Nokia Alfaskop TT/386 User Manual page 78

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Power-On Test Errors
The above description applies if no errors were found during the
power-on test, which will normally normaly be the case. On the
other hand, if an error should be found, this will be indicated in
either of two ways:
• a sequence of four or eight beeps is heard immediately after
you have turned the system unit on.
• two long beeps are heard and an error message is displayed
when the monitor has warmed up.
The remainder of this section explains the steps you have to take if
either of these two error situations occurs.
A Sequence of Four o r Eight Beeps Is Heard
If a sequence of four or eight beeps is heard immediately after you
have turned the system unit on, you should proceed as follows.
1.
Turn the system unit off.
2.
Wait a few seconds, and then turn it on again.
3.
If the sequence of beeps is heard again, this indicates a
hardware malfunction in most cases. Call your Nokia Data
service representative and report the signal pattern.
Below follows a list of error codes where a short beep is a binary
zero and a long beep is a binary one, for example, - . . - . - . -
(long short short long, short long short long) means 9,5.
• • • — (1)
There is no refresh of system DRAM
memory.
(2)
The system timer is not working
properly or the CPU oscillator is to
slow/fast.
. . —
(3)
There is a memory address problem
in the first 64 kBytes of memory on
the system board.
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