FE ZAJ, Service Manual

Page: 19 / 28

TN512955-E
13
6-2. Troubleshooting
Indication
fluctuates large.
No output
Span adjustment
cannot be made.
Zero adjustment
cannot be made.
Is ambient vibra-
tion large?
Is ambient
noise large?
Is it reduced?
Is it reduced?
By stopping measured gas
By stopping measured gas
and reference gas
Is there
any power noise?
Is PC board
abnormal?
Is power supply
supplied?
To external
terminal]
Is fuse burn
out?
Does measure-
ment gas flow?
Is reference gas
pressure normal?
Does reference
gas flow?
Is air
contained?
To reference
gas line]
Does measure-
ment gas pressure
fluctuate?
For reference
gas joint
Is cap screw
loose?
Is reference gas
line properly air-
tight?
Is valve fully
open.
Needle valve
for reduce
valve
Take anti-vibration
countermeasure.
Include buffer tank
in exhaust line.
Reduce pressure
fluctuation.
Tighten cap
screw.
Perform air-tightness
check about
reference gas line.
Reduce noise.
Replace PC
board.
Overhaul
Check power
supply line.
Replace fuse.
Check measure
-
ment gas line.
Check reference
gas supply source.
Open needle
valve fully.
Replace restrictor
and filter.
Purge reference
gas line.
YES
YES
YES YES
YES
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
YES
NO
NO
NO
NO
NO
NO
NO
NO
YES
NO
YES
YES
NO
YES
YES YES
NO