CFS-1085S - Sony Audio Service Manual (repair manual)

Model
CFS-1085S
Pages
30
Size
1.51 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cfs-1085s.pdf
Date

View Sony CFS-1085S Service Manual online

CFS-1085S
E Model
RADIO CASSETTE-CORDER
SERVICE MANUAL
SPECIFICATIONS
Model Name Using Similar Mechanism                   CFS-1065S
Tape Transport Mechanism Type
                MF-1055-117
9-873-310-03
2003L02-1
© 2003.12
Ver 1.2  2003.12
• Frequency range
FM: Saudi Arabia: 87.5–107 MHz/
Other countries: 87.5–108 MHz
MW: Saudi Arabia: 530–1 605 kHz/
Other countries: 530-1 611 kHz/
SW1: 2.3–7 MHz/SW2: 7–22 MHz
 IF
  FM: 10.7 MHz,
MW/SW: 455 kHz
• Antennas 
 FM/SW: Telescope/
MW: Built-in ferrite bar
• Recording system
  4-track, 2-
channel stereo
• Frequency response
  80–10 000Hz
• Speakers
  Woofer: 10 cm (4 inches)
dia., 6 
Ω,cone type/Tweeter: 2 cm
(
13
 ⁄
16
 inch) dia.
• Input 
 CD/TV LINE IN jacks
(phono jacks), sensitivity 0.436 V,
input impedance 47 k
• Output 
 Headphones jack (stereo
minijack), for 6–32 
Ω impedance
headphones
• Maximum Power output
10 W
• Battery life
FM Recording: Sony R20P: Approx.
5 hours/Sony LR20 alkaline:
Approx. 10 hours
Playback: Sony R20P: Approx. 1.5
hours/Sony LR20 alkaline:
Approx. 3 hours
• Power requirements
110–120V/220–240 V AC
selectable, 50/60 Hz
9V DC, six R20 (size D) batteries
• Power consumption
AC 14 W
• Dimensions
  Approx. 579 x 206 x
197 mm (w/h/d) (22 
7
 ⁄
8
 x 8 
1
 ⁄
8
 x
7
 ⁄
8
 inches) incl. projecting parts
and controls, not incl. handle
• Mass 
 Approx. 4.6 kg (10 lb 2 oz)
incl. batteries
• Supplied accessory 
 AC power
cord (1)
Design and specifications are
subject to change without notice.
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
2
CFS-1085S
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK 
!
 OR DOTTED LINE
WITH MARK 
!
 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 PUBLISHED BY SONY.
TABLE OF CONTENTS
1. GENERAL
.......................................................................... 3
2. DISASSEMBLY
2-1. Power Board ......................................................................... 4
2-2. LED Board, GE SW Board, MEGA BASS Board ................ 5
2-3. MAIN Board, MIC Board, VOL Board ................................ 5
2-4. Mechanism Deck, Tuner Board ............................................ 6
2-5. Record/Playback Head (HRP101), Erase Head (HE301),
         Belt, Motor (M601) ............................................................. 6
2-6. Dial Pointer Installation ........................................................ 7
3. ADJUSTMENT 
.................................................................. 8
4. DIAGRAMS
4-1. Circuit Boards Location ...................................................... 12
4-2. Block diagrams ................................................................... 13
4-3. Printed Wiring Board – Main Section – .............................. 14
4-4. Schematic Diagram – Main Section – ................................ 15
4-5. Schematic Diagram – Tuner Section – ................................ 16
4-6. Printed Wiring Board – Tuner Section – ............................. 17
4-7.
IC Block Diagrams ........................................................... 18
5. EXPLODED VIEWS
5-1. Rear Cabinet Section ........................................................... 20
5-2. Front Panel Section ............................................................. 21
5-3. Speaker Section ................................................................... 22
5-4. Mechanism Deck Section (1) .............................................. 23
5-5. Mechanism Deck Section (2) .............................................. 24
6. ELECTRICAL PARTS LIST
.................................
25
3
CFS-1085S
SECTION 1
GENERAL
This section is extracted from
instruction manual.
Location of controls
PHONES
FUNCTION
VOLUME
SOUND SELECT
BAND
FINE TUNING
TUNING
FM STEREO
CD/TV
LINE IN
MIC
MAXI BASS
OPR/
BATT
4
CFS-1085S
SECTION 2
DISASSEMBLY
2-1. POWER BOARD
Note:
 Disassemble the unit in the order as shown below.
Note:
 Follow the disassembly procedure in the numerical order given.
Set
Power board
LED board, GE SW board, Mega bass SW board
Record/playback head (HRP101), Erase head (HE301),
                                                          Belt, Motor (M601)
Main board, MIC board, VOL board
Mechanism deck, Tuner board 
Cabinet (rear)
Cabinet (front)
Screws (3X4)
Power board
1
Tuner board
(CNP1)
4
2
6
Screws (3X4)
1
Screws (3X10)
5
Main board
   (CNP305)
3
Cabinet (front) 
Cabinet (rear) 
5
CFS-1085S
2-3. MAIN BOARD, MIC BOARD, VOL BOARD
2-2. LED BOARD, GE SW BOARD, MEGA BASS SW BOARD
Screw (2.6X8)
1
Screw (2.6X8)
1
Screws (2.6X8)
GE SW board
Bracket (B) board
Bracket (B) board
3
Screws (2.6X8)
6
5
7
2
4
LED board
Mega bass SW board
Cabinet (front)
Knob (job)
Screw (2.6X8)
1
Screw (2.6X8)
5
2
7
qg
qd
4
Lever (rec)
MIC board
Main board
Bracket (B) board
VOL board
Cabinet (front) 
Knob (VOL)
Screws (2.6X8)
qf
Claws
6
Screws (2.6X8)
3
CNP301
qs
CNP304
qa
CNP302
0
CNP303
9
CNP306
8
6
CFS-1085S
2-4. MECHANISM DECK, TUNER BOARD
2-5. RECORD/PLAYBACK HEAD (HRP101), ERASE HEAD (HE301), BELT, MOTOR (M601)
Screw (3X8)
Tuner board
0
qa
8
2
4
6
9
Screws (2.6X8)
3
Screws (2.6X8)
3
Screws (2.6X8)
5
Screws (2.6X8)
1
Screw (2.6X5)
7
Mechanism deck
Pointer chassis
Chassis
Pointer
Knob (tun)
Cabinet (front)
(HE301)
(HRP101)
Claws
Record / playback head
Erase head
Motor
(M601)
Belt
1
Claws
3
Screws (2.6X5)
5
7
4
2
6
7
CFS-1085S
2-6. DIAL POINTER INSTALLATION
PVC shaft
Chassis
Knob (tune)
Knob (tune)
Chassis
Window
Pointer
Pointer
Notch
Tuner board
MIN
(Fig-2)
MIN
Screw (2.6X5)
5
2
1
(Fig-1)
1
  Turn the PVC shaft fully counterclokwise.
2
  Place the pointer in the chassis groove.
3
  Line up the tip of the pointer with the notch in the chassis.
      (Fig-1)
4
  Attach so that the knob (Tune) is at the position shown in
      Fig-2.
5
  Fasten the knob (tune) to the PVC shaft with the screw.
8
CFS-1085S
3-2. ELECTRICAL ADJUSTMENTS
 TAPE  SECTION
Switch location
   FUNCTION switch................. TAPE (RADIO OFF)
   SOUND SELECT.................... FLAT
   VOLUME................................. mechanical center
   MEGA BASS............................ OFF
Test Tape
Type
Signal
Used for
WS-48B
3kHz, 0dB
Tape Speed Adjustment
3-1. MECHANICAL ADJUSTMENTS
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head demagnetizer close to the erase
head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power sup-
ply voltage (9V) unless otherwise noted.
1.Torque Measurement
Mode
Torque Meter
Meter Reading
2.95 – 6.86 mN•m
Playback
CQ-102C
(30 – 70 g•cm)
(0.42 – 0.97 oz•inch)
0.15 – 0.53 mN•m
Back Tension
CQ-102C
(1.5 – 5.5 g•cm)
(0.021 – 0.076 oz•inch)
5.4 – 13.2 mN•m
Rewind
CQ-201B
(55 – 135 g•cm)
Fast Forward
(0.77 – 1.87 oz•inch)
2. Tape Tension  Measurement
Mode
Torque Meter
Meter Reading
FWD
CQ-403A
more than 100g (3.53 oz)
SECTION 3
ADJUSTMENTS
 0dB = 0.775 V
9
CFS-1085S
Tape Speed Adjustment
Procedure :
    Mode : playback
Adjustment Values :
      Digital frequencycounter
               2,910 to 3,090Hz
Frequency difference between the begining and the end of the
tape should be within 1% (30Hz)
Adjustment Values :
tape speed adjustment
control inside motor
set
test tape
WS-48B
(3kHz, 0dB)
32
digital frequency
counter
phones jack
10
CFS-1085S
 TUNER  SECTION
 MW Section
Procedure :
BAND Switch
: MIN
FINE TUNE control
: mechanical center
 SW Section
Procedure :
BAND Switch
: SW1, SW2
FINE TUNE control
: mechanical center
 FM Section
Procedure :
BAND Switch
: FM
FINE TUNE control
: mechanical center
(
) : Saudi Arabia model
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455kHz
MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520kHz
CT4
1,680kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620kHz
CT3
1,400kHz
SW1 FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
2.2MHz
CT6
7.3MHz
SW1 TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
2.2MHz
Confirmation
7.3MHz
SW2 FREQUENCY COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L8
6.8MHz
CT8
22.5MHz
SW2 TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L7
6.8MHz
Confirmation
22.5MHz
FM FREQUENCY COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
86.5MHz (87.35MHz)
CT2
109.5MHz (107.8MHz)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
86.5MHz (87.35MHz)
CT1
109.5MHz (107.8MHz)
AM RF signal
generator
30% amplitude modulation by
 400Hz signal.
Output level : as low as possible
telescopic
antenna
terminal
12PF
Adjustment Location : Mechanism deck
Switch location
   FUNCTION switch................ TAPE (RADIO OFF)
   SOUND SELECT.................. FLAT
   VOLUME.............................. mechanical center
   MEGA BASS......................... OFF
TUNER SECTION
AM  RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
Put the lead-wire
antenna close to 
the set.
set
32
J301 (phones)
level meter
FM RF signal
generator
22.5kHz frequency deviation by 
1kHz signal.
Output level : as low as possible
telescopic
antenna
terminal
0.01
µ
F
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.

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