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How to adjust horizontal position past trimpot area on arcade monitor?
Zebidee:
Challenge accepted, I've read through the MS8/Jomac thread 3-4 times now. :notworthy:
Couldn't find his rag on XP (maybe it is in another thread?). Anyway, not important. Two key messages from Joey:
"I have measure on a CRO [cathode ray oscilloscope] watching all sorts of Mame setups that are supposed to be blocking everything outside of 15K but at startup before there is even anything displayed I have seen anywhere from 13K to 17K before they settle to somewhere in the 15K range."
"the only way you can safely use an MS8 Nanao is to delay powering the monitor until the MAME has fully loaded , it's all the odd frequency changes that happen during bootup that damages these chassis"
So wow yeah, I'd interpret Joey's comments to include JPAC and ATOM setups, don't assume your MS8 is safe with these. There is a handy power switch on the back of the Astro cabs you often see the monitors in (sixth from left in my signature pic below).
Jomac:
--- Quote from: Zebidee on May 27, 2020, 11:13:09 pm ---Challenge accepted, I've read through the MS8/Jomac thread 3-4 times now. :notworthy:
Couldn't find his rag on XP (maybe it is in another thread?). Anyway, not important. Two key messages from Joey:
"I have measure on a CRO [cathode ray oscilloscope] watching all sorts of Mame setups that are supposed to be blocking everything outside of 15K but at startup before there is even anything displayed I have seen anywhere from 13K to 17K before they settle to somewhere in the 15K range."
"the only way you can safely use an MS8 Nanao is to delay powering the monitor until the MAME has fully loaded , it's all the odd frequency changes that happen during bootup that damages these chassis"
So wow yeah, I'd interpret Joey's comments to include JPAC and ATOM setups, don't assume your MS8 is safe with these. There is a handy power switch on the back of the Astro cabs you often see the monitors in (sixth from left in my signature pic below).
--- End quote ---
Just an add in guys, @Zebidee , this advice is the most important, something I did miss mentioning is that I have never come across a case where Vert Freq alone has caused the module to fail, I have tested between 55 & 65hz without an issue while the H-Freq is operating within the safe range.
What I have found is the more the V-Freq is outside 60hz the less tolerant the range is for the H-Freq before the module fails.
So it's safe and recommended to lock the V-Freq at 60hz as long as you can keep the H-Freq within the mentioned range ( 15.450khz and Max of 16.050Khz , optimal is 15.750Khz ) , in some cases this can only be achieved by delaying power to the monitor.
Keep in mind while it's pretty inconvenient when the module blows and needs to be repaired it's not a huge job, it only really becomes an issue when people start messing with the H-Hold trying to get the chassis to sync when it can't anymore this usually blows the HOT and power supply section.
It's never going to be the end of your chassis just a short downtime so don't let the fear of this happening stop you enjoying one of the best monitors ever made.
buttersoft:
Thanks, Joey! I'll admit I had the impression you couldn't repair the MS8 once the sync blew, so that's good to know. IT's also the case that monitor techs are getting hard to find, of course :)
Zebidee:
--- Quote from: Jomac on June 03, 2020, 02:10:31 pm ---So it's safe and recommended to lock the V-Freq at 60hz as long as you can keep the H-Freq within the mentioned range ( 15.450khz and Max of 16.050Khz , optimal is 15.750Khz ) , in some cases this can only be achieved by delaying power to the monitor.
--- End quote ---
Thanks Joey! That quote above can be directly translated to a monitor preset (crt_range for CRT-emudriver/VMM) too. :cheers: