Agilent Technologies 7820A Service Manual

8
Agilent 7820 GC Service
Replacing the logic board ................ 216
Replacing the analog and power board ..... 220
Replacing Components Inside the Lower Rear Metal
Cover ....................................... 223
Replacing the AC board ................... 223
Replacing the oven triac ................. 224
Replacing the power transformer .......... 226
10 Valves 229
Valves ...................................... 230
Introduction ............................. 230
Valco W-series minivalves ................ 231
Gas sample valves ........................ 233
Valve Box ................................... 234
Installing the valve box ................. 234
Removing the valve box assembly .......... 238
Actuators ................................... 240
Installing the actuators ................. 240
Valve actuator drivers ................... 242
Replacing a solenoid valve (new style) ...... 242
Valve actuator alignment ................. 246
Typical Valve Configurations ................ 247
Custom Plumbing (diagram required), Option 700
.......................................... 247
Gas Sampling Option, Option 701 or 751 ... 248
Column Isolation, Option 702 or 752 ...... 248
Two Stream Selection (Requires Gas Sampling),
Option 703 or 753 ........................ 249
Custom Plumbing (Diagram Required), Option 800
.......................................... 249
Gas Sampling with Backflush of Precolumn to Vent,
Option 801 ............................... 250
Gas Sampling with Backflush to Detector, Option
802....................................... 250
Gas Sampling with Sequence Reverse and Backflush
of Column 1, Option 805 .................. 251
Troubleshooting ............................. 252

Agilent Technologies 7820A Specifications

General

Brand	Agilent Technologies
Model	7820A
Category	Laboratory Equipment
Language	English