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Model 400E Ozone Analyzer
Instruction Manual
Table of Contents
P/N 04316 Rev: B
vii
11.1.
G
ENERAL
T
ROUBLESHOOTING
H
INTS
........................................................................................... 243
11.1.1.
Interpreting Warning Messages ....................................................................................... 244
11.1.2.
Fault Diagnosis With Test Functions................................................................................ 247
11.1.3.
Using the Diagnostic Signal I/O Function ........................................................................ 248
11.1.4.
Internal Electronic Status LED’s....................................................................................... 250
11.1.5.
Relay Board Status LED'S ............................................................................................... 251
11.2.
G
AS
F
LOW
P
ROBLEMS
................................................................................................................. 252
11.2.1.
Typical Flow Problems ..................................................................................................... 252
11.3.
C
ALIBRATION
P
ROBLEMS
............................................................................................................. 254
11.3.1.
Mis-Calibrated................................................................................................................... 254
11.3.2.
Non-Repeatable Zero and Span ...................................................................................... 254
11.3.3.
Inability To Span – No Span Key ..................................................................................... 255
11.3.4.
Inability to Zero – No Zero Key......................................................................................... 255
11.4.
O
THER
P
ERFORMANCE
P
ROBLEMS
.............................................................................................. 255
11.4.1.
Temperature Problems..................................................................................................... 255
11.5.
S
UBSYSTEM
C
HECKOUT
............................................................................................................... 257
11.5.1.
AC Mains Configuration.................................................................................................... 257
11.5.2.
DC Power Supply ............................................................................................................. 258
11.5.3.
I
2
C Bus .............................................................................................................................. 259
11.5.4.
Keyboard/Display Interface .............................................................................................. 259
11.5.5.
Relay Board ...................................................................................................................... 259
11.5.6.
Motherboard ..................................................................................................................... 261
11.5.7.
CPU................................................................................................................................... 263
11.5.8.
RS-232 Communications ................................................................................................. 263
11.6.
R
EPAIR
P
ROCEDURES
.................................................................................................................. 265
11.6.1.
Repairing Sample Flow Control Assembly....................................................................... 265
11.6.2.
Disk-on-Chip Replacement Procedure ............................................................................ 267
11.6.3.
Replacing The Reference O
3
Scrubber............................................................................ 267
11.6.4.
Replacing the IZS O
3
Scrubber ........................................................................................ 268