HP Landscape Lighting 410C User's Manual | Page 48
TM 11-6625-1614-15
Model 410C
instrument circuitry in an effort to localize the pro-
blem. These operations should be undertaken only
after it has been established that the difficulty can not
be eliminated by the Adjustment and Calibration Pro-
An investigation should
also be made to insure that the trouble is not a result
of conditions external to the Model 410C.
5-38. Conduct a visual check of the Model 410C for
possible burned or loose components, loose connec-
tions, or any other obvious conditions which
might
suggest a source of trouble.
5-39. Table 5-9 contains a summary of the front-
panel symptoms that may be encountered. It should
beueed in initial efforts to select a starting point for
troubleshooting operations.
5-40. Table 5-10, in conjunction with Figure 5-5,
contains procedures which may be used as a guide in
isolating malfunctions. The steps in Table 5-10 des-
cribe the normal conditions which should be encoun-
tered during the checks ( circled numbers in
Figure 5-5.
5-41. The checks outlined in Table 5-10 are not de-
signed to measure all circuit parameters, rather only
to localize the malfunction. .Therefore, it is quite
possible that additional measurements will be required
to completely isolate the problem. Amplifier gain may
also vary slightly between instruments; therefore it
should not be necessary to precisely duplicate wave-
forms or values described.
5-42. Voltage values indicated in Table 5-10 are based
on .5 vdc input, with Model 410C RANGE switch set to
.015 v.
5-43. When required, check power supply voltages
as outlined in Paragraph 5-29.
5-44. Refer to Figure 5-9 for typical waveforms
encountered in the Model 410C. Waveforms represent
signals which occur when instrument is operating
during overdriven conditions (.5 vdc input to .015 v
RANGE).
5-45. SERVICING ETCHED CIRCUIT BOARDS.
5-46. The Model 410C has three etched circuit
Figure 5-5. Troubleshooting Tree
01566-2
5 - 1 4
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