B.M.C. DAC 1 Owner's Manual - page 7
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7
Volume Control / Variable Output
Troubleshooting
Whenever you suspect a malfunction of the unit, please first check a possible cause by proceeding the
below list, before contacting the B.M.C. service.
No Function or Display
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Check the AC‐power cable is connected at both sides.
∙
make sure there is AC power available at the wall outlet.
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Check the power switch position.
No playback, distorted or interrupted playback
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Check whether the digital signal is not coded PCM (AC3, DTS...).
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Check the source interconnection.
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In case of CD: Check the disc for scratches and dirt.
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In case of USB: Check the computer's sound settings.
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In case of distortions: Set the DAC to 0dB output level.
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Take care the unit is placed on a solid, low‐vibration location.
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Check the interconnection to the following component.
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Check the amplifier's input setting.
Remote control non‐functional
∙
Point with the remote handset to the remote sensor close to the power switch.
∙
Replace the remote handset batteries.
Note: Like any other CD player the DAC1 has micro‐computers inside which may "hang‐up" due to
static discharge or other voltage sparks. In this case power off the unit, wait for about 30 seconds and
power on again.
(Front) DAC1 offers a lossless volume control of a remote B.M.C. power amplifier. The amplifier is
connected via XLR interconnection from the fixed outputs and additionally an optical Toslink cable
connects the DIGM terminals of DAC1 and the B.M.C. amplifier. The optical lines sends a control signal
to the amplifier, so the DAC1 can set the volume via the precise and lossless DIGM feature, as well as
transmit some other commands.
Optional: PreAmp‐Module
(Rear view) DAC1 optionally can be equipped with a preamplifier module.
In addition to the digital inputs this module offers 3 analogue inputs (balanced XLR + 2 x RCA). The
preamp‐module can be configured to match for DIGM operation mode instead of classical preamplifier
mode. This makes the signal path very short and improves the sound quality. Same as above the
volume of any analogue source is set by the DIGM inside the B.M.C. power amplifier.
Another way of using the preamplifier‐module is the classical way, featuring a precision resistor‐network
potentiometer and a single‐ended class‐A LEF output driver. This way the output can be connected
tonon‐B.M.C. power amplifier or active speaker. It is also possible to use this output for connecting with
a RCA input amplifier, by using an adaptor which does not transmit the inverted signal channel.
The internal configuration of the preamplifier module should be either specified when ordering or made
by a qualified service person, according to the attachment "Jumper Settings" on page 14 of this manual.
Please advise your service person to follow the instructions on page 14.
For safety reasons such changes should not be done by an end user.
Pin Configuration of the XLR Terminals
Please take care not to reverse the phase when using XLR interconnections, by checking with the below
table.
For all B.M.C. units the below configuration is standard:
PIN 1 = GND / Ground
PIN 2 = + / Hot / 0°‐Phase (non‐inverted)
PIN 3 = ‐ / Cold / 180°‐Phase (inverted)
Service
In case you have to contact the B.M.C. service centre, please prepare the following information:
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Model‐name and serial number.
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Date of purchase.
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Name, tel. and address of the dealer.
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Precise description of the malfunction.
Maintainance
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BDCD1 requires no user maintainance.
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Clean the unit with a dry micro‐fiber cloth only.
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Take special care not to scratch the acrylic windows.