- 01orig_sm.jpg (288.9 KiB) Viewed 2256 times
- 02front_orig1_sm.jpg (211.35 KiB) Viewed 2256 times
- 09back2_sm.jpg (155.2 KiB) Viewed 2256 times
- 10side2_sm.jpg (179.67 KiB) Viewed 2256 times
It turned out to be an Oak Full Travel Membrane board:
- 25switch1_sm.jpg (126.85 KiB) Viewed 2256 times
When I tested the matrix it turned out that a number of keys didn't work properly so I decided to take it fully apart, clean it and see if I could reassemble it and get it working.
- 03open4_sm.jpg (246.13 KiB) Viewed 2256 times
- 04open2_sm.jpg (501.75 KiB) Viewed 2256 times
Keyboard module:
- 05module_front2_sm.jpg (259.09 KiB) Viewed 2256 times
- 06module_back1_sm.jpg (210.73 KiB) Viewed 2256 times
PCB:
- 07PCB_1_sm.jpg (1.01 MiB) Viewed 2256 times
- 08PCB_2_sm.jpg (562.64 KiB) Viewed 2256 times
The switched are held directly to the metal plate by melted plastic rivets through the keyboard membrane. I used a wood chisel to cut off the rivet heads and remove the switches and the membrane.
- 19switches_off_sm.jpg (226.55 KiB) Viewed 2256 times
- 11membrane_front1_sm.jpg (358.43 KiB) Viewed 2256 times
- 12membrane_back1_sm.jpg (369.23 KiB) Viewed 2256 times
A plunger presses a central spring against the membrane to active the switches.
- 13switch_detail2_sm.jpg (157.72 KiB) Viewed 2256 times
- 14switch_detail_1_sm.jpg (135.09 KiB) Viewed 2256 times
- 15switch_bottom1_sm.jpg (199.36 KiB) Viewed 2256 times
- 16switch_bottom2_sm.jpg (186.82 KiB) Viewed 2256 times
The Shift Lock and Caps Lock are latching switches:
- 26lock_switch_off1_sm.jpg (97.62 KiB) Viewed 2256 times
- 27lock_switch_off2_sm.jpg (103.68 KiB) Viewed 2256 times
- 17locking_switch1_sm.jpg (103.63 KiB) Viewed 2256 times
- 18locking_switch2_sm.jpg (98.21 KiB) Viewed 2256 times
The membrane parts are glued together so I did not attempt to separate them. When I tested the membrane out of the board, however, all the switches were working. After cleaning the membrane, switches and springs, I began to reassemble the board. I used clear silicone sealant (same as used as an aquarium sealant) to hold the switch pegs in the plate. I chose this because I found it held the switches firmly enough, but still allows for removal of the switches and easily cleans off plastic.
- 20gluing_switches_sm.jpg (627.11 KiB) Viewed 2256 times
- 21`switches_glued_sm.jpg (202.1 KiB) Viewed 2256 times
To connect the membrane I used trio-mate 17pos connectors, breadboard pins and prototype board:
- 22connector_parts_sm.jpg (121.62 KiB) Viewed 2256 times
Wired up the Teensy:
- 23Teensy_sm.jpg (269.56 KiB) Viewed 2256 times
Then reassembled the case. I did touch up the case with sage green spray paint which matched quite well. I haven't done the edges of the black front plate yet though.
- 28finished0_sm.jpg (356.88 KiB) Viewed 2235 times
- 24finished2_SM.jpg (291.56 KiB) Viewed 2256 times
This is the matrix I came up with:
- Matric_current.jpg (246.61 KiB) Viewed 2256 times
The switches are linear, rather heavy and and overall I would say very "meh." It was still worthwhile imo, however, since I had never had the chance to try these switches before and it did make for a fun little project.
Quick video of banging away on board:
So I'd assume they server no real purpose?