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Wells Gardner D9200 - Horizontal Collapse?
Rocketeer2001:
Hey Shawn, thanks for the excellent suggestions!
I found 2 faulty parts:
Q413 is completely shorted; all it's legs have continuity to one another and the mounting tab.
Q414 is reading as two resistors instead of a mosfet, so I'm going to assume that one is bad.
Just to be sure, I also checked these parts and they are all still good:
D417
Q423
Q424
Q426
Q427
Q412
Q415
Q428
Q430
I didn't check the IC301 or any transformers or if I had +32v at R470. The two faulty parts you've helped locate are likely the only problem (fingers crossed), unless you think there's anything else I should be check knowing that Q413 and Q414 failed.
lilshawn:
i would check R854, its a resistor that knocks down the 170 as it comes out of the SMPS. if the 170 line has been overloaded, it's possible the resistor has gone out of spec, causing the voltage to be off.
since both q414 and q413 where both bad, i'd double check everything in that section upstream and down....
R460
c470
D424
c448
C436
D405
C457
R461
R462
D418
D417
basically check the capacitors and the diodes for shorts and the resistors to be within tolerance... having shorted components is a real stressor. hopefully nothing else is wrong, but it can't hurt to check.
Rocketeer2001:
An excellent suggested list of things to check! I see where you're going with this.
I got started on it tonight but didn't get too far. R854 is fine, but R462 is shot. Has no resistance, so I'll need one of those. I was getting unreliable readings from the capacitors on the board, so I'll have to remove them to test them properly.
To be continued!
Rocketeer2001:
I proceeded this evening to remove all these components and test them:
R854
R460
R461
R468
D424
D405
D417
D418
D429
C470
C448
C436
C457
C442
C443
C419
Out of all those parts, none of them were bad. They are all fine. The only new failed part I found is the same as yesterday, the R462. I'll put in an order tonight and hopefully have those before the weekend.
Shawn, I hope you're getting somewhere with your D9200 as well.
lilshawn:
thanks, hopefully that you get back up and running again. (or at least closer to running so we can see what else is going on)
my projects get back burnered all the time. I have stuff at work that comes up that needs my priority, so it can take quite a while to get back around to things. i like "explaining" out my repair attempts in my posts, so when inevitably i forget where i was at in my repair... i can swing back and read through my post to jar my memory. :cheers:
getting old sucks :lol