Scaled Instruments Davis Pro2 Parts list manual

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www.scaledinstruments.com
507 NW 60th Street Suite D Gainesville, FL, 32607 USA
Phone: [phone]
Email: [e-mail]
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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
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Introduction
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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.
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ToolsNeeded:
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 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
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Put the console in Setup Mode before performing the transmitter removal. Remove the
sensor suite from its fixed location and take it to a safe location to do your work such as a
workbench.
RemovingtheTransmitterBoardandBackforRepairorReplacement
1. Unlatch the rain cone from the senor suite by rotating it counter clockwise. A one inch
rotation should unlock the tabs from their seated position
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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.

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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

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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.

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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. With enough force the clip will pop out of place and the transmitter SIM will be free from
the sensor suite.

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RemovingtheSupercapacitor
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1. Nowthatthetransmitterisoutremovethefourscrewscircledinred:
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2. Removethewhitecoverandnotethesupercapacitorcircledinredwhichissubjectto
replacement:
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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:
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Oncethecompresswedgeisfreerotatetheantennaup

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Gentlyrotatetheboardfreefromtherearclamshell:
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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
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5. PhysicallyremovethesupercapacitorsuchthatitsexistingleadsremainintactinthePCBboard:
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InstallinganewSupercapacitor
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1. TintheLeadsontheboardwithasolderingironandsolder,whilenotingthepositiveand
negativeleadlocations:
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Takenoteofthepositiveandnegativeleadonthenewsupercapacitor:
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2. PutthenewsupercapacitoronthePCBboardaligningthe(+)and(‐)leadsaccordingly
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3. Solderthenewleadstotheoldleads
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4. ClipoffexcessLeads:
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