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RM-305; RM-306
RF troubleshooting
Crystal troubleshooting
Introduction
26 MHz Reference Oscillator (VCXO)
The 26 MHz oscillator is located near the UPPCosto IC (D7402). The coarse frequency for this oscillator is set
by an external crystal (B7402).
The 26 MHz signal from the crystal can be measured by probing C7436. The level at this point is approx.
276mVpp. Example Signal Measured at VCXO output (C7436).
FM radio troubleshooting
FM radio troubleshooting
Steps
1. Connect the phone to a PC with the module repair jig.
Phoenix and establish a connection to the phone with the data cable e.g. FBUS.
2. Start
Issue 2
Figure 77 Crystal output signal waveform
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