Troubleshooting
6. Check the M ain b
oard readouts:
a. Press the down (▼) arrow to select MAIN BOARD.
b. Press the right (►) arrow to scroll through each of the voltage readouts
(+5.0 V, +3.3 V, –5.0 V, +5.2 V raw, +7.0 V). If a voltage is good, OK
is displaye
d.
NOTE. If the +5.2 V voltage is bad, check the Combiner board. If any of the
other voltages are bad, replace the Main board.
c. Press the right (►) arrow to scroll through each of the detected peak
levels for the LTC Primary and Backup inputs. For example, the LTC1
Primary input is indicated by LT C1 P P K and the Backup input is
indicated by LTC1 B P K.
If no signal is present, the levels will be near 0 V. If a signal is applied, then
a detected level will be present. The gain of the detector is about 0.7, so a
5 V input will result in a detected peak level of about 3.5 V on the display.
NOTE.
If a signal is applied to a LTC input and the detected peak level is not
correct, then replace the Main board.
d. Press the right (►) arrow to scroll through each of the threshold voltages
for t
he LTC inputs. For example, the threshold for the LTC1 input is
indicated by LTC1 NEG.
For
a 1 V threshold, expect a readout of about 0.4 V on the display. For
a 2 V threshold, expect a readout of about 0.85 V. For a 5 V threshold,
expect a readout of about 2.15 V on the display.
NOTE. If the LTC thresholds are not as expected, replace the Main board.
4–8 ECO8000 Series Service Manual
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