U/S Driver 347888 - OPTIKON ASSISTANT Service Manual

Assistant
OPTIKON 2000

7.3 U/S DRIVER 347888

Check of reference voltages
-Connect multimeter between TP6 and TP3 (GNDs)
(2.42÷2.58) Vdc
-Connect multimeter between TP7 and TP3 (GNDs)
(3.85÷4.15) Vdc
-Connect multimeter between TP5 and TP3 (GNDs)
10 (9.59÷10.49) Vdc
U/S adjustable power supply check
Connect an Ultrasonic handpiece and tune it by depressing the footswitch
beyond position #3, while keeping the tip in water.
1. Set MODE to SURGEON , connect an oscilloscope between TP8 and
TP9 (GNDs) and preset U/S power to 100%.
2. Slowly depress the footswitch from position three to full travel, notice
that the voltage shown by the oscilloscope increases regularly from 0V
up.
Calibrations
The only calibration required by the 347888 is the adjustment of the
frequency range for tuning.
For this calibration, connect a frequency meter to the TP4 test point (Fout
signal) (GNDs) and operate as follows:
•
for calibration of minimum frequency, do not connect the handpiece to
the console (microprocessor sets the VCO to minimum), adjust R30
trimmer (identified by "fmin" in the schematic diagram) in order to have
Fout=37,500 KHz;
•
for calibration of maximum frequency, connect the handpiece to the
console, do not prime handpiece (microprocessor sets VCO to
maximum frequency), adjust R28 trimmer (identified by "fmax") in order
to have Fout= 43 KHz.
Code 121008S 7-2
Service Manual
VREF 2.5
VREF 4
Vsupply VCO
Rev. D