Troubleshooting - Vox VC-4 User Manual

Troubleshooting

1. The VC-4 is not powering up when con-
nected to the amp
➢ Is the power on the Valvetronix amp switched
on?
➢ Is the VC-4 properly connected to the Val-
vetronix amp?
➢ Is the correct cable being used?
Please check that all connections are properly
made and that the contacts on the VOX BUS jack
on the rear of the VC-4 and your amp are kept
clean.
2. Effects cannot be switched on/off with the
VC-4
➢ Is the VC-4 in Individual mode?
➢ Are the MOD, DELAY or REVERB sections on
the Valvetronix amp off?
➢ Are the MOD, DELAY or REVERB sections on
the Valvetronix amp bypassed?
➢ Is the correct cable being used?
Please check the effect settings on the Valvetronix
amp and make sure the VC-4 is switched to Individ-
ual Mode.
3. Effect(s) cannot be heard even if they are
switched on by the VC-4
➢ Are the effects on the Valvetronix amp
bypassed?
Please check the settings on the Valvetronix amp. If
bypass is "on", none of MOD, DELAY, REVERB
effects will be heard.
4. The pedal on the VC-4 does not control the
effect being selected
➢ Is the pedal set properly?
➢ Is an external volume pedal being used?
In order to get the Expression pedal to function as
an expression controller, keep the TAP TEMPO
button pressed for more than 1 second until the
Expression pedal LED lights up on the VC-4.
Also, check that the EX CTL switch, the setting of
the MOD section and/or the setting of the PEDAL
section on the Valvetronix amp are set properly.
TIP! When hooking up an external volume
pedal to the VC-4 via the volume jack on the
VC-4, the built in pedal automatically reverts
to Expression only and volume is controlled
by the external pedal only.
10
5. The external volume pedal does not work
➢ Is the connection properly made?
➢ Is the correct cable being used?
➢ Is the cable broken?
➢ Is the external volume pedal compatible with the
VC-4?
Please check the connection and cable. If the exter-
nal volume pedal allows for a minimum setting,
please set the value as low as possible.
6. The calibration needs to be adjusted on the
built-in pedal and/or an external volume
pedal
In case you aren't getting the maximum or mini-
mum effect when the pedal or an external volume
pedal is used, please re-calibrate the VC-4 via the
following steps.
TIP! When you calibrate the pedal, use your
hand because using your foot may not enable
an accurate adjustment.
a) Re-Calibrating the VC-4 using the built-in
pedal.
1. First, make sure that the power to the Valvetronix
amp is off.
2. Then, turn on the power to the Valvetronix amp
while holding down footswitch 3 and the TAP
TEMPO button on the VC-4. Doing this will
cause the Bank Display to show "
ond and then " .
"
3. Slowly "open" the pedal until it is fully "open" as
shown in the diagram below.
4. Press the TAP TEMPO switch on the VC-4. This
will set the minimum Expression/Volume setting
and the Bank display will show "
in the diagram below)
5. Slowly press the Expression/Volume pedal down
until it is fully closed as shown below.
TIP! Pressing the FX ON-OFF/CHANNEL
button on the VC-4 will terminate the adjust-
ment.
6. Press the TAP TEMPO switch on the VC-4. The
Bank Display will show "
return to normal operation.
for a sec-
"
. (as shown
"
and the VC-4 will
"