Sherwood am-9080 User manual

SERVICE MANUAL
AM-9080/B
@
Sherwood
5-CH POWER AMPLIFIER
§ Sherwood
NEWCASTLE
eS
5-CH POWER AMPLIFIER AM-9080
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« CONTENTS &
SAFETY PRECAUTIONS seceacSisicentencscgacshiider vic ctacerseuteadesconsseueecwondseetscdvosds sbeisens ccacsasesuvese coocuvepecdestessoasateesea tence 2
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BLOCK DIAGRAM............ ucveaccevanncteacaxeudaweraricedssineansesonecadebcadevsdccacebucaaserdsavncdvectaceusysssbluucweatdagabeesescunseasecesvesse 6
TROUBLESHOOTING waves cccevecdesccel doessccvevboniliecs covoawcdiuseucde seluedinsadcuatensen secs otaveusedaccbecastessseaersecesdseessesdoateeedanser 8
MEGHANIGAL PARTS LISE sc siscaccsausetivsdh Gece sucavlecteccoesacsveciedlbsseveds nce cvvsdseesesvedetansasesvessaseusadtaliveswenusenvaedsaders 9
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IC’'S FUNCTIONAL BLOCK DIAGRAM ..............:csssccsssssscerscecseenenereccecnensceccsccssesseeesesecesesseneeesecseeesconenssuareres 20
SCHEMATIC DIAGRAM (1, IL, Il) .....cscssscssseessscsseesseecssesecsssseessennensscnseseeseecnscesnseesagesusenessenreesersreaees see sesesoees 22

SAFETY PRECAUTIONS
WARNING
Before servicing this unit, familiarize yourself with the following precautions:
1. Many electrical and mechanical parts in this exposed metal parts of the cabinet, such as
chassis have special safety characteristics that
often pass unnoticed and the protection
afforded by them cannot necessarily be
obtained by using replacement components
rated for higher voltge, wattage, etc.
Replacement parts that have these special
safety characteristics are identified in this
manual and its supplements: electrical
components having such features are -
identified by A\ in the schematic diagram
and the parts list.
Before replacing any of these components,
read the parts list in this manual carefully. The
use of substitute replacement parts that do
not have the same safety characteristics as
specified in the parts list may create shock,
fire, or other hazards.
. Before returning the set to the customer,
always do an AC leakage current check on the
AC Outlet
At 5000 Q per volt or greater sensitivity ,
the reading should not exceed 0.75 V.
0.15 «F150 V AC
Place the probe on each exposed metalic part.
terminals, screw heads, and metal overlays,
to be sure the set is safe to operate danger of
electrical shock. Plug the AC line cord directly
into a 120 V AC outlet (120 V AC version only).
(Do not use a line isolation transformer
during this check.) Be sure your AC voltmeter
has a sensitivity of 5000 © per volt or greater.
Then connect a 1500 Q 10 watt resistor,
paralleled by a 0.15 pF 150 V AC capacitor,
between a known good earth ground (such as
a water pipe, or conduit) and the exposed
metalic is parts, one at a time. Measure the
AC voltage across the combination of a 1500
Q resistor and a 0.15 pF capacitor. Reverse the
AC plug at the AC outlet and repeat AC
voltage measurements for each exposed
metalic part. Voltage measured must not
exceed 0.75V RMS. This corresponds to 0.2
mA AC. Any value exceeding this limit
constitutes a potential shock hazard and must
be corrected immediately.
AC Voltmeter.
Good earth ground, such as
a water pipe or conduit.

SPECIFICATIONS
-
Power
output,
stereo
mode,
82
(THD:0.05%
,20HZ~20KHZ)
rere
2X
410W
42
(THD:0.09%.20HZ~20KHZ)
w-rrrnnnnene
2X
180W
5-CH
mode,
82
(THD:0.05%,1KHz)
meres
5
X
120W
42
(THD:0.09%,1KHz)
5
X
200
W
-
Dynamic
power,
stereo
mode,
852,
rere
rnrmmnmnnnmmannmmnnmanannnrnn
2X170W
AQ,
ennai
2X270W
5
-CH
mode,
82
wnt
senseoereeaneeanecasonnscnuatsnnatonaeesenates
5X165W
.
1
5
X
260
W
.
Total
harmonic
distortion,
82,
20
Hz
~
20
kHz,
1W
vesescnssenernsasnscnenssocnccnaversansesocnnovesonanessnnuesssnassetse
0.03%
Intermodulation
distortion,
82,
SMPTE,
1W
se
atoncsnscenssceensonsnseoes
0.03%
Input
Sensitivity,
47K.Q
meneame
4000
mV
-.
Signal
to
noise
ratio,
IHF
"A"
weighted
Reference
100W,
8.2,
0
AB
--ssnutnnannmnanmmmmnnnnnnasnnnanamnaniinnntntt
115
dB
Reference
1W,
8.2,
0
GB
wmrrnnnnnnnnnnmunnnnninnnnninnnnmninmnmnninmnnnnsinniin
4100
dB
-
Frequency
Response,
5
Hz
~
450
KHZ
wnnsnnmennnmnmmnanmnnsnnnnnnmnnnnnn
+0,
-3
dB
-
Channel
separation
-
|
AAA
=
as
daa
a
ae
a
ected
80
dB
4O
KHz,
wnnneennninnnennnnnneientnnneettnnnmnnnnnnannninntnnitnnnnnnnnnnnmnmnnnnminnnntt
70
dB
&
Damping
factor
mrnnnnnnnnnnnnmannnnnnnnmnnnnnnmnmnnnnnnnnnsnnmanmananinninanntii
425
E: GENERAL
©
Power
SUpply,
=-snnnmnnnannennnnnnannnnininninanmsnnnsnnnnnnnennn
AC
230V,
50
Hz
-
Power
consumption,
stanby
MOG
rrrnnrermnnnnnnnmsnensinnnnnsninennsnnnnn
1W
operating
(power
On)
MOE
ww
nmnnsnnnnnennnennsnnnnnnmnannn
4900
W
©
Dimensions
rrr
Dineen
Serr
el
Ree
eens
440
X
180
X
450
mm
(17-3/8
X
7-1/16X
17-3/4
inches)
|
Weight
(Net)
errrrenmrnmarnnnannnnnnnninnntinnnnininnannnne
ve
32
kg
(70.5
lbs)
Note
:
Design
and
specifications
are
subject
to
change
without
notice
for
improvements.

SHER-00426 / DRUCK: 1
CNT704
PCB2-2 (DIGI-LINK)
CNT303 CNT 302
PCB2-1 (CPU)
CNT304
CNTSOO
PCB2 (POWER)
CNT502
CNT506&
CNTSO3
CNT505
plows
CNT504
CNTSO07
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WIRING DIAGRAM |
CNT912
CNTSO0%4
CNT402
PCB1 (AMP)
FRONT-LEFT-CH
CNT401
PCB1 (AMP)
REAR-LEFT-CH
CNT404
PCB3 (PROTECTION) ;
ENTSO5
CNT402
PCB1 (AMP)
_ CENTER-CH ~
CNT401
POSISTER
PCB1 (AMP)
REAR-RIGHT-CH
CNT404
. CNTS907 |
CNTSOS
CNT 402
PCB1 (AMP)
FRONT-RIGHT-CH
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Model No. : AM-3080/B .

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BLOCK DIAGRAM |
Model No. : AM-9080/B |
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SHER-00426 / DRUCK: 2

TROUBLESHOOTING
If a fault occurs, please consult the table below before taking your power amplifier in for repair.
If the fault persists, please attempt to solve it be switching the power amplifier off and then
on again.
If this fails to resolve the situation, consult your dealer.
Under no circumstances should you attempt to repair the power amplifier yourself as this could
cause injury and invalidate the warranty.
No power
No sound from
one channel
Excessive hum at
normal volume
level
Distorted sound
- The AC input cord is
disconnected.
Poor connection at AC
wall outlet or the outlet is
inactive.
Speaker cords are
disconnected.
- Incorrect connections between
_ the components.
- Incorrect operation of the pre
amplifier.
- Speaker cords are connected
incorrectly or incompletely.
- Incorrect connections between
the components.
- Defective speaker.
- The hum is induced from other
components.
- Defective connection cords.
- The power amplifier overdriven.
* Too low impedance speakers
are connected.
- Connect cord securely.
- Check the outlet using a lamp
or another appliance.
- Check the speaker connections.
- Make connections correctly.
- Check the functions of the pre
amplifier and operate correctly.
- Check the speaker connections
and reconnect them.
- Make connections correctly.
- Check the speaker and repair it
or replace by new one.
- Place the power amplifier away
from the pre amplifier and record
player.
- Replace by new ones.
- Decrease the volume on the pre
amplifier.
- Check the speakers and use the
speakers with the impedance of
4~82.

* Parts without Parts No are not suplied.
REF NO. DESCRIPTION PARTSNO. Q'TY VER. © REFNO.
PACKAGE
CUSHION,SNOW 6230045184010 4
DIGI LINK, GOLD 1063040790000 1
GIFT BOX 6007040740100 1 A
GIFT BOX 6007040740200 1 BIDIK
INSTRUCTION MANUAL 5707046970010 1 A
INSTRUCTION MANUAL 5707046970020 14 K
INSTRUCTION MANUAL 5707046970031 1 B/D
POLY BAG (330°240"0.05) 6330040062010 1
POLY BAG, 800(W)*900(D)*0.08T 6330041319010 1
RCA CORD (1500MM"*6) 1063115200010 1
WARRANTY CARD 5727040060010 4 K-
WARRANTY CARD 5727041620020 1 B/D
WARRANTY CARD 5727041630010 1 A
WARRANTY CARD (NORSAT) 5727041040020 1 K
CABINET & CHASSIS
1 BADGE, INKEL 5637041181010 4 K
BADGE, NEWCASTLE 5637041237010 1 ABD
2 FRONT PANEL 3067046428010 1 K
FRONT PANEL 3067046428020 1 A/D
FRONT PANEL 3067046428030 1° B
3 ENDCAP"L" 4317049991010 1 A/D/K
END CAP °L” 4317049991020 1 B
4 END CAP "R" 4317049981010 1 A/D/K
END CAP 'R" 4317049981020 1 B
BADGE, TDAS 5637041171010 1 K
COVER PANEL 3067046498010 1 DIK
COVER PANEL 3067046498020 1 A
i COVER PANEL 3067046498030 1 B
7 DECORATION, GRAY PANEL 5127041101010 1 ADIK :
DECORATION, BLACK PANEL 5127041101020 1 B
8 . SHIELD COVER 3070046750010 1
BUTTON PUSH 5088041338010 1 A/DIK .
BUTTON PUSH 5088041338020 1 B:
40 CUSHION, BUTTON ST-BY 4050048019010 1
11. BUTTON, STAND BY 5090091001010 1
12. SHAFT SWITCH 2400041551010 1
13 FOOT 4007041021010 4
14. FRONT CHASSIS 3200056466010 1
15 CENTER CHASSIS ! 3200056456010 1
16 MAIN CHASSIS 3200056476010 1
17 HEAT SINK, MAIN 2120044998010 1
18 HEAT SINK, SUB 2120045008010 1
49 TOP CABINET 3007045466010 1
20 POWER TRANS, 220V/60HZ (150MA) 8200281018470 1 K
POWER TRANS, 230V/50HZ (130MA) 8200281018170 1 B/D
POWER TRANS, 120V/60HZ (230MA) 8200281018770 1 A
21. POWER TRANS, 220V/60HZ (100MA) 8200281018670 1 K
POWER TRANS, 230V/50HZ (130MA) 8200281018370 1 B/D
POWER TRANS, 120V/60HZ (180MA 8200281018970 1 A
MECHANICAL PARTS LIST.
22
23
24
25
26
$1
$2
$3
$4
$5
S6
$7
DESCRIPTION
PARTS NO.
POWER TRANS, 220V/60HZ (150MA) 8200281018570
POWER TRANS, 230V/50HZ (130MA) 8200281018270
POWER TRANS, 120V/60HZ (230MA) 8200281018870
BRACKET, HEAT SINK
BACK CHASSIS
BACK CHASSIS
BACK CHASSIS
CORD ASSY, 15A250V (2400MM)
CORD ASSY, 16A/250A (2800MM)
CORD ASSY, 15A/125V (2500MM)
POWER SHIELD
SCREWS
SCREW,+3S 4*8 BK/BH
SCREW +2S 3°8 B-TYPE BK/BH
SCREW +WSAM 4X8B
SCREW WPTT3X6Y
SCREW, WASHER ZNY+2S 3°16
SCREW, COATING GND
SCREW, +#2FTC 3X8B
MISCELLANEOUS
BUSHING
TERMINAL GND
CUSHION, 20°1°50
CUSHION, 20°1°260
CABLE TIE DACT-100A
4010057136010
3207056456010
3207056456020
3207056456030
L068000990010
L068001000010
L068001010010
3070200012010
B020940083B10
B020030083B10
B020940083W10
B020030061W10
1507041146010
1507040996020
BO10530083F 10
2410040353010
3790040766010
4050043515020
4050043525010
4330040343010
1
Q’TY VER.
1
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=
a a ee Se ay
Pe Se oe Sy
K
B/D
B/D
B/D
B/D
B/D
B/D
B/D
B/D

EXPLODED VIEW:
Model
No.
:
AM-9080/B
:
SHER-00426 / DRUCK: 3

-7020-05953-000-B-
PROTECTION B'D
AIM 2x a
jCNTS0S
SHER-00426 / DRUCK: 4
7 Sw2
®¢ PROT,
SHORT|
Post
[SND
GND
OND
Model No. : AM-9080/B |
CNTSOT
CNT9O9
poy oe ;

SHER-00426 / DRUCK: 5
.
PCB2 (POWER)
ATTENTION:
REMPLACER UNIQUEMENT PAR
UN FUSIBLE DE MEME TYPE.
7) a
ORE | NBA Zev | HBZ-EAZEOT BINA
GAINS ONLY WITH SAME
TYPE AND RATING OF FUSEIS)
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c
*
=
GS
Os
PCB2-3
(POWER SW).
PCB2-1 (CPU)
BAR CODE
PCB2-2 (DIGI-LINK}
1020-05952-004-A
DIGI-LINK B°D
exh:
15
Model No. : AM-9080/B |