Schlage HandPunch GT-400 Instruction Manual

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 1
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Graphic guide to the replacement of the lithium battery in the GT-400
Tools needed
ESD Grounding Strap worn at all times
Antistatic mat clear of debris to protect the terminal from scratches
#2 Philips Screwdriver for the disassembly of theGT-400
Small flat Jeweler’s type screwdriver
Torque screwdriver must be used for the reassembly of the GT-400 set to 10.0 in-lbs

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 2
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Removal of the back plate
Lay the GT-400 terminal face down of a clean antistatic mat to protect the surface from scratches and the
PCBs from ESD damage. Remove the two screws highlighted and set aside for reuse.

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 3
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Removal of the IO board
With the terminal still laying face down and while wearing the ESD ground strap hold the IO board by the
edges and gently pull the board towards you and set aside.

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 4
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Removal of the Power board
Remove the two screws highlighted and set aside for reuse. Hold the power board by the edges and gently pull
the board towards you and set aside.

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 5
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Removal of the back plate
Remove the two screws highlighted and set aside for reuse. Rotate the top of the back plate towards
you

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 6
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Remove the tamper switch connector from the main board. Do not pull by the wires but depress the tab to
release the connector.

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 7
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Removal of the lithium battery
Carefully place the terminal on its top panel so that you are looking at the main board. The lithium battery is
located above the SD Card.
1. Place a finger on top of the lithium battery so that it will not pop out and fall forward, into the top
panel, when the battery is released. If that happens, the reader will need to be taken completely apart
to retrieve the battery.
2. Take a small jeweler’s size flat screwdriver and gently release the battery up on the right hand side of
the battery holder.
1
2

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 8
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Installation of the lithium battery
There are two types of battery holder that may be installed on the main board; one with visible spring keeps
and one without. The installation of the battery is the same either way.
Place the left side of the battery into the battery holder first and snap the battery into place.
Spring

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 9
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Routing the battery cable if there is a back up battery installed
Make sure that the battery cable is routed around the camera compartment as shown in the image above. The
area highlighted in yellow needs special attention when installin the back plate, the wires here can be easily
pinched.

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 10
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Connecting the tamper switch
Reconnect the tamper switch cable.

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 11
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Reinstalling the back plate
Start with setting the back plate into the battery compartment and start rotating the back plate towards the
top. If there is a backup battery installed, make sure that the BB-300 cable is not getting pinched in the lower
right hand cable. Stop when you get to the camera cable.
Pull the backup battery cable through the back plate as shown above.

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 12
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Installing back plate screws
This point forward use the torque screwdriver set to 10.0 in-lbs
Before screwing down the back plate make sure that neither the BB-300 cable nor the white camera
cable will be pinched.
Install these screws into the two the back plate inserts. Do not use the longer self tapping screws used for the
power board or they will break through the front of the reader.

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 13
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Reinstalling the power board
Making sure your ground strap is on. Align the 2 x 25 pin connector and header and gently mate the two
boards.

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 14
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Secure the power board to the unit using the two screws shown in the image below.

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 15
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Reinstalling the IO board
Align the IO’s 2 x 25 pin header and connector and gently press them together making sure that it is installed.
Secure the IO board to the unit with the screws shown in the image below.

GT-400 Lithium Battery Replacement TECHNICAL NOTE
Rev. A 16
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Plugging in the battery backup cable if installed
Replacement complete