Technics SH-EH50 User manual

ORDER NO. AD9703031C8
ervice
Manual
syacnpeeEnes
Sound
Processor
S
=
_
=
=
5O
For (E) / (EP) areas
*! SB-EH60 *! SB-EH60 Colour
Ta ral P som (K) ...... Black
SL-EH50 SH-EH50 Area
(E)/(EP) ... Europe, Russia.
(GC) ........ Asia, Latin America,
Remote Control Middle East and
A Transmitter Africa.
For (GC) area
* SB-EH50 si-EH50 SH-EH50 ~ SB-EH50
es
ssi?
SS
[For
(GC)
area
only]
i wp 2 SB-PC60
D0 [potsy surrounp
PRO-LOGIC
*2SB-PS60 nn il
Remote Control
Transmitter
Because of unique interconnecting cables, when a component
requires service, send or bring in the entire system.
Specifications
EQ/SFP Section Spectrum analizer Section
MANUAL
GEQ:
Display
mode
:
NORMAL,
PEAKHOLD,
AURORA
Center frequency ; 100 Hz, 315 Hz, 1 kHz, 3.15 kHz, 10 kHz General
nevel
conttel
+3,6,9dB
Dimensions
:
287
(W)/89
(H)/273.5
(D)
mm
EQ
SPACE
mode
(3
modes)
:
HALL,
CLEAR,
HEAVY
Weight
:
1.1
kg
Acoustic Image Selector : 36 pattern
DOLBY
PRO
LOGIC
Section
[For
(GC)
area
only]
Note:
Specifications
are
subject
to
change
without
notice.
PRO
LOGIC
mode
:
SURROUND,
3
STEREO
Weight
and
dimensions
are
approximate.
CENTER mode: NORMAL, WIDE, PHANTOM
DELAY TIME : 20 ms (Fixed)
System/SC-EH50:
For (E)/(EP) area
Sound
processor:
SH-EH50,
Tuner/Amplifier:
SA-EH50,
Compact
disc
player:
SL-EH50,
Cassette
deck:
RS-EH60,
Front speakers: *! SB-EH60
For (GC) area
Sound
processor:
SH-EH50,
Tuner/Amplifier:
SA-EH50,
Compact
disc
player:
SL-EH50,
Cassette
deck:
RS-EH60,
Front speakers: ** SB-EH50, Center speaker: ** SB-PC60, Surround speakers: ** SB-PS60
Notes: >k1 ...Made in PAES
2 ...Made in MESA
ZA\AWARNING
This
service
information
is
designed
for
experienced
repair
technicians
only
and
is
not
designed
for
use
by
the
general
public.
It
does
not
contain
warnings
or
cautions
to
advise
non-technical
individuals
of
potential
dangers
in
attempting
to
service
a
product.
Products
powered
by
electricity
should
be
serviced
or
repaired
only
by
experienced
professional
technicians.
Any
attempt
to
service
or
repair
the
product
or
products
dealt
with
in
this
service
information
by
anyone
else
could
result
in
serious
injury
or
death.
T
J
e
6
©
1997
Matsushita
Electric
Industrial
Co.,
Ltd.
All rights reserved. Unauthorized copying
and distribution is a violation of law.

SH-EH50
@ Contents
Page
Page
LOCatOMiO COMMONS «cz: ice; cesses escesce ssessivencdsssztestseesecesseatssxceinahinertciseesvon 2 Printed Circuit Board Diagram ccsesiscesasecsncasesecaseveasevschessensecasavivesveeest 14
Changing the tONG sissssisccssseesdtescssesiutlecsdccatendoussavesstastevtenveadaxdewestcaxees 3,4 Type Illustration of IC's, Transistors and Capacitors ...........sccscssesesee 15
Enjoying sound with DOLBY PRO LOGIC [For (GC) area only]..... 5, 6 Wiring Connection Diagram
Enjoying with SURROUND or 3 STEREO [For (GC) area only] ......... il Terminal Function of IC's
Operation Checks and BloCK DiaQrainy siceccssscascsssnverseceveevcavieveevtevencensaceaves
Main Component Replacement Procedures .............:es0 8,9 Replacement Parts List (Electrical and Cabinet) ....
Te: Supply POWGr SOUICE is issicsscss:.ciissctacdsssy-csasesgeonesecesessnonesnenncsueiecoes 10 RESIStOFS ANG CAaPACIONS \. cscs cesessccsecveeveseacsavesvescsnsorssesssesstsssenvessssevess
SCHEMARNG: DIAG AIM ish seisecs sdees evesedeevsawvcensaseseageacansevieevssvenvesueveceses 11 ~13 Cabinet Parts: LOCAtiOn siscs:..sasassssccvsasesacsetsneciosstaystracctia rnin aaeeniaeaees
NOTE:
Refer to the service manual for Model No. SA-EH50 (ORDER No. AD9703053C8) for information on “Accessories”,
“Connections”, “Installation” and “Packaging”.
# Location of Controls
@ EQ SPACE on/flat button (EQ SPACE ON/FLAT)
@ Display mode select/demonstration button (DISP MODE/-DEMO)
@) Display
@ DOLBY PRO LOGIC indicators (SURROUND, 3 STEREO, NORMAL, WIDE, PHANTOM)
©) Multi control buttons (MULTI CONTROL, P , A, <4, W)
© Acoustic image EQ button (ACOUSTIC IMAGE EQ)
@ EQ SPACE preset/manual select button (PRESET/MANUAL)
DOLBY PRO LOGIC on/off button (DOLBY PRO LOGIC, OFF/ON)
@DOLBY PRO LOGIC mode select button (MODE) [ele eicekou a
@DOLBY PRO LOGIC test signal button (TEST) [le kicckua
@DOLBY PRO LOGIC center mode button (CENTER MODE) [io eicekoula

| SH-EH50
m@ Changing the Tone
To listen with augmented bass
WALT.)
Press V. BASS.
To cancel, press V. BASS once again.
You cannot record with the V. BASS effect.
“V. BASS” is only effective on sounds which can be heard through
the speakers or headphones.
Using the internal sound quality B
Press PRESET/MANUAL to select the desired mode.
Each time you press PRESET /MANUAL, EQ and SPACE modes will
be switched as follows.
HEAVY— CLEAR HALL MANUAL
ee ae ee |
GJHEAVY: Use toadd “punch” to rock and other music.
[2)CLEAR: Use to clarify the treble range of jazz, etc.
[3] HALL: Use to impart a deep bass and spread which will
make you feel as if you were in a large concert hall.
[4]MANUAL: Refer to the “Finer sound quality changes” section on
Page 4.
To cancel the EQ SPACE effect
Press EQ SPACE ON/FLAT to select “FLAT”.
Recordings cannot be made in the HALL, CLEAR, HEAVY or
MANUAL modes.
Recording during use of sound quality operation will cause the
“HALL”, “CLEAR”, “HEAVY” and “MANUAL” indicators to dis-
appear and light again when recording is completed.
PRESET/

SH-EH50
Middle register
Ltt WER
SS
SARE ee SL ee
FETE
t
f
¥
Using the acoustic image EQ
This function allows easy creation of sounds closer to what you
imagine.
The figure shows an example where the sound quality has been
adjusted to HEAVY level 2 and SHARP level 3.
il Press ACOUSTIC IMAGE EQ.
2 Press the A VW < > buttons to move the cursor
to the desired music image.
HEAVY (A): When a heavier sound is desired
LIGHT (¥): Whena lighter sound is desired
SOFT (<4): | Whena softer sound is desired
SHARP (>): Whena sharper sound is desired
To cancel the ACOUSTIC IMAGE EQ effect
Press EQ SPACE ON/FLAT to select “FLAT”.
Sounds can be made to fit a total of 36 images.
©The resulting adjustment is automatically stored in memory. When
the ACOUSTIC IMAGE EQ is pressed again, the image last selected
is automatically selected.
Finer sound quality changes
Finer sounds can be created by selecting MANUAL.
il Press PRESET/MANUAL to select MANUAL.
Press < > to select the desired register.
<4: Upper register
>: Lower register
EF} Press A V to adjust the register level.
A: Increasing the register level
V: Decreasing the register level
For your reference:
Upper register: includes pipes, strings, cymbals and triangles
@ Increasing the upper register: mellows pipes and strings, adds pre-
cision and glitter
© Decreasing the upper register: quiets music, rids music of its
“stretch”
Middle register: vocals (voice)
@ Increasing the middle register: gives strength and punch to music
brings voices forward, brightens
sound
© Decreasing the middle register: quiets music, pulls voices back,
softens intense sounds
Lower register: includes bass and drums
© Increasing the lower register: stabilizes heavy and low sounds,
swells low sounds
© Decreasing the lower register: decreases noise in lower sounds, re-
duces muffled sounds
©The resulting adjustment is automatically stored in memory. When
the MANUAL mode is selected again, the sound quality last se-
lected is automatically played back.
©The register can be manually adjusted at 5 individual points along
the 100 Hz~10 kHz frequency range.

| SH-EH50
a
Enjoying
Sound
with
eee
PRO
LOGIC
[For
(GC)
area
only]
By combining front, center and surround speakers, you can enjoy the
SURROUND mode which conveys a feeling of presence or the
3 STEREO mode which conveys a feeling of orientation.
Front Front
speaker (L) Center speaker speaker (R) ;
| SURROUND y
By reproducing the feeling of depth and movement of sound, video
software or compact discs recorded with Dolby Surround provide
the listener with the sensations of a movie theater.
To enjoy SURROUND, be sure to connect the surround speakers.
Surround Surround ! B
You can enjoy audio/video sources with clear sound, more presence
and enhanced orientation. 3 STEREO can be used with sources not
recorded in DOLBY SURROUND.
To enjoy 3 STEREO, be sure to connect the center speaker.
Front Front
speaker (L) Center speaker speaker (R)
Manufactured under license from Dolby Laboratories Licen-
sing Corporation.
DOLBY, the double-D symbol DO and “PRO LOGIC” are
trademarks of Dolby Laboratories Licensing Corporation.
Setting the center mode
For Dolby Pro Logic systems, center mode setting is necessary to play
Surround
Surround
he
back
bass
sounds
effectively.
Set
the
center
mode
in
accordance
with
speaker (L) speaker (R) | the size of your center speaker.
il Switch on the power.
2 Press DOLBY PRO LOGIC OFF/ON io select
ON.
Jk] Press MODE to select “SURROUND” or
“3 STEREO”.
Each time you press the button, the display will change as
follows:
SURROUND-3 STEREO
tS
4 Press CENTER MODE to select “NORMAL”
mode.
Each time you press the button, the display will change as
follows:
NORMAL WIDE->PHANTOM
SRE ae ee
“PHANTOM” will not be displayed when you select
“3 STEREO” in step Eq.
NORMAL:
When the center speaker is smaller than the front speakers
WIDE:
When the center speaker is the same size or larger than the front
speakers
PHANTOM:
When no center speaker is connected
STANDBY,
In the PHANTOM mode, the sound which would have been sent to
the center speaker will be divided equally between both the left and
right front speakers.

SH-EH50 |
OFF/ON
®
- CENTER +
Adjusting speaker output level
In order to reproduce the movement of the sound and its clear
orientation,
it
is
important
to
adjust
the
output
level
of
each
speaker.
Adjust output to the correct levels while listening to the test signal.
il
Press
DOLBY
PRO
LOGIC
OFF/ON
to
select
ON.
Press
MODE
ito
select
“SURROUND”
or
“3
STEREO”.
Each
time
you
press
the
button,
the
display
will
change
as
follows:
SURROUND->3
STEREO
|
El Press TEST to output a test signal.
The test signal is emitted in the following order:
For SURROUND mode
Front speaker (lefts Center speaker
Y
Surround speakers (left, right) Front speaker (right)
The
test
signal
is
not
emitted
from
the
center
speaker
when
the
center
mode
is
on
PHANTOM.
For 3 STEREO mode
Front speaker (left) Center speaker— Front speaker (right)
te}
Turn
VOLUME
to
set
the
volume
level
normally
used
for
enjoying
the
source.
5
Press
CENTER
(—)
or
(+)
or
SURROUND
(-—)
or
(+)
on
the
remote
control
to
adjust
the
output
level
balance.
Adjust
the
output
level
of
each
speaker
from
the
listening
posi-
tion
until
they
are
all
identical.
Output
levels
can
be
varied
within
a
range
of
+12
dB
with
front
speaker
output
level
serving
as
the
zero
point.
©The
test
signal
is
output
only
by
the
speaker
you
are
now
adjusting
and
does
not
repeat
the
sequence
until
adjustments
are
complete.
@Remember
you
cannot
adjust
the
output
level
of
the
surround
speakers
if
you
selected
the
3
STEREO
mode
in
step
SI
To stop the test signal:
Press TEST.

SH-EH50
m@
Enjoying
with
SURROUND
or
3
STEREO
[For
(GC)
area
only]
. Enjoying with SURROUND or 3 STEREO
Before trying anything, have you set the center mode and adjusted
speaker output level?
When viewing a video, turn on the power supply for the TV and set
the TV to video mode.
il
Press
INPUT
SELECTOR
to
select
the
desired
external
source.
Each
time
you
press
this
button,
sound
sources
will
be
switched
as follows.
TUNER —> CD — TAPE
t 1
VDP(AUX) << VCR(EXT)
These indications correspond to terminals on the rear panel of
the sound processor or tuner/amplifier. Switch the displayed
indication to the source you want to use.
Press DOLBY PRO LOGIC OFF/ON to select
ON.
IN)
Press MODE to select “SURROUND” or
“3 STEREO”.
eS
Start the desired source.
To operate external sources, refer to the operating instructions
provided with the specific unit.
S
When using SURROUND, use software recorded in Dolby Surround.
To turn off the DOLBY PRO LOGIC systems:
Press DOLBY PRO LOGIC OFF/ON to select “OFF”.
You cannot record acoustical effects produced in the SURROUND
and 3 STEREO modes.

SH-EH50 |
@ Operation Checks and Main Component Replacement Procedures
\\(oyg=8 1. This section describes procedures for checking the operation of the major printed circuit
boards and replacing the main components.
2. For reassembly after operation checks or replacement, reverse the respective procedures.
Special reassembly procedures are described only when required.
1. Checking for the IN/OUT terminal P.C.B.
Remove the top cabinet.
¢ Check the IN/OUT terminal P.C.B. as shown below.
Connect the lead wire.
Top cabinet
IN/OUT terminal P.C.B.
Step 6
Release the 3 claws, and
then remove the IN/OUT
terminal P.C.B..

| SH-EH50 _
2. Checking for the FL P.C.B.
¢
Follow
the
~
of
the
item
1
in
checking
procedure
for
each
P.C.B.
on
page
8.
Release the 6 claws, and then
remove the front panel ass’y.
Release
the
5
claws,
and
then
¢
Check
the
FL
P.C.B.
as
shown
below.
remove
the
FL
P.C.B..
Unsolder the shield plate terminals.
(6 points)

SH-EH50 |
m@ To Supply Power Source
This
unit
SH-EH50
is
designed
to
operate
on
power
supplied
from
the
Tuner/Amplifier
SA-EH50.
When
operating
the
unit
SH-EH50
alone
for
testing
and
servicing,
without
having
power
supplied
from
the
Tuner/Amplifier
SA-EH50,
use
the following
method.
Power Supply to Video Selector Circuit
1. Short the section between J124 and R753:
2. Short the section J306, J307, J305 and J302 with each other. (Point EY)
3.
Short
the
section
between
J126
and
17
pin
of
the
connector
JK101.
(Point
[)
4. Short the section between J125 and J101. (Point [@)
5.
Apply
+5
V
DC
power
to
the
section
between
J125
and
(+)
foil
side
of
C104.
6. Connect the DC power supply as shown below.
© +12 V terminal of the DC Power Supply connect to Point fq.
© GND terminal of the DC Power Supply connect to Point EN.
®@—12 V terminal of the DC Power Supply connect to Point EJ.
To Check Signal
1. Input the audio signal and confirm in to be outputted from
the terminal.
az INPUT OUTPUT
VCR-Lch terminal
. _VCR-Rch terminal
DC Power Supply
Short Point E} Short EN
Short Point EY
Short Point
Short EJ
JK101-17 pin
DC Power Supply
——J302 “>
J307 seine |
= J305 C104+
J125
Short
ka
D101
J125
J124 +5V
a |
Short
=40=