Clocks Troubleshooting - Nokia NHL-2NA Series Troubleshooting Instructions

NHL-2NA

Clocks troubleshooting

The main clock signal for the baseband is generated from the voltage and temperature
controlled crystal oscillator VCTCXO (G591). This 26 MHz triangle wave clock signal is
supplied to OSC_IN pin of HAGAR. Inside HAGAR the clock frequency is divided to 13
MHz and then fed to RFCLK pin of UPP_WD2 and Bluetooth.
In SLEEP mode the VCTCXO is off. UEM generates low frequency clock signal (32.768
kHz) that is fed to UPP_WD2, Bluetooth and AEM.
RF
13 MHz
VCXO
RF-ASIC
RFBusCl
(Hagar)
LPRF
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 RF clock measuring.
IMPORTANT: Clock signals have to be measured with 1M Ω (or greater) probes!
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UPP_WD2
RFClk
Flash
Clk
FLASHes CAMERA
¤Nokia Corporation
CCS Technical Documentation
UEM
SleepClk
CBusCl
DBusCl
SIMCl
SIM
AEM
SDRAM
Clk
SDRAM
Issue 1 07/02