Sony Walkman SRF-S84, Service Manual

Page: 5 / 14

SRF-S84
5 5
Procedure :
1. Connect the frequency counter to TP9 as shown the figure.
2. Turn the set to 98MHz.
3. Adjust L4 for 38kHz reading on frequency counter.
Standard Value : 37.95 –38.05kHz
FM VCO Adjustment
FM RF signal
generator
Carrier frequency : 98MHz
Modulation : no modulation
Output level : 100dB
µ
V(100mV)
TP6 (RF IN)
MAIN board
0.01
µ
F
TUNER SECTION
AM Section
Band : AM
Volume : MAX
FM Section
Band : FM
Volume : MAX
SECTION 4
ADJUSTMENTS
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
FM RF signal
generator
22.5: kHz frequency deviation by
400Hz signal
Output level : as low as possible
TP6 (RF IN)
MAIN board
0.06
µ
F
set
16
Ω
+
–
Headphone jack (J1)
level meter
0dB = 1
µ
V
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT4
520kHz
1,650kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
CT3
520kHz
1,650kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
CT1
86.5MHz
109.5MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT2
86.5MHz
109.5MHz
Connect Location :
[MAIN BOARD] (SIDE B)
Adjustment Location :
CT1 : FM Frequency Coverage Adjustment
CT4 : AM Frequency Coverage Adjustment
L3 : AM Frequency Coverage Adjustment
L6: FM Frequency Coverage Adjustment
L2: FM 2ND OSC Adjustment
L5 : AM Tracking Adjustment
CT3: AM Tracking Adjustment
L1 : FM Tracking Adjustment
L4 : FM VCO Adjustment
CT2 : FM Tracking Adjustment
MAIN BOARD (SIDE B) MAIN BOARD (SIDE A)
Procedure :
1. Connect the frequency counter to TP10 as shown the figure.
2. Turn the set to 98MHz.
3. Adjust L2 for 57.1MHz reading on frequency counter.
Standard Value : 56.85 –57.35MHz
2nd OSC Adjustment
FM RF signal
generator
Carrier frequency : 98MHz
Modulation : no modulation
Output level : 100dB
µ
V(100mV)
TP6 (RF IN)
MAIN board
0.01
µ
F
C12
C10
C23
R4
C7
C4
L2
L4
R3
C8
C11
R11
C18
L6
C21
1
16
20
25
30
15
IC1
Q1
C3
L3
C20
C19
S1
-2 -1
L5
AM
FERRITE-ROD
ANTENNA
C22
C9
TP8
TP9
TP10
11
(11) 1-682-982-
TP9
TP8
10
µ
F
Frequency
counter
1
µ
F
Connect Location :
[MAIN BOARD] (SIDE B)
C12
C10
C23
R4
C7
C4
L2
L4
R3
C8
C11
R11
C18
L6
C21
1
16
20
25
30
15
IC1
Q1
C3
L3
C20
C19
S1
-2 -1
L5
AM
FERRITE-ROD
ANTENNA
C22
C9
TP8
TP9
TP10
11
(11) 1-682-982-
TP10
10
µ
F
Frequency
counter
1
µ
F
TP8