KRELL MD-2
m
m
m
m
m
m
mm
m
mm
mmm
mm
m
m
mm
mmmm
COMPACTDISC TURNTABLE
OWNER’S REFERENCE
A. INTRODUCTION
Welcometo the Krell family of audio components. You
have joined a select gro.up of discriminating listeners who
enjoy the finest in music reproduction.
Krell Digital (KDI) is dedicated to the development
technologically advanced components for the reproduction of dlgita.lly recorded music. These designs continue
the Krell tradition of ~ncompromisingperf6rmance
through leading-edge technology.
This Owner’sReference is divided into several sections,
each designed to perform a different function. A Question
and Answer section is also included where answers to
commonquestions are provided. Should you have any
questions or suggestionsplease feel free to contact your
authorized dealer or the KRELL
staff for assistance.
In the unlikely event that your MD-2should require
service you will be pleased to knowthat it is backed by a
c.omprehensive Customer Satisfaction policy and one of
the most advancedservice facilities in the industry. For
detailed information on the terms and conditions of
service please consult y_our wa.rranty registration card or
your au~orized KREELDistributor.
B. TABLE OF,CONTENTS
2 UNPACKINGAND ASSEMBLY
3 DUST COVERINSTALLATION
4 BASIC INSTALLATIONAND CONNECTIONS
5 OPERATIONOF THE CD TRANSPORT
6 REMOTE CONTROL
6 CARE AND CLEANING
7 QUESTIONS AND ANSWERS
9
SPECIFICATIONS
AND SERVICE INFORMATION
13 WARRANTY
C. UNPACKING AND ASSEMBLY
1. Openthe box and removethe top layer of protective
foam. Thefollowing items will nowbe visibIe:
1 Dust Coverencased in a protective sleeve
1 CDStabilizer
1 AC power cord
1 MD-2RC Remote Control
3 AAABatteries for MD-2RC
1 Packet containing the OwnersReference and
Note:
warranty
If anycard
of these items are not included[?lease
con.tact your authorized dealer immediatelyfor
assistance.
2. Removethe layer of foamcontaining these items and
set it aside for later use. Carefully removethe MD-2
transport from its box and removethe protective plastic
wrap.
Note: Save all packing materials. If you must ship your
MD-2
in the future repackthe unit in its original pa, ckaging to preventtransit damage.If the unit is returnecl to
KRELL
for service please send the cover and the remote
control unit.
Caution: If your MD-2has the customlucite cover do not
removeit fiom its protective sleeve at this time! This
cover is extremely_delicate and can be. permanently
scarred if mishandled.Please follow the instructions
providedin this Referencefor safe installation.
3. Removethe transport screws from the bottom of the
unit. Their locations are markedwith stickers on the
bottomof the chassis.
NOTE:Later pro,duction modelshave a protective plastic
hub that secures the transport fromthe top of the unit
during shipping instead ot transport screws. Carefully
removethe-black plastic hub by tu~ing it counterclock4, Remove
the voltage identification sticker from the
back of the unit. Youare nowready to install the dust
cover.
2
CAUTION: FAILURE TO REMOVETRANSPORT
SCREWS BEFORE OPERATION COULD RESULT IN
DAMAGETO THE TRANSPORT.
CAUTION: FAILURE TO REMOVETHE PROTECTIVE HUB BEFORETHE UNIT IS PLUGGEDINTO
THE AC RECEPTACLE OR BEFORE OPERATION
COULD RESULT IN,DAMAGE TO THE TRANSPORT.
~
D. DUST COVER INSTALLATION
1. Standard Version SmokedDust Cover:
Remove
the dust cover, in its protective sleeve, fromthe
shipping foam. To prevent scratching leave the protective
sleeve on the dust cover until the cover mountingis
complet.e. Thereare two pairs of screws w.ith wasOer-type
receptacles attached to the back panel of the unit tor
mountingthe dust cover. Center the hinge pins on the
dust cover over the two pairs of screws. Carefully slide
the hinges into the slots Formedby the washers. Pushthe
cover downevenly on both sides until it is fully seated.
Finally, removethe protective sleeve.
2. CustomVersion Clear Lucite Dust Cover:
Removethe dust cover from the protective foamand its
protective sleeve. Thereare two pairs of screws with
washer-typehinge receptacles on the back. of the un!t.
Remove
the four screwgfrom the unit ancl take off the
black hinge receptacles. Carefully place the lucite dust
cover such that the circular milled-out portion,is centered
over the transport. Alignthe slots in the cover s hinge
blocks with ttie holes in the back of the chassis. Thread
the four screws into the chassis through the hinge blocks.
Tightendownlightly and adjust the cover so it is ce.ntered on the unit. Oncethe cover is aligned tighten clown
the supporting screws.
NOTE:The clear lucite cover must be lowered manually,
as it is very heavy and does not have a damping
mechanism.
E. BASIC INSTALLATION AND
CONNECTIONS
1. Place the unit on a clean level surface awayfrom
excessive heat, moisture or light. Ideally, the-MD-2
should be placed on the top of an audio componentcabinet or other "openair" rigid platform.
2. The MD-2maybe placed in a cabinet. It will require.
17.0 inches of verticaIclearance betweenthe bottom and
top shelves for proper operation of the cover.
3. If space is limited the MD-2can be operated without
its dust cover. Six inches vertical clearanceis adequateto
allow convenientaccess to the disc transport area.
4. Thelocation of the unit should be within 2 meters of
the digital signal processor. If longer distance is required,
we recommend
using a fibre optic data link as it is more
suited to long distance runs.
5. Connectthe ACpowercord to the back of the unit.
Oncethe powercord is secured, plug the cord into an AC
outlet.
Whenthe MD-2is connected to the ACoutlet you will
hear a soft clicking soundand the display on the front
will showtwo illuminated dashes. This puts the unit in a
standby condition.
NOTE:While the MD-2has superb regulation and does
not require a dedicated ACcircuit, we strongly advise
against any connections through extension cords or multiple ACadaptors. High quality 15 ampgrounded AC
strips are acceptable.
6. Connectthe Digital Output from the MD-2to a Krell
Digital Processor or other compatibledigital-to-analog
audio processor. The MD-2is compatible with both
industry standard Fibre Optic or Coaxial cable connectors.
~’/i
Care should be taken in selecting th~ type of cable used
to link the MD-2
to your processor. If coaxial cable is to
be used it should be 75o1~m,non-capacitive, with a bandwidth in excess of 10 MHzto prevent dropout errors.
CAUTION:
The MD-2is a CDTransport only. It is not
designed to connect directly to any preampor analog
signal processor.
4
F.
TRANSPORT OPERATION
Turn the CDtransport On by pressing the POWER
~.utton.
Select a disc and place it on the spindle, label side
~ujg. Put the disc stabilizer on the center of the CDso it
fits securelyon the drive spindle.
CAUTIONS:
a. Neveroperate the .CD. transport withoutthe disc stabilizer. This can result in damageto the transport or your
valuable compactdiscs.
b. Neverplace the disc stabilizer wherethe cover may
accidentally close on it and be damaged.
c. Donot use any disc stabilizing tool besides the KDI
CDStabilizer. This device has been specially machin.ed
to precisely matchthe CDtransport. Failure to heed tlais
warningmaycause damageto the laser transport.
2. Thefunctions of the front panel buttons that control
the transport are described below.
DISPLAY Changesbetween track designation and
elapsed time
POWER Turns unit ONor OFF
STOP
sStops
the disc
discplaying
fromplaying
PLAY
tarts the
at track. 1; will also
restart play of t-he current track
Reversetrack select
Forwardtrack select
Fast reverse scan
Fast forward scan
G.
REMOTE CONTROL
1. The operating functions of the RemoteControl are
describei:l below:
PAUSE
STOP
PLAY
Temporarilystops the musicat a specific
point; Pr.essing again resumesplay from the
samepoint.
S~topsthe disc from playing
:starts the disc playingat track 1; will also
restart play of t-he current track
Reversetrack select
Forwardtrack select
Fast reverse scan
Fast forward scan
2. Battery installation:
Removethe two hex hea,d, screws from the bottomportion of the remotecontrol s front plate. Remove
the small
top plate to exposethe battery storage compartment.
Ref6r to the polarity drawingwhile inserting the batteries. Replacethe top plate and insert the two hex head
screws.
H. CARE AND CLEANING
CAUTION:
Please read this section carefully to prevent
damagethrough improper cleaning methods or materials.
1. Dueto the exposednature of the laser transport assembly on the MD-2extracare should be taken to insure that
it is not accidentally contaminatedwith finge~rints,
cleaning liquids, etc. Duringday-to-dayuse the laser will
not becomedirty or contaminatedany faster than an
enclosed transport. However,the laser should be cleaned
at least twice annually to removeresidue from smokeand
airborneoils.
To clean the laser lens: place a drop 0f CDcleaning fluid
on a clean, lint free cloth and eng_cN~
wipethe lens clean.
6
Cautions:
a. Donot oil the laser transport! This mechanism
is comple.tely self-contained and does not require customer
maintenance.
b. Donot touch any part of the exposedlaser and servo ’
system with your hands. This could accidentally damage
tile drive unit ......
2. To removefinger ~arks and small scratches from the
dust cover we recommend
a light hand glaze which is
specifically designedfor plastics and painted surfaces. At
Krell we use a product from 3Mcalle~l "Imperial Hand
Glaze". Its part numberis 05990. Followthe
manufacturer’sdirections.
3. Should deeper scratches need to be removedwe recommend
a light or,,medium-dutyplastic polis,h such as
"Plastic Polish #2 . Followthe manufacturers directions
and use the light 3Mtype glaze to removeany swirl
marks. These cleaning products maybe found in quality
automotivebodyor detailing shops.
I. QUESTIONS AND ANSWERS
Q. Myanalog-to-digital processor will accommodate
either fibre optic or coaxial digital inputs. Whichoutput
should I use on the MD-2?
A. Whilea high quality coaxial willperform quite well,
werecommend
glass fibre optic cable due to its ability to
completely isolate the grounding planes betweenthe
transport and processor, and its resistance to RFinterference.
Q. I have installed the MD-2
but the disc will not turn
whenI press PLAY.Whatshould I do?
A. Checkto see if you removedthe transport screws from
the bottom of the unit as stated in the UNPACKING
ANDASSEMBLY
section of this manual.
Caution: Shouldthis not be the cause of your difficulty.
do not attempt any repai.r of this unit. Contactyour authorized Krell Dealei/Distributor or the factory.
7
Do you recommendI leave the MD-2ONat all times?
QAI
Yes. These circuits are most accurate and stable when
left to idle whilenot in use. In fact, discrete parts age
faster when cycled ONand OFF. The MD-2will sound
better and last longer if left ON.
NOTE:Youshould disconnect the ACcord from the wall
outlet before any electrical storms or if youplan to be
away from your homefor prolonged periods of time.
~Willthe MD-2
play if the dust cover is fully raised?
AQI
Certainly. Theunit will function perfectly even with
the dust cover removed.
Q. Dueto the exposednature of the laser assemblyis
there a possibility of damagethrough laser radiation?
A. No. There is an optical sensor under the CDwhenit is
positioned on the transport hub. This allows the MD-2to
prohibit the laser fromturning on whenit is not covered
with a CD.
IQ.
own
many
CD’s
which
Rings on them. Am
ableI to
use
these
discs
withhave
the CD
MD-2?
A. Yes, the MD-2will accept discs with "CDRings".
_D.ueto their very low massthey will not damagethe MD2’s transport. Whilewe can neither affirm or deny the
benefits derived from the use of CDRings, we do not
feel that any type of disc equilibriumdevice is required
with the MD-2when properly used with our CDStabilizer
Caution: Westrongly_ advise against the use of any type
of additional disc stabilizer. Theseitems add too much
massto the laser servo system and mayburn out the
drive.
Q. Do you recommendthe use of "Cones" or other damping feet with the MD-2?
A. Dueto the extraordinary rigidity of our machiningand
internal dampingwe do not feel that the MD-2requires
additional masscoupling or isolation. If you wish to use
an after-market isolation device yo~ maydo so without
fear of dam. agingthe MD-2.Anydevice whichaffi.xes
permanentlyto the chassis or requires a breach of the
external chassis will void the warranty.
Q. Can I use both sets of COAXIAL
outputs at the same
time?
A. Yes, the MD-2can drive two different digital to analog converters.
Q. Will the MD-2play CDsingles?
A. Yes, the MD-2willplay CDsingles.
¯ I. SPECIFICATIONS
TRANSPORT
Philips CDM-1 MK11 with Hall effect motor, swing-arm
design in a unicast frame.
LASER
Single Beamwith glass lens
OUTPUT
Digital only in industry standard formats
1 FIBREOPTICvia standard interface
2 COAXIALvia RCAconnectors
REMOTE CONTROL
Wireless infrared
DIMENSIONS
1,9," wide, 12.5" deep
6 ,,high, cover closed
15 tilgh with cover open
WEIGHT
23 pounds, unit only
28 pounds, shipping weight
9
INSTALLATION
O
MD-~
OF THE CUSTOM ACRYLIC
KRELL
DIGITAL
INC,
TOPCOVER FOR MD-2
l
2
T-BLOW
l. Toremovemoldedcover, slide the cover assemblyupwarduntil the hingesare cleared fromboth sets of
screws and washers.
2. Besure to saveall the screwsandwashersafter disassembly.
-CUSTOM ACRYLIC
~-2
KRE/&DIGITAL/NC
2
I
COVE~
FAST-BLOw
1, Remove
the four original hingeretaining screwsfromthe backof the unit.
2. Remove
the three washersfromeach screw.
3, Gent/yplace acrylic coveron the chassis top, centerthe hingesto matchthe holesin the chassis.
4. Insert the four screwswithoutwashersinto the hingeandfasten Ioosely.
5. Centerthe coverwith the chassis andsecure hingeblockscrews.
MARCH
1, 1991
K. WARRANTY,AND SERVICE
INFORMATION
There are no user-serviceable parts inside the MD-2.The
MD-2has a limited warranty of three years parts and
labo.r on transport-related parts, five years parts and labor
on electronic parts. Returnfreight is ~ncluc[edin the
warranty. The warranty period begins on the date of
p_u.rchaseand is activated with the return of the enclosed
warranty Card and a copy of the Sales receipt. Please
return the warrantycarol immediatelyafter successful
installation and operation are completed.
The warranty for Krell products is valid ~ in the country to whichthey were originally shipped and at the
factory. If you think there are problemswith your unit
please contact your dealer, distributor or the factory
~mmediately.
Please do not return any unit to KRELL
for repair without first calling to discuss the problemand to obtain a
Return Authorization number.-Freightto the factory or
distributor is your responsibility. Returnfreight to you
will be paid by the factory or d~stributor.
13
1 KRELL DIGITAL
INC.
35 HIGGINS DRIVE MILFORDCT 06460
SALES203-874-3139 FAX203-878-8373
COPYRIGHT1991 KRELLDIGITAL INC.
(MD29105)