maquet Betastar 1131 Wartungs- Und Reparaturanleitung Seite 205

Test Instruction , Trouble Shooting
2.7 0"-position potentiometers
Voltage supply 15 V, measured when connected between the red and black wires.
The 0-position corresponds to approx. 7.5 V measured between the red and green or the black and green
wires (voltage divider), i.e. half of the setting range of the potentiometer corresponds to a 7.5V voltage.
Troubleshooting:
When pressing the "0" buttons, the function moves into the opposite direction -> exchange the black and
red wires.
A continuous acoustic signal is generated when pressing the "0" buttons -> a potentiometer is defective
or outside the limit range (10V to 180 mV), since the traction cable (table top) is broken or the cable (3)
has slipped from the pulley (4).
For table top "0"-position potentiometers only:
Check the spring pull-back force (5): the cable (3) must be tightened in any position and it must be
possible to extract it manually by 10mm with only little force (see illustration).
9491.0354GB 02 10.06.2000
Hydraulic OR - tables
2.06
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