Recent content by chessiv

  1. Looking for someone who repairs hantarex mtc-900e chassis

    Please pm me

  2. SOLD - GAME Blue Shark by Midway! Southeastern MI 48085 $1000

    I was hoping it would be -200 by now… ;-)

  3. Robotron 1-3-1 (I know..)

    Replacing those chips fixed it. Thanks to everyone who helped.

  4. Robotron 1-3-1 (I know..)

    Two bad chips on the ROM board - 7411 and 7425. After testing in circuit I pulled them and both failed on the tester. I don't have either so I'm ordering a few. Update when they're in.

  5. Robotron 1-3-1 (I know..)

    They all read out correctly. I'll try pulling them all but E7

  6. Robotron 1-3-1 (I know..)

    Thanks for the offer BR. Luckily I have a working sinistar to swap boards with. Braedel I installed the sinistar rom board in robotron with the robotron CPU board. So I eliminated power, and the robotron CPU board. I'm working on the robotron ROM board. I verified the 6821 is good as is the...

  7. Robotron 1-3-1 (I know..)

    Thanks Brad. I'll run those tests tomorrow. Thinking it might be a decoder, I grabbed them from my working sinistar and same issue. Then I grabbed the CPU board from the sinistar and tried it. Same-ish bank 3 ram issues. I'm thinking I need to go through the rom board next.

  8. Robotron 1-3-1 (I know..)

    checked power at both boards. Checked those first it changes but it's generally not moving. Looks more like garbage on the screen

  9. Robotron 1-3-1 (I know..)

    Sorry, yeah that all checks out

  10. Robotron 1-3-1 (I know..)

    I've pulled every ram chip and tested them on a tester. The game originally came up with a 1-3-8 which was actually bad and after I replaced it then got the 1-3-1. I tested all of the following 74153's 7474's and the logic chips 7486,7408,7410,7404 I didn't test the shift registers yet. I...

  11. K7500 Shutdown - I want to send out for repair

    Also, I did send it to Behrmr. I've been screwing with it too long and I'm not a fan of working on monitors anyway.

  12. K7500 Shutdown - I want to send out for repair

    I did adjust the shutdown voltage to .1. Before I replaced the pot the shutdown voltage would fluxuate. Afterwards it was pretty solid right around .1 That was this first thing I did. Like I said before, I did read all the tips and suggestions and tried most of them.

  13. K7500 Shutdown - I want to send out for repair

    I've got a K7500 that works 98% of the time and randomly goes into shutdown. When it does I power cycle it and it comes right back on. I've read all the posts I can find. Replaced the shutdown adjustment pot. Replaced the zener in the shutdown circuit. Tested components. I've had enough and I...

  14. Area 51/Maximum Force schematic needed. Trigger always high on left gun interface

    Thanks all. I ordered a few from digikey. I have a hot air station so should be an easy fix.

  15. Area 51/Maximum Force schematic needed. Trigger always high on left gun interface

    Looking closer at the board seems likely it’s the ls14 inverter
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