General Information; Foreword; Intended Use - ConMed Hyfrecator 2000 Service Manual

1.0 GENERAL INFORMATION

1.1 Foreword

This Service Manual has been prepared to guide the qualified biomedical electronics technician through all
aspects of preventative maintenance and repairs necessary to keep the Hyfrecator® 2000 Electrosurgical Unit
(ESU) up to original factory specifications.
CONMED Corporation reserves the right to alter the specifications of the Hyfrecator® 2000. It is
important to have access to the Operator's Manual supplied with each unit in order to restore original
specifications. The Operator's Manual may also lead to a better understanding the unit's unique features and
what the user may expect from it. The current version of the Hyfrecator® 2000 Operator's Manual may be
ordered from CONMED, as indicated on the inside front cover of this manual.
Although this ESU has been designed for many years of trouble-free use and features a number of designed-
in aids to simplify maintenance, it is assumed that the technician servicing the Hyfrecator® 2000 has a
basic understanding of digital, analog and high-frequency power electronics, including through-hole printed
wiring board (PWB) component replacement methods, and is familiar with troubleshooting using an
oscilloscope and digital voltmeter. Further, the technician should be able to perform standard biomedical
safety testing, such as measuring low-frequency leakage current.
The service technician should have ordinary electronic service tools and test equipment at his disposal. In
addition, nearly all service actions include verification of RF output power calibration using an
electrosurgical tester, or equivalent bench setup, capable of presenting 200, 500 and 1000 ohm non-reactive
loads and able to measure RMS RF currents from 40 to 400 mA with a traceable accuracy of at least 5%.
Although not essential, a high voltage, high frequency oscilloscope probe, such as the Tektronix P6015A can
be a useful troubleshooting tool.
A properly equipped bench should also have a functioning Hyfrecator® 2000 handswitched accessory on
hand to facilitate normal testing and service. This accessory may be ordered through CONMED Customer
Service.
The Hyfrecator® 2000 has been certified for conformance to:
• Underwriters Laboratories UL544
• Canadian Standards Association CSA 22.2 #125
• IEC 60601-1

1.2 Intended Use

The Hyfrecator® 2000 ESU is intended for use only by physicians for purposes of minor surgical treatments
where electrosurgical desiccation, coagulation or fulguration is indicated for hemostasis or tissue destruction.
It may also be used for excision of lesions where marginal thermal damage is not contraindicated.
As with all ESUs, these effects are achieved through passage of high-frequency current originating at the
active electrode through the patient's tissue. This current is in the 500 kHz range to prevent neuromuscular
stimulation. Current injected into the patient may be returned to the ESU via several possible paths:
• In monopolar applications, where a single-pole active electrode is used at the surgical site, current may
be returned either through a large-area return electrode in contact with the patient's skin, or simply
through the patient's body capacitance to earth. The current is then returned through the green-yellow
earth conductor in the unit's mains power cord. The return electrode jack is capacitively referenced to
earth.
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