Agilent Technologies 6850 Series

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Troubleshooting

6850

Released: April 2004 6850 Series Gas Chromatograph Service Procedures 287

5. Force the instrument into "Prep Run" by hit-

ting the Prep Run key twice. The inlet pneu-

matic configuration will change to that

depicted below:

Carrier supply

total flow in

6 mL/min

Flow sensor

100 psi

input pressure

Total flow

control loop

Proportional

valve 1

Reduced flow

Full flow -

split flow path

20 psi

Pressure sensor

Septum purge

regulator

fixed @ 3mL/min

Split vent trap

Purge valve

closed

Proportional

valve 2

Column flow: 2 mL/min

Gold seal

Split vent

0 mL/min

Forward pressure control loop

Main Page

Introduction2
- About this manual3
- About this edition3
- Safety information3
- Tools and test equipment8
Covers9
Replacement parts10
- External covers10
- Internal covers12
- Detector electronic cover and column hanger14
- Connector cover plates (in lid)15
Replacement procedures16
- Back cover16
- Raising the lid to the service position17
- Electronics cover18
- Front cover (with keyboard and display)20
  - To remove the front cover:21
  - To install the front cover:22
- Lid top cover23
Inlets and valves25
Replacement parts26
- Split/Splitless inlet26
  - Split/Splitless inlet flow module30
- Purged packed inlet31
- Cool on-column inlet33
  - Cool on-column EPC pneumatic module35
- Programmable temperature vaporization inlet (PTV)36
- Inlet flow modules41
  - Purged packed inlet41
- Any inlet flow module42
- Fans44
- Valves45
Replacement Procedures60
- Injection port cooling fan60
- Split/Splitless inlet61
  - Inlet insert weldment61
  - Shell weldment63
- Purged packed inlet service66
- Cool on-column inlet77
- PTV inlet89
- Diagnostics114
- Leak testing the PTV module only119
- Valves126
Detectors139
Replacement parts140
- Thermal conductivity detector140
- Flame ionization detector142
- Microcell electron capture detector145
- Flame photometric detector147
- Auxiliary flow block155
- Flow module156
- Electronics board157
Replacement procedures158
- Thermal conductivity detector158
  - TCD cell158
- Microcell electron capture detector161
- Flame photometric detector172
Oven207
Replacement parts208
- Fans208
- Heater duct, flap, and flap motor209
- Oven fan motor and heater shroud210
- Column hanger and oven fan blade211
Replacement procedures212
- Oven flap/motor212
  - To remove the oven flap and motor212
  - To install the oven flap and motor215
- Oven heater shroud217
  - To remove the oven heater shroud217
  - To install the oven heater shroud219
- Oven motor and fan220
  - To remove the oven motor and fan220
  - To install the oven fan motor and fan223
- Oven intake fan223
- Injection port cooling fan225
- CO2 cryogenic cooling kit227
Electronics237
Replacement Parts238
- Main board (G2630-60010)238
- Main board (G2630-66015)239
- AC board (G2630-60040)240
- AC board (G2630-60045)241
- Display board242
- Transformer and AC power switch243
- Cables244
Replacement procedures245
- Main boards245
  - To remove the main board245
  - To install the main board247
- AC boards249
  - To remove the AC board assembly249
  - To install the AC board252
- Keyboard/Display254
- Transformer255
  - Replace the transformer and pad255
G2629A Control Module259
- A typical SERVICE method260
- Update firmware260
- Change GC serial number262
- Change oven type262
Manuals and other parts264
Troubleshooting265
Inlets266
- Split/Splitless inlet266
  - Actual pressure is higher than the setpoint (GC is “not ready”)266
  - Cannot achieve setpoint pressure275
- Purged packed inlet291
- Programmable temperature vaporization inlet292
- Cool on-column inlet293
Detectors294
- Flame ionization detector294
- Thermal conductivity detector308
  - Ringing on tail of TCD peaks308
- Flame photometric detector315
- Microcell electron capture detector319
Other320
- Electronic failures320
  - Blown fuses (dead instrument)320
  - Root Cause(s)325
- Valves331

Agilent Technologies 6850 Series - Page 286

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