Replacing The Rtc Battery; Replacing The Internal Main Battery - Reftek 180-SM 2 Series User Manual

Rev 1.0

5.3 Replacing the RTC Battery

The CPU board has a 3.6 volt back-up battery for the Real-Time Clock (RTC), located on
the CPU board itself. If the Web UI status shows less than 2.2 volts for the battery it
should be replaced.
1. Hold the magnet over the REF TEK triangle until the LCD indicates the unit is shutting down.
2. Wait until the LCD screen goes blank and the power LED turns off.
3. Disconnect all cables.
4. Remove the screws from each corner of the top of the unit.
5. Pull the cover off the unit. This will disconnect the internal interface board from the rest of
the board stack.
6. Turn the top of the unit upside down.
7. Remove the coin cell battery from its holder on the CPU board.
8. Insert a new CR1632 or equivalent coin cell.
9. Carefully replace the top of the unit back onto the base, making sure the edge connector of
the Interface board attached to the bottom of the unit is properly inserted into its socket on
the board stack inside the top.
10. Replace the screws in the 4 corners of the top.

5.4 Replacing the Internal Main Battery

2
The SMx can include a 12-volt internal battery for maintaining power for short periods
of time when main power is lost. The battery should be replaced every 5 years or if it
cannot maintain power when external power is removed.
1. Hold the magnet over the REF TEK triangle until the LCD indicates the unit is shutting down.
2. Wait until the LCD screen goes blank and the power LED turns off.
3. Disconnect all cables.
4. Remove the screws from each corner of the top of the unit.
5. Pull the cover off the unit. This will disconnect the internal interface board from the rest of
the board stack.
6. Disconnect the battery cables.
7. Open the Velcro holder and remove the battery.
8. Install a new CA1212 or equivalent battery and secure with the Velcro holder.
9. Reattach the battery leads, taking care to connect the red lead to the positive terminal and
the black lead to the negative terminal.
10. Carefully replace the top of the unit back onto the base, making sure the edge connector of
the Interface board attached to the bottom of the unit is properly inserted into its socket on
the board stack inside the top.
11. Replace the screws in the 4 corners of the top.
Reftek Systems Inc.
180-SMx2 Users Guide
180-SMx2-UG
11/29/2022
18