Technics SH-AC500D User manual

ORDER NO. MD9905090C2
Service Manual
Digital Surround Processor Processor
DIGITAL
D[ecsvsunouns]
DUfor]
Prey
H-AC500D
Colour
(WK) aacan Black Type
Area
Guten)
wea
|
cour
Manufactured under license from Dolby Laboratories. “DOLBY”, “Pro Logic”
and the double-D symbol are trademarks of Dolby Laboratories. Confidential
Unpublished Works. © 1992-1997 Dolby Laboratories, Inc. All rights reserved.
DTS Inc. USP No. 5, 451, 942.
Specifications
AUDIO Total harmonic distortion
Frequency
response
FRONT
L/R
(1
kHz,
0
dB,
PCM)
0.007%
FRONT
L/R,
CENTER,
SURROUND
L/R
(LARGE)
Dynamic
range
96
dB
20 Hz-20 kHz,+1dB S/N (IHF-A) 100 dB
Outlet
voltage/Impedance
2
V
(at0
dB)/1
kQ
~~
Load
impedance
More
than
10
kQ
Input impedance
LINE 22kQ H GENERAL
COAXIAL
75
kQ
Power
supply
AC
230
-
240
V,
50
Hz
Delay
time
Power
consumption
18W
DOLBY
DIGITAL
Dimensions
(W
X H X
D)
430
X
69.4
X
301.4
mm
CENTER
O0-5ms_
Weight
2.6
kg
SURROUND L/R 0-15 ms
DOLBY PRO LOGIC Notes :
SURROUND L/R 15-30ms _ Specifications are subject to change without notice.
Weight and dimensions are approximate.
A, WARNING
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 producis dealt with in this service information by anyone else could result in serious injury or death.
© 1999 Matsushita Electronics (S) Pte. Lid.
= go All rights reserved. Unauthorized copying
ec nics and distribution is a violation of law.

SH-AC500D |
i Contents
PAGE
©, ACCESSORIES vicsicciwecetiinesesshastecdeaadear tact stieenaetenaee 2
e CAUTIONS FOR AC MAINS LEAD........... eee 3
e FRONT PANEL CONTROLS ............cccccceeeecccceeeeeeeeeees 4
© CONNECTIONS uuu... eceececeeecceccecceceececeeseecaaeseeeecesenee 5~7
« (SPEAKER SET TIN Giwtecrseeccesthexxted oc ecrtsaciesnedis aveets 8
e SPEAKER OUTPUT ADJUSTMENTS ...........c eee 9~10
e DELAY TIME ADJUSTMENTS .............cccccceeeseeeseeeeeeee 1
e ENJOYING SOUND IN A VARIETY OF
REPRODUCTION MODES. .........ccccceeceeeeeeseeeeeeeeeeeeaeee 12~13
© OTHER FUNCTIONS 2.00.0... cece csseseececcnseseeseseeneeneeeee 14
e REMOTE CONTROL QUICK REFERENCE .............. 15
© OPERATION CHECKS .........ccccccceeceneeseccssecensesereenseenee 16~17
Mi Accessories
e TERMINAL FUNCTION OF IC’S
e TYPE ILLUSTRATION OF IC’S,
TRANSISTORS AND DIODES
e BLOCK DIAGRAM
e SCHEMATIC DIAGRAM
e PRINTED CIRCUIT BOARD
e CABINET PARTS LOCATION
e REPLACEMENT PARTS LIST
e RESISTORS & CAPACITORS
e PACKING MATERIALS & ACCESSORIES. ................
© PACKAGING uu... eee
AC power supply cord
for United Kingdom
Optical-fiber cable
;
(eal.
ties
==
ES
=)
AC power supply cord
for Others
Remote control unit
Monaural connection cables
Batteries
Stereo connection cables

@ Caution for AC Mains Lead
(For “EB” area code model only.)
For your safety, please read the following text carefully.
This appliance is supplied with a moulded three pin mains plug
for your safety and convenience.
A 5-ampere fuse is fitted in this plug.
Should the fuse need to be replaced please ensure that the
replacement fuse has a rating of 5-ampere and that itis approved
by ASTA or BSI to BS1362.
Check for the ASTA mark <> or the BSI mark @ on the body
of the fuse.
If the plug contains a removable fuse cover you must ensure that
it is refitted when the fuse is replaced.
If you lose the fuse cover, the plug must not be used until a
replacement cover is obtained.
A replacement fuse cover can be purchased from your local
dealer.
CAUTION !
IF THE FITTED MOULDED PLUG IS
UNSUITABLE FOR THE SOCKET OUTLET IN
YOUR HOME THEN THE FUSE SHOULD BE
REMOVED AND THE PLUG CUT OFF AND
DISPOSED OFF SAFELY.
THERE IS A DANGER OF SEVERE
ELECTRICAL SHOCK IF THE CUT OFF PLUG
IS INSERTED INTO ANY 13-AMPERE SOCKET.
If a new plug is to be fitted, please observe the wiring code as
shown below.
If in any doubt please consult a qualified electrician.
IMPORTANT
The wires in this mains lead are coloured in accordance with the
following code:
Blue: Neutral
Brown: Live
As these colours may not correspond with the coloured markings
identifying the terminals in your plug, proceed as follows:
The wire which is coloured Blue must be connected to the terminal
which is marked with the letter N or coloured Black or Blue.
The wire which is coloured Brown must be connected to the
terminal which is marked with the letter L or coloured Brown or
Red.
WARNING: DO NOT CONNECT EITHER WIRE TO
THE EARTH TERMINAL WHICH IS MARKED WITH
THE LETTER E, BY THE EARTH SYMBOL — OR
COLOURED GREEN OR GREEN/YELLOW.
THIS PLUG IS NOT WATERPROOF—KEEP DRY.
SH-AC500D
Before use
Remove the connector cover.
How to replace the fuse
The location of the fuse differ according to the type of AC mains
plug (figures A and B). Confirm the AC mains plug fitted and follow
the instructions below.
Illustrations may differ from actual AC mains plug.
1. Open the fuse cover with a screwdriver.
Figure A 7
Figure B
2. Replace the fuse and close or attach the fuse
cover.
Figure A
Fuse
(5 ampere)
OS
Figure B
Fuse
(5 ampere)

SH-AC5O0D |
i Front panel controls
ers eegate vere ni
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pet anR eRe AOS NEEIAD
oieitaL
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Sb POS PEO DE AOE TRAVIAN
SYNE PRL NMA SRI 2 PSSA AS SRNR ILO UUO MTN ERA HORII
Control section Zl
@ Unit on/off button( a © = cbf)
and remote standby indicator (¢/)) ,
Use this button to turn the unit on and off.
BZ (off): The unit is in standby mode.
-=. (on): The unit is on. The unit can be turned on and off with
the remote control. When the unit is turned off with the
remote control it is in remote standby and the indicator
lights.
The unit is still using a smali amount of power in the standby and
remote standby conditions. Standby uses less power.
When the unit is connected to the AC mains lead, this indicator
lights up in standby mode and goes out when the unit is turned
on.
@ Input select buttons/indicators
(DIGITAL 1, DIGITAL 2, DIGITAL 3, LINE)
@ Surround mode button (SURROUND)
@ Digital Theater Systems mode button (DTS)
© Stereo mode button (STEREO)
© Volume control (VOLUME)
Main unit oni
@ Speaker setting buttons
(CHANNEL/SET, SELECTOR)
@® Dynamic range compression button
(DR COMP)
@ Balance control (L, R)
(© Output level setting buttons
(TEST, LEVEL, -, +)
@ Delay time setting buttons (DELAY, -, +)
(2 Dimmer button (DIMMER)
(3 Muting button (MUTING)
| Display section E]
(@ Surround format indicators
(OU DIGITAL, E233, OO PRO LOGIC)
@ Display
(® Dynamic range compression indicator
(DR COMP)
@ Speaker indicators
Light in accordance with the speaker setting, and each of the
indicators corresponding with the speaker concerned flashes
when;
e the type or presence of that speaker is set,
e the test signal is output from that speaker,
e the output level or delay time of that speaker is adjusted.
18 Signal format indicators (LS, C, RS, L, R, S, LFE)
These indicators light up to indicate the Dolby Digital or DTS
input signal format.
LS: Surround speaker (left)
C: Center speaker
RS: Surround speaker (right)
L: Front speaker (left)
R: Front speaker (right)
“S" represents the mono surround and “LFE” (Low Frequency
Effect) is a channel for the deep-bass effect in the low frequency
range.

SH-AC500D
Hi Connections
Before proceeding with the connections, ensure that the power to S : bi
all the units has been turned off. tereo connection cable
Connect the AC power supply cord only after all other cables and aU is = >on.
cords are connected. Red (R)
Connection to a receiver or amplifier
Connection to a receiver (or amplifier} with 6 channel discrete input terminals |
Sa efs00)9)
DIGITAL(O0 DIGITAL/DTS/PCM)
D© ©,O}
[li © (o ©) POO
DIGITAL 1 OIGITAL2 = DIGITAL 3. FRONT SUBWOOFER
SURROUND
Stereo connection cables (included)
os Monaural connection cables (included)
Receiver or amplifier
(This illustration is an example of connection from this unit to a model
SA-AX720 receiver.)
DV
pee
DVD/6CH
=
SUBWOOFER SURROUND
R
foo)
(oO)
0 © eal
(XO)
10)
10)
10) ©00 SEQ Oo SEQ Oo
For your reference:
The position and labeling of terminals differs with the
receiver (or amplifier). The “DVD/DVD 6 CH” terminal
in the above illustration, for example, is often labeled
as “FRONT (L, R).”

SH-ACSOOD |
| Connections for outputting the 6 channel signals through 3 power amplifiers ]
This illustration is an example of connection from this unit to a stereo control amplifier of model SU-C1000 and three stereo power amplifiers of
model SE-A1000.
SH-ACS00D
DIGITAL(Q9 DIGITAL/DTS/PCM)
JO Dg ©
DIGITA, QIGITAL2 — DIGITAL
|LBWOOFER
LINE
‘SURROUND
IN
Stereo connection cable
(not inculuded)
Stereo connection cables
(inculuded)
Control amplifier (not included) PREOUT
oaao oooo0.0 0 0 O
o 00 Fj 00 Co
er
Monaural connection
cables (included)
For your reference:
If three integrated amplifiers are connected
instead of the power amplifiers, it is not
necessary to connect a stereo control
amplifier.
Connect
the
output
terminals
of
this
Stereo
power
Stereo power
unit to the See input terminals of the amplifier for aia. ai
integrated amplifiers. center speaker :
INPUT INPUT (got included INPUT speakers
or LINE IN or LINE IN ) or LINEIN | (not included)
Stereo power amplifier
for front (L, R) speakers
(not included)
WW 1777 WA 1472
1 000 ome)
——
WW 1777
WW 1477
WA 17747 WW 1777
CI 600 one) jm oxon@) [ome)
CS ___ a Se
Front speaker
(not included)
INPUT or LINE IN
Front speaker
(not included)
Subwoofer built-in Center speaker
amplifier (not included) (not included)
Surround speaker (ny,
(not included)
Surround speaker
(not included)

| SH-AC500D
Connections to audio-visual equipment and the AC power cord
Sak Nesayols)
Pata mDaTALDTEFCM 1G) 6)
CENT
PO© 20
FRONT SUBWOOFER
SURROUND j} FRONT
“6|O*_.©
Oa © Oa
SUBWOOFER SURROUND
Optical-fiber Optical-fiber cable
cable (not included)
(included)
Coaxial cable
(not included)
DIGITAL OUT
DVD player, etc. (not included)
Connection for optical-fiber cable
Dust-protection cap
© Do not bend the optical-fiber cable at a sharp angle.
@ If the digital optical connector is not going to be used, be sure to
attach the dust-protection cap to prevent exposure to dust.
“DIGITAL 1” terminals 8
Disconnect the coaxial cable from the DIGITAL 1 terminal when
using an optical fiber cable. Only the coaxial cable is recognized if
both types are connected.
Coaxial cable (not included)
DIGITAL OUT
AC power supply cord (included)
4) Household AC outlet
: (AC 120 V/60 Hz)
DIGITAL OUT
Other digital playback sources (laser disc players, etc.)
“LINE IN” terminals
(Only if a control amplitier has not been connected.)
You can connect a set-top box tuner for digital television or similar
decoder.
If “LINE” is selected with the input selector on this unit, the signals
received through these terminals are output as they are without
passing through any sound control circuits (i.e. no volume or other
sound adjustments can be made with this unit.)
@ Dolby Digital RF (radio frequency) signals cannot be decoded with
this unit even if a unit that has Dolby Digital RF output terminals is
connected to this unit.
Turn off the power to this unit if unusual hissing or beat
sounds are heard while listening to FM, AM, or television
broadcasts.

SH-AC500D
li Speaker setting
Set the types and presence of the speakers before enjoying the
sound by reproducing the input source.
Before proceeding:
Check the frequency range of each speaker to be used. Consider
speakers capable of playing back low frequency sounds (below
around
100
Hz)
as
LARGE.
Consider
speakers
not
capable
of
playing back low frequency sounds as SMALL.
Press POWER.
owaon
Press
CHANNEL/SET,
and
select
the
channel
for
which
the
speaker
is
to
be
set.
becoescucccavceconvesoen
wepececococvevecerossgsn0e
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Bevecseosvocensceace
Each
time
the
button
is
pressed,
the
channel
display
is
SPEAKER
SETTING
switched
in
the
listed
order.
CHANNEUSET
FRONT:
Front
speakers
CENTER:
Center
speaker
SURROUND: Surround speaker SUB-WFR: Subwoofer
COMPLETE: Select this when you have completed the
settings.
The selected channel is shown on the display for approx. 2
seconds. The current setting for that channel is then shown
as a flashing display. The indicator corresponding to the
selected speaker also continues to flash.
Press SELECTOR, and set the type (LARGE,
SMALL) and presence (YES, NO or NONE) of
the speaker.
Each time the button is pressed, the display is switched in the
listed order.
LARGE: select if the speaker can produce low frequency
sounds,
SMALL: select if the speaker cannot produce low frequency
sounds,
NONE: select if you are not using a center speaker or
surround speakers,
YES: select if you are using a subwoofer,
NO: select if you are not using a subwoofer.
The sound for speaker channels that are set to “NONE” or
“NO” are output from the front speakers. DTS format
software, however, depends upon all channels being
operable, and so the sound for speakers not connected is not
heard at all, no matter what settings are made.
SELECTOR
Repeat steps 2 and 3 to complete the settings
\
for
all
the
channels.
Press CHANNEL/SET to select “COMPLETE”.
(FRONT)|
LARGE
SMALL
The
settings
are
now
entered
into
the
unit’s
memory.
The
display goes out after about 2 seconds and the previous
(CENTER) | LARGE NONE
display reappears.
The speaker indicators light up unless “NONE” or “NO” has
been selected for the corresponding channel.
(SURROUND) [LARGE |—-[SMALL}—-[ NONE ]} [Ee
If no buttons are pressed for approx. 10 seconds during the setting
process, ail previous settings are canceled, the setting mode is
SUB-WER
released,
and
the
original
display
is
restored.
(
)
YES
NO
Begin
the
setting
process
again
if
this
occurs.
For your reference:
The setting remains as it is until changed by the above procedure,
even after the power has been turned off.

SH-AC500D
li Speaker output adjustments
Set the initial output level first, then proceed to adjust the output
level for each speaker channel.
| Setting the initial volume level
When this unit is connected to a receiver (or amplifier)
that has 6 channel! discrete input terminals:
Set the volume level to 0 dB using this unit’s
VOLUME control.
Set the volume control of the receiver (or
amplifier) to the position normally used for
yf . #4 enjoying the source.
If the test signal, described below in “Speaker output adjustment”, is
too soft, adjust the volume on the receiver (or amplifier).
If the input level to the receiver (or amplifier) is too loud, lower the
volume level using this unit’s VOLUME control.
When this unit is connected to three standard stereo
amplifiers:
Set the volume level to around -48 dB using
this unit’s VOLUME control. Ej
(If this unit is connected to three integrated amplifiers:)
owen Set the volume control of the integrated
amplifiers to the position normally used for
enjoying the source.
If the test signal, described below in “Speaker output adjustment’, is
too soft or too loud, adjust the volume on this unit.
Adjust the output level of each speaker G@intatkecntmlmen
Use the test signal to adjust the output level of the center speaker,
surround speakers and subwoofer.
MUTING
CO) VOLUME CO Note]
ae | ae If the output from the front speakers is unbalanced, make balance
adjustments on the receiver or amplifier before continuing with the
following. (Refer to the instruction manual of the component.)
If the receiver or amplifier cannot be used to make balance
adjustments, they can be made on this unit.
Press SURROUND to select the surround
mode.
“SURROUND?” appears on the display.
(Continued on next page)
SURROUND
‘

SH-AC500D
BALANCE
DIGITAL? DIGITAL2 DIGITA3 LINE
= VOLUME +
Center position
Press TEST to output the test signal.
“TEST” appears on the display, and the speaker indicator
corresponding to the speaker whose outputting sound
flashes.
The test signal is automatically output from each speaker for
2 seconds in the following sequence:
c c>R-> Boba ey
L: Front speaker (left)
C: Center speaker
R: Front speaker (right)
RS: Surround speaker (right)
LS: Surround speaker (left)
SW: Subwoofer
(Speakers for which NONE or NO has been set are skipped.)
lf the left and right front speaker balance is poor, do not
proceed with the next step until balance has been improved
with the procedure described below (4).
Press LEVEL to select the speaker channel to
adjust.
The output level appears on the display, and the speaker
indicator for the selected speaker flashes.
Each time the button is subsequently pressed, the speaker
whose level is to be set is selected in the listed sequence.
(Speakers for which NONE or NO has been set are skipped.)
6! Press LEVEL [-] or [+] to adjust the output
level.
Channels C, RS, LS, and SW can be adjusted between -12
dB and +12 dB. Set them so that the output from each
channel appears to be the same as that from the front
speakers.
Repeat steps 5 and 6 to adjust the output of
each channel to approximately the same
apparent level.
To stop the test signal
Press TEST.
Using this unit to adjust the balance of the left and right
front speakers ZI
Make the adjustments while listening to the test signa! put’ out in
step 4 above.
Press BALANCE [L] or [R] on the remote control
to adjust the level balance.
The left/right balance appears on the display.
Each time the button is subsequently pressed, the output level of
the front speaker opposite to the button pressed is decreased. (i.e.
when the L button is pressed, the output level of the R speaker is
decreased.)
The original display is restored if a button isn’t pressed for 4 or more
seconds.
The balance of the surround speakers cannot be adjusted using the
BALANCE buttons.
== 10:

i Delay time adjustments
DIGITAL? LINE
S rn
Cotto)
SURROUND
Center
speaker
Front
Front
speaker
5
speaker
Surround
speaker
Surround
speaker
= 44 —
SH-AC500D
By adjusting the delay time, the difference in the distance from the
viewing and listening position to the front speakers and the distance
to the center speaker and surround speakers can be offset and
made equal. This achieves better sound localization and makes a
more life-like reproduction of the sound field possible.
Remote control only
Press SURROUND to select the surround
mode.
“SURROUND?” appears on the display.
Press DELAY to select the channel to be
adjusted.
Each time the button is subsequently pressed, the channel
whose delay time is to be set is selected alternately:
C (Center speaker) «— S (Surround speakers)
For each channel, the delay time is displayed, and the
speaker indicator for the corresponding speaker flashes.
The display is restored if a button isn’t pressed for 4 or more
seconds.
Speakers for which NONE has been set are skipped.
Press [-] or [+] to set the delay time.
When the button is pressed, the current delay time is
displayed. Each time the button is pressed, the delay time will
change. The delay time increments are different depending
on the speaker as follows.
Speaker Available delay time setting (ms)
Center 0, 1, 2, 3, 4,5
Surround 0,5, 10, 15
Please note the following if delay time is adjusted while playing
back a source:
Adjustment is not possible if the source is DTS format.
While the DM PRO LOGIC indicator is alight, the center channel
cannot be adjusted and 15 ms are added to the delay times listed
for the surround channel when displayed.
To calculate the delay time EN
D:: Distance from front speaker
Dz: Distance from surround speaker
Ds: Distance from center speaker
Setting the center channel delay time:
Set to 0 ms
{f Ds less than Di Increase 1 ms for every 30 cm (1 feet) of
difference between D: and Ds
Setting the surround channel delay time:
If D1 is equal to or Set to 0 ms
tess than Dz
P Start at 0 ms and increase by 5 ms for
Mile Steee isan every 1.5 m (5 feet) of difference
between D: and Dz
If Di is equal to or
less than Ds

SH-AC500D |
li Enjoying sound in a variety of reproduction modes
INPUT SELECTOR
° ° °
DIGITAL 1] DIGITAL 2} DIGITAL 3
SURROUND
This unit enables sound to be enjoyed in three reproduction modes
- SURROUND, DTS and STEREO.
Press POWER.
Turn on the power to the other AV components as well.
Press one of the input select buttons to
select the input source.
The indicator above the pressed bution now lights.
DIGITAL 1: Selects the source connected to the DIGITAL 1
terminal. The unit automatically recognizes
whether the source is connected through the
optical fiber cable or the coaxial cable.
lf both types are connected at the same time,
only the coaxial cable is recognized. Disconnect
the coaxial cable if the external unit is connected
with the optical fiber cable.
DIGITAL 2: Selects the source connected to this terminal.
DIGITAL 3: Selects the source connected to this terminal.
LINE: Selects the source connected to the LINE terminal. If a
control amp has been connected to the LINE terminal,
select the input source on it as well.
When DIGITAL 1, 2 or 3 has been selected:
The reproduction modes in step 3 can be selected.
When LINE has been selected:
The analog sound signals input through LINE IN terminals
are directy output to the left and right front speakers via the
connected component. “THROUGH” appears on the display.
Only the POWER button and select buttons function when
LINE has been selected.
Press SURROUND, DTS or STEREO to select
the reproduction mode.
The selected reproduction mode appears on the display
(= see the previous page for descriptions of the modes.)
(When this unit is connected to a receiver (or amplifier) that 6
channel discrete input terminais:)
Set the receiver (or amplifier) to the 6 channel
discrete input mode.
If this unit is connected to three integrated amplifiers, set the
input selector on the amplifiers to the connected input
terminal such as the “AUX” terminals.
(Refer to the instruction manuals of the components.)
(Continued on next page)
ae,

SH-AC500D
Start playing the sound source.
The surround indicators
@) DO DIGITAL: Lights if the source is Dolby Digital Format.
© GZS: Lights if the source is DTS format.
© OO PROLOGIC: Lights when Dolby Surround parts of
Dolby Digital format software are
played back, or when playing audio
CDs in the SURROUND mode.
eOnly Dolby Digital, DTS or PCM signals > can be
(a)
[
oa
DIGITAL
S
‘
reproduced.
The
digital
input
signal
of
sampling
frequencies
96
kHz
and
other
signal
formats
such
as
MPEG
cannnot
be
reproduced
on this unit.
fats]
+
j
tei
eWhen
playback
is
started,
the
sound
may
be
cut
or
i
i
interrupted
before
the
input
source
is
confirmed
as
Dolby
Digital or DTS.
Gd viata
* PCM signal: This refers to the recording format of signals
(44.1 kHz, linear 16 bits) used for audio CDs
[PRO Loic
6! Adjust the volume.
Set the volume on the receiver (or amplifier) and this unit to
the initial level. Any subsequent volume adjustments
VOLUME should be done as follows.
[A (When this unit is connected to a receiver (or amplifier)
that has 6 channel discrete input terminals:)
Adjust the volume using the volume
\ y
DOWN
control
on
the
receiver
(or
amplifier).
If
input
to
the
receiver
(or
amplifier)
is
excessive,
reduce
the
volume
on
this
unit
slightly.
‘B| (When this unit is connected to three standard stereo
amplifiers or three integrated amplifiers:)
Adjust the volume using this unit’s
VOLUME control.
To adjust the volume of the components connected to the
stereo control amplifier, use the volume control on the
stereo control amplifier.
After use
Reduce the volume on the component you are using to contro! the
volume (the receiver, amplifier or this unit) to the minimum level,
then turn off the power to this unit and the other components.
as 43

SH-AC500D |
@ Other functions
DIGITAL! OIGITAL2 DIGITAL3 LINE
SURROUND DTS. STEREO
OR COMP:
BALANCE
Oc
lS SOO
DELAY — +
COCO
f=} MUTING Ca
=e a
DR COMP
Dynamic range compression indicator
Gd odiaitAaL
MUTING
DIMMER
Setting the midnight mode
(dynamic range compression)
“Dynamic range compression” (DR COMP) is a function for
compressing the dynamic range (reproduction level range) of audio
signals. It is used for viewing movie software late at night or at other
times when high volume levels are not desirable.
This function only works with DR COMP compatible Dolby Digital
format software.
Remote control onl
Press DR COMP. ZI
The “DR COMP?” indicator lights.
When the button is pressed again, the function is released, and the
indicator goes off.
For your reference:
When DR COMP is on, scenes that already have a low sound level
will be heard as they are. When scenes that are loud occur, the
function acts to reduce the peak level.
The sound field will remain intact even if DR COMP is functioning.
Muting the sound temporarily oS
Remote control onl
Press MUTING. &
During muting, the message “MUTING ON NOW” scrolls across the
display.
When the button is pressed again, the original volume level is
restored. When the unit’s power is switched off, muting is canceled.
Selecting the display panel brightness ee
Remote control only.
Press DIMMER.
The display panel is dimmed.
When the button is pressed again, or when the unit’s power is
switched off, the original brightness is restored.
= fq

- +
= VOLUME +
ee,
DIGITAL) DIGITAL? DIGITAL3 LINE
SURROUNC DTS.
DELAY = =
- VOLUME = +
a
li Remote control quick reference
SH-AC500D
Functions which are also available from the main unit
To turn the unit ON/OFF
Selecting the input source
DIGITAL 1 DIGITAL2 DIGITAL3 LINE
oS (ah Ge Gh
Selecting the SURROUND reproduction
mode
SURROUND
-+———
Selecting the DTS reproduction mode
fee
Selecting the STEREO reproduction
mode
Adjusting the volume
To turn on the midnight mode
Adjusting the volume balance between
the left and right front speakers
STEREO
Functions which are only available from the remote control
DR COMP
BALANCE
L R
JC)
Outputting the test signal to adjust the
output level of each speaker
Selecting the speaker channel and
adjusting its output level
C9
Selecting the speaker channel and
adjusting its delay time
DELAY
Muting the sound temporarily
——
MUTING
Selecting the display pane! brightness
a
DIMMER

SH-ACS500D |
li Operation Checks
"ATTENTION SERVICER" Some chassis components may have sharp edges. Be careful when disassembling and servicing.
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.
3. Select items from the following index when checks or replacement are required.
° Contents page
e Checking Procedure For Each Major P.C.B. .....cssssccssssscsseeceeseesseeesseeeeesoeseneneesenseoesesssoueneuseneerssenesenesneeesnenereeas 16~17
@ Checking Procedure For Each Major P.C.B.
1. Checking of the Control, Display, Volume and Power Switch P.C.B.
Remove the top cabinet.
Display P.C.B.
(Solder Side) Control P.C.B.
Volume P.C.B.
(Solder
Side)
(Solder
Side)
Claw
® Power Switch P.C.B.
(Solder Side)
Release the two rear claw
and pull out the back panel (3) mm> ® fim b
[SNE2129-1] [XTBS3+8JFZ1]
(Black) (Black)
es FG

SH-AC500D
2. Checking of the AC-3 Module Unit, Display, Sub-Transformer,
; ivvay) [XTBS3+8JFZ1]
Digital
Input
and
Main
P.C.B.
Lb
(Black)
[XTB3+20JFZ]
(Farm o 2
Sub-Transformer P.C.B.
(Component side)
Flip over the Main PC.B.
following the arrow direction.
Main P.C.B.
(Component side)
Main P.C.B.
(Solder side)
Digital Input P.C.B.
(Solder side)
AC-3 Module Unit P.C.B.
(Solder side)
Sub-Transformer P.C.B.
(Solder side)
Remove the shield from
AC-3 Module Unit P.C.B.
ry ee

SH-AC500D |
@ Terminal Functions Of ICs
e 1C901 (M38B53M4057F) System Microprocessor
. Mark VO Function hs Mark vo Function
1 XCS O | Key Input 1 ~ 2 41~56| SEG1~SEG16 | O | FL digit signal output
2 SK O | Thermal/Over load input 1 57 INIT | | Diode input initial settings
3 DI O | Key Input 4 58 - | | Volume control output (Down)
4 DO | | Thermal/Over load input 2 59 PDN O | Volume control output (Up)
5~6 | STB1~STB2 | O | Stereo signal detect terminal 60 OVLERR | | REC Mute control
7~8 RA~RB | | Wake up timer LED 61 FRQO | | Serial data signal
9 -- |_| Control of RDS IC (ST) stereo signal 62 FRQ1 | | Power limitter control output
10 RESET | | Remote control terminal 63 AC3 |_| Tuner control (CE) chip enable signal
41 CK O | Reset detect terminal 64 AUDIO |_| Selector/Tuner (CK) clock signal
12 DATA O | Control of RDS IC (Ck) clock signal 65 CCS O | Selector/Tuner (DT) data signal
13 vss — | Control of RDS IC (DT) data signal 66 CCLK O | Selector control terminal
14 XIN -- | GND terminal 67 CDIN O | MMD control terminal
15 XOUT -- | Crystal oscillator terminal ( 4 MHz ) 68 CDOUT |_| Surround control (CK) clock signal
16 VDD/VCC -- | Crystal oscillator terminal (4 MHz ) 69 ss O | Surround control (DT) data signal
17~18| DIGITAL1~2 | O | LED driver IC (DT) data signal 70 SCK O | Surround control (CE) chip enable signal
19 LINE O | SFC mode encoder input 1 71 MOSI O | GND for A-D converter
20 STANDBY | O | SFC mode encoder input 2 72 MISO O | Reference voltage for A-D converter
21 | POWERSW | | | Selector encoder for input 1 73 AVSS — | SD signal detect input
22 REMOTE | | Blackout detection terminal 74 VREF — | Encoder of surround mode selector input1
23 HOLD | | Selector encoder for input 2 75 MRESET O | Help LED control output
24 POWER O | VCR2 control input 76 IFCD |_| Encoder of surround mode selector input2
25~27| A4053A~C | O | 6ch swcontrol output (ST) 77 TCS O | Video selector control output A
28 VEE -- | Power supply for FL driver 78 TRST O | Video selector control output B
29~30| MUTEA/S | O | Speaker B control output 79 KEY1 A/D| Key input 1
31~40| DIG10~DIG1 | O | Muting control output 80 KEY2 A/D| Key input 2
— 42 —

@
Type
Illustration
of
IC's,
Transistors
and
Diodes
SH-AC500D
a
= is —
M38B53M4057F
MX23C4000MC1
NJM4580DD
BR93LC46
TC9212P
TC9162AN
CS4926-CL
TC4052BP
CS4226-KQ
5
8
4
1
|
TC74VHC574FL
TC7SHU04F85L
NJM2060D
TC74VHC244FL
1
20
l
2SD1915FTA
2SD592AQSTA
2SA933SSTA
SLR325VCT31
RVD1SS133TA
LN846RPH
2SD1450RSTTA
2SA992FEPTA
2SC1740SSTA
2SB621AQSTA
RVTDTA114YST
RVTDTC114YST
é
Cathode
Anode
Anode
A
Cathode
Cathode
Ande
‘Os
‘
E
a
Cc
B
Bice
RL1N4003N02
MTZJ27DTA
MTZJ13BTA
ca
ca
MTZJ3R9ATA
cathese
Cathode
MTZJ4R7BTA
r
:
A
MTZJ6R2ATA
MTZJ6R2CTA
=
MEE
Anode

SH-ACS500D |
I Wiring Connection Diagram
[fe] SuB-TRANSFORMER P.C.B.
POWER
SWITCH
P.C.B.
D F pre .
[eeneal TRANSFORMER
COMPONENT SIDE
[Pp] CONTROL P.c.B.
COMPONENT
SIDE
PT1
POWER
TRANSFORMER
ZY main P.c.s. | sunnouno un
|| eden Be
: FRONT L/R
“|
w901
JK402
SURROUND L/R
[LINE IN | IN
CENTER/
| SUBWOOFER
ws04 JK401
1
CN902 CNg901 W301 | FRONT UR
COMPONENT SIDE
COMPONENT
SIDE
FE} DisPLay p.c.B.
DIGITAL INPUT P.C.B.
ai DIGITAL3
+ DIGITAL2
[LINE IN] IN
ee |
oi
fe dl
VOLUME P.C.B. CN1002 —- CN1001
COMPONENT SIDE
IF] Ac-3 MODULE UNIT P.C.B.
COMPONENT SIDE
sKoor| |
COMPONENT SIDE
— 20 —