From Peter Wendt's MCA-Enthusiasts Page.
If you see little "Key Symbol" during the Power On process it means that the
machine has a "Power On Password" (POP) set.
How to clear Power On Password?
|8525 / 8530 (286-CPU)||Jumper J13|
|8525 (386-SX)||Jumper J2|
|8530 / 8540||Jumper J14|
|8550 / 8560 / 8570 / 8580||Jumper or cable at Speaker/Battery unit (see Note 1)|
|8555 / 8565 (386-SX)||Speaker Cable at Planar (see Note 2)|
|8556 / 8557||Jumper J18|
|8573 (P70 and P75)||Jumper close to MEM4 (see Note 1)|
|9533, 9535/9540||Jumper J20|
|9556 / 9557||Jumper JMP1 - Do not touch JMP2! (see Note 3)|
|9576 / 9577||Jumper JMP1 - Do not touch JMP2! (see Note 3)|
|9595 (Server 95)||Jumper JMP1
- Do not touch JMP2! (see Note 3)|
|9585 (Server 85)||Jumper J16 (?!?)|
Usually the systems have a 3-pin jumper. To erase the POP toggle the jumper -
cover mid-pin and the one currently not used. Leave the jumper in that position
until the password needs to be erased next time.
Locate the Speaker/Battery unit. The older version of that unit has a 2-pin
jumper at the left side - apply a short between the two pins and power
the machine on. Remove the short after the memory count finished and
the machine beeped.
Later models have a short thin black cable with an insulated connector at
the end hanging around on the unit. Use a piece of wire or a meter lead to
short to GND (power supply case, FDD, HD-Subframe etc.). Also power on
the machine and release the short after memory test completed and machine
Note 2: Locate the cable from the
planar to the speaker unit. Detach the cable at the planar,
turn it over by 180 degrees and plug it back into the planar connector.
Then power on the machine - password deleted. Leave the cable that way until
you need to erase the password next time...
The JMP2 enables / disabled the
"Privilege Access Password" (PAP).
Default is "PAP disabled". On various machines the PAP fulfills C2-Security
regulations and cannot be deleted except through entering the PAP again.
Once you'd accidently set a PAP and forget it - the planar must be replaced...
Therefore, hands off from this jumper.