Sony ICF-C900HS Service Manual ▷ View online
– 16 –
• Waveform
1
IC2
!™
(XTIN)
1 V/DIV, 20 µs/DIV
• IC Block Diagram
IC1
CXA1019S
1
2
3
4
5
6
7
8
9
10
15
14
13
12
11
FM
DISCRIMINATOR
AF POWER AMP
AM FE
FM IF
TUNING
METER
AM IF DET AGC
FM FE
23
22
21
20
24
25
19
18 17 16
29 28 27 26
30
GND
GND
AF OUT
VCC
RIPPLE
FIL
TER
AF IN
DET OUT
AFC AGC
AFC AGC
IF GND
METER
N.C
FM IF IN
AM IF IN
FM/AM BAND
SELECT
FM/AM
IF OUT
FE GND
N.C
AM RF IN
FM RF
REG OUT
FM OSC
FM RF IN
AFC
AM OSC
VOL
NF
FM DISCRI
GND
GND
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
¢
: internal component.
•
4
: micro-strip line.
•
C
: panel designation.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
no mark : FM
(
) : AM
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: FM
f
: AM
Note:
The components identi-
fied by mark
The components identi-
fied by mark
!
or dotted
line with mark
!
are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
!
sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
3 Vp-p
32.768 kHz
– 17 –
•
MAIN BOARD IC2 LC587206A-1L77 (SYSTEM CONTROLLER, KEY CONTROL, LCD DRIVER)
Pin No.
Pin Name
I/O
Function
1
RES
I
Reset signal input terminal
2
INT
I
Initialize input terminal
3
SO1
I
RANDOM switch (SW2) input terminal “L”: off, “H”: on
4
SO2
I
Not used (fixed at “L”)
5
SO3
I
ALARM dial input terminal
6
SO4
I
ALARM dial input terminal
7
P1
I
8
P2
I
PROGRAM LIGHT CONTROL dial input terminal
9
P3
I
10
P4
I
Not used (fixed at “L”)
11
XTOUT
O
Sub system clock (for slow mode) output terminal (32.768 kHz)
12
XTIN
I
Sub system clock (for slow mode) input terminal (32.768 kHz)
13
VDD2
—
Power supply terminal for the liquid crystal display drive
14
VDD1
—
Power supply terminal for the liquid crystal display drive
15
VSS
—
Ground terminal
16
VDD
—
Power supply terminal (+4V)
17
CFIN
I
Main system clock (for fast mode) input terminal (2 MHz)
18
CFOUT
O
Main system clock (for fast mode) output terminal (2 MHz)
19
S1
I
Not used (fixed at “L”)
20
S2
I
Not used (fixed at “L”)
21
S3
I
AC detection signal input terminal
22
S4
I
Not used (fixed at “L”)
23
K1
I
24
K2
I
25
K3
I
26
K4
I
27
M1
I
28
M2
I
29
M3
I
30
M4
I
31
POWER
O
Tuner system power supply on/off control signal output “H”: tuner on
32
MUTE
O
Muting on/off control signal output “L”: muting on
33
DATA
O
Carrier signal output for the light control module
34
ALM
O
Alarm pulse signal output to the CXA1019S (IC1)
35
TST
I
Test terminal (connected to ground)
36
KS1
O
37
KS2
O
Key send signal output to the key matrix
38
KS3
O
39
SEG4
O
40
SEG5
O
41
SEG6
O
42
SEG7
O
Segment drive signal output terminal Not used (pull down)
43
SEG8
O
44
SEG9
O
45
SEG10
O
46
SEG11
O
Alarm drive control signal output terminal
47
SEG12
O
Segment drive signal output terminal Not used (pull down)
Key return signal input from the key matrix
ID code dial input terminal
4-4.
IC PIN FUNCTION DESCRIPTION
– 18 –
Pin No.
Pin Name
I/O
Function
48
SEG13
O
49
SEG14
O
50
SEG15
O
51
SEG16
O
52
SEG17
O
53
SEG18
O
Segment drive signal output to the liquid crystal display (LCD1)
54
SEG19
O
55
SEG20
O
56
SEG21
O
57
SEG22
O
58
SEG23
O
59
COM4
O
60
COM3
O
61
COM2
O
62
COM1
O
63
CUP1
—
64
CUP2
—
Common drive signal output to the liquid crystal display (LCD1)
Terminal for doubler circuit capacitor connection to develop liquid crystal display drive voltage
– 19 –
SECTION 5
EXPLODED VIEWS
Les composants identifiés par une
marque
marque
! sont critiquens pour la
sécurité.
Ne les remplacer que par une pièce
portant le numéro spécifié.
Ne les remplacer que par une pièce
portant le numéro spécifié.
The components identified by
mark
mark
! or dotted line with mark
! are critical for safety.
Replace only with part number
specified.
specified.
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference num-
ber in the exploded views are not supplied.
• Accessories and packing materials are given
in the last of the electrical parts list.
NOTE:
• -XX and -X mean standardized parts, so they
may have some difference from the original
one.
one.
• Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
KNOB, BALANCE (WHITE) . . . (RED)
↑
↑
Parts Color Cabinet's Color
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
(1)
CABINET (UPPER) SECTION
1
3-022-507-01 KNOB (ALARM)
2
3-022-527-01 SPRING, LEAF
3
3-029-249-01 RUBBER, CLICK
4
3-022-506-01 KNOB (LIGHT CONTROL)
5
7-671-155-01 STEEL BALL 3.0
6
3-022-520-01 PLATE (A), ORNAMENTAL
7
3-022-508-01 KNOB (SELECT)
8
3-022-519-01 BUTTON (A/L) (A. B)
9
3-022-519-11 BUTTON (A/L) (1. 2)
10
3-022-434-01 CABINET (UPPER)
11
3-022-439-01 SCALE, DIAL
12
3-022-436-01 BUTTON (MAIN)
13
3-368-852-01 FOOT
14
7-685-551-14 SCREW +BTP 3X20 TYPE2 N-S
! PC1
1-769-339-22 CORD, POWER (E)
! PC1
1-783-817-11 CORD, POWER (US, Canadian)
1
4
6
9
7
13
13
14
14
2
3
5
7
10
11
12
A
A
8
US, Canadian
E
PC1
PC1
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