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6. FM/AM Tuner Alignment Procedures
VARIABLE
"output terminal
AM bar antenna
Output
Power cord
R301
ll
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£03042.23
Power transformer
use
0.2 A
£®
capacity
th
1¢301
L106
is obtained
when aligned
iam
R191
(|
Ww
®
(C108
AMCF 5103. L107
1105
2} 2]
xso1
|@
@
RI95
icios
0801
a}
lo
Connector
{C107
\P302
LP301
=]
TXX-194-1
TXX.194-3
TXX-193-1
TXX-194-2
ae
Tuning dial siumination tamp
s701.8(0)R707 5701.3
$7014
$701.2
QUIETING
mone
switeti
switeh
Recording level = MUTING
SELECTOR
| Tuning knob
Fig. 16
calibration switch switch
eae
uning
(REC CAL)
9
POWER
switch
6-(1) Frontend Section
L104 FM oscillator tuning coil:
Adjust the coil so that a 88 MHz signal can be received when the dial pointer indicates 88 MHz.
TC4 FM oscillator tuning trimmer:
When the dial pointer indicates 108 MHz, adjust the tuning trimmer so that the set receives a 108 MHz signal.
L101 FM ANT tuning coil:
L102 FM
RF1 tuning coil:
I Maximize the sensitivity at 90 MHz.
L103 FM
RF2 tuning coil:
TC1 FM ANT tuning trimmer:
TC2 FM
RF1 tuning trimmer:
i Maximize the sensitivity at 106 MHz.
TC3 FM
RF2 tuning trimmer:
T101 FM
IFT:
Maximize the sensitivity with the weak antenna input.
6-(2) FM Section
L106 FM
tracking filter:
Connect the center meter to TP 4 and 5 and adjust L106 for the center meter reading of ''0'' (zero).
R191 MPX VCO free-run frequency adjusting resistor:
Adjust the variable resistor so that the free-run frequency becomes 76 kHz at the test point.
R195 MPX pilot cancel adjusting resistor
Receiving a stereo signal, adjust the variable resistor so that leakage of the pilot signal component
(19 kHz) to the
output is minimized.
LPF301 and 302 MPX low-pass filters:
Adjustment
is not required since they are preadjusted and leakage of the subcarrier in the output signal is
minimized.
R327 stereo separation adjusting resistor:
Adjust it so that the channel separation becomes maximum.
R707 oscillator output adjusting resistor:
Adjust it so that the output level of the oscillator as the recording reference level (approx. 333 Hz) becomes
equal
to the output level of a 50-percent modulated FM signal.
R404 Signal indicator adjusting resistor:
Set an RF generator to output level 55 dB and then adjust R404 so that Signal Indicator light at proper level '5'.
6-(3) AM Section
L107 AM oscillator tuning coil:
Adjust it to receive a 600 kHz signal when the dial pointer indicates 600 kHz.
TC6 AM oscillator tuning trimmer:
Adjust it to receive a 1 400 kHz signal when the dial pointer indicates 1 400 kHz.
L1 AM bar antenna coil: Maximize the sensitivity at 600 kHz.
TC5 AM antenna tuning trimmer:
Maximize the sensitivity at 1 400 kHz.
T103 AM
IFT:
Adjustment is not required since it is preadjusted.
Maximize the IF gain.
Ta
—8 —
No. 2468
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