G08 lost top half vertical deflection

gwarble

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So i'm getting ready to pull the deflection board and reflow the connectors and paddle boards (after swapping the VR connectors and getting the same vertical collapse on the top half, i've concluded the 4 VRs are probably ok)

besides solder joints, any other common failures i should test/swap while i have it pulled that result in half vertical deflection missing?

thanks
gwarble

ps: its a sega space fury
 
unfortunately no, but its been intermittent
last time i pulled the chassis out i found one of the y-axis paddle board extra wires (one of the two wires soldered directly from the board to a resistor leg in the 600 section) came loose in man handling it... i figured it was barely hanging on and i finally found the intermittent problem, but alas resoldering it back on did not fix the problem...

i have yet to re-flow all the connector pins, but that and maybe changing out one of the transistors with the sheet metal heatsink in the 600 section will be my next step... the intermittent-ness has become a persistent problem unfortunately, but i do plan to look at it again soon (how many times i've told myself that aside, i really do need to fix this thing for good)

anyway, a good first step if you only lost one axis deflection would be to switch the transistors (on the big heatsink) connectors between the two paddle boards, as supposedly they are prone to failure... when i did this the y-axis remained the problem, so i'm pretty sure they are not my problem... due to wire length issues i had to un-mount the heatsink assembly to do this

and hopefully you've found this G08 faq:
http://www.arcade-museum.com/manuals-monitors/FAQ Electrohome G08 Version 0.8 dated 25 Feb 20.pdf

good luck, these monitors had a bad rep but its a necessary evil for some cool sega vectors, what do you have?

- joel
 
For me or madaracs?

If its for my problem, wouldn't switching the transistor-paddle board connection and the problem remaining in Y rule that out?

If its for madaracs, i read some of his other threads and while i don't know enough to really help, it sounds like it could be the transistors (or sockets) but it could go farther up the signal since its both top and bottom, all the way back to the input clamp board

Thanks
 
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