IBM 4247, Maintenance Information

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If an electrical accident occurs:
– Use caution; do not become a victim yourself.
– Power off (O) the printer.
– Send another person to get medical aid.
Pre-Service Inspection
The intent of this inspection guide is to assist you in identifying potentially unsafe conditions on these products.
Each machine, as it was designed and built, had required safety items installed to protect users and service
personnel from injury. This guide addresses only those items. However, good judgement should be used to
identify potential safety hazards because of attachment of non-IBM features or options not covered by this
inspection guide.
If any unsafe conditions are present, you must determine how serious the apparent hazard could be and whether
you can continue without first correcting the problem.
The guide consists of a series of steps presented in a checklist.
Checklist:
1.
a. Check exterior covers for damage (loose, broken, or sharp edges).
b. Check top main cover Interlock operation. See T&D19 - Top Cover Interlock Test.
2. Ensure that all safety labels are in place.
3. Inspect the customer’s power source/receptacle. See
Electrical Safety for IBM Customer Engineers,
S229–8124.
4. Ensure that any Safety EC’s have been installed properly.
5. Power off (O) the printer. Disconnect the power cord. Check the power cord for:
a. A third-wire ground connector in good condition. Use a meter to measure the third-wire ground continuity
for 0.1 ohm or less between the external ground pin and frame ground. The power connector ground wire
is fastened with a screw and star washer near the power supply. Repair as needed.
Safety Information
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