HP 200 Series Hardware Support Document page 64

56
Troubleshooting and Diagnostics
Self-test LEDs Location
3. If the LEOs do not display 44, swap the processor board. Then recheck the self-test LEOs. If
they now display 44, the processor board was defective. If they still do not display 44, the I/O
connectorboard is defective.
4. If the LEOs display 44, switch the computer off and re-install the RAM card containing the
top 16K bytes of RAM into the computer. It is the one with the address switch segments all
set the .same.
5. Tum the computer on and observe the self-test LEOs. If the LEOs go through to 00 (all off),
reinstall the remaining accessory cards one at a time, turning the computer off before each
one.
6. Tum the computer on and observe the LEOs during self-test after installing each card. The
card which prevents self-test from running through to 00 is defective.
7. If the LEOs do not go through to 00, recheck fuses F2 to F4. If they are all okay, the RAM
card is probably defective. Try a different RAM card.
8. If more than one fuse is open, the I/O connectorboard is defective. If only one fuse is
defective, move the RAM card to a different, non-adjacent slot. Tum the computer on for a
few seconds, then check the two good fuses. If they are both good, the connectorboard is
defective. If one is open, the RAM card is defective.