Testing The Rf Modulator - Motorola OM 1000 Installation And Operation Manual

5-2 Troubleshooting
Table 5-2
Common fault indications
Problem
LED not illuminated.
POWER
OM 1000 powers up but fails
to initialize
LED indicator fails to
DATA IN
light
LED lights
PLL ERROR
LED lights
RF ERROR
Main display has poor
readability or blank
Adjusted port settings did not
take effect
No serial port communications
available
Logical Ethernet input port
does not receive data (Fault
Sum LED on)

Testing the RF Modulator

The modulator port has several test modes that can be set through the front panel. Refer to
Section 4, "Setup and Operation." Although these test modes are mainly intended for factory
OM 1000 Installation and Operation Manual
Possible Cause
No power to unit
Blown ac power fuse
BOOTP/TFTP configuration
Mechanical error with unit
No input data received
Internal failure
RF modulator port in Standby
mode
Internal failure
Improper contrast setting or bad
display
Changes were not committed or
saved through the front-panel
display
Changes are being overwritten by
the OM1000.ini file
Port not enabled
The data rate, parity, start bit, or
stop bit settings are not
compatible with the other units in
the headend
Duplicate UDP port number being
used. Two logical Ethernet input
ports were configured to use the
same UDP port number.
Corrective Action
Check the power connection.
Check the fuse.
Check the ac source.
Replace the fuse with one rated at
2A, 250 Vac, slow-blow.
Check the BOOTP configuration
and all the file paths and names
on the server.
Repair or replace the unit.
Check the input cables and
sources.
Check the IP addresses.
Enable the input port.
Repair or replace the unit.
Put the modulator in the Operate
mode.
Repair or replace the unit.
Adjust the contrast until the
display is optimum, or return the
OM 1000 to the factory for repair
or replacement.
Commit and then save the
changes. Reboot the system.
The OM1000.ini file is being
force downloaded as set within the
OM1000.fof file. See Section 4,
"Setup and Operation" for steps
on saving the settings.
Adjust the port settings to match
the settings in the headend
equipment.
Serial port communication
parameters are not compatible
with other headend units.
Change the UDP port number to
be unique across the entire
OM 1000.