Assistant Service Manual
OPTIKON 2000
Code 121008S
6-6 Rev. D
the duty cycle the higher will be the pump speed. The square wave is
applied to U19 optocoupler that replicates the same waveform at the input
of U18B (U19 allows to maintain electric separation between GNDs and
GNDp). U18B is a three pole low-pass filter, its output voltage is
proportional to the duty cycle at the input.
- A watch dog circuit to monitor the microprocessor activity. In case of
microprocessor failure, this watch dog disables outputs of U6 and U16 TTL
latches that control system outputs, putting the ASSISTANT in a safe
state.
- A serial DAC (MAX5250) that generates the dc voltages to control the
pressure preset of the air injection tamponade system and the preset of
Ultrasound power.
- The interface to the U/S and Diathermy driver board.
The lines to control the 347888 are (J1):
1. Tuning request (J1-7, active high)
2. Phaco on (J1-6, active low)
3. Pulsed mode and pulses frequency (J1-4)
4. ERR0 and ERR1 error lines (J1-3 and 5). These lines are both high if
the handpiece is ready to operate, 0-0 means no handpiece connected,
0-1 Please tune, 1-0 tuning failed, Check tip.
5. Diathermy on (J1-8)
6. Power level setting for phaco or diathermy (J1-1 and 2).
Trough the J10 connector, the Control board monitors the correctness
of the activity of the U/S and Diathermy driver board (Ultrasound and
diathermy emission) and can stop the power emission in case of fault.
4. Sheet 5/5 contains the electronics for control of the proportional valve
and the trimmers for its calibration.
6.3 GRAPHIC USER INTERFACE
Display of parameters and data input is performed by a Graphic User
Interface. This device connects with the 393200 Control Board through a
RS232 three wires serial interface.
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