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Author Topic: Techmo Games  (Read 2933 times)

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Offline channelmaniac

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  • Few things are better than fixing an old game...
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Techmo Games
« on: May 07, 2014, 06:38:33 PM »
Model: Rygar
Symptom: Horrible audio quality

This is a non-JAMMA game and the owner supplied a homebrew JAMMA adapter to use with it.

Fixed a connection on the JAMMA adapter. It was using "Speaker +" and "Audio Ground" for the speaker connections instead of "Speaker +" and "Speaker -". The game's audio came up quite a bit but it was VERY noisy with lots of digital interference in the background.

Recapped the audio section of the board. One of the caps had leaked and the others were in horrible operating and physical shape. Replaced the 2 filter caps on the +5 lines on the top board. One had its solder pad lifted so it wasn't even in the circuit. Swapped out the 220uf @16v filter cap on the +12v line connecting to the final amplifier IC with a 470uf @16v cap.

The game still has some noise in the audio, but this is from the Yamaha ICs in the circuit and is also present on the MAME version of the game. The digital artifiact noise that was in the background is now fixed.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
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  • Posts: 2472
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  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: Techmo Games
« Reply #1 on: May 07, 2014, 06:38:46 PM »
Model: Silkworm
Symptom: Dead

Board had a short between +5v and ground, causing the power supply to shut down. Removed incorrect mounting hardware that was causing the short and replaced it. Tested game.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: Techmo Games
« Reply #2 on: May 07, 2014, 06:38:59 PM »
Model: Final Star Force
Symptom: Dead

Game was stuck in watchdog and would flash garbage on the screen before rebooting. Replaced bad Work RAM and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: Techmo Games
« Reply #3 on: May 07, 2014, 06:39:18 PM »
Model: Silkworm
Symptom: Single vertical line on screen

Board had a vertical line going from top to bottom of the screen, slightly left of center. Replaced bad DRAM chip at location B5 and tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

Offline channelmaniac

  • Surface mount soldering geek
  • Global NLG Site Moderator
  • NLG Member 501 to 10,000 Posts
  • *
  • Posts: 2472
  • Reputation Power: 174
  • channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!channelmaniac Is an-NLG GOD!
  • Few things are better than fixing an old game...
    • Arcadecomponents.com - Looking for hard to find chips?
Re: Techmo Games
« Reply #4 on: February 07, 2018, 08:20:04 PM »
Model: Silkworm
Symptom: Corrupt sprites

Cleaned corroded pins on the small daughterboard and replaced a bad 42 pin socket for it. Tested.
I have too many hobbies! Electronics, gunsmithing, Miatas, arcade games, metal detecting, etc...

http://www.arcadecomponents.com

 

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