Power Key Troubleshooting; Clocks Troubleshooting - Nokia RH-47 Series Description

RH-47
7 - Baseband Description & Troubleshooting

Power key troubleshooting

Clocks troubleshooting

Clocks include the following:
• RF-clock
• DBUS, CBUS clocks
• Flash and SDRAM clocks
• Sleep clock
• Bluetooth clock
• SIM clock
• MMC clock
The main clock signal for the baseband is generated from the voltage controlled by crys-
tal oscillator VCXO. This 26 MHz triangle wave clock signal is supplied to OSC_IN pin of
Mjoelner and out to UPPWD2. Inside UPPWD2 the clock frequency is divided into 13 MHz
Page 32
Company Confidential
Phone cannot
be powered by
pressing pwr
key
Connect
charger, phone No
is powered
up?
Yes
Change power key
and retest
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Company Confidential
Nokia Customer Care
See dead device
troubleshooting
Issue 1 05/04