Marantz SUPERSCOPE CD-320 Mounting instructions

SUPERSCOPE.
BY Rane Been ue iz ©
SUPERSCOPE INC.
20525 NORDHOFF STREET CHATSWORTH,
CALIFORNIA 91311-U.S.A
ee ee ee ee ee
CD-320
SUPERSCOPE DESIGN AND SERVICE
Using
superior
design
and
selected
high
grade
components,
SUPERSCOPE
has
created
the
ultimate
in
stereo
sound.
Only
original
SUPERSCOPE
parts
can
insure
that
your
SUPERSCOPE
product
will
continue
to
perform
to
the
specifications
for
which
it is
famous.
Parts
for
your
SUPERCOPE
stereo
are
generally
available
within
72
hours
throughout
the
nation
via
a
toll-free
line
to
our
National
Parts
Depot
in
California.
The
sales
professionals
who
take
your
call
immediately
refer
to
their
own
desk
top
com-
puter
terminal
and
can
quickly
determine
the
availability
and
price
information
you
require.
If
for
some
reason,
your
order
should
exceed
our
available
stock,
we
usually
can
instantly
provide
an
alternate
replacement
part
or
current
delivery
infor-
mation.
When
the
order
is
placed
and
confirmed,
the
computer
simultaneously
generates
‘‘hard
copy”
orders
at
the
distribution
center.
As
hard
copies
come
directly
from
the
computer
to
the
national
parts
depot,
your
requested
stock
is
assembled
and
prepared
for
shipment
and
placed
on
the
first
available
carrier
for
delivery
to
you.
ORDERING PARTS
Phone
orders
will
eliminate
mail
delays,
and
we
encourage
the
use
of
this
method.
If
you
order
by
mail,
use
SUPERSCOPE
parts
order
forms
which
are
available
from
our
National
Parts
Depot
located
at
the
following
address:
SUPERSCOPE NATIONAL PARTS DEPARTMENT
20525 Nordhoff Street
Chatsworth, California 91311
Phone: [phone]
1-213-998-9333
The
following
information
must
be
supplied
to
eliminate
delays
in
processing
your
order:
. Complete address.
. Complete part numbers.
. Complete description of parts.
. Model number for which part is required (indicate SUPERSCOPE).
. Account number (for account customers only).
ahwohrhd—
Direct
consumers
will
be
provided
with
the
current
retail
prive
quotation
on
available
parts
in
order
to
advise
them
of
the
cost
of
the
parts
and
shipping.
OVERSEAS PARTS ORDERING
Parts may also be ordered from the following overseas addresses:
CANADA
AUSTRALIA
JAPAN
Superscope
Canada,
Ltd.
Superscope
(Australasia)
Pty.,
Ltd.
Marantz
Japan,
Inc.
3710
Nashua
Drive
32
Cross
Street
(P.O.
Box
604)
3622
Kamitsuruma
Mississauga
Brookvale
2100
N.S.W.
Sagamihara
Shi
Ontario,
Canada
L4V1M5
Australia
Kanagawa,
Japan
EUROPE
Superscope
Europe,
S.A.
Marantz
France
Marantz
Audio
U.K.
Ltd.
Superscope
GmbH
Avenue
Leopold
111,
2
Rue
Louis
Armand
9
London
Road,
203
Max-Planck-Strasse
22
7120
Peronnes-Lez-Binche
92600
Asnieres
Staines
D-6072
Dreieich
1
Belgium
Hauts-de-Seine
Middlesex
West
Germany
France England
All
of
the
above
locations
are
fully
equipped
to
take
care
of
your
total
service
needs.
Because
various
countries
have
differing
configuration
requirements,
it
is
necessary
that
you
contact
the
service
facility
in
your
particular
country.
In
the
event
that
there
is
no
service
location
listed
for
your
country,
please
contact
the
nearest
facility
for
the
necessary
assistance.
SUPERSCOPE..
BY wee Breese we Ew. ©

Cd-320 CD-320
mounted on a printed circuit board is described with
the square enclosed by bold dotted line on the circuit
TABLE OF CONTENTS 1. FEATURES
Block Diagram
= SO©HNDAAWNR
—_— =
Level Diagram 2.2... ee es
Schematic Diagram... 1... ee ee ees
Circuit Board Diagram «1... ee ee es
Exploded View and Parts List .............0005
Electrical Parts List 2.2... 00. cee ee ee es
SPECIFICATIONS
GENERAL
Dimensions (W x H x D) 29.3 x 8.2 x 19.5cm
(115/s x 3% x 7% inches)
3.6 kg (7 |b 15 oz) with batteries
3.2 kg (6 Ib 10 oz) without batteries
Power Requirements
Four UM-1, ‘’D’’ size flashlight batteries
(Rechargeable pack: Model RBD-1)
AC: For Europe .... 220/110 V, 50 Hz, 13W
For USA & Canada 120 V, 60 Hz, 13 W
Number of Semiconductors
Transistor
Terminals
Input: Microphone
(one for each channel)
Plug Type ..
Input Sensitivity
Impedance
Line (Aux)
(one for each channel)
RCA Pin
Input Sensitivity
Impedance
Output: Line
(one for each channel)
Plug Type
Output Level
Impedance
DIN (Rec./Play)
Plug Type
Input Sensitivity
Input impedance
Output Level 800 mV at +1.9 VU
Output Impedance
(one for each channel)
Plug Type
Power Output
Stereo Headphone
Plug Type
Impedance
AC Inlet
TAPE RECORDING SECTION
PHI LIPS Type Compact Cassette Tape
Recording System . Quarter track stereo, AC Bias
Erasing System Half track, AC Erase
Rewind & Fast Forward Time 110 sec/C-60
Number & Type of Motor One DC servo
The tape recorder can be set to the recording mode just
by pressing the REC button. There is no need to press
the PLAY button.
1.3 Automatic Total Mechanism Shut Off
When the tape comes to the end in any of the play-
back, record, fast foward and rewind modes of opera-
tion, the tape tension-controlled auto-stopper actuates
to automatically release the locked pushbutton. It
takes 2 to 6 seconds to release the pushbutton after
the tape is wound up; note that the interval becomes
longer with decrease of the power line voltage. Locked
PAUSE pushbutton prevents operation of the auto-
stopper.
1.4 Dual Flywheel Mechanism
Applying two flywheels turning round oppositely to
each other, the strength caused by wobble or others is
canceled each other, and stable performance of fly-
wheel rotation is always assured.
1.5 Cue and Review Pushbuttons
By depressing the CUE or REVIEW pushbutton, the
tape can be fast forward or rewind while monitoring
recorded sound. This feature is very convenient for
easy reference and indexing or repeated playback. By
depressing the CUE or REVIEW pushbutton with the
PLAY pushbutton leaving depressed, the pinch roller
is separated from the capstan, allowing the tape to be
run at a high speed.
1.6 Four-Way Power Supply
The Model CD-320 can be operated by four power
sources: dry cells (UM-1 x 4), AC power line, external
DC power supply (DCA-6, sold separately) and re-
chargeable battery back (RBD-1, sold separately). To
prevent the possibility of being overloaded by two or
more power sources, the contacts of the AC jack
(JOO1) and external DC jack (JO002) automatically
select only one power supply in the following pri-
ority: 1. AC power line; 2. external DC power supply;
3. dry batteries (rechargeable battery pack). Thanks
to its built-in recharge circuit, even when not operated,
the Model CD-320 can recharge the rechargeable
battery pack as long as it is connected to AC power
line or external DC power supply.
2. SERVICE NOTE
As can be seen from the circuit diagram, the chassis of
Model CD-320 consists of following units. Each unit
1.1 Fully Selectable Automatic Record Level and Peak diagram.
whe si te ha eh aioe AES Le tle Mt a aE can Limiter Pre-Amp, Power Supply, Switch,
Features:
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According
to
program
source,
three
selections
are
erimlngle~
ooo.
orisha
ables
mounted
on
P.W.
Board
P500
Test
Equipment
Required
for
Servicing
Replacement
...
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eee
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—
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LIMITER
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P.WVV.
Goar
Bottom
Case
Cover
and
Chassis
Disassembling
Procedures
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Adjustment
and
Measurement
(Audio)
Instructions
2.6...
26...
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9
Rechargeable
..........
mounted
on
P.W.
Board
P801
Fuse (UC Version) ....... mounted on P.W. Board P900
3. TEST EQUIPMENT REQUIRED FOR SERVICING
REPLACEMENT
For measuring checking the Model CD-320, the follow-
ing instruments and materials are necessary.
@ Audio Oscillator (af OSC)
@Attenuator (600 22)
eVTVM
@ Distortion Meter
© Oscilloscope
©@ Bandpass Filter
@Wow and Flutter Meter
@ Torque Meter (Cassette Type}
@ Digital Frequency Counter
@Blank Tape (Completely erased with bulk eraser)
TDK AC-211 (Normal)
TDK AC-511 (CrO2)
SONY CS-30 (Fe-Cr}
NOTE: {f any doubt is noted in a measured
value, used new tape.
®Test Tapes (New Tape)
MTT-111 Wow and Flutter, Tape Speed
MTT-112 Measurement of Output Level,
Signal-to-Noise Ratio
MTT-150 Adjustment of Output Level |
MTT-116U Frequency Response (for Normal)
MTT-116K Frequency Response (for CrO2,
Fe-Cr}
MTT-121 Cross Talk
MTT-141 Channel Separation
MTT-115C Playback EQ, Azimuth
BIAS and EQ switches setting in accordance with tape
used are as follows:
Bias
Normal Low
CrO2 High
Fe-Cr
a Low

CD-320
4. BOTTOM CASE COVER AND CHASSIS
DISASSEMBLING PROCEDURES
4-3 Removing Top Case
Remove three screws 1 to 3. Pull the top case in the
direction of an arrow, and it will be removed. At
that time, remove the connection wire (soldered)
of the speaker.
4-1 Removing Cassette Cover
Pull the cover pushing A and B in the direction of an
arrow. Then the cover will be removed.
4-4 Removing Front Case
Remove the dials A and B and remove four knobs.
Remove four screws 1 to 4 from the sides. Remove
the front case in the direction of an arrow. At that
time, it is recommended to lower the control buttons
before the front case is removed since it is difficult
to remove it due to catching of it by the control
buttons.
4-2 Removing Rear Cover
Remove six screws 1 to 6 at the rear. Remove screws 7
and 8 at the bottom. Pull the rear cover in the direc-
tion of an arrow, and it will be removed.

CD-320
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Remove four screws 1 and then remove nuts A and
B. Remove screws 2 to 4 from the PW board. Remove
the PW board in the direction of an arrow.
4-5 Removing PW Board
a
ke

5. ADJUSTMENT AND MEASUREMENT (AUDIO)
INSTRUCTIONS
Precautions: Prior to any adjustment or measurement,
clean the head slits with gauze containing alcohol or
5-A MECHANICAL ADJUSTMENTS
carbon tetrachloride, and fully demagnetize the heads,
capstan and similar parts.
5A-1 Play Operation Check
(1) Timing Check
®Depress button PLAY, and check to make sure that
the take-up reel rotates first and then that the pinch
roller rotates. Simultaneous rotation of these reel
and roller is not acceptable.
NOTE: For this check, slowly depress the button
without tape mounted regardless of locking condi-
tion.
@Slowly depress button PLAY, and the take-up reel
will start rotation. At that time, check to make sure
that a clearance between the pinch roller and capstan
is less than 0.5 mm.
CAPSTAN SHAFT
, te
PINCH ROLLER
Ny
\\HEAD CHASSIS STOPPER
(2) Timing Adjustment
If out of specification, bend the part of the pinch roller
bracket which faces the head chassis stopper. {n the
figure shown above, bend the part in the direction of A
to decrease the clearance. To increase the clearance,
bend the part in the direction of B.
NOTE: After adjustment, check to be sure that the
pinch roller bracket does not contact the head chassis
stopper in PLAY mode.
5A-2 Pause Timing
Depress button PLAY, slowly depress button PAUSE,
and the take-up reel will pause. At that time, check
to ensure that a clearance between the pinch roller
and capstan ranges from 0.2 to 0.5 mm. If out of
the range, adjust a bending angle of the pinch roller
bracket arm (view A).
NOTE: To increase a clearance between the pinch
roller and capstan, decrease the angle (in the direction
of C in the figure). To decrease the cleanrace, increase
the angle (in the direction of B).
5A-3 Torque Adjustment (FF, REW)
Set the extended parts (B in the figure shown above)
of the torque adjustment leaf spring (A in the figure)
of the FF/REW idler on any one of three stepping
parts of the idler.
NOTE: To increase torque, set the extended parts to
the stepping part of ‘‘INCREASE”’ and to decrease it,
set those to the stepping part of ‘‘DECREASE”’.
Adjusting range: 70 ~ 110 g.cm.
INCREASE DECREASE
5A-4 Pinch Roller Pressing Force
As shown above, measure pressing force of the pnch
roller using a gauge. For measurement, proceed as
follows. Pull the pinch roller off the capstan haft
as shown with the arrow, and gradually release it tcthe
capstan. Just when the pinch roller starts rotating, ‘e ad
an indication of a gauge. Pressing force must rane in
300 g +50 g. If our of the range, bend the pinch rf fer
spring in the direction of B or C at section A smwn
above.
NOTE: To increase pressing force, bend the said spring
in the direction of B, and to decrease the force, betcf it.
in the direction of C.
CD-320

CD-320
5A-5 Torque Adjustment (PLAY)
Mount the extended parts A (two) of the disc leaf
spring on any one of the stepping parts of the idler.
Adjusting range: 40 to 70 g.cm.
NOTE:
(1) To increase torque, mount the extended parts on
“INCREASE” and to decrease torque, mount
them on “DECREASE”.
(2) Check the take-up clutch for slipping. When the
reel base is paused, the wheel must smoothly
rotate. The wheel, when irregularly rotating or
stopping, is not acceptable.
5A-6 Flywheel Thrust Adjustment
Adjust a clearance between the capstan tail end and
thrust bearing to a range from 0.1 to 0.3 mm as shown.
Adjust the thrust screw in the flywheel bracket using
a Philips screwdriver. Since the clearance cannot be
directly measured, capture a distance in an axial step of
the flywheel with the sensibility. After adjustment has
completed, secure the thrust screw with the screw lock.
INCREASE DECREASE
OO
2277 psa)
5A-7 Installation of Motor Pulley
Check to ensure that a clearance between the DC
motor and pulley is 3.1 mm. If out of specification,
reposition the pulley as shown.
5A-8 Tape Speed Adjustment
Mount 3 kHz test tape on the set, and check to make
sure that the meter pointer of a measuring instrument
(frequency counter) indicates 3000 Hz +3% or less as
specified. If tape speed exceeds the high limit, replace
the pulley with a pulley of parts No. 4367262050. If
the speed is lower than the low limit, replace it with a
pulley of parts No. 4367262040.

CD-320
5-B ELECTRICAL ADJUSTMENT
‘@ 3 F305
'@ & BATT CHECK ADu.
/@ \R301
1 TARL BALANCE.
---1 RI36
Leh’@ © METER LEVEL ADv.
Ber R236
Ren @ f
R218
PLAYBACK LEVEL.
Rech ‘OE fi
R215 Reh an ve
PravBack £0.22) /@}
1
iris
RUS
PLAYBACK LEVEL .
5B-1 Azimuth Adjustment
Play back the 10 kHz or 6.3 kHz standard alignment
tape. Adjust the azimuth adjusting screw 836 N. After
adjustment, repeatedly start and stop the tape several
times to ensure no azimuth deviation.
Moae : Playback vtIvm
(10 kHz) 8 = I
eae
Sg al os ee
ExTs

CD-320
5B-2 Meter Adjustment
SET UP
1. Power voltage: DC4.5V
2. Batt. check switch position: ON
PROCEDURES
1. Set up the unit for the playback mode of operation.
2. Apply an external DC 4.5 V source to the DC 6 V
jack.
Adjust R305 so that the meter reading is OVU
point of scale.
Ss
‘pe 7 BOS
'@ 1 BATT CHECK ADv.
---3 RI36
” METER LEVEL ADu.
2 R236
5B-3 Head Azimuth Adjustment
SET UP
1. Power voltage:
@ 50/60 Hz voltage rated for the unit to be used
in a market country.
® DCEV
2. Output terminal: LINE Output
3. EQ switch position: 120 uS
4. Test tape used: MTT-115C
PROCEDURES
1. Play the 10 kHz portion of the test tape MTT-
115C back. Adjust the head azimuth adjusting screw
for maximum VTVM read.
2. If the peak output reads of the right and feft chan-
nels are different, set the screws to obtain the
mechanical center between the peaks.
CAUTION
After adjustment, repeat the playback and stop setting
a few times to make certain of no head azimuth
deviation.

————_——_
5B-4 Tape Speed Adjustment
SET UP
1. Power voltage:
e@ 50/60 Hz AC voltage rated for the unit to be
used in a market country.
e DC6V
2. Output terminal: LINE Output
3. Test tape used: MTT-111 (3 kHz tone)
4. Unit position: | Horizontal
PROCEDURE
Play the mid position of the test tape MTT-111 back.
Adjust the tape speed adjusting semi-fixed resistor
3000 +5 Hz counter indication.
CAUTIONS
1. For adjustment the unit should be set up in the
normal operating condition.
2. Do not proceed the semi-fixed resistor more turns
than needed.
3. Do not proceed with adjustment after the unit.
4. \f a strong shock or similar vibration is applied
to the unit after adjustment, make certain that the
measured tape speed had not changed.
5. If the speed deviation occurs, perform the adjust-
ment again.
6. Be careful that the counter may indicate a wrong
value because of too low counter level.
7. Before adjustment, allow for 30 seconds or more
after depressing of the PLAY pushbutton.
CD-320
5B-5 Playback Output Level Adjustment
SET UP
1. Power voltage:
@ 50/60 Hz voltage rated for the unit to be used
in a market country.
e@ DC6V
2. Output terminal:
Q109
3. EQ switch position: 120uS
4. Test tape used: MTT-150
Terminal No. 8, 9 of Dolby IC
PROCEDURES
1. Play the test tape MTT-150 playback. Adjust R118
and R218 (20 kQ each) for 775 mV playback out-
put level.
2. Proceed both for the right and left channels in the
same manner.
CAUTION
This adjustment should be performed after the one for
the playback equalizer. If the playback equalizer is
adjusted after the playback output adjustment, the
playback output should be readjusted.
Mode: playback
vTVvM
Rais Reh c~~ 5
PLAYBACK EO. 2 @}

CD-320
5B-6 Playback Equalizer Adjustment
SET UP
1. Power voltage:
®@ 50/60 Hz voltage rated for the unit to be used
in a market country.
e DC6V
2. Output terminal: LINE Output
3. EQ switch position: 120 uS
4. Test tape: MTT-115C
PROCEDURES
1. Play the test tape MTT-115C. Let the 333 Hz signal
level be reference as O dB.
2. Adjust R115 and R215 (3 kQ each) for 10 kHz
frequency response of O to O dB in reference to
the 333 Hz signal level.
. Proceed both for the right and left channels in the
same manner.
. Note that clockwise turning of R115 and R215
will increase the 10 kHz signal output level.
Mode: playback
Tone. 315Hz—14kHz
R218
PLAYBACK LEVEL.
—
Reve 5
R215 Reh c~ ry
PLAYBACK EQ. ©
5B-7 VU Meter Adjustment
SET UP
1. Power voltage:
@ 50/60 Hz AC voltage rated for the unit to be
used in a market country.
e DC6EV
2. TAPE selector switch position: NORMAL
3. Load: Measuring instrument input impedance
4. Output terminal used: Terminal No. 8, 9 of
Dolby IC Q109
PROCEDURES
1. Play the test tape MTT-150.
2. Adjust R136 and R236 (2 k&2 each) until the VU
meter pointer deflects to the DOLBY mark (DQ)
on the VU meter.
Mode: record
Tone IkHz
at
OSC
ro
Pret
mic JN25, J225
‘@ 2 F305
(@ 5 BATT CHECK ADU.
727} RABE
ch, \@ t METER LEVEL ADy.
Ra’ a a R236
r 7
R36 ied
DOLBY Apv.\@
Reh
oo Raa
\@ © REC LEVEL ADU.
Leh
‘5 TI RI
ie Rs
pea |

5B-8
Recording
Current
Adjustment
(Temporal)
SET UP
1. Power voltage:
@
50/60
Hz
AC
voltage
rated
for
the
unit
to
be
used in a market country.
e DC6V
2. Input signal: 1 kHz, -60 dB signal
3. TAPE selector switch positions: NORMAL
4.
Load:
Measuring
instrument
input
impedance
PROCEDURES
1. Stop the recording bias current oscillation by
disconnecting the bias circuit +B resistor (R314).
2. Disconnect the recording head shielding leads
(grounding feads) at J302 (L channel) and J302
(R channel). Insert a 10 Q resistor between the
respective leads and terminals. Connect a VTVM
across each resistor. Set the CD-320 in the recording
mode of operation. Adjust the semi-fixed resistors
R146 (L channel) and R246 (R channel) until the
VTVM reads 0.45 mV each channel.
3. Proceed both for the right and left channels in the
same manner. ;
4. After adjustment, release the recording bias current.
‘& 2 R305
Qo BATT CHECK ADu.
=--; R136
Leh’@ ¢) METER LEVEL ADV,
a A
R3I6 ry
DOLBY ADy.\@
Reh
"3 R
\@ 5 REC LEVEL Abu.
t.
CD~-320
5B-9 Recording Bias Current Adjustment (Temporal)
SET UP
1. Power voltage: Only when the 6 V DC power
voltage is primary for the unit and this power
voltage is unavailable, use AC power supply.
2. TAPE selector switch: NORMAL
PROCEDURES
1. Disconnect the recording head shielding leads
(grounding leads) at J302 (L channel) and J302
(R channel). Insert at 10 Q resistor between the
respective leads and terminals. Connect a VTVM
across each resistor. Set the CD-320 in the recording
mode of operation. Adjust the semi-fixed resistors
R166 (L channel) and R266 (R channel) until the
VTVM reads 3.2 mV in each channel.
2. For the CD-320 equipped with the TAPE selector
switch, make certain that the VTVM reads approx-
imately 4.2 mV with it set to the CrO2 position,
Rais -Rehe~-=, Lh
PLAYBACK £0.23 @) /@\
1 1
RI66 7s,
Lani @ }
Nae
10

CD-320
5B-10 Record-Playback Frequency Response Adjust-
ment
SET UP
1. Power voltage: Only when the 6 V DC power
voltage is primary for the unit and this power
voltage is unavailable, use AC power supply.
2. Input signal: 1 kHz, -60 dB with -20 dB refer-
enced as 0 VU
3. TAPE selector switch: Bias: Low
EQ: 70uS
4. Output terminal: LINE OUT
5. Load: Measuring instrument input impedance
7. Test tape used: SONY CS-30
PROCEDURES
1. Connect the input signal to the MIC terminal.
Set up the CD-320 to the normal recording state.
2. In turn, reduce the input level by 20 dB with the
use of the attenuator. Record the 1 and 10 kHz
tones.
3. Play back the 1 kHz, 20 dB-down recorded tone
as O dB. Adjust the semi-fixed resistors R166
(L_ channel) and R266 (R channel) until the re-
sponse at 12.5 kHz is within +1 dB as referenced to
0 dB (the response at 1 kHz).
4. Proceed both for the right and left channels in the
same manner.
5. If the recording bias current is reduced in the above
adjustment, be sure to measure the distortion.
CAUTION
The adjusting rod should be non-metallic.
Mode: record
1K, 40. 10K, 12 5SKHz
at OSC
Bronk Tape
ane cttenuator
‘
JRO _ 6 ee om =
Mode Playbock Mic
Recorded VIVM
Portion ica aA
ic a LH
———
11
5B-11 Bias Trap Adjustment
SET UP
1. Power voltage: |
@ 50/60 Hz AC voltage rated for the unit to be
used in a market country.
e DC6V
2. Tape selector switch position: | Bias-High
PROCEDURES
1. Set up the unit in the recording mode of operation.
2. Connect the VTVM to LINE Output and collector
of Q106. Adjust L101 and L103 for minimum
VTVM read.
4. In turn, connect the VTVM to LINE Output (R ch)
and collector of 0206. Adjust L201 and 203 for
minimum VTVM read.
CAUTIONS
1. If the leak bias is less than the specified value, the
bias trap needs not to be adjusted since the adjust-
ing coil is factory preset.
2. The adjusting rod used should be nonmetalic.
5B-12 Adjusting the Dolby Circuit
1. Set the DOLBY NR switch to the OFF position.
2. Connect a 5 kHz signal to the Line input jack.
3. Adjust the input signal level until the output vol-
tage at the terminal No. 9 or 8 of Dolby IC 0109
is 23.5 mV.
. Turn the DOLBY NR switch to the ON position.
5. Adjust the LAW CONT semi-fixed resistor R316
until the output level at the terminal No. 9 or 8 of
Dolby IC Q109 is 8+0.25 dB higher than the one
obtained in Step 5 above.
BSS

5B-13 Playback Signal to Noise Ratio Measurement
SET UP
1. Power voltage:
e@ 50/60 Hz AC voltage rated for the unit to be
used in a market country.
e DC6V
2. EQ switch position: 1204S, 70 uS
3. Output terminal: LINE Output
4. Test tape used: MTT-112
PROCEDURES
1. Load the test tape MTT-112. Set up the unit to the
normal playback state with the use of the |.£.C. A-
curve Filter.
2. Read playback output as a O dB reference. Then
playback blank tape and note the output level drop
in dB.
3. Proceed both for the right and left channels in the
same manner.
4. Repeat the above measurement for each tape selec-
tor switch position.
STANDARD
Greater than 54 dB
CAUTIONS
1. Arrange the unit power cord for minimum hum
component.
2. Effect by induction noises shouldbe minimized for
the measurement.
Mode: playback
Tone 333Hz
Line Out
CD-320
5B-14
Playback
Output
Level
Measurement
SET UP
1. Power voltage:
@ 50/60 Hz AC voltage rated for the unit to be
used in a market country,
e DCE6V
2. EQ switch position: 120 uS
3. Output terminal: LINE Output
4. Test tape used: MTT-112
PROCEDURES
1. Play the tape back in the normal playback state.
Read the VTVM indication.
2. Proceed both for the right and left channels in the
same manner.
STANDARD
Within 860 mV
Mode: playback
Tone: 333 Hz
12

CD-320
13
5B-15 Playback Frequency Response Measurement
SET UP
1. Power voltage:
@ 50/60 Hz AC voltage rated for the unit to be
used in a market country.
e DCE6V
2. EQ switch position:
3. Output terminal:
4. Test tape used:
120 uS, 70 uS
LINE Output
MTT-116U (120 uS)
MTT-116K ( 70 uS)
PROCEDURES
. Play the test tape MTT-116U and MTT-116K back.
Let the 31.5 Hz and 14 kHz output level be 0 dB
as reference level.
. Read the 31.5 Hz to 14 kHz output level differences
from the 315 Hz O dB reference level.
. Proceed both for the right and left channels in the
same manner.
. For the above measurement, use the test tape MTT-
116U for the EQ 120 uS position and MTT-116K
for the EQ 70 uS position.
CAUTION
Since the test tapes used may involve same head
azimuth difference, the head azimuth should be
corrected at the highest frequency of each test tape
before measurement.
STANDARD
In reference to the 315 Hz, 0 dB signal output level,
+4 to-4 at 40 Hz
+4 to-6 at 12.5 kHz
Mode: playback
Tone VTVM
Line Out
5B-16 Record-Playback Output Level Measurement
(at LINE OUT)
SET UP
1. Power voltage:
@ 50/60 Hz AC voltage rated for the unit to be
used in a market country.
e@ DC6V
2. Input: 1 kHz, -60 dB signal
83. Load: Measuring instrument input impedance
4. Level control position: | SRL for recording opera-
tion
5. TAPE selector switch position: NORMAL, CrO2
and Fe-Cr
6. Measuring output terminal’ LINE OUT
7. Cassette tape used: TDK AC-211, AC-511 and
SONY CS-30
PROCEDURES
1. Record the 1 kHz, -60 dB signal in the normal
recording state.
2. Rewind the recorded part of tape and play it
back. Read the VTVM indication.
3. Proceed for the NORMAL’ CrO2 and Fe-Cr posi-
tions each in the same manner.
4. Proceed both for the right and left channels in the
same manner.
STANDARDS
1. NORMAL position: 560 mV +2 dB
560 mV +2 dB
560 mV +2 dB
2. CrO2 position:
3. Fe-Cr position:

CD-320
-
5B-17 Record-Playback, Harmonic Distortion Meas-
urement
SET UP
1. Power voltage:
@ 50/60 Hz AC voltage rated fro the unit to be
used in a market country.
e DC6V
2. Input: 1 kHz,-60 dB signal
3. Playback output level: Same as the recorded
signal level
4. Load: Measuring instrument input impedance
5. Measuring output terminal: LINE Output
6. Cassette tape used: TDK AC-211, AC-511 and
SONY CS-30
PROCEDURES
1. Record the 1 kHz signal in the normal recording
state.
2. Play the recorded signal back in the normal play-
back state. Calibrate the harmonic distortion
meter to 100% at the INPUT CONT. Adjust the
adjusting knob for minimum meter pointer deflec-
tion, and read the harmonic distortion.
3. Proceed both for the right and left channels in
the same manner.
4. Proceed for the NORMAL, CrOz and Fe-Cr posi-
tions each in the same manner.
STANDARDS
1. Less than 2.5% for the NORMAL and CrQ2 posi-
tions.
2. Less than 3.5% for the Fe-Cr position.
CAUTIONS
1. Be sure to demagnetize the heads as the measured
values may deviate from the accurate values.
2. Note that excessive wow and flutter also causes
deviation of the measured values.
Mode: record
IKHZ
af OSC
Bonk Tape
]
2 stort:on Meter
Mode: playback
Recorced
Portion
‘00Kn 4
>IT £8:
Line Out
5B-18 Record-Playback Signal-to-Noise Ratio Meas-
urement
SET UP
1. Power voltage:
@ 50/60 Hz AC voltage rated for the unit to be
used in a market country.
® DC6V
2. Input: 1 kHz,-60 dB signal
3. Playback output level: Same as the recorded
signal level
4. Load: Measuring instrument input impedance
5. Measuring output terminal: LINE Output
6. Cassette tape used: TDK AC-211, AC-511 and
SONY CS-30
PROCEDURES
1. Record the 1 kHz signal in 3 dB above the normal
recording state.
Z. Disconnect the input signal from the microphone
jack. In this state, record no signal.
3. Play the 1 kHz signal back in the normal playback
state with the use of the I.E.C. A-Curve Filter.
Let the output level be 0 dB as reference level.
4. Read difference between the recorded O GB ref-
erence output and no-signal output levels.
5. Proceed both for the right and left channels in
the same manner.
6. Set the DOLBY switch to the ON position, and
proceed with similar measurement.
STANDARDS
1. Greater than 56 dB for the ON position of the
DOLBY switch.
2. Greater than 46 dB for the OFF position of the
DOLBY switch.
CAUTION
Arrange the CD-320 power cord for minimum hum
component.
Mode: record
tkHz .at OSC Blank Tape
ae
CO.
eS Loe aN
Mic
Mode: record
Blank Tape
=1-6)
Mode: playback
Recorded IEC A-Cure VTVN
Portion 100 ka Filter
ma |
0 oW—o
an | ue 3 ae
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Line Out
aan ener ee
14

CD-320
5B-19 Record-Playback Frequency Response Measure-
ment
SET UP
1. Power voltage:
voltage is primary for the unit and this power
voltage is unavailable, use AC power supply.
2. Input: 1 kHz, -60 dB signal with -20 dB as 0 VU
3. Playback output level: Same as the recorded sig-
nal level.
4. Load: Measuring instrument input impedance
5. Measuring output terminal: LINE Output
6. Cassette tape used: TDK AC-211, AC-511 and
SONY CS-30
PROCEDURES
1. Record the 1 kHz signal in the normal recording
State. In turn, reduce the input level by 20 dB
with an attenuator. Then, record the 1 kHz, 40 Hz,
10 kHz, 13 kHz, 14 kHz and 15 kHz signals.
2. Play the recorded 1 kHz signal back in the normal
playback state.
3. Let the 1 kHz, -20 dB-down signal level be 0 dB
as reference level. Read difference of the 40 Hz,
10 kHz, 13 kHz, 14 kHz and 15 kHz signal output
levels from the 1 kHz signal 0 dB reference level.
4. Proceed for the NORMAL, CrOz and Fe-Cr posi-
tions each in the same manner.
5. Proceed both for the right and left channels in
the same manner.
STANDARDS
1. NORMAL position:
40 Hz ~ 10 kHz
with DOLBY switch at OFF
2. CrO2 position:
40Hz~12.5kHz ............ +4,-6dB
with DOLBY switch at OFF
3. Fe-Cr position:
40Hz~12.5kHz ............ +4,-6 dB
with DOLBY switch at OFF
4. NORMAL CrQ2 and Fe-Cr positions:
40 Hz~ 12.5kHz ............ +5,-7dB
with DOLBY switch at ON
Mode: record
1K, 40, 10K. 12 5KHz
of OST
ances cttenvator
:
ff 8 fae
Mode Playback
Bicnk Tope
Recordec vTvM
Portion ioKe La]
Peel
Line Out
15
Only when the 6 V DC power.
5B-20 Erasing Effect Measurement
SET UP
1. Power voltage: Only when the 6 V DC power
voltage is primary for the unit and this power
voltage is unavailable, use AC power supply.
2. input: 100 Hz, -60 dB signal with +10 dB as
OVU.
3. Playback output level: Same as the recorded sig-
nal level.
4. Load: Measuring instrument input impedance
5. TAPE selector switch position: NORMAL, CrO2
and Fe-Cr
6. Cassette tape used: TDK AC-211, AC-511 and
SONY CS-30
7. Filter used: 100 Hz band-pass filter
PROCEDURES
1. Record the 100 Hz input signal in the normal
recording state.
2. In turn, increase the input level by 10 dB with the
attenuator, and record it.
3. Rewind a half portion of the 10 dB-up tape and
record in no-signal state, or erase, on the portion
with the input signal disconnected from the micro-
phone jack.
4. Play back in the normal playback state the input
signal recorded in the normal recording state.
5. In turn, let the 10 dB-up recorded signal level
be O dB as reference level. Read difference of the
level at the erased portion from the O dB reference
level.
STANDARD
Greater than 55 dB.
Mode: record
100 Hz
at OSC
Mode: record
Bionk Tape
Mic
Hoif of recorded
Portion
3)
Mode: playback
Recorded
Bortion
p

5B-21 Leak Bias Measurement
SET UP
1, Power voltage:
@ 50/60 Hz AC voltage rated for the unit to be
used in a market country.
® DCEV
. Input: 1 kHz, -60 dB signal
. Load: Measuring instrument input impedance
. Level control position: SRL
. Tape selector switch position:
and Fe-Cr
NORMAL CrO2
PROCEDURES
1, Record the 1 kHz input signal in the normal record-
ing state. Let the monitor output level at the LINE
OUT terminal be O dB as reference level. Read
difference of the output level having the input
signal disconnected from the O dB reference level.
. Proceed both for the right and left channels in the
same manner.
STANDARD
Lower than -47 dB
Mode: reocrd
IKHZ
5B-22 Cross Talk Measurement
SET UP
1. Power voltage:
@ 50/60 Hz AC voltage rated for the unit to be
used in a market country.
®@ DCE6V
. TAPE selector switch position: NORMAL
. Load: Measuring instrument input impedance
. Measuring output terminal:
. Test tape used: MTT-121
LINE Output
oBWN
PROCEDURES
1. Playback the R channel on the side A of the test
tape MTT-121. Assure that the output response at
1 kHz be O dB as reference level.
2. {'n turn, playback the R channel on the side B
of the test tape MTT-121. Read the output level
deviated from the O dB reference level.
STANDARD
Less than 55 dB
Mode: playback
Recorded 1 kHz VIVM
Portion 100k Band Pass (eal
o o———-9
= unt [8 LL pane
Lt uu
Line Out
CD-320
5B-23 Channel Separation Measurement
SET UP
1. Power voltage:
@ 50/60 Hz AC voltage rated for the unit to be
used in a market country.
®@ DCE6EV
. TAPE selector switch position:
MONITOR switch position: TAPE
Load: Measuring instrument input impedance
. Measuring output terminal: LINE Output
. Test tape used: MTT-141
NORMAL
AaRWN
PROCEDURES
1. Playback the L channel of the test tape MTT-
141. Assume that the output reference at 1 kHz
be O dB as reference level.
2. In turn, playback the L channel. Read the output
level from the 0 dB reference level.
STANDARD
Less than 34 dB
Mode: playback
Recorded VTVM
Portion
100ka.
Band
Pass
.
eee
en
1 kHz
CHANGE OF POWER TRANSFORMER
PRIMARY VOLTAGE (for Europe Mode Only)
The CD-320 is wired for 220V line voltage. It can be
operated with 110V AC by changing the power trans-
former lead wire as illustrated.
WHT
16

CD-320
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