(813) 944-4900
Facebook Email Instagram YouTube
  • NEWSLETTER

    HEY YOU, SIGN UP AND CONNECT TO LITTLE SHOP OF GAMES!

    Be the first to learn about our latest products and get exclusive offers!

    Will be used in accordance with our Privacy Policy

  • CONTACT US
  • FAQs
Facebook Twitter Email
Little Shop Of Games Little Shop Of Games
Login / Register

Sign inCreate an Account

Lost your password?
0 items / $0.00
Menu
Little Shop Of Games Little Shop Of Games
0 items / $0.00
Browse Categories
  • Machines For Sale
    • New Pinball Machines
    • Used Pinball Machines
    • Arcade Games
  • RENTAL
  • The Art Of Pinball
  • Official Stern Accessories
    • Stern Art Blades
    • Stern Toppers
  • Circuit Boards
    • Rottendog Boards
    • Alltek Boards
    • Ni-Wumpf Boards
  • Pinball Machine Parts
    • Flipper Rebuild Kits
    • Ramps
    • Playfield Plastics
    • Decals
    • Rubber Parts
    • Coils and Windings
  • Toppers
    • Stern Toppers
    • Acrylic Toppers
  • Shirts and Hats
  • GET ON THE LIST
  • NEW PINBALL MACHINES
  • USED PINBALL MACHINES
  • THE ART OF PINBALL
  • ARCADE GAMES
HomeShopCircuit BoardsCircuit Boards WPC 5v Power Reset Fix Board CLASSIC – 5 Volt Daughter Board by Kahr Circuits
Previous product
Dialed In! - Standard Edition Pinball Machine - Jersey Jack Pinball Machine $7,999.99
Back to products
Next product
Sega Star Wars Trilogy Plastic Set $175.00
IN STOCK

WPC 5v Power Reset Fix Board CLASSIC – 5 Volt Daughter Board by Kahr Circuits

$39.00

In stock

SKU: KAHR-5VOLT Categories: Circuit Boards, Electronics
Share
Facebook Twitter Email
  • Description
  • Additional information
Description

This circuit creates a unique 5 volt power source for the MPU board.  Resets happen on WPC pinball machines because the Driver Board’s 5 volt power supply is minimally sized for the many functions it needs to drive.  WPC series MPU Boards have a watchdog circuit that shuts down the board if the voltage on the 5 volt line drops below a cutoff voltage (around 4.7 volts).  When this happens the machine appears to unexpectedly turn off – immediately ending any active games. Interestingly, the watchdog shutting down the MPU board often sufficiently reduces the draw on the 5 volt power supply such that the voltage quickly recovers and the machine starts booting as if all were well once again.  Unfortunately all is not well – in some cases re-energizing the MPU board just as quickly pulls down the 5 volt power supply and the watchdog again turns off the MPU – creating an endless on/off reset cycle about every two seconds.  Even if your machine doesn’t enter this rapid “reset loop” but if your machine resets, your machine will experience additional resets – the periodicity of your reset loop may be minutes (or even an hour or more) but you are just waiting for the next reset.  

The WPC MPU Power Fix eliminates watchdog resets by moving the MPU load off the 5 volt line to the 12 volt line.  If you look at the WPC MPU Power Fix board, several pins are missing from the wire-side connector… this is because the Driver Board 5 volt line is no longer passed to the MPU.  Instead a switched regulator generates a very stable 5 volt supply that is used only on the MPU.  This reliably satisfies the watchdog circuit and therefore the MPU board is not reset.   

Other parts of your pinball machine still use the original 5 volt power supply so best maintenance practices such as replacing failed capacitors, burnt connector pins, and non-functioning rectifier diodes still must be performed. At long last, however, you no longer have to worry about every hundredth of a volt when conducting these repairs.

Manufactured by Kahr Circuits

Related

Additional information
Weight1 oz
Dimensions3 × 3 × 2 in

Related products

Sold out
WPC/WPC95 Battery Holder A-15814
Quick view
Close

WPC/WPC95 Battery Holder A-15814

Electronics
$7.95
Read more
Sold out
Quick view
Close

Ballast 14-20 Watt T-8 and T-12 Lamps 120 Volt 50 Hz

Electronics
$4.95
Read more
Williams/Bally LED Opto Assembly Set A-16908 and A-16909
Quick view
Close
IN STOCK

Bally Williams LED Opto Assembly Set A-16908 and A-16909

Electronics
$12.95
Add to cart
Quick view
Close
IN STOCK

Stern Dual-Opto Receiver Board With Grommets

Electronics
Stern
$8.95
Add to cart
Quick view
Close
IN STOCK

Stern Rocker Power Switch

Electronics, Switches
Stern
$4.95
Add to cart
Quick view
Close
IN STOCK

7-Opto Trough Board Set for Wide Body Bally Williams Super Pin Pinball Machine A-17982_A-17981

Circuit Boards, Circuit Boards, Electronics
Bally / Williams
$79.99
Add to cart
Quick view
Close
IN STOCK

William Bally Service Power Cord, power extension cable H-19601-1

Cabinet Parts, Electronics
$6.50
Add to cart
Sold out
Quick view
Close

8′ Power Cord

Cabinet Parts, Electronics
$8.50
Read more

FLORIDA’S FINEST PINBALL AND ARCADE STORES

24408 State Road 54
Lutz, FL 33559
Store: (813) 944-4900
Mobile: (813) 951-1602
Useful Links
  • Privacy Policy
  • Shipping
  • Returns & Exchanges
  • Terms & Conditions
  • Contact Us
  • Tour the Shop
  • FAQs
  • POS Login
Little Shop of Games 2020 CREATED BY JLE Solutions LLC.

Shopping cart

close
  • Menu
  • Categories
  • Machines For Sale
    • New Pinball Machines
    • Used Pinball Machines
    • Arcade Games
  • RENTAL
  • The Art Of Pinball
  • Official Stern Accessories
    • Stern Art Blades
    • Stern Toppers
  • Circuit Boards
    • Rottendog Boards
    • Alltek Boards
    • Ni-Wumpf Boards
  • Pinball Machine Parts
    • Flipper Rebuild Kits
    • Ramps
    • Playfield Plastics
    • Decals
    • Rubber Parts
    • Coils and Windings
  • Toppers
    • Stern Toppers
    • Acrylic Toppers
  • Shirts and Hats
  • GET ON THE LIST
  • NEW PINBALL MACHINES
  • USED PINBALL MACHINES
  • THE ART OF PINBALL
  • ARCADE GAMES
Scroll To Top