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  1. TCW

    Rowe AMI R-82 Memory Unit

    Still waiting on those transistors to arrive. And to think I made certain to buy from a US seller but there from Oregon with Free & Fast shipping but no tracking. Anyway, in the meanwhile I took the Credit Computer unit out. It has a pair of twin Sprague 35uf 50vdc electrolytic caps and both had...
  2. TCW

    Rowe AMI R-82 Memory Unit

    I re-soldered the headers all though that was done in the resent past. I am not seen where to find the Service Bulletins for this era. The early AMI and anything from R-84 and on are readily available. I did order 10 pairs of MPSA06 + MPSA56 as a refresh measure for this Memory Unit...
  3. TCW

    Rowe AMI R-82 Memory Unit

    This is the Memory Unit you can't play a record with out it. Its located under the Encoder. The Encoder is just below the turn table.
  4. TCW

    Rowe AMI R-82 Memory Unit

    I picked up non-working R-82. This is my latest observation. These selections were made in secession one after the other after each record had been returned and magazine returned to home position. It seems to show a warmup of weak circuitry. Any information regarding component level repairs on...
  5. TCW

    AMI G80 Mechanism Short!

    Oh ya, anything carriage related. - Tom
  6. TCW

    Rowe Ami memory unit 301-07855 schematics needed.

    @omegaman, I hope you're still checking in from time to time. I picked up non-working R-82. This is my latest observation. These selections were made in secession one after the other after each record had been returned and magazine returned to home position. It seems to show a warmup of...
  7. TCW

    AMi F Returns Record

    I am trying to help a buddy out who's F puts the record on the platter, sets the needle down and immediately picks back up and then returns the record. Is the cutoff contact messed up somehow or can this also be caused by one of camshaft contacts?
  8. TCW

    Ron Rich and jukeboxaddicts forum

    I assumed there was a plan to keep it going afterword's. I assumed jukenorman would take over or something/ someone like that. I'm feeling very disconnected with out Ron. God bless him.
  9. TCW

    Original Space Invaders RAM

    The sounds are fully working now after changing out the 4006 chip. Adjusting Vert Linearity 1 & 2. These adjustments seemed to effect the overall screen more so than just the edge of the screen which is what I was really looking for. Part of my image is cut off and not being displayed on the...
  10. TCW

    Original Space Invaders RAM

    While preparing to adjust R257, R253 I thought about cleaning all the pots so I pulled the chassis and removed the circuit board from it. After that I was looking at that old crusty 2 watt Resistor and decided to check on it. Sure enough it was out of tolerance. From there I went ahead and...
  11. TCW

    Original Space Invaders RAM

    Understood. I got a bit more exaggerated in my adjusting and that seemed to help my situation. These rings where way out of adjustment and I didn't see any factory ring marks present. Its improved as far as centering is concerned. I still have a little bow towards the right though. My biggest...
  12. TCW

    Original Space Invaders RAM

    I remember reading the +73 V when I recapped it, adjusting it with R212, but I am going to recheck it now that you mentioned it. I seem to recall a test point for that was #2 maybe. I will put a meter on now and see what it is. Its at +75.1 DC, is this acceptable? When either of the two...
  13. TCW

    Original Space Invaders RAM

    So... I read through the 19V1001-19" CRT Service Manual & Parts Catalog and its clearly written for those familiar with CRT circuits but I was able to make several adjustments. I did adjust the vertical size for instance. But I still do not see how to move the vertical projection for centering...
  14. TCW

    Original Space Invaders RAM

    So here is what I did, I wanted to check for voltages at the test ROM because it was acting as if there was nothing in position "H". I tried reseating it and there was no change. I went back and put in the game ROM's and figured if nothing changed I would test the data and address pins at that...
  15. TCW

    Original Space Invaders RAM

    Here is my rig, I picked it up a year ago and I have been looking for a descent "how to" as far as applying it to trouble shooting. I get taking voltages with it and seeing + or - voltages graphically but how to interpret frequencies or timing I'm not there yet...
  16. TCW

    Original Space Invaders RAM

    I know there is a specific section of the board for that so I will have to investigate what's involved in that circuit. Got it now. Looks like its safe to say its either the 4006 or the 4030. I'll check the value of the resistors and caps though. I have bigger fish to fry right now though. I...
  17. TCW

    Original Space Invaders RAM

    So I installed the LM556CN and *INV-1, *INV-2, *INV-3 & *INV-4 now work (See video), but LAU-H does not sound correct. Is thus due to a bad cap somewhere (I pulled out and checked C24 and C26, they were good) or a faulty LM3900 (K3-4)? Thanks for any tips you can provide. <iframe width="560"...
  18. TCW

    Original Space Invaders RAM

    I am waiting to hear back from my supplier but wow am I confused. I ordered a replacement for my failed 14 Pin LM556CN, a LM556 was offered. Here is the photo used in the description - I was sent a 8 Pin NE555. How does that work, and why would I want it to? - Tom Update: They are...
  19. TCW

    Original Space Invaders RAM

    Good Lines are back and also pulses on Pin 7 and 9 on all four MUX, DM74153N's. Position A2 Pin 7 Pulse, Pin 9 Pulse Position B2 Pin 7 Pulse, Pin 9 Pulse Position C2 Pin 7 Pulse, Pin 9 Pulse Position D2 Pin 7 Pulse, Pin 9 Pulse I Reinstalled the test ROM V1.3 burned on a M2716-1F1, and it...
  20. TCW

    Original Space Invaders RAM

    The Solder bridge short took place at the chip I described but yes all the data lines being daisy changed as they are all were experiencing shorted data lines. Knowing that the RAM should be fine I'll get back into it in the morning. I'm bouncing between this, a Gottlieb Black Hole and a...
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