Pioneer DC-X77S Schematic
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ORDER
ARPl336
STEREO DOUBLE CASSETTE TAPE DECK AMPLIFIER
DG-X772
/oE.
NO.
MODEL DC-X772 COMES
TyPe
HB AC22OV. 24OV
HE
SD
HE2
a
This service manual is
a
As
to th6 HE and SD types,
a
As to the oth€r typ€s,
AC22OV.
AC11OV, 12O-127V
AC22OV,
AC24OV only Australia
Ce manual
Este manual
a
2 4OV
24Ov
d'instruction
de servicio trata del m6tode
IN FIVE VERSIONS
Powea roquiromont
(swatchable)'
(swrrchable)*
,22OV ,24OV
(
switchable)
applicable to the
please
refbr
se
CONTENTS
1.
SPEC|F|CATTONS ......
2.
EXPLODED VIEWS AND PARTS LIST ....,.
3.
MECHANICAL
IN
OUTL
SCHEMATIC DIAGRAM
4.
P.C.BOARDS
5.
SECTION OPERATION
E
CONNECTION DIAGRAM......
DISTINGUISHED AS FOLLOWS:
United
European Continent
(switchabl€)
"
General market
Wast
HB, HE and SD typ6s.
please
refer to
pages
51.
refer to additional service
mode
au
de r6glage, en
ajuste escrito
2
9
14
6. ELECTRICAL PARTS LIST,
7, ADJUSTMENTS
7. REGLAGE
7.
AJUSTE
8. PACKING
9. FOR HE AND SD TYPES
Exoon dostination
Kingdom
Germany
change the
manual.
franqais.
en espafrol.
primary
.......
wiring,
please
refer to
page
35
40
45
50
5l
PIONEER ELECTRONIC CORPORATION 4-1. r\,4esuro 1
PIONEER
PIONEER ELECTRONICS OF CANADA, lNC. 505 Cochrane
PIOI{EER ELECTRONIC
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184
ELECTRONICS SERVICE lNC. P
IEUFOPEI
N.V. Keetberglaan 1.2740
O. Box
1760.
Lono Eeach Ca
Bo!ndarv Road. Braesrde. Vrctofla3195. Australia TEL:
N4arkham,
dnve.
Beveren, BelgrumTEL 03/775 28.A8
chome, r\y'esuro,ku, Tokyo ts3, Japan
orn a 90801 U S.A.
Ontano L3R 688Canada
TEL:
14161
479 4411
580-9911
I03l
SAC)fEB
rc37 Pr'nled in
'apan
1.
SPECTFTCATTONS
Continuous Average Power
Watts*
per
channel, min., at 8 ohms f rom
Output
is 27
40 Hertz to 20,000 Hertz. with no more
than
0.37" total harmonic distortion.
'Measured
Trcde Regulation tules on Powet
Continuous Power
40 to
1 kHz
1 kHz
Graphic equalizer trequency band .......... 100 Hz, 330 Hz,
Hum
PHONO ................ ...._......_..._._ 72
Hum and Noise
PHONO
Total Harmonic Distortion
15 Walts
o.20/o
Tape Deck
Systems
Heads ...................................
Motor ....................
Wow
Fast Winding Time ..............
pursuant
Output
20,000 Hz ......... 27 W + 27 W
(DlN)
(DlN
and Noise
................. ..... 68 dB/60
per
power)
music
(lHF,
(DlN
continuous
channel
Federcl
to the
33 W + 33
'1
kHz,
short - circu ited, A network)
(40
power
output
Ttade Commission's
Output
(T.H.D.0.3%
(T.H.D.
W
(T.H.D.
kHz, 10 kHz,
3.3
Power/5o mW)
Hz
to 20,000 Hz, 8 ohms)
..............
Section
.................
Flutter
and
4 track, 2-channel stereo
Recording/playback head x
Playback head x 1
DC servo 2 speed motor
No more than 0.13%
Approzimately 105
tape)
Claims
I
ohms)
1% 8 ohms)
50 W + 50 W
1% 8 ohms)
i7
No more than
Erasing
head x 1
(WRMS)
seconds
fol
dB
dB
dB
x 2
(C-60
Frequency Response
-20
Normal tape
CrO, ............ .. . . .
Signal to Noise Ratio
Dolby
Noise Reduction
Dolby
recording:
dB
NR OFF
B lype NR
Effect
ON
...
Hz
35
to 14,00O
Hz to
35
......................... 56 dB
...... More than 10 dB
'15.000
(at
Hz
Hz
5 kHz)
Furnished Parts
Operating
Turntable fegs
Instructions
.......................
parts
...........................................................-. 2
1
M iscellaneous
Power requirements
European model
U. K. model
Australian model .............. .
destrnation
Other
Power
European model ..........................
U.K. model
Other
1
Dimensions
Weight
Specilications and
out
Consumption
destination models .................. ..................... ... 210 W
(without
notice
due to imp@vement
models
AC 110/120-127l22O/240 V
........... ...................... 210W
360(W) x 190(H) x 283(D)
14-3l16(W) x 7-1t2\H) x 11-1l8(D) in
package)
design subject to
.................................. 6.8 kg
AC 220 V,
AC 240 V, 50/60 Hz
AC
(switchable)
possible
modtications with
Hz
50/60
240 V, 50 HZ
50/60
Hz
210 W
mm
(15
lb)
J
llzl
2.
EXPLODED
VIEWS
AND
PARTS
3
LIST
F\.'\
tt
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4"
N
YNI
1
2
3
4
5
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c
4
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5
D
4l-
6
I
NO?XS:
.
Parts uithout
o
The
sofety
desEnotaon.
.
.
your
Fot
marks
**
CENERALLY
cld$ificatioa
This
model
Parts marked
than
port
morh
-i,
factor
A *
nutnber,
usual or lhe!
found
the
of
Potts Stoch
'l
ond
,
temperoture,
"
by
number con^ot
on aome compone^t
port.
Thercfore,
Control,
be odiusted
not always
are
unavailable.
FASTER
humidity,
MOVES
should
"
6
may be
be supplied
replocing, be 'urc
when
the
fast
THAN
b! eoch
etc.
kePt in sloclc
ports
indicotet
mouing items
*
distributot because
Theil delivery lime
the importonce
parts
to use
ate indicoted with
of identical
it depends
mat be longer
of the
the
orr
Parts List
Mark
A*
No.
10 AXAl004
11 AAD1003
12 AADl115
'13
14 AAE1038
15 AAE1039
16
17 AAEl041
18 AAEl042
19
20 AAE1044
21 AAE1045
22 AAK1190
23 AAK1191
24 AAK1192
25
of Exterir
Part No. Description
1 AWZI289
2 AWZ1309
3 AWZ1310
4 ATS1070
(Ars1065)
AEK-507
5
AEK-s10
6
7 AEK-s11
AAWl003
8
9 AMRI124
AAD1 1 16
AAE1040
AAE1043
AAK1 193
Main assembly
Mechanism control assembly
REC Amp assembly
Power transformer
l.11.
Fuse
Fuse
Fuse
Counter
Power
Damper assembly
Knob
Knob
Knob
Knob
Knob
Knob
Knob
Knob
Knob
Knob
Knob
Amp
Door
Door
^C22OV
/24OV)
(FU1,T800mA)
(FU3,T1.6A)
(FU4,
FUs,
joant
(POWER)
(FUNCTION)
(DOLBY NR)
(REC)
(PAUSE)
(FAST
RWD)
(FAST
FwD)
(PLAY)
(STOP/EJ
(SYNC)
(VOLUM
panel
panel
panel
ECT)
E)
R
L
T2A)
Part No.
No.
41 BBZ30PO80FZK
42 VSZ30PO60FMC
43 VBZ30PO80FMC
44 VPZ30K)80FZK
45 VPZ30P'r
46 BBT3OPOSOFMC
47 VMZ30PO60FMC
48 AEC-194
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
OOFMC
Description
Screw
Screw
Screw
Screw
Screw
Screw
Screw
revet
Nylon
Chassis
panel
Rear
Bottom
SYNC shaft
Keep
P.C.B Holder
P.C.B Support
Heat sank
Earth
Cassette
Graphic
Switch
LED assembly
Connect
Cushaon
plate
plate
lead
mechanism unrt
EO assembly
assembly
assembly
rubber
panel
26 AAKl194
27 AAKl195
28 AAN
29
30 AMBl 136
1035
AAN1036
ANElOO2
Deck
Deck
Door R
Door L
Front
Bonnet
panel
panel
cas e
A
B
32
33
AAX1O54
34
35
36
*t
37
38 AEC-847
A
A
39 AEC-882
40 ADG-Os1
1025
A8H
ABH1026
AEB-31O
AEB1012
Fluorescent
Door spring R
Door spring L
Counter be
Non slip
Leg assembly
Straan relief
sheet
lt
A
B
2
3
g7
L
C
,-fA<
51
/
59
5'B
,*rP
W
)
65
fl
F
.t"
,n_-/Il,
56
I
116'
-
d
A
40
lh /'
45
$
2l
..t
,.'
,f
5
-
D
-l6
2
{l
*s>
3
J,
,/
N
f
4
5
6
L
A
B
4
5
c
D
6
I
Mechanism
Mark No. Part
unit
1 AZN1273
2 AZN127
N'! 241
3 AZ
AZN1275
4
5 AZN1276
6 AZN1277
7 AZN1278
8 AZN1279
AZN1280
9
10 AZN't 281
1 1 AZN1282
12 AZN1242
13 AZN1243
14 AZN1244
15 AZNl245
16 AZNl246
17 AZN1247
18 AZNl248
l9 AZNl249
20 AZN1250
21 AZNl251
22 AZN1252
23 AZN1253
AZN1254
24
25 AZN1255
26 AZN1256
27 AZN1257
28 AZN1258
29 AZNl259
AZN1260
30
31 AZN1261
AZNI262
32
33 AZN1263
34 AZN1264
AZN1265
35
AZN1266
36
37 AZNl267
AZNl268
38
39 AZN1269
40 azN1270
41 AZN1271
42 AZN1272
43 AZNl283
44 AZN12A4
45
AZS1029
46 AZS1030
47 AZX1011
48 AZS1031
49 AZS1032
No.
Description
Pause arm
4
AS arm
spring
Pack
lever
Stop
FF lever
lever
REW
REC lever
REW arm
Lock cam(A) assembly
Capstan sh6ft
Sensor
Head base
REC sensor
ldler arm
Lever
Lever base
Palse
Clutch arm assembly
T reel assembly
S reel
FF
Tape
Eiect
Eject
ldler
P roller arm
Belt
Housing assembly
Head
Head spring
ldler arm
Auto arm spring
Pause
Lever spring
Cam
Clutch arm spring
Ejecr spring
Back tension
Lever spfing
P roller arm spring
Dubbing spring
Flywheel assembly
Leaf switch
Leaf switch
Leal switch
Leaf switch
(S)
cap
(Ai
base
(B)
cam
gear
guide
(F)
lever
(W)
lever
chassis spring
spring
lever spring
spring
{POWER)
(PLAY
{REC)
assembly
(A)
spring
MUTE)
(CrO2)
(R)
Mark
No. Part No.
50 AZX1012
AZPl012
51
52 AZP1013
AZB'I 06r
53
54 Az81062
AZB1063
55
AZB1064
56
AZB1065
57
AZB1066
58
AZB1067
59
60 AZ81068
AZB1069
61
AZe1070
62
AZB1 OT
63
AdB107
64
AZB1073
65
AZB1074
66
AZ81075
67
68 AZ81076
AZB1077
69
70 AZB1078
71 ANG1 1
72 ANZ1359
AZB1 108
73
101
102
103
104
105
106
107
104
109
110
111
112
113
114
115
17
18
19
20
121
122
l
2
13
D€scription
Motor assembly
head
RP
head
E
(A)
Screw
(P)
Screw
Sems Screw
tite
Tap
Tap tite screw
Binding scrow
Washer
Screw
Tap tite screw
Tap tite screw
Tap
Bush
Polyslider
Polyslider
Polyslider washer
Polyslider
Polyslider
Plain washer
Mech6
ldler arm assembly
Tap
Chassis
Head
Motor bracket
Bution
Button
Bufion
Flywheel
Sub
SW
Button shaft
screw
head screw
(C)
tite screw
washer
washer
washer
washer
(L)
braket
tite screw
assembly
{W)
chassis
bracket
bracket
pulley
Motor
lnsulator seat
Dubbing
plate
MD
guard
SW
Nylon band
5P head
head
3P
12P wire assembly
10P wire assembly
wire
Earth
(FW)
bracket
bracket
bracket
(RF)
lLW)
(C)
weight
(F)
(W)
Lever
wire assembly
wire assembly
a
3. MECHANICAL SECTION
The operation outline of this
l.
Operation selection
assist mechanism
2. Driving system.....
3. Head.....Fixedhead
4.
Auto-stop system.....
stop
5.
Operation
6. EJECT system..
The following will
respective modes.
3.1.
STOP
The head
levers come down to their specified
into
stop mode when the respective switches are OFF.
3.2.
PLAY MODE
(l)
When
the
turned
assembly which
up
to the
spring
ON.
lock
(2)
At the
pushes
pinch
the
roller
(3)
At the
causing
take-up
system. . . . . Lever lock system
. ..
describe
MODE
chassis assembly and
PLAY lever
left
direction and the
ON.
specifred
and the PLAY muting
In
addition.
cam.
same time,
up
the
roller
to the
same time,
the take-up reel
of tape and
is
At
the same
is linked
the PLAY lever
pinch
arm to
capstan and
the PLAY idler
unit is
system . . . . . There is
I motor
REC+PLAY
STOP-EJECT system
pressed.
position
the head
pressure
becomes into PLAY mode.
belt drive
operations according to their
the respective operation
the lock
power
time, the head
to the
with
pressure
commences tape running
table to rotate
follows:
as
power
no
and PLAY auto-
positions
play
switch
chassis. while rising
contact
and become
moves
cam
supply
the head
is locked with
contact the
is also
switch is
chassis
lever is
pushed
chassis
being turned
spring within
pinch
pushed
and to
begin
the
OPERATION
to
up
Take-up
Head
chassis
spnng
PLAY muting
chassis assemblv
Head
reel table seen
PLAY idler
SW
PLAY
lever
Fig. 3-2. PLAY mode
3-3. PLAY-STOP
Mechanically,
mentioned PLAY
(l)
When
the left
same
supply
(2)
At
the same time,
while
reel table
(3)
At the same
pinch
pressure
it operates in reverse
mode.
STOP lever is
direction and releases the PLAY
time, the PLAY muting
switch are turned
the head
roller
chassis comes down, and
stops as
time,
and
capstan by
contact spring and
OUTLINE
front side of mechanism
Head chassis
diagram
OPERATION
(See
Figs.
3-l and 3-2.)
pressed,
the PLAY idler is
also
release
the lock
switch
OFF.
the
take.up of tape.
pressure
the
pushing
stop the tape
Capsta
Pinch
roller
Pinch
contact
assembly
of the
moves
cam
lever. At
and
pushed
the take'up
contact of
up
the
n
arm
pressure
spflng
afore-
in
the
power
down
the
pinch
running
STOP lever
Fig.
3-1. PLAY mode
Left
Right
diagram
(motor
Power supply
direction
direction
installing side)
switch
3-4.
PLAY-PAUSE
o
PAUSE
(l)
When
the PAUSE
assembly
the PLAY
the PLAY
And with
position
o
PAUSE
.
Head comes
PLAY
.
Pinch roller
.
PLAY idler
.
Play muting
position
ON mode.
.
Clearance
.
Clearance
mode
the PAUSE
(linked
idler and PAUSE
idler
PAUSE
and becomes into
position
down 1.7 mm
does not
does not
switch and
pinch
of
play
of
lever is
pushes
lever
pinch
to
pinch
and
cam, it is locked
contact with
contact
roller :
idler
mode-PAUSE
pressed
down
roller)
roller
PAUSE mode.
at center value from
power
1.7 mm at center
mm
: 1.7
in
PL,AY mode,
the head
which is linked
arm. At the same
pressed
are
at the PAUSE
the capstan"
with
the reel table,
supply switch
at center
release
chassis
to
timg
down
the
are in
o
PAUSE
(2)
Nexg
PAUSE
(l).
the PLAY
release
when
the
cam is released
The
PLAY
mode
PAUSE
idler
and tape running
lever
in the movement
pinch
and
pressed
is
roller
then
recommences.
again,
reverse
return
the
to
to
3.5.
(a) (Motor
REC
DETECTION
F
PAUSE
PLAY/PAUSE
lever
installing
OPERATION
PAUSE
AUSE lever
(ldler
Solid
Dotted
(ldler
side)
Fig.
3-3.
Head
assembly
cam
pinch
and
line
line
and
pinch
roller)
PLAY
mode
lt
PAUSE
PLAY-PAUSE-PAUSE
AND
roller)
mode
mode
diagram
REC
OPERATION
chassis
ts
release
PLAY idler
(b) (Front
Take-up
side)
reel
ldler
Capsta n
arm
t
Pinch
table
roller
1.
REC
REC
sensor detects
erroneous
When
there is
lever
can be
When
there is
(REC
lever
Fig.
detection
erasure
prevention
claw, recording
pressed)
no
claw,
cannot
be
3-4. REC
operation
the existence
claw
of cassette half
may be
recording
pressed)
REC
Cassette
detection
cannot be
operation
or otherwise
performed (REC
performed
of
2.
REG
and
When
ON. The
and
REC
REC
thereby
mode.
JB!,-Y
--t
Fig.
3-5. REC operation
operation (Be
PLAY
others
REC
diagram
rear
r_-l
Il5ff
lever
lever
tape
button
of mechanism)
pressed.
is
are
the
running
ooeration
(Seen
Lever return
'ever
I
tij
t_r
t
to
press
sure
simultaneously)
the
REC
switch
same
from
operation
is
started"
as
and
/
sprins
r_l
t
(REC
installing
REC
tever
is
turned
pLAy
becomes
REC
side)
mode
switch
REC
into
lever
3-6. REC
Function
PAUSE
(r)
(2)
3.7.
(l)
(2)
same
-
PAUSE RELEASE)
-
REC
REC
SW and PLAY
PAUSE
REC function
REC-STOP
When
STOP lever is
lever
and PLAY lever
and REC lever
the REC
OFF.
The
other
operation
-
PAUSE
to the
PAUSE
_
PAUSE RELEASE
starts
-
description in item
SW
again.
OPERATION
pressed
are
returned
are
switch
and PLAY muting
operations
are the same
PAUSE
except for the followings.
keep
and the locks
released
by the return
RELEASE
(PLAY
5
REC
condition.
of REC
the PLAY lever
spring
switch
are turned
as PLAY-STOP
and
Stop mode
clutch
-
Reel
arm spring
gear
FF
sear
{
Clutch
arm
clutch arm orotrusion
diagram
gear
F/R
Supply
)
reel
Power
gear
supply
switch
-\--
cam
-
Lock
_JL
3-8. FFIREW
o
FF
operation
(l)
When the FF lever
(2)
o
(l)
(2)
REW
direction,
is locked
At
becomes
F/R gear
engages
the
operation.
Lock
lever
ON
At the
linked
direction
F/R
nearing
gear
rotate
the
with the lock
the
same
in
is
the F/R gear
reel
begins
operation
cam moves
pressed"
is
and is locked
same
to the
the
gear
is
the
with
the
and
becomes
OPERATTON
pressed
is
power
supply
time,
free
state
moved
time, when
simultane-ously
supply
by nearing
to rotate
in the
the
with
REW lever, pushes
protrusion
reel
supply reel
into
cam.
protrusion
the
due
with
left
power
the lock
the
of the
gear
gear.
REW
switch is
to the
FF
and
direction
supply
REW
lock
cam moves
shape
it
to the
gear
(reel
becomes
when
switch
cam.
arm
clutch arm.
moved in
and
engages the F/R
Then
the reel
operation.
turned
of
clutch
of FF
FF
gear).
(S),
in
to the
the
in left
ON and
arm
lever.
gear
and
Then
into
FF
the REW
is turned
which
left
Then
the
direction
begins to
(a)
STOP
REW
is
(b)
mode
REW
FF
mode
diagram
REW lever
mode
agram
/\
1,\0
,.'
\'1
C
!q-l
JHI
itot I I
-u
!l(tJl?....1
FF
(c)
,R
t'k
/1.
'r:t
ttl
----)
lever
FF mode
?
E
:
E
ILJ
til
r-5'r
.Y
ti
lFJ-
l(
r
3-6. FFlREW operation
Fig.
(Seen
from rear of mechanism)
(Motor
installing side)
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