Could my 4000 just be "locked"?

[ShadesOfGrey]

My Amiga is seemingly dead...  Has been for quite some time.  The thing is, I was re-arranging all my 'old' computer stuff the other day and I noticed that the solder joint for one of the wires to the keyboard lock was broken.  When I took the lock out, the other joint broke off as well.  Now, before I go through all the trouble of reassembling the 4000 (It's all to pieces ATM), I want to make sure it's worth the attempt.

How does an Amiga 4000 behave when the keyboard lock is, well, locked?  Secondly, can I fool the 4000 into 'thinking' the lock is open by simply shorting the header on the motherboard?

[Castellen]

The lock function only disables keyboard and mouse movement input.
You can still input mouse clicks, and the system should still boot as normal.

The lock function works when the circuit is open, so if one of the wires is broken or the keyswitch plug is removed, then it will disable the lock function.

[ShadesOfGrey]

Thanks.  I figured that that would be the case.  I was hoping against hope that something this simple could be the cause of my unresposive Amiga.  Oh, well...  That's what I get for my optimism. :roll:

[Castellen]

To fault find the rest of it, just check all the power rails are present (you only really need +5V to make it work, +12V if you want to use drives).

Try a different CPU board, and check the two clock source jumpers are in the correct position.

If using an A3630, make sure you have the 25MHz(?) clock signal on both clock source jumpers.

Check both ROMs are correctly seated and don't have bent pins due to misinsertion.  Make sure the two ROMs are in the correct sockets :-P

If it's socketed, try a different 2Mb SIMM for the chip memory.  Remove all the fast mem SIMMs for now.


That's about as far as you can go without more serious test equipment.

The board should boot into the purple "insert disk" screen with only a 5V supply and nothing fitted to it except some chip mem.