Troubleshooting
Check the diagnostic
readouts
The diagnostic
readouts include temperatures, input signal levels, supply voltages,
threshold voltages, fan operation, power supply usage hours, RTC battery level,
LED operation, and the power supply load test result. Perform the following
steps to check the diagnostic readouts:
1. Press BACK as necessary to access the top-level menu.
2. Press the up (▲)ordown(▼) arrow to select SYSTEM CONFIG,andthen
press ENTER to access the SYSTEM CONFIG menu.
3. Press the up (▲) arrow to select DIAGNOSTICS, and then press ENTER to
access the DIAGNOSITCS submenu.
4. Check the temperature readouts:
a. If necessary, use the up (▲)ordown(▼) arrow to select
TEMPERATURE.
b. Press the right (►) a rrow to scroll through the Main (CPU) and Power
Supply temperature readouts. Check that each temperature is OK.
NOTE. The Power Supply temperature s (PS1 and PS2) are usually within 5 °C
of the ambient. The Main (CPU) temp is usually 10 °C above ambient. If
Option DPW is not installed, the PS2 temperature readout is “not installed.”
5. Check the Primary and Backup signal levels versus the threshold settings:
a. Press the down (▼) arrow to select CHx PRI vs THRES.
NOTE. The signal levels for each channel are displayed as dB relative to the
threshold that is set for that channel. This is mainly an operational display
rather than a true diagnostic.
If the input is normal and the threshold is set for that signal type, then the
readout should be about +3 dB. If the signal input is absent, then the level
will be lower, such as -10 dB or -50 dB. Any level below 0 dB will cause the
front-panel LED for that input to turn red. The detected input and threshold
voltages that make up this dB ratio are available in other diagnostics t
hat
follow below.
b. Press the right (►) arrow to scroll through each available Primary
channel, verifying that e ach signal level readout is appropriate for the
selected channel.
c. Press the down (▼) arrow to select CHx BACK vs THRES .
d. Press the right (►) arrow to scroll through each available Backup channel,
verifying that each signal level readout is appropriate for the selected
channel.
ECO8000 Series Service Manual 4–7
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