IBM 270, Service Manual

Page: 114 / 622

11. Record on the log sheet on the system the date that this L3 has been removed.
To return 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: One L3 protective package (PN 7335692) which includes:
v
One carton
v One top foam cushion
v
One bottom foam cushion with four cavities
v
One ESD bag
v
One desiccant
2. Place the 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, heat sink 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.
To install L3 modules:
1. Go to the Testing L3 cache modules for a short circuit (See page 128) page and install the 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 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 is to
be located.
3. Follow the procedure described in the Attention note below to clean the LGA site using the brush
supplied with the new module.
Note: Before you remove the brush from its protective bag, loosen the bristles by pressing them on
the ESD mat until they are 90 degrees from the handle.
102
Hardware (Remove and Replace; Part Locations and Listings)