x68000:soft_power_switch_troubleshooting_and_repair
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| Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
| x68000:soft_power_switch_troubleshooting_and_repair [2012/11/21 00:15] – eidis | x68000:soft_power_switch_troubleshooting_and_repair [2012/11/21 00:18] – eidis | ||
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| Line 35: | Line 35: | ||
| *PSON = 0 | *PSON = 0 | ||
| - | **If RTC_ALARM always | + | **If RTC_ALARM always |
| *Bad RTC chip (RP5C15) | *Bad RTC chip (RP5C15) | ||
| Line 49: | Line 49: | ||
| *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 |
| *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.txt · Last modified: 2019/08/27 20:45 by 127.0.0.1