Read Sharp UP-X500 (serv.man17) Technical Bulletin online
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1
CORRECTIVE ACTION
AGAINST THE CPU FREEZE
PROBLEM
1. Model Name: UP-X500 (CR-A352)
2.General:
In the field, they have experienced some problems such as
freezing in BIOS booting, etc.
freezing in BIOS booting, etc.
Accordingly, the countermeasure is provided as follows.
3.Cause:
As the reserved pin of the CPU datasheet and recommended
circuit is internally a pin of JTAG function, the pin is not
connected via a terminal.
connected via a terminal.
For this reason, the malfunction has occurred due to the
noise factor.
4.Action:
A Jumper wire (1pc), which directly connects the AF25pin of
CPU (reset signal) to GND, is to be added.
CPU (reset signal) to GND, is to be added.
(For fields)
Take the above action on a problem-occurrence basis.
Take the above action on a problem-occurrence basis.
(For production)
This is to be implemented from April 2004 production.
From the midstream of May 2004 production, the pattern of the PWB is to be
changed and the jumper wire is to discontinue.
changed and the jumper wire is to discontinue.
5.Parts Action:
No change is to be made for parts.
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