Control Leds; Using The Motor To Set The Zoom Position; Presetting The Zoom Displacement Speed - Leica WILD M695 Service Manual

Description of control unit MEL64/65
09/93 3077-HWE

Control LEDs

Using the motor to set the
zoom position
Presetting the zoom
displacement speed
5-14
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
The handswitch or the footswitch transmits on RD_2 or RD_3 the codes which
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.
The voltage level of ZOOM SPEED depends on the position of the potentio-
meter on the panel board.
min. ZOOM SPEED
max. ZOOM SPEED
Service manual M695
Doc code 636 718
Level of ZOOM SPEED
2.10V +- 0.25V
5V +- 5%