Sony SRFHM-01-V Service manual
SRF-HM01V
Time display: 12-hour system
Frequency range:
Band Range Channel step
TV 2 - 13 ch 1 channel
WEATHER 1 - 7 ch 1 channel
FM 87.5 - 108 MHz 0.1 MHz
AM 530 - 1 710 kHz 10 kHz
531 - 1 710 kHz 9 kHz
Headphone type: Dynamic
Power output: 7 mW + 7 mW (at 10 % harmonic distortion)
Power requirements: 1.5V DC, one size AAA (R03) battery
Mass: Approx. 136 g (4.7 oz) incl. a battery
Design
Supplied accessories: Operating instructions
and specifications are subject to change without notice.
Battery Life (Approx. hours) (JEITA*)
TV WEATHER FM AM
Sony alkaline size AAA (LR03) battery 33 33 37 57
Sony size AAA (R03) battery 14 14 16 26
* Measured by JEITA (Japan Electronics and Information Technology
Industries Association) standards.
The actual battery life may vary depending on the circumstance of the
unit.
SERVICE MANUAL
Ver 1.0 2002.02
SPECIFICATIONS
US Model
9-873-563-01 Sony Corporation
2002B0500-1 Personal Audio Company
C 2002.02 Published by Sony Engineering Corporation
PLL SYNTHESIZED HEADPHONE RADIO
TV/WEATHER/FM STEREO/AM
SRF-HM01V
TABLE OF CONTENTS
1. GENERAL ................................................................... 3
2. DISASSEMBLY
2-1. Disassembly Flow ........................................................... 4
2-2. MICROCOMPUTER Board ........................................... 4
2-3. MAIN Board ................................................................... 5
2-4. BATTERY Board ............................................................ 5
2-5. Putting the Sheet (A)....................................................... 6
3. ELECTRICAL ADJUSTMENTS......................... 7
4. DIAGRAMS
4-1. Block Diagram – TUNER Section – ............................. 9
4-2. Block Diagram – MAIN Section – ................................ 10
4-3. Note for Printed Wiring Boards
and Schematic Diagrams ................................................ 11
4-4. Printed Wiring Board
– MAIN Board (Component Side) – .............................. 12
4-5. Printed Wiring Board
– MAIN Board (Conductor Side) – ................................ 13
4-6. Printed Wiring Board – BATTERY Board – ................. 14
4-7. Schematic Diagram – BATTERY/MAIN Boards – ...... 15
4-8. Printed Wiring Board
– MICROCOMPUTER Board (Component Side) –.... 16
4-9. Printed Wiring Board
– MICROCOMPUTER Board (Conductor Side) –...... 17
4-10. Schematic Diagram
– MICROCOMPUTER Board –................................... 18
4-11. IC Pin Function Description ........................................... 20
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be damaged by heat.
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.
5. EXPLODED VIEWS
5-1. Cabinet (R) Section......................................................... 21
5-2. Board Section .................................................................. 22
5-3. Cabinet (L) Section ......................................................... 23
6. ELECTRICAL PARTS LIST ............................... 24
2
Hang the hooks on
your ears.
SECTION 1
GENERAL
Hook (L, R)
SRF-HM01V
This section is extracted from
instruction manual.
POWER ON/OFF
Battery compartment lid
Neckband
Light reflector (R, L)
This reflector reflects
car lights at night for
your safety.
1
*
There is a tactile dot beside volume to show
the direction to turn up the volume.
2
*
The TUNE + button has a tactile dot.
VOL*
Neckband
1
Setting the Clock
The clock time display of this unit is a 12-hour system.
When the battery is first installed, “AM 12:00” flashes in the display.
1
Set POWER to OFF to turn off the power.
2
Hold down MEGA BASS/CLOCK for more than 2 seconds
until “AM 12” starts flashing.
3
Press TUNE + or – to adjust the hour, then press MEGA
BASS/CLOCK.
If you hold down TUNE + or –, the digit changes rapidly.
“AM 12:00 ”= midnight, “PM 12:00 ”= noon.
BAND
MODE
(Left)
L
TV/WB/FM SENS
DX/LOCAL
Driver Unit
(Right)
R
2
TUNE +*
/–
Display
MEGA BASS/CLOCK
ENTER
Changing AM Channel Step
The AM channel step differs depending on areas. The channel step of this
unit is factory-set to 10 kHz. Change the settings as shown below to be
able to listen to the radio.
Area Channel step
North and South American countries 10 kHz
Other countries 9 kHz
Note
When the AM channel step is changed, only the preset stations on the AM
band will be initialized.
1
Set POWER to OFF to turn off the power.
2
While holding down MODE, hold down TUNE + or – for
more than 5 seconds.
The channel step will change and “9” kHz (or “10” kHz) will flash for
3 seconds in the display.
If you proceed to step 2 again, the channel step changes again.
4
Repeat step 3 above to adjust the minute.
“:” starts flashing and the clock starts operating.
To set the current time exactly to the second, adjust the minute and
then press MEGA BASS/CLOCK to synchronize with a time signal
(such as the telephone time signal).
Note
If you do not press TUNE + or –, or MEGA BASS/CLOCK within one
minute, the clock setting mode will be canceled.
3
SRF-HM01V
• This set can be disassembled in the order shown below.
2-1. DISASSEMBLY FLOW
SET
SECTION 2
DISASSEMBLY
2-2. Microcomputer Board
(Page 4)
2-3. MAIN Board
(Page 5)
2-5 . Putting the Sheet (A)
(Page 6)
Note: Follow the disassembly procedure in the numerical order given.
2-2. MICROCOMPUTER BOARD
2-4. Battery Board
(Page 5)
5
rubber key switch
4
MICROCOMPUTER board
2
cabinet (front) (R) assy
3
claw
3
claw
1
four screws
(1.7
×
10)
4
2-3. MAIN BOARD
Note: When installing MAIN board,
fit lever (A) and switch (S1).
S1
3
MAIN Board
lever (A)
2
claw
2
SRF-HM01V
claw
2-4. BATTERY BOARD
1
four screws
(1.7
×
10)
1
Remove nine solders.
lever (A)
4
claw
Note: When installing BATTERY board,
fit lever (A) and switch (S401).
3
Remove eleven solders.
S401
4
claw
5
BATTERY board
2
front cabinet (L) assy
5
SRF-HM01V
2-5. PUTTING THE SHEET (A)
Put the sheet (A) positioning its corner to the corner of C26
in the main board so that the pin of CF2 is completely covered.
main board
C26
CF2
IC
6
SECTION 3
r
r
r
ELECTRICAL ADJUSTMENTS
SRF-HM01V
0 dB=1 µV
[AM]
Setting:
BAND: AM
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
[FM/TV]
Setting:
BAND: FM, TV or WEATHER
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
TP (ANT)
0.01 µF
set
set
16 Ω
headphone
16 Ω
headphone
level mete
+
–
level mete
+
–
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L4 530 kHz 1.30 ± 0.05 V
Confirmation 1710 kHz 8.10 ± 1.00 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3 590 kHz
CT3 1490 kHz
FM VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
Confirmation TV 2ch (59.75 MHz) 1.91 ± 0.50 V
Confirmation 108.0 MHz 11.70 ± 1.00 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2 TV 2ch (59.75 MHz)
CT2 108.0 MHz
TV VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
Confirmation
Confirmation
WEATHER 2ch
(162.4 MHz)
TV 13ch
(215.75 MHz)
3.00 ± 0.50 V
8.10 ± 1.00 V
digital voltmete
MAIN board
TP (VT)
TP (GND)
+
–
• Repeat the procedures in each adjustment several times for a
maximum reading on level meter.
• Remove FM wire antenna in FM adjsutments.
Adjustment Location:
– MAIN Board (Conductor Side) –
TP
(ANT)
CT1
TV Tracking
Adjustment
TP
(GND)
IC201
TP
(VT)
L4
AM VCO Voltage Adjustment
TV TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
CT1 TV 10ch (197.75 MHz)
L3
L2
FM Tracking Adjustment
CT2
AM Tracking Adjustment
CT3
7
SRF-HM01V
MEMO
8
4-1. BLOCK DIAGRAM – TUNER Section –
FM WIRE
ANTTENA
SECTION 4
DIAGRAMS
CF4
10.7MHz
11
AM BAND
SWITCHING
Q3
SRF-HM01V
SIGNAL PATH
: FM/TV (2 − 6ch)
: TV (7 − 13ch) /WEATHER
: AM
TUNER
B+
L3
AM FERRITE-ROD
ANTTENA
AM TRACKING
S1
TV/WB/FM
SENS
LOCAL
DX
CT3, L3
DX/LOCAL
SWITCHING
Q9
AM RF
BUFFER
Q5
TV/FM/WB
RF AMP
Q1
AM BAND
SWITCHING
Q6, 7
AM BAND
SWITCHING
Q2
B. P. F.
BPF1
LOW-PASS
FILTER
Q301, 302
FM TRACKING
D3
2
1
CT2, L2
FM RF IN
TV RF IN
FM RF
CF2
10.7MHz
CF3
450kHz
BUFFER
OSC OUT
23
FM MIX
AM MIX
4
5
FM/TV
MIX
OSC
L5
TV/FM
OSC
D4D5D2
TV/FM OSC
24
27
25
AM RF IN
AM OSC
AM
MIX
OSC
FM RF OUT
29
L2
CT2
TV RF OUT
30
CT1
TV
TRACKING
D1
L4
AM OSC
L4
AM VCO VOLTAGE
8
10
FM IF IN
AM IF IN
FM IF
AMP
AM IF
AMP
QUAD
FM
DET
AM
DET
FM/TV FRONT-END,
FM/AM IF AMP,
FM/AM/TV
POWER
SWITCH
MODE122MODE2
21
FM MPX
IC1
AF
AMP
DET OUT
LOUT
ROUT
16
15
MPX IN
12
13
FM
MPX
LPF1
14
MONO/ST
SWITCHING
Q4
LOUT
ROUT
A
(Page 10)
30
AM BAND
BUFFER
Q8
40
D0
38
OSC IN
SYSTEM CONTROLLER
IC301 (1/2)
52
BAND153BAND2
50
MONO/ST
99
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