Arcade Collecting > Restorations & repair
Star Wars - fully working!
Level42:
--- Quote from: ChadTower on July 02, 2009, 05:26:35 pm ---
--- Quote from: Spyridon on July 01, 2009, 09:14:50 pm ---My DMM only has one setting for voltage regardless of AC or DC.
--- End quote ---
Ew! Replace that!
There are times you want to measure the AC on a DC circuit.
--- End quote ---
+100
Level42:
Spyri, I will have a look at your measurements and the schematic tomorrow and let you know. The voltages should be AC on the signal pins and DC on some supply pins....
Level42:
OK the number 8 and 4 pins are "supply" voltages fixed to +15V and -15V as shown on the schematics. So these values are ok.
Apart from not being able to selecet between DC and AC, does the meter have auto-ranging or can you select voltage ranges ?
It's really pretty hard to judge based on the values you give. What was the PCB trying to display when you measured, attract screen ? Or did you put up a test screen ?
If it's attract, I'd expect a number of the other values to vary in time.
To be honest, it looks like all measurements were done in DC, because the values where I'd expect to see a bit of signal in AC show values very close to zero. Are you sure your meter can't be switched between AC and DC, this is _SO_ rare, maybe you simply missed how to do it ? :D
Pins 6 of 8B/C and 9B/C is where things to start being different between the x and y-axis outputs. However, this could simply mean that the Xcenter pot is way different set compared to the Ycenter pot. Put both of these pots in the exact middle position and measure these pins again and let's know the results.
If the differences keep being so big, I'd say 9B/C is shot. It _looks_ like pin 7 is fixed in DC to the +supply so that amp is probably defective.
But again, not being able to switch between AC and DC is simply unacceptable. For not much money you can buy a DVM that can switch, worth the money IMHO.
(Do you have a pic of your DVM ?)
If I may advise you, I'd invest in something like this:
Fluke
Doesn't really need to be a Fluke, but the select-by-dial is still the best and easiest way to work with a multimeter.
By the way, that's extremely cheap for a real Fluke and it includes free shipping from Hong Kong worldwide......I smell something fishy....wait a minute, just checked Fluke's website there is no model 15B.......but man you gotta give it to those Chinese, they do some nice copying. However, inside there's a meter you can probably buy for 15 bucks.....
Level42:
Without trying to de-rail the thread, some more info on the Fluke I linked to:
It seems to be a real Fluke ! But the model is only sold in China (15B and 17B).
I asked the seller if this was a real Fluke as I didn't find it on www.fluke.com and almost instantly got a reply (on sunday!):
Hello, this is a absolutely real FLUKE meter. Both the 15B and 17B version are only sell in China market. In there China FLUKE website, you will find the info. about them. Please also refer to other buyer's feedback about the meter. Highly recommend it to all Engineers. IF there is other question, please write to us again. Thank you.
So I thought, yeah right, but after some googling I actually believe he's telling the truth:
http://assets.fluke.com.cn/evtmanuals/15b17b__cmeng0000.pdf
(Look at the URL, .cn =china !)
and:
http://www.flukecommunity.com/forums/showthread.php?t=3096
So, now there are two options:
1) Fluke produces a "less quality" model for the Chinese market and sells it and an affordable (yet still expensive for that market) price....
2) Fluke sells the same quality meter but simply names it differently and puts it in slightly different housing and sells it to the Chinese market at for them affordable price and we in the Western world get greatly SCREWED by the high prices we (or should I say, the _BUSINESS_ market who usually buy Fluke products) have to pay and get ripped off by Fluke.....
My guess ? Option 2 !
So, I actually think this is a serious deal to get a real Fluke !
However, the 110 series doesn't seem to be the highest priced range of meters by Fluke:
http://cgi.ebay.com/FLUKE-TRUE-MULTIMETER-110-SERIES-NEW-IN-ORIGINAL-BOX_W0QQitemZ330342391810QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item4ce9f0e002&_trksid=p3286.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1205%7C293%3A1%7C294%3A50
Compare the pictures, Chinese:
Fluke 110:
I'd like to see an inside picture though....
Spyridon:
--- Quote from: Level42 on July 05, 2009, 03:54:56 am ---(Do you have a pic of your DVM ?)
--- End quote ---
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version