2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
1.16-1
1.16
1.16
Noise or drift of the infrared baseline
The symtoms are noticeable on the display and especially on the monitor of the attached
PC, when either rhythmic or sporadic jumps of the zero line are present.
The cause for a rhymthic swinging is the chopper motor.
Replace the chopper motor, see 3. 5.
Causes for noise are:
The pre-amplifier,
replace, see 3. 1 and 2.3
The infrared detector,
replace, see 3. 1 and 2.3
A fault on the circuit board IR21,
replace, see 3. 3
The power supply fluctuates,
see 3. 3 and 3. 4
The IR source is defective,
see 3. 2 and 1. 8.
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