JVC DX-E78BK User manual

AX-E78BK
AX-E79TN
DX-E78BK/DX-E79TN
(Unit
No.
AX-E78BK/AX-E79TN)
Note
1.
This
manual
is
for
one
part
of
the
titled
model
consisting
of
the
plural
units
as
detailed.
Part
of
Model
[|
__Manuai
No.
|
AXETERKIAXETSIN
|
_AMpUFIER
[20423
|
FD.WETSBKMD-WETOTN|
CASSETTE
DECK
20826
PRE7BBKIFMETOTIN§
|
——SsTUNER
2.
AX-E78BK
or
AX-E79TN
is
needed
for
the
power
supply
when
servicing
the
unit
not
provided
with
the
power
(mains)
cord.
:
Contents
Safety
Precautions
......-.---++seerereeee
1-2
Schematic
Diagrams
....-.
Leese
sates
insertion
Instruction
Book
......---+-eeee
errr
eee
1-3
_—-
Printed
Circuit
Boards
.......-----++
Insertion
Description
of
ICs
......----
Cute
ieadaees
1-26
Block.
Diagram
.......--
ee
ahuRicard
ae
Insertion
Disassembly
Procedures
......----+-++++:
1-28
Parts
List
=
....--
Separate-volume
Insertion
No. 20423
June 1993

AX-E78BK
AX-E79TN
Safety Precautions
. The design of this product contains special hardware and many circuits and components
specially for safety purposes. For continued protection, no changes should be made to the
original design unless authorized in writing by the manufacturer. Replacement parts must
be identical to those used in the original circuits. Services should be performed by
qualified personnel only.
). Alterations of. the design or circuitry of the product should not be made. Any design
alterations of the product should not be made. Any design alterations or additions will
void the manufacturer's warranty and will further relieve the manufacture of responsibility
for personal injury or property damage resulting therefrom.
. Many electrical and mechanical parts in the products have special safety-related
characteristics. These characteristics are often not evident from visual inspection nor can
the protection afforded by them necessarily be obtained by using replacement components
rated for higher voltage, wattage, etc. Replacement parts which have these special safety
characteristics are identified in the Parts List of Service Manual. Electrical components
having such features are identified by shading on the schematics and by ( A\) on the Parts
List in the Service Manual. The use of a substitute repalcement which does not have the
same safety characteristics as the recommended replacement parts shown in the Parts List of
Service Manual may create shock, fire, or other hazards.
. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and
the like to be separated from live parts, high temperature parts, moving parts and/or sharp
edges for the prevention of electric shock and fire hazard. When service is required, the
original lead routing and dress should be observed, and it should be confirmed that they
have been returned to normal, after re-assembling.
. Leakage currnet check (Electrical shock hazard testing)
- After re-assembling the product, always perform an isolation check on the exposed metal
parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack,
contorl shafts, etc.) to be sure the product is safe to operate without danger of electrical
shock.
Do not use a line isolation transformer during this check.
@ Plug the AC line cord directly into the AC outlet. Using a “Leakage Current Tester",
measure the leakage current from each exposed metal parts of the cabinet, particularly
any exposed metal part having a return path to the chassis, to a known good earth
ground. Any leakage current must not exceed 0.5mA AC (r.m.s.). .
e@ Alternate check method
Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000
ohms per volt or more sensitivity in the following manner. Connect a 1,500Q 10 W
resistor paralleled by a 0.15 uF AC-type capacitor between an exposed metal part and a
known good earth ground.
Measure the AC voltage across the resistor (Having 1000
with the AC voltmeter. ohms/volts,
Move the resistor connection to each exposed or more sensitivity.)
metal part, particularly any exposed metal part
having a return path to the chassis, and
meausre the AC voltage across the resistor.
Now, reverse the plug in the AC outlet and
repeat each measurement. Any voltage
measured must not exceed 0.75 V AC (r.m.s.).
This corresponds to 0.5 mA AC (r.m.s.).
Place this
probe on
each exposed
15002 10W metal part.
Good earth ground
Warning
1. This equipment has been designed and manufactured to meet international safety standards.
2. It is the legal responsibility of the repairer to ensure that these safety standards are
maintained.
3. Repairs must be made in accordance with the relevant safety standards.
4. It is essential that safety critical components are replaced by approved parts.
5. If mains voltage selector is provided, check setting for local voltage.
1-2 (No.20423)

AX-E78BK
AX-E79TN
ve
suoneayyoads
.
|
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(No.20423) 1-3

AX-E78BK
AX-E79TN
Getting started
Check
to
be
sure
you
have
all
of
the
following
things,
which
are
supplied
with
the
system.
cs
i
NY,
AM(MW/LW) Remote Controller Batteries FM Wire Antenna
Antenna - : (only for Germany)
If any are missing, contact your dealer immediately.
How to Put Batteries in the Remote Controller
FM Feeder Antenna FM Antenna Adaptor
(except for Germany) (except for Germany)
Match
the
polarity
(+
and
—)
on
the
batteries
with
the
+
and
—
markings
on
the
battery
compartment.
CAUTION: Observe Proper Handling of Batteries.
To avoid battery leakage or explosion:
¢ Remove batteries when the Remote will not be used for a long time.
When
you
need
to
replace
the
batteries,
replace
both
batteries
at
the
same
time with
new
ones.
e
¢ Don’t use an old battery together with a new one.
* Don’t use different types of batteries together.
Connecting the Speakers
Main Speakers
Connect to SPEAKERS A
For
each
speaker
connect
one
end
of
the
speaker
wire
to
the
speaker
terminals
on
the
back
of
the
amplifier
and
one
end
to
the
speaker.
On
the
back
panel:
1. Open each terminal.
Insert
the
end
of
the
speaker
wire
as
shown
(be
sure
to
remove
the
insulation
at
the
end
of
each
wire
first).
2.
3. Close the terminals to clamp the speaker wires firmly in place.
4.
Connect
the
red
(+)
and
black
(-)
terminals
of
the
right
side
speaker
to
the
red
(+)
and
black
(~)
terminals
marked
R
on
the
amplifier.
Connect
the
red
(+)
and
black
(—)
terminals
of
the
left
side
speaker
to
the
red
(+)
and
black
(—)
terminals
marked
L
on
the
amplifier.
Right Left
speaker speaker
Surround Speakers
Connect to SPEAKERS B
Left
ater
Right
.
surround
speaker
Important Cautions
SPEAKERS
CONNECTION
switch
If
you
are
connecting
the
speakers
only
to
the
Main
Speakers
(SPEAKERS
A)
ierminals,
set
ithe
SPEAK-
ERS
CONNECTION
switch
to
the
BJ
ONLY
side.
-
EXoniy> -A-E
tT
If
you
are
connecting
the
speakers
to
both
Main
Speakers
(SPEAKERS
A)
and
Surround
Speakers
(SPEAKERS
B)
terminals,
setthe
SPEAKERS
CON-
NECTION
switch
to
the
Jj
+
EJ
side.
Bion; r-
IMPORTANT:
Use
speakers
with
the
correct
impedance.
The
correct
impedance
is
indicated
on
the
rear
panel.
3
1-4 (No.20423)

AX-E78BK
AX-E79TN
Connecting the System Control Cards and Connecting Auxiliary
Equipment
Connect the components exactly as illustration.
CAUTION: First make all connections before plugging the Unit into any AC power outlet.
When you plug-in the system
connector, make sure that the
white line of the system con-
necting cords is seen on the
left.
Press the middie of the
connector unit until it
clicks into the male con-
nector.
Pull the connector out.
Never puli on the cords
themselves, fy
Tuner/Timer
S.E.A. Graphic
Equalizer
CD Player
icm icm
There are three ways to lay out the system as shown above:
Tuner/Timer
pas The!
Tuner/Timer
Amplifier
S.E.A. Graphic
Equalizer
CD Player
Tape Deck
¢
Leave
a
space
of
at
least
1
cm
on
both
sides
of
the
amplifier
and
keep
the
back
at
least
10
cm
from
the
wall
for
ventilation.
¢
If
the
system
does
not
work
will
or
needs
repairing,
please
take
all
the
components
with
you
to
the
nearest
agent.
(No.20423) 1-5

AX-E78BK
AX-E79TN
Connecting
the
FM
and
AM
Antennas
FM
Antenna
Connections
Outside
FM
Antenna
Wire
AM Loop antenna
J
1-6 (No.20423)
AM Antenna Wire
Note: Even when connecting
an outside AM antenna, keep
the
indoor
AM
loop
connected.
A.
For
Germany
©
Using
the
supplied
Wire
Antenna
The
FM
wire
antenna
provided
can
be
connected
to
a
FM
75-ohm
COAXIAL
as
a
temporary
measure.
@
Using
the
Coaxial
Type
Connector
(Not
Supplied)
A75-ohm
antenna
with
coaxial
type
connector
(DIN
45
332)
should
be
connected
to
the
FM
75-ohm
COAXIAL
terminal.
B.
For
Other
Countries
B-1.
Using
the
Supplied
Feeder
Antenna
®
Attach
the
feeder
antenna
to
the
FM
connector
as
Shown
in
the
figure.
@
Connect
the
FM
connector
to
the
FM
75-ohm
COAXIAL
terminal.
B-2.
Using
FM
75-ohm
antenna
Cable
(Not
Supplied)
©
Open
the
claws
at
both
sides
and
remove
the
cover.
@
Move
the
conductor
wire
from
to
®
using
tweezers
or
a
similar
instrument
(only
when
using
coaxial
cable).
®
Fix
the
coaxial
cable
and
its
core.
®
Put
on
the
cover.
®
Connect
the
FM
connector
on
the
FM
75-ohm
COAXIAL
terminal.
Note:
Make
sure
the
antenna
conductors
do
not
touch
any
otherterminals,
connecting
cards
and
power
card
in
the
system,
This
could
cause
poor
reception.
For Germany
Extend
the
supplied
wire
antenna
horizontally.
For
Other
Countries
—
=
Unfold
the
loops
of
the
supplied
dipole
FM
feeder
antenna
and
extend
them
as
shown.
Fasten
them
up
in
the
position
which
gives
you
the
best
FM
reception.
Before
attaching
a
75
ohm
coaxial
lead
(the
kind
of
round
wire
going
to
an
outside
antenna),
disconnect
the
supplied
dipole
indoor
antenna.
If
reception
is
poor,
connect
the
outside
antenna.
How
to
Strip
the
75-ohm
Coaxial
Cable
1.
Strip
back
the
outside
covering
of
the
75
ohm
coaxial
cable
to
expose
the
braided
metallic
mesh.
2.
Pull
the
mesh
back
and
twist
into
a
single
connector
as
shown.
3.
Strip
the
insulation
about
10
mm
back
from
the
central
wire.
4.
Attach
to
the
supplied
Antenna
Adaptor,
as
shown
in
the
diagram
above.
if receptions is poor, connect the
outside antenna.
Snap the tabs on the loop
into the sluts of the base to
Tum the loop until you
: 3 assemble the AM loop.
have the best reception

Using the
Amplifier
SD stancer
POWER
ON:STANOBY
Caution: Too LOUD!
ACTIVE BASS EXTENSION
AX-E78BK
AX-E79TN
ie the Power Switch
Press the POWER switch to turn on the stereo system.
When the POWER switch is not pressed and the power cord is plugged in, the'stereo isin STANDBY mode
and STANDBY indicator lights. In STANDBY mode, the stereo uses a small amount of power (15.5
watts) for the clock, memory contents, and any timers which are set.
2. To disconnect power completely, unplug the power cord.
Adjusting the Volume controls
Volume
Control
Turn
the
VOLUME
knob
to
adjust
the volume
level
of
the
speakers
or
headphones.
CAUTION: Always set the VOLUME control to 0 before turning on a connected source such as a VCR or
Record Player, or starting any other of the sound sources such as the radio, tape, or CD player. Otherwise, if
the VOLUME control is turned up the sudden blast of sound energy can permanently damage your hearing
and/or ruin your speakers.
Balance Control
Tur the BALANCE knob to adjust the left-and-right sound balance in the speakers or headphones.
Bass Control .
Turn the BASS knob to adjust the bass sound quality.
Treble Control
Tum the TREBLE knob to adjust the treble sound quality.
Active Bass Extension
This feature is designed and incorporated to reinforce the bass sound, depending on the volume level to
maintain the richness and fullness of the bass. You cannot control it manually.
Press the ACTIVE BASS EXTENSION button to light the indicator if you want to use the Active Bass
Extension function. To cancel this function, press the ACTIVE BASS EXTENSION button again. The
indicator will go off.
Listening with Headphones
A standard pair of headphones can be connected at the PHONES jack on the front panel. No sound can be heard
from the speakers. Be sure to turn down the volume before connecting or putting on headphones, as high
volume can damage both the headphones and your hearing.
(No.20423) 1-7

AX-E78BK
AX-E79TN
REMOTE SENSOR
7
1-8 (No.20423)
Selecting the Source
Press
the
Source
Selector
button
to
select
the
Source
you
want
to
listen
to.
The
indicator
for
the
selected
source
will
light
up.
TAPE
Press to play a tape
O If tapes are already in the Tape Deck, the tape in deck B will be automatically played.
PHONO
Press to play a record.
TUNER
Press to listen to a radio.
cD
Press to play a CD.
Q IfaCD is already in the CD tray, it will be automatically played back.
VCR/DAT
Press
to
play
the
sound
from
sources
connected
to
the
VCR/DAT
terminals
on
the
rear
panel.
See page 4 for connections of record player, VCR, DAT, etc.
Q
Please
make
sure
to
turn
on
the
power
of
the
record
player,
VCR,
DAT,
etc.,
when
you
want
to
play
back
the
sound
from
them.
Gi)
We
reccomend
that
you
carefully
read
the
instruction
manual
for
the
record
player,
VCR,
DAT,
etc.,
so
that
they
are operated
correctly.
Remote Sensor
Receives the signal for the supplied Remote Controller.
Surround
You
can
enjoy
the
Surround
effect
during
playback
when
the
speakers
are
connected
to
both
the
SPEAKERS
A
(Main
Speakers)
and
the
SPEAKERS
B
(Surround
Speakers)
terminals
on
the
rear
panel
of
the
amplifier.
2
In
this
case,
please
set
the
SPEAKERS
CONNECTION
switch
to
the
A+B
side.

Using the S.E.A.
Graphic
Equalizer
SOUND EFFECT
DEMONSTRATION
DEMO
SEA FLAT
AX-E78BK
AX-E79TN
S.E.A. (Sound Effect Amplifier) is a function which divides playback sound into 7 frequency ranges; 63Hz,
160Hz, 400Hz, 1 kHz, 2.5kHz, 6.3kHz and 16kHz; it then adjusts the sound quality by increasing and
decreasing the level of each frequency range.
The S.E.A. Graphic Equalizer of this unit has Programmed S.E.A. mode and Manual S.E.A. mode.
The Programmed S.E.A. mode has 6 patterns - POPS, JAZZ, ROCK, MOVIE, CLASSIC and CAR. With the
Manual S.E.A. mode, you can create up to 6 patterns of your preference, which can then be stored in the
memory labelled as A to F.
POPS Good for vocal music,
JAZZ Gives a feeling of a live atomosphere. Good for acoustic music.
ROCK Boosted low and high frequencies.
MOVIE Adds breadth to the sound so you feel like you’re in a movie theater.
CLASSIC Set for wide and dynamic sound stereo’systems.
CAR When creating tapcs for usc.in a.car stcrco.
DEMO
This will automatically play back all 6 patterns of the Programmed S.E.A. mode, each lasting for a few
seconds. At the same time, each frequency curve will be shown on the Display.
DEMO playback will be repeated in the following order:
cr POPS > JAZZ~ ROCK MOVIE CLASSIC > CAR =]
Press the DEMO button while playing back a CD, a tape, etc.
Q The indicator for the SEA ON/OFF button will light up, turning on the S.E.A. function automatically.
“DEMO” will blink on the Display and the DEMO playback will start.
To cancel the DEMO playback, press the DEMO button again.
Q “DEMO” on the Display and the indicator for the SEA ON/OFF button will both go off, and the S.E.A.
function will be automatically cancelled.
vane a Programmed S.E.A. pattern
Press the SEA ON/OFF button to turn on the S.E.A. function.
The indicator will light up.
Make sure that you see “PROGRAMMED” on the Display. If you see “MANUAL”, press the
PROGRAMMED button of SEA PRESET to change to the Programmed S.E.A. mode. “PROGRAMMED”
will now come on the Display.
2. Selecta S.E.A. pattern by pressing either the A or v button of SEA PRESET.
eA
+ POPS/A «+ JAZZ/B «> ROCKIC «+ MOVIE/D <> CLASSIC/E + CAR/F <>
v~-
Creating your own patterns using the Manual S.E.A. mode
1, Press the SEA ON/OFF button to turn on the S.E.A. function.
The indicator will light up.
2. Press the FLAT button. “MANUAL” will be shown on the Dispaly and a flat line indicating the “0”
frequency level will be seen.
3. Press one of the buttons of SEA CONTROL.
The range you have selected from between 63Hz (low) to 16kHz (high) will start blinking.
If you press the SEA CONTROL button without first pressing the FLAT button, the range for the
pattern which is currently being called up will start blinking and the MANUAL S.E.A. mode will be
automatically set.
(No.20423) 1-9

AX-E78BK
AX-E79TN
como. Co)
BG
SURROUND
9
1-10 (No.20423)
vane the SEA CONTROL button, you can now create your own frequency patterns.
: To increase the level of the frequency range which is blinking.
: To decrease the level of the frequency range which is blinking.
, CD : To select a frequency range.
a
Evey
time
you
pressthe
(<_)
or
(CS_)
button,
the
frequency
range
will
change
in
the
following
order.
=
+
63Hz
+
160Hz
«+
400Hz
<
1kHz
«>
2.5kHz
©
6.3kHz
<>
16kHz
«>
Storing frequency patterns you have created with POPS/A ~ CAR/F.
Press
the
MEMORY
button.
“MEMORY”
will
light
up
on
the
Display
and
the
frequency
pattern
by
you
will
blink
fora
few
seconds.
(If
the
pattern
stops
blinking
and
lights
up
instead,
press
the
MEMORY
button
again.)
While
the
frequency
pattern
is
blinking,
press
the
~
or
v
SEA
PRESET
button
to
select
from
POPS/
A
~
CAR/F
to
store
it
with.
Press the MEMORY button again to memorize.
Calling
up
a
pattern
you
have
created
using
the
Manual
S.E.A.
mode
1,
2.
3.
Press the SEA ON/OFF button to turn on the S.E.A. function.
The indicator will light up.
Press
the
MANUAL
button
of
the
SEA
PRESET
button
to
select
the
Manual
S.E.A.
mode.
“MANUAL”
will
light
up
on
the
Display.
Call
up
the
pattern
by
selecting
from
POPS/A
~
CAR/F
using
the
SEA
PRESET
«
or
v
button.
Changing the S.E.A. Display
The
Display
mode
has
2
types
—
PEAKHOLD
and
EQUALIZING
PATTERN.
Pressing
the
DISPLAY
button will alternate the type.
PEAK HOLD
PROGRAMMED
3 UUM
g 2
2
= =
= 5
ee
2s
= 2
Ss =
sk 8
=
=
=
z
3k
=
= =
= =
= =
= =
s =
s =
ik 2.
8
EQUALIZING PATTERN
PROGRAMMED
» POPS/A
JAZZ/B
ROCKIC
MOVIE/D
CLASSIC/E
CARIF
Surround button
You
can
get
even
more
profound
Surround
effect
by
pressing
this
button
when
the
speakers
are
connected
to
both SPEAKERS A and B terminals on the amplifier rear panel.