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x68000:soft_power_switch_troubleshooting_and_repair

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x68000:soft_power_switch_troubleshooting_and_repair [2012/11/21 00:17] eidisx68000:soft_power_switch_troubleshooting_and_repair [2019/08/27 20:45] (current) – external edit 127.0.0.1
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 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 at the Buffered IO part in the schematics, 3 of these signals are connected to the MFP GPIP port. They can be queried via software and are connected like this :+If you look at the Buffered IO part in the schematics, 3 of these signals are connected to the MFP GPIP port. 
 + 
 +**They can be queried via software and are connected like this :**
  
 |/RTC_ALARM  |GPIP0  | |/RTC_ALARM  |GPIP0  |
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 **A program for testing these signals can be found here :** **A program for testing these signals can be found here :**
  
-[[http://nfggames.com/X68000/Misc/SoftPower%20Test%20Program/x68k_pwrtest.zip|X68k Power Test]]+[[http://nfggames.com/X68000/Misc/Diagnostics/SoftPower%20Test%20Program/x68k_pwrtest.zip|X68k Power Test]]
  
 **Execute it more than one time. You should get :** **Execute it more than one time. You should get :**
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   *Bad IC28 (74LS08) (stuck output).   *Bad IC28 (74LS08) (stuck output).
   *Bad Q9 transistor (shorted).   *Bad Q9 transistor (shorted).
-  *Bad C64 (generating noise).+  *Bad C64 capacitor (generating noise).
   *IC29 (74LS244) might have bad output on pin 5.   *IC29 (74LS244) might have bad output on pin 5.
   *The power signal from the main board, which I miss infos actually. A fix to this could be soldering a 10K ohm resistor between IC28 pin 10 and 14.   *The power signal from the main board, which I miss infos actually. A fix to this could be soldering a 10K ohm resistor between IC28 pin 10 and 14.
  
  
x68000/soft_power_switch_troubleshooting_and_repair.1353421040.txt.gz · Last modified: 2019/08/27 20:44 (external edit)