62 THE BLUE BOX LT HARDWARE TROUBLESHOOTING
LCDBBHTS03Sept08
HARDWARE TROUBLESHOOTING (Continued)
If address is displayed, a problem exists somewhere 2.
along the bus.
Troubleshoot the bus using the “Bus splitting tech-•
nique” for a powered bus – refer to the “System
Diagnostics Tools” section of the O&M
If a “0” is displayed, address the card using the •
“AUTO-ADDRESSING” screen and define it in
the “Bus Map” screen
If unable to read the address, 3. power cycle the card
and read address again.
If address is displayed, a problem exists some-•
where along the bus
If a “0” is displayed, address the card through the •
“AUTO-ADDRESSING” screen and define it in
the “Bus Map” screen
If address is not displayed still, control card needs •
to be replaced; contact LC&D for a replacement.
DTC TROUBLESHOOTING
If the DTC shows no display, follow the steps below:
Check for power to the DTC.
Vary contrast to the darkest setting.4.
Open low-voltage panel door. On the back of the •
display clock, the “contrast” dial can be used to
vary the display contrast
Using a small Phillips screw driver to turn the con-•
trast dial:
- Clockwise to turn up the contrast
- Counter-clockwise to turn down the contrast
Power cycle the DTC.5.
Disconnect the clock cable on the back side of the •
clock display that connects to the control card
Re-connect cables and wait for a few seconds for •
the clock display to show up
Disconnect master panel from the bus:6.
Disconnect both Cat. 5 cables connected to the •
master panel and wait for a few seconds
If the display shows up, the problem on the bus •
exists with the Cat. 5 cabling
Replace clock cable with a new one7.
Disconnect clock cable•
Replace with a new cable and wait a few seconds •
for display to show up
If replacing the clock cable does not fix the problem, 8.
DTC needs to be replaced; contact LC&D for a re-
placement.
If the DTC displays the message: “Upload in Progress,” the
clock is either in the middle of a software upgrade or it
was interrupted and got stuck. The fix to this problem is
to re-upload the DTC software, if this does not correct
the problem, the DTC will need to be replaced. Contact
LC&D for a replacement.
TRANSFORMER TROUBLESHOOTING
The transformer should have 120/277 V ac on the prima-
ry side and the secondary side should have 20 V between
the two outer terminals and 10 V between the center and
either outer terminal.
If the voltage on the primary side is not 120/277 Vac, 1.
Check to see if the breaker is in the ON position •
and that there is voltage from the breaker to the
transformer
If the voltage on the primary side is correct (120/277 2.
Vac) and any of the devices in the panel are not re-
ceiving appropriate voltage:
Check the voltage on the secondary side terminals•
If there is a 120/227 Vac supply from the breaker to 3.
the transformer, but not sufficient or steady voltage
supply on the secondary side:
Transformer needs to be replaced: contact LC&D •
for a replacement.
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