Dan D'Agostino Momentum Owner's Manual - Page 8

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Maintenance

The Momentum HD Preamplifier requires no user maintenance other than to keep it clean and
ensure that the vents remain unobstructed.
Like a piece of fine furniture, the Momentum HD Preamplifier has a fine, highly polished finish
that can be easily damaged. Do not rub or polish the finish, and do not allow objects to come
in contact with it. To clean the preamplifier, spray a small amount of distilled water onto the
supplied microfiber cloth and gently wipe the preamplifier's surface along the direction of the
metal grain, with light pressure only. Never use a circular motion or heavy pressure, as this can
permanently scratch the machined surfaces. Do not rub the surface with the cloth, and do not
spray any liquid directly onto the preamplifier.
If dust or other contaminants or objects collect around the vents at the top and bottom of the
preamplifier, remove small objects by hand and use a shop vacuum or hand vacuum to remove
the dust. Use a brush attachment on the vacuum to avoid scratching the preamplifier's surface.
If you should need to transport or ship the preamplifier, be sure to use the original packing
materials. Allow the preamplifier to cool down for at least one hour before you wrap or
package it.

TROUBLESHOOTING

Preamplifier will not power up
If the front meter is not illuminated, follow the procedure outlined below. If one step succeeds
in activating the power, stop there and ignore the other steps.
1.
If the LED in the middle of the Standby button on the front of the preamplifier is lit,
push the button to turn the preamplifier on.
2.
If the LED in the middle of the Standby button is not lit, check to make sure the AC
cord is plugged into the wall outlet.
3.
Check at the back of the power supply to make sure the 15-amp IEC connector is
pushed all the way into the jack on the back of the power supply.
4.
Check to make sure the power supply connector cable is firmly connected to the power
supply and the preamplifier .
5.
Remove the the fuse holder at the back, Number 8 in rear panel diagram, of the
power supply. There are two fuses, one is in the active circuit holder and a spare.
Remove the active fuse from the holder and check to see if the fuse is blown. A blown
fuse will have a severed conductor inside and you may see burn marks on the fuse.
If blown, insert the spare fuse and replace the cover on the rear panel. Only use a
fuse of the proper value. Consult your dealer or Dan D'Agostino Master Audio
Systems, LLC if the preamplifier still does not have power.
6.
Check your household electrical box to make sure the circuit breaker has not been
tripped. If it has, flip the breaker back on.
7.
If the breaker trips again, check the speaker cable connection on your amplifier(s) and
the speaker to make sure that the terminals are not shorted, and check the entire length
of the cable to ensure there has been no damage to it.
8.
If all of these steps fail to return power to the preamplifier, consult your dealer for service.
Front indicator is illuminated but you hear no sound
Follow these steps in order. If one step succeeds in restoring the sound, stop there and ignore
the other steps.
1.
Check your amplifier(s) and source device to make sure they are both turned on.
2.
Check the source device to make sure it is playing, i.e., if it's a record player, make sure
it's spinning and the tonearm is lowered, or if it's a CD player, make sure it's in play
mode and not in pause.
3.
Make sure the preamplifier is not muted and that the desired source is selected.
4.
Check the line-level connections between the source device and the preamplifier,
and between the preamplifier and the amplifier(s). Reconnect any cables that may
have become disconnected.
5.
Check the cables between the amplifier(s) and the speakers to make sure they are
properly connected and that the cables have not become damaged.
6.
If you have a spare pair of interconnect cables (even inexpensive ones will work
temporarily), try using them instead of the interconnect cables between the source
device and the preamplifier and between the preamplifier and the amplifier(s). If this
restores sound, replace the defective cables.
7.
If all of these steps fail to restore sound, consult your dealer for service.
Sound comes from only one channel
Follow these steps in order. If one step succeeds in restoring the sound, stop there and ignore
the other steps.
1.
Push the Balance button on the remote to see what the setting is. If the needle on
the front dial is moved to one side, hold the Balance button on the remote down for
2 seconds. The remote's backlight will flash and the needle will return to the center.
2.
Check the interconnect connections between the source device and the preamplifier,
and between the preamplifier and the amplifier(s) to make sure all cables (and XLR-to-
RCA adapters, if you're using them) are securely connected.
3.
Check speaker cable connections for the malfunctioning channel. Reconnect any