Nokia 9000i - PDA Faultfinding; Block Diagram; Introduction; Required Servicing Equipment

After Sales
Technical Documentation
RAE/RAK–1N
Faultfinding/Disassembly
Page 8 – 8
Original, 05/97
PDA Faultfinding
Introduction
The purpose of this document is to provide methods to find the component that
is malfunctioning in the PDA module of the Communicator. Due to the large
integration scale used in the Communicator, it is always not possible to point the
faulty component for sure. However the flow diagram introduced here is made to
fulfill the aim as well as it is possible.
Required Servicing Equipment:
– PC for the PCLocals
– power supply
– RS cable
– digital multimeter
– oscilloscope
– frequency counter (optional)
Block Diagram
The block diagram of the Communicator PDA is described in the picture below:
CMT module
PDA module UI module
io D 15:0 MA9:0
reset Cntrl
A21:1
CPU
Intel 80386BX
sio 1 LCD
sio 0
io PLL D9:0, S7:0
PDA
power
unit
RS232
Buffer
IR
tranceiver
Buzzer
QWERTY
–keypad
1Mx16
DRAM
00000h
–
1FFFFFh
28F016SV
FLASH
CS1
3A00000h
–
3BFFFFFh
28F016SV
FLASH
CS0
3C00000h
–
3DFFFFFh
28F016SV
FLASH
UCS
3E00000h
–
3FFFFFFh
PDA LCD
module
Softkeys
PLL circuit
Clock
generation