IBM pSeries 670, Service Manual

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Returning L3 Modules: The following procedure provides handling instructions for L3 modules to be
packaged and returned to the plant of manufacture.
1. If you are replacing an L3 module, use the packaging from the new module to return the old module. If
the packaging is not available or does not include all the parts described below, order the following
part for L3 module protective packaging:
v
1 L3 protective package part number 7335692, which includes: 1 carton, 1 top foam cushion, 1
bottom foam cushion with 4 cavities, 1 ESD bag, 1 desiccant)
2. Place bottom foam cushion, wrapped with ESD Bag, inside the corrugated carton. Leaving the ESD
bag open, place the L3 module with the cover into the bottom cushion, heatsink down. This will fit
snugly into the cavity of the foam.
3. Add the desiccant and seal the ESD bag with tape. The desiccant is optional for returned parts.
4. Place the top foam cushion over the assembly inside the carton.
5. Seal the carton and ship.
Replacement or New Installation
1. Go to “Methods for Testing L3 Cache Modules for a Short Circuit” on page 824 and install the
MCM/L3 module short-circuit test tool. Use the test tool during the L3 cache module replacement
procedure to ensure that the L3 cache modules are installed without a short circuit. If you install an
L3 cache module and encounter a short circuit, the L3 cache you installed must be replaced.
2. If installing a new L3 cache module, perform a general cleaning operation, using a sash brush, part
number 450732 ( not the one included with the FRU kit) and vacuum cleaner to remove any
accumulated dust and debris that has settled in the processor subsystem. Hold the vacuum hose
near the brush to remove any debris the brush generates, then remove the L3 filler from the site
where the new L3 cache module is to be located.
3. Loosen the captive thumbscrews on the protective cover, and remove the cover from the new L3
cache module as shown in the following illustration.
4. Align the flat corner on the L3 cache module to match the outline on the system backplane. Carefully
slide the L3 cache module straight onto the posts until it meets the system backplane.
5. If you are installing a new L3 cache module, replace the sleeves that you removed earlier with the
new sleeves provided with the L3 cache module kit. If you are reseating an existing module, use a
lint-free cloth to wipe any dust from the sleeves that you removed earlier.
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pSeries 670 Service Guide