ACU-RITE DRO 100 Reference Manual page 21

Troubleshooting
Working memory—the memory used by the readout for calculations is faulty.
While it may be possible to use the readout, it's position display and other
information will not be reliable.
!
The readout cannot be relied on for correct operation if any
memory failure is indicated. The readout should be serviced
immediately.
Program memory—the memory used to store the software is faulty. While it
may be possible to operate the readout, some functions will not work properly and
incorrect information may be displayed.
!
The readout cannot be relied on for correct operation if any
memory failure is indicated. The readout should be serviced
immediately.
Internal Testing
Several internal tests may be performed to ensure that the readout is functioning
properly. Tests are available for the internal memory, the keypad, and the
display. In addition, the testing procedure reports the software version of the
readout.
Begin the internal testing by holding down the
The software version will appear in the display
Keypad test Begin by pressing the (upper)
the key) in turn to verify that it is functioning properly. When a key is
ZERO
pressed, the display activates a "plus sign" indicator and increments a count.
When you release the key, the plus sign disappears.
MEMORY FAILURE [2] – PRESS CLEAR
CAUTION
MEMORY FAILURE [3] – PRESS CLEAR
CAUTION
16
RAD
key for about 2 seconds.
DIA
key, then press each key (except
ZERO
DRO 100