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JAMMA Test Card

Regular price $79.99 CAD
Regular price Sale price $79.99 CAD
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The JAMMA TestCard, is a small JAMMA board that lets you test and troubleshoot JAMMA cabinets, or any other cabinet with the addition of a JAMMA cabinet adapter. Simply plug it into your JAMMA harness and you can start testing immediately. The card can be powered from the cabinet power supply or the built-in 3V battery.

The TestCard can display diagnostic information on either the cabinet monitor, or its own backlit dot matrix LCD screen. This means that the tests can be performed in a cabinet with a dead monitor, a dead power supply, or both.

This can come in handy in a number of circumstances, whether you’re building your own cabinet and want to test it long before it's fully functional, or you want to test a cabinet in an unknown state before purchase, and don’t want to risk testing with with and possibly damaging a real arcade game PCB.


Video and sync signals:
- RGB and SYNC at 3V-pp
Sync Types:
- Negative CSYNC – JAMMA standard
- Amplified audio (up to 1 watt)
- Square wave, multiple frequencies
Input Switches:
- 2 Player Joystick Directions
- 6 Buttons per Player plus 2 Start Buttons
- all Coin, Service, Tilt, Test switches

Video Generation

15kHz – standard arcade mode only

Battery Life

About 3 hours battery life on a good quality CR2032 (depending on the pattern / type of use / monitor)


Standard JAMMA pinout


Board Size: 113x100 mm
Weight: 120g

Shipping & Returns

Standard 30 days return policy. Buyer pays for return shipping. See Return policy page for more information.

JAMMA Test Card Features and Additional Information

List of Test Functions

  • Power Supply (Voltages)
    • +5V Voltage Check
    • +12V Voltage Check
    • -5V Voltage Check
    • Built-In Battery Voltage Check (replace battery below 2.7 volts)
  • Controls Test
    • Player 1 and 2 Joystick Directions
    • Player 1 and 2 Buttons 1-6 (via JAMMA edge or SF2 kick harness)
    • Player 1 and 2 Start Button
  • Switch Test
    • Coin 1 and Coin 2 Switches
    • Test, Service and Tilt Switches
  • Monitor Test
    • Color Bars - Check whether RGB color present and balanced.
    • Line Grid - Geometry and convergence.
    • White Box - Burn in and brightness check.
  • Sound Test
    • Generate Square Wave - Beep at frequencies from 60Hz to 8KHz
    • Frequency Sweep - check for damaged speaker or distortion.
  • Output Functions (NOT AVAILABLE)
    • Coin Lock Out coils cannot be tested.
    • Coin Counters can not be tested.

Dual Display:

If the cabinet monitor is dead or malfunctioning, you’ll still be able to gather some information on the remaining state of the cabinet by checking the TestCard's built-in backlit LCD display. All functions and feedback are displayed on both the monitor and the LCD. The backlit LCD can be turned on in dark environments, or turned off when not needed or to improve battery life.

Battery Powered:

The JAMMA TestCard can be optionally powered by a 3V button battery and will allow you to check the monitor and control switch functionality even if the power supply inside the cabinet is dead.

Built-In Video Game:

A simple breakout style game has been included for some entertainment as a bonus, but it can also be used to test long term stability of the cabinet as you attempt to beat the high score or simply leave it in demo mode.

Easy to Fix:

There are only 6 socketed ICs on the TestCard, the microcontroller and 4 ICs that deal with the inputs and protect the MCU from the dangers of a potentially messed up cabinet. Most of the active components, with the exception of the voltage regulator, are socketed and can be replaced easily if needed.

Test Procedure:

To use the TestCard, plug it directly into cabinet's JAMMA harness, or use a cabinet adapter to test a non-JAMMA cabinet. Leave the TestCard power switch on PSU, and set the LCD backlight switch as desired. The backlight should be off at this point.

Turn the cabinet ON. If nothing shows up on the TestCard's LCD display, it's likely that the cabinet isn't getting power (check plug, fuses, power switch, etc...) or that it has a bad power supply. Only the 5V power rail is required for most tests.

If power can not be restored, switch the TestCard to battery operation by putting the power switch on BATT. Some tests will not be available in this mode. Run Voltage check to see if any voltages are present. 

Check whether the monitor is able to display anything, and if not continue to use the LCD display to complete the tests. Press the MODE (or hold Start) and TEST (or hold Button 1) buttons to cycle through the available test modes and troubleshoot as needed.

  • Color Boxes Monitor Test

    Displays primary and secondary RGB boxes.

  • Line Grid Monitor Test

    Geometry and Convergence Check.

  • White Box Monitor Check

    Burn-In, Bloom, Brightness Level Checks.

  • Voltage On-Screen Test

    Test JAMMA voltages.

  • Controls On-Sreen Test

    Check joysticks, buttons and switches in the cabinet.

  • Sound On-Screen Test

    Generate some beeps or sweeps to test the speaker.

  • Voltage LCD Test

    Test JAMMA voltages.

  • Controls LCD Test

    Check controls on the LCD display.

  • Video LCD Test

    The LCD tells you what's going on even when the monitor is dead.

  • Play OSMO

    The built-in game.

  • Fun Time!

    Enjoy this Breakout meets Bust a Move and Tetris unique hybrid game designed specifically for the TestCard.

  • Over a Dozen Levels!

    Take a break from testing to have a little fun, and see how far you can get.

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