5.2 Replacing the Printed Circuit Board
Items required:
•
Medium flat-blade screwdriver
•
Medium Phillips screwdriver
•
Replacement printed circuit board (P/N 19-0418)
Procedure:
(See Figure 7)
1. Turn OFF instrument and lay it face down on work area.
2. Remove battery cover and batteries.
3. Remove sensor-matching resistor.
4. Remove four screws securing rear case.
5. Carefully lift rear case and flexible arm assembly away
from instrument, being careful not to pull wires attached to
printed circuit board. Lay rear case face down on work area.
6. Carefully remove printed circuit board from front case.
7. Unplug connectors J2 and J3 from printed circuit board.
8. Plug connectors J2 and J3 into new printed circuit board;
then install board into front case.
9. Install flexible arm assembly and rear case using the
screws that were removed in Step 4.
10. Replace sensor-matching resistor.
11. Replace batteries and battery cover.
12. Test instrument response (refer to Section 4.2).
Maintenance
12
Leakator 10
Instruction 19-9167
