Leica WILD M695 Service Manual page 61

Description microscope M695
09/93 3077-HWE
Control LEDs
Using motor to set zoom
position...
Yellow LEDs on the zoom servo board for the signals
ZOOM UP
ZOOM DOWN
The control signals (0V/5V) for ZOOM UP and DOWN reach the zoom board
via the swingarm cable and lamp control board in the microscope. ZOOM
UP/DOWN activates the final-stage transistors on the zoom servo board. The
end-stage comprises a bridging circuit of transistors. In accordance with the
direction of displacement the transistors are activated by two: T1 and T3, or
T2 and T4.
Service manual M695
Doc code 636 718