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SECTION
5
ELECTRICAL ADJUSTMENTS
TUNER SECTION
As a front-end (TB101) is difficult to repair if faulty, replace it
with new one.
Please note, however, that the following adjustments are possible :
AM Section Adjustment
AM Tuned Indication Lighting Level Adjustment
Band : MW
Setting :
loop antenna of
accessories
_.
terminal (TM101)
Procedure :
1. Set AM RF SSG output level to 76dB uw so that the input
level becomes 50dB uu .
2. Tune the set to 999kHz.
3. Adjust} AM TUN (W)} so that the TUNED light up.
Adjustment Location : Main board (TB101) (See page 10)
60cm
loop antenna
AM RF SSG
Carrier frequency : 999kHz
Modulation : 400Hz
30%
Output level : 6.3mV (76dB
)
FM Section Adjustment
FM Tuned Indication Lighting Level Adjustment
Band : FM
Setting :
FM RF SSG
FM ANTENNA terminal (TM101)
:
pose
|
Carrier frequency : 98MFIz
Modulation : kHz, 75kHz deviation
Output level; 17.8 uV (250B 1 )
Procedure :
1. Supply a 17.8uV (25dB ww) 98MHz signal to the ANTENNA
terminal.
2. Tune the set to 98MHz.
3. Adjust} FM TUN (W)| so that the TUNED light up.
Adjustment Location : Main board (TB101) (See page 10)
FM Stereo Separation Adjustment
Setting :
FM RF SSG
Carrier frequency : 98MHz
Output level:
1mV (60dB)
Modulation :
Main (1kHz) : 33.75kHz dev. (45%)
Sub (1kHz) : 33.75kHz dev. (45%)
Pilot (19kH2) : 7.5kHz dev. (10%)
FM ANTENNA
terminal (TM101)
J101 (OUTPUT)
Procedure :
Turn the set to 93MHz.
FM stereo
signal generator
output channel
VTVM
connection
VTVM
reading (dB)
®
Adjust [SEP (W)] for
minimum reading.
O
Adjust
for
minimum reading.
The separations of both channels should be equal.
Adjustment Location : Main board (TB101) (See page 10)
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