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[ Pobierz całość w formacie PDF ]//-->Testing method of RB Ethernet portsdamaged by over voltageOver voltage can be caused by following reasons: high voltage surge, lightning, electrostatics etc.Testing procedures for over voltage damage.You can check if routerboard was damaged by over voltage or not, by using following testingmethod.1.2.Check Schottky diode measuring with multimetr in diode mode;Check voltage drop between diode array pin#1 and Ground.You should measure in diode mode (hold “positive” wire on the Groundand “COM” wire to diode array pin#1).Diode array pin#1 is always marked by dot mark on the diode array case(see picture 1 in the appendix).Diode array reference number and voltage drop values could be found in the table 1;3. Check termination resistors resistance in RJ-45 connector. For this measurementyou should take patch cord and plug it into the routerboard (see picture 2 in the appendix),and after that measure resistance of termination resistors.Resistance value between Rx and Tx line must be 150 Ohm +/-2%.If resistance value is smaller or higher then Tx/Rx line was damaged by high voltage surge.Ethernet connector reference number of each routerboard you can find in the table 1.Table 1Ethernet connectorreference numberRouterboardtypeSchottky diodereference numberDiode arrayreference number(voltage drop value, V)D2-D4; D17-D19;D21-D23(0,25V-0,32V)192411, 411AH,411AR, 411U,411UR,411UAHR433, 433AH,433UAH450D6, D7J6-J8; J13-J18D601D801, D803(0,38V-0,49V)D801, D802D601, D602, D603(0,38V-0,48V)D801, D802D601-D605(0,32V-0,42V)J601-J605J601, J602, J603J601711-2Hn,711-5Hn, 711-5Hn-MMCXD4D603D400(0,32V-0,4V)D401(0,32V-0,4V)J400J4711A-5Hn-MMCX711UA-5HnDD401D601, D603(0,32V-0,4V)D2, D4D400J400(0,32V-0,4V)J4750751U-2HnD1000D2, D4D2, D4------------------D18-D25(0,34V-0,4V)J401 (check eachEthernet port)J401J6-J9Groove-5Hn,Groove-5HPn,Groove A-5HnSXT-5DD1702D1903---------D3(0,42V-0,5V)J1000J1000SXT-5HnDD1903----------J1000Additionally to this testing method on RB250G, RB435G, RB450G, RB493G, RB493GAH,RB600, RB711G-5HnD, RB711GA-5HnD, RB750G, RB750GL, RB751G-2HnD, RB800, RB1100,RB1100AH boards you should check diodes bridges and resistor resistance (see Table 2).Table 2Schottky DiodeDiode arrayEtherentRouterboard diodebridgeAdditionalreference numberconnectortypereference referencecomponents(voltage drop, V) reference numbernumber numberCheck voltage dropbetweentest points on theCheck resistorsresistors andR10-R13Ground (seeresistance.picture 3 in theIt should beappendix). This75 Ohm +/-1%voltage drop value (see picture 4 inshould be in thethe appendix)range from 0,21Vto 0,28VIf voltage dropbetween D507,D508 pin#1 lessthan 0,23V thenEthernetconnector J504was damaged byover voltage.250GSD3D7, D8-----------435GD109D107,D108D501-D504;D507, D508(0,23V-0,3V)J501, J502450G------D805,D806D501-D510(0,21V-0,3V)J501-J503;J505If voltage dropbetween D507,D508 pin#1 lessthan 0,21Vthen Ethernetconnector J504was damaged byover voltageCheck resistorsR669, R670,R672, R673resistance (seepicture 5 in theappendix).It should be75Ohm +/-1%493G,493GAHD1101D1102,D1105D601, D603,D605, D607,D609, D611,D614, D615,D618, D620,D801, D803,D805, D807,D809, D811,D815, D820(0,21V-0,3V)J601-J603; J605;J801-J803; J805If voltage dropbetween D507,D508 pin#1 lessthan 0,21Vthen Ethernetconnector J604 wasdamagedby over voltage.J401, J702;600-------D902,D905D401, D402,D701-DD704(0,32V-0,4V)If voltage dropbetween D701,D702 pin#1 lessthan 0,32V thenEthernet connectorJ701 was damagedby over voltage.Check voltage dropbetween test pointsand Ground (seepicture 7 in theappendix).This value shouldbe in the rangefrom 0,22Vto 0,28VCheck voltage dropbetweentransformerTRF100 pins andGround. (seepicture 9 in theappendix).Thisvalueshould be in therange from 0,32Vto 0,38VJ11, J13Check resistorsR703-R706resistance.It should be75Ohm +/-1%(see picture 6 inthe appendix).750GD802D805,D806-----------Check resistorsR563-R566resistance (seepicture 8 in theappendix). Itshould be75Ohm +/-1%750GLD2D4, D9-------------Check resistorsR104-R107resistance.It should be75Ohm +/-1%800D17, D21 D1, D3, D5, D8,D9, D11Check resistorsR152-R155(0,28V-0,38V)If voltage dropbetween D5, D8pin#1 and Groundless than 0,28Vthen Ethernetconnector J12was damagedby over voltage.resistance (seepicture 10 in theappendix).It should be75Ohm +/-1%.D501, D503,D601, D603,D605, D607(0,30V-0,35V)D701, D703,D705, D707,D709, D711,D713, D715,D717, D719,D901, D904,D905, D907,D909, D911,D913, D915,D917, D919(0,20V-0,28V)J901-J905;J701-J705If voltage dropbetween D501,D503, D601,D603, D605, D607pin#1 and Groundless than 0,30Vthen Ethernet PHYU501, U601, U602was damagedby over voltage.1100,1100AHD1101D1102,D1105APPENDIXPicture 1Picture 2 [ Pobierz całość w formacie PDF ]
