Nokia 9000i - Page 256

After Sales
Technical Documentation
RAE/RAK–1N
Faultfinding/Disassembly
Page 8 – 14
Original, 05/97
0.
Start
3.
1.
NO
Undervoltage lockout
YES
Input filter
NO
removed?
OK?
YES
5.
6.
NO
YES
Power Unit
OK!
2.
Input filter
fault
4.
UVLO
fault
Vsys
OK?
10.
Reset
12.
LCDVEE
YES
OK?
OK?
24.
LCDVCC
OK?
YES
26.
VCC5
OK?
YES
28.
VBACK
OK?
YES
YES
NO
NO
Check Vsys
regulator.
7.
Is N81 pin 7
toggling?
8.
Vsys controller
fault
9.
YES
Check V88,
L82, C84
11.
Replace
25.
Check
V80, V86
NO
NO27.
Check
N80, C80
NO
29.
Check
G87, V85
13.
Is LCDVEEON
enabled?
14.
Command
LCDVEE on.
NO
NO
15.
Is 0V applied to
N83 pin 4?
16.
Check N82,
R75, R76, R96
NO
YES
17.
Is N83 pin 1
toggling?
18.
NO
YES
LCDVEE
controller fault
19.
Is V89 anode
voltage toggling?
20.
NO
YES
Check L81, V81,
R77, R74, R85
23.
Check V87, V82
R95, R98, R94
22.
NO
YES
Check V89, C89
and feedback
21.
Is there valid bias
voltage at C89 plus
terminal?
resistors
YES
D80
PDA Power Unit Check