Nokia 636, 638 Service Manual trouble
After Sales Technical Documentation
TROUBLESHOOTING
INSTRUCTIONS
FOR NHA–2 & NHA–4
Original, 43/96 NMP Part No. 0275035
Troubleshooting Instructions
AMENDMENT RECORD SHEET
After Sales
Technical Documentation
Amendment
Number
Date Inserted By Comments
Page 2
Original, 45/95
After Sales
Technical Documentation
TROUBLESHOOTING INSTRUCTIONS
Contents
Introduction Page 4
General Page 4
General Chart Page 5
Logic Fault Page 6
Receiver Fault 1 Page 7
Receiver Fault 2 Page 8
Transmitter Fault 1 Page 9
Transmitter Fault 2 Page 10
Earphone Level/Modulation Level Fault Page 11
Display or Keypad Fault Page 12
Call Set–up Fault Page 13
Troubleshooting Instructions
Original, 45/95
Page 3
Troubleshooting Instructions
Introduction
General
The purpose is to define fault block of the module and then find out the broken
component. The trouble shooting diagram has been planned so that the fault,
whatever it is, can be found by as simple measurements as possible.
The flow diagrams give you the overview of the blocks. The purpose is that you
proceed through the flow diagram so that, if your answer is YES for the asked
question, go straight to the next level, but if your answer is NO, you have to go
the subbranch.
Required servicing equipment:
– PC for PC locals
– Power supply (2.0 A)
– Digital multimeter
After Sales
Technical Documentation
– Oscilloscope
– RF cables
– Modular cable
– RS232/MBUS adapter
– CMT/Marconi
– RF measuring chassis
The Troubleshooting for NHA–2 consist of 8 consequent checks according to
the following flow diagram.
Page 4
Original, 45/95
After Sales
Technical Documentation
General Chart
Troubleshooting Instructions
START
Will turn into
local mode ?
Receiver OK ?
( SINAD OK )
Transmitter operating
( RF power OK ) ?
Earphone level /
modulation
Yes
Yes
Yes
No
No
No
No
Logic fault
Receiver fault
Transmitter fault
Earphone level or
modulation fault
Is display / keypad
working ?
Call set–up ?
END
Yes
Yes
Yes
No
No
Display or keypad fault
Call set–up fault
Original, 45/95
Page 5
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