Crown CTs 4200 Operation Manual page 18

6 Troubleshooting
page 18
CONDITION: No sound, even though
the amp has power. Power LED is on
without flashing and the amp is receiving an
input signal. Signal indicator is flashing.
• Speakers not connected.
• Open circuit due to speaker failure.
• There is a short on the amplifier
output. First disconnect your speakers
from the affected channel(s) one by one
to determine if one of the loads is
shorted.
• DC or excessive low-frequency signal at
the amplifier's output has enabled
speaker protection.
CTs Multi-Channel Power Amplifiers
CONDITION: Thermal indicator is
flashing.
POSSIBLE REASON:
• The amplifier has become too hot for
safe operation. Check for loads less than
2 ohms, and for excessive input levels.
Check for proper ventilation and proper
mode-switch setting. Driving low-
impedance loads while in high-voltage
mode can cause overheating.
CONDITION: All channel thermal
indicators are flashing.
POSSIBLE REASON:
• Power supply thermal overload.
CONDITION: No input signal.
(Signal indicator is not flashing even though
audio is applied and channel is ready).
POSSIBLE REASON:
• Input signal level is very low.
• Input cables have become disconnected.
CONDITION: Bridge LED is flashing.
POSSIBLE REASON:
• The mode switch was switched while the
power was on.
Operation Manual