Service manual

PN 4237242C
4.14-2
SERVICE AND REPAIR PROCEDURES
VACUUM SENSOR CARD
5. Disconnect the three electrical connectors J1, J2, J3.
6. Remove the two tubes coming from the VIC that attach to solenoids LV1 (from FF 9-1)
of the normally open port and LV2 (from FF 10-1) of the normally closed port
(Figure 4.14-1).
Note: Marking these lines before disconnecting them will save having to trace them back
on installation.
7. Remove the tubing and adapters connecting pressure transducer port P2 and the
common port of LV1 (Figure 4.14-1).
Installation
1. Connect the tubing from the common port of LV1 to port P2 of the pressure transducer
(Figure 4.14-1). Use new tubing if replacement looks necessary.
2. Connect the tubing that traces back to a Y-fitting (FF 9-1), to the normally open port of
LV1 (Figure 4.14-1).
3. Connect the tubing that eventually traces back to a Y-fitting (FF 10-1), then a fluid
barrier, to the normally closed port of LV2 (Figure 4.14-1).
4. Connect the electrical connectors (Figure 4.14-1):
r P1 to J1
r P2 to J2
r P3 to J3.
5. Install the new Vacuum Sensor card onto its three snap-on posts (Figure 4.14-1).
6. Close the upper chassis.
7. Reconnect the ac power cable.
8. Turn ON the instrument’s power.
Verification
1. Perform the Vacuum Adjustment procedure (Heading 4.30). If no adjustment is needed,
misadjust and readjust to verify that the Vacuum Sensor tracks vacuum changes.
2. Perform an SVP (Heading 5.1).