Onkyo TX-7430 Service Manual page 9

TX-7430
Pin No . Symbo l
Te rmi na l Dc scripii on
22 SO
Sta tion det eetor
signal input
Input termi nal for de tee ting whethcr or not a bro ndcast signal is bcing
reeeiv ed d uri ng
uu io- tu ning.
Stopped by
t
he high level.
2:\,
24 EOI, E02 Error
o u rp u rs
Charge pum p ou tp ur of thc phas e detecror with
cons i i ru res
th e PL L. High
lev el is o utpu t whc n
t
he di vidcd oscillati on frcqu c ucy is high cr rhan
ih c
refc ren cc frcqu cn cy. In th e op pos iie case , low le vel is o utput. Floa ting
occ urcs whcn thc frcq uc ucies match . T he o utpur is npp licd
10
the varia ble
ca pac itor d iod e in rhe fro nt end throu gh rhc lo w pass filler Q I04 a nd Q I05 .
T he
ou lpu t
fro m bot h tcrm iuals is sa me , but o nly E0 2 is usc tl.
25 CE C hip enab le Devi ee selcction signal inp ut termin al . High lcvcl
l. ow le vel .. . Mem ory pre sc rv.u io n
. .. No rma l op era no n
26 FM FM lo cal ose illato r
slgna l input
Input termin al [or FM loeal osc ill.uor is divided by I/l o o r
1/17 by
prc scalcr
Q7()1.
- - ­ - - ­
27 AM A M loeal osc illa ro r
signa l inp u t
Termin al for inp ut o f ih e A M local oscill.uor signa l.
2R PSC Pu lse swallow
co m ro l ou tpu t
Thi s termin al outpu ts a signal
t
luu swirchcs
t
he pre sc.iler division r.uio of
Q70 1
to 1/10 o r 1/17 whe n rhc pu lse swa llow me ih od is used [or d ivision.
(FM o nly)
29 G NO Grou nd
- - ­
-
30 SHIFT Pre set rcve rsc
indieatio n ou tp ur
Te rmina l fo r ind ienn o n ou tp ul whei her
MI - M8: Low lcvc l M9 - M 10: High
MI - MS o r M9 - MI Il the prese t key.
level
31
32
LW
MW
Ba nd switching
signa l o u rputs
Terminal s for signa l o utpul switehing of cach band . High level is o u tp ul frorn
terminal of FM (pi n
110.
33) .md low lcve l is out put lro rn o rher
t
e rm ina ls
(pin no . 3 1 & 32) d u riug r M rece prio n
33
34
35
30
37
r-M
A
B
C
0
Prese t sra rio n
indica rion OUlpUIS
Te rmi na ls for
MI M2
A
I ()
n
()
I
C
()
()
0 ()
()
..
­ -
ßCO code o utpur of pre sc t stutio n indic.uor.
M3 M4 M5 MIl M7 MS
I
() I 0 I
()
I
() 0 I I 0
()
I I I I ()
() () () () () I
3R INT Not
uscd.
39 MEMO R Y Merno ry down
inpu t
Terminal for down signal inp ut
o f p re set
Acriv e lo w.
mc m ory.
-
,.j()
4 \
42
ME MOR Y
UP
AUTOI
MANUAL
MUTE
Mem ory up
inpu t
A uto/Ma nu al
indi cation outpur
Mur ing o ut
pu l
-
T ermin al fo r up signa l inpu t of pre sc t mem o ry.
Ac iive low.
Te rmina l Ior irul ica tion output whe
t
her o r auto
i
he tuni ng mod e.
T his term inal becom es hig h d m ing
,111 10
morle a nd low (hlring munu nl
mo de ,
O utput termin al which mutes rhe shoc k noisc oeeurrin g whcn rhe PLL is
released; nctivc high . T in: muti ug signa l is outpur as show n be low .
UP/OOWN o f manu ul/au to
moc le ,
presel Illelllory is reeall ed , b.uid swirching
ancl preset
scan.