Sony SRF-HM03V Service Manual ▷ View online
SRF-HM03V
5
2-4.
MICON BOARD, MAIN BOARD
1
six screws
(1.7)
(1.7)
3
two screws
(1.7)
(1.7)
5
claw
q;
two claws
qa
two claws
4
two screws
(B1.4)
(B1.4)
6
cabinet assy front (R)
8
MICON board
qs
MAIN board
2
9
Remove the ten solders.
MAIN board
gray
white
blue
blue
yerrow
red
black
black
S1
Note: When installing the MAIN board, fit the knob and switch (S1).
7
connector
(CN301)
(CN301)
green
natural
2-3.
CABLE SETTING
Note:
When installing the POWER board, set the cables as shown figure.
POWER board
slit
slit
slit
slit
slit
SRF-HM03V
6
2-5.
PUTTING THE SHEET (A)
MICON board
sheet (A)
leaf (UCOM), copper
7
SRF-HM03V
SECTION 3
ELECTRICAL ADJUSTMENTS
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/TV (2-6CH) VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
TV 2ch (59.75 MHz)
1.95
±
0.50 V
Confirmation
108.0 MHz
11.80
±
1.00 V
FM/TV (2-6CH) TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
TV 2ch (59.75 MHz)
CT2
108.0 MHz
TV (7-13CH)/WEATHER VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
WEATHER 2ch
3.10
±
0.50 V
(162.4 MHz)
Confirmation
TV 13ch
8.10
±
1.00 V
(215.75 MHz)
TV (7-13CH)/WEATHER TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
CT1
TV 10ch (197.75 MHz)
0 dB=1
µ
V
[AM]
Setting:
BAND: AM
BAND: AM
[FM/TV/WEATHER]
Setting:
BAND: FM/TV/WEATHER
BAND: FM/TV/WEATHER
• Repeat the procedures in each adjustment several times for a
maximum reading on level meter, and each tracking adjustments
should be finally done by the trimmer capacitors.
should be finally done by the trimmer capacitors.
• Remove FM/TV/WEATHER lead-wire antenna in FM/TV/
WEATHER adjsutments.
Adjustment Location:
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
16
Ω
headphone
FM RF signal
generator
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
headphone
set
16
Ω
0.01
µ
F
TP (ANT)
+
–
–
digital voltmeter
MAIN board
TP (VT)
TP (GND)
– MAIN BOARD (Conductor Side) –
TP
(ANT)
TP
(GND)
TP
(VT)
IC101
CT1
TV (7-13CH)/WEATHER
Tracking Adjustment
TV (7-13CH)/WEATHER
Tracking Adjustment
L4
AM VCO Voltage Adjustment
AM VCO Voltage Adjustment
L3
CT3
CT3
AM Tracking Adjustment
L2
CT2
CT2
FM/TV (2-6CH) Tracking Adjustment
8
SRF-HM03V
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
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.
•
C
: panel designation.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 1.5 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 : FM/TV (2-6 ch)
(
no mark : FM/TV (2-6 ch)
(
) : TV (7-13 ch)/WEATHER
[
] : AM
∗
: Impossible to measure
• 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.
F
: FM/TV (2-6 ch)
L
: TV (7-13 ch)/WEATHER
f
: AM
Note on Printed Wiring Boards:
•
•
X
: parts extracted from the component side.
•
Y
: parts extracted from the conductor side.
•
z
: Through hole.
•
: Pattern from the side which enables seeing.
•
: Carbon pattern.
(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.
SECTION 4
DIAGRAMS
4-1.
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAM
Click on the first or last page to see other SRF-HM03V service manuals if exist.