powersoft Duecanali 3904 User Manual

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39
Duecanali User Guide
mode. The red LED will be turned off and the amplier will return
to normal operating conditions only when the output current
draw returns to acceptable levels.
14.3 Thermal protection
All Duecanali Series ampliers use a continuously variable speed
fan to assist cooling (the fan speed changes in response to the
amplier’s cooling needs). If the heat sink temperature reaches
approximately 80°C, the yellow front panel LED starts blinking.
If the temperature should rise above 85°C the thermal sensing
circuitry will mute each power section channels, the yellow LED
will be steadily on, and the power supply will be cut off. At the
same time, the “PROT” warning appears in the rst line of the
LCD display. Once the heatsink has cooled down, the amplier will
automatically reset and the yellow LED will go off. One possible
way to reduce the temperature is to reduce the output power.
14.4 DC fault protection
In order to protect your speakers from mechanical damage caused
by a DC signal coming from the amplier’s output, a DC detection
circuit is placed between the amplier’s output stage and power
supply. If a DC signal or excessive subsonic energy appears at a
channel output an instantaneous protection circuit will cut off the
power supply to both channels. Power supply shutdown is used
instead of speaker relays in order to improve the damping factor
and reliability of Duecanali Series ampliers. At the same time, the
“PROT” warning appears in the rst line of the LCD display.
14.5 Input/Output protection
An ultrasonic network decouples radio frequencies from the
outputs keeping the amplier stable with reactive loads and
protects the loudspeakers against strong very high frequency non-
musical signals above the audible range.
15 User Maintenance
15.1 Cleaning
Before attempting to clean any part of the amplier, rst disconnect
the AC main source. Use a soft cloth and mild nonabrasive
solution to clean the faceplate and chassis. WARNING! Never let
any liquid reach the internal parts of the amplier.
15.2 Service
There are no user-serviceable parts in your amplier. Refer
servicing to qualied technical personnel. In addition to having an
in-house service department, Powersoft supports a network of
authorized service centers. If your amplier needs repair contact
your Powersoft dealer (or distributor). You can also contact the
Powersoft Technical Service department to obtain the location of
the nearest authorized service center.
15.3 Dust Removal
In dusty environments, the front side air lters clog with dust after
prolonged use. The dust gathered in the lters will interfere with
cooling. You may use compressed air to remove the dust from
lters. To remove air lters:
1. rst unscrew the 2 M2 5X8 screws at the sides of the frontal
panel
2. rotate the covering grill
3. repeat the same operation for the other covering grill
filter
cover grill
FIGURE 75: Air lter removal
Air lter cleaning should be scheduled according to the dust levels
in the amplier’s operating environment.
16 Warranty
Product Warranty:
Powersoft guarantees its manufactured products to be free from
defective components and factory workmanship for a period of 48
(forty eight) months, starting from the date of purchase printed on
Powersoft’s (or any of its Authorized Dealer’s) invoice to the end
customer. All warranty repairs and retrots must be performed at
Powersoft facilities or at an Authorized Service Center at no cost
for the purchaser. Warranty exclusion: Powersoft’s warranty does
not cover product malfunctioning or failure caused by: misuse,
abuse, repair work or alterations performed by non-authorized
personnel, incorrect connections, exposure to harsh weather
conditions, mechanical damages(including shipping accidents), and
normal wear and tear. Powersoft will perform warranty services
provided that the product is not damaged during transportation.
Return of Goods:
Goods can be returned to Powersoft only after they have been
granted a Return Merchandise Authorization (RMA) number to be
attached to the external packaging. Powersoft (or its Authorized
Service Center) has the right to refuse any returned good without
a RMA number.

powersoft Duecanali 3904 Specifications

General

Brand	powersoft
Model	Duecanali 3904
Category	Amplifier
Language	English