Nakamichi OMS-7 User manual
Service
Manual
Nakamichi
Nakamichi
CONTENTS
Ne
10.
11.
12.
ONO
ees
bs
Rata
ince
HERA
NS
ay
arctan
neta
Cte
das
og
oat
Laer
te
cute
dy
1h
hati
2
Pickup.
Replecetnent
Procedures
3
cciss
0:54
a
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nioin’e
oa
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veuld
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bc
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ee
2
2,
1
Notice
in
Handling
Pickup...
06.
esc
e
cence
cedenenseuvteeenvetucvenee
lll,
2
2.
2:
Pickup
Replacement
Procedures
...........
0.0...
ceeeeeceee
cece
eee!
2
2.
8.
Adjustment
After
Replacement
of
Pickup
....................00.00..000000000002
3
Measurement
Instruments
and
Test
Discs
.....
2.0.0.0...
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4
Parts
Location
for
Adjustment
..
1...
6.
e
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ence
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et
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4
4,
1,
Pacts
On
PO
By
NEY
seks
wale
Woe
ias
ngs
wind
alae
4
holes
rad
da
Cook
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ween
4
4,
2,
Parts
On
PICUMD
sicece
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Ckipials
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Bias
pei
wife
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|
Banlieue
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4
POMERRCNE,
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cre
Nin
pean
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Fwenide
wakes
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Lem
eae
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ue
5
5.
1.
NGI
it
ert
o
MOMs
Vache
ole
epee
Nene
eae
Huma
wuubed
bnahadiiews,
oo.
5
5.
2.
Adjustment
Instructions
..
0.6...
0...
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cent
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ence
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L
5
Mechanism
Ass’y
and
Parts
List...
2.0.0.0...
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10
6.
1.
Oy
VDGHIB
fede
sais
ata
ieritndy
ie
gear
mien
aired
Ghee
kod.
a
ane
Na
dna
arom
de
hand
Sooo
eae
10
6.
2.
Prone
Panel:
Bag
y
(AOL):
os
i.5
4
squat
oy
<a
es
a
avece-soidh’y
aed
baw
saranda
d
ahn
un
Be
Base
es
ee
11
6.
3.
Canals
Asa'y
(AQZ)
ooo
st
acs
oihene
a/v
Sb
Pace
a
ead
dood
Ak
Blah
Wa
Woe
ae
dete
12
6.
4.
Disc
Mechanism
Ass’y
(B01)...
1...
eee
eee
eee
eee
e
eee
ell.
13
6.
5.
Rear
Panel
Ass’y
(B02)
.....
0.0...
0c
c
eee
eect
eee
cece.
Si
4S
ce
gh
eed
atten
ete
wetahs
15
6.
6.
Disc
Mechanism
Sub
Ass’y
(C01)...
cece
ence
eben
eee.
15
6.
7.
Analog
Processor
Unit
(D01)
2.0.6...
.
eee
ec
cece
eet
nee
n
cence,
16
Mounting
Diagrams
and
Parts
List...
0.6.0...
eee
cece
ete
ete
eee
ence
c
eel
17
Te.
A
Photo
Transistor
P.C.B.
Assy
60...
0...
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cece
ec
ence
ences
eeseveneen
cee.
17
Te
2%
Photo:
Diode
PCB.
Ags
ye
5
i
5:5
cao
sa
than
arden
¥
OV
oan
6/d
bod
GR
Bev
Siow
own
Cee
nn
4
kes
17
7.
8.
Open'End
Switch
PCB.
Ags
you
iic's.
ws)
w
died
alecg
ver
ha.
Fd
he
Weeder
ava
goa
17
7.
4,
Close
End
Switch
P.C.B.
Ass’y
2.0...
eee
eee
ene
e
ene
ee
eel,
17
7.
5.
Eject/Load
Switch
P.C.B.
Ag
Yi.
cees
bi
bee
be
Lvae
sect
etetevivenceuccnr
en,
17
7.
6.
Power
Switch
P.C.B.
Assy
2...
eee
cee
cee
cece
enc
eeeateeteenvecnn
cee.
17
7.
7.
MOMS
PCBs
ABS
Ya
sea
ose
SoA
545
sare
wy
diy
GE
wh
a
SS
5
wsh-w
Se
leads
|
teri
dole
Oo
17
7.
8.
Remote
Control:
P.C.B
Assy
i
..0
63g
6
agen
dois
een
ig
bod
web
ab
odd
dav eae
Cdk
oun,
17
7.
9.
Pindack
BC
Bi
Aga
ye
ty
cssnia
a
acho
baa
olec
arg
Beach
aM
WN
@
Siac
sg
RE
ae,
Lt
De
18
7.
10
BL
Indicator
CB
Aggy.
3
e042
cas
ni
edie
wander
&
Sacaty
s
aS
GaN
GY
Pas
ack
diteadet
e
18
7.11
Headphone
Amp.
P.C.B.
Ass’'y
.
1...
cet
cee
cece
tence
nee
ce
en.
19
7.
12.
Auto
Power
Control
P.C.B,
Ass’y.
2...
2.
ke
eee
eee
e
beeen cece.
19
7.
18.
RE
ErecAm
po
ECB
AS:
22.2
s)atein:
aula
beet
mahigha
salsa
qe
iden
wal
ore
aloe
24
ake
d
SUL
Aki
20
7.
14,
Powersupply
PCB.
Aggy
2
ono
as
hel
a
ten
WA
a
ak
ounain
dl
PE
ouch
wb
Oe
Rie
Ecos
21
7.
15.
Control
Switch
P.C.B.
Ass’'y
6...
0
ec
cce
ete
eect
tet
nveusenenceee.
22
7.
16,
Analog
Processor
P.C.B.
Ass’Y
6...
ct
cece
eee
nent
ne ee
been
cele,
22
Teli:
Dif
Converter
PCB
Aas
9
5
gn
is
wikia
acu
id
Mioe
deg
ig
Ban
bs
Redd
esa
W
dhaeweie
dj
ok
ola
ee
23
7.
18.
Matin
BC
BcARe
ys
ecectthne
aera
Geaie%
Gee
ote
Raat
eed
t
eutpcla'y
wart
Goes
seen
bbweg
he
eer
«
26
Schematic
Diagrana
soo.
2.4.5
d-osec0:
4%
alee
84a)
held’
s
Woe
Lode
64-9
SG
0
4
wb
4nd
Ea
wee
LA
dw,
27
8.
1.
IC
Block
Diagrams
and
Descriptions
........0...0.00
000.
cc
cece
cence
nee
eeececeeeue
27
8.
2.
Waveforms
at
Major
Points
.....
0...
0...
c
cece
ee
ence
tence
eee
ence
eee.
37
8.
3.
Dchemaue
Diagram
4
je
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2d
se
okie
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wed
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whose
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ll
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38
Wiring
Diagram
2...
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eign
area
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Block
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PAU
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39
Remote
Control
Transmitter
Unit
RM-7
..
0.6...
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cc
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40
11.
2.
Mechanism
Ass’y
and
Parts
List...
2.0...
ke
cee
ten
cece
cece
eee
40
11.
2.
Mounting
Diagram
and
Parts
List...
2.2...
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teen
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eneeeeee
41
11.
38.
mchematic-
Diagram.
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42
1,
GENERAL
1.1,
Voltage
Selector
Voltage
selector
is
installed
on
the
rear
panel
for
Other
version
of
the
Nakamichi
OMS-7,
This
voltage
selector
can
select
either
120
V
or
220-240
V
at
customer’s
disposal,
1.2.
Packing
Materials
and
Owner's
Manual
Part
No.
Description
Q'ty
0C81046A
Outer
Carton
OMS-7
1
0C81081A
Outer
Carton
OMS-7E
1
0C81082A
Outer
Carton
OMS-70
(Japan)
1
0C81047A
Inner
Carton
OMS-7
1)
0C81085A
Inner
Carton
OMS-7E
1
0C81086A
Inner
Carton
OMS-70
(Japan)
1
0C81051A
_
Side
Packing
L
1
0C81050A
_
Side
Packing
R
1
0C81052A
Mirror
Mat
Bag
1
0D04491A
Owner’s
Manual
OMS-7
&
OMS-5
(English)
1
0D04493A
Owner's
Manual
OMS-7/7E
&
OMS-5/5E
1
(English
/German/French)
0D04492A
‘Owner’s
Manual
OMS-70/50
(Japanese)
1
WARNING:
To
protect
eyes
from
laser
beam
during
servicing,
DO
NOT
LOOK
AT
THE
LASER
BEAM.
Note:
Laser
Diode
Properties
Material:
GaAlAs
Wavelength:
790
nm
—
820
nm
Emission
Duration:
continuous
Laser
Output:
0.7
mW
max,
Classification:
Class
III
b
2.
PICKUP
REPLACEMENT
PROCEDURES
2.1.
Notice
in
Handling
Pickup
In
case
of
repair
or
replacement
of
the
Pickup,
pay
attention
to
the
following
handling
instructions
since
the
laser
diode
in
the
Pickup
is
not
resistant
to
static
electricity.
(1)
Repair
or
replace
on
a
work
stand
on
which
the
conducting
rubber
is
spread.
(2)
Use
ceramic
soldering
iron
with
GND.
(8)
Since
Pickup
is
supplied
as
a
spare
part
in
a
conductive
bag,
take
it
out
of
the
bag
only
when
you
need
it,
(4)
Remove
the
shorting
pin
and
conductive
sponge
that
short
the
connector
pins
of
the
Pickup
after
entire
work
is
completed.
(5)
Do
not
turn
the
adjustment
screws
(Focus
Screw,
RF
Signal
Phase
Screw
and
Tracking
Screw)
of
the
Pickup.
If
they
are
turned
widely,
it
may
take
much
time
to
readjust
them.
2.2,
Pickup
Replacement
Procedures
(1)
Place
the
Compact
Disc
Player upside
down
on
the
work
stand
and
remove
the
Bottom
Cover
by
unfastening
10
screws,
(2)
Rotate
the
pulley
of
the
Disc
Mechanism
Ass’y
to
move
the
Fig,
2.2
Pickup
in
the
direction
of
the
arrow.
See
Fig.
2.1.
(3)
Remove
FO1,
F02
and
FO3,
and
pull
out
F04.
See
Fig.
2.2,
(4)
Remove
F05,
FO6
and
FO7,
and
pull
out
FO8.
See
Fig.
2.3.
Fig.
2.1
Fig.
2.3
(5)
Remove
two
connectors,
unsolder
the
two-core
shield
cable,
and
unsolder
F09
to
separate
FO9
from
the
Pickup.
See
Fig.
2,4,
(6)
Loosen
F10
and
remove
F11
(Pickup).
See
Fig.
2.5.
(7)
Mount
a
new
Pickup
and
temporarily
fasten
it
with
F10.
See
Fig,
2.5.
(8)
Remove
the
conductive
sponge
of
the
new
Pickup,
(9)
Mount
F09
on
the
new
Pickup
by
soldering,
Plug
in
the
two
connectors
and
solder
the
two-core
shield
cable
to
the
Original
place.
Soldering
of
the
shield
cable
must
be
made
in
the
order
of
GND
wire
with
black
tube
and
then
signal
wires,
(10)
Mount
the
new
Pickup
by
reversing
the
disassembly
Procedures,
(11)
Pull
F12
(shorting
pin)
out
of
the
Pickup.
See
Fig.
2.6.
Fig.
2.4
Fig.
2.6
2.3.
Adjustment
After
Replacement
of
Pickup
Upon
completion
of
replacement
of
the
Pickup,
perform
rough
adjustments
following
the
flow
chart
shown
in
Fig,
2,7.
Then
proceed
to
the
final
stage
adjustment,
ie.,
‘Adjustment
Instructions”’
in
item
5.2
except
step
1
‘“‘Laser
Power
Adjustment”
(step
1
is
already
done
in
the
rough
adjustment),
START
Laser
Power
Adjustment
as
per
Step
1
Offset
Adjustment
of
Focus
Servo
(TP7,
RV105)
as
per
Steps
2-1
&
2-2
Tracking
Servo
Adjustment
(TP6,
RV102,
RV103)
as
per
Steps
3-1
to
8-5
Focus
Screw
Adjustment
(TP7,
Focus
Screw)
as
per
Steps
4-4
&
4-5
RF
Signal
Phase
Alignment
(TP1,
RF
Signal
Phase
Screw)
as
per
Steps
5-4
&
5-5
Tracking
Screw
Adjustment
(TP1,
Tracking
Screw)
as
per
Steps
6-3
&
6-4
DL
Signal
Adjustment
(Emitter
of
Q103,
RV101)
as
per
Steps
3-6
&3-7
EFM
Signal
Adjustment
(TP1,
RV104)
as
per
Step
3-8
Are
EFM
signal
at
TP1
&
playback
sound
clear
2
Adjustment
for
Scratch
and
Dot
on
Disc
as
per
Step
10
Fig.
2.7
3.
MEASUREMENT
INSTRUMENTS
AND
TEST
DISCS
(1)
Synchroscope
(15
MHz
or
more)
(7)
LPF
(Low
Pass
Filter):
(2)
VTVM
Pass
Band
—
4
Hz
to
20
kHz,
Attenuation
—
60
dB
or
more
(3)
DC
Voltmeter
for
24.1
kHz
or
higher
frequency
(4)
Optical
Power
Meter
Recommended
LPF:
Philips
Type
7122
780
29020
(5)
Philips
Test
Sample
Disc
5A
(8)
Distortion
Meter
(6)
Sony
Test
C.D.
YEDS-7
4.
PARTS
LOCATION
FOR
ADJUSTMENT
4.1,
Parts
on
P.C.B.
Ass’y
8
[b3000005}
|
Main
P.C.B.
CN201
D/A
Converter
PC.B.
RVSO1
Audio
Signa!
Belonce
RMOS
180n
—--
onsfifone
Laser
Power
RVMOI
Auto
Power
Control
P-C.B,
RVIOS
RVIO4
@
TPG
Te7
®
©
RvIWS
RVIIO
Pickup
Movement
Fig.
4.1
4.2,
Parts
on
Pickup
RF
Signal
Phase
Adjustment
Screw
Focus
Screw
Tracking
Adjustment
Screw
Lock
Screws
for
Focus
&
RF
Signal
Phase
Adjustment
Lock
Screws
for
Tracking
Adjustment
Fig.
4.2
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2
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