HP 5890 SERIES II Service Manual page 107

Do not over- tighten the jet! Over- tightening may permanently deform and damage
the jet, the detector base or both.
16. Install the replacement jet finger- tight. (Use two fingers on the nut driver to obtain this tight-
ness).
17. Tighten the jet 1/8- turn past finger- tight using the nut driver.
18. At the bottom of the detector, inside the column oven, install the column and any associated
hardware removed in step 12.
The following steps require protection against ESD (Electro- Static Discharge).
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Use a grounded wrist strap (part no. 9300- 0969 - large, or 9300- 0970 - small)
connected to a suitable ground. Failure to heed this caution may result in
damage to the instrument.
When storing or in between handling of PCBs (Printed Circuit Boards), always
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place them in static control envelopes or enclosures.
19. Install the NPD detector PCB by sliding it into
its mounting location on the main PCB (at the
right side of the instrument). Installation of the
PCB will insert the interconnect into the thermal
strap. Use caution to avoid damaging the
spring at the end of the interconnect.
20. Tighten the screws on the clamps which secure
the interconnect to the thermal strap.
21. Install the detector top cover, and all attached
components, on the thermal strap.
22. Use a Pozidriv screwdriver to secure the detec-
tor cover to the thermal strap with three screws.
23. Restore all gas supplies to the instrument and
check for leaks at all installed fittings.
24. If the system is leak free, install the right side
panel and secure using four screws.
25. Install the electronics carrier top cover.
26. Restore power to the HP 5890 Series II.
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SVC 4- 37
Clamps
Interconnect
COVER