Accuphase AD-50 Manuel d'instruction - Page 2

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Accuphase AD-50 Manuel d'instruction
Analog Disc Input Board
Thank you for your purchase of the AD-50 Analog Disc Input Board. This optional board
mounts into the rear panel of your supporting Accuphase device, allowing the unit to connect
to and play from analog disc players.
Operation of this board varies according to the Accuphase device in which it is mounted.
Please refer to the documentation for your Accuphase device before using this board.
Using the AD-50
LEFT and RIGHT analog player input jacks
Connects to the output cables from the analog record player.
GND terminal
Connects to the ground cable from the analog record player.
Before installing the board, set board DIP switches S1to S3 as explained below.
Note: Use a pointed object to set the DIP-switch bits, and be sure that all bits are set correctly. The board may
not function properly if any of the bits are out of position.
ON
Push key down until it
stops.
S1 : MC/MM
❶
Equalizer gain swit
S2 : SUBSONIC FILTER
❷
Subsonic filter ON/OFF
S3 : MC IMPEDANCE
❸
Selects MC input impedance:
30, 100, or 300 ohms.
SI settings are meaningless if you are mounting
the board into a unit that includes an MC/MM
switch on its panel, as the panel setting takes
precedence.
❶ S1: MC/MM － Equalizer gain switch
Illustrations show front view of switch.
MM: Moving-magnet cartridge (high output voltage)
Factory setting
MM
1, 2 : OFF
1
2
ON
MC: Moving-coil cartridge (low output voltage)
1, 2 : ON
MC
1
2
ON
OFF
Push key up until it
stops.
(Illustration shows side view of switch.)
S2
S3
SUBSONIC
MC
FILTER
IMPEDANCE
S1
MC/MM
AD-50 Component Side (DIP-switch locations)
Gain: 40 dB
Input Impedance : 47 kilohms
Gain : 66 dB
Input Impedance : As set by S3.
AD-50
❷S2: SUBSONIC FILTER － Subsonic filter ON/OFF
Illustrations show front view of switch.
Factory setting
OFF
1, 2, 3, 4, 5, 6 : OFF
1
2
3
4
5
6
ON
1, 2, 3, 4, 5, 6 : ON
ON
1
2
3
4
5
6
ON
❸S3: MC IMPEDANCE － Selects the MC input impedance.
Illustrations show front view of switch.
Factory setting
300Ω
1, 2, 3, 4 : OFF
1
2
3
4
ON
1, 2 : ON
100Ω
3, 4 : OFF
1
2
3
4
ON
1, 2 : OFF
30Ω
3, 4 : ON
1
2
3
4
ON
How to install
❶ Turn off the device power.
❷ On the rear panel, remove the sub panel of the slot you
wish to use. (See
)
Fig. 1.
Retain the sub panel for future use.
◆
❸ Insert the option board into the slot, along the slot's
upper and lower guide rails (see
). When the rear
Fig. 2.
of the board reaches the internal connectors, give a
gentle push to snap the connection into place, so that
the front of the board becomes flush with the panel.
❹ Secure the board by screwing in the top and bottom
screws.
Caution
Turn off the device power before installing or removing option boards. Installing a board
●
while power is on may damage the equipment.
Keep fingers out of the opened slot. Do not place anything other than the board into the slot.
●
Avoid touching the board's soldered areas, connector contacts, and components. Touching
●
these areas may damage the circuitry or the contact. Hold the board by the edges or along
its panel.
Tightly screw in the two screws all the way (by hand). If screws are loose, terminals may
●
separate from ground, resulting in poor contact or equipment damage.
Do not use electrical contact enhancers or conductivity agents on input jacks and
●
connectors, as these may cause aging in resin parts and lead to damage.
J171.3X
INSTRUCTION MANUAL
This is a low-cut filter with a cutoff frequency of
25 Hz and a steep attenuation curve (-12 dB/octave).
Its purpose is to filter out very low frequency noise
that might otherwise adversely affect audible ranges.
It is very effective for removing rumble noise from
warped records and for preventing woofers from
bottoming out.
In general, you should set this according to the MC
cartridge's rated internal impedance, as follows.
20 ohms or higher: Set to 100 or 300 ohms.
Below 20 ohms: Set to 30 or 100 ohms.
As a guideline, the impedance setting should be about
●
2 to 3 times the cartridge's internal impedance. But you
should test the setting by ear, and feel free to change it
to get the best sound.
Illustration shows installation on the E-650.
Guide rail
Subpanel
Guide rail
Fig. 1.
ACCUPHASE LABORATORY, INC.
YOKOHAMA, JAPAN
820-3317-00 (B1)
Option
board
Fig. 2.
Printed in Japan