Fault Detection And Correction List - Leica ST4020 Instructions For Use Manual

7.3

Fault detection and correction list

Issue
• The instrument cannot be
started up
• Display appears blue, but no
text is visible.
• Unit powers up, but the
transfer mechanism does
not initialize.
• The motor does not turn.
• Keypad does not respond to
key presses
Leica ST4020
Possible cause
The power supply cord is
not plugged into wall outlet
properly.
• The power supply cord is
not plugged into the stainer
properly.
• The power supply in the in-
strument is defective.
• The contrast may have to be
adjusted again.
• The control board in the in-
strument is defective.
• The main mechanism is
jammed.
• The motor seems to turn, but
the Lift Bar does not move
because a belt is worn or
broken, or a set screw on
the motor has come loose.
• Motor or control board de-
fective.
• The keypad or the control
board is defective.
7. Troubleshooting
Corrective action
Check the cable connections
at both ends, replace the
power supply cord if neces-
sary.
• Inform Technical Service.
• Adjust the contrast as de-
scribed in Chapter
• Inform Technical Service.
• Check for visible external
obstruction and remove as
necessary.
• Inform Technical Service.
• Inform Technical Service.
5.3.
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