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Author Topic: Hantarex Monitor Adjustment - How to?  (Read 3815 times)

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metahugh

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Hantarex Monitor Adjustment - How to?
« on: June 28, 2004, 08:52:16 am »
I believe I have a Hantarex monitor. The image on the tube is not positioned properly and needs to be moved vertically down. My cabinet doesn't have an opening at the rear so I have to take my monitor out to do the adjusting. I want to make sure that I am safe and don't get myself electrocuted.

Here is a picture of how my monitor is mounted in the cabinet:



My local arcade shop tells me that I have nothing to worry about as long as I don

MonitorGuru

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Re:Hantarex Monitor Adjustment - How to?
« Reply #1 on: June 28, 2004, 09:57:49 am »
First of all BOTH voltage and amperage can kill you, but yes, with the same voltage at different amperages, the higher amp will kill you faster/be more painful.

That said I'll start with my usual discussion:

In general, unless you are working on the chassis (e.g. soldering) or swapping a tube and are not doing stuff with the monitor on, you DO NOT NEED TO REMOVE THE ANODE WIRE OR WORRY ABOUT THE 30,000 volts that stored in the tube.  In these cases doing any of this is not necessary.

What you DO need to worry about is the risk that you can implode the tube by improper handling when attempting to remove the monitor from the cabinet.  a 19" monitor will weigh 50 # or so, and has a center of gravity very very close to the front (like a couple inches in) due to the very thick front glass on the tube.   When removing you need to make sure it doesn't tip down or tip up or swing it from side to side as you pull it out. Doing so would probably send the neckboard or neck itself crashing into the side of the cabinet and then breaking the tube, hopefully only destroying the vacuum in it, or worst case, imploding the tube causing a shattering of glass up to 20 feet away (and directly into the chest/face of the person removing it.)


Okay, that said, remove hte wing nuts while having someone hold the entire frame of the monitor. You don't know if it will release and fall or if it will simply rest without the wing nuts in place.  Slide it off straight forward at the same angle to the floor it is at (e.g. slightly lifting it it looks like).

Be careful of attached wires to the board. There should be 3 wires:
Double AC wire, typically black, around 16 gauge
Ground wire, typically yellow or green, either 16 gauge or a flat metal ribbon covered in plastic
A bundle of up to 6 wires leading to plastic connectors on the board. These are the video signals.

Once out you will probably want to place it on a table as high as the control panel and see if you can leave it plugged in so you can work on it without adjusting, then remounting, then removing, re-adjusting,etc..

That looks to me like a Hantarex 9000 monitor.  It is SUPPOSED to have a remote PC board with about 10 wires leading out to it.  Have you checked inside the coin door, or under the control panel for any such board?  It should have about 7 or so mini potentiometers on it attached to a rainbow cable of wires twisted into a round bundle.    I would doubt they would have left the remote attached directly to the board (it can go either on board or on a cable extension on this model) if in fact the back door is not removable (which surprises me as well)


I have one of these monitors (if it is the 9000 which it looks like) at home and could take pictures of the controls and board and upload them this evening when I'm home.

No, the control for VPOS is NOT the blue thing.  And no, VPOS is not on the neck board. The only things ever on a neck board are gun/grid controls such as the brightness level of RGB (Drive), the cutoff of RGB, and sometimes screen and focus grid controls.

The vertical/horizontal controls will be on the main chassis where the circuits are to control the yoke are located.

MonitorGuru

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Re:Hantarex Monitor Adjustment - How to?
« Reply #2 on: June 28, 2004, 10:03:41 am »
Actually looking closer at your picture, you indeed DO have the remote control vertical/horizontal adjustment board installed.

Look at your middle picture.  See that blue control in the foreground?  Okay, immediately behind that there are 2 rows of connections, one Yellow+White and one Red+Green+Blue+Brown(black?).  Those are the video inputs.  Now immediately behind that, notice there is another connector... it has a large multi-color twisted cable attached to it.

FOLLOW that cable to see where it goes inside your cabinet.  At the other end of the cable, presumably under the control panel or beside the coin door attached to the inside wall, there will be the 7 or so dials to adjust all the screen geometry with.

You should NOT have to remove the monitor from the case to adjust these things.  There are a couple more dials on the monitor itself, but for basic geometry you do NOT need to remove this thing, and you can safely adjust it while it's on, provided you find the other end of this cable!

metahugh

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Re:Hantarex Monitor Adjustment - How to?
« Reply #3 on: June 28, 2004, 12:56:41 pm »
Awesome, thanks for the info!  There was originally a strider in the cabinet.  The game works great but I had some problems initially adjusting the vertical positioning of the picture. When I made it too big the image would seem to wrap on itself at the top.

I finally got the monitor adjusted to what seemed correct but changing the verital positioning and height.

Here is a picture of the image at the correct proportions:



The image is the correct size but from what I can tell it's still a bit too high, there is about 1-2 inches of black space on the bottom.  I cannot adjust the height anymore from the remote board.  I really noticed this problem when I bought a Side Arms PCB and stuck it in my cab.  The image wraps at the top of the screen.  I have a gallery located here:

http://www.metahugh.com/arcade

In the first Side Arms picture you can see the top of the image is wrapped, the point counter is stretched.  It's really pronounced on the second to last image.

If I mess with the vsync I can get the image at the right place; only problem is at the point where the image is in the right spot the monitor is just about to loose vsync and the image rolls.

I have been told that my monitor has additional controls on the chassis for positioning.  Is this true or are all of the available controls on the control board?

Could my control board be bad?  

Thanks very much!


MonitorGuru

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Re:Hantarex Monitor Adjustment - How to?
« Reply #4 on: June 28, 2004, 01:44:09 pm »
I've got a brand new one of these monitors sitting at home. I'll take some pics tonight with all the controls to let you know where they are and what they do.

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Re:Hantarex Monitor Adjustment - How to?
« Reply #5 on: June 28, 2004, 02:28:34 pm »
Just got a chance to look at your pics.

If you've reached the end of the control for the VPOS, and you're still seeing what's called vertical foldover (the graphics that would be normally printed above the top of the screen given the position of the rest of the picture actually fold down and over on top of the other graphics that are much lower on the actual display, but high on the tube). This is normally accompanied by a stretching of the scanlines as well in the foldover text. Notice how much blackspace there is in the middle of your score.  (BTW..horizontal foldover works similarily, but the foldover actually ends up being a mirror image, not positive like vertical)


Anyway, it looks like you probably need to do a cap kit on this. That likely could help things.  If the picture properly moves with the VPOS control then the control is fine, it's dried out capacitors that are probably limiting the range that the control will work in.

Until that time you can use the VSIZE control to adjust the screen to fit, but then of course you'll have a larger black area at the bottom and smaller picture.

A cap kit for this should be $5 + $6 shipping from Bob Roberts... throw in some other stuff you may need to make the order more worthwhile.

Finally the last possibility is that the yoke has tilted over time bending the image upward. However this is normally accompanied by other geometric problems like a keystone image or tilted or bad convergence around the edges, though in an old monitor anything is possible, but I'd blame the capacitors first.


Then, if you do need to do a cap kit, then of course now you need to remove the monitor from the case, then learn how to properly discharge the tube safely, remove the anode wire, and then remove the chassis from the frame and remember where all the attached wires go, then install the cap kit and put it back together.

Good luck!

metahugh

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Re:Hantarex Monitor Adjustment - How to?
« Reply #6 on: June 28, 2004, 11:41:02 pm »
Thanks for the help MonitorGuru!

I think the cap kit is a good way to go, but of course I am getting those "Newbie" jitters when it comes to discharging the monitor!  I just want to be as safe as possible.

I might keep this for a winter project.  I am planning on repainting the cabinet from it's current state to a solid black.  I already have the replacement Strider sideart and cpo overlay.  Then I could take the monitor out and do the cap kit.  

I hope that is all it is!

Were you able to take some pictures of your monitor chassis?

Thanks!
« Last Edit: June 29, 2004, 07:49:43 am by metahugh »

MonitorGuru

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Re:Hantarex Monitor Adjustment - How to?
« Reply #7 on: June 29, 2004, 10:29:43 am »
Dang... got busy last nite and no pics.  I'll do my best to get them done today for you.

metahugh

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Re:Hantarex Monitor Adjustment - How to?
« Reply #8 on: June 29, 2004, 11:26:13 am »
No rush man!  I appreciate the help!  Whenever you get the free time.