IBM V03 Maintenance Information page 76

Electrostatic discharge (ESD)
Intermittent problems can also be caused by build up of electrostatic charge on the forms or bad electrostatic
ground (ESD) connections. If you suspect the forms, contact level 2 support for guidance. If you suspect the
problem is caused by a bad ground, perform the following check, perform Ground connectors check.
Set the meter to the lowest resistance scale and measure for 0.1 ohms or less between the ground pin of the
power cord and the following parts:
Attachment
Ensure that the printer is not operated with loop-back connectors installed.
Refer to the signal cable ordering information in the IBM 4247 Model V03: User's Guide , for attachment cable
configurations.
Environmental requirements
See Environmental requirements.
Miscellaneous
Check for lost screws under the power supply or under the logic board.
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Chapter 1. Diagnosing problems