IBM iSeries 270 Service Manual page 599

AC power cords - all models: For use by authorized service providers.
Use this procedure to check the ac power cords on all models.
1. With the machine powered off, remove the power cord from the electrical outlet.
2. Check the power cord and power plug for visible cracks, wear, or damage.
3. Check for 1.0 ohm or less of resistance between the power cord ground and the power supply frame.
4. Ensure that the power cord is fully inserted and secured into position on the machine end.
5. Ensure that the power cord required for your country or region, and system is installed. See Determine
line cord, plug, and receptacle type in the Plan for hardware and software topic in Information Center,
to determine the power cable part number for systems in your country or region. This information is
also available in the Plan for hardware and software
book under the Power topic.
This ends the procedure.
AC safety grounds: For use by authorized service providers.
Use this procedure to check the ac safety grounds.
1. Ensure that all power supply mounting screws are tight.
2. Ensure that the mounting screws of the AC module or internal uninterruptible power supply are tight.
This ends the procedure.
Safety labels: For use by authorized service providers.
Ensure that all the safety labels are visible and readable:
v Main power rating attached to the right side frame at the back of the machine.
v 240 V AC attached to each 23 pin connector (J2 and J3) on AC modules that have SPCN connectors
(J15 and J16) (46G3576).
v Danger up to 240 V AC attached to the bottom frame under the power supplies (46G3575).
v Weight restriction label attached under the handle on the cover of the External Battery Backup Unit
(74F9976).
v Main power rating attached to the left side frame at the back of the machine.
v Danger up to 240 V AC attached to the bottom frame under each power supply (90H6275).
v Caution Lead Acid battery attached to side of internal battery unit (21H7089).
v Weight restriction label attached to top of internal battery (74F9976).
v Weight restriction label attached to top of power sub-frame assembly (74F9976).
v Models 640, 730 and S30 only: Two weight restriction labels attached to SPD/DASD cage sub-frame
assembly (74F9976).
v Two weight restriction labels attached to active back plane assembly (74F9976).
v Main power rating attached to back plate on external battery unit.
v Caution lead Acid battery label attached to back plate on external battery unit (21H7089).
v Weight restriction label attached to base at rear of external battery unit (74F9978).
Power off and on (system unit) - all models: For use by authorized service providers.
1. Ensure that the system powers off correctly.
2. Ensure that the system powers on correctly.
Internal mechanical inspection: For use by authorized service providers.
1. Ensure that air moving device (AMD) shields are installed on the AC module AMD assembly.
Analyze hardware problems
587