TroubleShooting for RBGroove-5Hn and RBGroove A-5Hn These repair instructions are for NON WARRANTY repairs only! Please make visual inspection for signs of corrosion or mechanical damages before starting. No power, green LED LD1200 does not shine Check Ethernet connector J1000 for mechanical damages NOT Change faulty Ethernet connector Check Schottky diode D1702 NOT Change faulty Schottky diode Check ferrite bead FB1701 resistance. NOT Check Zener diodes D1701, D1703 NOT Change faulty diodes Check PNP transistor Q1701 NOT Change faulty transistor Check P-channel MOSFET Q1700 NOT Change faulty MOSFET Check ferrite bead FB1700 resistance. NOT Change faulty DC-DC Step-Down converter U3 NOT Change faulty converter
RB does not boot Check 2.6V output, for example on transistor Q801 collector pin NO 2.6V Check ferrite bead FB900 resistance. Change faulty DDR SDRAM U8 Check 1.28V CPU core output, for example on C1805 pin NO 1.28V Check ferrite bead FB1800 resistance. Change faulty PWM DC-DC Step-Down converter U19 NOT NOT Check 40MHz CPU clock on crystal oscillator X600 pin#3 NO 40MHz Change faulty crystal oscillator Ethernet port does not work, drop ping packets Check Ethernet transformer TRF1000 NOT Change faulty transformer Check 1.8V output, for example on C836 pins NO 1.8V Check PNP transistor Q800 Check ferrite bead FB1000 resistance. NOT NOT Try to change PHY chip U1 Change faulty transistor
Network WLAN chip AR9280 does not show in the interface menu Check 1.20V output, for example on C405 pins NO 1.20V Check ferrite bead FB400 resistance. Change faulty PWM DC-DC Step-Down converter U18 NOT Check 40MHz on Crystal Oscillator X600 pin#3 NO 40MHz Change faulty crystal oscillator RADIO PART Receive does not work Check antenna connector J200 for mechanical damages NOT Change faulty antenna connector Check SPDT Switch S300 NOT Change faulty SPDT switch Check Bipolar transistor Q300 NOT Change faulty transistor Try to change WLAN chip U2
Transmit does not work Make visual inspection antenna connector J200 for mechanical damages NOT Change faulty antenna connector Check 5.0V output, for example on C1903 pins NO 5.0V Check ferrite bead FB1900 resistance. Change faulty DC-DC Step-Down converter U4 NOT Check SPDT Switch S300 NOT Change faulty switch Check power amplifier U11 NOT Change faulty power amplifier Try to change WLAN chip U2
Temperature monitor Check SPDT Switch S1500 NOT Change faulty switch Check Dual amplifier U10 NOT Change faulty dual amplifier Check thermistor RT1500 NOT Change faulty thermistor Voltage monitor Check SPDT Switch S1500 NOT Change faulty switch Check Dual amplifier U10 NOT Change faulty dual amplifier Check TRENCH MOSFET Q1500 NOT Change faulty MOSFET
Reference number Part Number Manufacturer Description D1701 D1702 BZX84C10-T1-LF SR210-T3-LF Won-Top Electronics Co., Ltd. Won-Top Electronics Co., Ltd. D1703 BZX84-B30,215 NXP Semiconductors FB400, FB900, FB1700, FB1800, FB1900 FB1000 PBY160808T-331Y-N BLM15AG121SN1D Yageo Corporation Murata manufacturing Co. Diode Zener BZX84C 10V 5% 225mW SOT23 Diode Schottky 100V 2A SMA Diode Zener BZX84B 30V 2% 250mW SOT23 Ferrite Chip Bead, 0603, 330 Ohm, 2A, SMD Ferr Chip Beads 120 Om 500mA, 0402, FB120 FB1701 PBY321611T-800Y-N Yageo Corporation FERRITE 3A 80 OHM 1206 SMD J200 Q300 N-JYHD-R4 BFR740L3RHE6327 ChuangLian Electronic Component (Group) Co. J1000 3004CM5601 KINSUN INDUSTRIES INC Infineon Technologies Taiwan Co Ltd Q800 KTA1663-Y-RTF/P KEC Corporation, LTD PCB-N-Male connector RJ45 with TabDown, w/oleds, w/ omagnetics, wshield, Right angle, SMD (5mm) SiGe Heterostructure Bipolar Transistor, DC-6GHz PNP transistor Ic= -1.5A, Vce= -30V, SOT-89 Q1500 2N7002,215 NXP Semiconductors TRENCH MOSFET, SOT23 Q1700 AO4441 Alpha & Omega P-Ch MOSFET -60V -4A 100mOhm SO-8 Q1701 BC856B,215 NXP Semiconductors Small Sign PNP 250mW SOT-23 RT1500 ERT-J1VT152J Panasonic CVCA NTC Thermistor 1.5K, 0603, 5% S300 UPG2163T5N-E2-A NEC Electronics S1500 TRF1000 SN74LVC1G3157DCK R H1632CG Texas Instruments Mentech Electronics Co.,Ltd. U1 AR7241-AH1A Atheros Technology Ltd. U2 AR9280-AL1A Atheros Technology Ltd. U3, U4 LSP5502SAC U8 NT5DS16M16CS-5T Lite-On Semiconductor corporation NANYA TECHNOLOGY CORPORATION GaAs MMIC SPDT Switch, 2.4GHz&6GHz, 2.5-5.3V IC SWITCH SPDT SC70-6 10/100 Ethernet transformer with 4 line filters, SMD, RoHS Network processor 400MHz, DDR1/2, USB2.0, PCI-E, 5x 10/100 PHY LQFP128-EP 802.11n 2.4/5GHz 2x2 MIMO MAC,BB,Radio WLAN IC, PCIe DC-DC Step-down converter 4.5-30V input 2A output, SO8, RoHS DDR SDRAM 256Mbit DDR400 16Mx16bit TSOP-66 0+70C RoHS When you order components for repairing boards from our sales, please, write components reference number not a part number
Reference number Part Number Manufacturer Description U8 (for RBGroove A) NT5DS32M16BS-5T NANYA TECHNOLOGY CORPORATION DDR SDRAM 512Mbit DDR400 32Mx16bit TSOP-66 U10 LM258DR Texas Instruments IC DUAL OP AMP 8-SOIC U11 LX5530LQ-TR Microsemi Corporate U18 U19 X600 RT8025GJ5 RT8025GJ5 FD4000130 Richtek Technology Corporation Richtek Technology Corporation SaRonix-eCERA Corporation InGaP HBT 4.5-6.0 GHz Power Amplifier, RoHS 1.25MHz, 400mA (works with 600mA load). PWM Step-Down DC/DC converter TSOT-23-5, Halogen free 1.25MHz, 400mA (works with 600mA load). PWM Step-Down DC/DC converter TSOT-23-5, Halogen free Crystal Oscillator 40MHz 10ppm 1.8V 15pF -20+75 5x3.2 When you order components for repairing boards from our sales, please, write components reference number not a part number
RBGroove-5Hn Reference picture
RBGroove-5Hn Reference picture