Pioneer A-7 Service Manual - Page 22
Browse online or download pdf Service Manual for Amplifier Pioneer A-7. Pioneer A-7 32 pages.
Print Pagei
i
list.
PROTECTION Assy
are listed in the parts li
GWM-181
POWER
AMP
Ass'y
im =
eterna
=
=
ce
AWH- 104
:
L201
1, RESISTORS:
eet
eas
Oe
SNS
Se
tpn
ee
ee
(5)
as:
7)
L
rR)
RL4-4
Indicated
in
$!,
%W,
+5%
tolerance
unless otherwise
noted
k © k!?,
'5
Q201,202
2SCIB90A
Q205
2SA733A
M MQ, (FY: 1%, (G): +2%, (K). + 10%tolerance
6
,
.
:
ays Senses
@
czo1
#2034] Q203,204
2SC945A
9206
2SC1384
Q5X.8, 19022
fen
:
zw)
PROTECTION
0206
2. CAPACITORS
2SA750
er
MZ-150
Indicated in capacity (vF)/voltage (V) unless otherwise noted p . pF
Q9,10
2SC2259
R207
22k
0205
Indication without voltage 1s 50V except electrolytic capacitor
QN,12
25A733A
Q13,14
2SA905
Q15,16
2SC1915
w
VOLTAGE,
CURRENT
Signal
voltage
at
7OW®r
7OW
Bi: output
(TkHz)
Q29,30
2SC2275
Q31,32
2SA985
POWER
AMP
POWER
AMP
ar
Yai
AG
O22I2WHK) x2
CONNECTOR
aos | A ee SE
am)
PM
beef
=> . Signal route.
@ : Adjusting point
The A\ mark found on some component parts indicates the im
Portance of the safety factor of the part. Therefore, when replacing,
C4
be sure to use parts of identical designation
0201~
204
182471
D205
182473
RL4: RELAY
ASR-068
$2-3: FUNCTION (AUX)
S2-4: FUNCTION ( TAPE 1)
a
ae ae
S2-5 FUNCTION ( TAPE 2)
ON~ OFF
6
's
$3:
MUTING (-2048)
ON - OFF
033 pPO4558C
bat,
SPEAKER (A
S4-1: PHONO (MC)
ON - OFF
0C SERVO AMP
b
i
es
S4-2: PHONO (MM)
ON - OFF
VRI2: HOLE CURRENT Abs
aS
Cir aad
$4-5: LOUDNESS
ON ~ OFF
b—
44
_4
S5-{1: LINE STRAIGHT
ON — OFF
THI,2: THIO2-2
$5-2:
MODE
S$5-3:
SPEAKER
(A)
SPEAKER
]
MER
(BY
S5-4.
SPEAKER
(8)
S6:
POWER
OFF
S7:
LINE
VOLTAGE
SELECTOR
220V- 240V
The underlined indicates the switch position.
Ho
I
ASG- 280
This is the basic schematic diagram, but the actual
circuit may vary
due to improvements in design.
011 8,13 20,
025~ 28
1S1555
ON,12
STV2H
O2I~24
MZ-047
029~32
MZ-240
033,34
MZ-150
$5-3-6
POWER
SUPPLY
CIRCUIT
FOR
H8 MODEL
POWER SUPPLY Ass'y
GWR-139
7
(18)
a"
art-770A\
| |
[2a} v1os. '93
(1)
eS
1
2x | cioe
4
(©)
:
RO
39K
0.04
es
A,
|Aciso
CHEMICAL
mines
—
CAPACITOR
C103,
earns
Fw leaal] gut Law
GWR-131
hvawy
|owvew)
(5)
ac zaov
-
=
3]
/
60H
HEADPHONE
Ass'y
s
'a
:
240v
| s7: LINE
O
$6: POWER
So-eonr
ASG-535
AKX~057
220v-240v
u -———{(9¢)-
04
—_$_ 446
———
tLe
O101~
104
io! 2spa36a
ShsAM 9
REGULATOR
ONO~W NS
Fut
AC POWER CORO
i
10E2
ee
AO 081
AEK-4000
0105
182471
O™o
Dita
=MZ-130
Ase: POWER
AAA
Ea
ASG -535
(B) (272)
=
=
~
$7: LINE VOLTAGE SELECTOR
Se
AKX -057
"
-
'=
;
INDICATOR
Ass'y
GWX-571
2
-
3
=
|
LEO
METER
MODULE
AAV-301
c
OINn3)
=AEL -325
D
04X23
AEL-346
'
t
ne eked
(SUBSONIC)
{TAPEI)
(TUNER)
= (TAPEZ)
(AL)
(PHONO,
(MO0E)
(LOUDNESS)
(MM) (MC) (TAPE2)
(AUX?
(PHONO)
(TAPE 1)
(TUNER)
6
(TONED
"
(BALANCE)
(SP A) (SP BI (REC N(REC2)
'
a
Tab rEELeEtLite
el er
?
rd
4
iii rrr if
pOwvoz
Er
RO
-~-TOAXAmMooeD