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Full title: [PS/2][US][1992.08.18](Lexmark brand)IBM Model M2 1395300(FCCID ANO2155-02)
FCC ID: ANO2155-02
MFD: 1992.08.18, 1993.08(from PCB)
Sort: 半機械薄膜式(Half mechanical membrane)
Switch: Buckling spring over membrane
This topic I posted on my facebook page half years ago. For some reason someone have problem about this keyboard, so I posted here to give some quality photo and replacement here.
This is my second IBM Buckling spring keyboard. Many keyboard with this model original couldn't use on computer when it released(maybe).
I take the half day to clean the keyboard fully and half day to do these steps:
1. repaired the capacitors error;
2. used the 3M electronic tape to fix the PCB(because I broken the PCB plastic lock), membrane and the piece of dome;
3. used the 3M electronic tape to fix the spring to the front case(for the future to open the case easily);
4. finished
The PBT keycaps are low profile compare to Model M's. They're dye sublimation printing.
-How to fix the capacitor failure (situation for Caps and Scroll Lock are lighting on)
1. Replace two electrolytics:
(Small one)Replace 2.2uF 50v to 2.2uF 100V electrolytic(電解電容)
(Big one)Replace 47uF 16v to 47uF 16V tantal(鉭質電容)
2. Connect the USB to PS/2 converter into the keyboard(if occurs problem, plug usb out and try again)
-Found problems(fixed)
Enter = Enter + \
(remove left spring can fix this)
Numerical pad: Enter = Enter + F7
(remove upper spring can fix this)
capacitor repaired reference:
https://geekhack.org/index.php?topic=5065.0
back case
stander level 1
same label with this(cause my keyboard lost its label)this photo from http://www.instructables.com/id/Clean-y ... /?ALLSTEPS
screw type_Robertson(Yellow No.3&4)
stander level1
stander level2
without keycaps
hard disk jumpers x10 for two side.(Becase I broken the PCB lock which is use for fix the PCB on the back case)I used the Pattex contact adesive to make these stuffs together. The result was they can withstand the PCB and front case when assemble the keyboard.
used the 3M electronic tape to fix the spring to the front case(for the future to open the case easily)
forgot to capture this, this photo was from:
http://www.instructables.com/id/Clean-y ... /?ALLSTEPS
forgot to capture this PCB plastic lock, this photo was from: http://www.instructables.com/id/Clean-y ... /?ALLSTEPS
PCB
back of PCB
two old electrolytics_front
two old electrolytics_back
new electrolytics
flat rubber dome, membranes, aluminium foil
flat rubber dome
layer1&2 membrane
layer3 membrane
aluminium foil_front
aluminium foil_back
back case inside
low profile keycaps
compare of original Model M and M2 keycaps:
57_left(M2), right(Model M)
Model M keycap can fit in M2
Tool1: Robertson driver
Tool2: This metal tip can help to handle the 3M tap on the front case(brought from AEON)