A 61-key layout
The picture follows the standard 60% ANSI arrangement: 61 keys, the main block of a full-size keyboard without the function row, arrows, navigation keys or number pad. An ISO 60% board has 62 keys, and the ISO button above draws it. Esc shares its key with ` and ~, and Fn sits in the bottom row, drawn dashed because it never leaves the keyboard.
Test the base layer first: press every key until the score reaches 100%. Every switch on the board has then registered at least once.
Testing the Fn layer
The keys a 60% board leaves out live on layers: hold Fn and press another key for an arrow, an F-key or Delete. The keyboard sends the same codes a full-size board would, so the tester can check them too. They don’t have a place in the picture, so they appear under Other keys detected, and the event log shows each one’s name.
Layers differ between boards. The default firmware of the Keychron Q4, a 60% board, puts the arrows on Fn with K, M, comma and period, and F1 to F12 on a second Fn key with the number row. The HHKB uses Fn with [, ;, ' and / for the arrows. Check your manual, press each layer key, and look for the name you expect.
A layer key that sends the wrong key, or nothing, while the same physical key works on the base layer, is a keymap problem rather than a broken switch. Fix it in your keyboard’s software, such as VIA for QMK boards, and test again.
The Esc and tilde key
Most 60% boards drop the ` ~ key and fold it into Esc. With QMK’s Grave Escape the key sends Esc, but ` while the Windows or Command key is held and ~ with Shift. The event log tells you which one arrived: Escape or Backquote. On a Mac, Command+` switches between windows, so it may not type a backtick in other apps even though the tester sees the key.
What this layout leaves out
The keyboard above has 61 keys, and the score counts 60 of them (the dashed keys don’t reach the browser). The tester’s full-size layout has 104. These are the ones this layout doesn’t draw; if you press one through an Fn combination, it appears under “Other keys detected” instead of lighting up the picture.
- Function keys: F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12
- System keys: Print Screen, Scroll Lock, Pause
- Navigation keys: Insert, Home, Page Up, Delete, End, Page Down
- Arrow keys: Arrow Up, Arrow Left, Arrow Down, Arrow Right
- Number pad: all 17 keys
- Other keys: Right Win