Page 2
In Canada:
11791 Machrina Way #210
Richmond, B.C. V7A 4V3 Knöll Systems
tel (604) 272-4555
fax (604) 272-5595Knöll Systems, Richmond, BC & Point Roberts WA
C COPYRIGHT 1998-2003, Knöll Systems, All Rights Reserved
In America:
145 Tyee Drive, #1206
Point Roberts, WA 98281
Limited Warranty
Knöll Systems warrants MR1250a and MR1250f amplifiers sold in the USA or
Canada by authorized Knöll dealers to be free from defects in materials and
workmanship. This warranty extends for three full years from the date of
purchase by the consumer. Any products returned freight prepaid to Knöll
Systems and found to be defective by Knöll Systems within the warranty
period will be repaired or replaced at Knöll Systems option, at no charge.
Knöll Systems will not be responsible for the actual cost of installation or
removal of the product, nor for any consequential or incidental damages. Some
states do not allow the exclusion or limitation of incidental or consequential
damages, so the above limitation or exclusion may not apply to you. This
warranty gives you specific legal rights. You may have additional rights which
vary from state to state. Knöll products sold outside of the USA and Canada
may be covered by warranties provided by an authorized Knöll distributor.
Please contact the distributor in the country that the Knöll product was
purchased.
* DMS, Powermatch, Transformer free and Digicom
are trademarks of Knöll Systems
Printed in Canada
5
Troubleshooting
If a problem is encountered with the MR1250a or MR1250f,
the most expedient procedure is to locate the problem and if
possible repair it before requesting service. Be sure to
carefully check other system components such as
controllers, CD players, volume controls, wiring, speakers,
etc. that may be at fault.
Problem Action
Power led does 1. Check that the MR1250 is plugged in.
not light - no sound 2. Test the AC outlet with a lamp.
3. If remote on/off is used, check that
the trigger voltage is at 12 VDC.
4. Check MR1250 power button on (in).
Sound cuts out 1. Verify speaker impedance is 4-16
ohms. Changing speakers may be
required.
2. Check if the MR1250 feels hot. If it's
hot increase cooling - see
Installation.
Sound is distorted 1. Turn the volume down
2. Check speakers for damage.
3. Check inputs for proper levels.
MR1250 gain and source output level
may have to be adjusted.
4. Speakers may be less than 4 ohms.
MR1250a/f does 1. Push MR1250 power switch off (out)
not turn off 2. If trigger is being used, power switch
needs to be set to off (out) position
or amp is on all the time.
3. Try disconnecting trigger jack.
Trigger does not 1. Measure trigger voltage with a volt
work meter. It needs to be 11-15 volts DC
to work (current is about 35mA total
per amp). See page 5 for details.
Speaker pops when 1. Speaker may need resistor placed
amp turned on or off across terminal. Suggest 2k0 1/4 w.
Discharges speaker internal cap.
