4120 NPU CPU Replacement
Installation Instructions
2000, Simplex Time Recorder Co., Westminster, MA 01441-0001 USA
All specifications and other information shown were current as of publication, and are subject to change without notice.
579-227
Rev. A
This publication describes the replacement procedure for the CPU card in the 4120 Network
Processing Unit (NPU).
Upon unpacking your Simplex product, inspect the contents of the carton for shipping damage. If
damage is apparent, immediately file a claim with the carrier and notify Simplex. Ship group
748-544 accompanies the product and contains the parts listed in the following table.
Part # Description Qty
636-995 New CPU Board 1
246-524 RAM Cards 2
734-038 New UL I/O Harness 1
734-037 New Hard Drive Harness 1
636-540 Hard Drive Kit 1
579-227 Installation Instructions 1
This publication discusses the following topics:
Topic Page #
Cautions and Warnings 2
Preparing System for Upgrade 3
Removing the Old CPU Board 5
Installing RAM in the New CPU Board 7
Connecting the New UL I/O Cable 8
Connecting the New CPU Board 9
Connecting the Hard Drive 11
Setting up the System for Reconfiguration 14
Configuring CMOS Setup 15
Upgrading from a 636-588 CPU Board 19
Introduction
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of Shipment
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