Models 870 And 890 - Memory Books And Memory Blanks; Models 870 And 890 - Motor Scroll Assembly (Msa) Air Filters - IBM iSeries 270 Service Manual

3. Find the location of the MDA to be replaced in Locations - Models 870 and 890.
4. Note the state of the MDA's LED. Then, press the (green) Start Service button on the UEPO panel.
5. Proceed only if the MDA LED is off, or the repair has been scheduled (System outage - EPO off).
6. Loosen the thumb screws on the MDA, and unplug the MDA from the face of the MSA.
Note: The MDA weighs approximately 0.45 Kg (one pound).
To replace the MDA:
1. Plug the MDA onto the face of the MSA, aligning the two metal lips on the face of the MSA with the
slots in the MDA. Push gently to seat the blind mate connector.
2. Tighten the thumb screws on the MDA.
3. Plug all cables to the MDA, ensuring correspondence of plug locations and cable labeling.
4. To indicate completion of these steps, press the (white) Service Complete button on the UEPO panel.
This ends the procedure.

Models 870 and 890 - Memory books and memory blanks

For use by authorized service providers.
Use this procedure to remove or replace the memory books and memory blanks on the Models 870 and
890.
To remove or replace memory books and memory blanks:
1. Power off the system. See Power on/off the system and logical partitions.
2. Open the front cover. See Models 870 and 890 - Covers.
3. Unscrew the thumb screws on the top and bottom of the lock bar, in front of the memory book to be
removed.
4. Grasp the release latches located at the top and bottom of the memory book between your thumb and
index finger, press the tabs together. Pivot the tabs and pull the book straight back.
5. Reverse this procedure to install the memory books and memory blanks.
This ends the procedure.

Models 870 and 890 - Motor scroll assembly (MSA) air filters

For use by authorized service providers.
Use this procedure to remove or replace the Motor scroll assembly (MSA) air filters on the Models 870
and 890.
The cage air filters are located in two slots on the front of the CEC cage, beside the air moving devices
(AMDs), one above the other. See Figure 1. in Locations — Models 870 and 890 for details.
Attention: The filters (P/N 11P3781) must be inspected every six months and replaced as necessary to
maintain proper air flow. Filters must be replaced if dirty - do not clean filters. It is not necessary to
remove power to the system or blower assemblies to replace the air filters.
To remove or replace the MSA air filters:
1. Do not power down the system if it is powered on. This procedure can be performed concurrently.
2. Open the cover to access the FRU. See Models 870 and 890 - Covers.
3. Grasp the finger tabs on the filter being serviced, and pull it straight out. The top filter is for MSA X4
(location H4), the bottom filter is for MSA X3 (location H3).
4. To replace the air filters, slide the air filter into the slot. The filter is keyed to ensure correct orientation.
This ends the procedure.
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Hardware (Remove and Replace; Part Locations and Listings)