SECTION IV
MAINTENANCE / SERVICE
NOTE
Turning the adjusting screw of the pressure range
potentiometer in the clockwise direction raises the
sterilizer pressure reading while turning the adjusting
screw in the counter-clockwise direction lowers the
sterilizer pressure reading.
(12) Turn the adjusting screw of the pressure range
potentiometer (2, Figure 4-28) in the clockwise
or counter-clockwise direction until the reading
on the PRESSURE (PSI) display matches the
reading of the Pressure Gauge Test Harness
within a tolerance of ±0.5 psi (3.5 kPa).
(13) Recheck the multimeter reading. It should still
read 2.550 VDC ±0.001 VDC.
(14) Press the STOP button to end the test/calibra-
tion cycle and allow the sterilizer to vent and
open its door (See Figure 4-27).
(15) Disconnect the leads of the multimeter from
Test Points (A and B, Figure 4-28).
(16) Disconnect the power cord from the sterilizer
and then repeat steps 3 and 4 of this procedure.
The reading should read 0.1 psi (1 kPa) with the
sterilizer door open. If not, repeat steps 5 and 6
of this procedure.
(17) Disconnect the power cord from sterilizer.
(18) Disconnect Pressure Gauge Test Harness from
sterilizer (See Figure 4-29).
(19) Install right hand side panel.
© Midmark Corporation 2002 SF-1827 Page 4-21 Printed in U.S.A.
(5) Turn adjusting screw of pressure zero potenti-
ometer (1, Figure 4-28) in the counter-clockwise
direction until the PRESSURE (PSI) display
reads 0.0 psi (0.0 kPa).
(6) Turn adjusting screw of pressure zero potenti-
ometer (1) in the clockwise direction until the
PRESSURE (PSI) display reads 0.1 psi (1 kPa).
CAUTION
The multimeter leads must be connected
exactly as shown in the illustration.
Connecting a lead to the wrong side of the resistor or
wrong pin of the chip will result in an incorrect
adjustment.
(7) Set the multimeter to read VDC at least the 5
Volts range. Connect the red lead of a multim-
eter to Test Point (A) and the black lead of a
multimeter to Test Point (B).
NOTE
In the following step, if the digital multimeter being
used has only three digits, adjust to a reading of 2.54
VDC and then adjust and set to where the reading
just changes to 2.55 VDC.
(8) The multimeter should read 2.550 VDC ±0.001
VDC. If multimeter reading is not 2.550 VDC
±0.001 VDC, adjust the adjusting screw of the
temperature potentiometer (3) in a clockwise
direction to lower the voltage setting or a
counter-clockwise direction to raise the voltage
setting until the multimeter reading is 2.550
VDC ±0.001 VDC.
(9) Close the sterilizer door.
(10) Connect Pressure Gauge Test Harness to
sterilizer (See Figure 4-29) (Refer to the steril-
izer Service and Parts Manual for this special
tool).
(11) Press the START button to start a test/calibra-
tion cycle and wait until the temperature on the
TEMP (°F) / TIME (MIN: SECONDS) display
reaches 272 - 273°F (133-134°C) (See Figure 4-
27).
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