Protection Circuitry Indicators - Krell Industries KRC-HR Owner's Reference Manual

PROTECTION CIRCUITRY
The KRC-HR is the first high-end preamplifier to have protection circuitry at
the input and output. The indicators on the KRC-HR, which are described
below, will give you a general location of a problem in your audio system.
1. When the KRC-HR's monitoring circuitry recognizes excessive DC levels at
one of the inputs, the output disconnects from the front-end circuits and the
LED corresponding to that input will flash repeatedly until the problem is
removed. If you try to select that input, the preamplifier will not respond to
the command.
To check the input, remove the cables corresponding to the flashing input
and inspect them with an ohm meter. The flashing LED should become
steady within 5 seconds of removing the suspect input. If the cabling
appears to be sound, try another source component into the suspect input.
If the KRC-HR LED continues to flash, unplug the unit and contact your
dealer or KRELL. If the problem ceases, have the component originally
connected to that input checked out at your dealer or at the factory.
2. If the KRC-HR's monitoring circuitry recognizes a short at the output, the
output disconnects from the front end circuitry, the DC voltage to the
preamplifier's circuits disconnects and the blue power LED flashes. Remove
and check all the cabling and components connected to the KRC-HR. Unplug
the KRC-HR from the AC wall socket. Wait for one minute and plug the unit
back into the AC wall socket. The flashing blue power LED should now stop
flashing and the unit should follow the standard turn on sequence. If the
unit does not perform in this manner, contact your dealer or KRELL.
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