_ DEC-O-LOG for RA70X

_ DOL, RA70X-I002, REV B RA70 disk drives, Dec 91

PROBLEM: Due to stress relief of the positioner block, the heads
in the RA70 will become offset over time, causing E9 and E25 errors.
These errors will lead to customer data loss.

FIELD EFFECTIVITY: This FCO should be implemented on all RA70X disk drives
manufactured before October,1991. The drive's microcode is resident in a
28 pin, DIP-socketed "UV_ROM" in socket E4 on the read-write module
(54-17775).  Note: This is the ONLY "IC" which has a plug-in socket on
either module making up the ECM Assy. The code revisions have these part
numbers:
 ECM at J6 P/N = 23-541E6-00 V79
 ECM >> J6 P/N = 23-587E6-00 V81
 ECM >> K8 P/N = 23-627E6-00 V82
 ECM >> L1 P/N = 23-637E6-00 V83
(Note, V80 was never released to the field) 
The new code (V83), is compatible will all revisions of the ECM module set.

QUICK CHECK: Use the command "SHOW DISK" to see the microcode revision.
If it is below V83, it should be replaced. You may also use LIFE to get
a listing of the drive and code revision.

The DEC on-site labor charge will be the time required to install and
test the FCO at the then current hourly rate.

FCO KIT ORDERING
EQ-01619-02 UV ROM
FA-04952-02 FCO Document