Trouble Shooting - Fujitsu MB91360 User Manual

7.9 Trouble Shooting

Problem
Evaluationboard does not
initialize after power-on.
LED D10 (Power indicator) does
not light up and the LC-display
remains empty.
Evaluationboard stays in reset.
LED D11 (Reset indicator) ligths
up permanently.
After power-on, the initial
monitor-message is not shown
on the LCD.
The communication from
Softune Workbench to the
© Fujitsu Microelectronics Europe GmbH
STARTERKIT MB91360
Chapter 7 Appendix
Solution
Check voltage supply and jumpers :
The voltage on DC-Power plug
should be in the range of 9-12V. The
plug should have + on shield and – on
the center. LED D10 should light up
after switching on the board. Use a
multimeter to see whether 5V are
present on the Vcc/Gnd terminals (TP2
and TP3).
Check jumper positions according to
table 1 (Esp. : JP1 – JP7) !
Remove all user extensions on the
board to avoid shorts !
LED D11 (Reset) should flash. If D11
lights up permantantly, the voltage is too
low (below 4.25V) - Increase the voltage
to solve the problem.
JP33 (DTR reset) should be left
open. This option allows to reset the
board from a connected PC using the
DTR line (not used by Softune WB).
Remove all user extensions on the
board to avoid shorts or leakage
currents !
Check JP34 (default-mode) : This
jumper should be in the lower position
(Monitor mode). In the upper position,
the board will call the user program in
Flash-ROM directly and will not show
the message.
Maybe the monitor-kernel has been
destroyed. Try to re-program the kernel
as desribed in the „flash programming"-
section.
Check all jumper positions (table 1).
Adjust the LCD contrast using
potentiometer RV1.
Make sure your COM-port number
and the baudrate settings are correct
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