HP 5890 SERIES II Service Manual page 216

10. Remove the detector top cover,
and all attached components, from
the thermal strap and set aside.
The following steps require protection against ESD (Electro- Static Discharge).
`
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 handling PCBs (Printed Circuit Boards), always place them in static
`
control envelopes.
11. Disconnect the NPD bead power cable from the detector PCB by pulling it straight off.
12. Remove the NPD detector PCB by sliding it out of the main PCB (at the right side of the instru-
ment). Removal of the PCB will withdraw the interconnect from the thermal strap. Use caution
to avoid damaging the spring at the end of the interconnect.
13. Use a spanner wrench (part no. 19301- 00150) to remove the base spanner nut from the detec-
tor weldment.
14. Remove the thermal strap by removing the five screws securing it to the instrument.
15. Cap the weldment openings at the top (over the jet aperture) and bottom
(inside the column oven) to prevent damage and/or contamination.
16. Remove the two screws securing the detector
weldment to the instrument.
17. Slide the insulation plate out from over the
detector weldment.
18. Remove the insulation around the detector
weldment to expose the two screws securing
the weldment to the instrument.
19. Lift the base up enough to expose the heated
block, heater and sensor cartridge wires.
Handle the heater and sensor cartridges with care to prevent breakage.
cartridges (particularly the smaller sensor cartridge) are fragile.
20. Carefully slide the two cartridges out of the block.
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COLLECTOR
INSULATION
PLATE
HEATED
BLOCK
SVC 6- 25
DETECTOR
COVER
INTERCONNECT
CLAMP SCREW
BASE SPANNER NUT
THERMAL STRAP
HEATER
SENSOR
The