Jump to content
Have You Played Atari Today?
2600|5200|7800|Lynx|Jaguar|Forums|Store  

coppertj

Members
 View Profile  See their activity

  • Content Count

    25

  • Joined

  • Last visited

Posts posted by coppertj

  1. Posted · Edited by coppertj

    34 minutes ago, Rybags said:

    I'd not seen this thread before.

    If there's no sound you can play the elimination game fairly easily.

    If you get keyclick then the sound circuit should be OK.

    If you have a tape drive then connect it and POKE 54018,52.  POKE 54018,60 in seperate lines.  That should generate a click, and sound circuit probably OK.

    Of course, no sound could also simply mean the TV's not tuned properly on RF.  Or wrong plug used if it's a monitor breakout cable.

     

    If you have an oscilloscope you could probe the audio pin direct from Pokey.

     

    GTIA bell (keyboard click) is not making it through the sound circuit, POKEY isn't getting the SIO cassette audio data/fails the POKE tests, and I already snipped off the pin 5 RF leg eliminating the RF modulator from the equation, I also probed the POKEY a couple months back but it was in spec. It's probably just that c19 capacitor which is on the SIO audio line. I have one shipping to me now.

     

    https://archive.org/details/Atari130XE_Schematics/

  2. Posted

    So I have an update, I finally got around to doing this 4 months later and I figured out all the resistors in the sound circuit are good and it wasn't a rf modulator short circuit. I measured all the capacitors resistance and found C19 (4u7) going to infinity. That should honestly be why the sound is not working because everything else in that circuit is correct. I'll keep this updated when I get around to replacing the capacitor.

  3. Posted

    Hi guys its been a while since i posted on the forums :D however,

    My sound (monitor output sound, don't have rf box) is not working.

    I did a couple measurements with the multimeter on the POKEY and it seems that it does have voltage output at pin 37 (read that on forum where someone had the same audio problem with their 130xe)

    Personally, I have a hunch that it's not the POKEY chip itself rather it's a capacitor or resistor in the sound circuit since I'm pretty sure POKEY handles I/O and keyboard scanning (both of which work tested the disk drive with emulation with aspeQt/SIO2PC, however cassette playback does not work.)

     

    So I guess my question is should I just skip trying to get a donor POKEY and attempt to troubleshoot the sound circuit (potentially just shotgunning the entire circuit and replacing it all until it works)?

    I would gladly accept any advice from anyone! Thank you!

     

    I have the schematic of all the resistor/capacitor values here http://www.jsobola.atari8.info/derelit/xefsm.pdf

  5. Posted · Edited by coppertj

    I just picked up a 1010 today and after setting it up it didn't play atari tapes. I thought the belt was broken until i played a music cassette with POKE 54018,52. So than I started fiddling with it and I noticed whenever you press the advance button it gets stuck and the 1010 produces a stuck hum like sound. Any suggestions?

     

    -EDIT-

     

    fixed. Was bad gear.

  8. Posted · Edited by coppertj

    Whilst I sometimes think I may hear Atari sounds in the static, I can't be too sure. It may just be the me hearing things in the sounds of the static, but not linked to the atari whatsoever.

    The TV just seems to not pick up the Atari signal whatsoever, even though I know it is on and working due to the LED shining on the console...

     

    Also, for future reference (and so I can learn a little more from this), what kind of things did you look at on the motherboard to check any problems? I.e. what are the "caps" you looked at?

     

    Thanks!

     

    these are caps: http://bushytails.net/~randyg/badcaps-choyo.jpg

     

    You said the wire is loose. How loose is it? If its really loose (like about to fall out loose) than just tighten the wire going around it the end of the wire. If that doesn't solve anything than it's most likely your TIA chip.

  11. Posted · Edited by coppertj

    Well, Lets try to problem solve. Did you try any other channels (2,3,4).

    If that doesn't work take a picture of your atari motherboard and post it on forums.

    I want to check if there's any visual problems.

     

    Also, atleast the power regulator is fixed :)

     

    Also Also, currently there could be a couple problems if the channels don't work. It could be bad caps, Could be a bad wire, or worst case scenario... TIA chip is dead.

     

    In other words, if the TIA chip is dead it usually means it's over just get another atari :(

     

    So cross your fingers if it's just a bad cap because caps are replacable and are low costing.

  12. Posted · Edited by coppertj

    I see that 3d printers are going down in price. Hopefully by next year we can get some consumer printers that are around 300-500 dollars.

     

    And the future begins: http://www.peachyprinter.com/#!methods/cjg9

     

    Also if you're bad at modeling in blender you are able to scan whatever you're trying to replace. So if a atari controller is broke you just put it in and scan it.

     

    Really fascinating I might buy one myself!

     

    -EDIT-

     

    This is also a cool 3d printer

     

    https://www.phoenix3dprinter.com/

     

    cheap and works very well.

  14. Posted · Edited by coppertj

    I just need to make sure a few things:

    • Did you open the console and measure the voltage from the power supply?
    • Was it measured while a cartridge was in or with no cartridge. If there was no cartridge put a cartridge and and test voltage again.

    Let me know what the results are from this.

     

    Also, TBH, you're better off just buying a new atari jr

    http://www.ebay.com/itm/Atari-2600-Jr-Black-Console-NTSC-console-only-/191337973263?pt=Video_Games&hash=item2c8ca1c60f

     

    I understand if you wouldn't want to attempt to spend extra money to fix this or, you just want to do this as a hobby project or something. But if you want to attempt to fix this I am more than glad to help you :-D

  20. Posted

    This is a fairly widespread problem. But I'd like to know if you tried all of this:

    • clean some games with 91% alchol
    • cleaned the atari cartridge connector

    You can find tutorials online on how to do these.

     

    Lemme know if you did these so I can make sure it's not the connectors that are doing it

     

    Also, if you could turn the atari on with no cartridge in and tell me what it does that can be very helpful too.

AtariAge
Forums
Store
General
Follow AtariAge

Copyright ©1998-2021 AtariAge

×
×
  • Create New...