WG 6100 - F600 and F700 Fuses blown

cjoli

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I've had a pretty good run with my Tempest, It's been running without issues for few years now but today the monitor went out and when I opened it up to take a look, I notice fuse F700 and F600 were blown, which I assume means the transistors are bad attached to those. So, before I just test and likely replace the transistors on the frame, any suggestions what could have caused both fuses to go that and should look into anything first.

Also, I will mention that the other day I did notice some of the vectors jumping around a bit for the first time but then it seemed to go away and I played a few games last night and everything was fine, I can still here the game playing blind also I did caps and a rebuild on the monitor when I got it a few years ago.
 
you have to do further testing. if the diodes inline with the pre-drive transistors are shorted, the pre-drives are junk. if you don't replace these bad parts you'll inevitably blow the frame transistors again. I'm sure that's all documented thoroughly in andrewb's guide. you also bring the monitor back up in steps, not plug everything back in and hope it works. I know that's in the andrewb guide. :ROFLMAO:

also don't use 5886/5884 transistors, stick with 3716/3792 and make sure you buy them from APAR. the U07/57 pre-drive transistors, also APAR. the Dx02 diodes I use 1N4007s for replacements. you also need to hunt for any blown resistors in the area, your failure sounds like a pretty catastrophic one. if you need to replace resistors make sure you use the same wattage rating they call for because if you go up in wattage rating you can get bigger fireworks later. think of them as being kind of like fuses, but putting like a 20A instead of a 2.0A LOL

the F600/700 fuses are 3A fast, the power fuses are 5A slow. absolutely don't overfuse these.

there are also 2N3904/3906 transistors, electronics scholars will tell you the PNPs fail more, and from my own experiences, I agree.

if you're still using clear mica insulators for the frame transistors I strongly encourage dumping those and getting the silicone TO-3 insulators and you can clean up all the old thermal paste with paper towel and rubbing alcohol. the silicone insulators don't need paste, so it makes everything way cleaner and easier to manage.

B&W vector FAQ (I know it's for B&W and not color 6100 but the information still applies): https://arcarc.xmission.com/PDF_Monitors/FAQ Black and White XY Version 1.1 dated 7 Feb 02.pdf

how to bring up a 6100: https://arcarc.xmission.com/PDF_Monitors/How to Bring Up a 6100 Monitor - v20170517.pdf

I'm not @andrewb but I have a fair amount of vector games to maintain at work, I've learned a few things from him over time ;)
 
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