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507 NW 60th Street Suite D Gainesville, FL, 32607 USA
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Davis Pro2 Sensor Interface Module (SIM) Supercap Replacement
Table of Contents
Introduction .................................................................................................................................................. 1
Tools Needed: ............................................................................................................................................... 2
Performing the Removal: . ............................................................................................................................. 2
Decommissioning the Weather Station for Repair ................................................................................... 2
Removing the Transmitter Board and Back for Repair or Replacement .................................................. 2
Removing the Supercapacitor . .................................................................................................................. 7
Installing a new Supercapacitor . ............................................................................................................. 17
Conclusion . .................................................................................................................................................. 22
Introduction
The Pro2 Supercap is by far the most common failure of the Davis Pro2 Sensor Interface
Module (SIM). Failure is indicated by a relative rapid discharge of the on board CR123 battery
requiring frequent replacement. If your SIM is less than a year old please consult Davis or your
retail supplier for a warranty replacement.
NOTE:
The following procedure will void your 1-year warranty and is only recommended after
the expiration of the warranty period.
NOTE:
By no means do we claim that this is the "best" method for supercap replacement, but
we find this to be the easiest method and is probably best for people not experienced using a
soldering iron.
© 2014 Scaled Instruments - Reproduction prohibited unless permission explicitly granted
www.scaledinstruments.com
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Summary of Contents for Scaled Instruments Davis Pro2
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Page 1: Table Of Contents
Introduction The Pro2 Supercap is by far the most common failure of the Davis Pro2 Sensor Interface Module (SIM). Failure is indicated by a relative rapid discharge of the on board CR123 battery requiring frequent replacement. If your SIM is less than a year old please consult Davis or your retail supplier for a warranty replacement. -
Page 2: Tools Needed
2 Tools Needed: Small flat head screw driver Small exacto razor (best if it is dull. It is used as a wedge, not for cutting) Small Phillips head screw driver Soldering Iron Solder Performing the Removal: Decommissioning the Weather Station for Repair ... - Page 3 3 2. Lift and remove the rain cone out of the way and set it aside to expose the rain spoon mechanism. The rain cone is removed in order to have easier access to the transmitter back and clip. © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted ...
- Page 4 4 3. Remove the Sensor Interface Module (SIM) front housing cover and disconnect all the plugged-in jacks. 4. Route the jacks out the bottom left port © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
- Page 5 5 5. The rear view of SIM box below shows the clip that needs to be removed in order to free the SIM and back cover from the sensor suite 6. The clip will need to be forced up in the direction of the green arrows by manipulating pressure points at the location and direction of the red arrows below.
- Page 6 6 7. To do this, place the palms of your hands at the top pressure points and your fingers underneath the clip at the bottom pressure points as shown below. With GREAT force squeeze your fingers toward your thumbs and palms. 8.
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Page 7: Removing The Supercapacitor
7 Removing the Supercapacitor 1. Now that the transmitter is out remove the four screws circled in red: © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ... - Page 8 8 2. Remove the white cover and note the supercapacitor circled in red which is subject to replacement: © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
- Page 9 9 3. In order to access the supercapacitor it is best to remove the PCB board from the rear clam shell. The compression wedge must be removed using something similar to this technique: Once the compress wedge is free rotate the antenna up © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
- Page 10 10 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
- Page 11 11 Gently rotate the board free from the rear clam shell: © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
- Page 12 12 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
- Page 13 13 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
- Page 14 14 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
- Page 15 15 4. Discharge the existing supercapacitor in a safe manner (it is likely dead already if you are following this guide). Now remove it by clipping the leads as close to the body of the supercapacitor as possible © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
- Page 16 16 5. Physically remove the supercapacitor such that its existing leads remain intact in the PCB board: © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
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Page 17: Installing A New Supercapacitor
17 Installing a new Supercapacitor 1. Tin the Leads on the board with a soldering iron and solder, while noting the positive and negative lead locations: Take note of the positive and negative lead on the new supercapacitor: © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ... - Page 18 18 2. Put the new supercapacitor on the PCB board aligning the (+) and (‐) leads accordingly 3. Solder the new leads to the old leads © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
- Page 19 19 4. Clip off excess Leads: © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
- Page 20 20 © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
- Page 21 21 5. Install PCB board back into rear clam shell and insert the compression wedge: © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
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Page 22: Conclusion
22 6. Install the white cover and install the unit back into weather station insert a fresh CR123 battery and remove your console from setup mode to resume nominal operation Conclusion We recommend leaving the original leads in place and cutting the original factory installed supercapacitor leads at the body of the barrel as demonstrated above. Someone not experienced in soldering on the PCB board will typically damage the soldering pads and thus rendering the board inoperable. By simply leaving the original leads in place and soldering the new supercapacitor leads to the old leads, many generations of supercapacitors may be removed and installed without worry of damaging the PCB board. © 2014 Scaled Instruments – Reproduction prohibited unless permission explicitly granted www.scaledinstruments.com ...
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