Hantarex MTC 9110 - width problems

M

mawrick

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I'v just replaced flyback transformer and a recap, fired it up successfully (I guess cabinet/monitor haven't been working for 15-20 years) so never seen it running myself.

The 130V seem to be ok (The monitor is powered via a step down transformer so 110V (where it should be 128V), but afaik this should be ok (seen other running with this voltage), but can't seem to get the width to fully expand.

I did adjust the coil on the picture as I thought it was the coil for adjusting width, but it's the coil for horizontal linearity. Later found out it might be related to what hantarex names a "bridge coil", but trying to adjust this one it seem stuck, and it started to crumble when trying to move it, so just gave up on that.

Is there any known replacements for those bridge coils that is available today, or maybe other chasis that have these exact coils ?.

If anyone have any available it might be of interest, also if there is any other tips on how to sort this issue it woulf be appreciated.

The game used for testing is a vertical shooter so orientation is wrong on the game on the pics :)


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M

mawrick

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gunblade said:
do you have a cap meter, if so check all the poly cap values near the flyback
does you pincushion correct the curve?
Click to expand...

Don't have a esr meter, if you think about the "curvy" picture it does seem to adjust that part ok I guess.
video from adjusting rv04 (pincushon board)


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M

mawrick

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Back at looking for errors on the hantarex 9110, and while taking some pictures to look a little better, seem to be the Diode D18 has damages, it will roughly measure 490 and 570 ohm the other way (in circuit) - anyone know if this at all can affect this width problem ?

Only diodes I had on hand is the ones pictured, but unsure if I can at all use these here (for testing) , so any tips appreciated :)

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M

M K L

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1,052CR
D18 is the rectifier of the 26V that supplies the vertical deflection as well as the east-west correction so you wouldn't have H size and pincushion corrections without that voltage but you wouldn't have vertical deflection either so that can't be the cause of your issue but if you want you can check for 26V at R6 near the EW module. And diodes are checked with meter in diode test and one side lifted from the board. In other words you're barking at the wrong tree.
 
M

mawrick

Newbie
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16CR
M K L said:
D18 is the rectifier of the 26V that supplies the vertical deflection as well as the east-west correction so you wouldn't have H size and pincushion corrections without that voltage but you wouldn't have vertical deflection either so that can't be the cause of your issue but if you want you can check for 26V at R6 near the EW module. And diodes are checked with meter in diode test and one side lifted from the board. In other words you're barking at the wrong tree.
Click to expand...

Alright, thnx for clearification - btw, would it be ok to have it hooked up without actually having the flyback hooked up to the tube (for easier acces to do chekcs on the different TP's) ?.

If not hooking up the flyback would I still need to discharge the "cap" (shorting flyback cap) after applying power to the chasis ?

I think I read somewhere the cap isn't fully charged if everything isn't hooked up ?
 
M

M K L

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1,052CR
To test the secondary voltages of the flyback, the chassis must be fully connected to the tube, anode cap and yoke (without yoke the flyback wouldn't work anyway).
 
M

mawrick

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Any idea if powering it by 110v ac (on the 128v input) could cause an issue like this?,
From what I understand there is people powering it by a 110v step down.

I have the original us250 psu, putting out about 140v dc (on the 135v output), have been a bit vary of using it due to adjusting 5v also adjust the 135v, but though of maybe hooking it up only supplying the monitor now adjusted all low to 140v, if this at all might be an issue.
 
M

M K L

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1,052CR
When you increase the width to the maximum (with H AMP pot), the voltage at the cathode of D13 should go down to 0 volt. If your meter has croc clips, attach it to the cathode of D13 (or the anode of D12) and see what the voltage is at maximum width.
 
M

M K L

Active member
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1,052CR
If you can measure capacitance, check C37. There should be another cap in parallel with it soldered on the bottom. You don't need to desolder them as one end goes to the yoke header so it's as if it were lifted (esp. if you unplug the connector).
 
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