Conmed Hyfrecator 2000 Preventive Maintenance

There are several kinds of maintenances for Conmed Hyfrecator 2000. One of them is preventive maintenance, which is known as PM in short. What is the Conmed Hyfrecator 2000 preventive maintenance?

A preventive maintenance can be done easily if it is done by a trained and equipped biomedical electronics technician. If the product passes all the preventive maintenance tests, it can be returned to the service.

Physical Inspection and Cleaning

All the steps to do physical inspection and cleaning include:

1. After getting a Hyfrecator 2000, the first thing that you need to do is to review any documents that may be provided by the user for indications of possible malfunctions. If there is an unsatisfactory performance, it may need for than preventive maintenance checks. Please check also any accessories, cables or cords.
2. Write down the AC mains rating and serial number and notations of any alterations.
3. Check if there are any signs of physical damage, including dented or cracked plastic, misaligned connectorpins, loose parts inside or evidence of possible fluid penetration. Make sure that the power control knob is safe on the encoder shaft and that it does not rub on the front panel.
4. If everything seems fine, please clean it using a cloth orpaper towel dampened with mild soap and water.

DC Isolation Tests

DC Isolation tests is the kind of test that verifies that the patiengt output jacks are isolated at DC from earth and from one another. If the isolation fails, the patient will be at risk of electrical shock.

To perform the test, here is every step to follow:

1. Firstly, you should disconnect the power cord from the C inlet connector of the unit and any accessory that is connected to the handswitch connector.
2. Then, set the DC ohmmeter to the 20 megohm or higher range and then connect one lead to the P/P jack. Do not forget to verify that more than 20 megohms shows up between the P/P jack and some terminals.
3. After that, move the first lead from the P/P jack to either BI jack. Please do the same thing to opposite BI jack and any of the handswitch pins.

Functional Testing

Functional testing is the series of tests that verify that all of the displays and controls can work well and that all Power On Self Tests or POST will pass. Here are all the steps:

1. First of all, you have to connect the power cord and a handswitching accessory supplied by the user to the unit. If it is not available, use your own. Now, leave the accessory RF lead disconnected from the unit.
2. It is possible for the unit to be operated safely for prevention maintenance while resting on its rear panel.
3. Set the power switch of unit to FF and connect the power plug to a source of AC mains power equal to the nameplate rating of the unit.
4. Next, turn the power switch On and verify a POST and tone test.
5. Note the as delivered position and the stored power settings.
6. Choose LO mode and rotate the power control knob counterclockwise.
7. Rotate the power control know clockwise and do it slowly from the 0.0 setting to a minimum of one full revolution.
8. Press and release each power adjustment button a few times.
9. Press and release the handswitch activation button.
10. Make sure the power cord retention is sound and the handswitch connection locks and releases easily.
11. Turn the unit on its side and rotate the tone volume control over its full range.
12. After that, attach footswitch and test it.

Mains Frequency Leakage

Mains frequency leakage refers to the tests to make sure that the low frequency source current showing on the RF output jacks of the unit are safely within the requitements of IEC 60601-1 patient leakage. Take note that the monopolar circuits (HI and LO) and Type BF while Bipolar (BI) circuit is IEC Type CF.

RF Output Power Testing

RF output power testing is the kind of test to make sure that the Hyfrecator 2000 is able to deliver RF output as indicated on the power display with specified accuracy. The steps includes:

1. Connect the ESU tester Place or Return input and Active input to the Hyfrecator output jacks.
2. Then, set the tester and set the Hyfrecator to the indicated mode and power setting.
3. In the next step, activate the unit and allow the reading to settle for like 2 seconds.
4. After that, compare the reading to the limits shown.

RF Leakage Test

RF leakage test is the kind of test to make sure that the integrity of the RD earth referencing circuitry for HI and LO modes and proper RF isolation for the BI outputs. If there is a failure, there might be burns. Please do the test only after the unit has yielded satisfactory results from the preceding preventive maintenance tests.

To be able to do the test, the instructions to follow include:

1. Collect the resistors and RD ammeter listed in the Legend.
2. Afterward, connect the unit to an AC mains power source according to the nametag rating of the  unit.
3. Then, turn the unit on and set the controls for 35W HI.
4. The next thing that you have to do is to set the controls of the unit to 35W BI and connect the test setup.

Return to Service

If all the tests show a good result, you can put the unit back in service. Before doing it, do not forget to return the stored power settings and the mode selection to the earlier places. You can just simply adjust the power setting to the noted value in every mode and activate the unit. Then, cycle the power switch to verify a normal POST sequence and check the power settings in every mode again. Lastly, turn the power switch OFF and return the mode switch to the original selection.