Read Sony ICF-M350V Service Manual online
SERVICE MANUAL
ICF-M350V
SUPPLEMENT-1
File this supplement with the service manual.
US Model
Subject: MAIN/KEY Board Modification
(ECN-TRB00055)
• Discrimination
– Cabinet (Rear) –
Applicable Serial No.
E1206994 and later.
E1206994 and later.
Ver 1.0 1999. 12
– 2 –
• FM/TV Tracking Adjustment
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
pacitors.
• Remove FM antenna in FM adjustment.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
AM VT VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L2
530 kHz
1.5
±
0.1 V
Confirmation
1,710 kHz
7 to 9 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
590 kHz
CT1
1,490 kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T201
10.7 MHz
FM VT VOLTAGE CONFIRMATION
Frequency Display
Reading on Digital Voltmeter
Confirmation
TV 2CH
0.9
±
0.2 V
Confirmation
108 MHz
9 to 11.5 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L203
TV 2CH
CT202
108 MHz
TV VT VOLTAGE CONFIRMATION
Frequency Display
Reading on Digital Voltmeter
Confirmation
Weather 2CH
0.7
±
0.2 V
Confirmation
TV 13CH
9.5 to 11.5 V
TV TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L202
Weather 2CH
CT201
TV 13CH
Adjustment Location: MAIN and KEY board (See page 3)
1.
ELECTRICAL ADJUSTMENTS
0 dB=1
µ
V
[AM]
Setting:
BAND: AM
BAND: AM
• AM IF Adjustment
• AM VT Voltage Adjustment
• AM Tracking Adjustment
[FM/TV]
Setting:
BAND: FM, TV or Weather
BAND: FM, TV or Weather
• FM IF Adjustment
• FM/TV VT Voltage Confirmation
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
4
Ω
MAIN board
TP2 (GND)
TP2 (GND)
MAIN board
TP14 (DET OUT)
TP14 (DET OUT)
digital voltmeter
100 k
Ω
TP13 (AM VT)
TP2 (GND)
+
–
–
MAIN board
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
4
Ω
MAIN board
TP (SP –)
TP (SP –)
MAIN board
TP (SP +)
TP (SP +)
FM RF signal
generator
KEY board
TP204 (FM IF)
KEY board
TP119 (GND)
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
deviation by 400 Hz
signal
Output level: as low as possible
+
–
–
level meter
MAIN board
TP (SP –)
TP (SP –)
MAIN board
TP (SP +)
TP (SP +)
set
4
Ω
0.01
µ
F
digital voltmeter
100 k
Ω
TP118 (FM VT)
TP119 (GND)
+
–
–
KEY board
FM RF signal
generator
KEY board
TP202 (FM/TV IN)
KEY board
TP201 (GND)
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
deviation by 400 Hz
signal
Output level: as low as possible
+
–
–
level meter
MAIN board
TP (SP –)
TP (SP –)
MAIN board
TP (SP +)
TP (SP +)
set
4
Ω
0.01
µ
F
ICF-M350V
– 3 –
– 4 –
– 5 –
2-1.
BLOCK DIAGRAM
2.
DIAGRAMS
Adjustment Location:
D205
L204
TV OSC
D206
L205
FM OSC
1
5
BAND-PASS
FILTER
BPF201
ANT1
FM/TV
TELESCOPIC
ANTENNA
TV
RF AMP
FM
RF AMP
TV IN
FM IN
+
15
TV RF
14
FM RF
12
FM OSC
11
FM OSC
9
MIX OUT
BUFFER
IF AMP
TV
OSC
FM
OSC
8
IF
OUT
6
MODE
SW
MODE
SWITCH
D203
L202
TV RF
CT201
CT201, L202
TV TRACKING
D204
L203
FM RF
CT202
CT202, L203
FM TRACKING
T201
MIX IFT
FM IF
FM/TV RF AMP, OSC, MIX, IF AMP
IC201
LEVEL
SHIFT
Q105
LEVEL
SHIFT
Q102
24
23
TV LOCAL IN
FM LOCAL IN
25
AM LOCAL IN
39
FM/TV BAND
SELECT SWITCH
Q203, 204
AM
FRONT-END
11
15
IF
OUT
AM RF
IN
IN
AM
OSC
OSC
AM FRONT-END
IC1 (2/2)
D2
CT1
L1
AM FERRITE-ROD
ANTENNA
AM TRACKING
CT1, L1
FREQUENCY
COVERAGE
L2
AM OSC
AM IF
T1
AM IFT
CF1
450kHz
17
3
CF4
IF AMP
Q201
CF201
10.7MHz
CF2
10.7MHz
18
FM
IF AMP
FM
IF AMP
TUNING
METER
FM
DISCRIMI-
NATOR
+
20
METER
16
BAND
AM
IF IN
IF IN
FM
DISCRI
DISCRI
FM
IF IN
IF IN
24
DET
HIGH-CUT
MUTE
Q2
25
Q1
TV/MW. FM
20
BEEP
27
PD OUT
19
MUTE
AF POWER
AMP
28
AF
OUT
AF
IN
IN
9
REG OUT
TU B+
FM/AM IF AMP, DET, AF AMP
IC1 (1/2)
4
5
NF
VOL
VOL
RV1
MUTING
Q3
J52
v
(EARPHONE)
SP51
(SPEAKER)
36
COMPARATOR
IC51 (2/2)
BATTERY CHECK
IC51 (1/2)
TU B+
MW/FM. TV
LOW-PASS
FILTER
Q101, 103, 104
DC/DC
CONVERTER
Q106, 107, T101
B+ SWITCH
(FOR FM/TV)
Q202, 205
2.4V
(FM/TV)
Q206
+2.4V
REGULATOR
IC53
4.5V
B+ SWITCH
Q55
38
RADIO POWER
ON/OFF
B+ SWITCH
Q56
+3V
REGULATOR
IC52
3V
D52
–
+
DC IN 4.5V
DRY BATTERY
SIZE “AA”
(IEC DESIGNATION R6)
3PCS. 4.5V
POWER ON/OFF
CONTROL
Q54
29
RESET SIGNAL
GENERATOR
IC102
D104
8 – 1, 56 – 51
LCD3 - LCD16
14 – 12
COM1 - COM3
44 – 42
KEY SCAN0-
KEY SCAN2
48 – 45
KEY RET0-
KEY RET3
LIQUID CRYSTAL
DISPLAY
LCD101
KEY MATRIX
S101-112
S103
5
S102
1
S109
–
S112
+
S108
3
S105
2
S101
CLOCK/
ENTER
S104
ALARM
S107
BAND/STANDBY
S110
KEY PROTECT
S102, 103, 105, 108, 111
PRESET TUNING
TIME SET
S111
4
S106
POWER
TUNE/
TIME
SYSTEM CONTROLLER,
LCD DRIVER, KEY CONTROL
IC101
• SIGNAL PATH
: TV
: FM
: AM
6
05
J51
CE
L1
CT1
L2
AM VT Voltage
Adjustment
T1
AM IF Adjustment
– MAIN BOARD (Component Side) –
AM Tracking Adjustment
TP (SP–)
– MAIN BOARD (Conductor Side) –
TP (SP+)
TP13 (AM VT)
TP2 (GND)
TP14 (DET OUT)
TP202 (FM/TV IN)
– KEY BOARD (Component Side) –
TP201 (GND)
TP204 (FM IF)
TP119(GND)
TP118 (FM VT)
CT202
– KEY BOARD (Conductor Side) –
L203
FM Tracking
Adjustment
T201
FM IF Adjustment
L202
CT201
TV Tracking
Adjustment
ICF-M350V
– 6 –
– 7 –
– 8 –
2-2.
SCHEMATIC DIAGRAM
•
See page 11 for Waveforms.
•
See page 11 for IC Block Diagrams.
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.
•
f
: internal component.
•
C
: panel designation.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 4.5 V and fed with regulated dc power
supply from battery terminal.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : AM
(
no mark : AM
(
) :FM/TV (2 to 6CH)
[
] : TV (7 to 13CH)/weather
• 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.
L
: TV
F
: FM
f
: AM
Note on Printed Wiring Boards:
•
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
x
: parts mounted on the conductor side.
•
W
: indicates side identified with part number.
•
z
: Through hole.
•
f
: internal component.
•
b
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side) the parts face are indicated.