IBM 3270, User Manual, Page: 36 / 58

4. Check power cords for the following:
Ÿ
Each power cord must have a third-wire ground connector in
good condition. Use a meter to measure third-wire ground
resistance for 0.1 ohm or less between the external ground
pin and the frame ground as specified in the system
hardware maintenance manual.
Ÿ
The cord set should be the appropriate molded type as
specified in the system hardware maintenance manual.
Ÿ
The insulation must not be frayed or worn.
5. Refer to the operator’s manual or hardware maintenance manual
for the personal computer being serviced for the proper system
unit cover removal procedures.
6. Check for any obvious unsafe alterations. Use good judgment
as to the safety of any alterations.
7. Check inside the unit for any obvious unsafe conditions, such as:
metal filings, contamination, water or other liquids, or signs of fire
or smoke damage.
8. Check for worn, frayed, or pinched cables. Ensure the voltage
specified on the voltage tag (back panel of the unit) matches the
voltage of the power receptacle. If in doubt, verify the voltage.
9. Examine the power supply and verify the following:
Ÿ
That the input voltage selection switch is set correctly on the
universal power supplies.
Ÿ
That nonremovable fasteners in the power-supply cover have
not been removed or tampered with.
Ÿ
That the grommet is installed where the internal power
cables come through the frame of the power supply.
10. Check for the following labels:
Ÿ
On all system power supplies:
“Caution Hazardous Area. Do Not Remove This Cover.
Trained Service People Only. No Serviceable Components
Inside.”
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3270 Emulation PCI Adapter User’s Guide