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Author Topic: Hantarex Monitor faulty chassis (Dead Flyback and Missing Voltage Regulator)  (Read 158 times)

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ReitouFox

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Hello ArcadeControls

Recently I bought an arcade cabinet which according to the seller failed recently, but was working perfectly before that. Initial inspections revealed signs of the flyback tranformer bursting (and scorching most of the board in the process), one of capacitors has clear bulging and considering the seller mentioned sending the PCB for testing not long before me purchasing it, I'm slightly concerned by the fact one part that I assume is a voltage regulator has been desoldered from the board recently.

As you've probably figured out, I haven't tested it personally, but I didn't see the point in it as it's obviously damaged.

So what I'm hoping to achieve is finding a replacement flyback transformer (at an affordable price), replacing the bad cap and figuring out whether that missing component is necessary.

Okay, I guess it's time for serial numbers:

Chassis:
  • HANTARE MTC 900
  • No 9019 (label cuts off past this point)
  • MZ 07 50144811

Neckboard:
  • ZG 06 50144841
  • HANTAREX

Flyback:
  • MHF023-21
  • M 7Z05
  • ITALIA ELDOR

Monitor:
  • N. 372649

That's all I could make out, if I missed something, please let me know, but just to make it easier, I've uploaded some photos to Imgur, here's the album: https://imgur.com/a/4b1MTnP


Okay I think that's it for now

Thank you so much in advance

Kind regards

D

princess prin prin

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MTC9000 not 900.

Solder side doesn't look in bad condition. Flyback pads are all there. There is just a lot of flux around them due to desoldering. You can clean it up with alcohol/solvents or some more specific flux remover.

Flyback may be bad but I don't see the bursting you talk about (maybe in the rear?). Replacement is HR7025.

The big cap isn't bulging, it just has a domed plastic insulator on top. Of course all the caps are quite old now and should be replaced anyway.

Missing transistor (TR19 BU801) is in the voltage regulator circuit and it needs to be there.

ReitouFox

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Thank you so much for your response Princess Prin Prin

Ah so the label must be mis-printed, it did look like it was missing a number or two.

That's reasuring, I always thought it looked a little burnt, honestly I didn't desolder the flyback either, I would have used a bit more flux, but I'll definitely clean the board up with isopropyl alcohol once I've finished soldering the replacement in.

Sorry about that, I was certain I had gotten the split in one of the photos, but just for future reference, here's what it looks like: https://i.imgur.com/upB2VZj.jpg

You'd have thought they would have just printed that on the flyback, all my searches for "MHF023-21" just came up with expired ebay listings, I'm so glad a company in Ireland sells them, I thought I was going to have to get one imported.

Alright, I haven't really encountered that style of electrolytic capacitor in the past, so I wasn't sure, but I'll take your advice and replace them all anyway (may as well considering Cap kits are pretty cheap).

Okay, I just assumed it was a voltage regulator because it had a heat-spreader marking on the silkscreen, I don't normally mess with transistors as they rarely fail.

I'll get everything together and test the monitor and post the results here.

Thank you so much again for all your help

Kind regards


princess prin prin

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You'd have thought they would have just printed that on the flyback, all my searches for "MHF023-21" just came up with expired ebay listings, I'm so glad a company in Ireland sells them, I thought I was going to have to get one imported.

The original flyback is made by Eldor (Italian) but the white part is made by Murata (Japanese) and that code is just for that part. The flyback # was on a sticker that fell off.

  
 

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