_ DEC-O-LOG for H7317

_ DOL, H7317-S001, Power Distribution System, MAY 90

PROBLEM: 1) Back-up Battery frequently not delivering power to the 
P4 PCB. The fuse located between the battery and the P4 PCB is
under-rated and is blowing.  Replacement of the fuse is mandatory.
2) Programming errors were found in the firmware on both the M3
Processor PCB (Version 2.52 and earlier) and M4 Main Processor PCB
(Version 2.3 and earlier).

FIELD EFFECTIVITY: All H7317 (PDS PLUS) manufactured prior to May 1989.
Includes variants -Ax, -Hx, -Cx, and -Lx.

QUICK CHECK: Problem #1: Examine small fuse located in-line between
the batter and P47 on the P4 Power Supply PCB. If the fuse is 2 amps
(3ag), it must be replaced.  If the fuse is 4 amps, this upgrade is
not necessary.  Problem #2: Examine the M4 Main Processor PCB 
located in the upper left position on the front door of the unit.
Look for the stamped revision letter next to the vendor part number
(112748).  The revision letter must be "J" or later.

FCO KIT ORDERING:
EQ-01572-02 Battery Fuse Kit
EQ-01572-04 Network/Firmware Kit
FA-04900-02 FCO Document