Pioneer SX-626 KCW User manual

<ART-027-0>
SERVICH MANUAL
AM /FM STEREO RECEIVER
SX-626
KCW, KUW, FVZW, NBW, FW
NOTE:
MODEL SX-626 COMES IN FIVE VERSIONS DISTINGUISHED AS FOLLOWS:
Round label on
rear panel
120V only CSA approved (Canada)
KUW 120V only UL approved (U.S.A.)
FVZW
5-position
selector
FTZ
approved
(West
Germany)
NBW 220V only SEMCO (Sweden), NEMCO
(Norway) and DEMCO (Denmark)
approved
FW 5-position selector General export model
| with de-emphasis selector switch
—
owe
WQPIONEER

Ook WN a
10.
11.
SxX-626
CONTENTS
SPECIFICATIONS
2...
ce
ee
ee
eee
3
FRONT
PANEL
FACILITIES
.......-
2
ccc
eee
reer
eer
ee
eee
5
CONNECTION
DIAGRAM
......
eee
ee
eee
es
7
BLOCK
DIAGRAM
_..........
ee
eee
eee
9
DISASSEMBLY
.....
eee
eee
ee
ee
ee
ee
11
PARTS AND P.C. BOARD LOCATION
6.1
Top
View
...
cee
eee
eee
eee
eee
eee
ee
12
6.2
Bottom
View
......
20.0
ee
eee
eas
13
ALIGNMENT PROCEDURE
7.1
Required
measuring
instruments
©...
-
++
eee
ee
eee
ee
eee
14
7.2
AMadjustment
2.2...
eee
ee
eee
eee
tee
ee
ee
ees
14
7.3.
FMadjustment
.....
0.0
eee
eee
eee
eee
ee
eens
14
DIAL
CORD
STRINGING
..
ww
ee
ee
ee
et
ee
ee
es
15
PACKING
METHOD
AND
PART
NUMBERS
.....-----+
ess
errr
res
16
EXPLODED
VIEW
AND
PARTS
LIST
2...
eee
eee
eee
eee
eens
16
SCHEMATIC
DIAGRAMS,
P.C.
BOARD
PATTERNS
AND PARTS LIST
41.1.
Circuit
Connection
Diagram
and
Miscellaneous
Parts
....----+-->
21
11.2
Tuner
Assembly
(AWE-031)
.....
0.20
eee
eee
ete
nee
eee
26
11.3
Equalizer
Amplifier
Assembly
(W21-004)
.....
0.00
eee
eens
32
11.4
Control
Amplifier
Assembly
(AWG-008)
.....----0e
eee
eee
35
11.5
Power
Amplifier
Assembly
(AWH-002)
(AWH-013)
........-+5:
38
11.6
Power
Supply
Circuit
Assembly
(AWR-029)
...---+-
eee
e
ees
42
11.7
Switch
Circuit
Assembly
(AWS-013)
«0...
eee
ee
ee
ee
es
44
11.8
Switch
Circuit
Assembly (AWS-014)
2...
eee
ee
eee
45
11.9
CR
&
Meter
Drive
Assembly
(AWM-050)
ww
ww
ee
ee
ee
eee
46

“ho i
A A
NOTE:
This SX-626 Service Manual applies to:
1)
All
the
models
with
IC-indicated
round
label
each
attached
above
the
power
cords on the rear panels (see page 8); and
2)
The
following
five
models
at
which
the
respective
sequence
numbers begin:
KUW
model
.........
sowie,
Ge
eo
aioe
e
Cee
hue
ees
No.
3744801
KCW
model
...
2...
ee
ee
ee
ee
et
te
eee
No.
3504201
FVZW
model
........2.-
20
eee
ee
eee
eee
No.
1612501
NBW
model
..........
022+
e
eee
eres
...
No.
4301401
BPW
modell
feces
ae
ie
MS
See
a
ee
No.
1212001

1. SPECIFICATIONS
SEMICONDUCTORS
a
IOs
“A
edie
sad
kettle
pate
Transistors
.....
ated
cates
Diodes
2.
ia
ee he
eG
es
POWER
AMPLIFIER
SECTION
Music
Power
Output
(IHF)
...---
Continuous Power Output ....+.-
{each channel driven)
Continuous
Power
Output
.....--
(both
channels
driven}
Power Output in the range of
QOHZ
to
2OKHZ
wee
ee
eee
(both channels driven)
Harmonic
Distortion
...-..--+--
Intermodulation
Distortion
....--.
Power
Bandwidth
(IHF)
......-.
Frequency
Response
.....-++-+>
Input
Sensitivity/Impedance
....-.
(1kHz, Continuous power output)
Speakers
.-
eee
eee
ee
es
Damping Factor .....-- eee eee
PREAMPLIFIER SECTION
Output
Voltage
..--
eee eee
eee
Harmonic Distortion ........--5
Frequency Response ...-..++++>
Input Sensitivity/Impedance ......
(1kHz, for rated output}
Recording Output. .., +--+ eee
BASS Control ... 0.250 eee
TREBLE Control .....-.-200-6-
LOW Filter 2... ....222 eee eee
HIGH Filter .-....--02-500 eee
Equalization Curve ....--.....--
Loudness Contour .......+0+06-
Hum and Noise (IHF) ........-5
110Watts (4Q)
76Watts (8Q)
40W/40W (4Q)
32W/32W (8Q)
30W + 30W (422)
27W + 27W (822)
20W
+
20W
(8Q,
Harmonic
distortion
fess
than
1%)
Less
than
1%
(Continuous
power
output)
Less than 0.09% (16W/16W, 82 output)
Less than 1% (Continuous power output)
Less
than
0.4%
(16W/16W,
82
output)
10Hz
to
70kHz
(89,
Harmonic
distortion
less
than
1%)
5Hz to 80kHz, + 1dB
500mV/60kQ2. (MAIN IN)
4 to 162
40 (8Q2, 1kHz)
500mV (Rated output), 3V (Max.)
Less than 0.5%
15Hz to 20kHz, +1dB
PHONO 1. 2.5mV/45kQ
PHONO 2 2.5mV/45kQ
MIC 2.2mMV/22kQ
AUX 200mV/100kQ2
TAPE MONITOR 1, 2 200mV/70k{2
TAPE REC 1, 2 (Pin jack) 200mV
TAPE REC (DIN connector) 35mV
—11 dB, +11 dB/100Hz
—11 dB, +10.5 dB/10kHz
—8dB/50Hz (6dB/oct.)
—9dB/10kHz (6dB/oct.)
PHONO: RIAA S.T.D.
+10dB/100Hz,
+6dB/10kHz
withVolume
Control!
set at —40dB position.
PHONO More than 85dB
AUX More than 95dB
FM TUNER SECTION
F requency Range ......-..
Usable
Sensitivity
(IHF)
....
Capture
Ratio
(IHF)
.....-.
Selectivity
(IHF)
......---
Image
Rejection
.........
IF
Rejection
...---
eee
&
Spurious
Rejection
....-.---
AM
Suppression
...+-+----
Signal-to-Noise
Ratio
....-.
Harmonic
Distortion
......
Tuning
Indicator
....+-+--
Muting
2...
0-0
eee
eee
eee
Stereo
Separation
....--+-+-
Sub
Carrier
Suppression
.....
De-emphasis
Switch
..-----+>
Antenna
Input
...----.--
AM TUNER SECTION
Frequency Range......-.-+
Usable
Sensitivity
(IHF)
....-
Selectivity (IHF) .........-
Image Rejection ...-..+---
{F Rejection ..........-.
Signal-to-Noise Ratio ....-.
Antenna .....-2 ee ee eee
MISCELLANEOUS
Power Requirements......-.-
Power
Consumption
.......
Dimensions
(overall)
......-
NOTE: Specifications and the
due to improvements.
SX-626
.... 88MHz to 108MHz
87.5MHz
to
108MHz
(FTZ
approved)
2... 2.0nV
.... 2,.5dB
.... More than 70dB
_...
More
than
80dB
(98MHz)
....Mono:
Less
than
0.4%
(100%
Mod.)
Stereo: Less than 0.5% (100% Mod.)
. ... Signal strength type
.... Switchable to ON-OFF
....+ More than 40dB (1kHz)
.... More than 50dB
....
5Ou
sec.,
75
sec.
(FW
model
only)
....
Impedance
300Q
balanced
and
75Q
unbalanced.
.... 525kHz to 1,605kHz
2. es TOV
.... More than 30dB
.... More than 80dB (1,000kHz)
.... More than 70dB
.... More than 50dB
....
Built-in,
Ferrite
Loopstick
Antenna
....
120V
60Hz
or
110V,
120V, 130V,
220V
and
240V.
(Switchable)
50
—60Hz
.... 170W (Max.)
.
oes
17-11/16in./450mm
(width)
5-11/16in./145mm (height)
14-3/16in./360mm (depth)
.... Without package: 21Ib. 1302z/9.9kg
With package: 26lb. 70z/12kg
.... FM T-type Antenna 1
Pin Plugs 2
Speaker Plugs 6
Polishing cloth 1
Operating Instructions 1
design
subject
to
possible
modification
without
notice

2. FRONT PANEL FACILITIES
SPEAKERS SWITCH
A combination of the power on/off switch and the speaker system
selector switch. ;
POWER OFF .... The equipment is dead.
Ai aipemwced Sound comes through the speaker system plugged
into the A speaker sockets.
SPKR OFF. .. No sound comes from any speaker system.
Useful for listening through headphones.
Boe smatvieaecntee Sound comes through the speaker system plugged
into the B speaker sockets,
Cais thon Oey 4 ».. Sound comes through the speaker system plugged
into the C speaker sockets.
APB oc Scere Both A and B speaker systems are energized.
At Gv enaes Both A and C speaker systems are energized.
PHONES JACK.
Use this to plug in stereo headphones.
A full selection of high-performance headphones is available from
Pioneer.
BASS & TREBLE CONTROLS
SIGNAL METER
Meter for indicating receiving signal strength.
STEREO INDICATOR
This indicator will light up when the broadcast is in stereo.
{ STEREO RECEIVER MODEL Sx-626
A aM om PHONO vc aux strAio
FM
FLAT FLAT NORM
SPKR OFF Bg Nera eee oars FILTER muTING a
Contro! bass and treble. Turning each control clockwise from the FLAT
position will boost the tone, and turning it counterclockwise will
diminish the tone.
FILTER SWITCHES
LOW: Setting this switch to ON will eliminate low frequency noises,
‘such as record rumble, hum, or other interference. The switch
is normally set to OFF unless the filter is required.
HIGH: = Setting this switch to ON will eliminate high frequency noises,
such as record scratch, hiss static noise from fluorescent lamps,
or. other interference. The switch is normally set to OFF
unless the filter is required.
FM MUTING SWITCH
This switch is used to suppress much noise between FM stations while
tuning.
In a fringe area, however, this switch should be kept off in order not
to suppress the desired station signal at the same time.
BALANCE CONTROL
This control balances the volume of the left and right speaker systems.
Where the volume from the right-hand speakers is too low, turn it to
the right (clockwise), Where the volume from the left-hand speakers is
too low, turn it to the left (counterclockwise).
These switches are set to ON for test-listening of recording in progress
or playback of recorded tapes with tzipe decks.
1— This switch is set to ON for using a tape deck plugged into TAPE
1 MON jacks and TAPE 1 REC jacks or TAPE REC/P.B.
connector,
2— This switch is set to ON for using a tape deck plugged into TAPE
2 MON jacks and TAPE 2 RECijacks.
NOTE: For a normal record playback or listening to broadcasts, leave these
switches set to the OFF position. If the switches are set to ON, sound
will not be produced from spsakers.
5 \ eee
rae \
Severuessimestiyrrcianen dup stae Qh se teH@usttt FED C@ULHtEPLEAZPELELOCHSBDFELTOLCCOETUESSTERO 37K AZ. y
k o wt a w 8 wr
i ‘) a 2
| SPEAKERS BASS TREBLE BALANCE VOLUME
SELECTOR
LOUDNESS TAPE MODE f— FM AUTO
MONITOR STE MONO PHONO! )
TUNING KNOB
Used to select desired stations.
; enn ne. 4. LOW HIGH {™%. v4 = \ = 4 2 REO ay @ Prone q
6 PHONES | ; XY Ms QZ a Ne, AUX
@® nine PUSH ONT Vert | RIGHT min | MAX PUSH ON4 -=MDNO @
MIC JACK
Accepts the plug of the microphone. Use a high-impedance, dynamic
microphone with a standard plug.
: SELECTOR SWITCH
i
This
switch
is
used
for
choosing
the
program
source.
: AMi veo. 3 eons AM reception.
: FM MONO.. FM monophonic reception only.
FM AUTO .. FM reception by automatic switching for either stereo or
monophonic program.
; PHONO 1... For playing records on a turntable plugged into the
VOLUME CONTROL ————: PHONO 1 jacks. ;
To increase the volume, turn it to the right (clockwise). PHONO 2... Same as above, for PHONO 2 jacks.
| MIG 26 wae Microphone sound can be reproduced.
LOUDNESS SWiITCH———_—— AUX ...... For playing signals fed to the AUX jacks.
To listen to quieter sound, set this to the ONposition. This emphasizes MODE SWITCH
the low and high notes, For normal listening, set it to the OFF position. P
| STEREO: When set to STEREO, stereo sound is present.
TAPE MONITOR SWITCHES q and 2) MONO: When set to MONO, the left and right channel
signals blend into monophonic sound.
=P,
sin sapneaneircnpemenetinire att

:
SX-626
|
3.
CONNECTION
DIAGRAM
:
[—————
SPEAKERS
A
SPEAKERS
B
SPEAKERS
C
FM
OUTDOOR
ANTENNA
FM T-TYPE ANTENNA
[Pe ad Matt a ee ea a AO aa eee nae
7
3002
FEEDER
Dee
ere
te
eee
PROTECTION FUSE 2A
75Q.
COAXIAL
a
AM
ANTENNA
CABLE
PROTECTION
FUSEAIM
FERRITE
ANTENNA,
F
me
@«
LEFT
75
UNBAL
3009
BAL
GND
|
=
©)
O}
CO)
@
©
ie
@
RIGHT
CES
5 dipeers
Connect to ground termi-
nals of turntables, tape
decks, etc.
mm
TURNTABLE
..
)
L R oOL
r:
TAPE1;
=
TAPE2
5
~
AC
OUTLETS
—
ce
AUX
MON
REC
MON
REC
LIN
TAPE
REC/PB
SWITCHED
©
:
See S > & i, oe :
ach
ee
Sooue
:
out
i
ij
(|
PRE
&
MAIN
PLUGS
it
TURNTABLE
When
these
plugs
are
unplugged,
the
I
POWER
CORD
-
-
=
ras
1 OO |
preamplifier
and
main
(power)
amplifier
=
:
L.
Aine
;
Saaees
&
!
;
is
jf
i
function
separately.
This
is
useful
fOr
eUSE
2A
AC
OUTLETS
eS
assembling
a
multi-amp
system
with
the
oov
det
5V
Aci
mode
mode
aid
of
an
electronic
crossover
networks
a
2A
110V.
1A
220V
(Pioneer
SF-500,
SF-700,
for
example).
120V
240V
130V
i
LINE
INPUT
LINE
OUTPUT
CARTRIDGE TAPE PLAYER
'
{
I 1
\ ‘
{
i
INPUT
Cm O°
:
¢ OBO O Oe
|
With
the
4-channel
decoder
i
|
PIONEER
4-CHANNEL
l
|
|
amplifier QL-600A and two
more speakers (separately
DECODER:
AMERIRIER
:
available),
a
4-channel
stereo
QL-600A
!
system
can
be
assembled
as
occ @ ME o--- ooe@ ME e---
® LS A TS
TAPE
DECK
TAPE
DECK
REAR
SPEAKERS
|
shown
in
this
illustration.
J)
oo
|

4. BLOCK DIAGRAM
MON S
TAPE? | en é—
MON S
TAPE 1 4
REC
AUX
+» PHONO 2 S
t= PHONO 1 &
igh
t
<- PHONO 2
c& PHONO 1
Os.
—s S249 8) %po
EQUALIZER AMP ASS’Y
Ay (W21-004)
AUX S
é o>
TAPE 1 Bee x
— MON a
Tape 2 [ REC g
L. MON ©
I Si: POWER
S52 SELECTOR
$3 SPEAKERS
BD,
DIAL SCALE LAMPS |
aa TR x METER
DRIVE ASS’Y 3
tM)
|
CAWM-050)
2
Yo
: fo)
¥
{
°
1
fe}
x
Ww
|
SIGNAL
ea@
@
af]
I
|
DIAL
POINTER
3 | o |Se2
| 10/0
a WA |
{ : |
eh
So
AUX
MIC
PHONO
FM_AM
i SELECTOR POSITION
| Poe
| Vad) ? me Wi
Da De | Sill
Oy y_ 4 O— || POWER SW
aE STER ICA HH -ro-OD—
Ho
5°
EO
INDIC
TOR
°°
ro}
eyuizer
|
ie
Sy
ba 7. ms HI AC LINE
2
set TO.TUNER ASS'Y coe) : i
TO MAIN AMP
SWITCH CIRCUIT ASS Ph eee ile a Neer as ace
CAWS-
01
oes
o
TOTUNER
AS
8M
POWER
SuePiy
GRourr
ASS’Y
SPEAKER A
SPEAKER B
‘CONTROL — Ss MUTING (FM) POWER AMP ASS’Y
S4 TAPE MON 1 OFF 'AMP ASS’Y = S¢ LOW CUT (AWH-002) SPEAKER C
= te HON 2 OFF (AWG-008) Si? HIGH CUT
6 LOUDNESS OFF
| SWITCH CIRCUIT ASS’Y
Si MODE MONO | CAWS-013)
HEADPHONES
st remmp

SxX-626
5. DISASSEMBLY
1. Remove 4 screws from the sides of the
wooden case. Pull the case backward off
from the receiver housing.
2. Pull off all knobs, then remove nuts and
washers from shafts and remove 2 screws
from top of front panel. The front panel can
now be removed.
3.
The
bottom
plate
can
be
removed
after
loosening
the
7
screws.

6. PARTS AND P.C. BOARD LOCATION
FERRITE LOOPSTICK ANTENNA
ATB-015-A
6.1 TOP VIEW
KNOB (SPEAKERS, BASS, TREBLE, VOLUME, FERRITE LOOPSTICK ANTENNA
BALANCE AND SELECTOR) HOLDER ASSEMBLY
AAB-007-C AXB-001-0
FRONT PANEL ASSEMBLY
ANB-108-E ELECTROLYTIC CAPACITOR
ACH-011-A
TUNING PULLEY ASSEMBLY
ANB-093-F
TUNER ASSEMBLY: POWER TRANSFORMER
AWE-031-0
ATT-040-B
(KUW)
ATT-072-B (KCW)
ATT-041-E (FVZW, FW)
ATT-061-A (NBW)
df (2S Tela
= (Earr
D
C
KNOB (TUNING)
AAA-004-B
oe)
mall
POWER AMPLIFIER ASSEMBLY
AWH-002-E (KUW, KCW, FVZW, FW)
TUNING SHAFT ASSEMBLY AWH-013-B (NBW)
AXA-032-0
FUSE HOLDER (PROTECTION)
CR & METER DRIVE ASSEMBLY K96-007-C (KUW, KCW, FVZW, FW)
AWM-050-0
Ar

6.2 BOTTOM VIEW
VARIABLE RESISTOR 500k2-81 (VOLUME)
ACV-103-0
KNOB (PUSH BUTTONS)
AAD-023-0
ROTARY SWITCH ( SELECTOR)
ASB-036-0 ;
SWITCH CIRCUIT ASSEMBLY
AWS-014-0
ROTARY SWITCH (SPEAKERS)
ASA-026-A (KUW, KCW)
ASA-015-A (FVZW, FW, NBW)
VARIABLE RESISTOR 500kQ-HB
(BALANCE)
ACV-104-0
CONTROL AMPLIFIER ASSEMBLY
AWG-008-A
AWG-008-A
SX-626
EQUALIZER AMPLIFIER ASSEMBLY
W21-004-B
PHONO JACK (6 JACKS)
AKB-007-0
POWER SUPPLY CIRCUIT ASSEMBLY
AWR-029-A
ANTENNA TERMINAL BOARD
K11-043-D
— SWITCH CIRCUIT ASSEMBLY
AWS-013-A
FUSE HOLDER (AC POWER)
K96-007-C (KUW)
AKR-006-0 (KCW)
AKR-001-0 (FVZW, FW)
Ad