Pioneer BP-780 User manual

Service
anual
GRAPHIC EQUALIZER/AMPLIFIER
p-7
SPECIFICATIONS
Power source .......... 14.4V DC (10.8—15.6V allowable)
Grounding
system
..........
006
e
ee
eee
eee
ees
Negative
type
Max.
current
consumption
.............
eee
eee
eee
ees
8A
Dimensions
.............+55:
150(W)
X
50(H)
X
150(D)mm
[5-3/8(W) X 2(H) X 5-3/8 (D)in.]
Weidhtcic¢sensetecie erat ete ceded ae 1.3kg (2.9lbs.)
Continuous
power
output
is
12W
per
channel
min.
into
4
ohms,
both
channels
driven
50
to
20,000Hz
with
no
more
than
5%
THD.
Maximum
power
output
..........
0-0.
eee
eee
20W
X
4
Load
impedance
.............---+-
49
(4—80
allowable)
Frequency
response
...............-.
20—50,000Hz
(+
3dB)
Signal-to-noise
ratio
.........
90dB
(IHF-A
network,
at
1W)
DistOnion:.
osc:
eccecy
et
tan
wet
ees
0.5%
(at
1.5W,
1kHz)
WY)
PIONEER
W19
ORDER
NO.
CRT -481-0
US, CA, ES, EW
Input leVel! ssc. oereee eee wae Me COMPO: 7OnV/20k0
LINE IN: 200m V/15k.
BOOSTER: 3V/1200
Equalization
frequency
.......
6OHz,
125Hz,
250H:,
500Hz,
1kHz, 3.5kHz, 10kHz
Gall. 6.5.4 eee con ees en a ae Oe ea eae een a OdB
Equalization range .......... 0.6 e eee eee eee 7%, 212dB
These specifications were determined and are presented in
accordance with specification standards established by the
Ad Hoc Committee of Car Stereo Manufacturers.
Note:
Specifications and the design are subject to possible modifi-
cation without notice due to improvements.
a
a
SS
eee
es
re
ng
PIONEER
ELECTRONIC
CORPORATION
4-1,
Meguro
1-Chome,
Meguro-ku,
Tokyo
153,
Japan
PIONEER
ELECTRONICS
[USA] INC.
P.O.
Box
1760,
Long
Beach,
California
90801 U.S.A.
TEL:
(BOO)
421-1404,
(BOO)
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,
Australia
TEL:
(O03)
580-9911
ET © DEC. 1984 Printe# in Japan

CONTENTS
NAME OF PARTS and THE IR FUNCTION
oe SS
SCHEMATIC CIRCUIT DIAGRAM
(BP-700/US, CA; ES) oie aiciiteitietecs:
1.PARTS LOCATION
NOTE: @
Heat Sink
CNR-256
Power P.C. Board
Button (DEFEAT) ed
* CAE-064
PARTS LOCATION .................cceceeee enone
CONNECTION po. chowciiety ness eycan ta conceaes
CIRCUIT DESCRIPTION ......... eee.
DISASSEMBLY csrincocdstespreteehoctae cds:
phate ices 1 7. CONNECTION DIAGRAM (BP-780/US, CA, ES) ...... 14
peleeuenetarse 2 8. SCHEMATIC CIRCUIT DIAGRAM (BP-780/EW) ...... 17
Saati 4 9. CONNECTION DIAGRAM (BP-780/EW) .................. 20
BAe ned hee 5 10. EXPLODED VIEW. | side cdectssacaecauigtusedndeauciatuncehedeys 23
ee ooeas es 7 11, ELECTRICAL PARTS LIST... ec cseeeeere eee 20
12. PACKING MEHOD 'a ci ioe Sp essen eed seseodececiesareasnaes 29
iieghobeusaes 11
For
your
Parts
Stock
Control,
the
fast
moving
items
are
indicated
with
the
marks
x
x
ands.
|
* *: GENERALLY MOVES FASTER THAN x.
This
classification
shall
be
adjusted
by
each
distributor
because
it
depends
on
model
number,
temperature,
humidity,
etc.
: aM...
Cord (BP-780/US, CA, ES)
CDK-247
Heat Sink
CNR-257
Grille Assy
CXD-702

QUESTIONNAIRE
MODEL
One
Model
per
questionnaire
Dear Servicer,
Thank
you
for
your
cooperation
in
the
post-sale
service
of
Pioneer
products.
This
questionnaire
is
used
as
a
tool
to
improve
the
serviceability
of
our
products
and
service
manuals.
Please
evaluate
this
model
and
service
manual
by
answering
the
following
questions.
Your
ideas
may
be
realized
in
our
future
products.
Your
answers
will
be
appreciated.
Thank
you.
PIONEER ELECTRONIC CORP.
T.
Nakagawa,
Manager,
Service
Section,
International
Division
SERVICING EVALUATION Circle applicable number:
Disassembly /Re-assembly:
. Circuit Checks:
Replacement of Parts:
d.
Adjustment
(s):
1
2
3
£4*4
¥*§
* If (4) or (5) was circled, please be specific.

e.
Your
advice,
opinion
or
ideas
related
to
servicing
this
product.
2. SERVICE MANUAL EVALUATION
a. Circuit & Mechanism Description
b. Circuit Diagram
ae
_
3.
OTHER
|
Please
describe
other
areas
of
servicing
which
you
may
find
difficult.
Completed by :
Company Name :
Address :
City/State/Zip :
Please
send
this
form
filled
to
the
distributor
in
your
country.
Oe
YOU
COUNETY
s.

_ BP-7s0
2. NAME OF PARTS and THEIR FUNCTION
@ Equalizer Switch (DEFEAT)
Press to activate the equalizer control function and iluminate
the indicator on the equalizer control lever.
© Lch Level Indicator
® Rch Level Indicator
Green, orange and red indicators illuminate corresponding to
the left/right output levels.
Fig. 2
@ Equalizer Control
Slides up and down to allow adjustment to suit both the
music and individual tastes. Pressing the equalizer switch
causes each indicator to illuminate.
@ Fader Control
Raising the lever gradually decreases the volume of the rear
speakers, while lowering it gradually decreases the volume of
the front speakers. Adjust the volume of the front and rear
speakers.

3.CONNECTION
Connect
the
components
correctly
as
shown
in
the
diagram.
@
To
ensure
that
all
components
used
in
combination
with
@
Test-connect
all
components
before
securing
them
into
this
unit
operate
properly,
be
sure
to
wire
the
main
power
place.
Test-operate
your
entire
car
stereo
system
to
supply
cable
(red)
correctly
to
the
respectively
determined
ensure
that
there
are
no
faulty
wiring
connections
be-
points.
Failure
to
do
so
or
errors
in
this
process
will
result
tween
this
unit
and
the
rest
of
your
car
stereo
system.
in
total
inoperation.
@
Be
sure
to
connect
only
a
single
component
as
shown
in
@
Be
sure
to
properly
connect
the
color
coded
leads.
Failure
the
connection
diagram.
If
two
or
more
components
are
to
do
so
can
cause
malfunctions.
connected,
internal
circuitry
may
be
damaged
or
an
acci-
dent
may
occur.
|
Input
Selector
|
@
When
using
this
unit
in
combination
with
a
car
stereo
Be
sure
to
set
the
input
selector
before
wiring.
(Fig.
3)
equipped
with
pin
jacks,
see
the
section
entitled
‘‘When
combined
with
a
car
stereo
with
pin
jacks”.
@
Speakers
connected
to
this
unit
must
be
high
power
type
with
over
20W
maximum
input
power
and
have
impe-
dance
between
4
and
8
ohms.
Be
aware
of
the
fact
that
using
a
speaker
other
than
the
one
specified
can
cause
the
speaker
to
be
damaged.
©
A
special
BPTL
circuit
is
used
to
be
sure
that
you
do
not
connect
the
speaker
directly
to
ground
nor
join
the
left
and
right
speaker
(—)
leads.
@
For
detailed
information
concerning
connections
between
different
components
and
this
unit
consult
their
respective
COMPO:
When
connecting
the
unit
with
a
component
car
instruction
manuals
and
follow
those
recommendations
:
stereo
|
precisely.
BOOSTER:
When
connecting
the
unit
with
a
reguiar
car
@
Be
sure
not
to
remove
the
cap
on
the
red
lead
(female
eteren
plug)
of
this
unit
when
not
in
use
to
prevent
shorting.
PIN
JACK:
When
connecting
the
unit
with
a
car
stereo
with
®
Wire
all
connecting
cords
so
that
they
stay
well
clear
of
pin
jacks
high-temperature
areas
such
as
the
heater
exhaust
port.
Fig. 3
ae.
When
Combined
with
a
Component
Car
Stereo
Front Speaker Grech Left
Be
sure
not
to
10
Och
remove the cap.
Green/black
Ea
ole
eee
|
Front
Speaker
Gra
Right
fens
| Red | To @ch Y
|
es
ed
=
Green
—
J
oo
| I
|
Black
|
Gray/black
|
Rear
Speaker
|
—_
To
Och
!
|
A
pee
ee
ire
8
|
i
Gray
|
ee
| |
eg
aa
aes
ellen
[on
2
—
Green/black
* Rear Speaker
To ®ch Gray
Do not connect anything
to this terminal.
Gray/black
;
Fag.
4
Component
car
stereo
oad
Connect
to
the
plus
(+)
circuit
(clock
illmiry
ation,
cassette
deck
I
"
smail
lamp
circuits,
etc.)
of
the
car’s
lighting
wit
ch.
Red .
i
oo
—}y
Connect
this
lead
to
the
power
terminal
which
is
passed
through
the
ignition
switch.
(DC
12V}
Black >
(ground)
Black
Connect
to
metal
body
or
chassis.
wie Connect to metal body or chassis.

When Combined with a Regular Car Stereo
e@ Use a regular power car stereo with a Front Speaker
maximum
output
of
6.5W+6.5W
or
To
@©ch
less.
Black
(ground) Front Speaker
To ®@ch
Connect
to
metal
body
or
chassis.
;
Regular power car stereo
(Unequipped with pin jacks).
Rear Speaker
To(@ch
Rear Speaker
To ®ch
>
(Max. 3A 12V DC)
Remove the cap
and connect.
Front
Fig. 5
Gray/black
Yellow ae p ae
Connect to the plus (+) circuit (clock illumination,
Cie C2 small lamp circuits, etc.) of the car’s lighting switch.
Red
Beas
oe
=_
Connect
this
lead
to
the
power
terminal
which
is
passed through the ignition switch. (DC 12V)
Black
<C Connect to metal body or chassis.
When
Combined
with
a
Car
Stereo
with
Pin
Jacks
Front Speaker
Black ; oa T h
(ground) oe
cm O
Rear Speaker
ight To ®ch
Red
Connecting cords
with pin plugs
(sold separately)
White
Red
Car stereo with pin jacks.
Red or reacertiite
cyas0—
~ ed
Remove the cap
and connect.
(Max. 3A
12V DC)
Connect to metal body or chassis.
Front Speaker
To ®ch
Do not connect anything
to this ae
SaaS Se eae 7
:
Green
|
Left
Aba
ti
|
wal
|
|
Vo
|
|
|
|
=
va
Fig. 6
Gray/black
Yellow
Connect to the plus (+) circuit (clock illumination,
ceo
Cc smail lamp circuits, etc.) of the car's lighting switch.
Red
Connect this lead to the power terminal which is
T ty ty :
[0 passed through the ignition switch. (DC 12V)
Black
<@ Connect to metal body or chassis.

4.CIRCUIT DESCRITION
e Block Diagram
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e Level Diagram
——_—ww
ww
wm
wm
eH
KKK
5
s
=
;
Isolator
OP
780
US/CA/ES
Model
only
AMP
|
I
{
cee
Equalizer
Ic 302
Booster
IN
ee
"
=
S|
pe,
DIN IN
88
O60
(dBs)
+ 10
Booster IN
33dBs
Oo
-9dBs
-10
:
-20
Pre
IN
ant
—21dBs
AMP
°
Audio
Signal
path
(Lch)
©
DP 780
1US/CAVES Model Only
Booster IN
DIN IN
ic 102 6)
(6) ———> _ REAR
(2——> _L ch
explanation
Division
and
synthesis
A
signal
will
be
input
to
pin
12
of
IC
30l
Symbols
and
a
signal
will
be
output
from
pin
13
QIO!
Q102
QIO3
Qi04
Qi0s
Qi0G
1C303
Power Amp
IC 101
ae
>
FRONT
S2
VRI08
Loh
Ic 102
Pe. REAR
Lech
+iOdBs
Power Amp
+44dB
Volume loss
B
Fig. 8
Fig. 9

5.DISASSEMBLY
e Removal of Case
1. The case can be removed by removing the four screws
labled “A.”
Fig. 10
¢ Removal of Chassis
1. The Chassis can be removed by removing the five screws
labeled “B” and the two rivets.
Fig. 11