Remove/Replace Npd Jet; Svc - HP 5890 SERIES II Service Manual

Remove/Replace NPD Jet

HAZARDOUS VOLTAGES ARE PRESENT IN THE INSTRUMENT WHEN THE
`
POWER CORD IS CONNECTED. AVOID A POTENTIALLY DANGEROUS SHOCK
HAZARD BY DISCONNECTING THE POWER CORD BEFORE WORKING ON THE
INSTRUMENT.
NITROGEN PHOSPHOROUS (NPD) DETECTORS USE HYDROGEN GAS AS
`
FUEL. BE SURE ALL HYDROGEN GAS IS TURNED OFF AT ITS SOURCE BEFORE
REPLACING ANY FLOW COMPONENTS.
1. Set the main power line switch to the off position.
2. Disconnect the power cable from its receptacle.
3. Turn off all gas supplies.
4. Lift the hinged top cover at its front edge,
exposing the detector area.
5. Remove the electronics carrier top cover.
6. Remove the right side panel by
removing four screws: two each
along its top and bottom edges.
ELECTRONICS
CARRIER TOP
COVER
7. Loosen the screws securing the clamps
holding the detector PCB interconnect in place.
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SCREWS
SCREWS
RIGHT SIDE PANEL

SVC 4- 35

RED O VISIBLE
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