5 Oct
2011
5 Oct
'11
2:09 p.m.
I HAVE seen stock 5170s with a cam on the lock.
Mine certainly does
But, I can't say whether they all had a cam, since
who the hell would LOCK
it??
The Hardware Maintenance and Service manual for the PC/AT (the only IBM
boardswapper book I have) says they have a case lock, and gives the
procedure for removing the lock from the LED panel. But that assumes
you've got it open.
The case MIGHT have enough flex to get it open once the screws are out
with minimal damage.
Once it is open, take out the screw on the back of the cam lock, and flip
the cam over, so that neither of its two positions engages the strike.
The only ptoblem is that the actuator operates a microswitch too, to
disable the keyboard. You will have to open/short this if you remvoe the
actuator.
I'd unlock it or repin it. This involves dismantling the lock itself.
Basically, from ehat I remmeber :
Remvoe the LED/swithc panel from the machine (3 screws), then unscrew the
microswithc fixings, remove the nut from the back of the lock, take off
the actuator, peel off the label on the front, pull out the locking clip
and slide the lcok out (this is in the IBM manual).
On the side of the lock you'll see a pin, about 1/8" in diameter. Drill
this out cafefully. The lock then comes apart from the back. It's like a
Yale (cylidner) lock rearranged round the disk, of course. 2 pins in each
hole with a springe behind them The notches in the key push the pins to
the right depths so that the division between the pins lines up with the
back surface of the (rotating) disk.
To re-pin the lock, all you have to do is make new pins of the right
lengths to suit a key you have. This is not difficult. Nor is making a
new pin to hold the thing together to replace the one you drilled out.
-tony