Huawei Ascend G510, Maintenance Manual

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G510 Maintenance Manual V1.0 INTERNAL
2013-01-28
Huawei Confidential Page 46 of 96
Troubleshooting
Fault symptom: The G510 fails to be powered on or frequently breaks down. Checks on the
32.768 kHz oscillator show that X301 and U3101 have no output or output unstable
frequencies.
Handling: Replace X301 or U3101. If the problem persists, replace the PM8029.
Circuit Symbols
Signal Symbol Description Reference Measurement or
Waveform
XTAL32K
_OUT Output end for the 32.768
kHz main clock signals
XTAL32K_IN Input end for the 32.768 kHz
main clock signals
VREG_TCXO 19.2 MHz oscillator power 2.85 V
TRK_LO_ADJ Control signal of the 19.2
MHz output frequency None
RTR6285_TCXO 19.2 MHz clock output
TCXO 19.2 MHz clock output
9.2.4 Flash Memory Circuit
Circuit Diagram
Figure 9-13 shows the circuit diagrams of the flash memory.