Description of control unit MEL64/65

Service manual M695

03/93 3077-HWE

Doc code 636 718

 

 

ControI LEDs

The function display

tells you whether the

signals from the footswitch or

 

handswitch are being

correctly received and

interpreted:

for FOCUS UP

for FOCUS DOWN

for CENTER POSITION

Motorized focusing

The handswitch or 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 +5V/-8V

The logics on the receiver board (processor) assign the received codes to their appropriate functions:

FOCUS UP

FOCUS DOWN

CENTER POSITION

Presetting the focusing displacement speed

The control signals (0V/5V) for FOCUS UP and FOCUS DOWN reach the logics board in the microscope via the swingarm cable.

The voltage level of FOCUS SPEED depends on the setting of the potentiometer on the panel board.

 

 

 

min. FOCUS SPEED

max. FOCUS SPEED

 

 

 

 

 

Zoom

position

25

0.5V-0.7V

2.1V +-5%

 

 

 

 

 

Zoom

position

<8

1.25V-1.7V

5V +-5%

 

 

 

 

 

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