Instruction Manual

748297-E June 2003

Model NGA2000 HFID

Preamp Assembly 656945

Case Pressure Purge

Switch 903690

Computer Analysis Board 659149

Sensor Board

657060

Safety Board

657499

Power Supply Board

655764

Case Temperature Sensor 656026

Figure 4-12. Electronics Assembly – Exploded View

Printed Circuit Boards

When replacing a circuit board, the following procedure is recommended:

1.Per Section 4-2e on page 4-13, re- move securing hardware from elec- tronics assembly and lay on bench.

2.Remove securing hardware from printed circuit board to be replaced, do not disconnect cable(s).

3.One at a time, remove the wiring con- nectors and attach to replacement board.

Mount replacement board to electronics assembly.

4-14 Maintenance and Troubleshooting

Rosemount Analytical Inc. A Division of Emerson Process Management