PCEngineFans.com - The PC Engine and TurboGrafx-16 Community Forum
NEC TG-16/TE/TurboDuo => TG/PCE Repair/Mod Discussion => Topic started by: JohnnyPhantom on April 03, 2013, 02:41:45 AM
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Hey everyone, It's been a while,
It's great to be back ^-^, was wicked busy with other problems/projects these last few months. BUT!! Free time now, so I dusted off the non working Duo and replaced all the caps! Wooo!!
I also replaced the laser when I last touched it.
Now its like 99% almost working. Here's the scoop. I adjusted the pots according to this guide, http://www.pcenginefx.com/forums/index.php?topic=8926.0 , measuring resistance with a multimeter
Using this chart...
(http://img543.imageshack.us/img543/3622/readingscopy.html)
Now, all my pots are lined up pretty close to those numbers. EXCEPT!!! 105.
on my 105 pot, AC is correct, BUT!!! not AB. AB shows ABSOLUTELY NO RESISTANCE at all. a big ol' 0 shows up on the multimeter, and when I do a connection test, the multimeter makes the "beep" noise to indicate those two points are connected. I looked around the entire board and I don't detect/see any solder bridges or anything. I can't see whats causing the connection. When I power the unit on, and load a game, as far as I can tell, the machine runs perfectly! Games load, HU card sounds, CD sounds, and redbook audio sounds perfect, no clicks or pops or anything.
Could it be a bad pot? are they replaceable? what should I do?
I'd like to make sure the system is 100% repaired, but this pot having no resistance makes me a lil.. iffy.
Should I just ignore it?
thanks for the help everyone!
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Oh wait, I may have jumped the gun, The VERY NEXT POST after the chart post by DUO_R says "Update: ok did another read on VR105:
VR105:
AB: 0
AC: .300
BC: .300
I am going to blame it on the cheepie ohmeter, looks like it wasn't displaying the decimal there. Not sure about the AB measurement but this is what I am getting now. Ok going to throw away the cheepie ohmeter now. lol"
sooo... AB at 0 is normal?