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Nokia 6020b Service Manual

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Issue 1 03/2005
COMPANY CONFIDENTIAL
25
Copyright © 2005 Nokia. All Rights Reserved.
RM-31
6(a) - Baseband Troubleshooting Instructions
Nokia Customer Care
■ 
Keypad faults 2
Display 
faults
Measure
SLEEPX signal
from J2801 when key is 
pressed.
Is it 1.8V?
When 
keypad is pressed,
 the LEDs are turned 
on?
No
No
Yes
No
Yes
Check lines.  If still 
failing change UPP.
Check lines. If still 
failing change UPP.
Are keys working?
Keypad
faults
2
Retest
END
Yes