Sony CFS-204 User manual

Frequency range
AEP model |
Italian model
Recording system
Frequency response
Speakers
Power output
Output
Power requirements
Power consumption |
aN
87.6—107MHz 531 —1,602kHz
87.5—-108MHz
SPECIFICATIONS
526.5—1,606.5kHz
4-track 2-channel stereo
80Hz—8,000Hz
Full-range: 10cm (4 inches) dia. x2
2.3W+2.3W :
(at 10% harmonic distortion) at DC
operation
Headphones jack (stereo minijack),
16-68 ohm impedance
220V AC, 50Hz
9V DC, six R14 (size C) batteries
14W
Model Name Using Similar Mechanism
Tape Trasport Mechanism Type
Battery life ;
AEP Model
CFS-W304
| MF-204-64
“FM recording
Sony SUM-2 (NS) Approx. 4 hours
Sony AM2 alkaline _ Approx. 8 hours
Dimensions Approx. 460 X 145 X160mm (w/h/d)
(18'/, x 53/, X 63/, inches)
incl. projecting parts and controls
Weight Approx. 2.4kg (5 lb 5 oz), incl. batteries
Accessory supplied AC power cord (1)
Design and specifications subject to change without notice.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK /\ OR DOTTED
LINE WITH MARK A\ ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
RADIO CASSETTE-CORDER
SO

CFS-204
| SECTION 1
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
1-1. REMOVAL OF CASSETTE HOLDER
Remove the cassette holder
_ shown by arrow @. -
1-2. DIAL POINTER SETTING
@ Set the pointer to the center ‘\
~ seracthed lines. —
4
|
@
Turn
tuning
knob
fully’
in
the
direction
of
the
arrow.
—2—

SECTION 2
MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-
moistened swab: | |
record/playback head
erase head
pinch roller
rubber belts
capstan | idlers _ 3
2. Demagnetize the record/playback head with a head
demagnetizer. (Do not bring the head demagnetizer close
to the erase head.) oe
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound
to the parts adjusted. | | | | |
5. The adjustments should be perfomed with the rated
power supply voltage unless otherwise noted.
6. Power supply voltage: 9V dc. _
Torque Measurement
— -20~60g*em
Forward 2—-6g*cm
ae _(0.028—0.083 0z+inch)
Fast more than 45g*-cm
ante (more than 0.62 oz*inch).
—
CQ2018
rein
giana
(more than 0.62 oz+inch)
Tape Tension Measurement
ne
more than 70g
{more than 2.47 oz)
CFS-204
SECTION 3
ELECTRICAL ADJUSTMENTS
3-1. TAPE RECORDER SECTION —
Standard Output Level
Output terminal SP OUT HP OUT
oT (dB) | 0250 (1086)
Test Tape
ee
Tape Speed Adjustment
Procedure :
speed checker |
Mode: playback LFEM-30
or eee
test tape _ » digital frequency
WS-48A counter _
(3kHz,0dB)
ne
headphones jack
F
Adjustment Value:
Speed checker Digital frequency cou nter.
Frequency difference between the beginning and the end of
the tape should be within 1% (30Hz).
Adjustment Location :
tape speed adjustment
contro! inside motor

CFS-204
3-2. RADIO SECTION
@FM Section
Setting :
FUNCTION switch: FM
_FM rf signal
generator
telescopic antenna
input terminal
. 22.5kHz frequency
deviation by 400Hz signal
output level: as low as possible
e AM Section ©
Setting : |
FUNCTION switch: AM
AM ff signal
generator
Put the lead-wire
antenna close to
the set.
30% amplitude
modulation by. ~
400Hz signal 7
output level: as low as possible
VTVM
-- trange: 0.5—5V ac)
Headphones jack
@ Repeat the procedures in each adjustment several times,
and the frequency coverage and tracking adjustments
should be finally done by the trimmer capacitors.
@® Remove telescopic antenna in FM section adjustments.
FM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on VT VM.
AEP: 87.6MHz. | AEP: 107.0MHz
IT: 87.35MHz IT: 108.3MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on VT VM.
1 :
AEP: 87.6MHz AEP: 107.0MHz
IT: 87.35MHz IT: 108.3MHz
AM FREQUENCY COVERAGE
ADJUSTMENT ae
Adjust for a maximum reading on VT VM.
: AEP: 520kHz AEP: 1,680kHz
IT: 516kHz IT: 1,630kHz
__ AM-TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM
600kHz 1,400kHz
AM IF ADJUSTMENT
Adjust for a maximum reading on VTVM. —
. | 455kHz
eT: Italian model |

CFS-204
vco Adjustment
Procedure:
FM rf signal
generator
telescopic antenna
input terminal
Carrier frequency : 98MHz
Modulation : no modulation
Output level : 0.1V (100dB)
1. Connect frequency counter as shown below.
2. Tune the set to 98MHz.
3. Adjust RV1 for 76kHz+500Hz reading on the frequency
counter. .
tuner board (conductor side)
1 TO AUDIO BOARD
KH301
frequency counter
|-634-194-
Adjustment Location : tuner board (component side)
telescopic antenna
input terminal.
q
AM | 13
ADJ CT3 .
AM FREQUENCY
FM FREQUENCY [ce -L4 } COVERAGE
COVERGE L2 .. 3 ADJ
ADJ
ee FM
G71 } TRACKING
ADJ
RVI 7
VCO ADJ as
AM IF ADJ

CFS-204
SECTION 4
DIAGRAMS
4-1. PRINTED WIRING BOARD —TUNER SECTION—
1 2 3 4 | 5 6 7
ANT |
TELESCOPIC
ANTENNA
A
[TUNER BOARD]
B
£3
- AM
FERRITE—-ROD
C
D
TO AUDIO BOARD
KH30i
(See page 9.) |
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,
;
1634-194
-
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Note:
| | |
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RIPPLE
MUTE
AMP
FILTER
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4-2.
SCHEMATIC
DIAGRAM
—TUNER
SECTION—
9
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1
2
3
4
5
6
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8
12
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11.)
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Q2
SWITCH
Note:
e
All
capacitors
are
in
wF
unless
otherwise
noted.
pF:
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SOWV
or
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except
for
electrolytics
and tantalums.
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All
resistors
are
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2
and
'/,W
or
less
unless
otherwise
specified.
.
4: internal component.
e
Power
voltage
is
dc
9V
and
fed
with
regulated
dc
power
supply
from
battery
terminal.
e Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark: FM
( ): AM
e Voltages are taken with a VOM (Input Impedance 10M 2).
Voltage variations may be noted due to normal produc-
tion tolerances. |
e Signal path.
= :FM
e IT: Italian model

4-4. PRINTED WIRING BOARDS —AUDIO SECTION—
: J30! RED @ SP902
SPEAKER -
ry
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R-CH
OPR/ BATT MIC3OI [MAIN BOARD]
TO TUNER
BOARD
CNU2I
(See page 6.)
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SPEAKER
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$302
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RADIO OFF
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$306
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|-~634-195-

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4-5.
SCHEMATIC
DIAGAM
—AUDIO
SECTION—
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OPR/ BATT
TOTAL CURRENT
FM: 48mA
AM: 46mA
CNJBOI PLAY: 96mA
[N00 REC: 118mA
POWER TRANSFORMER :
, FF :103mA
REW: 37mA
DRY BATTERY
SIZE" G™
(1EC DESIGNATION RI4)
6PCS,9V
i
O
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'
‘
'
'
'
'
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1
!
O
L
Note:
e All capacitors are in uF unless otherwise noted. pF: uur
5OWV or less are not indicated except for electrolytics
and tantalums.
e@ All resistors are in 2 and '/,W or less unless otherwise
specified.
Note: The components identified by mark A or dotted
line with mark A are critical for safety.
Replace only with part number specified.
© Power voitage is dc 9V and fed with regulated dc power
supply from battery terminal.
e Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark: PLAY
( ): REC
@ Voltages are taken with a VOM (Input Impedance 10M).
Voltage variations may be noted due to normal produc-
tion tolerances.
e Signal path.
c> :FM
>». :PB
yy») : REC
e IT: Italian model
CFS-204