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RM-12
APE Clocking
APE clocks
trouble
shooting
Clk32k (J4815):
Voh ~ 2.8V &
f ~ 32.768kHz ?
(Figure 1)
Yes
12Mhz clock
(C4800, OSC1_IN):
Vpp ~ 1.7V &
f ~ 12.0MHz ?
(Figure 3)
Yes
Check completed
Issue 1 11/2004
SleepClk ( J2802):
Voh ~ 1.8V &
No
f ~ 32.768kHz ?
(Figure 2)
No
Check that
(C4800, OSC1_IN)
DC-offset ~ 720mV
No
(C4802, OSC1_OUT)
DC-offset ~760mV
(Figures 3&4)
Yes
Solder joints of
C4800, C4801,
C4802 and B4800
OK ?
Yes
Measure
resistance over
No
C4801.
R >>1M ?
Yes
Change B4800. If
this doesn't help,
change C4800,
C4801 and C4802.
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
Reflash the phone
first and check that
Clk32k is not shorted
Yes
to GND or some
power line. If Clk32k
still doesn't w ork,
change UEM
Go to CMT clocks
troubleshooting
Solder joints of
No
OMAP1510
damaged
No
Fix solder joints
Check solder joints
of V6031 and
replace the
component, if
necessary.
Nokia Customer Care
51
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Troubleshooting
