HP 425s Specifications download pdf (Page 91)

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6. If the dc output voltagesare present at JW4, but not within tolerance,

perform the followingsixstepx

—

●

Power off the system and unplug the ac power cord from the wall

outlet. Replace the power supply.

If the problem persists,you must check for power loading. Power

off the system and unplug the pwer cord from the wall outlet.

Remove one option board @a hits, network, or HP-IB) from ita

board slot (refer to Chapter 5 or information about removing the

board). Plug the power cord into the ac wall outlet and power on

the system. Recheck the voltages. If necessary,re at this roce-

~ “ Lard,

dure for a second o tion board. If you replace a efectwe

confi re any switc es or ‘umpersthe same as on the original

boarflrefer to Appendix ).

If the cause of the problem isn’tan option board, power off the

system and unplug the power cord from the ac outlet. Reinstall the

board(s) in its slot.

Un lug connector P2 from the disk drive. Power on the system unit

8an recheck the voltages.If necessa

~ repeat thiss tep on a second

disk drive. Replace the disk drive if t e voltagesare now within

specifications(see Chapter 5).

If the problem persists, replace the CPU/Motherboard (see Chapter

5) and repeat this procedure.

After

you verifi that the power supplyvoltages are within the spcci-

‘d ‘nYM’r

wer off the sytem and unplug the ac cord from the

wall out et. eplace the s~tem unit cover. Make sure that all of the

internal connections are &cure.

7. If the dc output voltages are

within tolerance, perform the following

three steps

●

If the fan does not operate, replace the power supply.

If the displayoutlet ac voltage is incorrect, replace the power

supply.

If the wer LED is not on, re lace the Power-On SwitchPanel. If

the~

D still doesn’t light, rep ace these FRUS in the following

order

Ribbon Cable (mnnects LED board to CPU board)

LED Board

CPU Board

You can check the LED board and CPU board before you re lace

t!them by checking the power LED circuits for continuity, ass own

in Table 4-3. Check for contiunity with connectors J004 and JMt2

unplu&d. Refer to Figure 4-12 for the locations of the Connectom

and pms listed in Table 4-3.

Troubleshooting

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HP 425s Specifications Page 91

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