HP HP-65 - Appendix C Service and Maintenance; Calculator Checkout Procedure; Low Power; Blank Display

Appendix C
Service and Maintenance
Calculator Checkout Procedure
Note
Charge battery pack before portable use.
A rechargeable battery pack is provided with your calculator.
The calculator will operate while charging; however, be sure to
fully charge the battery pack for 14 hours before portable use.
Charge in either ON or OFF position.
CAUTION
Calculator can be damaged by strong static charge.
Low Power
All decimal points light to warn you that you have 2 to 5 minutes
of operating time left on battery power. You must then either:
1. Operate from ac power.
2. Charge the battery pack.
3. Insert a fully charged battery pack.
Blank Display
If the display blanks out, turn the HF-65 off, place the
W/PRGM-RUN switch in RUN position, and turn the HP-65
back on. If 0.00 does not appear on the display, check the fol-
lowing:
1. Examine the battery pack to see if it is discharged and
whether it is making proper contact with the calculator.
2. If the display is still blank, try operating the HP-65 from
the ac line.
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