ASP STERRAD 100, Service Manual, Page: 134 / 309

4. Connect a DVM between the ground (terminal #1) closest to the
connector distribution board edge, and the +5 V, terminal #2. On
Block 2 devices connect the DVM between the ground (pin #8 at the
top of J121) and pin #5.
5. Adjust the 5 V power supply to 5.2 volts symbol 177 \f “Symbol” \s
10±0.02 volts with the voltage adjustment trim pot located on the
lower center of the 5 V power supply board. On Block 2 devices the
trim pot is located on the lower right of the 5 V power supply. Close
the enclosure or proceed to the Analog-to-Digital Set
PointAnalog_To_Digital_Set_Point calibration.
Analog To Digital (Set Point)
CAUTION: Some Block 1.8 systems have Block 2 style PWAs.
Be sure to use the correct leads to avoid shorting
out the power supply.
1. Remove the system panels. Open the control enclosure and interrupt
power to the enclosure by using the safety interlock.
2. This step is for 1.8 systems without an upgraded board. Remove the
analog to digital (A/D) board, and install a 40 pin IC test clip on IC-8.
Install an extender board in the A/D board slot and plug the A/D
board into the extender. Apply power to the enclosure by enabling
the safety interlock, and allow 15 minutes for the system to stabilize.
3. Measure the voltage between IC-8 pin 39, and IC-8 pin 36. Adjust
trim pot R1 on the A/D board for 2.048 VDC
±
0.005 VDC. Apply a
small amount of Glyptal to the trim pot to lock adjustment.
4. For Block 2 devices (and updated 1.8 systems), measure the voltage
between test point 1 (+) and test point 2 (-). Adjust trim pot R1 on
the A/D board for 2.048 VDC ±0.005 VDC (counterclockwise to
increase, clockwise to decrease). Apply a small amount of Glyptal to
the trim pot to lock adjustment.
5. Interrupt power using the safety interlock, remove the extender
board, remove the IC test clip, and reinstall the A/D board in the
control enclosure. Apply power to the enclosure by enabling the
safety interlock. Close the enclosure unless you are testing the
high/low pressure range divider voltage.
4
Note: Adjustment to the A/D set point may affect the chamber
and door temperature calibrations. Verify the
temperature settings after adjusting the A/D set point.
The A/D set point should be verified after any power
supply voltage adjustment, or power supply replacement.
Controller Calibration User Interface and Control Subsystems
ASP Service Guide rev D. STERRAD® 100 Sterilizer 6-21