Nokia RM-12 Troubleshooting Instructions page 89

RM-12
Camera baseband HW troubleshooting
Start
Start camera
application
Measure V25_CAM at
C4435. Should be 2.5V
nominal. Is it 2.4V to
2.6V?
Yes
Measure V15_CAM at
C4434. Nominal 1.5V.
Is it 1.4V to 1.6V?
Yes
Check Vctrl by
measuring voltage
from pin 4 of D4405. Is
it 2.4V to 2.6V?
Yes
Measure ExtClk waveform
at D4405 pin 6 against
ground. Is frequency
9.6MHz and amplitude 1.7V
to 2.6V?
Yes
Measure I2C waveform
at connector X4420 10
and 11. Both signals
operating and amplitude
1.8V nominal?
Yes
Measure CCP waveforms
over R4424 and R4431. Both
signals operating, amplitude
min
amplitude
±150mV, differential
min
amplitude 300mV, common
mode voltage 0.9V nominal.
(Use viewfinder mode and
oscilloscope. AC mode for
amplitude and DC mode for
common mode voltage)
Yes
Camera OK
Page 87
Measure Vbat at
No
C4223. Should be
3.7V. Is it 3.4V to 4.2V?
Measure Vbat at
No
C4221. Nominal 3.7. Is
it 3.4V to 4.2V?
Measure voltage from
No
pin 3 of D4405. Is it
2.7V to 2.9V?
Measure ExtClk
No
waveform at D4405 pin 1
against ground. Is
frequency 9.6MHz and
amplitude 2.7 to 2.9V?
Check I2C waveforms
No
and operation at R4800.
Both signals operating
and amplitude is 2.8V
nominal?
No
Check R4424 and
R4431. Are they
ok?
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Flash the phone. Is the
Yes
camera working now?
Flash the phone. Is the
Yes
camera working now?
Yes
Change
D4405
Yes
No
Change
R4800
Nokia Customer Care
No
Change
N4203
No
Change
N4204
Issue 1 11/2004