Fm Steero Vco Adjustment; Carrier Frequency - Sony CFD-K10 Service Manual

CFD.KlO
TU
. AM Section
AM rt signal
geneftrtor
Afl FREQUENCY COYERAGE
ADJUSlTENT
adiustment
reading on
disital
voltmeter
frequency
indicator
L4
2 . 1 i 0 . I V
53lk Hz
confirm
ur'ithin 8.0 to 9.0V
1,611kH 2
l-f ,
Put the lead'wrre
l ,c\ |ry îi:":i'*""
| / ) ' , z r \ \ I l l
" ' -
| ! - J I t r
r
I t l
| \./ è-_t_)t
- 9 - r - _
30% amplitude
rnodulation by
400H2 signal
oulput level: as low as possible
. FM Section
FM rl signal
generator
FM antenna
InpuI
deviation by 400H2 signal
output level: as low as æssible
WvM
(range: 0.5- svac)
r Repeat the procedures in each adjustment several times,
and the frequency coverage and tracking adjustments
should be finally done by the trimmer capacitors.
FÙI FREQUENCY COVERAGE
ADJ U ST I'ETIT
adjustment
reading on
disital
voltmeter
ftequency
indicator
L2
3.7+0.1V 87.5MHz
c'r2
9.0t0.1v I0 8 M Hz
FT TRACKIT'G AOJUSTfgI{T
Adjust lor a maximurn reading on VTVM.
L 1
crl
87.5MHz
108MHz
Adiust Ior a maximum reading on VTVM.
L3
cT3
621kHz
l , 4 0 4 k H z
FM Stereo VCO Adjustment
Procedure :
. B A N D s w i t c h . . . . F M
FM rf signal
generalor
0 . 0 0 1 r F
l C 1 p i n @
( F M I F I N P U T )
Output level: 70dB
Carrier frequency: The frequency indicated by the color on
the caramic filter (CFL' 2' 3)
Color
Carrier
Frequency
white
I0.7SMHz
Output level : 70dB
Adjust RVl so that the frequency counter reads 76OkHz+
0.1kHz.
Adjustment Location: tuner board (See page 36.)
I
-
F-t
r+
I
Carrier frequency: 87.sMHz
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