Utah Medical Products Finesse ESU-110, Service Manual

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Waveform Verification
Set and verify the following output waveforms with an isolated oscil-
loscope, into open circuit conditions
Pass Corrected Frequency ________kHz (400-500)
Pass Corrected "CUT" continuous 450 kHz sinusoid
Pass Corrected "BLEND 1" 10 cycles on 6 cycles off
Pass Corrected "BLEND 2" 8 cycles on 8 cycles off
Pass Corrected "BLEND 3" 6 cycles on 10 cycles off
Pass Corrected "COAG" 1 cycle on and 15 cycles off
Output Calibration
Check system output power at the following displayed settings. All
measurements should be made through a 500
Ω
load. Tolerances are
listed in parentheses, and trimpot for adjustment in square brackets.
Do not activate system for more than 5 seconds for each reading,
and allow at least 15 seconds between readings.
Pass Corrected Cut [R142]
30: _____ 60: _____ 90: _____
(25-35W) (51-69W) (77-103W)
Pass Corrected Blend 1 [R144]
30: _____ 60: _____ 90: _____
(25-35W) (51-69W) (77-103W)
Pass Corrected Blend 2 [R146]
30: _____ 60: _____ 90: _____
(25-35W) (51-69W) (77-103W)
Pass Corrected Blend 3 [R148]
30: _____ 60: _____ 90: _____
(25-35W) (51-69W) (77-103W)
Pass Corrected Coag [R150]
30: _____ 60: _____ 75: _____
(25-35W) (51-69W) (64-86W)
RF Leakage Currents
Set cut display to “99” and coag display to “75”. Disconnect disper-
sive lead from analyzer and connect the Finesse system chassis
ground (equipotential connector on rear panel) to the dispersive
input on the analyzer. Check RF output through 200
Ω
load:
Pass Corrected Cut _____ (<4W)
Pass Corrected Blend 1 _____ (<4W)
Pass Corrected Blend 2 _____ (<4W)
Pass Corrected Blend 3 _____ (<4W)
Pass Corrected Coag _____ (<4W)
Chassis Leakage Currents
Using an electrical safety analyzer, measure the following conditions.
Acceptable conditions are listed in parentheses:
Ground lead intact
Pass Corrected Normal Polarity ______ (<100
μ
A)
Pass Corrected Reverse Polarity ______ (<100
μ
A)
Ground lead open
Pass Corrected Normal Polarity ______ (<100
μ
A)
Pass Corrected Reverse Polarity ______ (<100
μ
A)
Alarm Checks
Pass Corrected Pressing both cut and coag switchpen buttons
simultaneously produces alarm and disables
output
Pass Corrected Pressing both cut and coag foot pedals (if
used) simultaneously produces alarm and dis-
ables output
Pass Corrected A 900 ohm resistor placed between dispersive
pad receptacle pins does not correct patient
alarm condition
Pass Corrected With jumper in place between U301 pins 1
and 16, activation of any output mode results
in a continuous alarm
Pass Corrected Activation of coag mode into open circuit
conditions does not produce output error
alarm
Pass Corrected Each mains lead connection, tested individu-
ally, withstands 1200 VAC relative to chassis
Pass Corrected Adjust volume control so that cut and coag
audible tones can be clearly heard over the
smoke evacuation motor set at the ‘high’ flow
rate position.
Finesse Service Manual
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