MikroTik RB450G Troubleshooting Manual Download Page 9 | Manualshive

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RB450G Output Voltage picture

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Summary of Contents for RB450G

Page 1: ...T OK OK Check resistor R819 resistance It should be 10 Ohm Change faulty resistor NOT OK Change faulty components NOT OK Check PWM controller U803 Change faulty controller NOT OK These repair instructions are for NON WARRANTY repairs only Please make visual inspection for signs of corrosion or mechanical damages before starting Check PNP transistor Q802 and Zener diode D804 NOT OK Change faulty MO...

Page 2: ...own converter U805 OK NO 2 5V NOT OK Check ferrite beads FB802 FB803 resistance It should be less than 1 Ohm NO 1 2V Change faulty DC DC Step Down converter U806 OK Try to change RAM memory U201 U204 PoE does not work Change faulty diode bridges Check diode bridges D805 D806 OK NOT OK Change faulty connector Check connector J504 NOT OK The board is unrepairable Problem still appears Change faulty ...

Page 3: ...for example on C841 pins Change faulty ferrite beads NO 1 5V OK Check ferrite bead FB501 resistance It should be less than 1 Ohm Change faulty ferrite bead NOT OK OK Change faulty connector Check transformer TR501 NOT OK OK Check resistors R563 R566 resistance It should be 75 Ohm 1 OK Change faulty resistors NOT OK Check ferrite beads FB804 FB805 resistance It should be less than 1 Ohm NOT OK OK C...

Page 4: ...E Switch U501 NOT OK OK Check 1 5V output for example on C841 pins Change faulty ferrite beads NO 1 5V OK Check ferrite beads FB502 FB505 resistance It should be less than 1 Ohm Change faulty ferrite bead NOT OK OK Check termination resistance between Tx and Rx lines in the each Ethernet connector It should be 150 Ohm 2 NOT OK OK Check ferrite beads FB804 FB805 resistance It should be less than 1 ...

Page 5: ...RJ45 w LED w Shield TD TH w oEMI TinPlated Q801 AO4441 Alpha Omega Transistor MOSFET P Ch 60V 4A 100mOhm 3W SO 8 Q806 AP9960GM Advanced Power Electronics Corp Transistor MOSFET N Ch Dual 40V 7 8A 20mOhm SO 8 R563 R566 CRCW060375R0FKTAB C Vishay Intertechnology Inc Resistor 75R 1 0603 FB801 FB802 FB805 BLM18PG331SN1D Murata manufacturing Co Ferrite Bead 330Ohm 1 2A 0603 R819 CRCW040210R0FKTDB C Vis...

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