Crown 2-650 - Manual (Page 19)

19
T r o u b l e s h o o t i n g . . .
Status Indication
There is a microprocessor inside each PULSE amplifier responsible for monitoring all critical systems. The
status of which are displayed on the front panel lights.
Their indication is as follows:
Fault and both Temp lights flashing
The amplifier has just been plugged in and the microprocessor is carrying out a test sequence. This is
normal and will stop after about 7 seconds.
Power light on, Operate light off, Fault light on & flashing
The microprocessor has been unable to start the main power supply. If the condition persists for more than
1 hour without an input signal, check the rear panel fuse. If the fuse is blown and a replacement also fails
(or the fault persists), return the amplifier to an authorized service center. Information is in the Service &
Warranty sections.
Power light on, Operate light off, Fault light on (not flashing)
(The Operate and Fault light may be flashing very slowly accompanied by internal clicking). A fault has
been detected with one or more of the amplifier channels and the processor has shut down the power
supply to protect both the amplifier and your speakers. Depending on the fault it may try to resume
operation again indefinitely, or give up after a number of attempts. If after disconnecting all input and
output leads and switching the amplifier off and on again (to reset it), the condition persists, return the
amplifier to an authorized service center. Information is given in the Service & Warranty sections.
Power light on, Operate light on, Fault light on, Temp light on
One or both of the heatsinks have exceeded their maximum temperature. When in this condition, the
channel associated with each Temp light will be muted until the temperature has fallen to a safe level.
Normal operation will then automatically resume. The most likely causes of an over-temperature condition
are blocked rear air intake, obstructed front air exhausts or, if fitted, clogged fan filters.