Fm Section; Am Section - Onkyo TX-7430 Service Manual

FM
section
Co nnec rio n Stereo modu- Tumin g dial
It em Step FM SG ou tput Ou tpu t indicat or
Adju stment Adju s
of instrurn ent lator o utp ut setting
Fig. I 99 . I MHz
I
-
DC voltrneter Ll OI OV
99 . I MHz
FM
I kHz , 75k Hz d evi .
IF
65dBf (60 d B)
2 Fig . I
-
Ll02 Mini mun
99 .I MHz
I
Dist or tion a nalyzer
I
99 .I MHz
L+ R: 1kHz
17.2 d Bf (l2 d B)
I
Ligh t on
6 7.5 kH z devi,
Ext. modulation
Ste reo
Fig. ;
f---­
99 . IMHz
Stereo indica to r R I OI
level
99 .1MH z
Pilot sign al :
2 16 .2dBf ( 11 dB )
19k Hz
Ligh t off
Ex t. modulation 7.5k Hz devi.
99.lMHz
1kHz, 75kHz devi . Fi g.2
VCO
-
99 .1MHz Frequency counter
R2 0 1 19kHz!
65dBf (60 d B)
99.1MHz
Stereo
IF on
Fig. 3 65dBf (6 0 d B) L or Reh. 1 kHz 99 .IMHz Distortion an al yzer
Minimu rr
Distortion
front end
Ext. modulation
I 99. IMHz Lch . 1kHz
Reh . AC volt me ter Minimu rr
Stereo
f - - - ­
65dB f (6 0 d B)
Fig . 3 99 .IMHz
R20 2
Separation
2 Ext. modulation Reh . 1kHz
Lch . AC voltrne ter Minimurr
99 .l MHz
Hi-blend
35 .2dBf (30 d B) Fig.3
-
99.1MHz Hi-blend ind icator RI 0 2 Light off
level
1 kHz, 75k Hz devi ,
I
AM sectio n
Step
AM SG
ou tpu t
T uned
fre qu ency
Ou tput
indica tor
Adj ust me nt
point
Adju st for Remarks
I 5 22kHz
Digital DC
voltrne ter
OSC o n
RF blo ck
I.4V ! 0 .1 V
2
1611kHz
Digital DC
votmeter
8.0
±
1.0V
3
603kHz
400Hz 30 % mod .
60dB/m
60 3kHz
AC
vo ltmeter
RF on
RF block
Maximum
Repeat the steps 3 and 4
until no fu rt her adjustment
is necessary .
4
14 04kHz
40 0Hz 3 0% mod .
60dB/m
140 4 k Hz
AC
vo ltrn e ter
TC o n
RF block
Maximum
5
99 9 kH z
400 Hz 30 % mod.
6 0dB/ m
999k Hz
AC
vol t rnet er
XI51
I
I
Maximum
I
6 Same as above
999 k Hz
F irst signa l
indica tor
RI 5l
Light o n
Re fer ence spec if
Tun ed voltage E
1C
Au to sto p level ,
i
AM
l OO P
A;s: T
UNIT
OUTPUT
I
AC
i
I VOl D IETER
i
- 19 ­