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ELECTRICAL ADJUSTMENT
0dB=1µV
FM RF signal
generator
0.01 F
to ANT (TP6)
75kHz (100%) amplitude modulation
by 1kHz signal.
Output level : as low as possible
Level meter
16
+
Set
–
Headphones jack (J1)
• Repeat the procedures in each adjustment several times.
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
86.5MHz
CT1
109.5MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
86.5MHz
CT2
109.5MHz
FM 2nd OSC Adjustment
Procedure :
FM RF signal
generator
0.01 F
to ANT (TP6)
Carrier frequency : 98MHz
Modulation : no modulation
Output level : 0.1V (100dB)
1. Connect frequency counter to the positions shown below.
2. Tune the set to 98 MHz.
3. Adjust L2 so that the value of the frequency counter reading
becomes 57.1 MHz.
Frequency counter
1 F
TP8
+
TP10
–
100k
10 F
TP (GND)
Specification Value :
Frequency counter
56.85 – 57.35 MHz
SECTION 3
FM VCO Adjustment
Procedure :
FM RF signal
generator
0.01 F
Carrier frequency : 98MHz
Modulation : no modulation
Output level : 0.1V (100dB)
1. Connect frequency counter to the positions shown below.
2. Tune the set to 98 MHz.
3. Adjust L4 so that the value of the frequency counter reading
becomes 38 kHz.
Frequency counter
1 F
TP8
TP9
100k
10 F
TP (GND)
Specification Value :
Frequency counter
37.95 – 38.05 kHz
Adjustment Location: MAIN board (Side B)
L1
FM tracking
adjustment
10
6
CT1
FM tracking
IC3
adjustment
1
5
TP6
TP10
CV1
TP (GND)
30
16
IC1
1
15
TP8
CT2
FM frequency
coverage adjustment
L6
FM frequency coverage adjustment
— 5 —
Note on Printed Wiring Board:
• X : parts extracted from the conductor side.
•
: parts extracted from the component side.
•
: Through hole.
a
• b : Pattern from the side which enables seeing.
Caution:
Pattern face side:
Parts on the pattern face side seen from
(SIDE A)
the pattern face are indicated.
to ANT (TP6)
Parts face side:
Parts on the parts face side seen from
(SIDE B)
the parts face are indicated.
+
–
• IC BLOCK DIAGRAMS
IC3
LA4535M
POWER
1
PWR
SWITCH
2
R-IN
AMP
GND
3
BIAS
L-IN
4
AMP
REG
5
IC1
CXA1129N
30 29
28
27
26
L2 (Side A)
FM 2nd OSC
adjustment
FM/TV
FM/TV
RF AMP
FM/TV
MIX
TP9
TP
(GND)
FM/TV
FM/TV
1ST LOCAL
OSC
AGC
L4
FM VCO
AM
RF AMP
adjustment
1
2
3 4 5
SECTION 4
DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in
specified.
• C : panel designation.
• U : 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
• Voltages are taken with a VOM (Input impedance 10 M ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Signal path.
F
10 MUTE
MUTE
9
R-OUT
8
GND
7
L-OUT
6
VCC
25
24 23
22
21
20
19
FM/TV
38KHz
FM/AM
OVER LOAD
LOCAL
FM/TV
VCO
AGC
OSC
SELECT
0
1/2
FM
/2
COUNTER
DISCRI
SEP
FM
CONTROL
MIX
PSN
FM
LIMITTER
1
LPF
1
AMP
MUTE
PSN
AM
AM IF AMP
MIX
ST.
2
BPF
(FM TUN IND)
2
DECORDER
AM
INPUT
DET
BUFF
AFC
AGC
AF AMP
DETUNE
TUNING
IND
LPF
DET
6
7
8
9
10
11
12
— 6 —
SRF-QT1
and
1
/
W or less unless otherwise
4
: FM
18
17
16
VCO
R CH
L CH
LEVEL
AMP
AMP
CONTROL
BUFF
LOAD
AMP
SELECT
38KHz
DC
1/2
AMP
COUNTER
19KHz
/2
PD
19KHz
0
SYNC
DET
FM/AM
FM/AM
SELECT
M/ST.SW
ST.IND
13 14
15
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