Pioneer A-X700 User manual

d) PIONEER WO5
Setvice
c/Manual
CIRCUIT DESCRIPTIONS
ORDER NO.
ARP-649-0
REPAIR & ADJUSTMENTS
STEREO AMPLIFIER
A-X700
MODEL A-X700 COMES IN FIVE VERSIONS DISTINGUSHED AS FOLLOWS:
Remarks
EE
AC120V only U.S.A. model
AC220V, 240V (switchable) European continent model
AC220V, 240V (switchable) United Kingdom model
AC110V, 120V, 220V, 240V (switchable) General export model
AC110V, 120V, 220V, 240V (switchable) U.S. Military model
© This service manual is applicable to the KU, HE, HB and S, S/G types.
For servicing of the HE, HB, S, S/G types, please refer to Pages 30~ 44.
CONTENTS
1. SPECIFICATIONS ........... 00... 000 eee 2 9. SCHEMATIC DIAGRAM ............ 4055 21
2. FRONT PANEL FACILITIES .............. 3 10. ELECTRICAL PARTS LIST ..........---> 25
3. PARTS LOCATION .............0000005 5 11. SAFETY INFORMATION...........- 6055 29
4. PACKING............00 2. eee eee 6 12. FOR HE TYPE ........ ee ees 30
5. EXPLODED VIEW AND PARTS LIST........ d 13. FORS,S/G TYPES .......-. 002 eee ev eres 37
6. BLOCK DIAGRAM ............00 000 eee 11 14, FOR CHB TYPE 2 ogi oes wien ae ea ge ees 38
7. CIRCUIT DESCRIPTIONS................ 13
8. P.C. BOARDS CONNECTION DIAGRAM ..... 17
PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153, Japar?
PIONEER ELECTRONICS [USA] INC. P.O. Sox 1760, Long Beach, California 90801 U.S.A.
TEL: (BOO} 421-1404, (B00) 237-0424
PIONEER ELECTRONIC [EUROPE] N.V. Keetbergiaan 1, 2740 Beveren, Belgium TEL: 03/775:28:08
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Austrare
TEL: [03] 580-9911
YA © DEC. 1984 Printeed in Japan

1. SPECIFICATIONS
Amplifier Section
Continuous average power output is 45
watts* per channel, min., at 8 ohms from
20 Hertz to 20,000 Hertz with no more
than 0.07% total harmonic distortion.
DIN, Continuous Power Output at 1 kHz (both chan-
nels driven)
T.H.D. 1%, 892 occ eeccece cece eees 50 W per channel
Input (Sensitivity/Impedance)
PHONO ....... ccc ceceeceee eee eeeteeee eens 2.5 mV/50 kQ
TUNER, CD, TAPE PLAY, VIDEO/AUX
ADAPTOR sss cievieds tneusoooles cxeia 150 mV/50 kQ
Phono Overload Level (T.H.D. 0.1%, 1 kHz)
Output (Level/Impedance)
TAPE REG isc tetiaiielea cies 150 mV/2.2 kQ
Frequency Response
PHONO (RIAA Equalization)
Reus oieAlenedvikln sedan etyaoe: 20 Hz to 20 kHz +0.3 dB
TUNER, CD, VIDEO/AUX, TAPE PLAY,
ADAPTOR ...........000000 20 Hz to 70 kHz +2 dB
Tone Control
BASS» sectsenhiositaetie oaateetes +10 dB (100 Hz)
TREBE Beste icevicecniioxs aoseass +10 dB (10 kHz)
MUtING 2 35 fetes Soctencs casa deca svsseccaaviebeesentnaen ~-20 dB
Loudness Control (Volume control set at —40 dB
position)
VOOH 22s fo: sce videcaseete sutacanctttoucuuaeud eatse te +7dB
VONKZ esis csustanvh les cata wasnt tctnwastes dateate cacee +4dB
Hum and Noise (IHF, short circuited, A network)
PHONO? srcstietehateteGinceeadactdebee estan: 80 dB
CD, VIDEO/AUX, ADAPTOR, TUNER,
TARE "PLAY sterol ates 97 dB
Hum and Noise (DIN, continuous power 150 mW)
PHONO ocd encdeteidasak cs casccsnteaes oats 73 dB/66 dB
CD, VIDEO/AUX, ADAPTOR, TUNER,
TAPE PLAY .....cccccccececccneeeee senses 85 dB/62 dB
Miscellaneous
Power Requirements
HE model ...........-:2c0ceeee es a.c. 220 V ~, 50/60 Hz
HB model a... see ee a.c. 240 V ~, 50/60 Hz
S, S/G models’..... ~AC 110 V/120 V/220 V/240 V
(switchable), 50/60 Hz
KU model os eee ee eee eee eeee eee AC 120 V, 60 Hz
Power Consumption
HE Model .ciidectecres avandia cits Aavadiaigaenees 310 W
HB model ce sacassecsescescaeviveacscssieavns 310 W
S, S/G models ............cccccecenenenseeeeeeeees 140 W
KUi'model! © iiveaiwsincstintuaciedehtronts 140 W
Dimensions ..........0685 320 (W) x 98 (H) x 221(D) mm
12-5/8 (W) x 3-7/8 (H) x 8-3/4 (D) in
Weight (without package) ............ 5.2 kg (11 Ib 7oz)
Furnished Parts
Operating Instructions ..............cccscceesecenseesa teens 1
NOTE:
© Specifications and design subject to possible modjfi-
cation without notice due to improvements,
e *Measured pursuant to the Federal Trade Commission ‘s
Trade Regulation rule on Power Claims for Amplifier.

2. FRONT PANEL FACILITIES
FRONT PANEL
(?
NOH,
©)
©)
@) POWER switch
Press to turn power to the unit ON and OFF.
Depressed position (ON):
Power is supplied to the unit.
Released position (OFF):
Power to the unit is disconnected.
(2) FUNCTION switches/indicators
[PHONO] — Press when listening to record playback
on a turntable.
[TUNER] — Press when listening to AM or FM broad-
casts with a tuner.
[CD] — Press when listening to a compact disc
playback with a CD player.
[VIDEO/ AUX] — Press when listening to programs
from a component connected to the VIDEO/ AUX ter-
minals.
[TAPE 1] — Press when listening to tape playback
with a tape deck.
[TAPE 2/ ADAPTOR] — Press when using a compo-
nent (sound processor, graphic equalizer) connected
to the TAPE 2/ ADAPTOR terminals. Also can be used
during tape playback when a tape deck is connected to
these terminals.
NOTE:
When a component is not connected to the TAPE 2/ADAP-
TOR terminals, or when the component connected is not be-
ing used, be sure to set the {TAPE 2/ADAPTOR) switch to
the OFF position (the indicator will go out). If set to the ON
position, No sound will be heard.
ood ®
(3) FLUORESCENT DISPLAY
[VOLUME/BALANCE] — Normally (VOLUME) in-
dicates the sound volume. The larger the numbers, the
larger the sound volume. When the BALANCE switch
is pressed, the display’s function switches to in-
dicating the right/left balance of sound (after a few
seconds, the display will automatically switch back to
its volume function).
[LOUDNESS] — Lights when the LOUDNESS switch
is set to the ON position.
[MUTING] — Lights when the MUTING switch is set
to the ON position.
@) VOLUME switches
These are used for controlling the sound volume.
[VOLUME UP] — Increases the sound volume.
[VOLUME DOWN] — Decreases the sound volume.
G) PHONES jack
When using headphones, insert their plug into this
jack. The sound from the speakers will automatically
be disconnected.
® MIC jack
When using a microphone, insert its plug into this
Jack.

@ TREBLE tone control
Use for adjusting the high-frequency tone.
The central ‘0’ position is the flat (normal) position.
When moved to the right, high-frequency tones are
emphasized; when moved to the left, high-frequency
tones are deemphasized.
BASS tone control
Use to adjust the low-frequency tone. The central
“0" position is the flat (normal) position. When mov-
ed
to
the
right,
low-frequency
tones
are
empha-
sized; when moved to the left, low-frequency
tones are deemphasized.
@) MIC MIXING control
Use to adjust the sound balance between the
microphone connected to the MIC jack, and com-
ponents (tuner, tape deck, turntable, CD player,
etc.) connected to the rear panel.
When the control is moved to the MIC side, the
sound from the microphone will be at a maximum,
while the sound from the other components will not
be heard.
When moved to the SOURCE side, the sound from
components will be at a maximum, and the micro-
phone sound will not be heard.
NOTE:
When performing playback of source components only,
leave the control set to the SOURCE side.
BALANCE switches
Normally, set so that the control display’s BALANCE
function indicates at the center position. (When L
and R are pressed simultaneously, the balance will be
adjusted to the center position.) If the sound heard
from the speakers appears to be too loud on one
side, adjust as follows: If the right side is too loud,
press L. If the left side is too loud, press R.
(1) LOUDNESS switch
Press when listening at a low volume level.
When pressed ON, the control display’s LOUDNESS
indicator will light. Very low- and very high-
frequency
sounds
will
be
augmented,
thus
giving
a
more powerful sound quality even at low listening
levels.
(2) MUTING switch
Use
to
temporarily
cut
sound
volume.
When pressed ON, the control display’s MUTING in-
dicator
will
light,
and
sound
volume
will
be
cut
by
20
dB. When set to OFF, the sound will return to its
previous volume.
When the power to the unit is turned OFF, a built-
in microcomputer automatically memorizes the
positions of the following switches, and will main-
tain that memory for approximately 1 week when
the unit is not used. As a result, when the power is
turned ON, the previously set switch positions will
be set again automatically.
e FUNCTION switches e VOLUME switch
e LOUDNESS switch eMUTING switch
e BALANCE switches
If the unit is not used for more than one week, the
memorized positions will be cancelled, and the
following positions will be set:
e VOLUME switch — Minimum
e LOUDNESS switch, MUTING switch — OFF
e BALANCE switches — Center

3. PARTS LOCATION
NOTES:
e Parts without part number cannot be supplied.
e The A mark found on some component parts indicates the importance of the
safety factor of the part. Therefore, when replacing, be sure to use parts of identical
designation.
e For your Parts Stock Control, the fast moving items are indicated with the marks
kk and x.
kk GENERALLY MOVES FASTER THAN x.
This classification shall be adjusted by each distributor because it depends on model
number, temperature, humidity, etc.
Front Panel View
Bonnet
case
Knob
CD
(CD)
ANE-512
AAY-012
Knob
(POWER)
AAD-995
Knob PH (PHONO)
AAY-010
Knob TU (TUNER)
AAY-011
Front panel assembly
Knob VR1 (VOLUME UP)
ANM-737
AAY-018
Knob (BASS, TREBLE, MIC)
AAY-040
Knob VR2 (VOLUME DOWN)
Me a = WA AAY-019
Knob S
AAD-957
Knob VA (VIDEO/AUX)
AAY-013
Knob
T2
(TAPE
2/ADAPTOR)
Knob
T1
(TAPE
1)
AAY-015
AAY-014
Front View with Panel Removed
A\ Push switch (POWER)
ASG-551
Phone jack (PHONES)
AKN-049
“s)
Jack
(MIC)
e
AKN-052 | ‘ts
* Volume (TREBLE, BASS)
ACX-129
* LED (PHONO, TUNER, CD
VIDEO/AUX, TAPE 1)
AEL-370
* Fluorescent indicator tube
AAV -030
kk Tact switch (VOLUME, UP,
DOWN MUTING)
ASG-704
*
Volume
(MIC
MIXING)
%*&
LED
(TAPE
2/ADAPTOR)
ACX-130
AEL-437
Rear Panel View
kk Slide switch (W/S)
ASH-031
AKN-202
/\
AC
socket
AKP-504
Jack (PL, TU, CD, TAPE 1) |
Terminal (PL, TU, CD)
AKB-095
Terminal (REC, PB)
A AC power cord
AKB-094
ADG-088
Terminal (TAPE 2/ADAPTOR
VIDEO IN) Terminal (SPEAKERS)
AKB-095 AKE-104
Top View
Control assembly B
GWG-193
Control assembly A
GWG-190
AF assembly
GWK-249
4. PACKING
Mark No. Part No.
1
2
3
4
5
ARB-647
AHG-117
ARH-070
AHA-324
AHA-325
AHG-125
AHE-478
AHG-128
AHB-131
omon o
/\® Power transformer
ATS-176
Description
Operating instructions
Vinyl pouch
Sub instruction manual
Front pad
Rear pad
Sheet
Packing case assembly
Sheet
Pad

5. EXPLODED VIEWS AND PARTS LIST
|} —Heat sink, See Page 10

e Parts without part number cannot be supplied. Heat Sink
e The /\ mark found on some component parts indicates the importance of the
safety factor of the part. Therefore, when replacing, be sure to use parts of identical
designation.
e For your Parts Stock Control, the fast moving items are indicated with the marks
kk and *.
wk GENERALLY MOVES FASTER THAN *.
This classification shall be adjusted by each distributor because it depends on model
number, temperature, humidity, etc.
Mark No. Part No. Description Mark No. Part No. Description
1 GWK-249 AF assembly 100 Jack assembly (MIC)
2 GWY-156 Driver assembly 101 Mini Jack assembly
3 GWG-190 Control assembly A 102 Terminal (GND)
4 GWG-193 Control assembly B 103 Chassis
5 ANE-512 Bonnet case 104 Panel stay
6 ANM-737 Front panel assembly 105 Bottom plate
7 AAY-018 Push knob VR1(VOLUME UP) 106 Rear panel
8 AAY-019 Push knob VR2(VOLUME DOWN) 107 Print spacer
9 AAY-010 Push knob PH (PHONO) 108 PCB holder
10 AAY-011 Push knob TU (TUNER) 109 Mount plate
11. AAY-012 Push knob CD (CD) 110 Blind sheet
12 AAY-013 Push knob VA (VIDEO/AUX) 111 PCB holder A
13. AAY-014 Push knob T1 (TAPE 1) 112 PCB holder B
14 AAY-015 Push knob T2 (TAPE 2) 113 Headphone assembly
15 AAD-957 Push knob S
16 AAD-995 Power knob (POWER)
17. AAY-040 Slide knob
A 18 ADG.088 AC Power cord Mark __No. Part No. Description
A
*®&
19
ATS-176
Power
transformer
(120V)
1
ABA-258
Screw
20 2 AEC-942 Mica sheet
&k& 3° 2SA1216(A)-G/P/Y* Q2, Q4, Power transistor
A
21
AKP-504
AC
socket
*&k&
4
28C2922(A)-G/P/Y*
Q1,
Q3,
Power
transistor
A\ ke 22 AEK-125 Fuse (FU1) 5 BBZ30P080FZK Screw
A\ *®* 23° ASG-551 Push switch ($1)
24 AEP-016 Leg assembly 50 Heat sink
25 AEC-471 Rivet 51 Sub heat sink B
52 Sub heat sink A
26 AEC-510 Rivet
27 BBZ30PO80FMC Screw (3x8) *hfe of Q1—O4 should have the same value.
28 VBZ30PO80FZK Screw (3x8)
29 PMZ20PO30FZK Screw (2x3)
30 VMZ30PO60FMC Screw (3x6)
10

6. BLOCK DIAGRAM
POWER AMP
22.6dB
CAT IKH)
+44v 10201 PAOOI6
+15V -
(Kk) 0507 —=—| +44y 444
1C1l02
TC9I62N
Buffer
6aB +}
ne
ICIO!_
TC9I77P
1SOmV_VIDEO/AUX
rREc
TAPE2
isomv lpLay
ae
an
oS
es Y
ae a
5 :
PREC
TAPE |
isomv lpLay
XO)
OFAC
Es
isomv coG
15OmV TUNER
2.5mV PHONO
es
From RCH
hi?
hwo
From RCH
From RCH
en Ha eae)
DATA (16 8S
FL display
7 (K) Q504
i)
+26V
FL Driver
MIC_AMP
1C60!
)
<) =— 48508 —~
sey = |
[aon] fq (
O
TUNER lvx-2
O
AUTO .
revere! [eo] fest
O
DISPLAY
Power Supply
PHONO
TUNER
co
VIDEO/AUX
P06027
FUL SI
BAL LEFT
BAL RIGHT
LOUDNEES
MUTING
w/S(W-S)
AC 120V
60Hz
SWITCHED UNSWITCHED
Q402 {
aw, A) 3
11

7. CIRCUIT DESCRIPTIONS
Function Switching
If one of the switches S501 thru S506 in
Fig. 7.6 is pressed, the PD6027 microcomputer
(IC401) detects which switch has been pressed, and
by controlling the TC9162N electronic switch
(IC102), switches the unit to the selected function.
H
a
pi tt
Fig. 7-1
Key scanning is started only when one of the
keys in the matrix is pressed. PO thru P3 are all at
L level before any key is pressed, but are switched
to H level once a key is pressed. At the same time,
a microcomputer reads which key has been pressed
at KO thru K3, and then decides whether the pres-.
sed key is a function key or a volume key. If a
function key, the current function position is com-
pared with the pressed function. If this comparison
shows that the two are different functions, func-
tion data corresponding to the pressed key is pas-
sed to the TC9162N. The configuration of this
data is outlined in Fig. 7.2.
Switch
scare re ae a ew) a ce
Bit 8 is
ck not used
' 2 3 4 5 6 7 8 9 10 " 12 13 14
=
st The switch is activated at ‘this rising edge
Fig. 7-2
cr | ce | cs
The data consists of 14 bits with bits 1 thru 7
corresponding to PHONO, TUNER, CD, etc., and
the bit for the switch to be switched on is switched
to H level. Bits 9 and 10 are the left and right
channel selector bits, while bits 11 thru 14 are
TC9162N code bits.
Volume Control
Volume control operations involve the use of a
microcomputer (IC401) combined with the
TC9177P electronic volume control (IC101) as
indicated in Fig. 7.7.
Selector 2dB step
it attenuator
1008 step
attenuator
Chip select bit
Loudness
ON/OFF
Fig. 7-3
20-Bit serial data corresponding to the pressed
key and the current volume level is passed from the
microcomputer for both left and right channels in
that order. TC9177P (IC101) stores the 20 bits of
data in a 20-bit shift register, and then activates
each switch by strobe signal to achieve the selected
degree of attenuation.
If bit 3 of the data is switched to H level, LS-1 is
switched on and LS-2 is switched off resulting in
the loudness being switched on to achieve a loud-
ness effect if the volume level is less than -20dB.
Muting
TC9177P (IC101) attenuation is changed by
20dB by data similar to the VR control data.
Volume UP & DOWN Switches
Pressing
the
UP
(S507)
or
DOWN
(S508)
switch
continuously
results
in
continuous
volume
changes.
The
DOWN
switch,
however,
is
set
to
change
the
volume
at
a faster
rate.
The
volume
level
can
be
controlled
in
2dB
steps
from
OdB
to
76dB,
and
down
to
—
infinity
in
40
steps.
"1 Volume indicator attenuation
Lighting points
-~% we OO Vow Oo
aed -70 -60 -50 -40 -30 -20 -10
Attenuation
° [dB]
Fig. 7-4
L and R Balance Switches
Pressing the L (S509) or R (S510) balance switch
once results in the display being switched to a
balance display. Pressing either switch continuous-
ly results in continuous switching operation, and
pressing both together results in the balance being
set to center.
13
Attenuation (dB)
Balance display attenuation
aan’) 1210 8 6 42 0 2 46 B 10 12 14
Fig. 7-5
Lighting points
0808 oOS07
5
os03
0$02 0804 D506
ixe
ike
ot
Forerion J =a
fee) goer
| rome °
E
°
$301
Display
unit
$501 | PHONO
$302 : TUNER
$503 co
$804 viDEO/auX
S505: TAPE
S506. ADAPTOR /TAPE 2
$510; BAL RIGHT
SS(3° METER RANGE (150 -10W}
S301; w/s (W-8)
Level shift
Level shift
POWER AMP
$807: vou UP
$508: VOL DOWN
$512 | Muting switch
S511. LOvONESS.
Fig. 7-7
Display
——» Output

Automatic Function Switching
If audio components featuring “‘one-touch auto-
play”? functions are connected to the relevant
PHONO (PL), TUNER (TX), CD, or TAPE1(CT)
“AUTO FUNCTION” terminal on the rear panel
of the A—X700, the function is switched auto-
matically to the operated component.
When the PLAY or STATION CALL switch of
the component connected to the PHONO, TUNER,
CD, or TAPE1 terminal is switched on, the generat-
ed L level signal is passed to the microcomputer
which in turn passes corresponding data to the
function switch (TC9162N) to effect the actual
switching operation.
Stop Signal
When a function is switched by automatic func-
tion switching or amplifier function switching, an
H level signal is generated at pin 30 of the micro-
computer. Q301 is thus turned on, and auto stop
output signals are passed to PL, CD, and CT.
Double Deck and Single Deck Switching
S301 is switched according to whether the tape
deck connected to TAPE1 is a double or single
deck. When a double deck is used, S301 is switched
on resulting in pin 25 of the microcomputer re-
maining at H level. Q404 is thus turned on, and
Q406 then Q102 are turned off. When Q101 and
Q102 are both turned off, REC1 is switched on.
When S301 is off, pin 25 of the microcomputer
is switched to H or L level depending on whether
or not function has been switched to TAPE1. If
the function has been switched to TAPE1, pin 25
is switched to L level, resulting in Q101 and Q102
being turned on and REC1 being switched off.
When the function is switched to other positions,
the reverse occurs.
Remote Control Terminal
The photosensitive section of the remote control
mechanism is located in the tuner. Upon reception
of a remote control signal in the tuner, a VR UP,
DOWN, muting, VIDEO/AUX, or tuntable start/
stop signal is decoded by the microcomputer. Re-
mote control signals for CD or TAPE] are passed
direct from the tuner.
Microcomputer Reset Circuit
+17V(B2)
Q4ot
c401
+5.6V(B1) [
S76 V(B R405
Fig. 7-8
ie = Se B2 voltage
§.5-—-——-—- 7 Q401 collector
7.4
B1 voltage
eee Q403 base
; =r. — 0403 collector
Fig. 7-8-1
The microcomputer reset circuit is outlined in
Fig. 7.7.
When the power is switched on, and the Q401
base voltage (B,) is increased to 5.6V with the
emitter voltage (B,) in excess of 7.4V, Q401 is
turned on and the collector voltage is gradually in-
creased to 15.5V. The Q401 output is differentiat-
ed by C401/R405 and then inverted by Q403 to
obtain the reset signal.
D425 has been inserted in the circuit to prevent
Q408 cut-off at the same time the power is switch-
ed off in order to prevent the memory from being
switched off by reset circuit misoperation if the
power switch is switched on and off in quick suc-
cession. The reset signal resets the microcomputer
once clock oscillation (3.84 MHz) has been com-
menced when the STANDBY pin (No.37) voltage
is increased after the power is switched on.
15
PD6027 Functions
X
Ene eS 3.84 MHz resonator is connected
} 2] x | between these pins.
3 | RESET] Positive power supply (VOD) connection
Remote control signal input
Serial data output to PD0012, TC9177P,
and TC9162N.
SC/Arg NC
l=[=[=[ele]e[e]
Output of key matrix
drive signals
TAPE 1
| n
Indicator outputs
m) ow] mle coy“
<
elelele] [=] =] =| =|
Strobe outputs
25°| Ri
TAPE 1
110W meter range
Back-up mode starter input
Auto function input
b be] Oo NTH
w Oo
*
Indicator
outputs
EEEEEGG
37
Key inputs
< ” u ne
:
Nefelefe}e] =]e]
Vv
ies)
*Pin No. 25.
The R12 pin is at H level. Pin 25 is switched to
L level when TAPE1 function is selected, but is
switched to H level in other function positions, and
R12 remains at H level.
*Pin No. 30
Switched to H level for 100msec immediately
following function switching.
16

A-X700 4
2
8.
P.C.
BOARDS
CONNECTION
DIAGRAM
17
Ic601
10202
a»haA—IL (B) Ass’y
Gwe -193
Q501
1201 9502
9504 ©9503
1c 502
C501 1C503 1c504
vR2ol
VR203
VR202
Q501
Q502
Q503
Q504
1C201, 202, 601
1C501
1c 502
1C 503, 504
D501
0502
d701
D508
vR20!
VR202, 203
VRBO! , 802
S50I~ 511,513
: 280438
2SAIS.
+ RNI203
RN2203,
NJM4558DXC
TO62504P
: PDOO!2
: M54562P
' KZLO6I
» AEL-404
0503 ~ 507, 702:
: RDISEB
AEL - 370
188131
ACX -130
ACX- 129
VRTB6EVS222
ASG-704
VAD yDAss'y
Q!0!1, 102 ; 28C2878
Q40: 2SA933S
Q402 ' RN2203
403,405 2SC 1740S
Q404,406 | RN1203
1c 101 : TCOITTR
1C401 : PD6027
D401 : AEL-437
0403, 404, 406~ 426
US 1035
0405 KZLO83
Q501, 502
@503~ 506
@507, 508
050! ~ 506°
ic102z
C101 9404
9204 Ic 202
Q403 Q401 Q402
AF ASSEMBLY
Q302
Q202
Q30!
Q201
GWK-249
ADAPTOR
/ TAPE 2
DRIVER ASSEMBLY
GWY/-156
2SA979
2SC 1845
2SA1145
USI035
cD TAPE 3 REMOCON
Q30! : 28C1740S
0301~305 | USIO35
$301 ASH - O31

4 Q302
ic 202 Q301
402 Q202 Q201 ic201 203
Q305
Q303 Q304
mim
SPEAKERS Q201A, 202A 28C2238
(28C2275A)
Q203A,204A 2SA968
ADAPTOR
_
(28A985A)
Q301, 302 . 28C2705
303, 304 28C1740S
(28C2603)
Q305 2SD4381A)
0401, 403 28D836A
0402 2SB750A
0404 280438
IC 101 NJM20430D
1102 TC9I6G2N
16201, 202 PAOOI6
D201~204 : KZLOS6
0207~ 210, : RD27EB
D301 ~ 304, 306,307 : 1S1554
D305 SKZLIGO
faa | | D401 + RB6OZ
. Hl | 0402,403 : $5566
| ' | 0404 | RD22E8
> | i | 0406, 407 RDIGEB
+ | 0409 RO27EB
| D410,411 > $5566
5 {
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T “Y Bs * i ADG - 088
1 4 4 SWITCHED 4 3P AC SOCKET
A BehiEES FRANSPORMER: (OOW MAX ~~" UNSWITCHED
At
i 10
ATS-i79 ponents
10 11
External Appearance of Transistors and ICs
2SA985A NJM4558D XC
2SC2275A TC9177P NJM2043DD
Type
No
5
hre~ 4 i
2SC2922(A)G/P/Y 2SA968-0/Y 2SC2705
2SA1216(A)G/P/Y 2SB750A 2SA1145
Lot No 2SC2238-0/Y 2SC2878
2SD836A
Type No
E
c
8
2SC 1740S 2SC1845 2SD438 2SA979
2SA933S
ot No
Type No:
Type No
Type No Lot No hee
Lot No Type No Lot No
hre
nre
BI
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12
RN1203
RN2203
Type No
Lot No
Lot No
2SA1115
2SC2603
Lot No
PA0016
PD6027
2SD438(A)-F
Lot No
Type No
here
11
12

9. SCHEMATIC DIAGRAM
CONTROL(A)
ASSEMBLY
GwG
-
190
CONTROL
(B)
ASSEMBLY
Gwe
-
193
Q101,
a102
1C1Or
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re
106-5
a
“a
=
7
= =
1c 20
MIC
JACK
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=
REC
MUTING
ELECTRIC
VOLUME
106
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5
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RESISTORS:
Indicated in 1. 1/4W. 1/6W and 1/8W, +5% tolerance unless otherwise
we
6.
noted
k;
kM,
M:
MN.
(F);
1%,
(G),
£2%y
(K);
+10%,
(M);
+20%
tolerance
we
CAPACITORS.
2-1
[-15W3
Indicated
in
capacity
(uF)/voltage
(V)
unless
otherwise
noted
p:
pF.
wie-2
t+isva
Indication
without
voltage
1s
SOV
except
electrolytic
capacitor.
iit
then
Power
IN
agai
VOLTAGE, CURRENT.
JW
2
(GNO}
fe
ON
a
VJ]:
Signal
voltage
at
80
W
+
80
W,
8M
output
(1
kHz)
JIN=3
Cobh
POWER
IN?
“17:
OC
voltage
(Vv)
at
ho-
input
signal
Value
in
(:
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18
DC
volta
JN3-6
_(ST-610
|
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rated
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route
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point
JN3-5_CFL,AC]
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j
The
A\
mark
tound
on
some
component
paris
indicates
the
mportance
of
JU3-4
CFL
ACI
oh
A
ry
Soar
DUTLET.
the
ty
factor
of
the
part.
Therefore.
when
replacing.
be
sure
to
use
ee
erent
i '
SWITCHED
KP
504
parts
of
identical
designation
1OOw
MAX.
UNSWITCHED
‘SEMI
CONDUCTORS
BEATER
TRANSFORMER.
b~-------4
1OOW
MAK
3X
marked
capacitors
and
resistors
have
parts
unmbers.
Kc
101
NJM204300
@
501,502
2SA979
D
402,403
sss66
The
underlined
indicates
the
switch
position.
woz
Tc9162N
503~506
2SC1845
404
RO22EB
201,202
PRODI.
507,508
2SAI145
notes
This
1s
the
basic
schematic
diagram,
but
the
actual
circuit
may
vary
due
to
OGG
improvements
in
design.
1
@
2,202
2sc2238
D
201~204
KZLO86
Bri
eee
¥
$5566
5.
SWITCHES
$613
MUTING
301,302
2SC2705
207~210 RO2.7EB
50I~506
USI035
$501
PHONO
S001
VOESUE
7$
(WS)
301~
304
1S1554
sbi:
TUNER
$608
VOL
DOWN
$301
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(We
307
15154
8
Boles
$603
CD
$609
BAL
LEFT
ao
R602
$604
VIDEO
“AUX
$510
BAL
RIGHT
$605
TAPE!
$611
LOUDNESS
THE
UNDERLINED
INDICATES
THE
SWITCH
POSITION
—————
—
sSeSS
$506 ADAPTOR

10. ELECTRICAL PARTS LIST
NOTES:
e When ordering resistors, first convert resistance values into code form as shown in
the following examples.
Ex.1 When there are 2 effective digits (any digit apart from 0), such as 560 ohm
and 47k ohm (tolerance is shown by J = 5%, and K = 10%).
RD¥PS HOM
RD*PS ANB
RN2H ORIEK
RSIPOMOK
Ex. 2 When there are 3 effective digits (such as in high precision metal film resis-
5602 56x 10}
47kQ2 47x 10°
0.52 ORS +2 oes as
12 OLDS 2 ee
tors).
5.62kRQ2 562 x 10)
RN*%SR BEA F
e The 4, mark found on some component parts indicates the importance of the
safety factor of the part. Therefore, when replacing, be sure to use parts of identical
designation.
e For your Parts Stock Control, the fast moving items are indicated with the marks
kk and *.
wx GENERALLY MOVES FASTER THAN x.
This classification shall be adjusted by each distributor because it depends on model
number , temperature, humidity, etc.
P.C.B. ASSEMBLIES
Mark Symbol & Description
AF Assembly
Driver Assembly
Control Assembly A
Contro! Assembly B
Microphone Jack Assembly
Mini-jack Assembly
Headphones Assembly
SEMICONDUCTORS
Mark Symbol & Description
A. *k 1,03
A we Q2,04
Part No.
GWK-249
GWY-156
GWG-190
GWG-193
Part No.
2SC2922(A)-G/P/Y *
2SA1216(A)-G/P/Y*
*hfe of Q1—Q4 should have the same value.
OTHERS
Mark Symbol & Description
faa C2 Ceramic Capacitor
A * Power Transformer
A AC socket
tek Push Switch
A\ tee FUT Fuse (4A)
A AC power cord
Mica Sheet
25
Part No.
CKDYF473Z 50
ATS-176
AKP-504
ASG-551
AEK-125
ADG-088
AEC-942
AF Assembly (GWK-249)
SEMICONDUCTORS
Mark Symbol & Description
wk 10101
kk 10201, 1C202
kkk 10102
wk =0203, A204
xk =©0402
kk 0303, 0304
kk =0201, 0202
kk 0301, 0302
wk =0305
wk =0404
kkk 0401, 0403
* D201 — D204
* D305
* D401
* D406, D407
* 0408
* 0207 — D210
* 0404
* D409
* D402, D403, D410, D411
* D301—D304, D306, D307
Part No.
NJM2043DD
PAO0016
TC9162N
2SA968—0/Y *
(2SA985(A)
2SB750A
2SC1740S
(2SC2603)
2S8C2238—0/Y *
(2SC2275A)
28C2705
2$D438(A)—F
2SD438
2SD836A
KZLO56
KZL140
RB602
RD16EB
(HZ16EB)
RD18EB
(HZ18EB)
RD2.7EB
(HZ2.7EB)
RD22EB
(HZ22EB)
RD27EB
(HZ227EB)
$5566
(11E2)
181554
*hfe of Q201—Q204 should have the same value.
COILS & TRANSFORMER
Mark Symbol & Description Part No.
L301, L302 (1uH) ATH-053
‘A,
*®
7401
(Heater
transformer)
ATS-141
RELAY
Mark Symbol & Description Part No.
RY301 ASR-107
(ASR-109}
CAPACITORS
Mark Symbol & Description Part No.
C401, C402 (5600/50V) ACH-244
C203, C204, C219 — C222
C207 — C210
C103, C104, C215, C216
C211 — C214
C301, C302
C309
C223, C224
C403, C404, C201, C202
C113, C114, C405, C406
C105, C106
C308
C416
C111,C112
C409 — C411, C414
C412
C307
C101, C102
C205, C206
C407, C408, C413
C415
C217, C218
C303 — C306
C107, C108
C109, C110
C115
RESISTORS
CCDSL 101J 50
CCDSL 101K 500
CCDSL 151J 50
CCDSL 680J 50
CEANP 2R2M 50
CEAR 47M 100L
CEAS 221M 35
CEA 100M S50L
CEA 101M 10L
CEA 101M 25L
CEA 101M 50L
CEA 2R2M S0L
CEA 470M 25L
CEA 470M 50L
CEA 471M 6L
CEXA 2R2M 50
CEXA 101M 25
CKDYB 222K 50
CKDYF 4732 50
CMAO20D 500
CQMA 104K 50
CQMA 222J 50
CQMA822J 50
CKDYF 1032 50
Note: When ordering resistors, convert the resistance value
into code form, and then rewrite the part no. as before.
Mark Symbol & Description Part No.
: R243 — R246 (0.22 2 2W) ACN-131
A R404, R406 RD1/4PMFL 1004
ray R408 RD1/4PMFL4R75
AN R311, R312, R410 RFA1/4PS1005
A R310 RFA1/4PS101J
A R239 — R242 REA1/4PS221J
fy R235 — R238, R403 RFA1/4PS4R7J
R317, R318 RS1PMF151J
26
Mark Symbol & Description Part No.
R315, R316
R313, R314
R401
R205 — R212, R317, R218,
R227 — R234, R305, R306
RS1PMF181J
RS1PMF182J
RS1PMF682J
RD1/4PM ooOoJ
Resistors other than above. RD1/8PM J
OTHERS
Mark Symbol & Description Part No.
Terminal 4P (REC. PB) AKB-094
Terminal 6P AKB-095
Terminal 4P (SPEAKERS) AKE-104
Transistor Socket AKH-017
Screw PBZ30PO60FMC
Headphone Assembly
Mark Symbol & Description Part No.
Headphone Jack AKN-049
Driver Assembly (GWY-156)
SEMICONDUCTORS
Mark Symbol & Description Part No.
wk =0507, 0508 2S8A1145
wk =0501, 0502 2SA979
wk 0503 — 0506 28C1845
* D501 — D506 US1035
CAPACITORS
Mark Symbol & Description Part No.
C503, C504
C505, C506
RESISTORS
CMA 101J/ 500
CQMA 222J 50
Note: When ordering resistors, convert the resistance value
into code form, and then rewrite the part no. as before.
Mark Symbol & Description
Part No.
R519, R520
R511, R512
R513, R514
Resistors other than above.
RD1/4PMFL 272J
RFA1/4PS 27143
RFA1/4PS 8203
RD1/8PM ooo
OTHERS
Mark Symbol! & Description Part No.
9P Socket AKP-046

Control Assembly (GWG-190)
SEMICONDUCTORS
Mark Symbol & Description Part No.
kk 610401 PD6027
kk 10101 TC9177P
kk §=0404, 0406, 0403 RN1203
kk ©0402 RN2203
kk 60401 2SA933S
wk 0405 2SC1740S
wk =©0101, Q102 2SC2878
* D401 AEL-437
* D405 KZLO83
* D403, D404, D406 — 0426 US1035
(181555)
CAPACITORS
Mark Symbol & Description Part No.
C403 ACH-902
C404, C405 CCDCH 270J 50
C105, C106 CCDSL 151J 50
C406 CEAR 22M 50L
C401 CEAR 22M 50L
C107 — C110, C113, C114
C402
C111, C112
C408
C101, C102
C103, C104
C404, C419
C115
RESISTORS
CEA 100M SOL
CEA 3R3M 50L
CEA 4R7M 50L
CEA 470M 10L
CKDYF 4732 50
COMA 333K 50
CCDSL 221J 50
CKDYB 471K 50
Note: When ordering resistors, convert the resistance value
into code form, and then rewrite the part no. as before.
Mark Symbol & Description
Part No.
All resistors
RD1/8PM J
OTHERS
Mark Symbol! & Description Part No.
X401 (Resonator) ASS-034
Control Assembly B (GWG-193)
SEMICONDUCTORS
Mark Symbol & Description Part No.
wk 10503, 1C504 M54562P
kkk = 1C201, 1C202, 1C601 NJM4558DXC
kkk 10502 PD0012
wk 1C501 TD62504P
wk 0503 RN1203
27
Mark Symbol & Description Part No.
kk 0504 RN2203
kk 60502 2SA1115
kk 0501 2SD438
* D503 — D507 AEL-370
* D502 AEL-404
D508 18S131
* D501 KZLO61
SWITCHES
Mark Symbol & Description Part No.
kk $501 — $511, $513 (Tact switch) ASG-704
CAPACITORS
Mark Symbol & Description Part No.
C209, C210
C201, C202
C601
C604
C603
C607
C203, C204
C218, C605
C501
C205, C206
C215, C216
C213, C214
C602
C207, C208
C211, C212
C217
RESISTORS
Note: When ordering resistors, convert the resistance value
into code form, and then rewrite the part no. as before.
CCDSL 270J 50
CCDSL 680/J 50
CEJANL OR1M 50
CEJANL 2R2M 50
CEJANL 4R7M 50
CEAO10M 50L
CEA 100M 50L
CKDYF103Z50
CKDY X473M25
COMA122K50
COMA154K50
CQMA223K50
CQMA393K50
CQMA562K50
CEA2R2M50L
CEA100MS50L
Mini-jack Assembly
SEMI-CONDUCTORS
Mark Symbol & Description Part No.
* VR202, VR203 (BASS, TREBLE) ACX-129
* VR201 (MIC-MIXING) ACX-130
R507 RD1/2PM681J
R502 RFA1/4PS4R7J
Resistors other than above.
RD1/8PM ooOoJ
OTHERS
Mark Symbol & Description Part No.
% V501(Fluorescent tube) AAV-030
Microphone Jack Assembly
Mark Symbol & Description Part No.
Microphone Jack AKN-052
Mark Symbol & Description Part No.
wk =0301 2S8C1740S
* D301 — D305 US1035
SWITCH
Mark Symbol & Description Part No.
kk $301 Slide switch (W-S) ASH-031
RESISTORS
Mark Symbol & Description Part No.
R301 — R305 RD1/8 PM101J
OTHERS
Mark Symbol & Description Part No.
Mini-jack AKN-202
28

11. SAFETY INFORMATION
1. SAFETY PRECAUTIONS
The following check should be performed for the
continued protection of the customer and service tech-
nician.
LEAKAGE CURRENT CHECK
Measure leakage current to a known earth ground
(water pipe, conduit, etc.) by connecting a leakage current
tester such as Simpson Model 229-2 or equivalent between
the earth ground and all exposed metal parts of the appli-
ance (input/output terminals, screwheads, metal overlays,
control shaft, etc.). Plug the AC line cord of the appliance
directly into a 120V AC 60Hz outlet and turn the AC
power switch on. Any current measured must not exceed
0.5mA.
ae
ie}
Leakage
current
tester
Reading should
not be above
0.5mA
Test all
exposed metal
surfaces
2-wire cord
O Also test with }
plug reversed Earth
(Using AC adapter "ground
plug as required)
AC Leakage Test
ANY MEASUREMENTS NOT WITHIN THE LIMITS
OUTLINED ABOVE ARE INDICATIVE OF A PO-
TENTIAL SHOCK HAZARD AND MUST BE COR-
RECTED BEFORE RETURNING THE APPLIANCE
TO THE CUSTOMER.
2. PRODUCT SAFETY NOTICE
Many electrical and mechanical parts in the appliance
have special safety related characteristics. These are often
not evident from visual inspection nor the protection
afforded by them necessarily can be obtained by using
replacement components rated for voltage, wattage, etc.
Replacement parts which have these special safety charac-
teristics are identified in this Service Manual.
Electrical components having such features are identified
by marking with a“ on the schematics and on the parts
list in this Service Manual.
The use of a substitute replacement component which
dose not have the same safety characteristics as the
PIONEER recommended replacement one, shown in the
parts list in this Service Manual, may create shock, fire,
or other hazards.
Product Safety is continuously under review and new
instructions are issued from time to time. For the latest
information, always consult the current PIONEER Service
Manual. A subscription to, or additional copies of, PPONEER
Service Manual may be obtained at a nominal charge from
PIONEER.
29
12. FOR HE TYPE
The HE type is the same as the KU type with the exception of the following section.
Contrast of Miscellaneous Parts
Symbol & Description
Part No.
KU type
HE type
Remarks
AF assembly
Driver assembly
Power transformer (120V)
(220 V}
AC Socket
Push switch (POWER)
(4A)
(T2.5A)
(T1.25A)
Power cord
Operating instructions
(English)
(English/French/German/Italian)
Sub instructions
Packing case
AF assembly (GWK-251)
The
AF
assembly
(GWK-251)
is
same
as
the
GWK-249
with
the
exception
of
the
following
sections.
Mark Symbol & Description
D201 — D204
D404
D413 — D415
C225, C226
C302
C403, C404
C412
R247
R248
R249, R250
R313, R314
R319
R323, R324
R408
R404, R406
R410
R412
T401 Heater transformer
Driver assembly (GWY-194)
The driver assembly (GWY-194) is the same as the GWY-156 with the exception of the following sec-
tions.
Symbol & Description
GWK-249
GWY-156
ATS-176
AKP-504
ASG-551
(ASG-549)
AEK-125
ADG-088
ARB-647
ARH-070
AHE-478
GWK-251
GWY-194
ATS-178
AKP-502
ASG-552
AEK-018
AEK-403
ADG-068
ARE-122
ARH-O71
AHE-479
Part No.
GWK-249 GWK-251
KZLO56 | ....aeee
RD22EB RD18EB
sca de eee ds 18$131
et he CQMA472K50
CEANP2R2M50 ACH-383
CEA100M50L ACH-390
CEA470M50L ACH-385
bth ge ee RD1/4PM102J
edb aah eae RD1/8PM102J
ed athe ead RD1/8PM220J
RS1PMF182J RS2LMF122J
RD1/8PM124J RD1/8PM104J
eden ee 2a oS RD1/8PM101J
RD1/4PMFL4R7J RFA1/4PS4R75
RD1/4PMFL270J RD1/4PMFL100J
RFA1/4PS100J RD1/4PM471J
RD1/8PM220J) | 3 ........
ATS-141 ATS-180
Part No.
GWY-156
| GWY-194
Remarks
R507 — R510
R519, R520
R511, R512
R513, R514
RD1/8PM153J
RFA1/4PS271J
RFA1/4PS820J
RD1/8PM223J
RD1/4PMFL272J | RS2LMF682J
RD1/4PM391J
RD1/4PM820J
Q501, 502 ¢
Q503~ 506 °
Q507, 508
D501 ~ 506 :
2SA979
28C 1845
2541145
USIO35

1
P.C. Board Pattern
Ic102
Iclol
Q404
Q302
Q204 IC 202
Q402
Q301
Q403
Q40!
Q202
Q20!
1c20)
Q203
Q305
AF ASSEMBLY
Q303
GWK-251
Q304
marks
Q201A, 202A :
ADAPTOR
/TAPE 2
Q203A,204A
AEK-O18
Lihat Q301, 302
Q303, 304
9305
0401, 403
402
0404
'C 101
1c102
1c201, 202
D207~ 210,
D301 ~ 304, 306,307 |
D305
0401
0402 ,403
0404
0406 ,407
0409
D410,411
D413~415
g sections.
marks
DRIVER ASSEMBLY
GWY -194
Q50!1, 502 : 2SA979
Q503~ 506 : 2SC 1845
Q507, 508 2SAII45
050! ~ 506 : USIO35
lowing sec-
marks
30
: TC9IG2N
: PAOOIG :
: RD27EB
1 KZLI4O0
+ RB602
! S5566
: ROIZ EB
: RDIGEB
: RD27EB
.S5566
TISSI3t
2S8C 2238
(2SC2275A)
1 2SA968
(2SA985A)
. 28c2705
2sci740s
(2SC2603)
280438 (A)
1 2SD836A
2SB750A
1280438
NJM2043DD
1S1554
32

Cp 4eeV4 «| =
Schematic Diagram
CONTROL(A) ASSEMBLY GwG - 190 CONTROL (B) ASSEMBLY Gwe - 193
101,
@
102
1c
101
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SEM! CONDUCTORS.
1C101 TC9177P Q101,102 2S8c2878 0 301~ 305 | USIO35
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sso] soz} ss03] $508 401.601 405 406 ~ 426)
ot sts, stsy sts} 34s. 1c 401 PD6027 D401 AEL- 437 | 24
| Paros-6. re Ic Sot TD6Z2504P 940! —-2SA933S «0405 KZL0B3 |
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S30! VR202,203 ACK-129
ASH-O31 WRBO!.802 VRTBEVS222
S50! 513 ASG. 704
i}
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MINI JACK ASSEMBLY 3
33

AF ASSEMBLY GWK-251
IC 201, °C 202 GNG4, 020.0204 R33 93010302 9303,0304 9305 =
NSA IC POWER AMP Nantel OVERLOARD DETECTOR OC VOLTAGE DETECTOR RELY ORIVE HEADPHONE
.
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Pay | 02,04 2SA1216 -G/P/Y Line voltage selection (FOR HE TYPE)
Ren F-sws H el Qa rao :
uO ~o4 | EKG) pane 4 Line vottage can be changed with following steps.
couz | to el A bg i 1, Dascomment the AC power cord.
a Bai nm Sroas The, 2. Remove the top cover.
3]
R-sw2
2:
COM!
art]
‘car:
10/50
A,
Roeez
0905:
3.
Change
the
connection
wire
(To
Powertransformer)
I re 4 os es of Terminal No. 3 (ORANGE) as follows
=
cae
(eel
a
a
=
2 R-Swi cus + c4i4 Re A
Puen +- Loo iol ares | Seer F598
APE ono L 7 + Voltage | Terminal No. 3
| 8s Oe > owe Sts 40s
ees | alate his 220V Orange wire |
3 : 3
|
i
0409
TSS
‘0407
aos
240v
Orange
wire
|
es Foo
cas
+ ober | ares
sped vs 4, Stick the line voltage tavei on the rear panel
gs oe Part No Description
fa “ i 40 AAX-193 220V lavei
in
26]
noe
tT
;
AAX-192
240V
lavel
(ara) |
en RECA ;! oa fy
(Ren FUN,OUT
(Len FUNC,OUT? \ =
Tuer REC!
{Nor 1. RESISTORS.
a; a 2 Indicated in M. 1/4W. 1/6W and 1/8W. +5% tolerance unless otherwise
| “Lr power rawsroRMeR | fur ace oes noted k kM. M: MN. (F}: +1%, (G); £2% (K}: +10%. (Mj: +20% tolerance
k t1sw ATs 178 A 2. CAPACITORS:
ia ee a as a iis A syromen Indicated in capacity (uFi/voltage {V) unless otherwise noted p; pF
(Leh POWER IN} 9 2aov 5 (Th 28a) * asc-552 Indication without voltage 1s 50V except electrolytic capacitor.
TONDO) ATS. + =o 0 o> 3. VOLTAGE. CURRENT
(Reh POWER IN? sf. stsi 2 i 220v, V}: Signal voltage at 70 W + 70 W. 6M output (1 kHz)
(ston : ! ! A “17: DC voltage {V) at do input signal Value in { —} 1s OC voltage at
taal i ' no u = aczz0v rated power
(NO 4 1 Y So/60Hr = 4. OTHERS
1 ' "
Le2ev) ’ % ; AC BOWER: CORG <=> | Signal route
CFU. ACD i ' Ss 1 ‘A0G - 068 Adjusting point
CFLLACD 5 a € ng The A, mark found on some component parts indicates the importance of
Ys See ? rears eae gIEET the safety factor of the part. Therefore. when replacing. be sure to use
SEMICONDUCTORS x MEATER TRANSFORMER ono ‘ SSO \ uvawironeo parts of denucal designation.
(2) ee Sow wax ‘ , FF
(COL NJM204300 @ 501,502 2SA979 D 402,403 55566 ¢302 ACH- 363 Oe marked: capacitors and, resistors Neve. Barts .unmbers)
02
Tc9162N
503~506
251845
404,408
RDIBEBIHZ
ISEBK
403,404
ACH-390
The
underlined
indicates
the
switch
position
201,202 PROOKG 507,508 2SA1145 cai2 ACH-385
406,407 ROIGEBIHZIGEB)C401, 402 ACH-244 This 1s the basic schematic diagram. but the actual circuit may vary due to
It
@
201A,202A
28C2238(2
SC2275A)
409
ROZ27EB(HZ27EB)
improvements
in
design
203A,204A
2SA968
(2SA9B5A)
410,411
$5566
301,302 28¢2705 0 207~210 RDZ.7EB (HZ 2.7EB) 5 SWITCHES
303,304
2SC
1740S
(2SC2603)
301~
304
ISIS54
SoI~S06
151555
1
$501
PHONO
$507
VOL
UP
$513
MUTING
308,404 280438 305 KZLI4O $502 TUNER $508 VOL DOWN $301 WS (W-S)
401,403 2508364 306,307 1SI554 413~415 ISSI31 $503 CD $509 BAL LEFT
402 288750 401 RBEOz $604 VIDEO AUX $510 BAL RIGHT
7
5
7)
$605
TAPE!
$511
LOUDNESS
THE
UNDERLINED
INDICATES
THE
SWITCH
POSITION
$506 ADAPTOR