Teledyne 400E - Page 7

Model 400E Ozone Analyzer
Instruction Manual
Table of Contents
P/N 04316 Rev: B vii
11.1. GENERAL TROUBLESHOOTING HINTS ........................................................................................... 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. GAS FLOW PROBLEMS ................................................................................................................. 252
11.2.1. Typical Flow Problems..................................................................................................... 252
11.3. CALIBRATION PROBLEMS ............................................................................................................. 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. OTHER PERFORMANCE PROBLEMS .............................................................................................. 255
11.4.1. Temperature Problems..................................................................................................... 255
11.5. SUBSYSTEM CHECKOUT............................................................................................................... 257
11.5.1. AC Mains Configuration.................................................................................................... 257
11.5.2. DC Power Supply ............................................................................................................. 258
11.5.3. I
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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. REPAIR PROCEDURES.................................................................................................................. 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
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Scrubber............................................................................ 267
11.6.4. Replacing the IZS O
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Scrubber........................................................................................ 268