Crest Audio CKd 604 Owner's Manual page 25

Identifying CKd Amplifier Fault Codes and Amplifier Firmware Revision
This document explains how to identify the fault codes and versions displayed on the
front and rear panel LED's during the initialization process of CKd amplifiers.
When the amplifier is turned on via the front panel switch or remotely, the amplifier
begins an initialization process. This process has three phases;
1. All LED's On
2. Faults and Version on LED's
3. Channel initialization
The "All LED's On" phase occurs first when power is turned "On". All the LED's will light
for about 1 second. Then the Signal LED's will display the revision of the amplifier
firmware (which is separate from the NexSys module firmware) and the "Mute" LED's
will display any faults. If there are no faults, all of the "Mute" LED's will be off.
The "Faults and Version" phase will be displayed for a minimum of 1 second or as long
as faults are active. The lit Signal LED's represent the binary version number. Once all
the faults are cleared, the amplifier will continue to the "Channel Initialization" phase.
Next, all the LED's will shut off and each channel will simultaneously initialize. During
"Channel Initialization", all channels will simultaneously activate, lighting the Active LED.
The channel is now active. If a channel does not activate, make sure the attenuation
knob is turned up and that the channel is not deactivated in software.
There are three levels of 'Faults'; Device Faults, Power Supply Faults and Channel Faults.
 Device Faults are ones that affect the entire device and prevent all channels from
passing audio.
 Power Supply Faults only prevent its associated channels from passing audio.
 Channel Faults only prevent individual channels from passing audio.
Device Faults can be flagged even when the amplifier, power supplies or channels are
active or not active. During a Device Fault, the PS LED will blink at a fast rate. While the
PS LED is blinking, the Mute LED's will indicate which fault triggered as noted below:
 CH1 Mute LED: +15 Volt Rail fault
 CH2 Mute LED: -15 Volt Rail fault
 CH3 Mute LED: -5 Volt Rail Fault
 CH4 Mute LED: AC Voltage Line Fault
 CH5 Mute LED: Logic Rail Monitor Fault
 CH6 Mute LED: Fan Fault
 CH7 Mute LED: Audio CoDec Voltage Fault
 CH8 Mute LED: ADC Rail Monitor Fault
Please note: When the PS LED is blinking at a fast rate, a Device Fault occurred.
CKd Series Owners Manual v1e
CKd Owner's Manual
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