Replacing Batteries
Warning
• The battery compartment only accepts AA size batteries. See the Accessories section
for reordering of parts information.
Open the battery compartment by depressing the tab and pulling outward on the battery
door. Remove the existing drained batteries by pushing on the end of the battery that
compresses the battery contact spring and lift upwards. It is acceptable to carefully use a
simple tool, such as a pen, to assist in lifting the batteries out.
Replace the batteries by paying close attention to the polarity indicators on the battery and
the polarity indicators on the battery holder in the compartment. Positive (+) aligns with
positive (button) and negative (-) aligns with negative (spring). Insert the battery such that
the spring contacts are loaded first and then press the battery firmly into place. After all
three have been inserted, replace the battery door.
Warning
• If the batteries have been inserted incorrectly, the unit will not function but the TRIA
®
II
will not be damaged.
Batteries slide into compartment
Turning Unit On/Off
Turn the unit on by pressing the On/Off button. LED or LCD indicators (depending on the
model) indicate power status.
The TRIA
®
II automatically shuts itself off after 3 minutes if it is not being used. This
complete power shutdown preserves the life of the batteries and ensures the unit will be
ready for operation in case it was accidentally left on.
Diagnostic Monitoring (LCD Display units only)
Once the unit is on, the TRIA
®
II TR250 perform a series of diagnostic checks.
The unit first checks and temporarily displays the frequency of the probe that is being used.
This display will not reappear unless the probe is changed or the power is cycled, in which
case the display will again temporarily confirm the frequency of probe that is connected.
The unit then checks for proper internal operating temperature, battery voltage, reference
voltage and power supply voltage levels. If any of these characteristics are out of range,
the display will show the ERROR indicator and a failure code associated with the diagnostic
error. Diagnostic functions are periodically checked while the unit is on to ensure the
Doppler is operating at peak performance. Refer to the Troubleshooting section for a listing
of failure codes.
HEART RATE
INDICATOR
PROBE FREQUENCY
INDICATOR
ERROR INDICATOR
DIGIT DISPLAY AREA
SIGNAL QUALITY
INDICATOR
RECORD
INDICATOR
PLAY
INDICATOR
BATTERY
LEVEL/RECHARGE
INDICATOR
11
6
LCD Panel for TR250 Display Units Only
