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Description of control unit MEL64/65 Service manual M695
09/93 3077-HWE
Doc code 636 718
Control LEDs
The function display tells you whether the signals from the footswitch or
handswitch are being correctly received and interpreted:
for ZOOM UP
for ZOOM DOWN
Using the motor to set the
The handswitch or the footswitch transmits on RD_2 or RD_3 the codes which
zoom position
correspond to the functions:
Data format:
ASCII 8-bit with start bit
repeating at 2.3-millisecond intervals
+5W/-8V
The logics on the receiver board (processor) assign the codes received to their
appropriate functions:
ZOOM UP
ZOOM DOWN
The control signals (0V/5V) for ZOOM UP and ZOOM DOWN reach the
logics board in the microscope via the swingarm cable.
Presetting the zoom
displacement speed
The voltage level of ZOOM SPEED depends on the position of the potentio-
meter on the panel board.
Level of ZOOM SPEED
min. ZOOM SPEED
2.10V +- 0.25V
max. ZOOM SPEED
5V +- 5%
5-14