Beyerdynamic_NE100S_Receiver_Service_Manual 电路图.pdf

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1、SERVICE MANUAL TRUE DIVERSITY RECEIVER BEYERDYNAMICNE100S MIPROMR-518 ：： Date: APR.15.2003 Version: 1PR020A RadioFans.CN 收音机爱好者资料库 SPECIFICATIONS FOR NE100S RECEIVER ITEM SPECIFICATIONS 1. FREQUENCY RANGE 174.0 216.0MHz 2. FREQUENCY STABILITY 0.005% 0 +50 3. SENSITIVITY +12 dBV FOR 80dB S/N 4. IMA

2、GE REJECTION 63dB 5. SPURIOUS REJECTION 80dB 6. INTERMODULATION REJECTION (S/N:30dB THREE SG MODE) 63dB 7. ADJACENT CHANNEL REJECTION (WHEN MISTUNED BY 350KHz) 80dB 8. SPURIOUS EMISSIONS 1.3V 4 SQUELCH SG12dBV AF LED CHAVR4 CHBVR3 SG2dB AF LED just light 5 AUDIO LEVEL SG60dBV AFG400Hz audio analyzer

3、 J6 CHAVR1 CHBVR2 870mV 20mV 6 THD SG60dBV AFG400KHz audio analyzer J6 CHAL11 CHBL11 0.5% 7 AUDIO FREQUENCY RESPONSE SG60dBV AFG10KHz audio analyzer J6 -22dB 2dB 8 AF LEVEL METER SG60dBV DEF13KHz AFG400Hz AF LED AF LED BRIGHT 2K DEF 9 RF LEVEL METER SG60dBV AFG400Hz RF LED VR5 RF LED BRIGHT 2 dB 10

4、BALANCE LEVEL SG60dBV AFG400Hz audio analyzer J5 300mV 15mV 11 TONE “ON” SG2.5K DEF AF LED TONE L23 2.5K DEF AF LED just light 12 TONE “OFF” SG1.5K DEF AF LED 1.5K DEF RF LED just snuff 13 S/N-RATIO SG60dBV DEF15KHz AFG400Hz audio analyzer J6 100dB S/N 14 Sensitivity SG12dBV DEF15KHz AFG400Hz audio

5、analyzer J6 80dB S/N 15 CURRENT CONSUMPTION DC power supply12V 1A current meter P1 250mA 30mA 16 NOISE SQ SG12dBV AF LED VR10 AF LED just light 17 MAKE LEVEL SG60dBV AFG400Hz SW1LOW audio analyzer J6 90mV 15mV R518R03B SERVICE / TECHNICAL MANUALS PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S

6、CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value C1 C1 C1 C2 C2 C2 C3 C3 C3 C4 C4 C4 C5 C5 C5 C6 C6 C6 1CCS6X103 C7 103P 1CCS6X103 C8 103P 1CCS6X103 C9 103P C10 C10 C10 C11 C11 C11 1CCS6X103 C12 103P 1CCS6P000 C13 0.5P 1CCS6P000 C14 0.5P C15 C15 C15 C16 C16 C16 C17 C17 C17 C18 C18 C18 1CCS6X10

7、3 C19 103P 1CCS6X103 C20 103P 1CCS6X103 C21 103P 1CCS6X103 C22 103P 1CCS6X223 C23 223P 1CCS6X223 C24 223P 1CCS6X223 C25 223P 1CCS6X223 C26 223P 1CCS6X103 C27 103P 1CCS6X223 C28 223P 1CCS6P101 C29 100P 1CTSBA105 C30 1uF/16V 1CTSBA225 C31 2.2uF/16V 1CCS6X223 C32 223P PART LIST PART LIST DATE：May.20 20

8、02 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value 1CCS8S056 C33 56P(N750) 1CTSAA106 C34 10uF/10V 1CCS6X103 C35 103P 1CTSBA105 C36 1uF/16V 1CCS6X103 C37 103P 1CCS6X223 C38 223P 1CCS6X102 C39 102P 1CCS6P101 C40 100P 1CCS6P101 C41 100P 1CCS6P033 C42 33P 1CCS6P033 C43 3

9、3P 1CTSAA475 C44 4.7uF/10V 1CTSAA475 C45 4.7uF/10V 1CTSAA475 C46 4.7uF/10V 1CTSAA475 C47 4.7uF/10V 1CTSAA475 C48 4.7uF/10V 1CCS6P015 C49 15P 1CTSBA105 C50 1uF/16V 1CTSDA474 C51 0.47uF/35V 1CTSAA475 C52 4.7uF/10V 1CCS6X103 C53 103P 1CCS6X103 C54 103P C55 C55 C55 C56 C56 C56 C57 C57 C57 C58 C58 C58 C5

10、9 C59 C59 C60 C60 C60 1CCS6X103 C61 103P 1CCS6X103 C62 103P 1CCS6X103 C63 103P C64 C64 C64 PART LIST PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value C65 C65 C65 1CCS6X103 C66 103P 1CCS6P000 C67 0.5P 1CCS6P000 C68 0.5P C69 C69 C69 C70 C70 C7

11、0 C71 C71 C71 C72 C72 C72 1CCS6X103 C73 103P 1CCS6X103 C74 103P 1CCS6X103 C75 103P 1CCS6X103 C76 103P 1CCS6X223 C77 223P 1CCS6X223 C78 223P 1CCS6X223 C79 223P 1CCS6X223 C80 223P 1CCS6X103 C81 103P 1CCS6X223 C82 223P 1CCS6P101 C83 100P 1CTSBA105 C84 1uF/16V 1CTSBA225 C85 2.2uF/16V 1CCS6X223 C86 223P

12、1CCS8S056 C87 56P(N750) 1CTSAA106 C88 10uF/10V 1CCS6X103 C89 103P 1CTSBA105 C90 1uF/16V 1CCS6X103 C91 103P 1CCS6X223 C92 223P 1CCS6X102 C93 102P 1CCS6P101 C94 100P 1CCS6P101 C95 100P 1CCS6P033 C96 33P PART LIST PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer N

13、o. Reference Value 1CCS6P033 C97 33P 1CTSAA475 C98 4.7uF/10V 1CTSAA475 C99 4.7uF/10V 1CTSAA475 C100 4.7uF/10V 1CTSAA475 C101 4.7uF/10V 1CTSAA475 C102 4.7uF/10V 1CCS6P015 C103 15P 1CTSBA105 C104 1uF/16V 1CTSDA474 C105 0.47uF/35V 1CTSAA475 C106 4.7uF/10V C107 C107 C107 C108 C108 C108 1CCS6X103 C109 10

14、3P C110 C110 C110 C111 C111 C111 1CCS6P000 C112 0.5P C113 C113 C113 1CCS6X103 C114 103P 1CCS6X103 C115 103P 1CCS6X103 C116 103P 1CCS6X103 C117 103P 1CCS6X102 C118 102P 1CCS6X102 C119 102P 1CTSBA225 C120 2.2uF/16V 1CTSBA225 C121 2.2uF/16V 1CTSBA225 C122 2.2uF/16V 1CTSAA475 C123 4.7uF/10V 1CCS6X473 C1

15、24 473P 1CCS6X473 C125 473P 1CTSAA475 C126 4.7uF/10V 1CCS6X223 C127 223P 1CTSDA474 C128 0.47uF/35V PART LIST PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value 1CCS6X102 C129 102P 1CTSAA475 C130 4.7uF/10V 1CTSAA106 C131 10uF/10V 1CCS6X103 C132

16、 103P 1CCS8Y104 C133 104P(0805) 1CCS6X473 C134 473P 1CCS6X473 C135 473P 1CCSCP332 C136 332P(1206) 1CCS6X102 C137 102P 1CCS6X473 C138 473P C139 C139 C139 1CCS6X472 C140 472P C141 C141 C141 1CTSAA475 C142 4.7uF/10V C143 C143 C143 1CMNP3300 C144 332P(PS) 1CCS6X472 C145 472P 1CTSDA474 C146 0.47uF/35V 1C

17、TSDA474 C147 0.47uF/35V C148 C148 C148 C149 C149 C149 1CCS6P047 C150 47P 1CTSBA225 C151 2.2uF/16V 1CTSAA475 C152 4.7uF/10V 1CTSAA475 C153 4.7uF/10V 1CTSAA475 C154 4.7uF/10V 1CTSBA225 C155 2.2uF/16V 1CCS6P047 C156 47P 1CCSCP332 C157 332P(1206) 1CTSAA475 C158 4.7uF/10V 1CTSAA475 C159 4.7uF/10V 1CTSBA2

18、25 C160 2.2uF/16V PART LIST PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value 1CTSAA475 C161 4.7uF/10V 1CTSBA225 C162 2.2uF/16V 1CTSDA474 C163 0.47uF/35V 1CCS8X103 C164 103P(0805) 1CTSAA475 C165 4.7uF/10V 1CCS6P068 C166 68P 1CCS8P102 C167 102

19、P(0805) 1CTSAA475 C168 4.7uF/10V 1CTSAA475 C169 4.7uF/10V 1CTSAA475 C170 4.7uF/10V C171 C171 C171 1CTSAA106 C172 10uF/10V 1CCS6P101 C173 100P 1CTSBA225 C174 2.2uF/16V 1CTSAA106 C175 10uF/10V 1CTSAA475 C176 4.7uF/10V 1CCS6P101 C177 100P 1CTSAA106 C178 10uF/10V 1CTSAA106 C179 10uF/10V 1CTSAA106 C180 1

20、0uF/10V 1CENEA107 C181 100uF/50V 1CENEA107 C182 100uF/50V 1CCS8Y104 C183 104P(0805) 1CCS6X103 C184 103P 1CENCA226 C185 22uF/25V 1CCS8Y104 C186 104P(0805) 1CENEA107 C187 100uF/50V 1CCS8Y104 C188 104P(0805) 1CENEA107 C189 100uF/50V 1CCS8Y104 C190 104P(0805) 1CENAA478 C191 4700uF/10V 1CCS8Y104 C192 104

21、P(0805) PART LIST PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value 1CTSBA225 C193 2.2uF/16V C194 C194 C194 1CTSAA475 C195 4.7uF/10V 1CCS6P331 C196 330P 1CCS6P151 C197 150P 1CCS6P151 C198 150P 1CCS6P033 C199 33P 1CTSAA475 C200 4.7uF/10V 1CTSA

22、A106 C201 10uF/10V 1CTSAA475 C202 4.7uF/10V 1CCS6X473 C203 473P 1CCS6X473 C204 473P 1CCS6X473 C205 473P 1CCS6X103 C206 103P 1CTSBA225 C207 2.2uF/16V 1CCS6P331 C208 330P 1CCS6P151 C209 150P 1CCS6P151 C210 150P C211 C211 C211 C212 C212 C212 C213 C213 C213 1CCS6P101 C214 100P 1CCS6P101 C215 100P 1CCS6P

23、101 C216 100P 1FNC0002 F1 E10.7MJA 1FNC0002 F2 E10.7MJA F3 F3 F3 1FNC0002 F4 E10.7MJA 1FNC0002 F5 E10.7MJA F6 F6 F6 1FNC0001 F7 CDA10.7MA 1FNC0001 F8 CDA10.7MA PART LIST PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value 1FNC0007 F9 MPX FILTER

24、 1MPT0001 J1 TNC JACK 1MPT0001 J2 TNC JACK J3 J3 J3 J4 J4 J4 1MPC0001 J5 BAL JACK 1MPA0001 J6 PHONE JACK J7 J7 J7 1MPR0002 J8 RF JACK 1MPR0002 J9 RF JACK J10 J10 J10 J11 J11 J11 L1 L1 L1 L2 L2 L2 L3 L3 L3 L4 L4 L4 L5 L5 L5 L6 L6 L6 L7 L7 L7 L8 L8 L8 L9 L9 L9 L10 L10 L10 L11 L11 L11 1LCND001 L12 T116

25、7 1LLSA825 L13 8.2uH 1LLSA105 L14 1uH 1LLSA105 L15 1uH 1LLSA105 L16 1uH 1LCND001 L17 T1167 1LLSA825 L18 8.2uH 1LLSA105 L19 1uH 1LLSA105 L20 1uH PART LIST PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value 1LLSA225 L21 2.2uH 1LLSA105 L22 1uH 1L

26、CSL684 L23 6.8mH 1LLNA567 L24 560uH 1DLSG210 LED1 LED(G) 1DLSG210 LED2 LED(G) 1DLSR210 LED3 LED(R) 1DLSG210 LED4 LED(G) 1DLSG210 LED5 LED(G) 1DLSG210 LED6 LED(G) 1DLSG210 LED7 LED(G) 1DLSG210 LED8 LED(G) 1DLSG210 LED9 LED(G) 1DLSG210 LED10 LED(G) 1DLSG210 LED11 LED(G) 1DLSR210 LED12 LED(R) 1SFHB02A

27、P1 2 PIN 1SFHB02A P2 2 PIN 1SFHB02A P3 2 PIN 1SFHB02A P4 2 PIN P5 P5 P5 1SFHB02B P6 2 PIN P7 P7 P7 1SFHB02B P8 2 PIN 1TS00195 Q1 1TS00195 1TS00195 Q2 1TS00195 1TS04098 Q3 1TS04098 1TS03082 Q4 1TS03082 1TS00195 Q5 1TS00195 1TS00195 Q6 1TS00195 1TS04098 Q7 1TS04098 1TS00508 Q8 1TS00508 PART LIST PART

28、LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value 1TS04097 Q9 1TS04097 1TS04097 Q10 1TS04097 1TS04097 Q11 1TS04097 1TS04097 Q12 1TS04097 1TS04097 Q13 1TS04097 1TS01577 Q14 1TS01577 1TS04097 Q15 1TS04097 1TS01577 Q16 1TS01577 1RS6A203 R1 20K 1RS6A2

29、73 R2 27K 1RS6A123 R3 12K 1RS6A223 R4 22K 1RS6A101 R5 100 1RS6A101 R6 100 1RS6A203 R7 20K 1RS6A333 R8 33K 1RS6A222 R9 2.2K 1RS6A222 R10 2.2K 1RS6A101 R11 100 1RS6A101 R12 100 1RS6A332 R13 3.3K 1RS6A821 R14 820 1RS6A047 R15 47 1RS6A471 R16 470 1RS6A022 R17 22 1RS6A221 R18 220 1RS6A331 R19 330 1RS6A47

30、3 R20 47K 1RS6A223 R21 22K 1RS6A331 R22 330 1RS6A222 R23 2.2K 1RS6A022 R24 22 PART LIST PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value 1RS6A473 R25 47K 1RS6A010 R26 10 1RS6A682 R27 6.8K 1RS6A153 R28 15K 1RS6A153 R29 15K 1RS6A047 R30 47 1RS

31、6A104 R31 100K 1RS6A473 R32 47K 1RS6A124 R33 120K 1RS6A223 R34 22K 1RS6A222 R35 2.2K 1RS6A102 R36 1K 1RS6A103 R37 10K 1RS6A103 R38 10K 1RS6A203 R39 20K 1RS6A273 R40 27K 1RS6A123 R41 12K 1RS6A223 R42 22K 1RS6A101 R43 100 1RS6A101 R44 100 1RS6A203 R45 20K 1RS6A333 R46 33K 1RS6A222 R47 2.2K 1RS6A222 R4

32、8 2.2K 1RS6A101 R49 100 1RS6A101 R50 100 1RS6A332 R51 3.3K 1RS6A821 R52 820 1RS6A047 R53 47 1RS6A471 R54 470 1RS6A022 R55 22 1RS6A221 R56 220 PART LIST PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value 1RS6A331 R57 330 1RS6A473 R58 47K 1RS6A2

33、23 R59 22K 1RS6A331 R60 330 1RS6A222 R61 2.2K 1RS6A022 R62 22 1RS6A473 R63 47K 1RS6A010 R64 10 1RS6A682 R65 6.8K 1RS6A153 R66 15K 1RS6A153 R67 15K 1RS6A047 R68 47 1RS6A104 R69 100K 1RS6A473 R70 47K 1RS6A124 R71 120K 1RS6A222 R72 2.2K 1RS6A223 R73 22K 1RS6A102 R74 1K 1RS6A103 R75 10K 1RS6A103 R76 10K

34、 1RS6A152 R77 1.5K 1RS6A392 R78 3.9K 1RS6A010 R79 10 1RS6A472 R80 4.7K 1RS6A681 R81 680 1RS6A047 R82 47 1RS6A010 R83 10 1RS6A010 R84 10 1RS6A224 R85 220K 1RS6A224 R86 220K 1RS6A047 R87 47 1RS6A047 R88 47 PART LIST PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Compute

35、r No. Reference Value 1RS6A047 R89 47 1RS6A047 R90 47 1RS6A010 R91 10 1RS6A224 R92 220K 1RS6A224 R93 220K 1RS6A047 R94 47 1RS6A102 R95 1K 1RS6A102 R96 1K 1RS6A824 R97 820K 1RS6A473 R98 47K 1RS6A473 R99 47K 1RS6A473 R100 47K 1RS6A473 R101 47K 1RS6A473 R102 47K 1RS6A473 R103 47K 1RS6A562 R104 5.6K 1RS

36、6A225 R105 2.2M 1RS6A474 R106 470K 1RS6A153 R107 15K 1RS6A153 R108 15K 1RS6A473 R109 47K 1RS6A104 R110 100K 1RS6A104 R111 100K 1RS6A104 R112 100K 1RS6A104 R113 100K 1RS6A103 R114 10K 1RS6A103 R115 10K 1RS6A473 R116 47K 1RS6A103 R117 10K 1RS6A101 R118 100 1RS6A331 R119 330 1RS6A102 R120 1K PART LIST

37、PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value 1RS6A333 R121 33K R122 R122 R122 1RS6A223 R123 22K R124 R124 R124 1RS8D887 R125 8.87K(0805) R126 R126 R126 1RS6A047 R127 47 R128 R128 R128 1RS6A105 R129 1M 1RS6A563 R130 56K 1RS6A224 R131 220K

38、 R132 R132 R132 1RS6A103 R133 10K 1RS6A103 R134 10K 1RS6A102 R135 1K 1RS6A332 R136 3.3K 1RS6A047 R137 47 1RS6A104 R138 100K 1RS6A332 R139 3.3K 1RS6A124 R140 120K 1RS6A682 R141 6.8K 1RS6A223 R142 22K 1RS6A103 R143 10K 1RS6A103 R144 10K 1RS6A103 R145 10K 1RS6A103 R146 10K 1RS6A224 R147 220K 1RS6A103 R

39、148 10K 1RS6A392 R149 3.9K 1RS6A103 R150 10K 1RS6A102 R151 1K 1RS6A102 R152 1K PART LIST PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value 1RS6A102 R153 1K 1RS6A102 R154 1K 1RS6A102 R155 1K 1RS6A153 R156 15K 1RS6A124 R157 120K 1RS6A104 R158 1

40、00K 1RS6A153 R159 15K 1RS6A047 R160 47 1RS6A106 R161 10M 1RS6A123 R162 12K 1RS6A562 R163 5.6K 1RS6A562 R164 5.6K 1RS6A152 R165 1.5K 1RS6M273 R166 27K(M) 1RS6A102 R167 1K 1RS6A047 R168 47 1RS6M473 R169 47K(M) 1RS6A332 R170 3.3K 1RS6A047 R171 47 1RS6A332 R172 3.3K 1RS6A563 R173 56K 1RS6A473 R174 47K 1

41、RS6A332 R175 3.3K 1RS6A102 R176 1K 1RS6A332 R177 3.3K 1RS6A271 R178 270 1RS6A271 R179 270 1RS6A027 R180 100 1RS6A027 R181 100 1RS6A152 R182 1.5K 1RS6A152 R183 1.5K 1RS6A152 R184 1.5K PART LIST PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value

42、 1RS6A152 R185 1.5K 1RS6A152 R186 1.5K 1RS6A471 R187 470 1RS6A222 R188 2.2K 1RS6A222 R189 2.2K 1RS6A222 R190 2.2K 1RS6A473 R191 47K 1RS6A102 R192 1K 1RS6A333 R193 33K 1RS6A152 R194 1.5K 1RS6A561 R195 560 1RS6A047 R196 47 1RS6A101 R197 100 1RS6A105 R198 1M 1RS6A047 R199 47 R200 R200 R200 1RS6A333 R20

43、1 33K 1RS6A105 R202 1M 1RS6A822 R203 8.2K 1RS6A822 R204 8.2K 1RS6A563 R205 56K 1RS6A103 R206 10K 1RS6A010 R207 10 1RS6A047 R208 47 1RS6A822 R209 8.2K 1RS6A010 R210 10 1RS6A103 R211 10K 1RS6A822 R212 8.2K 1RS6A822 R213 8.2K 1RS6A563 R214 56K 1RS6A105 R215 1M 1RS6A154 R216 150K PART LIST PART LIST DAT

44、E：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value 1RS6A153 R217 15K 1RS6A102 R218 1K 1RS6A473 R219 47K 1RS6A104 R220 100K 1RS6A123 R221 12K R222 R222 R222 R223 R223 R223 R224 R224 R224 1RS6A010 R225 10 1RS6A010 R226 10 1RS6A101 R227 100 1RS6A103 R228 10K

45、1RS6A056 R229 56 1RS6A221 R230 220 1RS6A221 R231 220 1SWN0008 SW1 MAKE S.W. 1SWN0002 SW2 POWER S.W. 1IS01145 U1 1IS01145 1IS01145 U2 1IS01145 1IS02068 U3 1IS02068 1IS02068 U4 1IS02068 1IS02903 U5 1IS02903 1IS02903 U6 1IS02903 1IS04066 U7 1IS04066 1IS04073 U8 1IS04073 1IS04001 U9 1IS04001 1IS00572 U1

46、0 1IS00572 1IS02068 U11 1IS02068 1IS02068 U12 1IS02068 1IS02068 U13 1IS02068 1IS01604 U14 1IS01604 U15 U15 U15 PART LIST PART LIST DATE：May.20 2002 NO: R518P01B MODEL：NE100S CIRCUIT：1CR020AA (R020A9) Computer No. Reference Value 1IS06124 U16 1IS06124 1IS02903 U17 1IS02903 1IN07808 U18 1IN07808 1IS02068 U19 1IS02068 1IS02903 U20 1IS02903 1IS02903 U21 1IS02903 1IS02903 U22 1IS02903 1RNVA502 VR1 VR5K 1RNVA502 VR2 VR5K 1RNVA503 VR3 VR50K 1RNVA503 VR4 VR50K 1RNVA503 VR5 VR50K VR6 VR6