Specifications

Checkout Procedures for
and 433s System Units
the Model 400s, 425s,
This section explains how to troubleshoot the power supply and calendar batte~
on Model 400s,42Ss,and 433ssystemunits.
Power Supply Verification for 400s, 425s, and 433s
System Units
Note the followin information about power supplyoperation before
you per-
#!
form the troubles ootoing steps
● The power supplydelivers dc voltagesto all boar~, internal massstorage
devices,and fans when you press the power-on swtch.
● If the power is not completelyconnected to the motherboard with a nor-
mal load and is turned off, then turned on, it maybe a minute or two be-
fore the voltagescome up to their normal values.
1.
2.
3.
NOTICE: Before u replace the power supply or a
related
%~y
U, ahva check the wer sup
E
Iyharness and ot er FRU cab es for loose,
roken, or pinched wires.
Start this rocedure with the system unit power off and the power cord
$
unplugge . Remove the top cover.
If connected, disconnect the system unit from the network. If the system
uses a network connector, unplug it from the network. If thes tern uses
BNC connectors to connect to the network, unplug the BNC I?’ from
thes tern unit connector leavingthe network intact through the arms of
the
~?”
connector.
Plu in the power cord and wer on the system. Measure the +5, -12
J ~ w through the holes in the
an +12 voltageaon the C U board test
top of the chassis,as shown in Figure 4-1. To measure the -5 and +9
V dcj open the power supplydrawer and measure it at the connector.
Troubleshooting 4-23