Erbe ICC 200, Service Manual

Page: 120 / 266

1 TEST PROGRAMS AND ADJUSTMENTS 120
/ 266
Adjustment of activation
and instrument detection
MIC board 30128-200
MIC socket AUTO COAG 2 APM P [Watt]
NE1 CUT
Effect 3
15 Watt
500 Ohm 15 ± 3 (W)
The output error display is activated at 40 W and 500 Ohms. Activation of the bipolar CUT function is also
possible without the neutral electrode.
• Test bipolar SOFT coagulation
The SOFT function is activated with the blue footswitch.
MIC socket AUTO COAG 2 APM P [Watt]
NE1 CUT SOFT 15 Watt
500 Ohm
No-load voltage 84 ± 5 V
p
7 ± 2 (W)
• Test the protective circuit with test program 18
In the event of an error, the protective circuit in the MIEN program prevents an overdose of HF
voltage and HF current. If the output current is too high, the fusible link in the protective circuit trips.
The test checks whether the correct fuse is inserted. The manufacturer of the fuse and the fuse rating
can be found in the parts list.
• Testing the voltage limitation with no load
Activate test program 18.
In the AUTO CUT display panel the set value of HF output voltage is displayed. With the CUT “Up/
Down” buttons, the HF output voltage can be adjusted in the range from 260Vp to 500 Vp (±50Vp).
Connect oscilloscope to the MIC output socket NE1 and CUT.
The highest HF peak voltage at the AUTO CUT Effect 3 (15 W) setting is 340 V
p
. At this voltage the
protective circuit must not yet impose any limitation.
The protective circuit limits the output voltage from 360 V
p
upward. Range in which the limitation
must be activated: 360–450 V
p
.
At the setting of 499 V
p
the fuse will not trip and the operability of the protective circuit remains
intact.
ATTENTION!
As soon as the voltage limitation is activated, current flows through the protective diodes and the diodes heat
up. The duration of the test from the moment of voltage limitation must not exceed 5 seconds or else the
protective diodes break down and the circuit will have to be repaired.