ICF-C253 - Sony Audio Service Manual (repair manual)

Model
ICF-C253
Pages
12
Size
1.13 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-c253.pdf
Date

View Sony ICF-C253 Service Manual online

ICF-C253
Australian Model
SERVICE MANUAL
FM/AM PLL SYNTHESIZED CLOCK RADIO
SPECIFICATIONS
Ver 1.1  2002. 03
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
9-927-909-12
2002C1600-1
© 2002.03
— 2 —
SECTION 1
GENERAL
This section is extracted
from instruction manual.
1.
Check the area of your repair for unsoldered or poorly-soldered
connections.  Check the entire board surface for solder splashes
and bridges.
2.
Check the interboard wiring to ensure that no wires are
"pinched" or contact high-wattage resistors.
3.
Look for unauthorized replacement parts, particularly
transistors, that were installed during a previous repair.  Point
them out to the customer and recommend their replacement.
4.
Look for parts which, through functioning, show obvious signs
of deterioration.  Point them out to the customer and
recommend their replacement.
5.
Check the B+ voltage to see it is at the values specified.
6.
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
SAFETY CHECK-OUT
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer.
— 3 —
SECTION 2
DISASSEMBLY
Note :
Follow the disassembly procedure in the numerical order given.
 The equipment can be removed using the following procedure.
Key board
Cabinet (upper) 
Set
Main board
Power board
2-1.
CABINET (UPPER)
2
 Cabinet (upper)
4
 Speaker
3
Remove the two solderings.
1
1
 Five screws (M3
 
×
 14)
— 4 —
2-2.
KEY BOARD
1
 Two claws
5
 Two claws
2
 Two claws
6
 Chassis
4
Key board
3
Remove the eight solderings.
7
Cabinet (lower)
2-3.
MAIN BOARD
8
Main board
6
LED board
3
Alarm dial board
4
Claw
7
Remove the four solderings.
5
Remove the four solderings.
1
Remove the
five solderings.
2
 Two screws (BTP 2
 
×
 8)
SECTION  3
ELECTRICAL  ADJUSTMENTS
[FM]
Setting:
BAND switch: FM
[AM]
Setting:
BAND switch: AM
Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.
FM  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT3
87.5 MHz
108 Hz
AM FREQUENCY  COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
  L1
  531 kHz
AM  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT1
621 kHz
1,404 kHz
AM  IF  ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
• Adjusting Location: MAIN board (Component Side)
+
FM RF signal generator
 22.5 kHz frequency
deviation by 400 Hz
signal
FM lead wire antenna terminal
speaker terminal
0.01 
µ
F
set
level meter
+
AM RF SSG
Put the lead-wire
antenna close to
the set.
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
set
speaker terminal
level meter
2-4. POWER BOARD
7
Power board
2
Terminal
4
Power cord
3
Remove the
two solderings.
5
Remove the
six solderings.
6
Transformer
power
1
— 5 —
— 6 —
T1 AM IF adjustment
FM TRACKING adjustment
L1 AM FREQUENCY COVERAGE 
adjustment
AM TARCKING adjustment
CT3
L3
CT1
L4
2-5. POWER CORD SETTING
FM antenna
Power board
Set the power cord as illustrated below,
then install the lower cabinet.
power cord
lower cabinet
ICF-C253
— 7 —
— 8 —
SECTION  4
DIAGRAMS
4-1.
PRINTED  WIRING  BOARDS
Note on Printed Wiring Boards:
• X
: parts extracted from the component side.
• b
: Pattern from the side which enables seeing.
KEY BOARD
POWER BOARD
LED BOARD
MAIN BOARD
1-676
-852-
1-676-851-
11
(11)
11
(11)
1-676-850-
11
(11)
1-676-849-
11
(11)
A
A
C30
C9
C19
C24
C10
C25
C108
C156
C157
C158
E
CF1
CF2
CF3
X100
15
28
1
14
1
1
1
5
4
1
8
3
2
FM
ANTENNA
BPF1
VR1
VOL
CT1
CT3
C8
T1
L3
L1
L4
AM FERRITE-ROD
ANTENNA
K
K
E
D5
D100
D155
D154
D152
D153
D101
D151
D6
D7
D8
D9
D10
Q151
W200
W151
E
E
E
E
1
14
15
28
29
42
43
56
LCD100 (LIQUID CRYSTAL DISPLAY)
E
CN150
1
3
CN2
1
3
W2
1
4
W150
CN201
E
E
HI
LOW
S1 BRIGHTNESS
H
L
1
8
CN200
B
A
ALARM
MODE
T150
POWER
TRANSFORMER
 P150
AC IN
S213
CLOCK
S210
DST
S209
M5
S208
M4
S204
ON
S202
OFF
S207
M3
S206
M2
S205
M1
S200
S201
S203
BAND
S211
SNOOZE
S212
A-RESET
S214
S215
SP1
(SPEAKER)
1
2
A
B
C
D
E
F
3
4
5
6
7
8
9
10
TO
ALARM
DIAL
16
TIME
TIME
TUNING
D5-D8
BACK LIGHT
Ref. No.
Location
D5
E-8
D6
E-7
D7
E-6
D8
E-5
D9
E-3
D10
E-3
D100
D-5
D101
D-5
D151
D-4
D152
D-4
D153
D-4
D154
C-4
D155
C-4
D156
IC1
C-8
IC100
E-6
Q2
C-7
Q3
B-8
Q6
E-9
Q7
D-6
Q8
D-6
Q9
E-4
Q10
E-4
Q100
E-5
Q101
E-5
Q151
C-6
• Semiconductor
Location
ICF-C253
— 9 —
— 10 —
4-2.
SCHEMATIC  DIAGRAM
 C116
0.1
TO ALARM DIAL
TUNING
TUNING
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted.  pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
 and 
1
/
4
 
W or less unless otherwise
specified.
f
: internal component.
C
: panel designation.
U
: B+ Line.
H
: adjustment for repair.
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : FM
(
) : AM
: Impossible to measure
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F
: FM
f
: AM
The components identified by mark 
0
 or dotted
line with mark 
0
 are critical for safety.
Replace only with part number specified.
• Waveform
2Vp-p
1
 IC100 
wf
 (XOUT)
1V/div
14
µ
sec
10
µ
sec/div
— 11 —
4-3.
IC PIN FUNCTION DESCRIPTION
• IC100  LCD CONTROL (
µ
PD17072GB-019-1A7)
Pin No.
1
2
3
4
5
6 to 9
10 to 13
14
15 to 17
18
19
20
21
22
23
24
25
26
27
28, 29
30
31 to 34
35 to 47
48, 49
50
51
52
53
54 to 56
I/O
O
O
O
O
O
O
I
I
Ι
O
I
I

O
I



O
O
O
I
I
O
O
I
Description
Initialization output.
Mute output.
Band output.
ALARM A indicator.
ALARM B indicator.
Key strove signal.
Key return signal.
ALARM-TIME input.
DIAL signal.
Ground.
PLL error output.
LW/MW VCO input.
FM VCO input.
Regulator.
VDD
System clock output.
System clock input.
Regulator.
LCD bubbler.
LCD drive.  Common signal.
LCD drive.  Segment signal.
Not used.
Power failure detection.
Not used.
Buzzer output.
Band output.
Initialization input.
Pin Name
INT OUT
MUTE
BAND1
ALARM A
ALARM B
KS0  to KS3
XR0 to XR3
P0
P1 to P3
GND
E0
VCOL
VCOH
Vreg0
VDD
Xout
Xin
Vreg1
VLCD0
CAP0, CAP1
VLCD1
COM0 to COM3
LCD0 to LCD12
LCD13, LCD14
CE
INT
BEEP
BAND2
INIT IN
MEMO
— 12 —
Ref. No.
Part No.
Description
Remarks
Ref. No.
Part No.
Description
Remarks
SECTION 5
EXPLODED VIEWS
1
3-045-666-11 CABINET (UPPER)
2
3-045-669-01 KNOB(ALARM)
3
3-045-670-11 BUTTON (ALARM)
4
3-045-668-11 BUTTON (MAIN)
5
7-685-647-79 SCREW+P   3X10 TYPE2 NON-SLIT
6
3-045-675-01 PANEL, FRONT
7
X-3378-799-1 PANELASSY, FRONT
8
3-049-387-01 SHEET(WINDOW), ADHESIVE
9
3-045-677-01 WINDOW (LED)
10
3-045-672-01 CHASSIS
* 11
A-3683-190-A MAIN BOARD, COMPLETE
12
3-933-547-01 SHEET (BAND)
13
3-919-268-01 KNOB(VOL)
14
3-045-667-11 CABINET (LOWER)
15
3-368-852-01 FOOT
16
7-685-649-79 SCREW +P   3X14 TYPE2 NON-SLIT
17
3-371-765-21 SCREW (2X8), +BTP
18
1-553-856-00 SWITCH, KEYBOARD
* 19
1-676-851-11 POWER BOARD
* 20
1-535-771-11 TERMINAL
21
A-3638-829-A DIAL (ALARM) ASSY
22
1-676-850-11 KEY BOARD
23
1-676-852-11 LED BOARD
SP1
1-504-748-21 SPEAKER (6.6cm)
0 P150
1-790-431-11 CORD, POWER
0 T150
1-435-504-11 TRANSFORMER, POWER
NOTE:
-XX, -X mean standardized parts, so they may
have some differences from the original one.
Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering these
items.
The mechanical parts with no reference number
in the exploded views are not supplied.
Accessories and packing materials are given in
the last of this parts list.
The components identified by mark 
0
  or
dotted line with mark 
0
 are critical for safety.
Replace only with part number specified.
1
not supplied
P150
T150
2
3
4
5
6
7
10
22
11
12
13
14
15
16
16
8
19
20
9
18
17
SP1
23
21
Ver 1.1  2002.03
Ref. No.
Part No.
Description
Remarks
Ref. No.
Part No.
Description
Remarks
— 13 —
SECTION 6
ELECTRICAL PARTS LIST
NOTE:
Due to standardization, replacements in the
parts list may be different from the parts
specified in the diagrams or the components
used on the set.
-XX, -X mean standardized parts, so they
may have some difference from the original
one.
Items marked “*” are not stocked since they
are seldom required for routine service.
Some delay should be anticipated when
ordering these items.
CAPACITORS:
uF: µF
RESISTORS
All resistors are in ohms.
METAL: metal-film resistor
METAL OXIDE: Metal Oxide-film resistor
F: nonflammable
COILS
uH: µH
The components identified by mark 
0
 or
dotted line with mark 
0
 are critical for safety.
Replace only with part number specified.
SEMICONDUCTORS
In each case, u: µ, for example:
uA...: µA... , uPA... , µPA... ,
uPB... , µPB... , uPC... , µPC... ,
uPD..., µPD...
When indicating parts by reference number,
please include the board name.
1-676-850-11 KEY BOARD
*********
< CONNECTOR >
* CN200
1-580-187-11 SOCKET, CONNECTOR 8P
< JUMPER >
JC200
1-216-296-91 SHORT
0
< SWITCH >
S200
1-692-014-11 SWITCH, KEY BOARD (+)
S201
1-692-014-11 SWITCH, KEY BOARD (-)
S202
1-692-014-11 SWITCH, KEY BOARD (OFF)
S203
1-692-014-11 SWITCH, KEY BOARD (BAND)
S204
1-692-014-11 SWITCH, KEY BOARD (ON)
S205
1-692-014-11 SWITCH, KEY BOARD (M1)
S206
1-692-014-11 SWITCH, KEY BOARD (M2)
S207
1-692-014-11 SWITCH, KEY BOARD (M3)
S208
1-692-014-11 SWITCH, KEY BOARD (M4)
S209
1-692-014-11 SWITCH, KEY BOARD (M5)
S210
1-692-014-11 SWITCH, KEY BOARD (D.S.T)
S211
1-692-014-11 SWITCH, KEY BOARD (SNOOZE)
S212
1-692-014-11 SWITCH, KEY BOARD (A-RESET)
S213
1-692-014-11 SWITCH, KEY BOARD (CLOCK)
S214
1-692-014-11 SWITCH, KEY BOARD (TIME +)
S215
1-692-014-11 SWITCH, KEY BOARD (TIME -)
************************************************************
1-676-852-11 LED BOARD
*********
< DIODE >
D9
8-719-079-31 LED   SLI-342YCT32-RS (B)
D10
8-719-079-31 LED   SLI-342YCT32-RS (A)
************************************************************
*
A-3683-190-A MAIN BOARD, COMPLETE
*********************
< FILTER >
BPF1
1-236-022-11 FILTER, BAND PASS
< CAPACITOR >
C3
1-163-251-11 CERAMIC CHIP
100PF
5%
50V
C4
1-163-141-00 CERAMIC CHIP
0.001uF
5%
50V
C5
1-163-021-91 CERAMIC CHIP
0.01uF
10%
50V
C6
1-163-227-11 CERAMIC CHIP
10PF
0.50PF 50V
C7
1-163-141-00 CERAMIC CHIP
0.001uF
5%
50V
C8
1-126-964-11 ELECT
10uF
20%
50V
C9
1-126-963-11 ELECT
4.7uF
20%
50V
C10
1-126-964-11 ELECT
10uF
20%
50V
C11
1-163-085-00 CERAMIC CHIP
2PF
50V
C13
1-163-021-91 CERAMIC CHIP
0.01uF
10%
50V
C14
1-163-809-11 CERAMIC CHIP
0.047uF
10%
25V
C15
1-164-489-11 CERAMIC CHIP
0.22uF
10%
16V
C17
1-163-021-91 CERAMIC CHIP
0.01uF
10%
 50V
C18
1-163-021-91 CERAMIC CHIP
0.01uF
10%
 50V
C19
1-128-551-11 ELECT
22uF
20%
25V
C20
1-163-021-91 CERAMIC CHIP
0.01uF
10%
 50V
C21
1-163-231-11 CERAMIC CHIP
15PF
5%
50V
C23
1-163-132-00 CERAMIC CHIP
430PF
5%
50V
C24
1-126-960-11 ELECT
1uF
20%
50V
C25
1-126-934-11 ELECT
220uF
20%
10V
C27
1-163-021-91 CERAMIC CHIP
0.01uF
10%
50V
C28
1-109-982-11 CERAMIC CHIP
1uF
10%
10V
C29
1-109-982-11 CERAMIC CHIP
1uF
10%
10V
C30
1-126-934-11 ELECT
220uF
20%
10V
C31
1-163-021-91 CERAMIC CHIP
0.01uF
10%
50V
C32
1-163-009-11 CERAMIC CHIP
0.001uF
10%
50V
C33
1-110-501-11 CERAMIC CHIP
0.33uF
10%
16V
C34
1-163-125-00 CERAMIC CHIP
220PF
5%
50V
C35
1-163-009-11 CERAMIC CHIP
0.001uF
10%
50V
C37
1-163-021-91 CERAMIC CHIP
0.01uF
10%
50V
C38
1-163-259-91 CERAMIC CHIP
220PF
5%
50V
C39
1-163-009-11 CERAMIC CHIP
0.001uF
10%
50V
C100
1-163-133-00 CERAMIC CHIP
470PF
5%
50V
C101
1-163-133-00 CERAMIC CHIP
470PF
5%
50V
C102
1-163-133-00 CERAMIC CHIP
470PF
5%
50V
C103
1-163-133-00 CERAMIC CHIP
470PF
5%
50V
C104
1-163-009-11 CERAMIC CHIP
0.001uF
10%
50V
C105
1-163-133-00 CERAMIC CHIP
470PF
5%
50V
C106
1-163-133-00 CERAMIC CHIP
470PF
5%
50V
C107
1-163-133-00 CERAMIC CHIP
470PF
5%
50V
C108
1-126-916-11 ELECT
1000uF
20%
6.3V
C109
1-163-038-91 CERAMIC CHIP
0.1uF
25V
C110
1-164-346-11 CERAMIC CHIP
1uF
16V
C111
1-163-108-00 CERAMIC CHIP
43PF
5%
50V
C112
1-163-233-11 CERAMIC CHIP
18PF
5%
50V
C113
1-163-021-91 CERAMIC CHIP
0.01uF
10%
50V
C114
1-163-038-91 CERAMIC CHIP
0.1uF
25V
C115
1-163-038-91 CERAMIC CHIP
0.1uF
25V
C116
1-163-038-91 CERAMIC CHIP
0.1uF
25V
C118
1-163-022-00 CERAMIC CHIP
0.012uF
10%
50V
LED
MAIN
KEY

Download Sony ICF-C253 Service Manual (Repair Manual)

Here you can view online and download Sony ICF-C253 Service Manual in PDF. ICF-C253 service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony ICF-C253 Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.