Marantz 2235B User manual

Modef
22358
Stereophonic
IIf.-lIOaIlf-.o Receiver
MARANTZCO..
INC.20525NORDHOFF
STREET,CHATSWORTH,CALIFORNIA
91311
A WHOLLY-OWNEDSUBSIDIARYOFSUPERSCOPEINC..CHATSWORTH.CALIFORNIA
91311

FOREWORD
To obtain
maximum
performance
andenjoyment
from the Model22358Stereo
Receiver,
please
studythese
instr'uctionscarefully.
Installingand
operating
the Model
22358is not complicated,
but the flexibility provided
by its numerous
operating
featuresmerits
yourbecoming
familiar
with its controlsand connections.Our recom-
mended
procedures
will assure
you of securing
the superb
performance
for which the Model
22358was
designed.
Forconvenience, thismanual
isdividedintothree
parts. The first part covers installation.The
second
part outlinesa simplified
operating
pro-
cedure
in a simple,nontechnical
manner.The
thirdpartprovides
amoredetaileddescription
oJ
the featuresof the Model22358.Detailedtech-
nicalspecificationsandfunctionalexplanations
are
includedinthis
part.
For quick identification
of the manycontrols,
connection
facilities,and adjustmentson the
Model22358StereoReceiver,
all referencesto
themin thismanualare
printed
in BoLDFACE
type.
AC Line
Operaticin
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1
AFTERUNPACKING
It is advisableto retain all originalpacking
materialto prevent damageshould
you wish
to
transportor shiptheModel22358
(refer
to page
19for repackingandshippinginstructions),
Be
carefulthatyou
donotinadvertentlythrowaway
orlose
the
partspacked
withtheunit.
Please
inspect
yourStereo
Receivercarefully
for
any signsof shippingdamage.Our very strict
quality
control
and
professionalpride
ensure
that
each Model 22358 left the factory in perJect
condition. lf the unit is damaged
or fails to
operate,immediatelynotify your dealer.
lf the
unit was shippedto you directly,notify the
transportationcompanywithoutdelay.only you,
theconsignee,may institutea claim
againstthe
carrierfor shippingdamage.Savethecartonand
all packing materialasevidenceof damage
for
their inspection.
Shouldassistance
be required,
the MarantzCompanywill cooperate
fully in
assisting
your
claim.
Pleasefill out andmailthe WarrantyRegistration
Card
within ten daysof purchase. Thecard
will
remainon file at the MarantzCompany
for the
durationof thewarranty
period.
Wealso
strongly
advisethat you retain your sales
receiptto
provideproof of purchase
in the eventthat
Warranty
service
issought,
GENERALDESCRIPTI(IN
The Marantz
Model
22358 is anall solid
state
receiverincorporatingthe innovativedesignand
unparalleledtechnologythathave made
Marantz
famous
intheaudiocomponentindustry.
TheModel2235BfeaturesasensitiveFM
tuner,
a
highly selectiveAM tuner, a low distortion
preamplifier
andtwodirect coupled
amplifierson
a singlechassis,
while retaininga flexibility
comparableto thatachieved usingseparatecom-
ponents,
The
FM
tuner
utilizesanFET
frontend,
ceramiclF filters, and a phase
locked loop
multiplexdecoder.The AM tuner features
an
advancedintegratedcircuitand
ceramiclF filters
for highsele9tivityandsensitivity.
Theamplifier
sections
permit
theconneclionoftwostereo
pairs
of loudspeakers,a turntableor recordchanger,
two tape recorders,stereo
headphones,and an
auxiliarv
sourcesuchasanadditional
tuneror a
TV soundsource.
The22358alsofeatures
front
panel
DUBBING
jacks.

TABTE
OFCONTENTS
Preparationfor Use
MechanicalInstallation
MarantzWalnutCabinet
Customlnstallation
ConnectingtheModel22358
RearPanel
Con
nections
Phono
Inputs
Tape
Jacks
AuxInputs
FM
Antenna
AMAntenna
FMOuadradial
OutputJack
Pre
OutandMainInJacks
SpeakerSystems
SpeakerPhasing
Connectionto ACOutlet
ConvenienceOutlets
SimplifiedOperating
Procedures
MainControlsandSwitches
Power
Switch
SelectorSwitch
VolumeControl
EalanceControl
Bass,MidandTreble
Controls
TuningMeters
Gyro-TouchTuningKnob
DolbyFMSwitch
MonoSwitch
FMMutingSwirchand
Muting
LevelControl
Tape1MonitorSwitch
LoudnessSwitch
HiFilter
Switch
Main-Spkr-Remote
Switches
PhonesJack
e
4
4
4
4
4
4
o
t)
7
8
8
8
I
8
I
8
I
o
I
I
o
I
9
10
10
ControlCircuits
Balance
Control
VolumeControl
ToneAmplifier
Output
StageandProtective
Circuits
Specifications
Maintenance
Cleaning
FuseReplacement
lnCaseof Difficulty
Repairs
Repacking
forShipment
tc
15
tc
IJ
15
16
18
18
18
18
18
19
UsingTape
RecorderswithYourModel22358
DubbingJacks
MakingTapeRecordingsandDubs
TapeMonitoring
MakingModifiedTapeRecordings
RecordingDolbyizedFMBroadcasts
TechnicalDescription
General
FMTunerSection
FrontEnd
lF Stages
StereoDemodulator
Muting
Circuit
AMTuner
Section
Preamplif
ierSection
Tape
Signals
Tape
Monitor
Switch
IIST
OF
ITTUSTRATI(INS
1. Rear
Panel
ConnectionFacilities
andAdjustments
2. AM/FMAntennaConnection
3. AM Ferrite-rod Antenna
4. SpeakerSystemConnections
5. Operation
of SpeakerTerminals
6. FrontPanel ControlsandJacks
7. ThreeConductor
PhonePlug
8. Taoe
Recorder
Connections
9. Arrangement
forMakingModified
12
12
12
14
14
14
14
14
14
1A
14
15
15 '10.
11.
TapeCopies
FunctionalBlockDiagram
Packing
Instruotions
4
5
5
o
8
10
11
12
IJ
'to

PREPARATIONF(lB
USE
MECHANICAL INSTALLATION
TheModel 22358StereoReceiver
canbeinstal-
led in two basicwavs: In a beautifulwalnut
veneercabinetfor placement
onatable
or shelf,
or mountedin your own cabinetrvor custom
installation.
MARANTZWALNUT
CABINET
An attractivewalnut veneercabinet,Model
WC-22U,may be obtainedfrom your Marantz
dealer.Thecase
provides
for proper ventilation,
andcanbe
placed
onfurniture,oronabookshelf.
Completeinstructions
for installation are
provid-
edwiththewc-22u.
CUSTOMINSTALLATION
When
planning
a custominstallation,
allowade-
quate
spacingbetweentheModel
22358,cabinet
surfaces,and other componentsfor adequate
ventilation.
To install the Model
22358StereoReceiver
in a
customcabinet,
cut an opening
16-718inches
wideby 5-118inches
high.Sincethefront panel
oJthe Model2235B
islarger
thanthecutout,it
will neatly
hidetheedges
ofthecut.Remove
the
plastic
feetfromthebottomoftheunitandslide
it throughtheopening.
To support
the
weight
of
the Model22358,adequate
bracingacrossthe
rearof the cabinet
mustbe locatedto provide
contactwiththe rear
oftheunit.

Figurel. BeatPanel
Connection
Facilities
andAdiustments
CONNECTING
THEMODET22358
REARPANELCONNECTIONS
Figure1 showsthe locationof inputandoutput
jacks on the rear panel.
These
.jacks
are for
"permanent"
connections.
Front
panel
jacks
and
theirusewill bediscussedlater,All connections
to therear
panel
shouldbemadewiththe
power
to the entire
systemturnedoff. The rear
panel
signalconnections
arearrangedinstereo
pairs.
All
signalconnectionsto theModel 22358,with the
exception
of the FM antennaandloudspeakers,
shouldbe madewith shieldedaudiocables.To
avoidconfusion.connectone cableat a time
betweenthe 22358 and
theothercomoonentsof
your system.
This is the safestway to avoid
cross-connectingchannels
or confusingsignal
sourceoutputs
with inputs.
PHONOINPUTS
The PHONO
jacks
are intended
for usewith
magnetic
phono cartridgesand have
a 47,OAO
ohm
inputimpedance.
lf ahumisheardwhen
playing
records,this
is
an
indicationthat the record
player
or itsconnec-
tionsareinadequately
grounded.
Connecta
sepa-
rateground
wire from the truntableor record
changer
frametotheCHASSISGROUNDbinding
posr
of theModel2235B.lf thisisineffective,try
reversing
the polarityof the turntable's
power
p
lug.
lf hum persists, consulttheinstructionbooklets
for
theturntable
and/or
phono
cartridge.
TAPEJACKS
The rearpanelof the 22358
twotaperecorders. can accommodate
ThetermslN andOUTreferto the input
and
output of the Model
22358.Therefore,
the lN
jacks
ontheModel22358
acceptsignalsfrom
the
line
outputs
of eachtaperecorder;
the
OUT
jacks
feedsignal
tothetaperecorders'
line
inputs.
AUX INPUTS
TheAUX input
jacks
are
formiscellaneous
high
levelsignalsources
such as additional
tuners
and/orreceivers,
tape
players,phonographs
that
provide
RIAA equalizedhigh level
output,TV
sound
outputs
andotherexternal
components.
FM ANTENNA
The bestFM reception
isobtained
with a Log-
Periodic
typeantennamounted
ona
good
quality
rotor system.
For fringeareas,Marantzrecom-
mends
a Log-Periodic
antennawith six or more
elementsdesigned
expresslyfor FMreception.
To
minimizelocalnoiseandmultipath
picked
upby
thelead-inwires,useabalanced
andshielded300
ohmcableor a
coaxial
75
ohmcablewitha
300
to 75ohmmatchingtransformer
at theantenna.
Unshielded
lead-inacts as an omnidirectional
antenna,andcancancelthe directional
benefits
of vour antenna.Low-loss
300 ohm shielded
cableconsistsof two innerconductors
plus
an
outershieldandinsulating
lacket.
Thistype
of
shieldedcableeffectively
prevents
the lead-in
f
romcontributingmultipathdistortion.

For ruralareas,it is recommended
that a local
dealer
be consulted
aboutantenna
installation
andlightning
arrestor
protection.
Masterantenna
systems
arenot recommended
for use with your
Model2235B;suchsystems
areusually
designed
expressly
for television
receptionand
frequently
suppressFMsignals
beforedistribution.
Inaddi-
tion, masterantennasystems
oftenseverely
re-
ducethe
quality
of the
FMsignal.When
outdoor
antennas
are
prohibited
or inconvenient,
place
the
antenna
invacantatticspace
or-useasimple300
ohmTV "rabbitear"antenna
or theribbon-type
foldeddipoleantenna
supplied
withthe Model
22358. Both are practical
and will give satis-
factoryresults
inprimary signalareas.
Your
Model2235B
Receiverwillaccepteither
a
75or 300ohmantenna
(see
diagram,
Figure2).
The300ohmantennacableshould
beconnected
to thetwoterminalsmarked
FMontheANTEN-
NAterminal.Whenusing75
ohm
coaxialantenna
cable,connect
itsshield to the G (G ROUND)
terminal,
and its inneror centerconductorto
eitheroftheFMterminals.
AM ANTENNA
Your Tuner
isequippedwith anAM ferrite-rod
antenna.BEFOREUSINGTHEMODEL22358,
SWING
THE ANTENNA
OUTAS SHOWN
IN
FIGURE3.
The
ferrite-rod
antenna
will giveyousatisfactory
resultsin primary signalareas.
However,an
outdoor
antennawill provide better
receptionin
weakersignalareas.Two single
wires
are
required
to makeanAM outdoorantenna.
First.
connect
Figure2. AM/FMAntennaConnection
one
end
of a single wireto theAMANTENNA
terminalonthe rear
panel,
andtheotherendto a
veryhighhorizontalantennawireof 25
to 75feet
in lengthsuspended
betweeninsulators
in an
outdoorlocation
(the higherthe better).
Next,
connect
the othersinglewire between
the "G"
terminalof your Model22358 andanauthenti-
catedearth
ground
(such
asa metalwater
pipe).
FM OUADRADIALOUTPUT JACK
In anticipationof futurefour channel
quadra-
phonic
broadcasting,
your
Model22358is
equip-
ped
with an FM oUADRADIALOUTPUT
jack.
The
signalavailableatthis
jack
istheunequalized,
bufferedoutDut of the FM discriminator.lts
level,frequency
responsecharacteristics,and
out-
put impedanceareidealto driveafour channel
adaptor.This.iack
can
alsobeusedasa simple
"whitenoise"
generator
forchecking the
response
characteristics
of loudspeakersor amplifiers.For
this
application,
place
theModel 22358
in FM
modewith themutingoff, andtunebetweenFM
stationsto receiveinterstationnoise.
PREOUT AND MAIN IN JACKS
ThePREOUTjacks deliver
the outputof the
Model22358 preamplifier circuits
to the rear
panel.
TheMAINlN
lacks
aretheinputterminals
of the poweramplifiersectionof the Model
22358.fhe PREOUT
and
MAIN lN jacks are
bridgedinternallyby special contactswithinthe
jack assembly.When you wish to use such
equipment
as a graphic equalizer,
compressor/
limiter, or expander,
you may connect
these
instruments
to your Model 22358withappropri-
ate lengthsof shieldedaudiocables. Whenthe
Figure
3. AMFerrite-rodAntenna

external
equipmentis
connected,the
insertion
of
its RCA
phonoplugs
in to the MAIN lN jacks
automaticallybreaks
the internal
connections
to
prevent
theexternal
equipmentfrom
being
bypas-
seo.
SPEAKERSYSTEMS
The
SPEAKERSYSTEMS
terminals
on the
rear
panel can accommodate
two stereo
pairs of
Ioudspeakers.
Connectthemain
pair
totheMAIN
terminals.The REMOTE
terminals
are for a
secondstereo
pair
of loudspeakers
(see
Figure4).
Selection
of loudspeaker
systemsis
madewiththe
MAIN-SPKR-REMOTEpushswitches
onthefronr
paner.
To connectthespeakers
to thelvlodel2235B,
use
ordinary
#18 gauge stranded
two-conductor
lamp
cord.lf thedesired
cordlengthfor
eitherchannel
exceeds
30feet,
use
# 16
gauge
wire
orheavier.
Stripabout1/2-inch
of insulationfrom
eitherend
of both loudspeakercords.
Twistthe strandsof
eachconductorto prevent fraying.
Examine
the
Figure
4, SpeakerSystemConnections
wiresfor polarity
markings
Oneof each
pair
will
probably
bemarkedin anyoneof severalways.
Checkfor a molded
ridgeon the insulation,
a
tracer
thread,orone
ormoretinned
strands.
To assurethebeststereo
separationandfrequen-
cy response,
the speakers
must be properly
phased.
Normally,
thepositive
terminaloneach
speakershouldbe
connectedto itsrespective
(+)
terminal
ontheModel22358,
andthenegative
or
"common" terminal
shouldbeconnectedto its
respective
{-) terminal.
Usethe
polarity
markings
on thewires
to aidin makingidentical
connec-
tionsto each
speaker.lf yourspeakersusescrew
terminals,it is advisable
to attach crimp-on
"spade
lug" terminalconnectors
to the wires
at
theendthatwill be
connectedto the
soeakers.At
theamplifier
end,connectthewires
asshownin
Figure5.
SPEAKER
PHASING
lf the loudspeaker
cords
havenopolaritv
mark-
ings,or if youareotherwise
doubtful
that
vour
speakers
arecorrectly
phased,perform
thefollow-
ingtest
after
you havecompletedyour installa-
tion
and
your
systemisoperating.
o@
-f
frIGhT RIGHT
MAIN
SPEAKER
SYSTTMS REM()TE
SPEAKER
SYSTEMS

1.Complete
the necessary
signalconnections
so
that program material
maybe
played
rhrough
thesDeakers,
2.Placethesoeakers
inthecenter
oftheroom.
3.Depress
the MONO pushswitch
and play a
record
(orradioortape)withstrong
bass
tones
at a low volumelevel,Genter
the BALANCE
control.
4,Positionthe speakers
aboutsix inchesapart,
face-to-tace,Listen,particularly
to the ap-
parent
loudness
ofthebasstones.
5.Next,turn
off all
power,
but
donotdisturb
the
VOLUMEor BALANCEsettings.
Reverse
the
connections
onthe
rightspeakeronly,
Turn
on
the power
andlisten
again.lf the basstones
nowseemlouder
thanin (3),
you
havecorrect-
ed the phasing
between
the speakers.
lf the
bass
notesnow sound
softer,turn off the
power
and
reconnectthespeakers
astheyhad
been
originally.
6, lf an additional
pair
of speakersisconnected,
andif theyare
intendedto beusedin
thesame
room as the main speaRer,
check phasing
betweenthe remotesoeakersand the main
speakers.
Usethe BALANCE
controlto play
only two speakersat once,and invertthe
wiring
ontheremotespeakers
asnecessary.
Do
not change
the connections
on the main
speaker
system.
7.Once
having
phased
allspeakers,
you neednot
repeatthis
procedure
inthefutureif you
now
markthe speaker
connectionsand/orcables.
Any methodof coding
issatisfactory,
provided
it enables
you,in the
future,to duplicate
your
now{orrect hookup between speakers
and
amolifier.
Usecautionwhenconnecting
yourModel22358
to a loudspeakerwith built-in
power
supplysuch
asan electrostaticloudspeaker.The "common"
connection
terminal
of sucha speakermay be
capacitively
coupled
to ground through
itsown
power
supply.
To protect theModel22358
from
distortion
and possible
overload,
makesure
the
Figure
5..0pelationofSpeaker
Terminals
(-) terminalsof theModel22358are
connected
to the
"common"
terminals
of such aloudsoeaker
system,
CAUTION:NEVER DIRECTLY CONNECT
THE LOUDSPEAKER TERMI-
NALS OF ONE CHANNEL IN
PARALLEL WITH THOSE OF
ANY OTHER. ANY RESULTING
DAMAGE IS NOT COVERED
UNDER
WARRANTY.
NOTE: Do not use4 ohm speakers if main
and remotespeakersareto beused
simultaneously,UseI or 16 ohm
speakersonly.
CONNECTIONTO AC OUTLET
Withthe front panel POWER
pushswitch
"out".
plug the line cord into an electrical
outlet
supplyingthe
proper
voltage.
CAUTION:Do not exceedthe maximum
total
power
ratingsof theACoutlets.
The
POWER
switch
andothercircuitry in
the 2235tJ may suffer damageif
forcedto conduct
excessivecurrent.
CONVENIENCEOUTLETS
One UNSWITCHEDand one SWITGHED
AC
OUTLETSare provided on the rear
panel
for
powering
associatedcomponentsof yout system
(tape
recorder,record
player,
etc.).

t
e
ir,9.-"
-I'
"g'
c
r
It:
Figure
6. FrontPanel ControlsandJacks
PROCEDURES
POWER
SWITCH
ThePOWERswitch,whendepressed,suppliesAC
power to the Model 22358 and to the
SWITCHEDoutletonitsrear
panel.
SELECTORSWITCH
The SELECTORswitch selectsthe program
source
for listeningorrecording.
VOLUMECONTROL
TheVOLUMEcontroladjuststhe levelof both
outputchannelssimultaneously
while
maintaining
stereobalance
at allnormalsettings.lt doesnot
effectthe
recordingoutputs.
BALANCECONTROL
This control alters
the levelof eitheroutput
channel
in situationswhere it is necessarvto
correct unbalanced
programs
sometimesen-
countered
in olderstereorecordingsor in stereo
broadcasts.As it is moved from its center
position,
it decreasesthe levelin one output
channel
whilemaintainingthelevelintheother
channel.
BASS,MID AND TREBLECONTROLS
Thesecontrolsare usedto adiustthe tonal
balanceof prograr.n materialto suit individual
listening
preferencel
SIMPTIFIEDOPERATING MAIN
CONTRIITS
AND
SWITCHES
Whenoperating
theModel22358
StereoReceiver
for thefirsttime,followthese
simpledirections.
Later,full advantage
canbetakenof irsversatility
withtheremaining
controlsand
pushswitches.
Step1. Connect the FM anrenna
to the appro-
priate
terminalsontherear
panel.
Step2. Connectthe speakers
to the MAIN
speakertermina
l.
Step
3. Placeall pushswitches
in the "out"
position.
Step4. Turnthe VOLUME
controlallthe
wav
to the left (cou
nterclockwise)
and set
the BALANCE
control in center
oosi-
tion.
Step5. Rotate
TREBLE,
MID andBASS
con-
trolsto the 12 o'clock
position(each
pair
ofpointers todot).
Step6. DepresstheMAIN
SPKR
pushswitch.
Step
7. PlugtheModel
22358into
anACwall
outlet.
Apply system
power
by depress-
ingthePOWER
switch.
Step
8. Selectthe desired
program
sourceby
settingthe SELECTORswitchto rhe
appropriate
position.
lf FM or AM is
selected,rotate the GYRO-TOUCH
TUNINGknob
untilthedesiredstation
is
tuned.
Step9. Adjust
the VOLUME
controlto acom-
fortable
listening
level.
Thefollowingsection
will explaintheremainder
of the front panel controls.The
controlswill be
discussed
in orderof usagewith the mostcom-
monlyusedcontrols
discussedfirst.