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5 Maintenance
5.8 TROUBLE SHOOTING CHART
SYMPTOM
A.
Unit does not turn ON
when actuating Power
Switch (Motor does not
turn).
B. No Zero Control (with
unit on Zero gas). Out-
put is either dead or
fully saturated.
5-8
CORRECTIVE ACTION
(a) Check AC voltage at inlet for
correct voltage. Reset breaker
or switch to supply power to
(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.
(a) Check that Power is ON and
chopper motor energized.
(b) Check that power supply voltages
are correct (+15VDC, Ä15VDC).
(c) Check output of TP6 on preamp
board with a DC voltmeter (should
be less than + or Ä 3VDC). If
output can be zeroed, check volt-
ages at TPl and TP2 on Linearizer
board (should also be zero). Then
check adjustments on E/I board.
(d) Check that infrared source is
operating. If cold, check
source element resistance and
connections.
(e) Check output of preamplifier
Teledyne Analytical Instruments
receptacle.
Model 7120
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Troubleshooting
