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Description microscope M695
Service manual M695
09/93 3077-HWE
Doc code 636 718
Control LEDs
Yellow LEDs on the zoom servo board for the signals
ZOOM UP
ZOOM DOWN
Using motor to set zoom
position...
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.