Sony ICF-M1000, Service Manual

Page: 7 / 44

7
ICF-M1000
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
T1 450 kHz
( ): AEP, UK models
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L2 530 (531) kHz 2.9 (2.975)
±
0.1 (0.025) V
Confirmation 1,710 (1,602) kHz 11.0 (9.5)
±
1.5 V
( ): AEP, UK models
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1 580 (621) kHz
CT1 1,490 (1,404) kHz
( ): AEP, UK models
FM FREQUENCY COVERAGE CONFIRMATION
Adjustment Part Frequency Display Reading on Digital Voltmeter
87.5 MHz 2.9 (2.85)
±
0.5 (0.15) V
Confirmation
108 MHz 9.0 (10.0)
±
2.0 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L4 87.5 MHz
CT2 108 MHz
Adjustment Location: MAIN board (See page 8)
FM VCO ADJUSTMENT
Setting:
Procedure:
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.
Specified Value: 75.7 to 76.3 kHz
Adjustment Location: MAIN board (See page 8)
SECTION 4
ELECTRICAL ADJUSTMENTS
0 dB=1
µ
V
[AM]
Setting:
Function : RADIO
Band
: AM
[FM]
Setting:
Function : RADIO
Band
: FM
• Repeat the procedures in each adjustment several times, and
tracking adjustments should be finally done by the trimmer
capacitors.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
+
–
level meter
set
4
Ω
MAIN board
headphone jack (J303)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
–
level meter
set
4
Ω
0.01
µ
F
MAIN board
TP18 (FM ANTIN)
MAIN board
headphone jack (J303)
MAIN board
TP2 (RF GND)
digital voltmeter
100 k
Ω
MAIN board
TP1 (VT)
FM RF SSG
Carrier frequency: 87.5 MHz
Modulation: 400 Hz, 30% FM modulation
Output level: 0.1 V (100 dB)
MAIN board
TP18 (FM ANTIN)
0.01
µ
F
set
MAIN board
TP2 (RF GND)
1
µ
F
TP9 (MPX)
+
–
frequency counter
33 k
Ω
TP8 (RADIO +B)
+
MAIN board
Ver. 1.3