Nokia RH-47 Series Description page 33

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Company Confidential

RH-47

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6 - Baseband Description and Troubleshooting

and then fed to RFBusClk.

In SLEEP mode the VCXO is off. UEM generates low frequency clock signal (32.768 kHz)

that is fed to UPP_WD2, Bluetooth and ZOCUS.

When the flashing of the device does not succeed, but powering is OK, follow these

instructions.

Note: The absence of clocks may indicate that the device (put phone to LOCAL mode

when the sleep is not allowed or press buttons so that phone is not in sleep mode) is in

sleep mode. Make sure that the device is not in sleep during clocks measuring.

IMPORTANT: Clock signals have to be measured with 1MΩ (or greater) probes!

Measure signal from J170. This should be 26Mhz clock signal. See Figure 2, "RFClk" on

the next page. For more information, see RF Troubleshooting.

Check that the crystal oscillator (B190) is oscillating at 32.768kHz frequency. If not,

change B190. If OK, measure sleepclk from PIN 26 BT module. Frequency should be the

same 32.678kHz (see Figure 6, "Sleep clock," on page 34 below.) If not, change UEM.

Issue 1 05/04

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Troubleshooting