Single Gas Instrument Service Manual
Page 6
Bacharach, Inc.
Instruction
0019-9166
2.2 Closing the Case
Figure 2-2.
P.C.B. and
Chamber Assem-
bly
Removal and
Installation
Equipment Needed:
• Phillips-Head Screwdriver, No. 1
Procedure:
CAUTION
When replacing the P.C.B. and chamber assembly, the P.C.B. must
be installed FIRST. The P.C.B. switches could be damaged if the
P.C.B. is installed after the chamber assembly is in place.
1. Ensure that the P.C.B. is properly positioned face down over its locating-tab
on the front case (Fig 2-2).
2. Properly position the chamber assembly between the ribs of the front case.
3. Slide the rear case over the inlet port and properly join the two case halves
together.
4. Secure the case halves to each other using the two screws removed in Sec-
tion 2.1, Step 4 (Tighten to 18–24 oz. in.).
5. Reinstall the batteries (observe proper battery polarity); replace the battery
cover; and attach the elastic strap’s metal clip to the bottom of the instru-
ment.
