5.3
Extended
Functional Test,
continued
Chapter 5 - Upper Level Diagnostics
continued
3.
Activate the instrument blade by pressing the foot switch pedal labeled VAR. Verify that the VAR LED
flashes and that the Generator Audio Annunciator beeps. Activate the instrument blade by pressing the
foot switch pedal labeled FULL. Verify that the FULL LED flashes and that the annunciator beeps.
If the LED does not light, the keyboard PCB is faulty. See section 6.3.7 and replace the keyboard.
If the annunciator does not beep, check the cabling leading from the generator PCB to the volume
control pot on the front panel. Also, check the cabling leading from the annunciator to the keyboard.
If the cabling appears intact, either the drive circuitry in the generator PCB or the keyboard PCB is faulty.
Sequentially replace these boards and re-test (see section 6.3.6 and 6.3.7).
If the problem persists, replace the annunciator.
If the LED and annunciator stay on continuously, the Generator is unable to resonate the blade. Since the
previous sections of this manual have already identified the typical causes of this failure (blade failure,
blade attachment torque, Hand Piece failure, broken cabling inside the generator) it is most likely that
the LC filter network in the generator PCB is faulty. See section 6.3.6 and replace the generator PCB.
4.
Activate the instrument blade by pressing the FULL pedal. Press the blade into wood, cardboard, or wax
and observe that the blade cuts. While holding the FULL pedal down, increase the pressure on the blade
until the blade is no longer able to resonate. This is indicated by a continuous tone and LED illumination.
While still holding the pedal down, remove the blade from the cutting material and verify that the blade
again starts to resonate. This is indicated by the normal LED flashing and a non-continuous tone. This
regaining of resonance is referred to as "lock recovery."
NOTE: A warm Hand Piece/instrument blade may not regain resonance. If this test fails, allow the Hand Piece
to cool for several minutes and cool the blade tip with water.
Since the previous sections of this manual have already identified the typical causes of failure to cut or
lock recover, it is most likely that the phase lock loop circuitry in the generator PCB is faulty. See section
6.3.6 and replace the generator PCB.
If a problem with the system is still unidentified after performing these four steps, proceed to the Detailed
Diagnosis section (Chapter 6) of the manual and test each module for the expected input and output.
Chapter 6 - Detailed Diagnostics
This section of the manual specifies the expected input and output of each module of the ULTRACISION System.
Previous sections of this manual will direct the service person to a specific module (sub-section) within this section.
Each sub-section specifies the testing procedure - including assembly/disassembly - and test equipment.
NOTE:
Directions such as left and right assume that the reader is facing the
operator's panel.
Warning:
High voltages and currents are used in the generator. Take electric
shock precautions.
Warning:
Ultrasonic energy can cause severe burns. Handle acoustic components
with care.
Caution:
Damage may be done to the generator if power is lost to the microprocessor PCB.
Whenever microprocessor PCB performance is in doubt, the high voltage power supply
should be disabled; refer to section 6.3.6 for instructions.
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