HP 5890 SERIES II Service Manual page 116

CONNECTING THE HYDROGEN INLET TUBE AT THE WRONG LOCATION ON THE
FLOW MANIFOLD BLOCK WILL RESULT IN LEAKAGE, CREATING A FIRE AND
EXPLOSION HAZARD.
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.
NOTE
In the next step, avoid touching the lower end
of the collector (end nearest the jet).
Fingerprints and/or other contamination may
cause baseline drift and noise.
45. Install the base spanner nut on the detector
weldment and tighten using a spanner wrench
(part no.19301- 00150).
46. Remove the cap from the detector weldment
top opening.
47. Use an inert gas to blow out the detector weld-
ment, cleansing it of any debris.
48. Ensure that there is no debris in the detector
weldment.
49. Install a new jet in the detector weldment. (Al-
though installation of a new jet is highly recom-
mended, the old jet may be cleaned and in-
stalled at the operator' s discretion. Use an
approved solvent and a cleaning wire to clean
jets.)
Do not over- tighten the jet! Over- tightening may permanently deform and damage
the jet, the detector base, or both.
50. Install the replacement jet finger- tight. (Use two fingers on the 1/4- inch nut driver to obtain
this tightness).
51. Tighten the jet 1/8- turn past finger- tight using the nut driver.
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INSULATION
PLATE
HEATED
BLOCK
SVC 4- 46
JET
BASE SPANNER NUT
THERMAL STRAP
HEATER
SENSOR