SY-41CL lock up current drain
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12-15-2016, 10:52 PM
Post: #2
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RE: SY-41CL lock up current drain
(12-15-2016 07:38 PM)JurgenRo Wrote: Inadvertently I've tried to plugging a non existent Rom Image. The machine locked and showed @s in the Display. I removed batteries and let the machine sit on my shelf without batteries for full 2 month in hope to drain the current from the board that way. Today I inserted the batteries again and ... the 41CL is still locked up, same behaviour as before. Several things to check: 1. Press SHIFT-4 (BEEP) to see if it's really locked up or just a display sync problem. If it beeps it's just a display sync problem. 2. With the batteries out, press and hold ON for a few seconds. This triggers the power supply to try to power-up the FPGA, which will drain any residual charge from the caps in the power supply. The discharged power supply will usually fix the issue eventually. I think that there is some state in the display drivers that _really_ needs the power to go away before it can exit it, but I'm not sure. Don't turn the machine on immediately after inserting the batteries. 3. I once had to wait several days to recover from what was effectively the same thing. (I erased the Flash page where the YFNX lives... forgetting that once it was gone there would be nothing to return to after the erase completed.) It might take several tries, but the ON with no battery always gets things going eventually. |
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