Söring Arco-3000 - Description of Board HFO_B; Design;Function of Board HFO_B

25/08/2004 © Söring Service-Manual Arco- and RF-units
1
not valid for A-3000/ -2000
2
not valid for Arco-2000
-39-
3
not valid for MBC600
4
not valid for Arco-1000
capacitors C10 and C11 to the monopolar output transformer TR3. There are no more
capacitive connections to the patient electrode. The transformer TR5 is used for loop
impedance tests between the two halves of the patient electrode. This transformer as
well as the other output transformers are designed for the applicable RF-voltages.
Inserted into the RF-signal circuit are the two transformers TR1 and TR2. Transformer
TR1 is a current transformer and TR2 a voltage transformer. With the corresponding
signals the output power delivered by the RF-modules is checked. The evaluation is
located on the piggy-back board (HFO_2). When controlling the relays by the relay driver
IC1, the transistors Q1 and T1 block the relays in case REL_EN\ is at logical 1. This is
the case, when the I
2
C-components have not yet been initialized after switching-on the
equipment.
7.3. Description of board HFO_B
The board HFO_B is mounted as a piggy-back board on board HFO_A. It contains all
necessary components for
-relay control
-RF-power measurement
-loop impedance measurement (PE-electrode,, monopolar/ bipolar)
-function test
-bus-interface (I
2
C)
7.3.1. Design/function of board HFO_B
The board contains the following units:
-Digital interfaces I
2
C-bus, IC1 and -2. IC1 controls the relays on the main board
(Signals REL1 to REL8)
-IC2 delivers the release signal for the relays and the control of the multiplexer for
testing the ADC and the test device for PE-contact recognition and tissue contact
recognition monopolar and bipolar (impedance measurements).
-Analog to digital converter: I
2
C-chip IC3 for power measurement, PE-contact
recognition and amplitude of test oscillator.
-Test device for checking all DAC´s, also those of CPU- and handpiece recognition
board HSE. (Multiplexer IC4 and IC5).
-Test oscillator with driver stage (U1, U5, T5 and T6)
-Reference processing (U2a)
-Monoploar/bipolar contact recognition (U7, IC5d and -e)
-PE-contact recognition (U6, U8c and -e) with testing device
-Power measurement, multiplier U11, U12, measuring amplifier U10 and low-pass
U2