Fisher 846 Instruction Manual page 21

CAUTION
Do not use chlorinated solvents for
cleaning the pilot/actuator assembly.
The chlorinated solvents will deteriorate
the rubber diaphragm.
b. Make sure the O-rings are lightly lubricated with
silicone grease and properly seated.
c. Reassemble and check operation.
d. If after cleaning the Type 846 does not function,
replace the pilot/actuator assembly with a new one.
e. Reassemble and check operation.
2. Remove the electronic circuit board from the mod-
ule final assembly. Section 6 – Maintenance describes
how to remove the board.
a. Inspect the O-rings around the sensor for dam-
age and replace them if necessary.
b. Check the sensor port and areas around the
sensor for foreign material, and clean if necessary.
c. Reassemble and check operation.
d. If the Type 846 does not function, replace the
electronic circuit board with a new one. Refer to
Electronic Circuit Board in Section 6 for complete
removal information.
e. Reassemble and check operation.
3. The module subassembly is aligned at the factory
and should not be further disassembled. If the above
steps fail to produce a working unit, the module subas-
sembly is faulty and should be replaced.
Type 846
5–5