Models 870 and 890 - L3 modules - remove the protective cover
Models 870 and 890 - MCM and pass-through modules - remove the protective cover
Models 870 and 890 - Remove and replace tools
Models 870 and 890 - Shorts test qualified service meters and fail criteria
Models 870 and 890 - Testing MCMs and L3 modules for a short circuit
Models 870 and 890 - Install the MCM/L3/passthrough tri-fold plug map: For use by authorized
service providers.
Use this procedure to install the MCM/L3/passthrough tri-fold plug map.
If the MCM/L3/passthrough tri-fold plug map is not installed in the system, install it before continuing with
any repair action for MCM or L3 cache modules. The tri-fold plug map is included in the system tool kit.
Remove it from the tool kit and place it in the system rack by following the procedure below.
1. With the front cover open, locate the right frame extender (located on the opposite side of the UEPO
switch). The 50 mm (about 2 inches) wide label should be installed vertically, along the extender,
approximately in line with the EIA frame positions 22-28.
2. The tri-fold label has two velcro strips attached to the back. Remove the adhesive backing from the
velcro and stick it on the frame extender as described above. A small piece of velcro is used to help
keep it folded while attached to the frame. Refer to the following information on the placement of this
map.
Models
870 and 890 - L3 modules - remove the protective cover: For use by authorized service
providers.
Use this procedure to remove the L3 cover on the Models 870 and 890.
To remove the L3 cover:
Attention: Follow these procedures for proper cover removal.
1. Hold the module with one hand by placing your thumb on one side and fingers on the opposite.
Figure 1. Holding the L3 module for removal
Analyze hardware problems 115
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