Marantz SUPERSCOPE CD-320 - 1.6 Four-Way Power Supply; 3. Test Equipment Required for Servicing Replacement

cD-320
I. FEATUEES
1.1 Fully Selèctâble
Automrtic
Rêcord LeYel and
P..k
Limitêr
According to
program
source, thrèe
relections are
posrible
ABL. LIMITER and
MANUAL.
1.2 Ons.Toùch
Rocordine
The tâpe recorde.
can be set 10 the recording
mode
jusl
by
prersing
rhe
REC button. Thero ir
no need
to
pres.
1.3 Auromatic Tor.l M.ch.ni3m Shut Oft
When the tâpe comes 10 the end
in
any of the
play-
bâck, record, fart
foward
and
rewind modes
ot opera.
rion, the Îâpe tension conlrolled auto.rlopper actuales
to âulomaticâlly release the
locked
pushbutton.
ll
takes 2 to 6 seconds to
rel€ase
lh€
pushbutton
afi€r
the tape
is woùnd up: .ote
that the
inte.val becomes
longer with decreale ol the
power
line voltage. Locked
PAUSE
pushbunon prevents
operâlion ol the âuÎo'
!.4
Du.l
Flywh..l Mcchâniim
Applying
two
flywheels turning round opposirely to
èach
othe.. the
sùength câusêd by wobble or oihe6 k
caôceled each other. ând stable
performance
ol tly-
wheel
rotation ir
always a$ured.
1.5
Cue and R.ri€w
Pulhbunoni
By depressing th€ CUE
or REVIEW
pushbutton,
the
tape can be
fast loruârd or rewind while
monitoring
recorded sound. this feâture
is very convenieni for
easy relerence and
indexing
o.
repeared
plâyback.
8y
dep.esting th€ CUÊ or
REVIÊW
pushbutton
with
thë
PLAY
pushbunon
leaving depressed, the
pinch
roller
s separated
from the câprtan, allowing
the tape to be
1.6 Fourwây Power Supply
The Nlodel CD320 can be operated
by four
power
sources: dry cells
{Ul
1 x 4), AC
power
line, external
DC
powe,
supply
(DCA-6,
sold sepa.ately) ând re-
cha.seâble bâttery
back
{BBD.1,
sold separaielv}. To
prevent
the
possibility
of b€ing overloâded by two or
more
power
sources,
the contacts of rhe AC
jack
(J001)
and
external OC
jack
(J0021
aulomaticallv
select
only one
power
supply
in
the
following
pri-
oriry: 1. AC
powe.
line;2.
externâl
DC
powersupply;
3. dry baneries
lrechargeable
battery
pack).
Thanks
10
irs
builr.i.
rechârge circuit.
even when not operated,
the
Model CD'320 can
recharge
lhe
r€charseable
battery
pâck
as
long
as
ir is coôôected to AC
power
line or erternâl DC
power
supply.
2. SERVICE
ItloTE
As can be seen
trom the circuit
diagram, the chassÈ ol
lVodel CD.320
consis$ of
followins uni$. Each
unil
mounæd on a
printêd
circuit board
is
dêscrib€d
wilh
the
square enclosed by
bold dotted
line
on
the circuit
Pr..Aûp,
Pomr Suptly. Swilch,
Inpurs.t cr, Dolby
. , . , . muri.d
ôn
P.w. Bqtd PIOO
T.rmin.r. .,....
.
Éùnt.d on
P w. aotd
Psoo
Pù.r
S.hr lN
V.6ion)
. . . m(trd
on?lry.so.td
PaOO
Mic.Arr.......
. ..
mùn..d on
P.w. Bo.rd
?700
H..dphom ...,..,....
moù.r..|on
P.$r. Bo.d PAdt
a.chùr..bl. ,......,,.
munr..l o.
P.W. B*d Paor
Fù-
IUC
v..rionl ,..,..
m(nnd
d P.W. aryd
Pgdt
3. TESI
EOUIPMEI{T REOUIRED
FOB SE8VICIIIG
BEPLACEMEI{T
For
measuring checking the
lvlodel
CD.320,
the follow_
ing inrtruments and
mat€rialr
are
necessâry,
.Audio
Oscillator
{af
OSC)
.Artenuator
(600
o)
.Wow
ând
Flutt€r Mete.
.Torque
Meter
(Cassette
Type)
.Digital
F.equency Countèr
.Blânk
Tap€
(Completely
eraeed
wirh bulk eraser)
TDK AC'2ll
{Normâll
TOK AC-511
(CrOr)
SONY
CS.30
(Fe.C')
NOTE:
lf any doubt
k noted
in
a
measured
varue, useg
new lôPe,
.Test
Îâp€s
{New
Tape}
IVTT.l1l
Wôw and Flutter,
Tape Speed
MTT.112
Measurem€nt ol
Output Level,
Signal.lo_Noise
Râtio
lVTT.l50
Adiusthênt
ol Output Level
'
l\4IT.1l6U
FrequencY
Besponse
(for
Normal)
Frequency
Bespons€
(for
CrO,,
Fe.Crl
tvTT,1l6K
-
MTT.l21
Cross
Talk
MTT
141 Channel
S€Paration
MTT-I
l5C
Playback EO, Azimuth
S|AS and EO
swirches tetting
i,r âccordance
with lâpe
aiâ3 EO
120!s
CrOl High 70/$
Fe-Cr 7olrs
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