Sony ICF-M770L, Руководство по обслуживанию

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6
ICF-M770L/M770S/M770SL
no mark : common
( ) : ICF-M770L
[ ] : ICF-M770S
〈〈 〉〉 : ICF-M770SL
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1 450 kHz
MW VT VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
(L8) [L10] 531 kHz 2.5 ± 0.1 V [2.8 ± 0.1 V]
Confirmation 1,602 kHz 9.6 ± 1.0 V
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
(L5-1) [L5] 603 kHz
(CT1) [CT2] 1,404 kHz
LW VT VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
(CT3)
〈〈
L10
〉〉
153 kHz 2.2
±
0.1 V
〈〈
2.8
±
0.1 V
〉〉
Confirmation 279 kHz 8.6 ± 1.0 V
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
(L5-2) 〈〈 L5 〉〉 162 kHz
CT2 243 kHz
FM VT VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L14 87.5 MHz 2.9 ± 1.0 V
Confirmation 108 MHz 9.1 ± 1.0 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L12, 13 87.5 MHz
CT4 108 MHz
SW VT VOLTAGE ADJUSTMENT
*
Adjustment Part Frequency Display Reading on Digital Voltmeter
L8 5,800 kHz 2.7 ± 0.1 V
Confirmation 15,900 kHz 9.1 ± 1.0 V
SW TRACKING ADJUSTMENT
*
Adjust for a maximum reading on level meter
L3 5,800 kHz
CT1 15,900 kHz
*: ICF-M770S/M770SL
Adjustment Location: MAIN board (See page 7)
0 dB=1 µ V
[MW/LW]
Setting:
BAND switch: MW or LW
[FM]
Setting:
BAND switch: FM
[SW] (ICF-M770S/M770SL)
Setting:
BAND switch: SW
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
• Remove FM/SW antenna in FM/SW adjustment.
digital voltmeter
100 k Ω
MAIN board
TP (VT)
+
–
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
+
–
level meter
set
32 Ω
11 pF
MAIN board
TP (ANT)
JACK board
v jack (J201)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
+
–
level meter
set
32
Ω
0.01 µ F
MAIN board
TP (ANT)
JACK board
v jack (J201)
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
32 Ω
JACK board
v jack (J201)
SECTION 4
ELECTRICAL ADJUSTMENTS