Teledyne 7320 - NDIR analyzer - Manual (Page 78)

5 Maintenance Model 7320
5-6
Teledyne Analytical Instruments
NOTE
It is recommended that only qualified electronic technicians
troubleshoot electronic failures within the analyzers. Although
both analyzers contain plug-in printed circuit panels, service
personnel should be familiar both with the analyzer theory of
operation and the basics of analog circuit theory before
troubleshooting.
All basic customer electronic adjustments and calibrations of the analyzer
can be accomplished with a DC volt-ohm meter (preferably with a digital
readout). All circuit boards are of the plug-in replaceable type and only
require a DC voltmeter for set-up.
The following is a listing of parts needed for electronic calibration and
troubleshooting of the analyzers:
Accurate DC volt-ohm meter (digital readout) with clip-type leads
Miniature clip-type jumper leads (12" long)
Small blade screwdriver (TAI P/N S-190)
5.8 TROUBLE SHOOTING CHART
SYMPTOM CORRECTIVE ACTION
A .
Unit does not turn ON (a) Check AC voltage at inlet for
when actuating Power correct voltage. Reset breaker
Switch (Motor does not or switch to supply power to
turn). receptacle.
(b) Check power to terminal strip
located inside cabinet. CAUTION:
Terminal strip contains 90-220volt
line voltage which can be hazar-
dous. Check for loose connec-
tion to one of the terminal board
lugs; replace as required.
B. No Zero Control (with (a) Check that Power is ON.
unit on Zero gas). Out-