Agilent Technologies 6850 Series Operating and installation instructions

6850 Series GC System Service Information
Released: April 2004
Part No. G2630-90649 1
Contents
Introduction
Covers
Inlets and valves
Detectors
Oven
Electronics
G2629A Control Module
Manuals and other parts
Troubleshooting

Released: April 2004 6850 Series Gas Chromatograph Service Procedures 2
Introduction 1
About this manual
About this edition
Safety information
How to use this manual
Tools and test equipment

Introduction
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About this manual
This manual is intended for use only by Agilent-
trained service personnel who are familiar with
the physical and safety requirements of working
on the 6850 series gas chromatograph (GC).
These procedures supplement the operation and
maintenance information found in the GC user
information.
About this edition
© Agilent Technologies 1999-2002, 2004
All Rights Reserved. Reproduction, adaptation, or
translation without permission is prohibited,
except as allowed under the copyright laws.
Part No. G2630-90649
First edition, April 2004
Replaces Part No.G2630-90647, G2630-90648
Safety information
The Agilent 6850 GC meets the following IEC
(International Electro-technical Commission) clas-
sifications: Transient Overvoltage Category II,
Pollution Degree 2. The IEC Safety class rating
is I.

Introduction
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This unit has been designed and tested in accor-
dance with recognized safety standards and is
designed for use indoors. If the instrument is
used in a manner not specified by the manufac-
turer, the protection provided by the instrument
may be impaired. Whenever the safety protection
of the instrument has been compromised, discon-
nect the unit from all power sources and secure
the unit against unintended operation.
Refer servicing to qualified service personnel.
Substituting parts or performing any unautho-
rized modification to the instrument may result in
a safety hazard.
The instrument weighs approximately 23 kg
(50 lbs) and therefore should be moved in an
upright position by two people supporting the
bottom of the unit.
Sound Emission Certification for
Federal Republic of Germany
Sound pressure
Sound pressure Lp < 48 dB(A) according to
DIN-EN 27779.
When operating the 6850 with the cryo valve
option, the sound pressure is 92.5 db(A) during
cryo valve operation for short burst pulses.
Schalldruckpegel
Schalldruckpegel LP < 48 dB(A) nach DIN-EN
27779.
Bei Betrieb des 6850 mit Cryo Ventil Option
treten beim Oeffnen des Ventils impulsfoermig
Schalldrucke Lp bis ca. 92.5 dB(A) auf.

Introduction
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Released: April 2004 6850 Series Gas Chromatograph Service Procedures 5
Electromagnetic compatibility
This device complies with the requirements of
CISPR 11. Operation is subject to the following
two conditions:
• This device may not cause harmful interfer-
ence.
• This device must accept any interference
received, including interference that may
cause undesired operation.
If this equipment does cause harmful interfer-
ence to radio or television reception, which can
be determined by turning the equipment off and
on, the user is encouraged to try one or more of
the following measures:
• Relocate the radio or antenna.
• Move the device away from the radio or tele-
vision.
• Plug the device into a different electrical out-
let, so that the device and the radio or televi-
sion are on separate electrical circuits.
• Make sure that all peripheral devices are also
certified.
• Make sure that appropriate cables are used
to connect the device to peripheral equip-
ment.
• Consult your equipment dealer, Agilent
Technologies, or an experienced technician
for assistance.
• Changes or modifications not expressly
approved by Agilent Technologies could void
the user’s authority to operate the equip-
ment.

Introduction
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Symbols
Warnings in the manual or on the instrument
must be observed during all phases of operation,
service, and repair of this instrument. Failure to
comply with these precautions violates safety
standards of design and the intended use of the
instrument. Agilent Technologies assumes no
liability for the customer’s failure to comply with
these requirements.
WARNING
A warning calls attention to a condition or
possible situation that could cause injury to
the user.
Caution
A caution calls attention to a condition or
possible situation that could damage or
destroy the product or the user’s work.

Introduction
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How to use this manual
Hot-links used in this manual are shown in blue
for easy identification. Most hot links are jumps
to other locations in this manual, but some are
links to other documents. Once you are in
another file, you can return to this document by
clicking The “Service Manual” bookmark or by
clicking the Acrobat “Go to Previous View”
button until you reach the correct page.
See accompanying instructions for more
information.
Indicates a hot surface.
Indicates hazardous voltages.
Indicates earth (ground) terminal.
Indicates explosion hazard.
Indicates electrostatic discharge hazard.
Indicates a radioactivity hazard.
Indicates a pinch hazard.

Introduction
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Tools and test equipment
Table 1-1. Tools required
1/2-inch adjustable wrench
1/2-inch x 7/16-inch open end wrench
1/8-inch allen wrench
3/16-inch wrench
3-mm allen wrench for actuator
5/16-inch x 1/4-inch open end wrench
7/16-inch wrench x 3/8-inch open end wrench
9/16-inch x 5/8-inch open end wrench
9/16-inch x 7/16-inch open end wrench
Flat blade screwdriver
1/4-inch hex nut driver
7-mm hex nut driver
No. 1 Posidriv screwdriver
No. 2 Posidriv screwdriver, 4-inch shaft
T-10 and T-20 Torx drivers
Inlet wrench
Column cutter
Blanking plug, finger-tight style
ESD protective wrist strap
Ferrule, no hole or plug
FID flow measuring insert
MPC plumbing kit
Plug, 1/8-inch brass (6-pack)
Pneumatic LK test kit
Tube, assembly tool PTFE
Tweezers
Volt/Ohm meter
Flow Tracker 1000 Flowmeter
Handheld electronic leak detector, 110 V
Handheld electronic leak detector, 220 V
Agilent GC Firmware Update Utility or greater

Released: April 2004 6850 Series Gas Chromatograph Service Procedures 9
Covers 1
Replacement Parts
External covers
Internal covers
Detector electronic cover and column
hanger
Connector cover plates (in lid)
Replacement Procedures
Back cover
Raising the lid to the service position
Electronics cover
Front cover (with keyboard and
display)
Lid top cover

Covers
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Replacement parts
External covers
HP 6850 Series
GC System
Front panel housing
Marquee
G2630–40170
G2630–60630
G2630–40140
Detector cover Screw, shoulder,
M4 x 9 mm
0515–3005

Covers
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Released: April 2004 6850 Series Gas Chromatograph Service Procedures 11
External covers, continued
S/N 6205464
CO-EZ-11AA MICRO ENET 2CH Ethernet Address: 00-00-00-00-00-00 0000-000
LAN
Back panel
G2630–00030
Supply tubing assembly
G2630–60650
3-way valve assembly mount
G2630–80640
Screws, M4 × 12 mm
0515–2496

Covers
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Internal covers
Detector electronics cover
G2630–00290
Lid switch pin
G2630–20870

Covers
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Internal covers, continued
Switch assembly
3101–3558
Electronics cover
G2630–00220

Covers
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Detector electronic cover and
column hanger
Column hanger,
obsolete, order
Detector electronics cover
G2630–00290
G2630-80800

Covers
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Released: April 2004 6850 Series Gas Chromatograph Service Procedures 15
Connector cover plates (in lid)
Screw, M4 x 12 mm
0515-2556
Pneumatics connector
G2630-00680
covers
(8 plates)

Covers
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Replacement procedures
Back cover
WARNING
Shock hazard. Before beginning, turn off the
instrument and disconnect the power cord.
1. Disconnect all cables from the back of the
instrument.
2. Turn off all supply gases at their sources,
then disconnect all gases from the bulkhead
connectors on the back of the instrument.
3. Remove the seven T-20 Torx screws on the
back cover.
4. Replace the cover. Then, reinsert and tighten
the screws.
S/N6205464
CO-EZ-11AA MICROENET 2CH EthernetAddress: 00-00-00-00-00-00 0000-000
LAN
Remove

Covers
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Raising the lid to the service
position
WARNING
Do not work on the instrument unless the
stop plate is raised, preventing the lid from
accidentally falling closed while you are
working.
When closing the lid, have someone else hold
the lid for you.
Never disconnect the safety wire. If the
safety wire is disconnected, the GC can
become unbalanced.
Caution
Check behind the lid to make sure the area is
clear of obstructions before opening the lid
to the service position.

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1. Open the lid.
2. Loosen the screw on the side of the counter-
balance cam that secures the stop plate. The
stop plate will drop down. Raise the cover to
the full upright service position. See the
figure below.
3. When servicing is complete, move the lid to
the normal open position and slide the stop
plate all the way up into position behind the
roller. Tighten the stop plate screw.
Electronics cover
WARNING
Shock hazard. Before beginning, turn off the
instrument and disconnect the power cord.
To remove the electronics cover:
1. Open the lid.
2. Raise the lid to the service position. See
“Raising the lid to the service position” on
page 1-17 for details.
Stop plate
Screw

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3. Remove the two T-20 Torx screws shown
below and loosen the two 7-mm nuts.
4. Slide the electronics cover off the
instrument.
Remove screws
Loosen nuts

Covers
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Released: April 2004 6850 Series Gas Chromatograph Service Procedures 20
5. Disconnect the cover switch connectors.
Caution
Be careful not to pull the metal contacts off
of the switch when disconnecting the wires.
Front cover (with keyboard and
display)
WARNING
Burn hazard. The oven may be very hot.
Before beginning, turn off the oven and allow
it to cool.
Disconnect