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Appendix C: Service and Maintenance 92
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Minimize the exposure of your calculator to dusty, dirty environments by storing it in the soft
carrying case when not in use. Each card pack contains one head cleaning card. |
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The magnetic recording head is similar to magnetic recording
equipment. As such, any collection of dirt or other foreign matter on
the head can prevent contact between the head and card, with consequent
failure to read or
write. The head cleaning card consists of an abrasive underlayer
designed to remove such foreign matter. However, use of the card without
the presence of a foreign substance will remove a minute amount of the
head itself. Thus, extensive use of the cleaning card can reduce the
life of the card reader in your HP-65. If you suspect that the head is
dirty, or if you have trouble reading or writing programs, by all means
use the cleaning card; that’s what it is for. However, if one to five
passes of the cleaning card does not clear up the situation, send your
calculator in for service.
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Annotating a Card
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You can write on the non-magnetic side of your card using any writing implement that does not emboss the
card. It is customary to write a program name on the top and to write symbols identifying the functions
of the top row keys in the spaces below. Annotating magnetic cards with a typewriter may impair the read/write
properties of the cards.
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Using Alternate Track
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It is possible to store a program on the opposite edge of a card (and to later read it) by inserting
the other end (opposite to the arrowhead), face up. Thus, a card can hold two 100-step programs.
However, we recommended that you use only one track since:
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1.
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Second program cannot easily be labelled.
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2.
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Extreme care must be taken in protecting the second program. (Do not clip more than
you would on the first track or you may lose information.)
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