Valleylab CUSA EXcel-8 - Page 8

K
23 kHz 5-13
36 kHz 5-14
Section 6. Principles of Operation
How the Handpiece Works 6-2
Electromechanical Operation 6-2
Fragmentation 6-3
Cooling 6-3
How the TISSUE Select Feature Works 5-4
Inherent Tissue Selectivity 6-5
increasing Tissue Selectivity 6-5
TISSUE Select Reduces Reserve Power tothe Tip 6-6
Benefits of TISSUE Select 6-8
A Common Misunderstanding of the Amplitude Setting 6-9
Section 7. Circuit Theory
For Your Information 741
Display Board 7-2
General Description 7-2
Fundamentals of Operation 72
Detailed Circuit Description 7-3
Machine Control Board 7-4
Introduction 7-4
Irrigation Pump 7-4
Suction Pump 7-5
Cooling Pump 7-6
Suction Valve 7-6
Amplitude Control 7-6
Valve Controls. 7-7
Power Control Input and Output Signals 7-7
Valtage Regulators 7-8
interface Connectors 7-8
Ultrasonics Board-Ultrasonic Generator 7-8
Fundamentals of Operation 7-8
The Main Frequency Loop 7-9
Bandpass Filter (BPF) 7-9
AGC/Error Amplifier Circuit 7-19
Phase Compensator 7-11
Driver Stage 7-11
Feedback Signal 7-12
Bias Circuitry 7-12
Frequency Selection Circuitry 7-12
Ultrasonics Board-Other Circuits 7-13
viii CUSA EXcel-8 System Service Manual