The dimensions of 106.1mm x 57.1mm meant it would fit comfortably The chosen unit came from AliExpress, a +12V 8A switch mode PSU with an 85V-260V AC input range.
#Safe sharp x68000 emulator Pc#
This would leave the machine externally no different to original but have the addedĪdvantage that it could be powered not only from the original 100V AC but all other common mains supplies.Īs multi-rail PSU's matching the X68000 requirements (Stand by 5V, 5V, +12V, -12V with soft power on) were not common for the given dimension restraints - PC ATX power supplies were technically suitable apart from the inverted soft power onĮnable signal, they were too large in dimensions - I opted for a high current, 8A +12V switch mode PSU with a good reputation and a pico-atx converter which converted +12V to all required PC voltages of which the X68000 shared in common.
#Safe sharp x68000 emulator full#
To replace the power supply, how it was achieved depended on the owners expertise.Īfter studying requirements and alternatives I decided to go with a full internal replacement of the original PSU mainboard. Also noting on a lot of sites those people who managed to repair the PSU often ended up with it later failing. IC's rather than discrete transistors) there is no comparison. Switch mode PSU's coming out of China (not sure if these are Japanese, European, American designs or Chinese but they are much better, fewer more standard components and dedicated control This is my experience and I must go on what I know and have experienced.
![safe sharp x68000 emulator safe sharp x68000 emulator](http://uploads.tapatalk-cdn.com/20160713/cc1856dcf2feb7a0a6425cb080dcde3e.jpg)
Switch mode PSU's after previous bad experience, it is a black art! Most of the semiconductors are no longer manufactured or obtainable and if you manage to find a data sheet and look upĪn alternative, chances are you will have problems as slight differences can be catastrophic. I must be candid and say I dont like early Having determined, on all 3 X68000 machines I bought, the power supply was faulty I researched up the design and obtained the circuit diagrams. The original batteries, the orange coated CR2450’s belong to the X68000, the brown NiCd belongs to an MZ-2500 which suffers similar fates when they leak. I/O board after capacitor and NiCd battery replacement. I replaced the CR2450 battery with the same model. Was lucky to be using a more 'safe' battery and no damage had occurred. Some batteries coming to end of life will leak and this acid seeps along the PCB disolving and corroding lands, pads and components. With modern electrolytics which will hopefully prolong the life of these great machines.Īnother area of concern and one which has seen many machines end up on the scrap heap is the NiCd battery. I decided based on what I had read that the best course would be to replace all capacitors Tantalum experience, or engineers repairing sensitive equipment such as oscilloscopes, they fail quite often and the school of thought is to replace them with electrolytics. If you read up on any of the radio/tv engineers Work for many more years but should one fail with close proximity to memory and custom IC's then the instanteous short circuit of a tantalum failing prior to the PSU shutting down may be enough to damage the IC's. Sharp no doubt have done a good job and the school of thought is to leave them, to replace them with modern equivalent or replace them with modern electrolytics. Polarity and often have to be overrated for the expected voltages.
![safe sharp x68000 emulator safe sharp x68000 emulator](https://forums.retrox.tv/download/file.php?avatar=446_1496997281.jpg)
![safe sharp x68000 emulator safe sharp x68000 emulator](https://www.retrostic.com/img/emulators/retroarch-small.jpg)
The capacitors of real concern though are the tantalum bead capacitors, when they fail they go short circuit and cannot tolerate any reverse Is any slight leak in the casing then they will dry out and lose performance (some go open circuit) much more quickly. All are full of capacitors and the electrolytics have done well considering the MTBF for some are advertised as 2000 hours at 60-80'c and if there There are 3 main boards to consider for renovation, the motherboard, I/O board and the video output board.
![safe sharp x68000 emulator safe sharp x68000 emulator](https://i.ytimg.com/vi/T0fdELfdI2Q/maxresdefault.jpg)
It is important to re-grease any moving part which previously used grease (often white powdery deposit) after cleaning. If I seeĪny IC's with oxidization I apply contact cleaner, doing this for all connectors as well, both socket and plug, all variable resistors etc. Washing the circuit boards in clean Isopropyl alcohol there is a considerable deposit of dirt and carbon removed as is evident in the wash. The plastics were soaked in warm soap suds as the usual black oily film was present, a gift from the passage of time (and pollution)!.Ĭarbon and rust are real enemies of electronics yet people allow them to build up, probably unaware. Smells a bit but ensures the longevity of the machine. In order to preserve the machine, all metalwork was soaked in Isopropyl alcohol to remove 'gunge' and then coated with a fine rust oil.