Lexicon SDP-40 - Manual (Page 101)

6-3
Troubleshooting and Maintenance
SDP-40
A HUMMING SOUND IS PRESENT IN THE AUDIO.
1. Disconnect the cable television connector (if present) from the
wall outlet. If this eliminates the humming sound, an isolation
device is required. Contact the cable provider for assistance.
2. Disconnect source components to isolate the problem. Once
the problematic component is identified, make sure it is
properly grounded and connected to the same electrical circuit
as the SDP-40.
RF INTERFERENCE IS PRESENT IN THE AUDIO OR VIDEO.
1. Move antennas away from the unit.
2. Move RF emitting devices away from the unit.
3. Replace unshielded cables with shielded cables wherever
possible.
THE UNIT IS EXHIBITING ERRATIC BEHAVIOR.
1. Power the rear panel power switch off. Wait 10 seconds.
Power the rear panel power switch on. (See pages 2-4 and
2-7 for rear panel illustrations.)
2. Document all user-defined settings on the installation
worksheet (see page A-12). Restore factory-default settings
(see pages 1-5 or 6-4).
IF ALL ELSE FAILS . . .
1. Power the rear panel power switch off. Wait 10 seconds.
Power the rear panel power switch on. (See pages 2-4 and
2-7 for rear panel illustrations.)
2. Document all user-defined settings on the installation
worksheet (see pages A-12). Restore factory-default settings
(see pages 1-5 or 6-4).
3. Contact an authorized JBL Synthesis dealer.
4. Contact JBL Synthesis customer service at 818-830-8757.
Note:
Visit www.jblsynthesis.com for additional information.