Page 1
WORLDWIDE
SUMMARY OF WARRANTY
The Crown Audio Division of Crown International, Inc., 1718 West
Mishawaka Road, Elkhart, Indiana 46517-4095 U.S.A. warrants to you, the
ORIGINAL PURCHASER and ANY SUBSEQUENT OWNER of each
NEW Crown
1 product, for a period of three (3) years from the date of
purchase by the original purchaser (the warranty period) that the new
Crown product is free of defects in materials and workmanship, and we
further warrant the new Crown product regardless of the reason for failure,
except as excluded in this Crown Warranty.
1 Note: If your unit bears the name Amcron, please substitute it for the
name Crown in this warranty.
ITEMS EXCLUDED FROM THIS CROWN WARRANTY
This Crown Warranty is in effect only for failure of a new Crown product
which occurred within the Warranty Period. It does not cover any product
which has been damaged because of any intentional misuse, accident,
negligence, or loss which is covered under any of your insurance contracts.
This Crown Warranty also does not extend to the new Crown product if the
serial number has been defaced, altered, or removed.
WHAT THE WARRANTOR WILL DO
We will remedy any defect, regardless of the reason for failure (except as
excluded), by repair, replacement, or refund. We may not elect refund
unless you agree, or unless we are unable to provide replacement, and
repair is not practical or cannot be timely made. If a refund is elected, then
you must make the defective or malfunctioning product available to us free
and clear of all liens or other encumbrances. The refund will be equal to the
actual purchase price, not including interest, insurance, closing costs, and
other finance charges less a reasonable depreciation on the product from
the date of original purchase. Warranty work can only be performed at our
authorized service centers. We will remedy the defect and ship the product
from the service center within a reasonable time after receipt of the
defective product at our authorized service center. All expenses in
remedying the defect, including surface shipping costs to the nearest
authorized service center, will be borne by us. (You must bear the expense
of all taxes, duties and other customs fees when transporting the product.)
HOW TO OBTAIN WARRANTY SERVICE
You must notify us of your need for warranty service not later than ninety
(90) days after expiration of the warranty period. All components must be
shipped in a factory pack. Corrective action will be taken within a
reasonable time of the date of receipt of the defective product by our
authorized service center. If the repairs made by our authorized service
center are not satisfactory, notify our authorized service center
immediately.
DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES
YOU ARE NOT ENTITLED TO RECOVER FROM US ANY INCIDENTAL
DAMAGES RESULTING FROM ANY DEFECT IN THE NEW CROWN
PRODUCT. THIS INCLUDES ANY DAMAGE TO ANOTHER PRODUCT
OR PRODUCTS RESULTING FROM SUCH A DEFECT.
WARRANTY ALTERATIONS
No person has the authority to enlarge, amend, or modify this Crown
Warranty. This Crown Warranty is not extended by the length of time which
you are deprived of the use of the new Crown product. Repairs and
replacement parts provided under the terms of this Crown Warranty shall
carry only the unexpired portion of this Crown Warranty.
DESIGN CHANGES
We reserve the right to change the design of any product from time to time
without notice and with no obligation to make corresponding changes in
products previously manufactured.
LEGAL REMEDIES OF PURCHASER
No action to enforce this Crown Warranty shall be commenced later than
ninety (90) days after expiration of the warranty period.
THIS STATEMENT OF WARRANTY SUPERSEDES ANY OTHERS
CONTAINED IN THIS MANUAL FOR CROWN PRODUCTS.
9/90
NORTH AMERICA
SUMMARY OF WARRANTY
The Crown Audio Division of Crown International, Inc., 1718 West Mishawaka
Road, Elkhart, Indiana 46517-4095 U.S.A. warrants to you, the ORIGINAL
PURCHASER and ANY SUBSEQUENT OWNER of each NEW Crown product,
for a period of three (3) years from the date of purchase by the original purchaser
(the warranty period) that the new Crown product is free of defects in materials
and workmanship. We further warrant the new Crown product regardless of the
reason for failure, except as excluded in this Warranty.
ITEMS EXCLUDED FROM THIS CROWN WARRANTY
This Crown Warranty is in effect only for failure of a new Crown product which
occurred within the Warranty Period. It does not cover any product which has
been damaged because of any intentional misuse, accident, negligence, or loss
which is covered under any of your insurance contracts. This Crown Warranty
also does not extend to the new Crown product if the serial number has been
defaced, altered, or removed.
WHAT THE WARRANTOR WILL DO
We will remedy any defect, regardless of the reason for failure (except as
excluded), by repair, replacement, or refund. We may not elect refund unless you
agree, or unless we are unable to provide replacement, and repair is not practical
or cannot be timely made. If a refund is elected, then you must make the defective
or malfunctioning product available to us free and clear of all liens or other
encumbrances. The refund will be equal to the actual purchase price, not
including interest, insurance, closing costs, and other finance charges less a
reasonable depreciation on the product from the date of original purchase.
Warranty work can only be performed at our authorized service centers or at the
factory. We will remedy the defect and ship the product from the service center
or our factory within a reasonable time after receipt of the defective product at our
authorized service center or our factory. All expenses in remedying the defect,
including surface shipping costs in the United States, will be borne by us. (You
must bear the expense of shipping the product between any foreign country and
the port of entry in the United States and all taxes, duties, and other customs fees
for such foreign shipments.)
HOW TO OBTAIN WARRANTY SERVICE
You must notify us of your need for warranty service not later than ninety (90)
days after expiration of the warranty period. All components must be shipped in
a factory pack, which, if needed, may be obtained from us free of charge.
Corrective action will be taken within a reasonable time of the date of receipt of
the defective product by us or our authorized service center. If the repairs made
by us or our authorized service center are not satisfactory, notify us or our
authorized service center immediately.
DISCLAIMER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES
YOU ARE NOT ENTITLED TO RECOVER FROM US ANY INCIDENTAL
DAMAGES RESULTING FROM ANY DEFECT IN THE NEW CROWN
PRODUCT. THIS INCLUDES ANY DAMAGE TO ANOTHER PRODUCT OR
PRODUCTS RESULTING FROM SUCH A DEFECT. SOME STATES DO
NOT ALLOW THE EXCLUSION OR LIMITATIONS OF INCIDENTAL OR
CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR
EXCLUSION MAY NOT APPLY TO YOU.
WARRANTY ALTERATIONS
No person has the authority to enlarge, amend, or modify this Crown Warranty.
This Crown Warranty is not extended by the length of time which you are
deprived of the use of the new Crown product. Repairs and replacement parts
provided under the terms of this Crown Warranty shall carry only the unexpired
portion of this Crown Warranty.
DESIGN CHANGES
We reserve the right to change the design of any product from time to time without
notice and with no obligation to make corresponding changes in products
previously manufactured.
LEGAL REMEDIES OF PURCHASER
THIS CROWN WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, YOU
MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE.
No action to enforce this Crown Warranty shall be commenced later than ninety
(90) days after expiration of the warranty period.
THIS STATEMENT OF WARRANTY SUPERSEDES ANY OTHERS
CONTAINED IN THIS MANUAL FOR CROWN PRODUCTS.
9/90
Telephone: 219-294-8200. Facsimile: 219-294-8301
Telephone: 219-294-8200. Facsimile: 219-294-8301
THREE YEAR
FULL WARRANTY
YEAR3 YEAR3
Page 2
Printed on
recycled paper.
The lightning bolt
triangle is used to
alert the user to the
risk of electric shock. The exclamation point
triangle is used to alert the
user to important operating
or maintenance instructions.
WARNING
TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOISTURE!
Magnetic Field
CAUTION! Do not locate sensitive high-gain
equipment such as preamplifiers or tape decks
directly above or below the unit. Because this
amplifier has a high power density, it has a strong
magnetic field which can induce hum into unshielded
devices that are located nearby. The field is stron-
gest just above and below the unit.
If an equipment rack is used, we recommend locat-
ing the amplifier(s) in the bottom of the rack and the
preamplifier or other sensitive equipment at the top.
IMPORTANT
THE POWER BASE-3 REQUIRES CLASS 1
OUTPUT WIRING. THE POWER BASE-1 AND
2 REQUIRE CLASS 2 OUTPUT WIRING.
The information furnished in this manual does not include all of the details of design, production, or variations of the
equipment. Nor does it cover every possible situation which may arise during installation, operation or mainte-
nance. If you need special assistance beyond the scope of this manual, please contact our Technical Support
Group.
Crown Audio Division Technical Support Group
Plant 2 SW, 1718 W. Mishawaka Rd., Elkhart, Indiana 46517 U.S.A.
Phone: 800-342-6939 (North America, Puerto Rico and Virgin Islands) or 219-294-8200
Fax: 219-294-8301 Fax Back: 800-294-4094 (North America only) or 219-293-9200
Internet: http://www.crownintl.com
C A U T I O N
RISK OF ELECTRIC SHOCK
DO NOT OPEN
TO PREVENT ELECTRIC SHOCK DO
NOT REMOVE TOP OR BOTTOM
COVERS. NO USER SERVICEABLE
PARTS INSIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
DISCONNECT POWER CORD BE-
FORE REMOVING BACK PANEL
COVER TO ACCESS GAIN SWITCH.
A V I S
RISQUE DE CHOC ÉLECTRIQUE NOUVREZ PAS
Ã- PRÉVENIR LE CHOC ÉLECTRIQUE
NENLEVEZ PAS LES COUVERCLES. IL
NY A PAS DES PARTIES SERVICEABLE
Ã- LINTÉRIEUR. TOUS REPARATIONS
DOIT ETRE FAIRE PAR PERSONNEL
QUALIFIÉ SEULMENT. DÉBRANCHER
LA BORNE AVANT DENLEVER LA
COVERTURE EN ARRIÈRE.
Page 11
Power Base Series Power Amplifiers
Page 12
The unit should never output heavy common-mode cur-
rent unless its circuitry is damaged. Activating drive
protection helps prevent further damage.
3.3.4 Transformer Thermal Protection
All
Power Base amplifiers have transformer thermal
protection. This protection circuitry is activated in un-
usual situations where the units transformer tempera-
ture rises to unsafe levels. Under these abnormal
conditions, the unit removes power to the high-voltage
transformer. The fan will continue to run in all units
ex-
cept those with 220/240 VAC transformers. The ampli-
fier will return to normal after it cools to a safe
temperature.
It is very unlikely that your
Power Base amplifier will
ever activate transformer thermal protection as long as
it is operated within rated conditions. Your amplifier is
designed to continue operating under conditions
where other amplifiers would fail. But even when you
exceed the limits of a
Power Base amplifier, it still pro-
tects itself-and your investment-from damage.
3.3.5 Fuses and Circuit Breakers
All 120 VAC, 60 Hz units and all
Power Base-3 units
have a fuse that protects the low-voltage power supply
and cooling fan. The
Power Base-1 and Power Base-2
high-voltage power supplies are protected by fuses,
while the
Power Base-3 high-voltage power supplies
are protected by a circuit breaker. With rated loads
and output levels, these fuses (or the circuit breaker)
should only shut down the amplifier in the incredibly
rare instance of a catastrophic amplifier failure. The
ODEP protection system keeps the amplifier opera-
tional under most other severe conditions. The fuses
(or breaker) can also shut down the amplifier in situa-
tions where extremely low-impedance loads and high
output levels result in excessive current draw.
A
Power Base amplifier will not blow its fuses or trip its
breaker unless something is wrong. In the rare event
that an internal fuse blows, please refer the unit to a
qualified technician. If the breaker in a
Power Base-3
trips, try to identify and correct the problem before re-
setting it with the back panel Circuit Breaker Reset. If
the problem persists, refer the unit to a qualified techni-
cian.
3.4 Controls
The Power switch is th only control located on the front
panel. All others are located on the rear, including the
level controls.
When making any setup or wiring changes, dont forget
to turn off the amplifier, turn down the level controls and
disconnect the power cord. Be sure to turn down (full
counterclockwise) the channel 2 level control when us-
ing either mono mode. The Parallell Mono/Stereo/
Bridge Mono switch is used to select Stereo, Bridge-
Mono or Parallel-Mono operating modes. The Input
Ground Lift switch isolates the phone jack input
grounds from the chassis ground to help prevent
ground loops. It does
not affect any installed input ac-
cessories. The Input Sensitivity Switch, located inside
the back cover plate, sets the amplifiers input sensitiv-
ity (refer to subsection 2.3 for information on changing
this switch). And the
Power Base-3 has a back panel
Circuit Breaker Reset button that resets the circuit
breaker (refer to subsection 3.3.5).
CH-2
INPUT GROUND LIFT
(AFFECTS PHONE INPUTS ONLY )
(MONO) INPUT
GAIN
CH-1
INPUT GAIN LIFT 0
1
2 3
4
5
6
7
8
9
10 1112 0
1
2 3
4
5
6
7
8
9
10 1112
CHANNEL 2
LEVEL CONTROL CHANNEL 1
LEVEL CONTROL
3.5 Filter Cleaning
A dust filter is provided on the units air intake. If it be-
comes clogged, the unit will cool less efficiently and
may produce lower output levels. To clean the filter,
use a phillips screwdriver to remove the three screws
the secure the front grille. Use mild dishwashing deter-
gent and warm water for best cleaning results. Be sure
the filter is dry before you reinstall it. Replacement fil-
ters may be ordered from the factory.
Dust filters are not 100% efficient-long term this may
require internal heat-sink cleaning by a qualified tech-
nician. Internal cleaning information is available from
our Technical Support Group.
Fig. 3.1 Back Panel Level Controls
