Steris SYSTEM 1E, Maintenance Manual

Page: 59 / 179

5-7
764333-675
5.1.15 Power Failure
Description – Loss of power during cycle.
Action:
1. Check Customer incoming power – report problem
to Customer.
2. Faulty power supply – replace.
3. Check internal power connections as follows (refer
to Figures 5-4 and 5-7.):
a. Check all connections. Pay particular attention
to the 115V ac connections to the line filter,
115V ac wires out of the line filter to the
connection on the power supply, cable from the
power supply to the interface board, P1 and P2
on the interface board to P10 and P11 on the
control board. Remove the connections, plug
and unplug the connector a couple of times,
apply anti-fretting compound (P/N 764329907)
to the pins and sockets, then reconnect. If this
does not fix the power failure problem, continue
with the next step.
b. Check the 5V dc at the P10 connector between
pins 1 and 3. The voltage should be 4.9-5.1V dc
and steady. If the voltage is steady and the unit
is still having power failures, go to Step d. If
voltage is not correct, continue with next step.
c. If the voltage to the control falls below 4.8V dc,
the unit resets. This drop in voltage can be
caused by loose connections or a bad power
supply. To isolate the problem, check the unit
as follows:
1. Check the 5V dc at the P2 connector
between pins 1 and 4. If the voltage is
4.9 - 5.1V dc and steady at the P2 connector,
the dc power cable is loose or defective.
Check connections and replace, if
necessary. If voltage is not correct, continue
to next step.
2. Check 5V dc at the P1 connector between
pins 1 to 4, 2 to 5, and 3 to 6. All voltages
should be 4.9 - 5.1 V dc and steady. If they
are not correct, there is a loose or bad cable
from the power supply, or the power
supply is bad. Replace defective
component.
d. If the 5V dc voltages are correct, the problem
may be with the control board. To verify the
problem, power down the unit, and disconnect
cables P12, P5B and P8 from the control
assembly. Leave P10 and P11 connected. Power
up unit; if unit still goes into power failure, the
control board is defective and should be
replaced.
5.1 LIQUID CHEMICAL STERILIZATION CYCLE FAULTS (CONTINUED)