HP 200 Series Hardware Support Document page 55

Troubleshooting and Diagnostics 47
Fuses F2 to F4 Location
13. If the problem does not seem to be specific to backplane cards, refer to the Boot ROM Error
Codes. They are located in Table 8-3 and in Chapter 10.
14. If the Power On LED lights but the fan does not run, turn the computer off and disconnect
the fan. Then turn the computer back on and check the dc voltage across the fan terminal.
Fan Terminal Location
15. If the dc voltage across the fan terminals is about 19 V, the fan is defective. Otherwise, turn
the computer off and locate the cable between the 110 connectorboard and the power supply
(cable J2). Disconnect it from the connectorboard and check the -14V supply line (pin 8).
16. If the -14 V supply line is okay, the 110 connectorboard is defective. Otherwise, the power
supply is defective.