Calendar freeze: Difference between revisions
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(Created page with "thumb|Typical freeze screen ([[system ROM|SP-S2) on startup.]] ==Cause== A freeze at startup on the shown screen (with no click of death|cycli...") |
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* Check {{Chipname|uPD4990}} traces, especially power and pin 11 ({{Sig|TP|TP}}) | * Check {{Chipname|uPD4990}} traces, especially power and pin 11 ({{Sig|TP|TP}}) | ||
* Check {{Chipname|NEO-F0}} interface pins | * Check {{Chipname|NEO-F0}} interface pins | ||
* Check {{Chipname|74HC32}} and traces to {{Chipname|uPD4990}} | |||
* Try to reset Backup RAM content: | |||
** Either remove battery | |||
** Or flip all dip switches to on and then power on the board. Then turn off the board and return all dips to normal settings | |||
* You can use unibios to skip this error | |||
[[Category:Repairs]] | [[Category:Repairs]] | ||
Latest revision as of 12:29, 29 April 2018
Cause
A freeze at startup on the shown screen (with no cyclic reset) is caused by the RTC not outputing a time pulse at all.
The system ROM doesn't give a CALENDAR ERROR in this particular case because of a programming oversight.
Suggestions
- Check battery voltage
- Check 32768Hz crystal
- Check uPD4990 traces, especially power and pin 11 (TP)
- Check NEO-F0 interface pins
- Check 74HC32 and traces to uPD4990
- Try to reset Backup RAM content:
- Either remove battery
- Or flip all dip switches to on and then power on the board. Then turn off the board and return all dips to normal settings
- You can use unibios to skip this error