CFS-828S - Sony Audio Service Manual (repair manual)

Model
CFS-828S
Pages
34
Size
3.72 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cfs-828s.pdf
Date

View Sony CFS-828S Service Manual online

1
Model Name Using Similar Mechanism
NEW
Tape Transport Mechanism Type
MF-W828-117
SERVICE MANUAL
E Model
CFS-828S
RADIO CASSETTE-CORDER
Frequency range
FM:
EA model: 87.5 - 107 MHz/
E15, UAE model: 87.5 - 108 MHz
MW: EA model: 530 - 1,605 kHz/
E15, UAE model: 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: Telescopic
MW: Built-in ferrite bar
Recording system
4-track, 2-channel stereo
Frequency response
80 - 12,500 Hz
Speakers
Full range: 10 cm (4 inches) dia., 6 
Ω, cone type/
Tweeter: 2 cm (
13/16
 inches) dia.
Output
Headphones jack (stereo minijack), for 16 - 68 
impedance headphones
Maximum Power output
9W
SPECIFICATIONS
Battery life
FM Recording: Sony R20P: Approx. 9 hours/
Sony LR20 alkaline: Approx. 23 hours
Playback: Sony R20P: Approx. 3 hours/
Sony LR20 alkaline: Approx. 8 hours
Power requirements
110 - 120 V/220 - 240 V AC selectable, 50/60 Hz
9 V DC, six R20 (size D) batteries
Power consumption
AC 18 W
Dimensions
Approx. 679 
× 263.5 × 239.5 mm (w/h/d)
(26 
6/8
 
× 10 
3/8
 
× 9 
4/9
 inches) incl. projecting parts
and controls, not incl. handle
Mass
Approx. 7.3 kg (16 lb 1 oz) incl. batteries
Supplied accessory
AC power cord (1)
Design and specifications are subject to change without
notice.
• Abbreviation
E15
: AC 220-240V area in E model
EA
: Saudi Arabia model
UAE : United Arab Emirates model
Ver 1.0  2001.11
9-873-410-01
2001K0400-1
© 2001.11
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
2
TABLE OF CONTENTS
1. GENERAL
............................................................................ 3
2. DISASSEMBLY
2-1.   Cabinet (Rear) Assy ............................................................ 4
2-2.   Power Board ........................................................................ 5
2-3.   Mechanism Deck ................................................................. 5
2-4.   H/P, LED2, Maxi Bass, VOL and Main Boards .................. 6
2-5.   F/T and Tuner Boards .......................................................... 6
2-6.   Jog and LED1 Boards ......................................................... 7
2-7.   REC SW Board, Belt and Motor Assy (W) (M301) ........... 7
3. DIAL POINTER SETTING
............................................. 8
4. MECHANICAL ADJUSTMENTS
................................. 9
5. ELECTRICAL ADJUSTMENTS
Tape Section ............................................................................ 9
Tuner Section ......................................................................... 10
6. DIAGRAMS
6-1.   Circuit Boards Location .................................................... 12
6-2.   Block Diagram .................................................................. 13
6-3.   Printed Wiring Boards – Tuner Section – ......................... 14
6-4.   Schematic Diagram – Tuner Section – .............................. 15
6-5.   Printed Wiring Boards – Main Section – .......................... 16
6-6.   Printed Wiring Boards – Power Section – ......................... 17
6-7.   Schematic Diagram – Main Section (1/2) – ...................... 18
6-8.   Schematic Diagram – Main Section (2/2) – ...................... 19
7. EXPLODED VIEWS
7-1.   Cabinet (Rear) Section ...................................................... 21
7-2.   Cabinet (Front) Section-1 .................................................. 22
7-3.   Cabinet (Front) Section-2 .................................................. 23
7-4.   Mechanism Deck Section-1 .............................................. 24
7-5.   Mechanism Deck Section-2 .............................................. 25
7-6.   Mechanism Deck Section-3 .............................................. 26
7-7.   Speaker Section ................................................................. 27
8. ELECTRICAL PARTS LIST
......................................... 28
SAFETY-RELATED  COMPONENT  WARNING!!
COMPONENTS  IDENTIFIED  BY  MARK  0  OR  DOTTED  LINE
WITH  MARK  
0  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.
Notes on Chip Component Replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
CFS-828S
3
CFS-828S
SECTION 1
GENERAL
This section is extracted
from instruction manual.
VOLUME
MIC
OPR/BATT
FUNCTION
FINE TUNING
TUNING
BAND
Deck A
Deck B
PHONES
ISS (rear)
SOUND SELECT
MAXI BASS
VOLTAGE
SELECTOR
(rear)
Location of controls
4
CFS-828S
• The equipment can be removed using the following procedure.
SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (REAR) ASSY
2-1. CABINET (REAR) ASSY
(Page 4)
2-2. POWER BOARD
(Page 5)
SET
2-6. JOG AND LED1
BOARDS
(Page 7)
2-4. H/P, LED2, MAXI BASS,
VOL AND MAIN BOARDS
(Page 6)
2-5. F/T AND TUNER BOARDS
(Page 6)
2-3. MECHANISM DECK
(Page 5)
2-7. REC SW BOARD, BELT AND 
MOTOR ASSY (W) (M301)
(Page 7)
2
 BVTP 3x16
3
 BVTP 3x16
4
 BVTP 3x16
5
 cabinet (rear) assy
6
 CNP311
7
 CNP1
1
 lid, battery case
5
CFS-828S
2-2. POWER BOARD
2-3. MECHANISM DECK
1
 BVTP 3x10
3
 BVTP 3x10
4
 BVTP 3x10
5
 BVTP 3x10
6
 POWER board
cabinet (rear) assy
2
 plate (T), shield
3
 BVTP 3x10
4
 BVTP 3x10
8
 CNP316
qs
 CNP302
qa
 CNP301
9
 CNP306
0
 CNP305
7
 CNP315
5
 BVTP 3x10
6
 mechanism deck
1
2
6
CFS-828S
2-5. F/T AND TUNER BOARDS
2-4. H/P, LED2, MAXI BASS, VOL AND MAIN BOARDS
1
 knob (VOL)
qs
 claws
claws
claws
2
 BVTP 3x10
5
 BVTP 3x10
qh
 VOL board
7
 BVTP 3x10
qa
 BVTP 3x10
qd
 MAIN board
8
 retainer board
9
 MAXI BASS board
0
 button (MAXI BASS)
6
 LED2 board
qg
 CNP307
qf
 CNP417
3
 retainer board
4
 H/P board
2
 BVTP 3x10
1
 knob
     (FINE TUNING)
4
 BVTP 3x10
5
 BVTP 3x10
7
 BVTP 3x10
qa
 knob (BAND)
9
 P 2.6x4
8
 TUNER board
0
 gear (VC)
6
 chassis (TUNE)
3
 F/T board
7
CFS-828S
2-7. REC SW BOARD, BELT AND MOTOR ASSY (W) (M301)
2-6. JOG AND LED1 BOARDS
4
 BVTP 3x10
5
 LED1 board
6
 window (LED)
2
 BVTP 3x10
3
 JOG board
1
 dial, jog
3
 PTT 2x5
1
 PTT 2x6
2
 REC SW board
4
 PTT 2x5
0
 screw, motor
deck A
deck B
5
 PTT 2x5
qa
 motor assy (W) (M301)
6
 chassis (SUB)
7
 belt
8
 belt
9
 rever (REC)
8
CFS-828S
SECTION 3
DIAL POINTER SETTING
UP
pointer
knob (TUNE) assy
knob (TUNE) assy
1
 pointer
2
 knob (TUNE) assy
3
 gear, midway
gear, midway
4
 PTPWH 3x10
4
 TUNER board
8
 F/T board
1
 gear (VC)
2
5
 BVTP 3x10
3
6
 BVTP 3x10
7
 BVTP 3x10
9
 BVTP 3x10
9
CFS-828S
PRECAUTION
1. Clean the following parts with a denatured alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
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. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
6. Power supply voltage: 9 V dc.
Torque Measurement   DECK A     DECK B
Mode
Torque meter
Meter reading
2.21 to 5.39 mN • m
Forward
CQ-102C
22.5 to 55 g • cm
(0.31 to 0.76 oz • inch)
Forward
0.20 to 0.49 mN • m
back tension
CQ-102C
2 to 5 g • cm
(0.03 to 0.07 oz • inch)
Fast Forward
5.89 to 11.76 mN • m
and
CQ-201B
60 to 120 g • cm
Rewind
(0.83 to 1.67 oz • inch)
Tape Tension Measurement   DECK A     DECK B
Mode
Tension meter
Meter reading
Forward
CQ-403A
more than 150 g
(more than 5.29 oz)
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS
  TAPE SECTION     0 dB = 0.775 V
Standard Output Level
Output terminal
SP OUT
PHONES OUT
load impedance
32 
output signal level
0.775 V (0 dB)
0.25 V (–10 dB)
Test Tape
Tape
Signal
Used for
WS-48A
3 kHz, 0 dB
tape speed adjustment
Tape Speed Adjustment   DECK A     DECK B
Procedure:
• Perform normal speed adjustment before high speed check.
Mode: playback (deck A)
record (deck B)
Deck
Tape
Adjustment
Frequency
speed
point
counter
A
Normal (playback)
RV302
3,000 to 3,030 Hz
A
HI-SPEED DUBBING
(confirmation) 5,300 to 6,300 Hz
(playback)
B
HI-SPEED DUBBING
———
———
(record)
Frequency difference between the beginning and the end of the
tape should be within ± 1.0% (both Normal and Hi-speed).
Adjustment Location: – main board (component side) –
PHONES jack (J301)
set
32 
test tape
WS-48A
(3 kHz, 0 dB)
digital frequency
counter
Adjust RV301 so that reading on digital frequency counter
becomes 3,000 Hz.
Specification Value:
RV302
– MAIN board (component side) –
10
CFS-828S
Adjustment Location: See page 11
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
L9
10.7 MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
87.35 MHz (EA model)
86.5 MHz (E15, UAE model)
CT2
107.8 MHz (EA model)
109.5 MHz (E15, UAE model)
FM TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
87.35 MHz (EA model)
86.5 MHz (E15, UAE model)
CT1
107.8 MHz (EA model)
109.5 MHz (E15, UAE model)
MW IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455 kHz
MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
516 kHz (EA model)
520 kHz (E15, UAE model)
CT4
1,635 kHz (EA model)
1,680 kHz (E15, UAE model)
MW TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
600 kHz
CT3
1,400 kHz
SW1 FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
2.2 MHz
CT6
7.3 MHz
SW1 TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
2.2 MHz
< confirmation >
7.3 MHz
SW2 FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L8
6.8 MHz
CT8
22.5 MHz
SW2 TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L7
6.8 MHz
< confirmation >
22.5 MHz
  TUNER SECTION     0 dB = 1 µV
Common Setting:
SOUND SELECT control: FLAT
VOLUME control: MAX
MAXI BASS switch: OFF
• FM Section
BAND switch: FM
• MW Section
BAND switch: MW
FINE TUNING (RV2): mechanical center
• SW1/SW2 Section
BAND switch: SW1 or SW2
FINE TUNING (RV2): mechanical center
• Common Connecting Level Meter
telescopic
antenna terminal
0.01
µF
FM RF signal
generator
75kHz frequency deviation
by 1kHz signal
Output level: as low as possible
set
Put the lead-wire
antenna close to
the set.
AM RF signal
generator
400Hz, 30% 
AM modulation
Output level: as low as possible
telescopic
antenna terminal
12pF
AM RF signal
generator
400Hz, 30% 
AM modulation
Output level: as low as possible
set
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
PHONES jack (J301)
set
32 
level meter
(range: 0.5–5 V ac)

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