SES 2000 AUTOCLAVE Part 3
ST-SM8l Page 23 of 43
PART 3 MAINTENANCE
Replace varistor across mains terminals of solid
sate relay
Solid State Relay (Fig. 4 item 8A)
CE ONLY see note page 38.
3.16 Remove electrical connections from relay board
noting their attachment positions. Un-fasten four screws
to remove relay board from dividing panel. Un-fasten
four screws from behind the board to release the solid
state relay unit, together with its heat sink. Un-fasten
and remove the heat sink. When fitting a replacement
relay unit, coat the face which mates with the heat sink
with a thin layer of zinc oxide based heat transfer
compound, having first cleaned-off old compound if re-
using the original heat sink. Fit heat sink to new relay
unit, fit relay to board, and fit board to autoclave dividing
panel by reversing the disassembly procedure. Re-
connect electrical connections.
Mechanical Relay (Fig. 4 item 21)
CE ONLY see note page 38.
3.17 To remove mechanical relay unit cut the plastic
cable tie then unplug the relay unit from the relay board.
When fitting replacement relay unit, fit a new cable tie.
Heating Element (Fig. 4 item 1)
3.18 To replace heating element, proceed as follows:
a Remove electrical connections from heating
element terminals.
CAUTION
Avoid kinking the capillary tube.
b Remove sterilizing trays and tray carrier, and
remove element clamp from inside chamber,
together with heater thermostats sensor and clip.
c Unscrew and remove large nut from heater
mounting boss at rear of chamber.
d Extract heating element via chamber mouth.
e Fit replacement heating element by reversing
order of removal procedure.
Note
Ensure heating element is horizontal when fitted. Also
ensure that a new sealing washer is used and that the
nut is fully tightened, to avoid leaks.
Printer Interface Board (Fig. 4 item 20)
3.19 Remove the printer interface board as follows:
a Disconnect all electrical connections noting their
position and orientation for correct reconnection.
b Disconnect the voltage regulator from the partition
wall.
c Remove two screws securing the interface board
to the partition wall, and remove printer interface
board complete with voltage regulator unit.
d Refit printer interface board (complete with rectifier
unit) using the reverse removal procedure but
note that:
The voltage regulator/partition wall contact
surface must be smeared with zinc oxide
heat transfer compound, and the securing
screw is firmly tightened.
Note: If a new printer interface board is fitted, it must
be set-up as described in section 3.30.
Voltage Regulators (Fig. 8)
3.20 The voltage regulators form part of the controller
board and the printer interface board and must be
mounted so that they make good thermal contact with
the steel partition. The leads to the voltage regulator are
easily broken and if one should snap off at the body of
the unit, it can be replaced by a standard 7805 voltage
regulator. This avoids the need to change the entire
controller. In such a case some re-adjustment of the
calibration will be required.
Door Seal (Fig. 2 item 10)
3.21 Open chamber door and remove central aerotight
nut, stainless steel washer, retaining plate and door
seal. When fitting a new door seal, ensure the nut is
tight. Check O-ring behind seal spinning and replace if
necessary. Use a smear of silicone grease on the O-
ring.
Note: Do not allow silicone grease to come into contact
with the door seal (Fig. 2 item 10).
Pressure Gauge (Fig. 3 item 3)
3.22 Ensure chamber is at atmospheric pressure and
remove plumbing connection from rear of gauge.
Disconnect bracket from panel by removing two nuts,
spring washers and nylon spacers. Note that when
fitting gauge, the spacers must be replaced between
gauge and bracket. Gauge adjustment is possible by
rotating the adjusting screw at the rear of the gauge, but
this should only be carried out when the chamber is at
working pressure (2.2 bar) on the 134°C cycle.
CAUTION
When adjusting the pressure gauge, it is important
that the adjustment screw should not be rotated
more than a few degrees in either direction.
Permanent damage to the mechanism could result
if this caution is ignored.
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