2002 by ELTRA GmbH Germany – January 2002 – Service Manual OH 900 / ON 900 / ONH 2000
1.8-1
1.8
1.8
The LED for the temperature regulation of the infrared cell or the
thermoconductivity cell does not flash :
A ) IR - Cell
For detailed explanation, see 2. 5
Is it
higher or
lower than
5.25VDC?
Replease
the TH61
Check the DC voltage
between Pin4 and Pin5
of the NR32 see 2.5
Check the
cable
see 1.8
Check the voltage
on the TP1 of NR32
See 2.5
Replace
the NR32
Adjust
see 2.5
Replace the
temperature sensor
200VDC
between Pin
4 and 5
of the NR32?
See 2.5
Replace
the TH61
Check the cable
connecting NR32 to
TH 61. See 1.8
220 VACZ ERO
Is it
220VAC
or zero?
Measure the AC
supply voltage to
of the NR32 (6-7)
see 2.5
Is it
around 200VDC
or zero?
20 0 VDC
Replace
the NR32
Replace the sensor when
the resistance is lower
than 6 kOhm
Is it
still always
on or off?
The LED of the IR Cell thermostatization
does not flash
YES
ZERO
NO YES
Check the DC voltage
between TP2 and TP1
on the TH 61 see 2.5
NO
Check the DC voltage
between TP2 and TP3
of the TH 61. See 2.5
Adjust around 5.25VDC
See 2.5
Check the cable
connecting NR32 to
TH 61. See 1.8
Check the 13 Pin plug
of the TH61. See 1.8
Remove the plastic cover
and check the cable
connections
Check the wiring see 4.2
Check the 13 Pin plug
of the TH61.
See 1.8
Remove the plastic
cover and check
the cable connections
Is the
voltage on
the capacitor
over 250VDC
or is it almost
zero?
NO
Measure the DC voltage
between TP2 and TP1
of the TH 61. See 2.5
Is
the LED
still always
off ?
200VDC
on the
heaters?
NO YES
Check the voltage of the
heaters see 2.5
The board
NR32 is ok
Is it
higher than
5.25V?
Is the
resistance
much lower than
6 kOhm?
Replace the TH61
NO
Replace
the TH61
Replace
the NR32
Measure the resistance
of the sensor
Check the connection
of the temperature
sensor in the 13 Pin
plug. See 1.8
>2 5 0 VDCZ ERO
LO WER
HIGHER
YES
YES
Measure the resistance
of the sensor
Check the connection
of the temperature
sensor in the 13 Pin plug.
See 1.8
Measure the voltage
on the capacitor 100µF
on the NR32 see 2.5
Adjust P1 on the TH61 board see 2.5
z e ro 20 0 VDC
About
200VDC or
zero?
O FF
ON
Replace
the NR32
1-14
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