Remove/Replace Tcd Solenoid Switching Valve - HP 5890 SERIES II Service Manual

Remove/Replace TCD Solenoid Switching Valve

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.
1. Set the main power line switch to the off position.
2. Disconnect the power cable from its receptacle.
3. Allow time for the oven and heated zones to cool.
4. When the heated zones are cool, turn off all gas
supplies.
5. Lift the hinged top cover at its front edge,
exposing the detector area.
TO DETECTOR
6. Remove the electronics carrier top cover
(above the signal cable plugs and receptacles
to expose the top edge of the
TCD detector PCB).
7. Remove the right side panel by
removing four screws: two each
along its top and bottom edges.
8. Locate the solenoid valve to
be replaced.
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TOP COVER
SOLENOID VALVE
TO FLOW
BLOCK
SVC 4- 8
RED O VISIBLE
OFF
ELECTRONICS
CARRIER TOP
COVER
ON
SCREWS
SCREWS
RIGHT SIDE
PANEL