Marantz SUPERSCOPE CRS-2204 User manual

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SUPERSCOPE.
BY BRRee Been nn i
=
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Sel cota
UPERSCOPE INC.
20525 NORDHOFF STREET CHATSWORTH,
a™.© CALIFORNIA 91311-U.S.A.
ce

CRS-2204
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
SUPERSCOPE
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 payt is required (indicate SUPERSCOPE).
Account number (for account customers only).
TPWN >=
Direct
consumers
will
be
provided
with
the
current
retail
price
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 fo!lowing 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
III,
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 Bane Beem eel z ©
(
ates

CRS-2204
TABLE OF CONTENTS
SPECIFICATIONS «...-- eee eee ee eee eee eee 1 9.6 [POQ3-99] Flywheel ................. 24
1. (REATUIRES® och eased teen eae data es 2 9.7 [P04-99] Parts Assembled on the Top
2. DISASSEMBLY ......-.-. 0c eee eee ee 3 of the Chassis .. 2... 0.0.0.0 0 00 ecu 24
2.1 Removing the Cassette Compartment Lid .. 3 9.8 [PO5-99] Parts Assembled on the Reverse ..
2.2 Removing the Back Cover .........-... 3 of the Chassis .. 2.2.2... 002 eee eee 25
2.3. Removing the Chassis .-..........200. 3 9.9 [(HO1-99] Packing Materials............ 26
2.4 Removing the Mechanical Assembly ..... 4 9.10 Electrical Parts List ..............05. 27
3. SERVICE GUIDE ...-. 2c cc cn ce wee 4
3.1 Battery Voltage .--.--... eee cease 4
3.2 Battery Polarity ........-......00005 4
3.3. Cleaning the Heads .............000, 4
3.4 Current Consumption ............... 4
3.5 Voltage Conversion for N Version Only .... 4
4. DIAL STRINGING ................008, 5
5. MECHANICAL ADJUSTMENTS ........... 6
5.1 Checking the Play Operation .......... 6
5.2 Adjusting the Pause Timing ........... 6
5.3 Adjusting the Fast Forward and
Rewind Torque .........2.2000e eee 6
5.4 Adjusting the Pinch Roller Pressure ...... 7
5.5 Adjusting the Play Torque ............ 7
5.6 Adjusting the Flywheel Thrust ......... 7
5.7. Positioning the Motor Pulley .......... 8
5.8 Adjusting the Tape Speed ........-... 8
6. ELECTRICAL ADJUSTINGS AND
MEASUREMENTS ..---- +e 2 eee eee ee eee 8
6.1 Adjusting the Playback Level -----+--.- 8
6.2 Adjusting the Head Azimuth .-..-.+.--- 9
6.3 Adjusting the Bias Current ..-..-..-+-- 9
6.4 Measuring the Signal-to-Noise Ratio
(in Playback Mode) ....-.....-2+.-.00- 9
6.5 Measuring the Playback Frequency .-.....-
Response «+--+ - seer eee n eee rene nee 9
6.6 Measuring the Combined Recording and
Playback Frequency Response ......... 9
6.7. Adjustingthe ALC Level ............. 10
6.8 Measuring the Combined Recording and
Playback Level ............2-0008.5 10
6.9 Measuring the Combined Recording
and Playback Distortion.............. 10
6.10 Measuring the Combined Recording
and Playback Signal-to-Noise Ratio ...... 10
6.11 Measuring the Erasing Level ....-...... 10
6.12 Calibrating the VU Meter ............. 10
7. ALIGNMENT PROCEDURES ............. 11
7.1. FM Alignment Procedure ....-....---+5 11
7.2 FM Stereo Separation Alignment Procedure. 12
7.3. MW Alignment Procedure...........-- 12
7.4 LW Alignment Procedure ............. 13
7.5 SW Alignment Procedure ......-.-.-5- 13
8 (DIAGRAMS bos c0 oe ante ak ee ae ae are tS 14
8.1 Level Diagrams... -- eee eee eee ee ees 14
8.2. Block Diagram --- +. eee eee eee eee 15
8.3. Schematic Diagram ------ +--+ ese ees 16
8.4 Circuit Board Diagram - +--+ +--+ sees 18
9. EXPLODED VIEWS AND PARTS LIST ------ 20
9.1 [C01-99] Front Case------- +--+ ee eee 20
9.2 [C0O2-99] Rear Lid and Upper Case ------- 21
9.3 [MO1-99] P.W. Boards and General Parts .-- 22
9.4 [P01-99] Operation Levers and Buttons .... 23
9.5 [P02-99] Head Chassis ..---- +--+ +e eee 23

CRS-2204
SPECIFICATIONS
GENERAL:
DIMENSIONS (WxHxD). . .15-7/16 x 9-3/16 x 4-15/16 in.
(39.2 x 23.3 X 12.5 cm)
WEIGHT (with batteries) 9 tbs., 4 02. (4.2 kg)
POWER REQUIREMENT
N: 110/220 V AC, 50 Hz, 18 W
A.T: 240 V AC, 50 Hz, 18 W
Six ‘‘D”’ Size Batteries
External 9 V DC
NUMBER OF SEMICONDUCTORS:
Integrated Circuits
Field Effect Transistors
Transistors
Light Emitting Diodes
TERMINALS:
Microphone x 2 Plug Type: Mini
Input Sensitivity: 0.25 mV (—72 dB)
Impedance: 4.5 kQ
Plug Type: Mini
Input Sensitivity: 55 mV (—25 dB)
Impedance: 60 kQ
Plug Type: DIN
Input Sensitivity: 20 mV
Impedance: 40 kQ
Plug Type: DIN
Output Level: 0.5 V (—6 dBV)
Output Impedance: 2.5 kQ
Plug Type: Mini
Output Power 2 W x 2 (4.Q) DC
External FM Antennax1.... Input Impedance: 75 2
Stereo Headphone x 1 Plug Type: Phone
Impedance: 8 22
External Input x 2
DIN Input
DIN Output
External Speaker x 2
AC Inlet x 1
DC9Vx1
Remote Control x 1
TAPE RECORDER SECTION:
Philips Type Cassette Tape
4-Track Stereo
AC Bias
AC Erase
110 Seconds (C-60)
. 125 Hz to 8 kHz (—5 dB)
ERASING SYSTEM
REW/FF TIME
FREQUENCY RESPONSE
SIGNAL-TO-NOISE RATIO
TAPE SPEED 1-7/8 ips (4.8 cm/sec) +3%
Less than 0.2% rms
TUNER SECTION:
CIRCUIT SYSTEM 4-Band FM/MW/SW/LW
Superheterodyne
FM: 88 to 108 MHz
MW: 525 to 1605 kHz
SW: 6 to 18 MHz
LW: 150 to 370 kHz
FM: 10.7 MHz
MW/SW/LW: 455 kHz
FM/SW: Telescopic Rod
MW/LW: Ferrite-rod
FM: 6 nV (30 dB S/N)
MW: 600 uV/m (20 dB S/N)
SW: 150 pV/m (20 dB S/N)
LW: 900 pV/m (20 dB S/N)
SIGNAL-TO-NOISE RATIO... FM: 45 dB (Input 1 mV)
MW/SW/LW: 40 dB (Input 5 mV/m)
FM STEREO SEPARATION 25 dB (Input 1 mV)
INTERMEDIATE FREQUENCY
ANTENNA

1. FEATURES
(1) Full IC Circuits Construction
e@ Audio full-line three-IC stages
Each
audio
channel
consists
of
three
ICs:
an
equalizer
amplifier
having
ALC,
a
line
amplifier,
and
power
ampli-
fier.
The
power
amplifier
IC
is
made
up
of
SEPP
circuit
that
assures
2.0
W
output
power
per
channel!
with
9
V
source.
The
audio
full-line
is
illustrated
below.
EQ LINE POWER SPK
AMP AMP AMP 3.22
@ Quadrature-detection AM/FM and IF IC
The quadrature detection, which is the same as that of
usual hi-fi tuners, provides quality tone with little distor-
tion. The single hump tuning and S-curve alignment can
be accomplished by adjusting two points only, to which
5 or more points in the previous circuit are reduced.
@ Low-voltage, PLL multiplex FM stereo IC
The present PLL (phase-locked loop) multiplex IC can
be run by power voltage as low as 6 V for the first time
as the source voltage for the tuner is decreased to 6 V
through a ripple filter, while previous Cs requires 12-V
power source for good channel separation, for stable,
wide sound field. Alignment can be accomplished very
easily by adjusting two semifixed controls only as com-
pared with inductor adjustment in previous circuit.
(2) Large-Sized, Speaker System ;
The speaker, the 12-cm diameter of which is best in this
class of tape recorder, produces lush, comfortable, dy-
namic sound.
(3) Large-Sized Tripple Meter
The easy-to-read, large-sized meter indicates a battery
voltage in the tape playback operation, a tuning state in
a radio program reception, or a VU in any recording
operation.
(4) Matrix Stereo System
The main signal is mixed with the out-of-phase signal
which is taken from the other channel and passed
through a filter having a certain bandwidth. This makes
the reproduced sound by far deeper and wider than
usual, thus providing rather high stareophonic effect.
(5) Powerful Output
The output power is as high as 4 watts, 2 watts for each
channel at 4-22 load.
(6) Variable Sound Monitor
In recording a radio program, the sound volume and
tone can be freely changed without affecting the record-
ing level.
CRS-2204
(7) Total Shut-off Mechanism
The tape is automatically stopped at the end in the play-
back, fast forward, or even recording mode of operation.
(8) Cue and Review Mechanisms
(9) One-Touch Recording System
Recording can be made by pressing the REC button only.
(10) Large-Sized Chassis
The large-sized chassis facilitates easy adjustment at any
point when the casing is removed. The number of screws
are minimized and the power transformer, external jacks,
meter, and similar devices are fit-assembled so that main-
tenance and service are very easy.

CRS-2204
2. DISASSEMBLY
2.1 REMOVING THE CASSETTE COMPARTMENT LID 2.3 REMOVING THE CHASSIS
While pressing the point A and B in the arrow direction, . Remove the seven knobs A through G.
pull the lid toward as shown. The lid will be removed.
TUNING
TONE (TREBLE)
TONE (BASS)
BALANCE
1.S SWITCH
VOLUME
. Remove the five screws 1 through 5.
. The top escutcheon (G) will be removed.
. Then the chassis will be removed.
. Unplugging the speaker connector separates the
front case from the chassis body.
NOTE:
The knobs of the FUNCTION, MODE, and AFC
switches should be replaced after putting the inside
white cap on the switch schafts.
2.2 REMOVING THE BACK COVER
1. Open the battery compartment cover by depressing
the finger grip and pulling down. Remove the seven
screws 1 through 7.
2. Disconnect the antenna lead connector A, and the
back cover will come off the casing.

24 REMOVING THE MECHANICAL ASSEMBLY
1. Remove the four screws 1 through 4.
2. Disconnect the lead connector from Motor Switch.
CRS-2204
3. SERVICE GUIDE
3.1 BATTERY VOLTAGE
Many customers often determine that the set is faulty
when malfunctioning as they are not aware of used-up
battery. Before operation, therefore, make certain that
the battery voltage is higher than 6.75 V.
3.2 BATTERY POLARITY
In loading the battery, particular care should be taken in
its polarity as wrong placing may damage transistors and
motor.
3.3 CLEANING THE HEADS
The head slit contaminated with tape chips and powder,
rubber, dust, or dirt leads to insufficient sound volume
and tone deterioration. Wipe such contaminants off the
slit using soft cloth moistened with alcohol or carbon
tetrachloride.
3.4 CURRENT CONSUMPTION
VOLUME
Maximum
Minimum
Maximum
Minimum
*Units in mA.
The above values may differ slightly depending on
individual sets.
Measuring conditions (standard inputs)
Radio
AM: 5 mV, 400 Hz, 30% mod.
FM: 71 mV, 400 Hz, 30% mod.
Tape Recorder
Recording: 1 mV, 1 kHz at mic input
Playback: Test tape MTT 112 (333 Hz, 250
nwb/m)
3.5 VOLTAGE CONVERSION FOR N VERSION ONLY
This unit may be converted to 110 V operation by the
Voltage Selector Switch (S002) Located within the Bat-
tery Compartment.

5. MECHANICAL ADJUSTMENTS
CRS-2204
PRECAUTIONS: Prior to any adjustments, clean the head slits with soft cloth or cotton swab moistened with denatured
alcohol or carbon tetrachloride, and fully demagnetize the head, capstan and similar parts.
5.1 CHECKING THE PLAY OPERATION
5.1.1 CHECKING THE PLAY TIMING
It is normal that when the PLAY pushbutton is depress-
ed, the take-up reel table turns first, then the pinch rol-
ler is rotated. The reel table and pinch roller must not
start turning at the same time.
NOTE:
Make certain that such a subsequent operation is mode
irrespective of locking state is depressed slowly without
loading the tape.
Slowly depress the PLAY pushbutton, and the take-up
reel table will start turning. At that time, check to make
certain that a clearance between the pinch roller and
capstan is less than 0.5 mm.
5.2 ADJUSTING THE PAUSE TIMING
Set the recorder in the playback mode. Depress the
PAUSE pushbutton slowly, and the take-up reel will
pause. As that time, check to ensure that a clearance be-
tween the pinch roller and ranges from 0.2 to 0.5 mm. If
out of the range, adjust a bending angle of the pinch
roller bracket arm (part A).
NOTE:
To increase a clearance between the pinch roller and
capstan, decrease the angle {in the direction C). To de-
crease the clearance, increase the angle (in the direction
B).
5.3 ADJUSTING THE FAST FORWARD AND REWIND
TORQUE
Set the extended parts (B in the figure) 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 step-
ping part of “INCREASE” and to decrease it, set those
to the stepping part of “DECREASE”.
Adjusting range: 70 to 110 g-cm
5.1.2 ADJUSTING THE PLAY TIMING
If out of specification, bend the part of the pinch roller
bracket which faces the head chassis stopper. In the
figure shown, bend the part in the direction of A to de-
crease the clearance. To increase the clearance, bend the
part in the direction of B.
0.2~0.5mm
CAPSTAN SHAFT
a
\. PINCH ROLLER
\ HEAD CHASSIS STOPPER
NOTE:
After adjustment, check to be sure that the pinch roller
bracket does not contact the head chassis stopper in
PLAY mode.
INCREASE DECREASE
—ti
ILIA

CRS-2204
5.4 ADJUSTING THE PINCH ROLLER PRESSURE
Measure the pressure of the pinch roller using a gauge as
shown. For measurement, draw the pinch roller in the
arrow direction in which it is detached from the capstan
shaft and gradually return it toward the capstan. Read
the gauge at the time when the pinch roller starts turning.
The standard pressure is 30050 g. If the pressure is out
of the range, bend the pinch roller spring aroung the
point A in the direction B or C.
5.5 ADJUSTING THE PLAY TORQUE
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
NOTES:
(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 ac-
ceptable.
5.6 ADJUSTING THE FLYWHEEL THRUST
Adjust the thrust screw at the flywheel bracket until the
clearance between the capstan tail end and thrust bear-
ing is 0.1 to 0.3 mm as shown, using a phillips screw
driver. For adjusting, feel of axial dropping of the fly-
wheel for proper clearance as this cannot been seen
through. Then paint the screw to lock.
.———
——
Hl!
Mt
y
4
4
4
$s SSS
NOTE:
To make the pressure strong, bend in the direction B. To
make the pressure weak, bend in the direction C.
INCREASE DECREASE
et
2227s)
ADJUSTING
SCREW