H134640 - SERVER 720 (133MHZ OR 166MHZ) TRAPS OR HANGS
 
 SYMPTOM:
 Only a very small number of systems will experience the exact
 symptoms described in this tip.  Read and understand the entire
 tip before taking any action.
 
 PC Server 720 systems with 133MHz or 166MHz processors may trap
 (Trap 002), hang, or experience a Non-maskable Interrupt (NMI).
 
 PROBLEM ISOLATION AIDS:
 - The system is a PC Server 720 (8642) with one or more of the
   following processors installed:
 
   FRU p/n   Option p/n  Description
 ----------------------------------------------------------------
   75H9686    94G6055    133MHz Option I   non-NetWare SMP
   75H9688    94G6056    133MHz Option II
   75H9690    94G6057    166MHz
   76H0610    94G6057    166MHz
   76H3545    94G6057    166MHz            (Current 166MHz FRU)
 
 Note: Option I card does NOT support NetWare SMP.
       Option II card supports all Network Operating Systems
       supported on the PC Server 720 using the device drivers
       from 720NOS.EXE which is available on the IBM BBS.
 
 FIX:
 Boot the diagnostic diskette version 1.11 or later and test
 the memory and processors.  Refer to RETAIN Record H084333 for
 processor testing information.
 
 Note: Versions 1.11 and later require BIOS level 09 or later for
       SIMM failure isolation.  Refer to RETAIN Record H131754.
 
 If the memory and processor tests complete without error, and
 replacing the memory card (FRU p/n71G0696) does not correct the
 trap/hang error, then inspect the processor card(s) as follows:
 
 1. Locate the three digit date code (###) on the bar code:
 
    Bar codes may have one of two formats:
 
 .-----------------------------.  .-----------------------------.
 |  |||||| ||| |||||||||||||||||  |  |||||| ||| |||||||||||||||||
 |                             |  |                             |
 |  xxxxxxxxxxxJ11??###xxx     |  |  Jxxx###xxx 06xxxxxxxx      |
 -------------------------------  -------------------------------
 
 2. Locate the cache chips at locations U6, U7, U8, and U9.
    Look for the IBM logo on the cache chips.
 3. If the date code (###) is 966 thru 985 AND the cache chips
    have the IBM logo, then replace the processor card.
 
 If Motorola and Micron Technology cache chips are located, or
 the Server is not experiencing these exact symptoms, then there
 is no reason to replace the processor card.  Continue normal
 problem determination procedures to isolate the failing
 application or FRU.
 
 Only 15 - 30 processor cards manufactured between June 1 through
 June 30, 1996 may have the suspect IBM cache chips.
 
 October 22, 1996