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Pioneer TX-7800 Service Manual page 3

Am/fm stereo tuner

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TX-7800
NOTE:
|
The
indicated
semiconductors
are
fopresentative
ones
only. Other alternative semiconductors may
be used and
are listed in the parts list.
o2 1S2076
oa PA3Z00I-A
o3 182076
OUTPUT LEVEL
Fixeo(L)
FMS
on HAI201
FIXED
(R)
oes
VR
Ass'y
IVARIABLE(L)
AWX - 159
Seet
a
© |
|
on | 8
LunGene
=!
LEVEL, ADy
,
C3
C60 180p
R48 620
cs
(22)
23)
@7)
20)
o5 PAIOOI-A
cas wre 4
o¢ PAIO02-A
wy
b
;
ao
RS3 33h
Ni
G9)
29 180 = (FMIZ8W) 4.42
R
A
RS
-
:
43)
ae:
R46
W.1k CF)
(1/8)
1, (EEL af
ORIV
ee
AEL- 029
BV 300mA
PLE
PLS
PLA
PLS
"OO @ @
Lasap
LU)
|
ee
eS
>—__4—4
LINE VOLTAGE
ee
al
69)
SELECTOR
018, 19, 24
°
ae
AEL- 072
240Vv
AKX- 057
2-1K26
8V 50mA
PLT?
tT
A
rao
att
©)
m
(>)
|
, |
@)
os]
O
OOUY
————
0250712
0 2SC945A
«102
OTe
os WZ-140
A
FM MUTING
ro A 2
on
Sree ase LAs
/
A
0204
23
.
Se
St; ;
POWER
1S2076
a
TOES
ASK- 127
0.04
ae
'
.
:
(0076
os
?
(10)
s
AC 220V
3
|
240V
Z
;
ey
ee, Se
Se
ee
ee
50/60Hr
SWITCH
Ass'y GWS-166
POWER
SUPPLY
Ass'y
AWR - 185
Yo
1, RESISTORS;
3. VOLTAGE, CURRENT,
on
eneS:
This is the basic schematic
diagram, but the actual
Indicated in 2, 1/4W, £5% tolerance unless otherwise
__1); OC voltage (V) at no input signal
S1 POWER
ON — OFF
iesieiasay Cees alse tg HGToEnen tS aor
noted k; k&%, M; MM, (F); t1%, (M); 20% tolerance
[mV]
; Signal voltage at FM 400Hz, 75kHz DEV.
= S2_ FUNCTION
AM — FM
fi CAPACITORS; |
mn
|
. pte i
'
+ ey NOISE HILTER
ONS ee
The A mark found on some component part indicates
i n capacity
(uF
)/voltage(V)
unless otherwise
, signal route.
-
f
f
f
There.
ee o m a
le
@_ : Adiusting point
$5 FMMUTING/MODE
OFF/MONO - ON/STERE
oy when replacing.
be sure to ut pats of retin
Indication without voltage is 50V except electrolytic
S7 TOUCH SENSOR GAIN
HIGH — LOW
dedonation.
capacitor.
The undertined
indicates the switch position.
'
.
.
-
.
z
.
z
:
;
5
.

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