Kenwood KAC-887 User manual

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DISASSEMBLY FOR REPAIR
DISASSEMBLY
Remove the metallic cabinet and bottom plate to enable
replacement of resistors, capacitors and transistors. Remove
the lead holder and rear panel before replacing ICs. It is not
always necessary to remove the lead holder and rear panel, if
a flexible screwdriver is available.
) If both ICs on one heat sink block are defective,
unsolder all the IC pins and remove the screws
holding the heat sink to the PC board.
(2) Pull out the ICs and the heat sink from the PC board
and replace them with new ones.
If one of the ICs on a heat sink block is defective,
remove the black heat sink.
©)
Heat sink
Black heat sink
@
O®
Remove screws holding the small heat sink to the PC
board.
Incline the heat sink in the direction indicated by the
arrow (5), remove the screws holding the IC to the
heat sink and replace it.
Unsolder the terminals to replace the capacitor
assembly or the choke coil.
Capacitor Ass’y

Lila
DISASSEMBLY
FOR
REPAIR
/
CIRCUIT
DESCRIPTION
CHECKING PROCEDURE
Connect the GND pattern of the input circuit and the body of
sensitivity switch to that of the output circuit or the chassis of
the capacitor assembly, then connect terminal 3 of the DIN
cord to the power source before checking voltages.
CAPACITOR ASS'Y
|
(
x
GND
Fig. 2
CIRCUIT DESCRIPTION
1. Power ON/OFF circuit
No
power
switch
is
provided
on
the
exterior
of
the
KAC-887.
Instead,
a
relay
and
transistors
(Q5
and
Q6)
are
used
to
turn
the
power
ON
and
OFF.
The
voltage
supplied
through
ter-
minal
3
of
the
DIN
cord
is
used
to
control
Q5
and
Q6.
When
voltage
is
supplied,
Q5
and
O6
are
turned
ON
to
actuate
the
RED
) )F
csp ) Soy D3) eee
+
CO
2B:
\
Sees!
Ppa ( oa
BATTERY
13.8V
relay
so
that
the
power
is
fed
to
the
power
27
dlifier
circuit.
When
it
is
turned
OFF,
the
relay
is
releases
=~
the
power
-
amplifier is turned OFF.

CIRCUIT DESCRIPTION
2. pPC 1230H
This IC is designed so that the IC and speaker are protected
against shorts which may occur between the output terminal
and ground when the IC is used in the BTL-OCL connection.
NON-INVERTING INPUT
(12) GND (OUTPUT)
(8) RIPPLE FILTER
Q) +B (0) BOOT STRAP 1
(1) OUTPUT 1
i
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ou
<
O
Z
=
[om
ee)
>
<
(7) GND (INPUT)
©
N
=
~
a
E
a
.o)
2
THERMAL
PROTECTOR
SURGE
|
Ly
ef
|
©
ee TT
aia :
— |
Bee | |
Q3!
Fig. 4 SCHEMATIC OF pPC 1230H INTERNAL

‘5
CIRCUIT
DESCRIPTION
; 3. ISOLATION AMPLIFIER
@
1h
+
a
R21
O.
=
INPUT
9
- Ol, Sl,
LLL LLL
O
INPUT CIRCUIT
GND
O+B
O OUTPUT
& OUTPUT CIRCUIT GND
Fig. 5 ISOLATION AMPLIFIER
Each
car
audio
component
is
generally
grounded
to
an
appropriate
point
on
the
car
body.
Therefore,
equipment
connected
to
the
power
amplifier
may
have
a
grounding
point
different
from
that
of
the
power
amplifier.
If
there
is
a
potential
difference
between
the
grounding
points,
it
will
be
reproduc-
ed
as
a
noise
in
the
speakers.
In
the
KAC-887,
the
input
Circuit
ground
is
isolated
from
that
of
the
power
amplifier
cir-
cuit
by
using
an
isolation
amplifier
so
that
noise
is
reduced.
Transistors
Q1
and
Q7
in
Figure
5
operate
as
an
inverting
amplifier
and
a
ripple
filter,
respectively,
when
there
is
no
potential
difference
between
the
ground
of
the
input
circuit
®
and
that
of
the
power
amplifier
®).
This
is
because
the
circuit
iS
equivalent
to
the
circuit
in
which
@
and
®)are
connected.
Assume
that
an
AC
noise
source,
Ey
is
connected
between
®
and
(8)
as
shown
in
Figure
6.
The
impedance
of
C63
is
negligible
when
an
AC
signal
is
dealt
with;
therefore,
Ey
is
applied
to
the
base
of
Q7
with
its
phase
and
amplitude
unchanged
and
is
added
to
the
DC
voltage
(V-)
at
the
emitter
of
Q7.
Thus,
the
base
voltage
of
Q1
is
given
by
R21 (Vet+En) +R1 7Ey R21V¢_
Ve
=
R21+R17..——~SO
RT
RTD
Ot
Oe
t
DC
voltage
Noise
This
indicates
that
Ey
is
applied
to
the
base
of
Q1.
Or
the
other
hand,
Ew
is
applied
to
the
connection
between
R25
and
R29
since
the
impedance
of
C5
is
negligible.
Therefore.
the
voltage
level
at
both
the
base
and
emitter
vary
according
7D
En
and
there
is
no
change
in
potential
difference
betweer
the
two.
Thus,
Ey
is
not
output
from
the
collector
of
Q1.
R21
Fig. 6

PC BOARD
POWER
AMPLIFIER
(X07-1920-10)
Foil
side
view
Note:
O
19)
®
i
ev)
®)
{ ee
ot
Refer to the schematic diagram for the values of resistors
and capacitors.
The PC board drawing is viewed from the side easy to check.
t
‘wena?

LR nn re gg a te et
4
MAIN
AMPLIFIER
|
ae
aRRcrerIa
He
CAUTION
=~
This
amplifier
uses
the
BTL
connected
circuit
as
mentioned
before,
so
|
make
sure
of
the
following.
Since
the
ground
line
of
the
amplifier
is
floated, when connecting the measuring instruments (oscilloscope,
VIVM, distortion meter, load resistors etc.), make sure to use the
” QKENWOOD'
A
B
Cc
:
DB)
q
floated
GND
terminals.
When
their
grounds
are
connected
to
the
ground
terminals
of
the
power
supply,
oscillator,
etc.,
the
output
of
(X07
=I9
ak)
a
—_————
eee
ee
ne
i
eee
the
zPC
1230H
will
be
short-circuited
and
IC
may
be
damaged.
[
!
L_
_
—“
x
!
REAR
a
aan
a
ge
|
ie
i]
ar
©
BLK
2
a.
aro
1
=
Y
XC
GND
t
:
HIGH <= LOW —
R2 lo
R10 33K
R'I8 33K
CAPACITOR ASS’Y
|
i ‘ie ee
;
10
BLU
V
I3V
1.3V
OV
OV.
13.6V
13.8V
128.
€7V.
OV
[
0)
Y
v
Tmt
)H
seat
5 6 7 8 9 ev 4 i | | : he
L_ GRY |
Hs =D)
| REAR
OUTPUT
:
Os
da
|
t- | Rch
GRY
Y (CTD (-)
|
ook MOLD (-)
| Rech
J ORG 9s oe
| ’ FRONT
OUTPUT
GRY
Ho ac
A GRN m= ay
Ri2 33K
Prt
Ea
©
DI
8
RED
;
A
OOO
Lif
+8
(+13.8Vv)
ree
31
IOA
A
=.
dl
=
820P
Hi00
I6v
©
.
UPCI230H
> 2SA1175(H,F,E, K)
- 28C2785 (H, F,E, K)
INPUT
>
25C1735(0,E)
> UO5B
.
>
WO6B
. 1$1555 or IS2076
KAC — 887(k)
©
2801735
2SA1175
BPO
t230h
Bees
DC
voltages
are
measured
by
a
VOM
with
20
kQ/V
input
impedance.
- 2$SC2785 Fea.
B e E 8
SPECIFICATIONS
Total Output Power .............. 60 W
Power
per
Channel...............
15
W
into
4
9,
Input Sensitivity
20~ 30,000 Hz, 1% THD
Total
Harmonic
Distortion
......
0.05%
(at
1
kHz,
4
watts)
Frequency
Response
............
20~
50,000
Hz
(+3
dB)
Signal
to
Noise
Ratio.............
92
dB
(A-weighted)
Sire
te
ihe
See
ete
22
mV/110
mV
1
W
Output
Input
Impedance..................
15
kQ/5
kQ
Load Impedance
Power Source
Bice
Saitek
1.3
kg
(2.9
Ib)
Semiconductor
Substitutions
Substitutions
2SA1175 2SA733,
2SA999
2S5C2003
2SC945,
2$C2320
«= 28C1735
2SC2785
na
een
eee
42
(4~8
Q
Allowable)
ees
Fete
Fiat
yet
en
14.4
V
(11~16
V
Allowable)
outa,
142x53x158
mm
7
‘

>
at FL ESD 28 RPO RR OC CRO n Oe Om 2
|
4
a
KAG-887
EXPLODED VIEW
M2.6 x6
y (F) BLK
M2.6x6
(F) BLK
1
M3 x6
‘ (Br-Tap) M3 x6
M3x6
(8r-Tap)
Q)
M3 x6
(Br-Tap)
:(Br-Tap )
3
(Br-Tap)
M3xl2 BLK > N30-30t2- 45
M2.6x6
(m—
(Br -Tap) M3x6 (Br-Tap) BLK : N87-3006-45
M3x6 (8r- Tap) : N8&7-3006-46
M3x 10(B8r-Tap) : N87-3010-46
M2.6x6(F-Tap)BLK : N88-2606-45
KAC-887
KAG-887 KAG-887
+ : New parts.
Parts without Parts No. are not supplied.
Les articles non mentionnés dans le Parts No. ne sont pas fournis.
Teile ohne Parts No. werden nicht geliefert.
Ref. No. Parts No.
ee Bat #8
KAC-887 3
Description
BOTTOM PLATE
BLIND SHEET
HOLDER
A01-0411-03
A23=-1941-04
METALLIC CABINET
REAR PANEL
B46-0055=30
B46-0063-13
B46-0063=13
846-0070=-03
B46-0070=03
WARRANTY CARD
WARRANTY CARD
WARRANTY CARD
WARRANTY CARO
WARRANTY CARD
B46-0070-03
B46-0077-04
B50-3386-00
B50-3386-00
B50-3387-00
WARRANTY CARD
WARRANTY CARD
INSTRUCTION MANUAL
INSTRUCTION MANUAL
INSTRUCTION MANUAL
B50-3387-00
850-3387=00
B50=-3387-00
INSTRUCTION MANUAL
INSTRUCTION MANUAL
INSTRUCTION MANUAL
C91-0195-05 | CAPACITOR ASSY
E30-0619-05
E30-0620-05
E30-0621-05
E30-0622-05
SPEAKER CORD (BLU/GRY)
SPEAKER CORD (RED/GRY)
SPEAKER CORD (GRN/GRY)
SPEAKER CORD (ORG/GRY)
GND CORD
E30-0633-45
E30-0686=05
DIN CODE
OC CODE
F01=-0383=03
F01-0384=03
F95-1031-05
HEAT SINK (CL)
HEAT SINK (CR)
FUSE 250V 10A
H01#3309=-04
H10-1584-02
H12-0084=08
H25-0029=04
H25-0067=03
CARTON BOX
POLYSTYRENE FIXTURE
PACKING FIXTURE
BAG
BAG
H25-0112-04
H25=0173=04
BAG
BAG
J2123029=04
MOUNTING HAROWARE
N99-0054205
N09=0390=05
SCREW NUT SET
HEX.SOCKET HEAD BOLT
X07=1920-10 | POWER AMP PCB ASSY
POWER AMP (X07-1920-10)
C24=21410-61 | ELECTRO 10uUF 25wy
C24-1247-61 | ELECTRO 47UF 16WV
C24"1722°59 | ELECTRO 2,2UF SOWV
C5221782-16 | CERAMIC 820PF K
C2401010"79 | ELECTRO 100UF 10wWwV
C24+1210"79 | ELECTRO 100UF 16WV
C24=1233=71 | ELECTRO 330UF 16WV
C45-1710946
|
MYLAR
O.1UF
M
C25=-1710"57 |ELECTRO 1UF SOwV
C24=21047-69 | ELECTRO 47UF 10WV
C2401247"71 | ELECTRO 470UF 16WV
C90"0564"05 | ELECTRO 15000UF 16WV
C25-171075S7 | ELECTRO 1UF SOWV
C2421247-61 | ELECTRO 47uUF 16WV
C45-1722-26 | MYLAR 0.0022UF Mm
K: U.S.A. U: PX
P: Canada
- AAFES
E: Europe M: Other area
H: Audio club =X: Australia
PARTS LIST
Parts No. Description
Bm ASR
C71-1727-06 | CERAMIC 27PF
L15=0023-05 | CHOKE COIL
$51-1032-05 | RELAY ;
$31-4010-05 | SLIDE SWITCH
V11=0270-05 | U05B
V11-0295-05 | wO6B
V11-0271-05 | 1§2076 OR 181555
V30-0620-10 | UPC1230H
V01=1175-30 | 2SA117S5 (Hp FZE,K)
VO03—-2785-20 | 2502785 (H,F,E)
V03=0452-05 | 25¢1735(D-E)
V03=2785-20 | 25C2785(H,FeE)
V01-1175-30 | 28A1175(HDF,E,K)
Raa ae Re a ca
A product of
TRIO-KENWOOD CORPORATION
Shionogi Shibuya Building, 17-5, 2-chome Shibuya, Shibuya-ku, Tokyo 150 Japan
ar a ae
KENWOOD ELECTRONICS, INC.
1315 E Watsoncenter Rd. Carson, California 90745, U.S.A.
75 Seaview Drive, Secaucus, New Jersey 07094, U.S.A.
1098 North Tower Lane, Bensenville, Illinois 60106, U.S.A.
TRIO-KENWOOD CANADA INC.
1070 Jayson Court Mississauga, Ontario Canada L4W 2V5
TRIO-KENWOOD ELECTRONICS, N.V.
Leuvensesteenweg 504, B-1930 Zaventem, Belgium
TRIO-KENWOOD ELECTRONICS, GmbH
Rudolf-Braas-Str. 20, 6056 Heusenstamm, West Germany
TRIO-KENWOOD FRANCE S.A.
5, Boulevard Ney, 75018 Paris, France
TRIO-KENWOOD SVENSKA AB
Kemistvagen 10A, 183-21 Taby, Sweden
TRIO-KENWOOD AG
Unterboesch 6331 Huenenberg/ZUG Switzerland
TRIO-KENWOOD (AUSTRALIA) PTY. LTD.
30 Whiting St., Artarmon, N.S.W. 2064, Australia
KENWOOD & LEE ELECTRONICS, LTD.
Wang Kee Building, 5th Floor, 34-37, Connaught Road Central, Hong Kong
© 1981-5 PRINTED IN JAPAN B51-1213-00 (T) 2313