Troubleshooting - Classe Audio CA-M400 Owner's Manual

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Troubleshooting

In general, refer any service problems to your Classé dealer. Before con-
tacting your dealer, however, check to see if the problem is listed here. If
it is, try the suggested solutions. If none of these solves the problem,
contact your Classé dealer.
1 No sound, and the Channel LEDs are not lit.
✓ The amplifier is not plugged into the AC mains, or the
AC mains are down (circuit breaker, fuse).
✓ A brown-out or short-term loss of power might require
the internal microprocessor to be reset. Unplug the unit
for at least 30 seconds and then plug it in again and try
powering it up.
✓ The AC mains fuse is blown. See Troubleshooting #4, be-
low (or contact your Classé dealer).
✓ The AC mains is out of range. Check the voltage speci-
fied on the rear panel.
2 No sound, and a channel LED is blinking red.
✓ Your protection circuitry may have been engaged. Dis-
connect the amplifier from the AC mains, and disconnect
all inputs and outputs.
✓ Then try to power up the amplifier again, connecting it
only to AC power. If the LED continues to blink, there is
a fault condition in the amplifier itself, and it should be
disconnected and taken to your Classé dealer for service.
✓ If it powers up without any difficulty, power it back down
and reconnect only the inputs. Then restart the amplifier.
If it goes into its blinking protection mode, something is
wrong with a component "upstream" of the amplifier—
probably a DC offset or similar problem. Your amplifier is
trying to protect your loudspeakers (even small amounts
of DC can damage woofers in relatively little time). Try
different source components to discover whether the
problem is limited to a single source, or exists all the time
(which would indicate a problem with the preamplifier).
Contact your dealer for help with the appropriate compo-
nent.
3. The amplifier keeps shutting off.
✓ Make sure you are providing adequate ventilation to the
amplifier, and that the ambient room temperature is below
105°F (40°C).
✓ Run through the troubleshooting sequence outlined
above (assuming the amplifier is going into its protection
mode).