Pioneer A-550R-S Service Manual - Page 8
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I¢101
UPC4570C (A-SSOR}
M5220P( A~450A)
Q203-208. 215-218.
2SA1048
Q305
Q231. 232
2Sat145
Q223. 224
2541306
Q229. 230. 233. 234.
2S5a992
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291-294
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301. 302
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2SC2603
219.
220
2SC2705
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2SK369.
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assembly
MITCHEO
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APOWER TRANSFORMER
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assembly
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INPUT SELECTOR
$901
assembly
CONTROL
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11
12
1. RESISTORS:
Indicated
in $2, AW, YeW. t5% tolerance unless otherwise noted k : k3t,
M > M&, (F) 2 21%, (G): 2%, (K) : 210%
(M); 20%
tolerance
2. CAPACITORS:
Indicated
in capacity
(uF)/voltage (V) unless otherwise noted p : pF
Indication
without voltage
is 50V
except
electrolytic
capacitor.
3. VOLTAGE,
CURRENT:
(} : Signal voltage at (
we
w
}
: OC voltage (V) at no input signal
Value in (
) is DC voltage at rated power.
<> mA: OC current at no input signal
BX2)output (1kHz)
4. OTHERS:
aap : 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,
be sure to use parts of identical designation.
#&
marked capacitors and resistors have Parts numbers,
This is the basic schematic diagram,
but the actual circuit may vary
due to improvements in design
SWITCHES
POWER SW assembly
S501
POWER
ROTARY
FUNC.
assembly
S901
ROTARY SW
LED assembly
S902
STANDBY
AF COMPLEX
assembly
S101
PHONO SEL MM/MC
(A-550R ONLY)
S701
FUNCTION
REC SEL
$702
FUNCTION
S703
DIRECT SW ON/OFF:
TONE assembly
$601
SUB SONIC ON/OFF
(A-550R ONLY)
$602
LOUDNESS
S604
MUT.K
IIEADPHONE assembly
S801-1
SP-A ON/OFF
S$801-2
SP-B ON/OFF
LINE VOLTAGE SELECTION
Line voltage can be changed with the following steps.
1. Disconnect the AC Power cord.
2. Remove the top cover.
3. Change the connection of the power transformer primary
pins.
Voltage
Power transformer Pin No.
220V
3
240V
5
4. Stick the line voltage label on the rear panel.
Part No.
Description
AAX—193
220V label
AAX-— 192
240V label
12
D