Electrical Adjustments - Sony ICF-M1000 Service Manual

0 dB=1 µV
[AM]
Setting:
Function : RADIO
Band : AM
Put the lead-wire
AM RF signal
antenna close to
generator
the set.
set
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
[FM]
Setting:
Function : RADIO
Band : FM
FM RF signal
MAIN board
generator
TP18 (FM ANTIN)
0.01 µ F
set
22.5 kHz frequency
MAIN board
deviation by 400 Hz
TP2 (RF GND)
signal
Output level: as low as possible
digital voltmeter
100 k Ω
MAIN board
TP1 (VT)
• Repeat the procedures in each adjustment several times, and
tracking adjustments should be finally done by the trimmer
capacitors.
SECTION 4

ELECTRICAL ADJUSTMENTS

level meter
4 Ω
+
–
MAIN board
headphone jack (J303)
level meter
4 Ω
+
–
MAIN board
headphone jack (J303)
Adjustment Location: MAIN board (See page 8)
FM VCO ADJUSTMENT
Setting:
Procedure:
Specified Value: 75.7 to 76.3 kHz
Adjustment Location: MAIN board (See page 8)
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
T1
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display
L2 530 (531) kHz
Confirmation 1,710 (1,602) kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
CT1
FM FREQUENCY COVERAGE CONFIRMATION
Adjustment Part Frequency Display
87.5 MHz
Confirmation
108 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L4
CT2
FM RF SSG
0.01 µ F
Carrier frequency: 87.5 MHz
Modulation: 400 Hz, 30% FM modulation
Output level: 0.1 V (100 dB)
1. Connect the frequency counter to TP9 (MPX), TP8 (RADIO
+B) on the MAIN board, as shown the figure below.
2. Tune the set to 87.5 MHz.
3. Adjust RV1 on the MAIN board for 76 kHz reading on the
frequency counter.
MAIN board
1 µ F
TP9 (MPX)
+
33 k Ω
TP8 (RADIO +B)
ICF-M1000
Ver. 1.3
450 kHz
( ): AEP, UK models
Reading on Digital Voltmeter
2.9 (2.975) ± 0.1 (0.025) V
11.0 (9.5) ± 1.5 V
( ): AEP, UK models
580 (621) kHz
1,490 (1,404) kHz
( ): AEP, UK models
Reading on Digital Voltmeter
2.9 (2.85) ± 0.5 (0.15) V
9.0 (10.0) ± 2.0 V
87.5 MHz
108 MHz
MAIN board
TP18 (FM ANTIN)
set
MAIN board
TP2 (RF GND)
frequency counter
+
–
7