Sony SRF-T615 Service Manual ▷ View online
– 5 –
TUNER SECTION
AM Section
Band : AM
Volume : MIN
Volume : MIN
FM Section
Band : FM
Volume : MIN
Volume : MIN
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T101
450kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust part
Frequency display
reading on digital
voltmeter.
L103
531kHz
Adjustment Value : 2.5V
Standard Value : 2.45 – 2.55V
Confirmation
1,710kHz
7.8 – 10.8V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L104
585kHz
CT101
1,485kHz
FM FREQUENCY COVERAGE CONFIRMATION
Adjust part
Frequency display
reading on digital
voltmeter.
Confirmation
76.0MHz
2.2 – 4.2V
Confirmation
108.0MHz
7.5 – 10.5V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L101
76.0MHz
CT102
108.0MHz
SECTION 3
ADJUSTMENTS
AM RF signal
generator
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
FM RF signal
generator
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
400Hz signal.
Output level : as low as possible
TP102 (RF IN)
MAIN board
MAIN board
0.01
µ
F
set
16
Ω
+
–
–
Headphone jack (J301)
level meter
0dB = 1
µ
V
Frequency Coverage Adjustment
Connect Location :
R541
R603
R542
R533
C120
C608
D
C603
C605
X501
D501
D104
C311
C309
C310
C301
C314
Q201
CF102
13
15
20
24
T101
Q602
B
E
E
C
C127
C204
C131
C51
R119
R309
R310
R607
R201
R
116
R120
R
5
R
5
C124
C207
C313
C308
C307
C312
C201
C504
ECB
Q504
ECB
Q503
C17
BCE
BCE
Q202
C121
L
106
Q103
C206
1
5
8
9
12
16
IC301
RV201
-1
Digital
voltmeter
voltmeter
100k
Ω
TP102
(RF IN)
(RF IN)
R533
[MAIN BOARD] (SIDE B)
– 6 –
Procedure :
1. Connect the frequency counter to 3 to 4 pins of IC201 as shown
the figure.
2. Turn the set to 98MHz.
3. Adjust RV201 for 76.0kHz reading on frequency counter.
3. Adjust RV201 for 76.0kHz reading on frequency counter.
Standard Value : 75.95 –76.05kHz
FM VCO Adjustment
FM RF signal
generator
generator
Carrier frequency : 98MHz
Modulation : no modulation
Output level : 100dB
Modulation : no modulation
Output level : 100dB
µ
V (100mV)
TP102 (RF IN)
MAIN board
MAIN board
0.01
µ
F
Adjustment Location :
T101 : AM IF Adjustment
IC101
RV201 : FM VCO Adjustment
L101 : FM Tracking Adjustment
L104 : AM Tracking Adjustment
CT102 : FM Tracking Adjustment
CT101 : AM Tracking Adjustment
L103 : AM Frequency Coverage
Adjustment
Adjustment
[MAIN BOARD] (SIDE B)
Connect Location :
CF101
1-674-988-
D101
-1 -2
-3
C125
C126
C129
R114
R111
R110
R110
R105
R109
R103
R203
R202
R108
R107
R102
R104
R20
4
R126
R124
R123
R112
C109
C113
D103 C104
C110
C132
C111
C111
C107
C103
C105
C102
C130
C209
C208
C208
C205
C133
C302
BCE
ECB
Q104
1
5
6
10
IC201
D102
ECB
Q102
117
frequency counter
IC201
4
IC201
3
1
µ
F
33k
Ω
[MAIN BOARD] (SIDE A)
– 7 –
Pin No.
Pin name
I/O
Description
1
DO
—
Not used (OPEN).
2
EEPROM CS
—
Not used (OPEN).
3
TV 4-12CH
—
Not used (OPEN).
4
MUTE
O
Audio mute signal output.
5
NC
—
Not used (Connect to ground).
6
POWER
O
Power ON/OFF control output.
7
KS0
O
Key source signal output. *1
8
KS1
O
Key source signal output. *1
9
KS2
O
Key source signal output. *1
10
KS3
O
Key source signal output. *1
11
KR0
I
Key return signal input.
12
NC
—
Not used (Connect to ground).
13
KR1
I
Key return signal input. *1
14
KR2
I
Key return signal input. *1
15
KR3
I
Key return signal input. *1
16
METER
O
Meter drive signal output (Not used : OPEN).
17
ST/MONO
O
Stereo/ Mono control signal output.
18
V DET2
I
Voltage decrease detection input. “L” : less than 2.1V (Change to clock mode).
19
BAND
O
Band select output. “H” : AM, “L” : FM
20
GND
—
Ground terminal.
21
GND
—
Ground terminal.
22
EO
O
PLL error signal output for PLL LPF.
23
VCOL
I
VCO input.
24
VCOH
—
Not used (OPEN).
25
REG0
—
Capacitor connection terminal for LCD drive voltage.
26
VDD
—
Power supply terminal (3V).
27
VDD
—
Power supply terminal (3V).
28
X OUT
O
System clock output (75kHz).
29
X IN
I
System clock input (75kHz).
30
REG1
—
Capacitor connection terminal for LCD drive voltage.
31
LEG LCD0
—
Capacitor connection terminal for LCD drive voltage.
32
CAP LCD0
—
Capacitor connection terminal for LCD drive voltage.
33
CAP2 LCD1
—
Capacitor connection terminal for LCD drive voltage.
34
LEG LCD1
—
Capacitor connection terminal for LCD drive voltage.
35
COM0
O
Common signal output for LCD.
36
COM1
O
Common signal output for LCD.
37
COM2
O
Common signal output for LCD.
38
NC
—
Not used (Connect to ground).
39
COM3
O
Common signal output for LCD.
40
LCD0
O
Segment signal output for LCD.
41
LCD1
O
Segment signal output for LCD.
42
LCD2
O
Segment signal output for LCD.
43
LCD3
O
Segment signal output for LCD.
44
LCD4
O
Segment signal output for LCD.
45
NC
—
Not used (Connect to ground).
SECTION 4
DIAGRAMS
4-1. EXPLANATION OF IC TERMINALS
IC502
µ
PD17073GB-925-9EU (SYSTEM CONTROL, LCD DRIVE)
– 8 –
Pin No.
Pin name
I/O
Description
46
LCD5
O
Segment signal output for LCD.
47
LCD6
O
Segment signal output for LCD.
48
LCD7
O
Segment signal output for LCD.
49
LCD8
O
Segment signal output for LCD.
50
LCD9
O
Segment signal output for LCD.
51
LCD10
O
Segment signal output for LCD.
52
LCD11
O
Segment signal output for LCD.
53
LCD12
O
Segment signal output for LCD.
54
NC
—
Not used (Connected to ground).
55
LCD13
O
Segment signal output for LCD.
56
LCD14
O
Segment signal output for LCD.
57
CE
I
Voltage decrease detection input. “L” : less than 1.9V (Change to clock mode).
58
INT
I
Hold switch input terminal. “L” : Hold
59
NC
—
Not used (Connect to ground).
60
BEEP
O
Beep signal output.
61
NOISE CUT
O
Noise filter circuit control signal output.
62
—
Not used (OPEN)
63
—
Not used (Fixed at “L”)
64
DI
—
Not used.
*1 Key matrix
KS0 (7 pin)
KS1 (8 pin)
KS2 (9 pin)
KS3 (q; pin)
KR0 (qa pin)
Preset station <1>
POWER
ENT/BAND
Preset station <5>
S502
S503
S504 (JOG)
S505
KR1 (qd pin)
Preset station <4>
NOISE CUT
TUNE <->
S506
S507
S504 (JOG)
KR2 (qf pin)
Preset station <2>
Preset station <6>
S508
S509
KR3 (qg pin)
Preset station <3>
MENU
TUNE <+>
Preset station <7>
S510
S511
S504 (JOG)
S512
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