Sony SRF-87 (serv.man2) Service Manual ▷ View online
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for maximum reading on level meter.
L4
520 kHz (Except Italian)
516 kHz (Italian)
1750 kHz (Canadian)
CT2
1650 kHz (AEP, UK, E, Australian)
1631.5 kHz (Italian)
SECTION 4
ELECTRICAL ADJUSTMENT
AM Section
Setting:
BAND switch: AM
FM Section
Setting:
BAND switch: FM
AM TRACKING ADJUSTMENT
Adjust for maximum reading on level meter.
L6
600 kHz
CT3
1400 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for maximum reading on level meter.
L7
86.5 MHz (Except Italian)
87.35 MHz (Italian)
CT4
109.5 MHz (Except Italian)
108.25 MHz (Italian)
FM TRACKING ADJUSTMENT
Adjust for maximum reading on level meter.
L2
86.5 MHz (Except Italian)
87.35 MHz (Italian)
CT1
109.5 MHz (Except Italian)
108.25 MHz (Italian)
• Repeat the procedures in each adjustment several times, and
the frequency coverage and tracking adjustments should be fi-
nally done by the timmer capacitors.
nally done by the timmer capacitors.
+
–
–
– 5 –
TP (FM ANT IN)
set
headphone jack (
2
)
16
Ω
level meter
0.01 µF
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
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
30% amplitude modulation
by 400 Hz signal
Output level: as low as possible
by 400 Hz signal
Output level: as low as possible
AM RF signal
generator
generator
– 6 –
Adjustment Location:
[MAIN BOARD] (COMPONENT SIDE)
[MAIN BOARD] (CONDUCTOR SIDE)
2nd OSC Adjustment
Setting:
BAND switch: FM DX
Procedure:
1. Connect the frequency counter to TP (OSC).
2. Adjust L3 for 57.1 MHz ± 0.25 MHz reading on the frequency
1. Connect the frequency counter to TP (OSC).
2. Adjust L3 for 57.1 MHz ± 0.25 MHz reading on the frequency
counter.
Connection:
FM STEREO (38KHz) Adjustment
Setting:
BAND switch: FM DX
Procedure:
1. Connect the frequency counter to TP (VCO).
2. Adjust L5 for 38 kHz ± 0.05 kHz reading on frequency counter.
1. Connect the frequency counter to TP (VCO).
2. Adjust L5 for 38 kHz ± 0.05 kHz reading on frequency counter.
Connection:
+
+
–
TP (OSC) (IC1
@¢
PIN)
1 µF/50 V
frequency counter
TP (VCO) (IC1
!ª
PIN)
1 µF/50 V
frequency counter
+
+
–
L5 FM STEREO (38 kHz)
ADJUSTMENT
L7 FM FREQUENCY
COVERAGE ADJUSTMENT
L6
AM TRACKING
ADJUSTMENT
L2
FM TRACKING
ADJUSTMENT
RV1
CV1
S2
S1
IC1
CV1
CT3
AM TRACKING
ADJUSTMENT
CT1
FM TRACKING
ADJUSTMENT
TP
(FM NAT IN)
TP (OSC)
TP (VCO)
CT2
AM FREQUENCY
COVERAGE
ADJUSTMENT
CT4
FM FREQUENCY
COVERAGE
ADJUSTMENT
L4 AM FREQUENCY
COVERAGE ADJUSTMENT
L3 2nd OSC ADJUSTMENT
– 11 –
• IC Block Diagrams
IC1
CXA1129N-T4
1
2
6
8
FM/TV
RF AMP
FM/TV
MIX
FM/TV
1ST LOCAL
OSC
AFC
AM
RF AMP
OVER LOAD
AGC
MIX
1
MIX
2
PSN
1
PSN
2
AGC
AF AMP
LPF
DETUNE
DET
FM
LPF
AM
BPF
LOCAL
OSC
1/2
COUNTER
FM/TV
SELECT
FM
DISCRI
FM
LIMITTER
AMP
AM IF AMP
(FM TUN IND)
AM
DET
AGC
TUNING
IND
VCO
MUTE
SEP
CONTROL
ST.
DECORDER
INPUT
BUFF
VCO
LEVEL
CONTROL
BUFF
AMP
DC
AMP
PD
SYNC
DET
R CH
AMP
L CH
AMP
AMP
LOAD
SELECT
1/2
COUNTER
FM/AM
SELECT
M/ST.SW
ST.IND
FM/TV
30 29
25
24 23
26
28
27
22
20
3 4 5
7
9
10
11
12
13 14
15
16
17
18
19
21
FM/AM
FM/TV
38KHz
0
π
/2
FM/TV
FM/AM
19KHz
π
/2
19KHz
0
38KHz
FM IN
TV IN
NC
FM RF
GAIN ADJ
OL AGC
2ND OSC
AM OSC
TUN IND
PLL1
PLL2
VCO OSC
VCO CONT
R OUT
L OUT
ST IND
PD2
PD1
MPX IN
DET OUT
MUTE
AGC2
NC
FM IF
NC
TV OSC
FM OSC
AGC1
AM IN
NC
ON/OFF
1
2
3
4
5
6
7
8
9
10
14
13
12
11
OUT-1
OUT-2
DET IN
DET OUT
REF
VCC
GND
LP-OUT
LP-GAIN
LP-IN
HP-2
HP-1
IN-2
IN-1
IC2
LA3550MTP-1
IC3
LA4537M
POWER
SWITCH
MUTE
BIAS
AMP
AMP
1
2
3
4
5
6
7
8
9
10 MUTE
R-OUT
GND
L-OUT
VCC
PWR
R-IN
GND
L-IN
REG
– 12 –
NOTE:
•
-XX and -X mean standardized parts, so they
may have some difference from the original
one.
may have some difference from the original
one.
•
Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑
↑
Parts Color
Cabinet's Color
•
Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
•
The mechanical parts with no reference num-
ber in the exploded views are not supplied.
ber in the exploded views are not supplied.
•
Accessories and packing materials are given
in the last of the electrical parts list.
in the last of the electrical parts list.
SECTION 6
EXPLODED VIEW
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
1
3-318-203-21 SCREW (B 1.7X8), TAPPING
2
X-3373-805-1 CABINET (FRONT) ASSY (Canadian)
2
X-3373-806-1 CABINET (FRONT) ASSY (EXCEPT Canadian)
3
3-011-223-01 POINTER
4
3-011-216-01 PLATE, BACK
5
3-011-226-01 TERMINAL (–), BATTERY
6
3-318-203-71 SCREW (B 1.7X5), TAPPING
7
3-011-225-01 TERMINAL (+), BATTERY
* 8
A-3679-856-A MAIN BOARD, COMPLETE (Canadian)
* 8
A-3679-857-A MAIN BOARD, COMPLETE
(AEP, UK, E, Australian)
* 8
A-3679-858-A MAIN BOARD, COMPLETE (Italian)
9
3-011-220-01 GEAR (VC)
10
3-880-990-00 SCREW (1.7X3), FLAT, (+) SPECIAL
11
3-379-174-11 SCREW
12
3-011-222-01 LEVER
13
3-011-211-01 LID, BATTERY CASE
14
3-011-210-01 CABINET (REAR) (Canadian)
14
3-011-210-11 CABINET (REAR) (EXCEPT Canadian)
15
3-011-655-01 PLATE, BLIND
16
3-011-221-01 GEAR, MIDWAY
17
3-011-228-01 WASHER
18
3-378-965-01 SPRING, RING
19
3-898-411-01 PACKING, KNOB
20
3-011-219-01 KNOB (VOLUME)
21
3-011-218-01 KNOB (TUNING)
22
3-011-217-11 KNOB (POWER) (BAND)
23
3-011-217-01 KNOB (POWER)
24
3-011-213-01 PANEL
25
3-014-981-01 SPACER
J1
1-782-206-11 CORD, CONNECTION
1
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
J1
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