S83/85 Ultrasonic Generator Troubleshooting
A40-064 Rev 0 Page 78
over 400µA, repair or replace the faulty component. If the
meter does not indicate leakage, check capacitance of
transducers.
8 Shake an immersible to check immersible transducers for
debonding,. One or moreelement has debonded if the transducer
rattles
Warning: Transducer (elements) can hold a high voltage charge. Before
troubleshooting or making repairs, discharge voltage by momentarily
shorting pins A and B of the RF connector that plugs into the ultrasonic
power supply.
Note: 1. Take capacitance measurements at room temperature.
2. Capacitance values: 25 kHz = 0.0040 uF (±7%); 40 kHz = 0.0044 uF (±7%).
Step Action
8 Take capacitance measurements as follows:
1. Determine capacitance values in µF:
• 25 kHz – 0.0040 x # of transducers (±7%)
• 40 kHz – 0.0044 x # if transducers (±7%)
2. Use a capacitance meter to test each set of transducers.
3. If the capacitance meter displays a value varying by more
than 7% replace the set of transducers.
6.4 Resistance Charts
6.4.1 Overview
Doing point-to-point resistance checks can help isolate circuit defects which produce a significant
change in resistance readings. The following resistance charts list specific circuit points on the
modules, expected resistance values between these points, and steps to take if expected and actual
resistance measurements do not match.
Warning: Ultrasonic Power supplies produce high voltage. Before working on an
ultrasonic power supply, do the following: (1) turn off the ultrasonic
power supply and unplug AC voltage; and (2) remove the cover and
allow at least 1 minute for capacitors to discharge.
6.4.2 Using Resistance Charts
To use the resistance charts:
1. Set your ohmmeter to diode test.
2. Measure the diode resistance at the circuit test points listed in columns 1 and 2. (Refer to
Figure 6-1, which contain drawings showing the test points.)
3. Compare resistance values on your ohmmeter with the resistance values listed in Column 3.
4. If the two values differ, the driver board assembly is bad. Check the assembly part number
before calling for replacements.
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