Teledyne 7300a - NDIR analyzer - Manual (Page 79)

Infrared Gas Analyzer Maintenance 5
5-9 Teledyne Analytical Instruments
(b) Chopper hitting housing.
(c) Noisy detector.
(d) AC pickup at printed circuit
board.
(e) Optical unit not grounded to
cabinet.
(f) Detector connections loose.
(g) Faulty preamplifier board.
(h) Contamination in cell.