HP -65 Owner's Handbook Manual page 95

Service and Main
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1. Second program cannot easily be labelled.
2. Extreme care must be taken in protecting the second pro-
gram. (Do not clip more than you would on the first track
or you may lose information.)
3. The motor roller is over the second track. Over a period of
time, it may not read properly.
Improper Card Reader/Writer Operation
If your calculator appears to be operating properly except for the
reading or writing of program cards:
1. Make sure that the W/PRGM-RUN switch is in the correct
position for desired operation: RUN position for reading
cards; W/PRGM for recording cards.
2. If the drive motor does not start when a card is inserted,
make sure the battery pack is making proper contact and
has ample charge. Remember that the battery charger
alone does not deliver enough current to operate the drive
motor. A charger must be used in conjunction with a par-
tially charged battery in order to drive the card reader
motor. If the battery has been completely discharged, plug
in the charger and wait 5 minutes before attempting to
operate the card reader/writer.
3. If the card drive mechanism functions correctly, but your
HP-65 will still not read or write program cards, the trouble
may be due to dirty record/playback heads. Use the head-
cleaning card once as directed. Then, test the calculator
using the two diagnostic program cards furnished with it,
following the instructions provided. If difficulty persists,
your HP-65 should be taken or sent to an authorized
Hewlett-Packard customer service facility.
CAUTION
Cards can be accidentally erased if subjected to extreme
magnetic fields (magnetometers at airports
are in the safe range).