Krell Industries KRC-HR manual Protection Circuitry

PROTECTION CIRCUITRY

The KRC-HRis 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 LEDcorresponding 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-HRLED 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'smonitoring

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 LEDflashes.

Remove

and

check

all

the

cabling

and components

connected to

the

KRC-HR. Unplug

the

KRC-HRfrom 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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