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NKF RF trouble shooting guide
March. 26th, 2015
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RF Clock Diagram
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RF SMT 測站 BLT2 WiFi AW-CH639 (test mode firmware) BLT3 GPS BCM4752IUB2G (normal mode firmware)
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GPS trouble GPS station Check Fixture and environment Solution C/N=0
check RF probe is Murata or Woken ,due to their pins are deferent length, need to adjust the location. Solution Check J4001,U4004,L4003,U4005,U4003,L4001 X-ray U4006,U4002 repair。
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GPS
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GPS location
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Wi-Fi trouble Wi-Fi station Check Fixture and environment Solution
TX Power > 18 dBm Tx EVM fail, Rx sensitivity fail (b,g,n per 100%) Tx no power Check Fixture and environment check RF probe is Murata or Woken ,due to their pins are deferent length, need to adjust the location. check R9411 is 1.8V , R9412 is 4.2V Solution Check J6201,C6203 X-ray U9033 repair。
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Wi-Fi – check RF
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Wi-Fi loction– check voltage
R9412 4.2V R9411 1.8V
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