Delta 110 digital pre-amplifier
Check list
Should you have any difficulty in operating your pre
amplifier, check the following before suspecting that a fault
has developed.
No power and LED not illuminated. Check that:
1. the mains supply is connected and that the mains lead is
fully home in the mains inlet socket at the rear of the amplifier
2. the mains is switched on and that the power switch on
the front panel is depressed and has fully latched.
3. the fuse in the mains plug has not blown and that the
mains socket in the wall is live (test with another item/appliance).
Power on and LED illuminated but output from
one loudspeaker only. Check that;
1. the output leads are connected into the correct input
sockets on the power amplifier
2. both the left and right channeis of the selected source are
connected correctly and the input wiring is not faulty (check by
swapping over the left and right input connectors). If in doubt contact
your dealer.
3. the balance control is positioned at' 12 o'clock'.
Loud hum heard through loudspeakers when DISC
is selected. Check that:
1. the ground lead from the turntable (if fitted) is connected
firmiy to the ground terminal on the rear of the amplifier
2. the amplifier is correctly earthed via the mains lead.
3. your cartridge is not sited directly above your amplifier's
mains power transformers ¡move the amplifier away and check if the
hum level changes).
4. other transformers in the vicinity are not radiating into the
Delta 110.
Loud hum heard through only one loudspeaker
when DISC is selected. Check that;
1. the ground wire is not faulty within the respective
channel's lead. This is easily checked by swapping over the leads and
checking if the hum moves to the other channel.
2. the headshell leads connected to the cartridge on the
respective channel are not faulty or loose. If in doubt please consult
your dealer
Power on and LED illuminated but no output from
the amplifier. Check that:
1. the amplifier is connected to the desired input and that
the correct input on the amplifier is selected.
2. the output leads are connected to the correct input
sockets on the power amplifier
3. the volume control is not set to minimum.
4. if'disc'is selected, that the cartridge selector switch is set
to the correct type of cartridge. NB. Do not operate this switch with the
volume control turned up.
5. if 'CD' is selected, your machine is playing a CD.
6. the pre-amplifier is not in 'mute' or 'standby' modes.
7. headphones are not plugged into the Delta 110, as this
automatically mutes the main outputs.
8. if the digital inputs are being used, the output from the
digital source is switched on.
Loud hissing and crackling from speakers via
digital inputs (possibly with residual audio signal)
1. check the connection between the CD player's digital
output and the Delta 1 lO's digital input.
2. if the digital output of your CD player is switchable,
ensure the switch is in the 'opposition.
12
(6 pages)
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