Sony SRF-46 Service Manual ▷ View online
MICROFILM
SRF-46
Canadian Model
AEP Model
UK Model
E Model
SERVICE MANUAL
FM STEREO RADIO
SPECIFICATIONS
Frequency range
87.5 – 108 MHz
Output
2 (headphones) jack (stereo minijack)
load impedance 16 ohms
load impedance 16 ohms
Power output
4.3 mW + 4.3 mW (at 10% harmonic
distortion) with earphones having
impedance of 16 ohms
distortion) with earphones having
impedance of 16 ohms
Power requirements
1.5 V DC, one R6 (size AA) battery
Battery life
Using Sony SUM-3 battery
Approx. 35 hours
Dimensions
Approx. 63
×
92.9
×
25 mm
(w/h/d) (2
1
/
2
×
3
3
/
4
×
1 in)
(not incl. belt holder)
Mass
Approx. 53 g (1.9 oz) not incl, a battery
Accessories supplied
Stereo earphones (1)
Belt holder (1)
Belt holder (1)
Design and specifications are subject to change
without notice.
without notice.
– 2 –
SERVICING NOTES
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Parts Identification
Note:
Follow the disassembly procedure in the numerical order given.
MAIN BOARD
SECTION 2
DISASSEMBLY
1
two screws
(P2
(P2
×
8)
2
four claws
6
front cabinet
5
main board
4
screw
(BTP2.6
(BTP2.6
×
4)
2
two claws
This section is extracted from
instruction manual.
3
rear cabinet
SECTION 1
GENERAL
– 3 –
SECTION 3
DIAL SETTING
Note:
Follow the assembly procedure in the numerical order given.
3
main board
2
Turn CV1 fully in the
arrow direction
arrow direction
A
.
A
1
Mount the knob (TUNE)
as shown in the figure.
as shown in the figure.
front cabinet
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for maximum reading on level meter
L6
86.5 MHz (Except Italian)
87.35 MHz (Italian)
CT1
109.5 MHz (Except Italian)
108.25 MHz (Italian)
– 4 –
SECTION 4
ELECTRICAL ADJUSTMENT
Setting:
SENS switch: DX
FM STEREO (38 kHz) Adjustment
Setting:
SENS switch: DX
Procedure:
1. Connect 10
µ
F Capacitor to TP (38 kHz) and TP (GND).
2. Connect the frequency counter to TP (VCO).
3. Adjust L4 for 38 kHz
3. Adjust L4 for 38 kHz
±
20 Hz reading on the frequency counter.
Connection:
22.5 kHz frequency deviation
by 400 Hz signal.
Output level: as low as possible
by 400 Hz signal.
Output level: as low as possible
FM RF signal
generator
generator
0.01
µ
F
TP (RF IN)
• Repeat the procedures in each adjustment several times, and the
frequency coverage adjustments should be finaly done by the
timmer capacitors.
timmer capacitors.
2nd OSC Adjustment
Setting:
SENS switch: DX
Procedure:
1. Connect the frequency counter to TP (OSC).
2. Adjust L2 for 56.75 MHz
2. Adjust L2 for 56.75 MHz
±
0.25 MHz reading on the frequency
counter.
Connection:
frequency counter
1
µ
F/50 V
TP (OSC) (IC1
@¢
PIN)
+
+
–
• Adjustment Location: MAIN board
— Component Side—
S1
S3
L4
L2
L6
CT1
CV1
L4: FM STEREO
(38 kHz) ADJUSTMENT
L2: 2nd OSC
ADJUSTMENT
CT1: FM FREQUENCY
COVERAGE
ADJUSTMENT
ADJUSTMENT
L6: FM FREQUENCY
COVERAGE
ADJUSTMENT
ADJUSTMENT
f
min
f
min
— Conductor Side—
frequency counter
1
µ
F/50 V
TP (VCO) (IC1
!ª
PIN)
+
+
–
TP
(RF IN)
TP
(VCO)
TP
(OSC)
IC1
TP
(GND)
TP
(38 kHz)
+
10
µ
F
16 V
set
headphone jack (
2
)
level meter
16
Ω
+
–
–
