Avalon VT-747SP - Trouble Shooting

8.0 Trouble Shooting
If you experience any problems with your
Vt-747sp, please make sure to first isolate the
problem to your Vt-747sp. In many cases the
problem can be a bad cable or another piece
of equipment in the signal path.
It is easiest to isolate the problem by removing
as many pieces of extraneous gear in the
signal path as possible. If you believe that
your Vt-747sp has a problem, please set up
the following test system:
1. Plug your input source (keyboard, synthesizer
or line input) into Vt-747sp; make sure to check
your cables.
2. Connect the output of Vt-747sp directly to your
powered speakers or monitor system. Use the
OUTPUT control on the Vt-747sp to adjust the
volume.
Once you have isolated the problem to the
Vt-747sp please check the following list for
suggested solutions.
Page 30 Avalon Vt-747sp Operation Manual
Trouble Shooting
AVALON DESIGN
Problem
No Power
No Power
Lights dim /
no sound
No sound
Hum or buzzing
noise
Distorted sound
Distorted sound
Cause
Power cable on back of chassis not
securely plugged in
Fuse blown due to power surge or
improper AC voltage setting
Improper AC voltage setting
Bad cable
ground loop
Vt-747sp is overheating
Input source overloading
Solution
Plug in power cable
Replace fuse (page 12) and check AC
voltage setting (page 11)
Check AC voltage setting (page 11)
Check cables
Check cable wiring and grounding, lift
ground on Vt-747sp (page 10)
Make sure Vt-747sp has adequate
cooling and ventilation (page 12)
Try a different input source, reduce
input level control
Vt-747sp Trouble Shooting Table