12、 this section. SECTION 4 ADJUSTMENT Please refer to RX-5042S (No.MB185) about this section. SECTION 5 TROUBLESHOOTING Please refer to RX-5042S (No.MB185) about this section. (No.MB352) AV ; ; ; ; ; ; S1 ; J/CB/E/EN/EVUS/UT (2.5A- 250V) R1,EP1 R211,R212 D222,D223 Q211 R221 UP/A NONE T202 470/25 NONEU

13、SEUSE GND * * QQT0433- 001QQT0434- 001 C101 USE USE USE QQT0281- 004 NONE QQT0281- 004 470/25 USE C209470/63470/63 R2012.74.75.65.6 C102 330P EASTERN EUROPE UP ; KOREA A B170 F205 F204 F202,F203 F201 QMF51U1- 6R3- J8 QMF51U1- 2R0- J8 QMF51W2- 2R5- J8 QMF51W2- 2R0- J8 QMF51E2- R10- J1 QMF51W2- 5R0- J

14、8 QMF51W2- 2R0- J8 QMF51W2- 2R5- J8 QMF51E2- R10- J1 J/CB/E/EN/EV/UP/AUS/UT 23.4V 0V NONE ; AUSTLARIA 330P 0.001 0.001 330P 330P NONE NONE 330P NONE 330P VS201 (J/C/B/E/EN/EV) NONE * * 0V 5.1V - 29.0V 23.4V 23.5V 4.5V S2 0V 0V 0V 0V NONE NONE S2 0V 24.1V 24.2V COM 0V 23V 0V 0V 0V 0V * 6.4V 5.8V 0V 4

15、.8V 0V NONE * * NONENONEUSE NONE NONENONE AC20.3V 0V AC20.3V - 15.0V - 15.0V (2A- 250V)(2A- 250V) (2.5A- 250V) * * (5A- 250V) * +B2 (2W) FRONT_A LVA10472- 1 SURR CENTER HP_L HP_R (1/4W) (2W) GND UNF.O.M.F. FL- B 5.6V 5.6V F1 - VPP F2 B+5V +B2 - B2 HP_R * HP_L UNF.O.M.F. T201 J/C U.S.A. SHEETCIRCUIT

16、DISCRIPTION 1 UNF.RES * 2 3 * * 5 6 F206,F207 QMF51U1- 5R0- J8QMF51W2- 5R0- J8QMF51W2- 5R0- J8 PRIMARY * CANADA U.K. CONTINENTAL EUROPE NORTHERN EUROPE VOLUME / REGULATOR / SOURCE SELECT IC SINGAPORE (5A- 125V)AUDIO AMP AUDIO / VIDEO SIGNAL INPUT TERMINAL TAIWAN (100mA- 250V) USER CONTROL KEYS / SYS

17、TEMCONTROL LSI / FL DISPLAY SURROUND IC / DIGITAL SIGNAL INPUT TERMINAL (5A- 250V) (100mA- 250V) NONEUSE C221NONENONENONEUSE * * (5A- 250V) LVA10472- 2 LVA10472- 3LVA10472- 4 (1/4W) LVA10464- 6 To FW303 (LVA10471- 2) To FW141 (LVA10471- 1) To CN491 (LVA10464- 1) To CN701 (LVA10464- 2) LVA10472- 8 LV

18、A10472- 1 TH.FUSE LVA10472- 2 UNF.M.F. (1/4W) LVA10472- 3 S4 S4 S3 S3 COM LVA10472- 4 LVA10464- 6 S2 S2 COM (100V) (100V) (100V) POWER TRANSFORMER UNF.RES (1/4W) D.GND A.GND LVA10472- 8 +B2 (2W) FRONT_A To CN151 (LVA10471- 1) SURR CENTER HP_L HP_R (1/4W) (2W) GND UNF.O.M.F. FL- B 5.6V 5.6V F1 - VPP

19、F2 B+5V +B2 - B2 HP_R To CN151 (LVA10471- 1) HP_L UNF.O.M.F. T201 UNF.RES * * (1/4W) To FW303 (LVA10471- 2) To FW141 (LVA10471- 1) To CN491 (LVA10464- 1) To CN701 (LVA10464- 2) TH.FUSE UNF.M.F. (1/4W) S3 S3 S2 S2 COM S1 (100V) (100V) (100V) POWER TRANSFORMER UNF.RES D.GND A.GND MAINS PLUG MAINS PLUG

20、 (SHEET 6) (SHEET 2) (SHEET 3) (SHEET 2) (SHEET 2) Standard schematic diagrams Primary section 2-3 SHEET 2 Parts are safety assurance parts. When replacing those parts make sure to use the specified one. MTZJ15C D1121 STK413- 430 IC102 ! 12345678910111213141516171819202122 STK412- 430 IC101 ! 181716

21、151413121110987654321 4700/63 C1113 4700/63 C1114 6800/71 C1112 6800/71 C1111 MTZJ15C D1122 MTZJ15C D1221 MTZJ15C D1222 33R1269 UNF 33R1241 UNF 33R1242 UNF 33 R1141 UNF 33R1142 UNF 0.45uL1269 0.45uL1241 0.45uL1242 0.45uL1141 0.45uL1142 1.5kR1223 OMF ! 1.5kR1224 OMF ! 1.5kR1123 OMF ! 1.5kR1124 OMF !

22、100/100 C1121 100/100 C1122 100/100 C1221 100/100 C1222 10R1243 OMF ! 10R1270 OMF ! 10R1244 OMF ! 10R1144 OMF ! 10R1143 OMF ! 0.047 C1142 0.047 C1144 0.047 C1143 0.047 C1141 QUM215- 25Z4Z4 FW301 1 2 3 4 5 QUM216- 25Z4Z4 FW302 1 2 3 4 5 6 QUM214- 26DGZ4 FW303 1 2 3 4 QQLZ005- R45 L1351 B1005 QQLZ005-

23、 R45 L1352 QQLZ005- R45 L1353 B1007 B1008 B1009 B1006 100p C1124 100p C1123 100p C1223 100p C1265 100p C1224 0.047 C1242 0.047 C1244 0.047 C1243 0.047 C1241 0.047 C1267 100kR1175 100 R1210 100k R1174 100kR1173 QQLZ005- R45 L1354 KTA1268/GL Q1185 QJP002- 021601 CN272 2 1 QJP001- 031001 CN273 3 2 1 0.

24、047 C1266 1kR1127 1kR1128 QQLZ005- R45 L1355 QSK0109- 001 RY303 1SS119D1352 1k R1102 1k R1101 750 R1106 UNF ! 750 R1105 UNF ! 33kR1109 100k R1108 100kR1107 100k R1104 100k R1103 100k R1208 100k R1204 62kR1264 62k R1262 300 R1263 UNF ! 100kR1207 1k R1202 1k R1201 1k R1261 100k R1203 QJP001- 032101 CN

25、171 3 2 1 3.3p C1107 3.3p C1108 470p C1101 470p C1102 470p C1201 3.3p C1264 470p C1202 470p C1261 3.3p C1208 100/10 C1205 100/10 C1206 100/10 C1263 PW601PW602 220/10 C1105 220/10 C1106 4.7/50 C1262 N 4.7/50 C1203 N 3.3p C1207 33k R1209 68R1352 UNF KTC3200/GL Q1131 QJK012- 051903 CN151 1 2 3 4 5 KTC3

26、200/GL Q1171 82kR1172 100kR1171 QSK0109- 001 RY302 QNB0188- 001 ST301 0.22 R1226 FMR ! 0.22 R1225 FMR ! 0.22 R1265 FMR ! 0.22 R1126 FMR ! 0.22 R1125 FMR! QSK0109- 001 RY304 1SS119 D1353 1SS119 D1354 470 R1121 UNF ! 470 R1122 UNF ! ! ! ! ! ! ! ! ! ! ! ! 470 R1221 UNF ! 470 R1222 UNF ! 1SS119 D1129 1S

27、S119 D1130 18k R1129 18k R1130 47k R1131 47k R1132 1k R1266 1k R1227 1k R1228 KTC3200/GL Q1261 KTC3200/GL Q1231 KTC3200/GL Q1232 47k R1268 47k R1231 47k R1232 18k R1267 18k R1229 18k R1230 1SS119 D1230 1SS119 D1229 1SS119 D1261 10k R1178 10k R1179 10/25 C1171 KTA1268/GL Q1172 KTC3199/GL Q1173 1SS119

28、 D1171 47/16 C1172 100k R1177 100k R1176 220p C1377 3.9 R1372 UNF 3.9 R1373 UNF 220p C1363 KTC3200/GL Q1132 4.7/50 C1103 N 0.047 C1361 220p C1364 68R1353 UNF 68R1354 UNF 0.047 C1362 3.9 R1374 UNF 220p C1366 220p C1373 220p C1374 0.047 C1370 0.047 C1369 0.047 C1365 220p C1376 220p C1375 220p C1372 22

29、0p C1371 220p C1368 220p C1367 220p C1359 2.2R1235 UNF ! 2.2 R1135 UNF ! 2.2R1137 UNF ! 100R1133 UNF ! 2.2 R1134 UNF ! 2.2 R1237 UNF ! 100R1233 UNF ! 2.2R1234 UNF ! 220p C1360 100KR1186 10KR1185 10/100 C1185 2.2 R1136 UNF ! 2.2R1236 UNF ! 3.9 R1370 UNF 4.7/50 C1104 N 3.9 R1371 UNF 1 2 3 4 5 6 1 2 3

30、4 5 750 R1206 UNF ! 750 R1205 UNF ! 68R1191 UNF 5.6kR1192 UNF 47/50 C1191 220p C1378 UF304G- F82 D1101 ! MTZJ36C D1141 KTA1046/Y/ Q1175 QUM215- 16DGZ4 FW141 1 2 3 4 5 UF304G- F82 D1103 ! UF304G- F82 D1102! UF304G- F82 D1104 ! UF304G- F82 D1105! UF304G- F82 D1107 ! UF304G- F82 D1106! UF304G- F82 D110

31、8 ! 0.1/160 C1115 0.1/160 C1116 0.1/160 C1117 0.1/160 C1119 0.1/160 C1120 0.1/160 C1118 EP101 GND 4.7/50 C1204 N C1268 0.022 +VH - VH +VL - VL +VH +VH +VL +VL +COMPARATOR - COMPARATOR - COMPARATOR +COMPARATOR - VL - VL - VH - VH SUB GND SUB GND Rch +OUT Rch - OUT Lch - OUT Lch +OUT - PRE - PRE +PRE

32、+PRE Rch IN Rch NF BIAS BIAS Lch NF Lch IN SRch +OUT SRch - OUT SLch - OUT SLch +OUT SRch IN SRch NF SLch NF SLch IN Cch IN Cch NF Cch +OUT Cch - OUT LVA10471- 2 L HP_R * (1/4W) CENTER SURR R SURR L GND S1 * S2 S2 (2W) S1 GND GND (1W) (1W) (1/4W) (1/4W) (1/4W) (1W) (1W) (1/4W) (5W) (5W) (5W) (5W) (5

33、W) (2W)(2W)(2W)(2W) CchSLchSRch SPEAKER TERMINAL GND (1/4W) To CN203 (LVA10472- 1) (1/4W) To CN471 (LVA10464- 1) (1/4W) GND R LVA10471- 1 (1/4W) C SL SR +B2 FRONT_A To CN472 (LVA10464- 1) To CN473 (LVA10464- 1) To CN241 (LVA10472- 1) (1/4W) (1/4W) (1/4W) (1/4W) GND (1/4W) (1/4W) SURR CENTER HP_L (1/

34、4W) (1/4W) (1/4W) 0V 0V 0V 0V 0V 0V 24.5V 0V 24.5V 24.5V 2.3V 0V PROTECTOR_IN FL- B * * To CN251 (LVA10472- 1) 57.1V 27.5V 0V - 27.4V - 56.9V 57.1V 57.1V 13.0V 27.5V - 12.7V - 27.4V - 56.9V 0V 0V 0V 0V 0V 0V 0V 0V 0V - 55.5V - 56.4V (1/4W) (1/4W) (1/4W) (1/4W) 57.1V 27.5V 13.0V - 12.7V - 27.4V - 56.

35、9V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V - 56.4V 57.1V - 55.4V (1/4W) (1/4W) (1/4W) (1/4W) (1/4W) (1/4W) (1/4W) (1/4W) (1/4W) - 58.0V - 57.5V 4.9V 0V 0V0V 0V - 55.5V 0V 0V 0V 0V * * * * C1366 * C1367 * C1368 * * NONE * * * B1005 * B1006 B1007 B1008 B1009 L1351 L1352 L1353 L1354 L1355 R1370,R1371 *

36、* * * * * * * * * * * * * * * * * C1361,C1362 C1363,C1364 C1359,C1377 C1360,C1378 R1373,R1374 C1369,C1370 * C1373,C1374 C1372,C1375 C1371,C1376 R1372 C1365 J/C * MARK LIST A/UT/US /UP B/E/EN/EV NONE USE USE USE USE USE NONE NONE NONE NONE NONE NONE NONE NONE NONE NONE NONE USE USE USE USE USE USE NO

37、NE NONE NONE NONE NONE USE USE USE USE NONE USE USE NONE NONE NONE NONE NONE NONE USE USE USE USE USE USE USE USE USE USE USE USE NONE USE USE USE USE USE USE USE USE USE NONE NONE NONE NONE NONE FR (1/4W) (1/4W) - 25V USE USE USE * FL FR USE NONE USE A.GND A.GND A.GND COM LchRch L/Rch POWER AMP C/S

38、L/SRch POWER AMP (SHEET 1) (SHEET 3) (SHEET 3) (SHEET 3) (SHEET 1)(SHEET 1) Audio amp section 2-4 SHEET 3 Parts are safety assurance parts. When replacing those parts make sure to use the specified one. + - + - + - + - TU_CE TU_DATAIN VIDEO2 TU_DATAOUT D+5V SELF_DET VIDEO1 DBS VIDEO2 S_MUTE TU_MUTE

39、DSP_RESET DSP_READY DSP_CLK IN_L DSP_STATUS DSP_COMMAND VOL_CLK VOL_DA SW_MUTE SW_STB TU_CLK SW_CLK SW_DATA SW_STB VIDEO1 VCR DVD D.GND DSP_RESET A+12V S_MUTE DSP_READY DSP_COMMAND DSP_STATUS DSP_CLK DSP_C TU_CE DSP_L A+5V DSP_SR DSP_R DSP_SL DSP_SR DSP_LFE DSP_C DSP_LFE INPUT_ATT SW_CLK SW_DATA SW_

40、CLK S_MUTE SW_DATA INPUT_ATT BASSBOOST SW_MUTE SW_STB TU_DATAIN IN_R TU_CLK TU_DATAOUT TU_MUTE DSP_RDSP_L DSP_SL A- 12V VOL_DA VOL_CLK 68 R1460 FR EP401 GND QGB2510J1- 04CN491 1 2 3 4 KRA104M Q1423 2.7k R1409 UNF 68 R1459 FR 2SD2394/EF/ Q1404 2.7k R1404 UNF 4.7 R1410 UNF 1.8k R1411 MTZJ13C D1405 100

41、/25 C1405 2SD2394/EF/ Q1405 10 R1401 UNF 12 R1403 UNF MTZJ5.6C D1404 100/25 C1404 4.7/50 C1447 100/25 C1403 MTZJ5.6B D1403 2SD2394/EF/ Q1403 560 R1583 100/25 C1402 MTZJ6.2C D1402 QGB2510J1- 07 CN441 1 2 3 4 5 6 7 2SC3576- JVC Q1426 2SD2394/EF/ Q1402 2SC3576- JVC Q1425 0R0 R1571 470k R1500 2SC3576- J

42、VC Q1419 12 R1405 UNF 2SC3576- JVC Q1414 2SC3576- JVC Q1418 100k R1464 47/50 C1401 MTZJ13C D1401 1.8k R1402 UNF KTA1046/Y/ Q1401 2SC3576- JVC Q1417 2SC3576- JVC Q1413 0R0 R1572 1k R1492 6.8k R1406 UNF 0R0 R1575 0R0 R1576 300 R1579 4.7/50 C1424 4.7/50 C1423 0R0 R1580 BD3814FV IC428 21 22 23 24 25 26

43、27 28 29 30 31 32 33 34 35 36 37 38 39 40 20 19 18 17 16 15 14 13 12 11 10987654321 1k R1573 0.022 C1460 0.022 C1461 NJM4565M- WE IC427 2 3 1 4 NJM4565M- WE IC427 6 5 7 8 510 R1499 0.022 C1432 1k R1574 3.3k R1581 100k R1480 QGA2501C1- 03 CN473 1 2 3 4.7/50 C1422 4.7/50 C1459 4.7/50 C1453 100 R489 10

44、0 R490 - MA152WK- X D1409 2 1 3 1N4448WS- X D1412 QGB2510J1- 07 CN482 1 2 3 4 5 6 7 1N4448WS- X D1413 2SC3576- JVC Q1422 QGB2510J1- 11CN431 1 2 3 4 5 6 7 8 9 10 11 KTC3203/OY/ Q1407 KTA1271/OY/ Q1408 2.2k R1417 UNF QGB2510J1- 14 CN421 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1N4448WS- X D1414 1N4448WS- X D1

45、415 1.6k R1582 560 R1584 2SC3576- JVC Q1421 1k R1474 1k R1453 10k R1450 10k R1448 KRA104M Q1420 10k R1444 QGF1205C1- 27 CN402 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 QGA2501C1- 03 CN471 1 2 3 10 R1416 UNF 10/16 C1425 QGF1205C1- 11 CN411 1 2 3 4 5 6 7 8 9 10 11 10/50 C

46、1465 N 2SC3576- JVC- T Q1427 QQR1372- 001 FL401 123 46 1k R1445 200 R1470 100k R1446 5.6K R483 QGA2501C1- 02 CN472 1 2 47K R484 2K R485 200 R1471 10k R1473 47K R486 QQR1372- 001 FL402 123 46 2K R487 0.0056 C1439 10k R1472 2.2k R1415 UNF 1k R1413 UNF 47/25 C1409 47/25 C1408 0.0056 C1440 13k R1490 2SC

47、3576- JVC- T Q1428 10K R1487 10K R1488 KRA104M Q1429 10/16 C1433 QGB2510J1- 14 CN481 1 2 3 4 5 6 7 8 9 10 11 12 13 14 470/35 C1480 1k R1493 1k R1494 TC9162AF IC423 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1413121110987654321 150K R1436 150K R1435 1k R1438 1k R1437 10k R1440 10k R1439 MTZJ7.5C D1408

48、 MTZJ7.5C D1407 10 R1414 UNF KTC3203/OY/ Q1406 10k R1495 MTZJ10C D1406 100/25 C1406 6.8k R1458 0.022 C1436 6.8k R1457 1K R1485 1K R1486 1N4448WS- X D1411 QGA2001C1- 02 CN403 1 2 BU1924 IC431 8 91011121314 7654321 1516 100k R1452 100k R1451 82P C1470 47P C1471 10k R1496 KRA104M Q1424 330P C1475 510 R

49、1498 560P C1474 0.047 C1473 2.2/50 C1476 47K R488 16K R475 10K R476 10 R1412 UNF 10/16 C1472 QAX0263- 001Z X1401 2.2K R1475 1k R1449 1k R1447 1K R1478 1K R1477 0.001 C1477 2SD2394/EF/ Q1435 2SD2394/EF/ Q1434 4.7 R477 UNF 2.2 R479UNF 2.2 R478 UNF 2.2 R1462 UNF 2.2 R1461 UNF 4.7 R1407 UNF 4.7 R1408 UNF 68 R1419 FR 0.022 C1445 0.022 C1444 4.7/50 C1464 4.7/50 C1463 68 R1418 FR 0.022 C1407 1k R1465 220p C1446 1.5 C1437 R482 100K R481 100K IC422 2 3 1 4 IC422 6 5 7 8 C1414 4.7/50 C1413 4.7/50 R142410k