2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
1.1-1
1
1
FAULTS
1.1
1.1
IR-cell test displays: ++++ see 2. 3
also after five minutes of oxygen flow:
If the range is higher than
10 V ++++
then the problems are as follows:
1) Too much contamination:
There are one or more
indication ranges and they
are too high.
2). The IR–sources:
The sources are bent or
de-adjusted through
transport. See Remark:
3). Chopper:
The chopper is not running
although the path is not
contaminated and the IR-source´s
is ok.
Remark:
In most cases the problem is
in the IR-sources or in the
power supply. During a rough
transportation the IR-sources
may be bent causing the
problem. See 3.2. We
experienced that this is very
popular for the new IR-detector
and preamplifiers.
We can only help if you send
us a copy of the flow diagram of this chapter, after drawing a line along the path you
followed according to the condition you found.
Asking for detectors, preamplifiers and boards without following this diagram, is useless.
P1
06421 IR13
I R 13 06 4 2 0
1
1 - 1 - 2
Check the IR
source voltage
see
Check the chopper.
For this,
remove the
IR Path. see
Ceck the position
of the IR-sources
see
< Menu > < Cal > displays ++++
Replace the
power supply.
see
IR Source
is defective.
see
Is the
rectifier
warm
yes
no yes
Feel the rectifier (1)
no
Adjust the
IR Source
voltage see
Adjust the zero
see
Check if there
is 1-1,5 VAC
on TP1,board IR21
see
Still
faulty
Does the
chopper
run
no
Replace the
spring see
Replace the
chopper motor
see
no
yes
yes
no
yes
Replace the
IR21 board
see
Voltage
correct
1-1 S
Too
low or
zero
Zero
Replace path
see
Check for
contaminated
IR - path
Too low
Replace the
IR preamplifier
see and
Check for proper
Cable connection
to IR21 board
Replace the
IR detector, see
Attention!
Consider the detector
only as a last resort!
If after replacing the
detector the fault still
exists, then reinstall
the old detectors
Is there
any
voltage
?
3.1
3.2
2.4
?
3.4
3.2
?
3.5
2.4
3.5
?
2.3
2.3
?
?
3.1
3.3
2.3 3.1
3.1
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