x68000:soft_power_switch_troubleshooting_and_repair
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x68000:soft_power_switch_troubleshooting_and_repair [2012/11/20 23:59] – eidis | x68000:soft_power_switch_troubleshooting_and_repair [2012/11/21 00:17] – eidis | ||
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===== Soft-power troubleshooting and repair ===== | ===== Soft-power troubleshooting and repair ===== | ||
- | The following information is kind contribution by our forum members **Lydux** and **Caius** and this fix was applied to X68000 | + | The following information is kind contribution by our forum members **Lydux** and **Caius** and this fix was applied to X68000 SUPER and Expert HD. |
- | The symptoms: X68000 powers on fine, but does not shut down when the soft-power button is pressed. The screen fades, Power LED does not change from Green to Red and the system | + | **The symptoms:** X68000 powers on fine, but does not shut down when the soft-power button is pressed. The screen fades, Power LED does not change from Green to Red and the PSU fan keeps spinning. The same happens with a regular ATX PSU. |
If this is your case then the problem is almost surely located on the IO board. | If this is your case then the problem is almost surely located on the IO board. | ||
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{{: | {{: | ||
- | A condition using 4 signals is used to get the X68K turn on/off correctly : | + | **A condition using 4 signals is used to get the X68K turn on/off correctly :** |
- | | + | |
*Via the RTC (Real Time Clock) alarm signal (/ | *Via the RTC (Real Time Clock) alarm signal (/ | ||
- | *From the expansion bus (signal | + | *From the expansion bus (/EXPWON) |
- | *A signal from the system controller | + | *Via the front power switch |
+ | *Via the soft-sequence signal | ||
- | In normal operation, all these 4 signals must go logic High (+5v) to get a system shutdown. | + | In normal operation, all these 4 signals must go to logic High (+5v) to get a system shutdown. |
The problem might be due to a signal that is always stuck Low. | The problem might be due to a signal that is always stuck Low. | ||
- | If you look to the buffered | + | If you look at the Buffered |
|/ | |/ | ||
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*PSON = 0 | *PSON = 0 | ||
- | **If RTC_ALARM always | + | **If RTC_ALARM always |
*Bad RTC chip (RP5C15) | *Bad RTC chip (RP5C15) | ||
x68000/soft_power_switch_troubleshooting_and_repair.txt · Last modified: 2019/08/27 20:45 by 127.0.0.1