Chapter 7 Troubleshooting
GC-2014 Service Manual
78
7.3.2 FPD
1. Ignition is not possible.
Cause Countermeasure
The igniter filament has burnt out. Replace the igniter.
2. There is a lot, or a high level, of noise.
Cause Countermeasure
There is a fault in the photomultiplier. Replace the photomultiplier.
The H
2
flowrate is fluctuating. Replace the APC.
7.3.3 FTD
1. The background current does not reach the set value in current mode and the
count for the adjustment time does not start.
Cause Countermeasure
There is insulation failure in the FTD electrode. Check the background level in the ZERO-cleared state
with the monitor main screen.
If it remains greater than the product of the set current
value and 20,000 V (e.g., 60,000 V for a current
setting of 3 pA), and shows no sign of falling, measure
the insulation between the center pin of the FTD signal
cable assembly's BNC connector ("B" in the FTD
configuration diagram) and earth.
If the insulation resistance is less than 10 M
, inspect
or replace the FTD unit assembly. Check whether or not
there is a problem with the insulators ("Reference No.
32" in the FTD configuration diagram) inside the FTD
unit assembly.
2. There is a lot, or a high level, of noise.
Cause Countermeasure
The metal plate on the collector cover is left open
after checking the red-hot state of the alkali
source.
Close the metal plate on the collector cover.
The H
2
flowrate is fluctuating. Replace the APC.
7.4 Chromatogram and Data
1. Peaks are not output or are extremely small; general detector used.
Cause Countermeasure
The channel for detector signal output and the
signal cable connection (ANALOG OUT) do not
agree (in the case of analog output).
Set the channel for detector signal output correctly.
(Refer to 2.2 Outputting Analog Signals to the
Chromatopac in the Instruction Manual.)
Offset calibration of the detector signal has not
been performed correctly (in the case of analog
output).
Perform offset calibration of the detector signal
correctly. (Refer to 2.2 Outputting Analog Signals to the
Chromatopac in Instruction Manual.)
The data format setting for the detector signal is
incorrect.
In the [Signal Settings] in [Configuration settings], set
[DataFile] (data format) to "Chromatopac" in the case of
the C-R8A and to "PC" in the case of GCsolution.
The analog signal-type setting is incorrect (in the
case of analog output).
Specify the setting in accordance with the Chromatopac
used. (Refer to 2.2 Outputting Analog Signals to the
Chromatopac in the Instruction Manual.)
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