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Detector Troubleshooting - HP 5890 SERIES II Service Manual

Gas chromatograph.
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Problem
1. No signal output to exter-
nal data handling device
(i.e., integrator, etc.).
2. Strange chromatograph
output. Test chromato-
gram is ok.
3. Strange chromatograph
output. Test chromato-
gram is not ok.
4. Instrument has two detec-
tors installed but only rec-
ognizes one.
5. FID will not ignite.
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Detector Troubleshooting

Probable Cause
a. Improper keyboard or ex-
ternal device operation, or
improper cabling.
a. Faulty detector PCB.
b. Faulty main PCB.
a. Faulty signal cable.
a. Faulty detector PCB.
b. Faulty main PCB.
a. Improper operation.
b. Faulty ignitor switch on
flow manifold.
c. Faulty ignitor.
SVC 4- 3
Corrective Action
1. Refer to operation and ref-
erence manuals as well as
the manuals for the exter-
nal device.
1. Replace detector PCB.
2. If problem persists, install
original detector PCB and
refer to probable cause b.
1. Replace main PCB.
1. Disconnect signal cable
and run the instrument
self- test.
2. If " FAULT: DAC 1 TEST"is
indicated, suspect faulty
main PCB. Otherwise, sus-
pect a faulty cable or exter-
nal device.
1. Swap detector PCBs.
2. If problem persists, swap
back original detector
PCBs to starting configura-
tion and refer to probable
cause b.
3. If problem follows the
swapped PCB, replace the
suspect PCB with a known
good PCB.
1. Replace main PCB.
1. Refer to operation and ref-
erence manuals to ensure
that proper type, quality,
and flow of gases are be-
ing used.
1. Replace ignitor switch on
flow manifold (refer to Sec-
tion 3 of this document).
1. Replace ignitor (refer to
Section 4 of this docu-
ment).

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