JBL Synthesis
Troubleshooting
60
Problem
Possible Cause and Solution
No Video
Make sure that video cables (particularly S-Video cables) are fully
inserted and that the appropriate connector is assigned to the VIDEO IN
parameter in the Input Configuration menu.
Hum
Finding and eliminating audio hum in a complex installation can be a
very frustrating task. Often, the easiest way to identify the culprit(s) is to
systematically eliminate devices from the audio chain. If Cable TV is
connected to any component in the system, start by unplugging the
Cable completely, preferably right at the wall jack. If this eliminates, or
greatly reduces the hum, it is worth a call to your Cable company. A quick
fix, assuming your cable is round 75Ω wire, is to attach a 75-300Ω
transformer to the end, then attach a 300-75Ω transformer to that, so
that the end is back to a round 75Ω wire. There are commercially
available antenna lead isolators which may provide additional insulation
from electrical surges. Also try disconnecting all video connections to
the SDP-3 to see if the video equipment is causing the problem.
Interference with Radio or TV
The SDP-3 does generate minimal amounts of RF energy and is in
compliance with FCC rules and CE standards. If some interfering noise
is noted, move AM loop and FM "T" type antennas away from the
SDP-3
and reorient them as necessary. Use shielded cable for FM and
TV antenna feeds.
Erratic recall of modes
Severe power surges or sags can confuse the SDP-3
memory. To
correct, or if you simply want to start over, restore the factory defaults
with the procedure described at the end of this section.
If all else fails…
Turn off all amplifiers. Turn the master power switch on the SDP-3 rear
panel OFF, wait 10 seconds, then turn it ON again. This causes the unit
to run a diagnostic self-test routine, which takes a couple of seconds. If
the SDP-3 LCD displays normally at the end of this test, no problems
have been found with the SDP-3 circuitry. If the internal tests fail, the
LCD may display an error message, or no message at all. If this
happens, contact JBL Synthesis Customer Service.
If you find that your custom settings are routinely being corrupted, the
lithium battery in the SDP-3 may need replacing. This part is not field-
replaceable — contact JBL Synthesis Customer Service.
If the unit is still behaving erratically, perform the Restore Defaults
procedure described on the following page.
JBL Synthesis maintains a knowledge base on its website
(www.jblsynthesis.com) where you can find answers to
frequently-asked questions and additional troubleshooting
information.
