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Power Supply Verification for the Model 400t, 4254 and

400dl Systems

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Note the followin information about the power supplyoperation before you

?perform the troub eshooting steps:

The power suppl delivers dc volts es to the CPU board and disk drives

‘%

when you press t e Power+n swtc on the front panel. The power-on

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switch activatesthe power supplyby ulling low a si nal line at Connector

7!J(H)4,Pin 8. (The signal line is norms Iyhigh when t e supply is off.)

When you

wer on the system, a relay within the power supplycloses to

ro@e ac vo tage to the display monitor outlet at the rear of the systemunit.

The system fan, which is housed in the rear of the power supply,is not a

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separate FRU. If the fan doesn’t operate, you must replace the power

supply.

Perfrom the followingsteps to troubleshoot the power supply. Youneed a volt-

meter and an ohmmeter to perform these steps.

NOTICE: Before ou replace the power supplyor a

relatedhU, ahva~checkthe~wersup

ly harness and ot er FRU cab es for loose,

Eroken, or pinched wires.

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4-16

Troubleshooting

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HP 425s Spezifikationen Seite 88