Sony ICF-990L - Section 3 Electrical Adjustment; Frequency Coverage Adjustments; Tracking Adjustments; IF Adjustments

MW/4LW/SW
BAND switch : MW/LW/SW
AM RF signal
generator (MW, LW)
30% amplitude
modulation
by 400Hz signal
output level:as low as possible.
AM RF signal
generator (SW)
30% amplitude
modulation
by 400Hz signal
output level:as low as possible.
[MAIN BOARD]
(CONDUCTOR SIDE)
SECTION 3
ELECTRICAL ADJUSTMENT
Put the lead wire
antenna close
to the set.
SW antenna
input land
ee
SW RF signal
generator
BAND switch : FM
FM RF signal
generator
input terminal
Ca» 0.01 uF Eon
£22, 5kHz frequency deviation
by 400Hz signal
output level:as low as possible. VTVW
(range:0. 5-5V ac)
telescopic antenna
322
\
@®) jack (earphone)
Note : LW adjustment should be made
after making MW adjustments. (#1)
Repeat the procedures in each adjustment
several times, and the frequency coverage
and tracking adjustments should be finally
done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on VTVM,
| 12 | A55KH2
| MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on VTVM.
L9 920kHz
| CT7 1, 650kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
L4-MW 620kHz
CT2 1, 400kHz
LQ MW Frequency Coverage
L10 SW Frequency Coverage
CT2 MW Tracking
LT FM Tracking
CT5 FM Tracking
CT7 MW Frequency Coverage
CT6 FM Frequency Coverage
SW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on VTVM.
L10 5. 850. 1MHz
CT9 18. 20. IMHz
SW TRACKING ADJUSTMENT
Adjust for a maximum reading on VIVM.
5. 85-40. 1MHz
18.20. 1MHz
t
—
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on VTVM.
CT8 145kHz
CHECK | 260kHlz & MORE
tt
*] LW TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
L4-LW 160kHz
CT3 240kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on VTVM.
Th 10. 7MHz
{Adjustment Location]
L4-MW MW Tracking CT3 LW Tracking
CT1 FM Frequency
Coverage Preset
(MAIN BOARD]
(CONDUCTOR SIDE)
i
L&8 FM Frequency Coverage
L5 SW Tracking
CT9 SW Frequency Coverage
CT4 SW Tracking
CT8 LW Frequency Coverage
L4-LW LW Tracking
Le
| ICF-880L
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on VTVM.
Germany model:87. 35-40. IMHz
Others model :87. 35MHz
C16 Germany mode! :108. 050. 4MHz
Others model: 108. OSMHz
L8
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
L7 87. 35MHz
Set PRESET Switch S101 to “ FM Ich ”.
FM FREQUENCY COVERAGE PRESET ADJUSTMENT
Adjust for a maximum reading on VTVM.
Germany model :87. 350. IMHz
Others mode!:87, 35MHz
Germany model:108. 050. 4MHz
Others model: 108. O5MHz
RV204
oO 4 —
RV204 FM Frequency Coverage Preset
{VOLUME BOARD]
(COMPONENT SIDE)
+)
[|
Tl FM IF
T2 AM IF