Pioneer SA-5800 User manual

In this photo you can see Model SA-5800
Service
anual
STEREO AMPLIFIER
A-58S00
A-50&
Q) PIONEER’

Both
Model
SA-5800
and
Model
SA-508
have
the
same
basic
performance.
The
major
difference
is
in
appearance,
Model
SA-5800
being
fitted
with
wooden
side
cover
and
top
cover,
while
Model
SA-508
employs
metal
cover.
The
following
table
is
displayed
on
the
SA-5800
and
SA-508.
MODEL SA-5800
KU 120V only U.S.A, model
KC 120V only Canada model
MODEL SA-508
This
service
manual
is
applicable
to
the
KU
type
of
the
Model
SA-5800
and
the
Model
SA-508.
When
re-
pairing
the
KC
type
of
the
Model
SA-5800
and
the
S
type
of
the
Model
SA-508,
please
see
the
additional
service
manual
(ART-373),
and
for
HE, HB,
HP
types
of
the
SA-508,
please
see
the
additional
service
manual
(ART-374).
CONTENTS
1.
SPECIFICATIONS
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9.
SCHEMATIC
DIAGRAM,
P.C.
BOARD
2.
FRONT
PANEL
FACILITIES..............
4
PATTERNS
AND
PARTS
LIST
3.
BLOCK
DIAGRAM.................-...
6
9.1
Miscellanea
..
2...
.
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ee
14
4.
CIRCUIT
DESCRIPTIONS................
6
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“Schematic
Disgaea
awsansie
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bis
5.
DISASSEMBLY
.........---c0--ee-
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8
9.3.
P.C.
Board
Connection
Diagram..,......
18
6.
ADJUSTMENTS.
.........--00e
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9
9.4
Parts
List
of
P.C.
Board
Assemblies.......
21
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23
SEVERODED
VIEW
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11.
SUPPLEMENTS
FOR
MODEL
SA-508/KU.....
23

1. SPECIFICATIONS
Semiconductors
ICS ci ieee he oS oR ee See en MA aa eae 3
TETANSIStOPS <4. 8. eb oe BA els ee Ee eck 24
DIOdES. wie ekg oe ete et in eed Cee ELS 18
Amplifier Section
Continuous Power Output of 25 watts* per
channel, min., at 8 ohms from 20 Hertz to
20,000 Hertz with no more than 0.03 %
total harmonic distortion or 25 watts per
channel at 4 ohms from 20 Hertz to 20,000
Hertz with no more than
harmonic distortion.
Total Harmonic Distortion (20 Hertz to 20,000 Hertz,
8 ohms, from AUX)
continuous rated power output .. No more than 0.03%
12.5 watts per channel power output
Bitrate ale senses Md hte suatSs No more than 0.03%
0.05% _ total
i hace te tee eto aes No more than 0.03%
Intermodulation Distortion (50 Hertz: 7,000 Hertz = 4:1,
8 ohms, from AUX)
continuous rated power output .. No more than 0.03%
12.5 watts per channel power output
SEEACRESAE aa ae Baus S74 No more than 0.03%
te Dad canoe inch ch noes No more than 0.03%
Output
SPOaken sescescw ge dees WA RAG aden eee ae A, B, A+B
4~16 ohms
Headphones..............00055 Low impedance
Damping Factor (1,000 Hertz, 8 ohms)........... 30
Input (Sensitivity/Impedance)
PHONO? 6.05 snide See tren hed Beek & 2.5mV/47kilohms
TUNER: 2 fn. ee a eee ete 150mV/S50kilohms
AUX 23.5 Spee oe Se Ee oes eek 150mV/50kilohms
TAPE:PLAY © os ecdee es dete tenet 150mV/50kilohms
TARE PEAY 200.0 ch oan ee a? 150mV/50kilohms
Phono Overload Level (T.H.D. 0.1% 1,000Hz)
PHONO? 0 2 seca tnaeeu sete Ss oes 140mV
Output
TAPE RECA. oug wie iat Srentnscihen ed anh eves Jeane 150mV
TAPE REG 2... ge tee ead ks kd ae 150mV
Frequency Response
PHONO (RIAA Equalization)
ot, ase ae Fe 30Hz to 15,000Hz +0.5dB
Da Gua? Bae eas 20Hz to 40,000Hz +2dB
Tone Control
BASS ss ws Pace ee eds +7,5dB, — 7.5dB (100Hz)
TREBLE + -i6 gs aeeceshess +8dB, —8dB (10kHz)
SA-5800
Subsonic Filter... ...........0004 15Hz (—6dB/oct)
Loudness Contour (Volume control set at -40dB
POSITION) 06 pears Gal Se Sle Kg Bob wens +6dB (100Hz)
Hum and Noise (IHF, short-circuited, A network)
PHONO) 3. csv beso ee a oe 3 ee a 76dB
TUNER, AUX, TAPE PLAY............... 98dB
Miscellaneous
Power Requirements ...............65 120V, 60Hz
Power Consumption ......... 75W (UL), 180W (CSA)
Dimensions .......... 451(W) x 151(H) x 271(D)mm
17-3/4(W) x 5-15/16(H) x 10-11/16(D) irr
Weight
(without
package)........---
7.3kg
(16lb
20z)
Furnished parts
Operating instructions... 2... 0.0... eee ee eee ]
* Measured pursuant to Federal Trade Commission’s
Trade Regulation rule on Power Output. Claims for
Amplifiers.
NOTE:
Specifications and the design subject to possible modifi-
cation without notice due to improvements.

2.FRONT
PANEL
FACILITIES
@® POWER SWITCH
Set
this
switch
to
ON
to
supply
power
to
the
amplifier.
@ SPEAKER SELECTOR
Use
this
selector
to
select
the
speaker
systems.
OFF:
Sound
not
obtained
from
speakers.
A:
Sound
obtained
from
speakers
connected
to
the
A
speaker
terminals.
B:
Sound
obtained
from
speakers
connected
to
the
B
speaker
terminals.
A+B:
Sound
obtained
from
speakers
connected
to
both
A
and
B
speaker
terminals.
@ POWER METER
This
meter
allows
you
to
read
out
the
rated
power
level
on
the
fluorescent
display
tube
when
speakers
with
a
nominal
impedance
of
8
ohms
are
connected
to
the
amplifier’s
speaker
terminals.
@ FUNCTION INDICATORS
The
TUNER,
PHONO,
AUX
function
indicators
light
up
in
accordance
with
the
position
of
the
function
selector.
NOTE:
The
function
indicator
will
not
go
off
even
when
the
tape
monitor
switch
1
or
2
is
set
to
ON.
@ LOUDNESS SWITCH
When
listening
to
a
performance
with
the
volume
control
turned
down,
set
this
switch
to
ON
and
the
bass
will
be
accentuated.
When
the
volume
is
low,
the
human
ear
finds
it
harder
to
hear
the
bass
than
when
the
volume
is
high.
The
loudness
switch
is
thus
designed
to
compensate
for
this
deficiency.
By
setting
it
to
ON,
the
bass
comes
through
much
more
strongly
and
the
sound
takes
on
a
punch
even
when
the
volume
control
is
turned
down.
: ae

© VOLUME CONTROL
Use this control to adjust the output level to the
speakers and headphones. Turn it clockwise to
increase the output level. No sound will be heard
if you set it to “0”.
@ HEADPHONE JACK
Plug the headphones into this jack when you
want to listen through your stereo headphones.
NOTE:
Set the speaker selector to OFF when listening only with
headphones.
(8)
BASS
AND
TREBLE
CONTROLS
Use these controls to adjust the bass and the
treble. If you turn the bass control to the right
from its center position, you will be able to
emphasize the sound in the low-frequency range.
Conversely, turning this control left from the
center position, you will attenuate the sound.
You can use the treble control to adjust the
sound in the high-frequency range.
@ BALANCE CONTROL
Use this control to balance the volume of the left
and right channels. If the sound appears to be
louder on the right, it means that the volume of
the right channel is higher. Turn the balance
contro! to the left and adjust.
Conversely, if the sound appears to be louder on
the left, it means that the volume of the left
channel is higher. Therefore, turn the balance
control to the right and adjust.
SUBSONIC FILTER SWITCH
When this switch is set to the 15Hz position, the
subsonic filter with a cut-off frequency of 15Hz is
actuated. The subsonic filter serves to attenuate
frequencies lower than 15Hz in a 6dB/oct slope.
It is therefore effective in suppressing ultra-low-
frequency noise which is generated by record
warp and other causes. You cannot actually hear
this noise but it is a factor in the generation of
intermodulation distortion and it may damage
your speaker system. Set this switch to the 15Hz
position during record play for the best effect.
SA-5800
d) FUNCTION SELECTOR
Use this selector to select the program source.
When set, the function indicator above the meter
panel corresponding to the position of the func-
tion selector will light up.
TUNER: Set here when listening to broadcasts
on a tuner connected to the TUNER jacks.
(The TUNER function indicator lights up.)
PHONO: Set here when playing records on a
turntable connected to the PHONO jacks.
(The PHONO function indicator lights up.)
AUX: Set here when listening to a program
source which is connected to the AUX
jacks.
(The AUX function indicator lights up.)
42 TAPE MONITOR SWITCHES (1, 2)
Use these switches to monitor recording or a tape
being played back on a tape deck.
1: Set this switch to ON when you want to
monitor a recording or a tape being played
back on a tape deck which is connected to the
TAPE 1 jacks.
2: Set this switch to ON when you want to
monitor a recording or a tape being played
back on a tape deck which is connected to the
TAPE 2 jacks.
NOTE:
Set these switches to the upper (OFF) position when
playing records or listening to broadcasts.

3.
BLOCK
DIAGRAM
fy
ae
PHONO
AUX
TUNER
REC PLAY REC PLAY
TAPE i TAPE 2
REC PLAY REC PLAY
R CHANNEL
RECTIFIER
} TO FLHEATER
4.
CIRCUIT
DESCRIPTIONS
Equalizer Amplifier
The
equalizer
amplifier
is
collector-to-emitter
feed
back
type
2-stage
direct-coupled
amplifier,
designed
with
a
gain
of
35.5dB
(at
1kHz),
a
over-
load
level
of
140mV
(at
1kHz,
THD
0.1%),
and
equalizer
deviation
of
+0.5dB
(30Hz-15kHz).
Power Amplifier
This all-stage direct-coupled pure complemen-
tary
SEPP
circuit
features
a
current
mirror
load
differential amplifier in the first stage, and in-
corporates the tone control circuits in the NFB
loop.
Although the incorporation of the tone control
circuits in the power amplifier stage reduces the
number of elements that the signal has to pass
through, and thereby further reduces noise, distor-
tion, and cost, the power stage does require a
higher gain and a higher degree of stability. In the
SA-5800, this high gain and high stability are
achieved by a current mirror load differential
amplifier in the first stage and by the use of a
bootstrap circuit for the load of the pre-driver
stage.
The power stage is a Darlington connection pure
complementary SEPP circuit, resulting in an
output power rating of 25W+25W (82, 20Hz-
20kHz, THD 0.03%).
ln 39.548
VOLUME | at IkHz
( SAME AS
VOLTAGE
REGULATOR
CONTROL
SUBSONIC
FUNCTION
© SPEAKER
lL
CHANNEL)
ore
.
© SPEAKER B
} TO POWER STAGE
TO
EQ
AMP,
POWER
AMP,
INDICATOR
DRIVE
CIRCUIT
The tone controls (BASS, TREBLE) are operat-
ed
by
changing
the
frequency
response
of
the
power amplifier NFB circuit.
Power Supply Muting
This
circuit
is
designed
to
eliminate
the
un-
wanted
click
noise
generated
when
the
power
switch
is
turned
on
and
off.
With
reference
to
Fig.
4-1,
when
the
power
switch
is
turned
on,
Q;
will
remain
off
because
of
-B,,
and
then
Q,
emitter
will
become
—0.6V
through
the
minus
voltage
supply
route
(D,,
D3,
and
R,,.).
The
Q,
base
voltage
will
increase,
the
rate
of
increase
being
determined
by
the
R2,
R;,
TO EQ AMP,
FIRST STAGE
OF POWER AMP.
POWER
ac -
LINE | :
TO POWER
STAGE
Fig. 4-1 Power supply and muting circuit

and C; time constant. Consequently, Q, emitter
voltage will rise by increase of the base voltage.
Therefore, the muting action when the power
switch is turned on is achieved by delaying the
supply of the +B, to the equalizer amplifier and
the first stage of the power amplifier.
When the power switch is turned off, the —B, is
discharged through the route R,;—> C,, and since
the residual voltage of C, is then applied to the
base of Q, through R, and R;, Q; is immediately
turned on. Therefore, the base voltage of the Q,
drops to OV, and the +B, supply to the equalizer
amplifier and the first stage of the power amplifier
are interrupted.
Indicator Circuit
The SA-5800 output power and function indi-
cators feature fluorescent indicator tube (FL
tube). In this tube, thermionic emissions from
the cathode are accelerated into the fluorescent
substance of the segmental anodes, resulting in the
emission of light. This tube is used to indicate
numerals, letters, and other symbols.
IC (TA73IGP) 172
SIGNAL INO
FLUORESCENT
FILAMENT
SA-5800
An outline of the FL tube drive circuit is shown
in Fig. 4-2. The output circuit signal is applied to
pin no. 6 (4) of the IC (TA7318P-A). The IC
contains a detector circuit, compressor (40dB),
and peak hold circuit for both left and right chan-
nels. The dynamic range of the signal is thus
contracted by 40dB to obtain a ‘‘peak held” DC
voltage.
The output power indicator segments of the FL
tube are driven by the HA12010 ICs (one for
each channel) equipped with 12 pairs of differen-
tial amplifiers. These amplifiers are biased at in-
creasing levels, so each amplifier will commence
to operate separately as the input level increases.
And since these amplifiers apply the voltages to
the output power indicator segments, each suc-
cessive segment will light up in turn as the input
level rises.
The function indicators are lit up as a result of a
voltage being applied to the corresponding func-
tion indicator segment according to the selected
positions of the FUNCTION switch.
INDICATOR TUBE
Fig. 4-2 Indicator circuit

5. DISASSEMBLY
Side Covers and Top Cover
1. Remove the four screws (A), and remove the
left and right-hand side covers.
2. Remove the two screws (B), and remove the
top cover.
Bottom Plate
Remove the four screws (C).
Front Panel
Pull off all the knobs, and remove the four nuts
(D).
Side cover
Front panel
Side cover

SA-5800
6. ADJUSTMENTS
Idie Current Adjustment
1.
Tum
the
VOLUME
control
down
to
minimum
level,
turn
the
power
on,
and
wait
about
10
minutes.
2.
Connect
a
DC
voltmeter
to
the
TP
terminals
(L
ch;
TP,
@®
and
TP,
©,
R
ch;
TP;
®
and
TP,
©)
of
the
GWK-128.
3.
Check
that
the
voltage
between
TP,
and
TP,
(L
ch)
lies
within
the
DC
4.4mV-35mV
range.
Then
make
a
similar
check
for
the
R
ch
(be-
tween
TP;
and
TP,
).
If
the
voltage
is
less
than
4.4mV,
cut
jumper
A
(L
ch),
and
jumper
B
(R
ch).
If
the
voltage
exceeds
35mV,
check
for
circuit
failure.
Jumper A Jumper B
Fig. 6-1
Output
Indicator
Adjustment
1.
Set
the
tone
control
to
the
flat
position.
2.
Set
the
SPEAKERS
selector
to
the
A
position,
and
connect
an
82
resistor
and
AC
voltmeter
to
the
speaker
output
terminals.
@—
vr,
3.
Set
the
FUNCTION
switch
to
the
AUX
posi-
©—vr,
tion,
and
apply
a
1kHz,
150mV
signal
to
the
AUX
input
terminals.
4.
Adjust
the
VOLUME
control
so
that
the
volt-
© ©
age
on
the
output
terminals
(SPEAKERS)
reads
9V
(AC).
5.
Adjust
VR,
(Lch)
and
VR,
(R
ch)
of
the
indi-
Cator
assembly
so
that
the
output
power
indi-
Fig.
6-2
cator
reads
10
watts.
Indicator assembly
Panel stay

e The A\ mark found on some component parts indicates
7.
PARTS
LOCATION
the
importance
of
the
safety
factor
of
the
part.
There-
fore, when replacing, be sure to use parts of identical
Front Panel View designation.
Front panel assembly Lever knob
ANB-736 AAD-183
Knob Knob
AAB-204 AAB-202
Lever knob
AAD-183
Lever knob
AAD-183
Knob
Knob AAB-203
AAB-204
Lever
knob
AAD-183
Front View with Panel Removed
Fluorescent indicator tube Lever switch (LOUDNESS)
AAV-004 ASK-155
Variable resistor
Rotary switch
(SPEAKERS)
(VOLUME)
2
Lever
switch
Lever switch (TAPE MONITOR 1, 2)
(POWER) ASK-156
ASK-514
8
Slide
rotary
switch
(FUNCTION)
Pa (PHONES) ASE-110 ;
Variable resistor (BASS) re a {SUBSONIC)
ACT-117 :
Variable resistor (TREBLE Variable resistor (BALANCE)
ACT-117
ACT-118
10