Söring Arco-3000 - Description of Handpiece Recognition; Properties; Function

25/08/2004 © Söring Service-Manual Arco- and RF-units
1
not valid for A-3000/ -2000
2
not valid for Arco-2000
-46-
3
not valid for MBC600
4
not valid for Arco-1000
9. Description of handpiece recognition
Purpose of HSE04 is to recognize the different connected handpieces and bipolar
tweezers, to recognize activation of a push-button (finger switch, foot switch)with
galvanic isolation and to transfer the corresponding signals to the CPU.
9.1. Properties
-Supply:
± 15V, GNDA, +5V, GND
-Output signals: -I
2
C-bus (A/D-converter)
-4 bit (4 step window discriminator)
-Connections: -1 coded tweezers
-2 foot switches
-2 coded handpieces
or 1 coded handpiece (equipment version 2)
Equipment version 2*: A coded handpiece for a different application can be
recognized by additional wiring.
9.2. Function
An oscillator generates a narrow pulsed AC-interrogation signal with a frequency of
approx. 22 kHz and approx. 16Vss. The following final stage amplifies this signal and
feeds the primary of a transformer from the transformer array (Transformers 1 to 7).
Transformer 1, 2 Handpiece 1 / connector J1 resp. J5*
Transformer 3, 4 Handpiece 2 / connector J2 resp. J5*
Transformer 1, 2, 3 Recognition for other applications
Transformer 5 Bipolar tweezers / connector J3
Transformer 6 Foot switch 1 / connector J8 and J9
Transformer 7 Foot switch 2 / connector J8 and J9
For an interrogation the CPU switches by means of a decoder and a switch array the
primary of a transformer from the transformer array to the final stage of the oscillator. By
the coding of the handpiece (respectively by pressing the finger switch of a handpiece)
which is connected to the secondary of the selected transformer, a characteristic
recognition signal is generated at the primary. This signal is rectified and fed to the level
adaptation circuit (0V to 4V).
The adapted recognition signal switches the output level of the comparator in the
following window discriminator and is transformed into digital form by an A/D-converter
(I
2
C chip). Now these signals can be evaluated by the CPU.
The foot switch interrogation is performed in the same way as for the finger switches.