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  9. Marantz SM-8 User manual

Marantz SM-8 User manual

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MARANTZ
DESIGN
AND
SERVICE
Using
superior
design
and
selected
high
grade
components,
MARANTZ
company
has
created
the
ultimate
in
stereo
sound.
MARANTZ
INTERNATIONAL
Only
original
MARANTZ
parts
can
insure
that
your
MARANTZ
product
will
continue
to
perform
to
the
specifications
for
which
it
is
famous.
Parts
for
your
MARANTZ
equipment
are
generally
available
to
our
National
Marantz
Subsidiary
or
Agent.
ORDERING
PARTS:
Parts
can
be
ordered
either
by
mail
or
by
telex.
In
both
cases,
correct
part
number
has
to
be
specified.
The
following
information
must
be
supplied
to
eliminate
delays
in
processing
your
order:
.
Way
of
shipment
Onhwn
.
Complete
address
.
Complete
part
numbers
and
quantities
required
.
Description
of
parts
.
Model
number
for
which
part
is
required
Vestdijk
9
5600
MD_
Eindhoven
The
Netherlands
Phone:
+31/40.758290
.
Signature:
any
order
form
or
telex
must
be
signed
otherwise
such
part
order
will
be
considered
as
null
and
void.
PARTS
ORDERING
Parts
may
be
ordered
at
the
following
addresses:
AUSTRIA
MARANTZ
Hietzinger
Kai
137a
1130
Wien
BELGIUM
SVD
DIVISION
MARANTZ
Industrialaan
1
1720
Groot-Bijgaarden
Beigium
Telex:
24466
CHILE
MARANTZ
DIVISION
OF
PHILIPS
S.A.
AV.
Santa
Maria,
0760
Casilla
2687
Santiago
Telex:
240.239
DENMARK
MARANTZ
Horsvinget
5
2630
Tastrup
NORWAY
MARANTZ
Postboks
7034
Assiden
3007
Drammen
FRANCE
MARANTZ
FRANCE
4
Rue
Bernard
Palissy
92600
Asniéres
France
Telex:
611651
GERMANY
MARANTZ
GERMANY
GmbH
Alexanderstrasse
1
2000
Hamburg
Germany
THE
NETHERLANDS
Elpro
Marantz
Wint
Hontlaan
28
3526
KV
Utrecht
The
Netherlands
Telex:
4748
SWEDEN
MARANTZ
Box
1324
171
25
Solna
FINLAND
MARANTZ
Kuortanegatan
14
00520
Helsingfors
52
GREAT
BRITAIN
MARANTZ
HiFi
U.K.
Ltd
Kingsbridge
House
Padbury
oaks
575-583
Bath
Road
Long
ford
Middlesex
UB7
OEH
Faxnr.:
0753
680
428
GREECE
SHERTON
ELECTRONICS
S.A.
P.O,.Box
21025
Hippocratus
Street
188
Athens
11471
Greece
Telex:
216.795
JAPAN
MARANTZ
JAPAN,
Inc.
35-1,
7-chome,
Sagamiono
Sagamihara-shi,
Kanagawa
Japan
KUWAIT
AL
ALAMIAH
ELECTRONICS
Ussama
Building
Fahd
al
Saleem
Street
P.O.Box
23781
Safat-Kuwait
Telex:
22694
Telefax:
+31/40.75.82.99
Telex:
35000
PHTC
NL
routing
IND
NLMTFAT
ITALY
MARANTZ
ITALIANA
S.P.A.
Via
Chiese,
74
20126
Milano
Italy
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ARABIA
AL
ALAMIAH
ELECTRONICS
P.O.Box
5954
University
Street
Riyadh
11432
Saudi
Arabia
Telex:
401530
SOUTH
AFRICA
MARANTZ
DIVISION
OF
PHILIPS
S.A.
Main
Road
Martindale
P.O.
Box.
58088
Newville
21114
South
Africa
SPAIN
Euroservice
S.A.
Bernardo
obrégon,
26
28012
Madrid
faxnr.:
3412
306
198
SWITZERLAND
MARANTZ
Technischer
Service
Duenstrasse
3
3186
Didingen
Switzerland
TURKEY
DOGRUOL
Ltd.
LM.C.
6
Blok
N°6310
Unkapani
Istanbul
Turkey
Telex:
22085
MALTA
CACHIA
&
GALEA
Republic
Street,
68D
Valetta
Telex:
1682
PORTUGAL
MARANTZ
Divisao
philips
S.A.
service
Outurela-carnaxide
2795
LinDA-A-VELHA
Telex:
43906
All
of
the
above
locations
are
fully
equipped
to
take
care
of
your
total
service
needs.
Because
various
countries
have
differing
configuration
requirements,
it
is
necessary
that
you
contact
the
service
facility
in
your
particular
country.
In
the
event
that
there
is
no
service
location
listed
for
your
country,
please,
contact
the
nearest
facility
for
the
necessary
In
case
of
difficulties,
do
not
hesitate
to
contact
the
Technical
Department
at
abovementioned
address.
assistance.
MARANTZ
MODEL
Sm-8
STEREO
POWER
AMPLIFIER
wenan
eran
cul.
INTRODUCTION
This
service
manual
was
prepared
for
use
by
Authorized
Warranty
Staions
and
contains
service
information
for
the
Marantz
Model
Sm-8
Stereo
Power
Amplifier.
Servicing
information
and
voltage
data
included
in
this
manual
are
intended
for
use
by
knowledgeable
and
ex-
perienced
personnel
only.
All
instructions
should
be
read
carefully.
No
attempt
should
be
made
to
proceed
without
a
good
understanding
of
circuitry
operation.
The
parts
list
furnishes
complete
ordering
information.
Most
replacement
parts
should
be
ordered
from
the
Marantz
Company.
However,
a
simple
description
is
included
for
parts
which
can
be
obtained
locally.
1.
SHOCK,
FIRE
HAZARD
SERVICE
TEST
CAUTION:
After
servicing
this
appliance
and
prior
to
returning
to
customer,
measure
the
resistance
between
either
primary
AC
cord
connector
pins
(with
unit
NOT
connected
to
AC
mains
and
its
Power
switch
ON),
and
the
face
or
front
Panel
of
product
and
controls
and
chassis
bottom.
Any
resistance
measurement
less
than
1
Megohms
should
cause
unit
to
be
repaired
or
corrected
before
AC
power
is
applied,
and
verfied
before
return
to
user/customer.
Ref.
UL
Standard
No.
1270.
Para.
66.
3.
D
(Mandatory
Test
after
servicing
Electrical
Appliances,
effective
7-1-83).
2.
FEATURES
@
High
power
—
120W
x
2
of
dynamic
“Marantz”
sound
From
the
line
input,
the
audio
signal
passes
to
the
dual
FETs
in
the
buffer
amp
and
then
to
the
first
stage
which
is
a
differential
amplifier
using
dual
transistors.
One
side
of
this
differential
output
is
phase
inverted,
while
the
output
of
the
buffer
amp
passes
to
a
pure
push-pull
amplifier
which
drives
the
final
output
stage.
The
power
amplifier
stage
uses
newly
developed
super
high
fT
power
transistors
in
parallel
three-stage
Darlington
connection.
This
makes
possible
handling
high
currents
with
sufficient
heat
radiating
capacity.
TABLE
OF
CONTENTS
SECTION
PAGE
INTRODUCTION)
2s
c55
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Sak
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ed
eee
ans
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ices
eae
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1
1.
SHOCK,
FIRE
HAZARD
SERVICE
TEST
..........
0...
0c cc
ccc
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eens
1
25
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(id
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3.
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BOARDS
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Gees
ars
cette
ane
Boab
ol
wok
Dae
OG
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2
aah
ee
ae
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ee
2
4.
TEST
EQUIPMENT
REQUIRED
FOR
SERVICING
....................
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3
5.
ADJUSTMENT
PROCEDURES
.............
0.
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3
6.
VOLTAGE
-GONVERSION)
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OS
4
7:
BEOCK
DIAGRAM
08
58
605
Nees
Sree
RE
re
Ree
be
a
ae
Ss
Re
5
8.
DIAGRAM
AND
COMPONENT
LOCATIONS
.............0..
0c
cece
cece
cence
ee ee
eens
6
8.1.
Voltage
Amp.
Assembly
(P700)
Schematic
Diagram
and
Component
Locations
...........
6000
ee
eee
6
8.2
Speaker
&
Meter
Switch
Assembly
(PSOO)
Schematic
Diagram
and
Component
Locations
.............+5
6
8.3
ASO
Protector-Assembly
(PNOO)
Schematic
Diagram
and
Component
Locations
............05
000008
7
8.4
A-B
Power
Switch
Assembly
(PKOO)
Schematic
Diagram
and
Component
Locations
..............+-+--
7
8.5
Power
Amp.
Assembly
(P600)
Schematic
Diagram
and
Component
Locations
.............0000ee0ee
8
8.6
Output
Network
Assembly
(PWOO)
Schematic
Diagram
and
Component
Locations
..............20005
8
8.7.
Test
Point
Assembly
(PJOO)
Schematic
Diagram
and
Component
Locations
..........0.0.
0000
ee
eee
8
8.8
Meter
&
Supply
Assembly
(PX00)
Schematic
Diagram
and
Component
Locations.............2.0080%
9
8.9
A-B
Detector
Assembly
(PLOO)
Schematic
Diagram
and
Component
Locations
.............00-2e00%
10
8.10
Connection
Assembly
(PP00)
Schematic
Diagram
and
Component
Locations
.............
000028088
10
9.
EXPLODED
VIEW
AND
PARTS
LIST
.....
0.0...
0.
ccc
ec
ce
eee
tenes
11
10.
(ELECTRICAL
PARTS
“UIST
>
vac
cee
iic5
concd:
oer
ae
arene
Sie
ESS
wie,
SME
ES
WE
WE
ta
Le
ads
as
18
11.
TECHNICAL
SPECIFICATIONS
.......
2.0...
0...
cc
ccc
ee
eee
eee
een
ne
aee
23
12.
SCHEMATIC
DIAGRAM
............
ccc
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eee
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tenn
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ee
eenes
24
Masts
@
Class
A
—
Class
AB
automatic
switching
circuit
3.
P.W
BOARDS
Quarter
A
allows
the
main
amplifier
to
operate
as
a
pure
class
A
amplifier
for
outputs
of
up
to
30W,
which
is
a
quarter
of
the
rated
output
120W
at
8Q,
at
the
switch
to
class
AB
for
outputs
larger
than
30W.
The
transition
from
class
A
to
class
AB
or
vice
versa
is
carried
out
by
switching
the
bias
current
and
the
power
supply
voltage.
As
can
be
seen
from
the
circuit
diagram
the
chassis
of
Mode
Sm-8
consists
of
the
following
units.
Each
unit
mounted
or
a
printed
circuit
board
is
descrided
within
the
square
enclosed
by
a
bold
dotted
line
on
the
circuit
diagram.
The
automatic
switching
circuit
monitors
the
input
volt-
1.
PowerAmp.
.......
mounted
on
P.W.
Board
P60C
age
of
the
main
amplifier
and
the
output
current
of
the
2.
Voltage
Amp.
.....-
mounted
on
P.W.
Board
P70C
speaker
in
order
to
detect
output
transitions.
Note
that
3.
Test
Point.........
mounted
on
P.W.
Board
PJOC
the
use
of
a
phase
correction
circuit
inside
the
detector
4.
A-B
Power
Switch.
..
.
mounted
on
P.W.
Board
PKOC
prevents
waveforms
including
those
with
a
steep
rising
5.
A-B
Detector.......
mounted
on
P.W.
Board
PLOC
edge
from
being
distorted.
The
automatic
switching
6.
ASO
Protector
......
mounted
on
P.W.
Board
PNOC
circuit
can
be
easily
used
for
amplifier
configurations
7.
Connection
........
mounted
on
P.W.
Board
PPOC
uniquely
designed
by
Marantz
by
merely
connecting
the
8.
Speaker
&
input
of
the
detector
to
the
signal
system.
Meter
Switch
.......
mounted
on
P.W.
Board
PSOC
9.
Output
Network.....
mounted
on
P.W.
Board
PWOC
10.
Meter
&
Supply
.....
mounted
on
P.W.
Board
PXOC
@
Large-sized
peak
power
meter
of
the
logarithmic
com-
pressed
type
Large-sized
power
meters
that
are
suitable
for
high
quality
power
amplifiers
are
available.
This
power
meter
can
be
used
to
check
the
output
level
and
the
balance
between
the
right
and
left
channels.
It
operates
by
detecting
signal
peaks,
but
it
displays
rms
values
which
directly
represent
the
outputs
of
the
amplifier
to
an
8Q
load.
In
addition,
since
a
circuit
generating
logarithmic
com-
pressed
displayes
is
used,
outputs
of
small
to
large
quantities
can
be
monitored
without
changing
the
range.
This
power
meter
can
also
be
used
as a
peak
holder
by
setting
appropriate
switches
on
the
panel.
@
Protective
circuit
which
does
not
degrade
tone
quality
The
overload
protective
circuit
detects
both
overvoltage
and
overcurrent
conditions,
while
in
the
area
of
safe
operation
(A.S.O.)
does
not
degrade
the
operation
of
the
drive
transistors.
The
protective
circuit
has
adaptable
characteristics
so
that
its
operation
does
not
interfere
with
the
program
and
its
operation
is
always
constant.
e
Plus
The
power
output
circuit
is
equipped
with
high
efficiency
heat
sinks
to
cool
the
power
transistors,
thus
providing
continuous
high
output
power.
4.
TEST
EQUIPMENT
REQUIRED
FOR
SERVICING
This
table
lists
the
test
equipment
required
for
servicing
the
Model
Sm-8
Stereo
Power
Amplifier.
Distortion
Analyzer
Distortion
measurements
Audio
Oscillator
AC
VTVM
Oscilloscope
Sinewave
and
squarewave
signal
source
Voltage
measurements
(AC)
Waveform
analysis
and
trouble
shooting
and
ASO
alignment
|
Circuit
Tester
DC
VTVM
Trouble
shooting
Voltage
measurements
(DC)
AC
Wattmeter
Line
Voltmeter
Variable
Autotransformer
(0
~
140V
AC,
10A)
Monitors
primary
power
to
amplifier
Monitors
potential
of
primary
power
to
amplifier
Adjust
level
of
primery
power
to
amplifier
Shorting
Plug
5.
ADJUSTMENT
PROCEDURES
1.
Class
B
idting
adjustment
a)
Apply
a
sine
wave
signal
of
1
to
2
VRMS
to
JL14
from
an
audio
oscillator
in
order
to
forcibly
make
it
Operate
as
a
class
B
amplifier.
b)
Adjust
RL43
and
RL44
so
as
to
give
DC
voltage
of
7
mV
at
the
JJO1-02
and
JJ03-04
test
points.
NOTE:
Carry
out
the
adjustment
one
minute
after
the
switch
is
turned
on.
After
the
set
is
stabilized,
the
voltage
should
be
27
mV
(50
mA).
2.
Class
A
idling
adjustment
a)
Disconnect
the
input
to
JL14.
b)
Adjust
RL39
and
RL40
so
as
to
give
DC
voltage
of
440
mV
at
the
JJO1-02
and
JJ03-04
test
points.
NOTE:
Carry
out
the
adjustment
one
minute
after
the
input
to
JL14
is
disconnected.
The
class
B
ad-
justment
must
be
done
first.
After
the
unit
is
stabilized,
the
voltage
should
be
370
mV
(655
mA).
3.
Comparator
balance
adjustment
a)
Connect
a
trigger
oscilloscope
to
JL14.
b)
Set
the
load
of
the
device
to
OPEN,
apply
a
signal
with
a
frequency
of
1
kHz
and
increase
it
gradually.
c)
While
observing
the
output
waveform
of
the
unit
and
pulses
at
JL14,
adjust
RL31
so
as
to
generate
two
pulses
per
output
waveform
period.
Shorts
amplifier
input
to
eliminate
noise
pickup
rae
acs
Output
waveform
+5V
|
|
JL14
T.P
Ov
4.
Switching
level
adjustment
a)
Connect
a
trigger
oscilloscope
to
JL14.
b)
Set
the
load
of
the
unit
to
OPEN
and
apply
a
signal
having
a
frequency
of
1
kHz
to
the
L
channel.
c)
With
the
output
set
to
15.5V,
adjust
RLOQ
so
as
to
generate
pulses
at
JL14.
d)
Apply
a
signal
to
the
R
channel
and,
similarly,
adjust
RL10.
5.
Power
meter
adjustment
a)
Set
the
load
of
the
unit
to
8Q,
apply
a
signal
having
a
frequency
of
1
kHz
and
increase
the
input
signal
to
30.9V.
b)
Adjust
the
following
so
as
to
give
a
reading
of
120V
on
the
meter.
For
the
L
channel,
adjust
R
X05.
For
the
R
channel,
adjust
RX06.
6.
VOLTAGE
CONVERSION
7.
BLOCK
DIAGRAM
@
EUROPEAN
MODEL
ONLY
OUTLET
BEFORE
CONVERTING
VOLTAGE.
™N
nd
OOOO
S
>
To
convert
the
unit
to
a
different
power
source
voltage,
oS
oe
oe
a
is
change
the
position
as
illustrated
in
the
drawing
below.
7
CAUTION
=5
fy.
3
¥e
=
DISCONNECT
POWER
SUPPLY
CORD
FROM
AC
==
5
a=
OOOO
=
>
n
2
oO
—
oO
Lhd
=
oOo
co
a.
oc
SZ
>
Sos
oO
cw
nac
Voltage
Conversion
Chart
o
=
==
oO
ES
Be
[Sei
Ocry
xoa
sSusa
we
Secs
o
=S>an
Oo
_
r=}
o
=
s
1
a.
'
I
Bea
l
t
!
!
!
|
2
|
YW
io=
I
S26r
*
1s
pa
bbl
—
efbs
=o
oF
aoe
n=
SaaaG
s=
oD
12
ox
wc
==
t=
aa
2a
\
e
1s
n
Mo
i]
—
=
4
[aad
(<<
2s
=
1s
a?
oc
oc <z
1c
uy
WH
kd
[oad
=>
oe
>=
=>
=<
<<
VOLTAGE
uo
ES
ea
1
a
we
-—2
<=
D
SELECTOR
oo
oa
3
1
<
oo
2a
=
'
{
t
!
t
x
|
oad
=z
Lon
'
=
=
'
=
©
{
[we
co
{
wey
a
!
—
oa
|
_——_—
Note
on
safety:
Symbol!
A\
Fire
or
electrical
shock
hazard.
Only
orignal
parts
should
be
used
to
replace
any
part
marked
with
symbol
A
.
Any
other
component
substitution
(other
than
original
type),
may
increase
risk
of
fire
or
electrical
shock
hazard.
8.
DIAGRAM
AND
COMPONENT
LOCATIONS
330
0729
R739
2s
(-1.69V)
(-2.08V)
7h
€65.6V)
R749
12k
8.1
Voltage
Amp.
Assembly
(P700)
Schematic
Diagram
and
Component
Locations
8.3
ASO
Protector
Assembly
(PNO0)
BrOG
VOLTAGE
ANE
LASSY.
a
Schematic
Diagram
and
Component
Locations
me
moe’
R74)
R782
4a.7k
4.7K
330
47k
|
(63.4V)
R785
33k
|
(630v)
Or"
own
cr
109780
0]
|
|
C67)
(2.08V)
20
P
t
Q709
S
Q713
‘E
|
3
4
le
75
ike
|
oy
am
eatin
hes
K
a7i9
C74.0V)
(620V)
CK)
R248
|
5
—O
om
O
©
ae)
©
©
O
~O
O
|
[oy
R738S
R742
(eD.BY,
|
|
4.7K
S
330
(F)
ONLY
220/100V
0718
_|
[e775
+,,100/80Vv
G3.5v)
cex00l
(¥
C777_0.001
aval
K)
R779,\.
47k
ve
167)
(2.08V)
O77)
A
KC)
aria
=p
Q710
OH
:
777
KH
:
PS
ee
x
D>
a8
‘NO
8
C4077
ey
ee
&
Or73
‘aidan
(ov)
9779
7)
c779
1000p
Q716
61.69V)
R732
A
m3
ed
J
708
UN
0720
Rr
eu)
R735
C143)
4.7K
(63.0V),
K)
R744
740
Ul
i
663.3)
656)
C7I2
0.47/00V
R
|
Q722
2/2
PSOO
8.5
Power
Amp.
Assembly
(P600)
Schematic
Diagram
and
Component
Locations
8.6
Output
Network
ilariall
wisbbeas
Schematic
Diagram
and
pompuren
Locations
|
P60O0
POWER
AMP
and
PROTECTOR
|
|
R6EIZ
47
wy
Kk
saa
iy
R607
|
REO!
Q603
C60!
27k
270p
623
0.047
rR
O
Oo
A
..
é
5
On
So
os
=
O
rae
O
O
3
5
Oo
a
5
O
A
5
O
2°
|
rf
JOS
9)
(Sw)
R626
R644
wze|
f°
cer
sas
(WQ61
9636
|
ee
(43.50)
R646
We
K)
raw
Visine
47k
er,
5s?
Q6i8
L___
3
or
A
We
y
a
a
nett
3
S080)
(-L46V)
2
|
jeosow
an
:
CE05UN-270V)
(-0.79V)
Q620
TT
\
oe
Bore
art
oe
2
iw
oe
R
"Sens
anmeestectonseonr
cc
ene
sreamestrit
onetime
aeenteaner
enn
22.0)
Q640
Q624
&
&
%&
ret
6
ov
tes”
os
8.8
Meter
&
Supply
Assembly
re:
Schematic
ee
and
Component
Locations
220780v
|
[COV
5s
leech
€74.0V)
2
[|
|
Olvliolz
ee
HO
00
OO
eee
OD
L
[
BS
of
O~
t
=
x
5
rr)
Yo
x
5S
8.7
Test
Point
Assembly
(PJ00)
Schematic
Diagram
and
Component
Locations
JJO1
JJO2
9.
EXPLODED
VIEW
AND
PARTS
LIST
8.9
A-B
Detector
Assembly
(PLO0)
Schematic
Diagram
and
Component
Locations
@
[C01-99]
Front
Panel
0058
7)
-“@
Be
Ge
QLO3-1/4
021B
,
@(U):
for
U.S.A
e
(E):
for
Europe
e(F):
for
Japan
PART
NO.
DESCRIPTION
222H063400
Front
Panel
Assembly
222H063010
Escutcheon,
Front
Panel
2461063030
Escutcheon,
Pocket
Frame
2144160020
Bracket
222H063020
Escutcheon,
Pocket
Panel
51060305A9
|
P.H.M.
Screw
P3
x5
2461271010
Holder
51042610A0
F.H.M.
Screw
F2.6
x
10
53112603A0
|
Hexagon
Nut
M2.6
51100204E0
B.H.M.
Screw
B2x4
1143259010
Bushing,
Pin
Holder
2978259110
Bushing,
Push
Switch
201H158010
|
Window,
Meter
2461063420
Pocket
Cover
Assembly
2144063410
Pocket
Cover
Assembly
2461063050
Escutcheon,
Pocket
Cover
2461253010
Handle
2461253210
Handle
2461254010
Pin
2461254020
Pin
53110303E9
Hexagon
Nut
2461107020
Sheet
][]
P
ABH
NNN
|
oa
oo
oa
a
[|=
RPRANNNA
DY
BW
ean
a
—"-
PEPNNNAHND
awa
wa
51500308Z0
F.H.
Tapped
Screw
F3
x
6
51280308Z0
B.H.
Tapped
Screw
B3
x
8
10