OVERVIEW
A limited number of Macintosh II CPUs were manufactured with an HMMU-unique
socket that does not allow the CPU to function properly if a PMMU upgrade is
installed.  Customers who install a Finished Goods PMMU Upgrade Kit in a
Macintosh II with an HMMU-unique socket are entitled to a Macintosh II Logic
Board exchange at no cost.
 
HOW TO IDENTIFY AN HMMU SOCKET
To identify whether the system contains an HMMU-unique socket, look at the
underside of the Macintosh II Logic Board.  (Refer to your Module
Identification manual for the location of the HMMU/PMMU on the Macintosh II
Logic Board.)
 
* HMMU sockets, which accommodate HMMUs only, contain 70 gold contacts soldered
  through the board in a random pattern.
 
* HMMU/PMMU sockets, which accommodate either component, contain 132 gold
  contacts in a 13 by 13 pin pattern.
 
When a PMMU upgrade is installed in a Macintosh II CPU containing an
HMMU-unique socket, many pins do not connect and the system will not boot.
 
REPAIR EXTENSION AUTHORIZATION
To obtain Labor, Parts Credit, and Parts Margin reimbursement,* return the
Macintosh II Logic Board to Apple and record the part number on the SRO form.
In addition, record the repair extension authorization code "OMR2560" in the
Warranty Information section of the SRO.
 
If a logic board with an HMMU-unique socket is covered by AppleCare and meets
the criteria for this program, list the exchange transaction under the Repair
Extension Program on the SRO, not under AppleCare.