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Service Guide ML320/ML321
Chapter 4 Failure & Repair Analysis
4.4
TROUBLESHOOTING TIPS
4.4.01 Preliminary Checks
Is the product being operated under the proper ambient conditions?
Does the paper being used meet the specifications for this product?
Has the ribbon been replaced as recommended?
Has the ribbon been installed properly?
Is an Okidata ribbon being used?
Is the printhead gap correctly set?
Check the contacts between the power interconnect module, the control board, and the
power supply board (Rev A and B units ONLY). Clean the contacts if dirty. If contacts are
bent or broken, replace the module. Proper inspection and cleaning of the power interconnect
module contacts can eliminate a false diagnosis of a failed control board or power supply board.
Check the contacts and connections of the control board. If good contact is not made
at all connections and ground points, false diagnosis will occur.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
