Teledyne 514 Instruction Manual page 44

5.0 Maintenance & Troubleshooting
Symptom
Calibration voltages near zero
on local analysis meter (less
than standard 9 VDC).
Shift in readings at concentra-
tion meter.
Noisy output at concentration
meter (or noisy recorder trace).
Trace wanders (erratic or noisy
signal at concentration meter.)
Nonlinear output as a function
of concentration of the sample;
output noisy.
Concentration meter operates
backwards; meter deflection is
from right to left.
5–6
Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies
Cause
Source lamp burned out.
Changes in voltage to source
lamp, i.e., changes in line
voltage supply to lamp.
Preamplifier not providing a
strong enough output signal.
Source lamp burned out.
Clamp circuit defective (signal
not clamped to ground).
Filters in filter wheel installed
incorrectly.
Corrective Action
Check lamp and replace, if
necessary. After replacement,
adjust optics (refer to section ×).
Check transformer at source
lamp module; replace, if neces-
sary. Check line voltage regulat-
ing transformer in power mod-
ule; replace, if necessary.
Check preamplifier output
signal. Use either J3 at pream-
plifier or connector pin 6 at
switch driver. Replace preampli-
fier circuit card, if necessary.
Check voltage at calibration
meter. If both voltages are
well below 9 VDC, check/
replace source lamp.
Check for clamped video input
to auto. gain control (check
TP1); replace switch driver and
clamp circuit card, if required.
Check switch signal outputs
from switch driver and clamp
circuit card: P, P', S, and S'.
Check filter installation. The
measuring filter should be
installed adjacent to the white
painted arc (see Figure 5-1).