Main Restorations Software Audio/Jukebox/MP3 Everything Else Buy/Sell/Trade
Project Announcements Monitor/Video GroovyMAME Merit/JVL Touchscreen Meet Up Retail Vendors
Driving & Racing Woodworking Software Support Forums Consoles Project Arcade Reviews
Automated Projects Artwork Frontend Support Forums Pinball Forum Discussion Old Boards
Raspberry Pi & Dev Board controls.dat Linux Miscellaneous Arcade Wiki Discussion Old Archives
Lightguns Arcade1Up Try the site in https mode Site News

Unread posts | New Replies | Recent posts | Rules | Chatroom | Wiki | File Repository | RSS | Submit news

« previous next »
Pages: [1]
  
Go Down

Author Topic: Humming noise coming from power supply  (Read 2398 times)

0 Members and 1 Guest are viewing this topic.

Wir3d

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 39
  • Last login:October 31, 2007, 04:41:45 pm
  • Huh?
Humming noise coming from power supply
« on: March 14, 2006, 06:42:38 pm »
The humming noise only happens when the jamma harness is unplugged from the PCB.
its in a MK 2 cabinet btw....any solutions as to why this is happening? its more like a pig squealing noise.
« Last Edit: March 14, 2006, 07:09:06 pm by Wir3d »
Logged

Wir3d

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 39
  • Last login:October 31, 2007, 04:41:45 pm
  • Huh?
Re: Humming noise coming from power supply
« Reply #1 on: March 14, 2006, 07:29:04 pm »
My neutral (white) wire coming from my power cord is getting 120V and my black (hot) wire is reading 0 on my tester..could this be a problem?
Logged

SirPeale

  • Green Mountain Man
  • Global Moderator
  • Trade Count: (+23)
  • Full Member
  • *****
  • Offline Offline
  • Posts: 12963
  • Last login:August 04, 2023, 09:51:57 am
  • Arcade Repair in New England
    • Arcade Game and Other Coin-Op Projects
Re: Humming noise coming from power supply
« Reply #2 on: March 14, 2006, 09:31:25 pm »
Quote from: Wir3d on March 14, 2006, 07:29:04 pm
My neutral (white) wire coming from my power cord is getting 120V and my black (hot) wire is reading 0 on my tester..could this be a problem?

That's backwards.  White is hot, black is neutral.

No, you're hearing noise because you've taken the load off it.

Squealing from a PS isn't good in any event.  Likely it has bad caps.  I suggest either replacing it, or recapping it.
Logged

Wir3d

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 39
  • Last login:October 31, 2007, 04:41:45 pm
  • Huh?
Re: Humming noise coming from power supply
« Reply #3 on: March 14, 2006, 10:38:56 pm »
ok, thanks peale, and ive tested the voltage on the +5v -5v +12v and there all giving me a reading of about 1.8v when powered on, so i think the power supply is bad
Logged

Ken Layton

  • Guru
  • Trade Count: (+1)
  • Full Member
  • ****
  • Offline Offline
  • Posts: 7061
  • Last login:October 12, 2021, 12:25:59 am
  • Technician
Re: Humming noise coming from power supply
« Reply #4 on: March 15, 2006, 02:06:17 am »
You have a power supply that REQUIRES a load be connected to it at all times it's powered on. WARNING: it will be damaged if you leave it that way. Either unplug the AC power going into it or connect a gameboard to that power supply now.
Logged

Wir3d

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 39
  • Last login:October 31, 2007, 04:41:45 pm
  • Huh?
Re: Humming noise coming from power supply
« Reply #5 on: March 15, 2006, 05:29:48 pm »
my power supply was making the whining noise when it was connected to the board...i bought it from tnt amusements...it was used and i only paid $6 for it, its a peter chao....after i heard the whining noise i decided to disconnect the jamma harness and try it that way, but it made no difference.
Logged

Ken Layton

  • Guru
  • Trade Count: (+1)
  • Full Member
  • ****
  • Offline Offline
  • Posts: 7061
  • Last login:October 12, 2021, 12:25:59 am
  • Technician
Re: Humming noise coming from power supply
« Reply #6 on: March 15, 2006, 06:42:33 pm »
If it's a Peter Chou with screw terminals, then the whining noise is because it needs capacitors now (they are about to explode). Peter Chou with screw terminals are one of the few power supplies that can be run without a load connected.
Logged

Wir3d

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 39
  • Last login:October 31, 2007, 04:41:45 pm
  • Huh?
Re: Humming noise coming from power supply
« Reply #7 on: March 15, 2006, 08:55:36 pm »
yes it has screw terminals....the model number of the power supply is #F102141288....and what caps do i replace on it? all of them incuding the small ones or just the bigger ones?
Logged

SirPeale

  • Green Mountain Man
  • Global Moderator
  • Trade Count: (+23)
  • Full Member
  • *****
  • Offline Offline
  • Posts: 12963
  • Last login:August 04, 2023, 09:51:57 am
  • Arcade Repair in New England
    • Arcade Game and Other Coin-Op Projects
Re: Humming noise coming from power supply
« Reply #8 on: March 15, 2006, 09:46:16 pm »
If you open it you may see that they're bloated.  Those ones are obvious.

Generally, it's the larger caps that go.  If/when you replace them, replace them with hi-temp caps! 
Logged
Pages: [1]
  
Go Up
« previous next »