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Author Topic: Wells Gardner D9200 - Horizontal Collapse?  (Read 2945 times)

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Rocketeer2001

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Re: Wells Gardner D9200 - Horizontal Collapse?
« Reply #40 on: February 22, 2024, 08:33:28 pm »
That's the impression I was getting looking at all the ones for sale. Thanks for clarifying!

The replacement transistor has arrived, and the MG Chemicals silicone compound has also arrived. Now I'm just waiting on the mica.

Rocketeer2001

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Re: Wells Gardner D9200 - Horizontal Collapse?
« Reply #41 on: March 23, 2024, 07:16:52 pm »
I'm back!

Got the replacement transistor for Q418, the MG silicone heat compound, and the mica sheets. I think the quality of mica sheets has severely declined since the early 2000's. I could only order them in a pack of 20, and out of all those only 1 looked somewhat better than what I already had.

Anyways, put all that stuff back on the board, put the board back in the cabinet, turned it on and....nothing. I get the *thump* sound when I flick on the power, and the neck tube is glowing, and I can hear a relay clicking 3 separate times, but the screen is black and it doesn't do that frightening electrostatic sizzle a tube typically makes when it energizes.

Seems like I have a power problem now. I don't think I hooked up any wires incorrectly, but I'll go double check. If not that, what else? The flyback? Q401, Q425, IC101, or IC403?

One step forward, two steps back... :banghead:

grantspain

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Re: Wells Gardner D9200 - Horizontal Collapse?
« Reply #42 on: March 24, 2024, 05:24:35 am »
does the sheet fully cover the transistor metal body?

Rocketeer2001

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Re: Wells Gardner D9200 - Horizontal Collapse?
« Reply #43 on: March 24, 2024, 11:22:36 am »
Yup! It's the same size as the old one.

lilshawn

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Re: Wells Gardner D9200 - Horizontal Collapse?
« Reply #44 on: March 24, 2024, 11:28:32 am »
upstream from the transistor is a fet that can sometime get plotzed when the main transistors go. it'd be Q413. double check that D417 diode pack too if you haven't already. it's hard to tell what the problem is with these monitors since every single system is separate in these chassis, since it sounds like no HV is being produced now... but not sure since you can't actually tell if having the Q418 in there now is working and you have deflection... but can't see it cause of no HV.

if no hv sounds (and not just a horizontal line) you may have to go upstream from both those systems and look at the "h-outctrl" signal coming from the main IC driver chip (IC301 pin 21). if effs off in a tee and one direction goes to the horizontal Yoke drive circuit and the other goes to the drive circuit for the flyback. i'm dealing with a similar issue with a D9200 with "the jitters" and have been pouring over this area for a while trying to find the issue... so i've been getting very familiar with it.

anyway, sounds like maybe that signal has now stopped since you have no HV and previously you did. there is a bit of shared circuitry so it's possible for a failure in one to effect the other. could be worth looking into Q423 Q424...  Q426 and Q427. they are pre-pre-drive transistors and pre-drive mosfets used to drive their respective transformers (T404 and T405) that fire off the h-deflection (2SC5144) and HOT transistors (2SC4770). this is the beginning of the "tee"

make sure you have a +32v power coming in to this part of the circuit at R470, this is the juice used to make the pulses in the transformers by grounding out the other transformers leg to ground through the pre-drive mosfets.

might be a problem with Q413 or D418, since the 170v drive that flows through the 2SC5144 flows through this fet and diode, and grounding that 170v out through an improperly attached 5144 can cause a huge amount of current to go through Q413 and D418. check and make sure you have 170v here as well. if not, you have an issue further up the chain in the power supply (possible blown out R854 or D814 or open L801).


Rocketeer2001

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Re: Wells Gardner D9200 - Horizontal Collapse?
« Reply #45 on: March 24, 2024, 06:47:39 pm »
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.
« Last Edit: March 24, 2024, 06:50:02 pm by Rocketeer2001 »

lilshawn

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Re: Wells Gardner D9200 - Horizontal Collapse?
« Reply #46 on: March 25, 2024, 07:38:04 pm »
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

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Re: Wells Gardner D9200 - Horizontal Collapse?
« Reply #47 on: March 25, 2024, 11:57:17 pm »
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!

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Re: Wells Gardner D9200 - Horizontal Collapse?
« Reply #48 on: March 26, 2024, 10:35:45 pm »
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

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Re: Wells Gardner D9200 - Horizontal Collapse?
« Reply #49 on: Yesterday at 02:41:10 pm »
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