Pioneer SA-506 User manual

-_|,
STEREO
AMPLIFIER
siAI5cIEi
C)rqoNEEru

siA-Eio6/s, s/e
2.4 INPUT
ASSEMBLY
(GWX-208)
,-(
Parts
List
Part
No. Symbol & Description
Pin
jack
4P
Pin
jack
6P
r raPE
_t
PLAY REC TUNIR AUX PHONO E

Eurooe or Oceania
model
22OV and24OV (Switchable)
11
OV.
12OV,
22OV
and
240V(Switchable)
110V, 12OV,22OV and
240V (Switchable) U.S.
Militarv model
MODEL
5A.506
COMES
IN THREE
VERSIONS
DISTINGUISHED
AS FOLLOWS:
SA-506/HG.
For servicing
of the other typesplease
o This
referservice
to the manual
is aPPlicable
to the
additional
service
manuals.
1.
2.
3.
4.
5.
7.5 Volume
Control
Assembly
(GWX-203)
' ' ' ' 17
7.6 AF
AmplifierAssembly
(GWK-120)
.' . . . . 18
7.7 InputAssembly
(GWX-204)
. ... 21
7.8 Headphone
Assemblv
(GWX-202) 21
7.9 FuseAssembly(GWX-205)
.... 21
3
5
6
6
8
8
9
I
10
'a"l
8. EXPLODED
VIEWS
8.1 External
Part
8.2 Internal
Part
9. Packing
Additional
Service
Manual
CONTRAST
OF
MISCELLANEOUS
PARTS
. .
SCHEMATIC
DIAGRAMS,
P.C.BOARD
PATTERNS
AND PARTSLIST
2.1 Schematic
Diagram 29
2.2 AFAmplifierAssembly
(GWK-121)
. ..... 31
2.3 MeterandSpeaker
Assembly
(GWS-147)
. . . 36
2.4 InputAssemblv(GWX-2081
........... 37
22
23
25
27
't1
12
14
17
CONTENTS
FRONT
PANEL
FACILITIES
SPECIFICATIONS
BLOCK
DIAGRAM
DISASSEMBLY
.
PARTS
LOCATION
5.1 Front
Panel
View .
5.2 Rear
Panel
View .
5.3 Front
View
withPanel
Removed
5.4 ToP
View
6. ADJUSTMENTS
7. SCHEMATIC
DIAGRAMS,
P.C.BOARD
PATTERNS
AND
PARTS
LIST
7.1 Miscellanea
7.2 Schematic
Diagram
7.3 P.C.
Board
Connection
Diagram
7.4 Meterandspeaker
Assembly
(GWS-146)
' ' '

tI
I
I
I
I
I
2. SPECIFICATIONS
Semiconductors
Transistors ........ 20
Diodes. ....22
Amplifier
Section
Continuous
Power
Output
0f 25 watts*
per
channel,min.,at 8
ohms
from20
Hertzto
20,000
Hertzwithn0
morethan0.08
% tolal
harmonicdistortion.
ContinuousPower
Output
at 1 kHz
(both
channel
driven)
T.H.D.O.08o/s,8
ohms. . . . 28
watts
per
channel
Total HarmonicDistortion
(20 Hertzto 20,000Hertz,8
ohms)
continuousrated
power
output.
I3 watts
per
channel
power
output,8
ohms
. . . . Nomore
than
0.04%
1watt
per
channel
power
output,8
ohms . . . Nomorethan
0.03%
fntermodulationDistortion
(50
Hertz
:7,000Hertz
=4
continuousrated
power
output.
13watts
per
channel
poweroutput,8ohms
. . . .
I watt
per
channel
power
output,
8ohms
Output
Speaker
Headphones
DampingFactor
(20
Hertz
to 20,000Hertz,
8 ohms)
I
nput
(Sensitivity/l
mpedance)
PHONO. . 2.5mY
150
kilohms
TUNER. 150
mV/50
kilohms
AUX.. ..150mV/50kilohms
TAPEPLAY. .... 150mV/50kilohms
TAPEPLAY
(DlN
connector)
SA-506/HGmodelonly
. . . 150mV/50
kilohms
PhonoOverload
Level
(T.H.D.
O.1%,lkïzl
PHONO. 140 mV
Output
(Level/l
mpedance)
TAPEREC. .....150mV
TAPE
REC
(DlN
connector)
HG
model
only
30
mV/80kilohms
FrequencyResponse
PHONO
(
RIAA Equalization)
30Hzto ,l5,000H2
+0.5d8
TUNER,
AUX,
TAPE
PLAY
. . . . . 20Hzto40,000H2
+2dB
Tone
Control
BASS. .. +12d8,-10d8(100H2)
TREBLE +10d8,
-10d8
(10kHz)
Loudness
Contour
(Volume
control
setat-4OdB
position) +6dB(t
OOHzI
Humand
Noise
(lHF,short-circuited,
A network)
PHONO. . 76dB
TUNER,AUX,TAPE
PLAY
..... 92dB
Humand
Noise
(DlN:
Continuous
power/50
mW)
PHONO . . 66dB/58d8
TUNER,AUX,
TAPEPLAY 83d8/60d8
Miscellaneous
PowerRequirements
sA-s06/s,s/G...
sA-s06/HG
PowerConsumption
SA-506/HG.....
sA-s06/s,s/G...
Dimensions
110112012201240V
(switchable),
50/60H2
220
|
240
V
(swi
tchable),
50/60H2
240W
(max.)
78W
420(w)x1a7(H)x261(Dl
1
6-1
/2(w)xs-3/a(H
)x
10-l
/a(D)in
Nomorethan0.08%
Nomorethan
0.05%
No
morethan
0.03%
A,B,
A+B
Lowimpedance
30
:1)
Weight Without
package
. . 5.9kg
(131b)
With
package
. .. . 6.9kg
(151b
3oz)
Furnished
Parts
Fuse2A
(5A-506/5,
S/G
model
only)
Fuse1.2A
(5A-506/5,
S/G
model
only)
.......1
Operating
instructions
. . . . . . I
*Measured pursuant to Federal
Trade Regulation rule on Power
Amplifier.
Tlade
Output Claims
NOTE:
Specifications
and thedesign
subjectto possible
tion without noticedue
to improvements.

137
6
mV
3. BLOCK DIAGRAM
35.6dB -l
ol lkHz I|<_ -o7sd8
I voL!
Ful,rcroN
lf*t "l ll
PHONO
TUNER
AUX
I
TAPE
L PLAY
I
Reflective
tape
Meter cover tape
IO POI{ER
STAGÊ
4. DISASSEMBLY
REMOVE
BONNET(Fis.2)
Remove the two mounting screw at the left and
right sidesof the bonnet and remove the bonnet.
REMOVE
FRONT
pANEL(Fig.
2)
Pull off all knobs (except push buttons). Then
removeshaft nuts of FUNCTION and BASS.
Take out upper left and right screws
(2 screws)
of
front panel and remove.
REMOVE BOTTOMPLATE(Fig.
2)
Take out 4 screws shown in figure and pull
rearward to remove.
METER LAMP REPLACEMENT(Fig.
t)
1. Remove the front panel.
2. Pull the meter from the body (the meter and
panel stay are attached with double sided
adhesive
tape through sponge).
3. Peeloff the meter cover tape.
4. Peel off the reflective tape around the outside
of the meter.
5. Remove the meter lamp, usinga solderingiron.
6. Install the new lamp in the reverseorder to
removal. Fig.
1 Meter
lamp
replacement

sA-5c'6
to read out the rated
nominalimpedance
of
amplifier's
SPEAKERS
ance of the speak-
thefrequency. In order
connect an 9-ohm
Iand
the
treble
with
treblearestrength'
rned to the right and
the
left.
source
depends
on how
in thelistening
room
thespeakers.
You can
accordinglY
andadiust
VOLUMECONTROL
Usethiscontrolto adjust
theoutputlevelto thespeakers
andheadphones.Turn it clockwise
to increasetheoutput
level.
No
soundwillbeheard
if you
set
it to "0".
TAPEMONITORSWITCH
Depressthisbuttonwith a tapedeckwhich
is
connected
to theTAPEjacks
(REC
and
PLAY)when
you wantto
monitortheplayback
or recordingof a tape.
NOTE:
Releasethis button (OFF position)
whenlistening
to a
recordor a broadcast.
FUNCTION
SELECTOR
SWITCH
Set this switchto selectthe program
source.
Turn the
VOLUMEcontrol down firstbeforeselecting
a different
position while the sound from one program source
is
being
reproduced.
TUNER: When listening
to AM broadcasting
or FM
broadcasting.
PHONO: When
playing
a record
on theturntable
con-
nected
to the
PHONO
jacks.
AUX: When
listening
to an audiocomponent
con-
nected
to the
AUXjacks.
LOUDNESS
SWITCH
Depress
this
button(ON
position)
whenlistening
atalow
volume.
The frequency
reiponse
of the human
ear
varies
according
to thelistening
volume,
and
setting
thisswitch
to the ON position
compensates
for hearing
response
by
emphasizing
thebass.
BALANCE
CONTROL
Use
this controlto balance
the volume
of the left and
right channels.
First,however,
tune
in to theAM broad-
çast,
and
adjust
sothat the sound
appears
to comefrom
somewhere
exactly betweenthe two speakers'
lf the
sound
appears
to belouder
ontheright,
it means
that
the
volume
of the
rightchannel
is
higher.
Turn
the
BALANCE
control to the left and adiust.
Conversely,
if the sound
appearsto be louder on the left, it means
that the
volumeof the left channel
ishigher'
Therefore,
turn the
BALANCE
control
to the
right
and
adjust'

1. FRONT PANEL FACILITIES
POWER
INDICATOR
When
thePOWER
switch
isset1o
ON,
thislamp
lights
up,
indicating
theamplifier
is
turned
on.
SPEAKER
SELECTOR
SWITCHES
Depress
the button corresponding
to the speakers
con-
nected
to theSPEAKERS
terminals
(A or B)on therear
panel.
You candepress
both of these
buttons
to listento
sound
from two Pairs
of systems
atthesame
time.
POWER
SWITCH
Flipthis
switch
to theONposition
tosupply
power
to the
stereoamplifier.
HEADPHONES
JACK
(PHONES
Plug
the headphones
into this jack when you wantto
listen
through
your
stereoheadphones.
Release
bothSPEAKERS
buttonsif youwantto listen
to
the sound
through
your headphones
only (Thismeans
that
both
buttons
will bereleased).
POWER
METERS
These
power
meters
allow
power level
when speakers
with
8ohms are connected to the
terminals.
These ualuesare related to the
ers and they uary according
to find out the exact outPut
dummy load insteadof the
BASS,
TREBLE
CONTROLS
Adiustthe
basswiththe
BASS
the TREBLE control.
The bass
ened when the controls
are
weakened
when
theyare
turned
Thesound
qualityof the music
the sound
isabsorbed
and
and also
on the characteristics
use
these
controlsto
thesound
to your preference.

6. ADJUSTMENTS
IDLE CURRENT
ADJUSTMENT
1. Set the VOLUME controls to the minimum
position, and set the SpEAKER switch to the
"4" position.
2. Connect an 8O load resistor
to speaker
terminal
A.
3. Connect a DC voltmeter between Tpz (+) ana
TPr (- ) (L channet)of Fig. B. Corrnect
the DC
voltmeter between Tpr (+l anOfpi 1_) at the
R channel.
4. S_et
the power switch to the ON position, and
check if the DC voltmeter reaaingis-
within the
JO.- ZO_ryVrange.
When
the uoitrnil;. reading
is
betow 10mV, cut jumper (A) ;;;1 channel.
_ 9yt jumper (B) for R àfrannet.
a. rJrsconnect
the DC voltmeter, andapply asignal
to the input terminals and confirm îhat thereis
no crossover
distortion in the output waveform.
Fig.
3 ldle
current
adjustment
I
DC
voltmeter

siA-E'cl6
o@._
h*
P^^ Bottom
plate
FUNCTION

5. PARTS LOCATIONS
o TJte
.,1 marh found on some component parts indicates
the importance of the safety facior ài-tii port. rn"r"-
f1yy, wlen reptacing, o"'rir"'ià- u,u"'p*i of identicat
designation.
5.1 FRONT
PANEL
VIEW
Push
knob (SPEAKERSI
AAD.154 Knob
(VOLUME)
AAB.178
Bon
net
ANE.19
LED
AEL-308 Front panel
assemblv
ANB-628
i;r AA8-180
Push
knob
(LOUDN
ESS,
TAPE
MONITOR)
AAD.154
Knob
(BALANCE)
AAB-t80
f , Recessed
ptug
{AC TNLET)
L-I AKP-OO8
fi Plue
in setector (2-positronl
a AKX-O57
Term;nat
(SpEAKERS)
AKE-026
"*'
Knob
(TREBLE)
AAB-180 a
I
o
5.2 REAR
PANEL
VIEW
Termînat
(tNpUT)
AKB.055
Terminat
(GND)
AKE-O31
Terminat
(TApE)
AKB.O54
DIN terminal
AKP-024

5.3 FRONT
VIEW
WITH
PANEL
REMOVED
Push
switch
ASG-143 Power meter
AAW-096
sA-E'oci
Variableresistor
(VOLU.ME)
ACV-184
Rotary
switch
(
FUNCTTON)
ASD-071
Variableresistor
(BALANCE)
ACT-118
Meter and speaker
assembly
GWS-146
Fuse
assembly
GWX-2O5
:)rrlil::r:'
Phone
jack
(PHONES)
AKN-023
Variableresistor
(BASS)
ACT-I17
5.4 TOP
VIEW
Volumeassembly
GWX.203
AF amplifier
assembly
GWK.120
INPUT
terminal
assembly
GWX-204
Variable
resistor
(TREBLE}
ACT-117
Push
switch
ASG-142
{tft l*
-;rSp,
rry

Typeof resistot
Power
rating
Shape
(tubuler)
Resistance
(code
value)
Tolerance
Low'noise
marking
f
Furthermore, in the list of parts found in the
ServiceManual, the resistance(ôode value) part of
It" "u"n" code number is expressed
as tr[n or
!DDtr.
Resistors included in the ServiceManual list of
parts I
EX. RD T/
PS
INT JNL
For further details on code numbers' refer to
"T\rning Fork" VOL. 1.
Ex.
1 For UtrDÛ Codes
* General
resistors
ÉÛtr
(10x
)
Ex.2 For f1trtr Codes
* Generalreeistors
trD!
-l-- T------------1
Signiticalnt
figures Multiplier
(10x)
* Resistorswith fractional valuel
Significant figures
Resistors
with fractionalvalues
n r-.1 n n-trtrRtr
U U TTTJ
Significant figures Decimal point
D
RESISTANCE
VALUE
CODES
Code numbers of resistors used in Pioneer
equipment are expressed
in the following way:-
code
number 1P4++++
"i?l]'JîiljlËi"
"il'ôo,.',"'
5R10
5R62
1oRo
22F.5
11fi)
1001
1
561
1oo2
3362
1123
1004
1564
510
562
100
225
110 x10o
1OO x10r
156 x10r
1æ x1O2
336 x1O2
112 x1O3
lOO xlor
156 xld
5.1
5.62
10
22.5
110
1k
(1000)
1.56k
(
1560)
10k
(10000)
33.6k
(33600)
112k
(1
120001
1M
(
10000001
1.56M
(
1560000l
F-1 r-l n nRfl
Significant
figures
'''il*îË#:i"
"Tl';îi"' oR5
1R5
010
220
331
102
562
68:l
824
105
225
05
15
01 x10o
22 xloo
33 x10t
lO x1O2
56 x103
6g x103
g2 x1o'
10 x105
22 x1o5
o.5
1.5
1
22
330
1k
{1000)
5.6k
(5600)
68k
(68000)
820k
(820000)
1M
(
1
0000001
2.2M
(2200æol
Significant
figures

{
I

METER LAMP
7
Fuse
Assembly
GWX-205
- Ktro PowER
---]? rNDjcAron
POWER
TRANSFORMER
POWER
SWITCH
LINE
VOLTAGE
SELECTOR
AC 220V
240V
5O
6OHz
Meter
and
Speaker
Assembly
GWS-146
SPEAKER A
SPËAKER
B
Bch
POWER METE R
POWEB
METER
Headphone
Assembly
GWX-202
7

SA-5OCi
4
VOLUf,E
coNli4
2q
raD
METER A SP AsÊ,y
GWS-t46
swrTCHE
s
Sl: POWER
OFF-ON
52:SPEAKER
A OFF-ON
53: SPEAKER
S OFF.oN
54: FUNCTION
I T(ilER
2 PHONO
3 AUX
SPEÂXER 9
s5: TAPEMONTTOR
QEf-ON
56 : LOUoil€SS gEE-ON
S7 : LINE VOLTAGE
S€LECTOR
| 220V
2 24OV
vâl lftBLE
cqYF4
vRa 9ass
coNl rcL
pq lcI
0205
@o7
o209
oztI
o2r3
D20ttsr555
D203
rs1355
VRa-! F228
D205STV-
ora
ra
5
o
s6-ù
lot 2scr626
to6 roE2
to7 EoaoF35R
,08 rsl555
,o9 lSt555
toz 2sct3t8
50r GP-20D
À to2 GP-2Oo
L{to3 GP-200
^,ro4 GP-2OO
"lo5 toE2
r o roE2
O 0056 vR!ù R22C
tol
Thrsis rh. bosic 3chafroticdiogrco,but rhc octuol circuit moy vory
Ê NOTED r:ka M,h du. ro ifrprovcmenl. in d.siga,
Thc lÀmqrk lound on soma compffonl porls indicotas thc imooilonca
of lha sotary focior ol tha pOrt tharafor!, whan retocing Da
surê ro usc pons ot idanticot d€gonotion
64
2sa798
zSCt9r9
2SCt43A
2SAA50
tsr555
lst555
sw-3H
thr undrrlincd Indicota3 lhc aritch Dgritio

1
7.2 SCHEMATIC
DIAGRAM
I
LFEC rÈfttl
rUXER
I Sohv I
f'$-ûvl
VOLUME Ass'y
GWX
- 203
AFAsst GwK-l20
l_ REc
I
'^[:..^,
oor tov Rlol a7
D:
D:
o:
o:
RESr
STORS
;
lN OHM
l/4w 15% ÎOLERANCE
UilUSS OTHERW|S
CJPÂCITORS;
lil rF UNL€SSOTHERWISENOTE0
p;pF
G: SIGNÂL
VOLTAGE
aT 25wx
2 84 OUTPUT
VJ DC VOLTAG€AT NOINPUT SIONT
MA : OC CURRENÎ
ÂT NO
ITPUT
SIGNAL
( V),OC
VOLTAGEÂT 25WI2 OIJTPUT
otot?sct9t9 QroS25A7265
5tt
oro2 2sct9r9 0to4 2sa726s
FUSE
Ass'y
6WX-
205
12

7. SCHEMATIC
DIAGRAMS,
P.
C. BOARD PATTERNS
AND PARTS LIST
NOTE:
o When ordering resistors,first convert resistance ualues into code form asshown in
the following examples.
Ex. I When there are 2 effective digits (any digit apart from 0), such as 560 ohm
and,
47k ohm (tolerance is shown by J = SVo,
and K = lOVo).
560a-56x10t-561 ... RDI/IPSEGIEJ
47ha-47)4101-473 ... RD\/IPSEAA@J
o.5sr-0î5 ..- ... RN2H@IE@K
1a-0to ._. .. RsrP@/n@K
Ex. 2 When there are 3 effectiue digits (such as in high precision metal film
resistors).
5.62ha 562x IOt 5621
. . ENVrS.R
Etd[lm r'
o The A mark found on Eomecomponent parts indicatesthe importance of the
safety factor of the pa.rt. Therefore, when replacing, be sure to use parts of
identical designa
tion.
7.1 MISCELLANEA
Miscellaneous
Parts
P.C.
BOARDASSEMBLIES
Part No. Description
FUSES
Part No. Symbol & Description
GWK.120
GWS-146
GWX.2O2
GWX.2O3
GWX.2O4
GWX-205
SWITCHES
PartNo.
AF amplifierassembly
Meter and speakerassemblv
Headphoneassembly
Volume control assembly
Input assembly
Fuse
assembly
Symbol & Dascription
l\ aer<oz
A,
AEK-o42
OTHERS
Part No.
FU1
.FU2 Fuse
T1A
FU3,
FU4 FuseT3.15A
Symbol&Doscription
I nrr-sss
AÉL.308 T1
D1 Power transformer
Diode (LED)
A AsA-sos
d,
arcx-osz
2SA726S
2SC1919
2SA798
ExternalAppearance
of Transistors
Lever
switch(POWERI
Line voltage selector (2-positionl
2SC1438
2SC1318
2S8616A
25D586A
s1
S7
Bt
ffii
2SA850
2SC1735
Ct
E"
Bz

o
l3
*
t"Ï
14 a.D
.1
â L3o5 1
I
1
0302
loo
J
11
ti
rt*
Ilo:rolors
t0EZ
'2
cP-?00
rl
(# n3o3
2.2K
{llV)
1"
È ç:o+
+
A
a7l3s
112
Ô
ll o--
--lo^
9-o
+ Cao3
*|4-a 8000i42
L- - -trin-
ïI
9
L2r3 I
\ LZTP
ffi+1I +tîr.
trqr
" fir85:
. f"3*_1 coNrRoL
8ct
7
.o-
c|l
150
(NP)
L,,'
I"^ EALANC€CONTROL
Vn?
500K
(HB)
f'9r'!-l
iti
rrl*l

789
Fuse
Assembly
GWX.2O5
Meter
and
Speaker
Assembly
GWS.146
HeadphoneAssembly
GWX-202
A
B
c
D
78I
o
I
a