Nakamichi BX-125 User manual
Nakamichi
Service
Manual
Nakamichi
BX-125
BX-125E
2
Head
Cassette
Deck
CONTENTS
2.
3.
1.
General
34.65
3.4)
helt
eo
attire
Eanes
Stra
ty,
ala
Ae
a
earths
Ras
Seats
keel
d
eae
Rd
A
oe
coe
aBeoatedel
ty
hae
Ae
1
Test:
Tapes
and:Gauges
«3.05006
3.5
ie
ev
cnewinaa
Pd
Soro
ve a.
ON
goods
SES
RP
de
oboe
BOR
la
ek
Gi
ee
2
Mechanical
Adjustments:
2265-0516
666.002
Vinod
Baia
GS
Soslle
WR
ats
Bed
eee
wie
Peewee
De
betta
ey
ihe
2
38. 21.
Tape
Guide
Height
Check
for
Record/Playback
Head
and
Erase
Head
................-02..
2
8.
2.
Head
Base
Stroke
Check
......
0.0...
0c
cece
eee
ee
ee
een
eee
e
ene
ce
ee
2
3.
3.
Record/Playback
Azimuth
Alignment
and
Height
Check
..............
0.00
eececcces
2
3.
4,
Pressure
Adjustment
of
Pressure
Roller...
2...
ee
ee
ee
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3
3. 5.
Tape
Travelling
Check
oo.
5.0
3.56e
eee
ee 8b
adie
Beck
kG
ae
olga
bags
S08
OM
Row
ahaa
ncaa
3
3.
«6.
Eject
Damper
Adjustment
.........
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3
3.
7.
Reel
Motor
Speed
Adjustment
in
Play
Mode
.........
0.0...
00.
cece
eee
ence
e
een
ee
3
3. 8.
Tape.
Speed
Adjustments
se.
5)
5
ee
eees
koe
Svea
cee
he
eae
Bek
Bk
ea
bo
ly
OR
hg
3
3.
9.
TUBPiCAbION
65)
oso.
3.
S552
eo
ANE
ek
Ea
eylee
wee
aticel
Pode
A
et
es
ae
a,
ened
mnaese
pata
no
Le
3
Parts
Location
for
Electrical
Adjustment
.........0.0
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4
Electrical
Adjustments...:3.
6
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be
0
bbe
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bs
5
5.
1.
Adjustment
Instructions
2...
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00
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eens
5
5.
2.
Playback
Frequency
Response
Adjustment
..........
0.000
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ece
ce
cee
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neeyees
7
Mechanism
Ass’y
and
Parts
List...
1.1...
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ne
en
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e
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eneuns
8
6.
1.
SY
MEN
SSI9
25
32
vetig
sn
red
ce
yarn
tas
hence
yt
a
teu
peer
Me
osc
eae
eye
ae
reese
ay
Bee
a
eat
a
BE
cect
8
6.
2.
Synthesis
Mechanism
Ass’y
(A01)
........0.0
0.00.
cece
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ee
ee
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een
eee
eenns
9
6.
3.
Mechanism,
Ass’y-(BOL)
so...
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5S
be
Gh
edivnc
ohaccw
ee
vba
vane
Seals
ese
av
hh
tbody
elation
g
11
6.
4.
Rear.
Panel.
Ass’y
(B02)
©
ss...
cosy
dace
sb
eee
ooo
wie
ae
Dae
G
aE
eagle
bia
13
Mounting
Diagrams
and
Parts
List
..
0.0.0...
occ
ee
eee
ee ee
een
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nen
ene
eennnas
14
PALL
Power
Switch
P.C.B.
Ass’y
2.0...
ccc
ec
ec
eee
tne
ec
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eseerteeeuas
14
Te
2.
GED:
PCB:
Assy
se
ise
laced
tn.
Gey
ee
8
a
aaa
ts
need
eesti
ee
ea
late
gto
tee
ae
be
TA
7.
8.
Timer
Switch
P.C.B.
Ass’y
......
GiRaEES.
oh
toni
Semin
es
3.8,
codons
Ie
settaco
a
encumid
inno
wind
14
7.
4,
Shut-off
P.C.B.
Ass’y..........
Poe
Gable
elk
ahd,
See
im,
do
Gis
oe
datos
dh,
Blige
ce
de
ge
onde
Mitbne
IS
Be
EM
ee
ge
eae
de
14
7.
6.
Dolby
NR
Switch
P.C.B.
Ass’y
2...
eee
eee
eee
eee
nee
bbe
nae
15
7.
6.
Volume
PC.
Bs
Assy
0
scsi
bea
a
Seay
ahiacs
whee
Ras
ig
oe
aud
atone
Pons
d
ate
ah
Be
oe
SO
15
7.
7.
Control
Switch
P.C.B.
Ass’y
2...
2...
ee
eee
ee
eee
eben
een
nenns
15
7.
8.
Tape
Switch
P.C:B.
Ags?
V
oe
oh
eed
aaa
goed.
duels
we
Peg
Se
altaal
bce
bed
Gow
dow
Bablate
ohio
wees
16
7. 9.
Indicator
P:C.By
Ass?
Y
225-5:
Gee
wie
icky
bec
ROE
apd
Uae:
Degen
ati,
8
Bosh
bossa
eee
aoe
wha
ate
Oe
eed
Behe
16
7.
10.
Main
PC
Bi
Ass’
si
Scares:
«
lead
deal
oda
Wo
wide
ee
bee
OO
ee
ash
Mate
Ape
ole
A
Natu
Mota
sod
Se
17
Schematic!
Diagtant
s,s.
5
soo
2
sires
an
ere
Bh
woke
vee
bob
GH
Elander
ates
REE
Oo
Wee
eave
Wa
aioe
Cae
ia
ache
tes
bo
19
8.
1.
I€
Block:
Diagrams...
032i
a)a
aise
48
a
a
peo
ere
a
Soa
B
Huy
does
wa
ga
old
bral
are
Wee aoa
19
8.
2.
Schematic
Diagram
.........
0.
cc
ce
ee
ee
eee
teen
ee
cece
nent
en
naaea
20
Wiring
Diagranni
>:
,.0..6
sie
feet
ed
ite
hot
bin
Talay
Bobo
ds
SAR
Bw
aor
Re
wire
bof
ah
bln
au
Ele
eS
Slav
acta
be
nw
Doe
Qoasans.
Godel
21
Block!
Diagrams’:
jc.
<c<feis.
fase.
cisco
Gatien
ale
wtay
ete.
Std
Oe
aha
ope
teies
«ay
Bar
EvaNGES,
gh
haouba
breceey
oeet
a
acieie
Rakdes
22
Timing
Chart
and
Eq.
Amp,
Frequency
Response
.............
000
cee
cece
eet
eee
e
een
eeennas
24
Specifications:
2
vi
see
esse
cess
puetiotn
vo
oe
olin
Bole
Rite
toolny
ca
ko
ee
erie
Aa
©
alata
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aN
oh
DEEN
GDA
aac
tas
Re
ee
eve
26
GENERAL
1.1.
Voltage
Selector
Voltage
selector
is
installed
on
the
rear
panel
for
Other
version
of
the
Nakamichi
BX-125.
This
voltage
selector can
select
either
120
V
or
220-240
V
at
customer’s
disposal.
1.2.
Packing
Materials
and
Owner’s
Manual
o
“
Part
No,
Description
Q
OFO3855A
Carton
Box
BX-125
(Silver)
OF03857A
Carton
Box
BX-125
(Black)
OFO3856A
Carton
Box
BX-125E
(Silver)
OFO3858A
Carton
Box
BX-125E
(Black)
OF03674C
=
Packing
0D04517A
Owner’s
Manual
(English)
0D04518A
Owner’s
Manual
(English/German/French)
0D04522A
Owner's
Manual
(Japanese)
HR
Dee
1.3.
Serial
Number
The
BX-125/BX-125E
has
two
versions,
Silver
and
Black.
In
the
service
manual,
serial
numbers
of
these
versions
are
identified
as
follows:
Silver
version:
A322xxxxx
Black
version:
A323xxxxx
However,
the
actual
serial
number
on
the
serial
number
plate
of
the
BX-125/BX-125E
is
indicated
as
A322.3xxxxx.
The
serial
number
begins
with
A322.301001.
ees
Sanath
2.
TEST
TAPES
AND
GAUGES
(1)
400
Hz
Level
Tape
(DA09005B)
(2)
1
kHz
Track
Alignment
Tape
(DA09007B)
(3)
15
kHz
Azimuth
Tape
(DA09004B)
(4)
3
kHz
Speed
and
Wow/Flutter
Tape
(DA09006C)
(5)
10
kHz
PB
Frequency
Response
Tape
(DA09003B)
(6)
15
kHz
PB
Frequency
Response
Tape
(DA09002B)
(7)
20
kHz
PB
Frequency
Response
Tape
(DA09001B)
(8)
Tape
Travelling
Cassette
(DA09027B)
(9)
Reference
EXII
Tape
(DAO9066B)
(10)
Reference
SX
Tape
(DA09025B)
(11)
Reference
SX-E
Tape
(DA09086A)
(12)
Reference
ZX
Tape
(DA09037B)
(13)
Head
Alignment
Gauge
(DA09092A)
3.
MECHANICAL
ADJUSTMENTS
3.1.
Tape
Guide
Height
Check
for
Record/Playback
Head
and
Erase
Head
With
use
of
a
Head
Alignment
Gauge,
tape
guide
height
check
for
the
Record/Playback
and
Erase
Heads
shall
be
made,
wherein
a
small
block
shall
be
pushed
straight
down
to
the
base
while
in
use
of
the
Head
Alignment
Gauge.
Refer
to
Fig.
3.1.
(1)
Record/Playback
Head
Tape
Guide
Height
(a)
Load
the
base
of
the
Head
Alignment
Gauge
carefully
and
set
the
cassette
deck
in
Play
mode.
(b)
Place
the
small
block
of
the
Head
Alignment
Gauge
on
the
base.
(c)
Slide
the
small
block
against
the
tape
guide
of
the
Record/
Playback
Head,
and
check
to
insure
that
the
block
is
ac-
cepted
by
the
tape
guide,
(d)
If
not,
loosen
the
screw
and
insert
a
shim
(either
30
um
(0C80048A),
60
um
(0C80038A),
or
100
um
(0C80039A))
to
raise
the
Record/Playback
Head,
then
tighten
and
apply
a
quantity
of
lock
tight
paint
to
the
screw.
(2)
Erase
Head
Tape
Guide
Height
(a)
Load
the
base
of
the
Head
Alignment
Gauge
carefully
and
set
the
cassette
deck
in
Play
mode.
(b)
Place
the
small
block
of
the
Head
Alignment
Gauge
on
the
base,
(c)
Slide
the
small
block
against
the
tape
guide
of
the
Erase
Head,
and
check
whether
the
block
is
accepted
by
the
tape
guide,
3.2,
Head
Base
Stroke
Check
Refer
to
Fig.
3.2.
{1)
Load
the
base
of
the
Head
Alignment
Gauge
carefully,
then
push
the
base
toward
the
Record/Playback
Head
to
eliminate
the
clearance
between
the
reference
pin
and
the
base.
(2)
Set
the
cassette
deck
in
Play
mode.
(3)
Place
the
small
block
of
the
Head
Alignment
Gauge
on
the
base,
(4)
Contact
the
small
block
with
the
Record/Playback
Head
surface
and
the
Erase
Head
surface,
and
check
whether
the
end
of
the
small
block
is
located
within
the
specified
toler-
ance
as
shown
in
Fig.
3.2,
3.3.
Record/Playback
Azimuth
Alignment
and
Height
Check
Refer
to
Fig.
3.1.
(1)
Connect
a
VTVM
to
the
Output
Jacks,
(2)
Load
a
15
kHz
Azimuth
Tape
and
set
the
cassette
deck
in
Play
mode,
(3)
Turn
the
Azimuth
Alignment
Screw
until
the
outputs
of
both
channels
become
maximum.
(4)
Load
a
1
kHz
Track
Alignment
Tape
and
set
the
cassette
deck
in
Play
mode,
(5)
Check
to
insure
that
the
readings
of
both
channels
on
the
VTVM
are
below
—25
dB.
If
not,
replacement
of
the
Record/Playback
Head
will
be
required.
(6)
Apply
a
quantity
of
lock
tight
paint
to
the
Azimuth
Align-
ment
Screw,
Shim
3.4.
Pressure
Adjustment
of
Pressure
Roller
Refer
to
Fig.
3.3.
(1)
In
Play
mode,
measure
the
torque
of
the
Pressure
Roller
and
check
whether
the
torque
is
in
a
range
of
320
+50
g-cm.
(2)
If
torque
is
out
of
the
range,
correct
it
by
changing
the
instal-
lation
point
of
the
Pressure
Roller
Spring.
3.5.
Tape
Travelling
Check
Load
a
Tape
Travelling
Cassette
and
set
the
cassette
deck
in
Play
mode
to
check
the
followings:
(1)
After
more
than
2
seconds,
the
fluctuation
of
the
tape
travel-
ling
on
the
Record/Playback
Head
is
small.
(2)
Tape
is
in
contact
with
the
head
sufficiently.
(3)
Tape
waving
is
small
on
the
heads
and
pressure
roller,
3.6.
Eject
Damper
Adjustment
Refer
to
Fig.
3.4,
Load
a
cassette
tape,
and
with
opening
the
Cassette
Case
by
pressing
the
Eject
button
and
closing
it
by
hand,
adjust
the
speed
of
damper
action
by
the
Damper
Adjustment
Screw.
CCW:
Damper
moves
fast.
CW:
Damper
moves
slowly.
3.7,
Reel
Motor
Speed
Adjustment
in
Play
Mode
(1)
To
warm-up
the
cassette
deck,
load
a
C-60
cassette
tape
and
set
the
cassette
deck
in
Play
mode.
(2)
After
more
than
four
minutes,
load
a
torque
meter
TW-211
(made
by
Sony)
and
set
the
cassette
deck
in
Play
mode.
(3)
Adjust
VR601
on
the
Main
P.C.B.
Ass’y
to
obtain
exactly
50
g-cm
on
the
torque
meter.
3.8.
Tape
Speed
Adjustment
Refer
to
Fig.
3.5.
(1)
Connect
a
frequency
counter
to
the
Output
Jacks.
(2)
Load
a
3
kHz
Speed
and
Wow/Flutter
Tape
and
play
it
back,
(3)
Adjust
the
Tape
Speed
Adjustment
Volume
incorporated
in
the
Capstan
Motor
to
obtain
3,000
Hz
on
the
frequency
counter,
CCW:
Motor
drives
slowly.
CW:
Motor
drives
fast.
3.9.
Lubrication
The
tape
transport
is
of
a
lubrication-free
type
mechanism.
When
the
following
parts
are
replaced,
apply
the
specified
lubricant,
(1)
Molykote
(R)
Grease
(X5-6020)
Cam
Motor
Pulley
Thrust
portion
on
the
Capstan
Shaft
(2)
FLOIL
GB-TS-1
Washer
between
Reel
Hub
Ass’y
and
Back
Tension
Spring
(8)
Diamond
Oil
(EP56)
Reel
Hub
Shaft
(4)
Anderol
456
Capstan
Shaft
Note:
We
suggest
that
you
use
the
above
specified
lubricant
or
equivalent
type.
The
company
dealing
in
the
above
lubricant
is
as
follows:
(a)
Molykote
(R)
Grease
(X5-6020)
Dowcorning
Co.,
Ltd.,
1-15-1
Nishishinbashi,
Minato-
ku,
Tokyo,
Japan
(b)
FLOIL
GB-TS-1
Kanto
Chemicals
Co.,
Ltd.,
2-7
Kanda
Sakuma-cho,
Chiyoda-ku,
Tokyo,
Japan
(c)
Diamond
Oil
(EP-56)
Mitsubishi
Oil
Co.,
Ltd.,
1-2-4
Toranomon,
Minato-ku,
Tokyo,
Japan
(d)
Anderol
456
Toyo
Kokusai
Oil
Co.,
Ltd.,
3-3-5
Hatchobori,
Chuo-
ku,
Tokyo,
Japan
Fig.
3.3
‘4
Increase
Damper
Adjustment
Screw
Fig.
3.4
Decrease
N
Increase
Fig.
3.5
4,
PARTS
LOCATION
FOR
ELECTRICAL
ADJUSTMENT
Main
P.C.B.
®
free
eo
Level
VR1I08
VR208
io)
(o)
MPX
iflter
vR6ol
Reel
Motor
Speed
VRIO4
VRI03
VRIO2
{Play}
EX
Rec.
Cal.
Sx zx
Playback
Level
VR204 VR203
VR202
@
oo
F102
TP103
(o)uss
Bias
Trap
(Record)
Peaking
TP203
TP102
pee
L203
TP202
T301
@
Bias Osc.
Frequency
A317
Bi
=
jas
ut
VR105
VRI06
VRIO7
U3
aee
VR205 VR206
VR207
Tape
Switch
P
C.B.
Fig.
4
5.
ELECTRICAL
ADJUSTMENTS
Note:
Electrical
adjustment
should
be
performed
after
mechanical
adjustment
is
completed.
5.1.
Adjustment
Instructions
OUTPUT
CONNECTION
Playback
Eq.
-
70
ys
Adjust
the
volume
incorporated
in
the
capstan
motor
to
obtain
3
kHz
+0.5%
on
the
frequency
counter.
Frequency
Counter
to
Output
Jacks
Tape
Speed
Adjustment
1.
Feed
in
400
Hz
and
adjust
the
Input
Level
controls
to
obtain
350
mv
-0.8
dB
on
the
VIVM.
2.
Adjust
VR108
(VR208)
so
that
the
0
dB
segment
of
the
level
meter
starts
illuminating.
3.
Adjust
the
Input
Level
controls
to
obtain
350
mV
on
the
VIVM,
then
decrease
the
generator
output
level
by
20
dB.
4.
Check
to
insure
that
the
segment
for
-20
dB
illuminates.
VIVM
to
TP101,TP201
on
Main
P.C.B.
Meter
Level|400
Hz
to
Record,
Pause/Main
Calibration]
Input
Jacks
Set
the
Output
Level
control
to
max,
Adjust
the
Input
Level
controls
to
obtain
500
mV
(0
dB)
on
the
VTVM.
2.
Set
the
MPX
Filter
switch
to
ON
and
adjust
L105
(L205)
to
obtain
minimum
reading
on
the
VIVM
(minimum
reading
will
be
less
than
-30
dB).
Record,
Pause|Main
MPX
-
OFF/ON
|P.C.B.
19
kHz
+100
Hz
to
Input
Jacks
MPX
Filter
Adjustment
Adjust
the
Record/Playback
Head
Azimuth
Alignment
Screw
to
obtain
maximum
readings
for
both
channels
on
the
VTIVM.
VIVM
to
Output
Jacks
Playback
Eq.
-
70
ps
Dolby
NR
-
OFF
MPX
-
OFF
Record/
Playback
Head
Azimuth
Alignment
Adjust
VR101
(VR201)
to
obtain
350
mV
on
the
VIVM.
VTIVM
to
Same
as
above|Main
TP101,TP201
on
Main
P.C.B.
400
Hz
Level
Tape
Playback
Level
Calibration
-
Load
a
400
Hz
level
tape
and
play
it
back,
Adjust
the
Output
Level
control
toa
certain
level.
2.
Load
10
kHz,
15
kHz and
20
kHz
PB
400
Hz
Same
as
above
|Main
Level
Tape|
Output
10
kHz
PB
|
Jacks
Frequency
Response
Playback
Frequency
Response
Adjustment
Tape
frequency
response
tapes
and
play
15
kHz
PB
them
back,
Adjust
the
record/play-
Frequency
back
head
azimuth
to
obtain
maximum
Response
readings
for
both
channels
on
the
Tape
VTIVM
with
each
tape.
20
kHz
PB
Short
R110
(R210)
or
R195
(R295)
on
Frequency
the
Main
P.C.B.
Ass'y
to
obtain
the
Response
following
levels
against
the
lewel
for
Tape
the
400
Hz
level
tape.
10
kHz:
-20
dB
-2
to
+2
dB
15
kHz:
-20
dB
-2
to
+3
dB
20
kHz:
-20
dB
-2
to
+4
dB
3.
Conduct
step
4
"Record/Playback
Head
Azimuth
Alignment".
STEP
ITEM
picasras
pena
REMARKS
pemecriiae
7
|Bias
Frequency
|Record,
Pause
Tape
-
Connect
an
additional
0.1
ohm
resistor
Oscillation
Counter
to
|Tape
-
ZX
in
series
to
the
Erase
Head
and
Frequency
CN2-2
on
Eq.
-
70
ps
-C.
connect
a
VIVM
across
it.
and
Erase
Tape
Switch]
Dolby
NR
-
2.
Adjust
T301
to
obtain
105
kHz
on
the
Current
P.C.B.
OFF
frequency
counter,
Adjustment
and
MPX
-
OFF
3.
Check
the
erase
current
by
the
VTVM.
310
mA
to
400
mA
(typically
approx.
VIVM
across
Erase
current
will
be
in
a
range
of
350
mA).
the
additional
0.1
ohm
If
erase
current
is
not
sufficient,
resistor increase
it
by
shorting
either
R318
or
R350.
4.
After
completion
of
the
erase
current
adjustment,
re-check
the
bias
oscillation
frequency,
5.
Remove
the
additional
0.1
ohm
resistor,
21
kHz
VIVM
to
Same
as
above|/Main
Short
the
bias
cut
points
indicated
in
Record
Amplifier
|(-20
dB)
|TP102,TP202
-C.B.
Fig.
4
with
a
clip
to
stop
bias
Equalizer
to
Input
on
Main
oscillation,
Adjustment
|
Jacks
P.C.B.
2.
Adjust
L102
(L202)
to
obtain
peak
reading
at
21
kHz
on
the
VIVM.
Remove
the
clip.
Adjust
L103
(L203)
to
obtain
maximum
reading
on
the
VTVM.
Bias
Trap
|None
VIVM
to
Same
as
above
Adjustment
|
(remove
TP103
,TP203
(Record
input
on
Main
Amp.)
signals)
|P.C.B.
Record
400
Hz
VIVM
and
Record
and
Adjustment
should
be
made
in
the
order
of
Level
(0
dB)
and}
Distortion
|Playback
ZX,
SX
and
EX.
Calibration|15
kHz
Meter
to
Tape
-
ZX/SX/|
(Level)
and
(-20
dB)
Output
EX
ZX:
1.
Set
the
Output
Level
control
to
max.
Recording
to
Input
|
Jacks
Eq.
-
70
ps
VR102
2.
Set
the
cassette
deck
in
Record/Pause
Bias
Jacks
(ZX/SX)
mode,
Current
120
ps
3.
Feed
in
400
Hz
and
adjust
the
Input
Adjustment
(EX)
Level
controls
to
obtain
500
mV
Dolby
NR
-
(O
dB)
on
the
VTVM.
OFF
4.
Load
a
reference
ZX
tape,
reference
MPX
-
OFF
SX/SX-E
tape
and
reference
EXII
tape.
5.
Feed
in
400
Hz
(0
dB)
and
record,
rewind
and
play
it
back.
Adjust
VR102
(VR202)
for
ZX
tape,
VR103
(VR203)
for
SX/SX-E
Tape
and
VR104
(VR204)
for
EXII
tape
so
that
the
played
back
output
levels
are
500
mV
(0
dB)
on
the
VTVM.
Feed
in
15
kHz
(-20
dB)
and
record,
rewind
and
play
it
back.
Adjust
VR105
(VR205)
for
ZX
tape,
VR106
(VR206)
for
SX/SX-E
tape
and
VR107
(VR207)
for
EXII
tape
so
that
the
played
back
output
levels
are
50
mV
(-20
dB)
on
the
VIVM.
7.
Repeat
above
5
and
6
two
or
three
times.
8.
Feed
in
400
Hz
(0
dB)
and
record,
rewind
and
play
it
back.
Check
to
insure
whether
the
total
harmonic
distortion
is
less
than
1.0%
for
ZX
and
EXII
tapes
and
1.2%
for
SX/SX-E
tape.
If
the
total
harmonic
dis-
tortion
exceeds
the
specified
value,
repeat
above
steps
till
satisfactory
results
are
obtained.
Switch
P.C.B.
(Bias)
a
ITEM
SIGNAL
OUTPUT
MODE
ADJUST~
SOURCE
CONNECTION
MENT
Overall
400
Hz
Record
and
Set
the
cassette
deck
in
Record/Pause
Frequency
|
(0
dB)
and|
Output
Playback
mode.
Response
20
Hz
to
Tape
-
ZX/SX/|
L102
Feed
in
400
Hz
and
set
the
Input
Level
Adjustment
|17
kHz
EX
controls
to
obtain
500
mV
(0
dB)
on
(-20
dB)
Eq.
-
70
ps
the
VIVM.
to
Input
(2X/SX)
Decrease
the
generator
output
control
Jacks
120
ps
by
20
dB.
(EX)
Feed
in
20
Hz
to
17
kHz
(-20
dB),
and
Dolby
NR
-
record,
rewind
and
play
them
back,
OFF
then
check
to
insure
whether
the
out-
MPX
SW
-
OFF
put
levels
are
within
-20
dB
+4
dB.
.
If
above
is
not
sufficient,
adjust
L102
(L202)
to
obtain
approx.
~20
dB
on
the
VIVM,
then
conduct
step
10
"Record
Level
Calibration
and
Recording
Bias
Current
Adjustment".
If
above
is
not
sufficient,
precise
re-adjustment
of
step
6
"Playback
Frequency
Response",
replacement
of
Record/Playback
Head
or
tape
travel-
ling
check
will
be
required.
5,2,
Playback
Frequency
Response
Adjustment
Figs.
5.1
and
5.2
show
the
playback
amp.
circuit
for
adjustment
The
peaking
portion
of
the
equalization
curve
compensates
the
and
the
playback
equalization
curve.
gap
loss
of
the
playback
head,
Peaking
level
is
varied
by
the
short
This
adjustment
will
be
required
if
playback
level
is
not
sufficient
circuit
of
R110
(R210)
or
R195
(R295).
when
a
20
kHz
PB
frequency
response
tape
is
played
back.
R
RIO
RI9S
(R210)
(R295)
680
1K
R/P
Head
VRIOt
[VR201)
Output
390P
HI
C108
(C208)
1000P
+H
C107
(C207)
120y8
Fig.
5.1
GAIN
(dB)
FREQUENCY
(Hz)
Fig.
5.2
6.
MECHANISM
ASS’Y
AND
PARTS
LIST
6.1.
Synthesis
01
HA04494B
0H04582B
0H04583B
0304628A
0H04306A
0H04240A
HA04571A
OJ04765A
OH04276A
0H04432B
0OHO3737A
0H04155B
0M04377B
0J04629A
0J04762A
OJ03564A
OE03054A
OE03033A
OEO0868A
OEOO865A
Description
Synthesis
Serial
No.:
432201001
-
(Silver)
Cassette
Case
Cover
Ass’y
Front
Panel
Ass’y
BX-125
Front
Panel
Ass’y
BX-125E
Top
Cover
Cushion
(Front)
Meter Cover
LED
Lens
Eject
Button
Ass’y
Spring
Counter
Escutcheon
Volume
Knob
Volume
Knob
Base
Top
Cover
Caution
Label
Top
Cover
Cushion
(Back)
Synthesis
Mechanism
Ass’y
Bottom
Cover
Leg
T-H
BT
3x8
©
Countersunk
BT
4x8
©
Pan
Washer-faced
(Nickel)
BT
3x8
©
Binding
BT
3x10
©
Binding
Fig.
6.1
PAT
PP
RPE
NN
BHP
PEN
ee
HA04495B
0H04584B
0H04585B
0J04628A
0HO04307A
0H04240A
HA04570A
OJO4765A
OH04275A
0H04342A
OHO3737A
0H04156B
0M04377B
0J04629A
0J04762A
0J03564A
OE03054A
0E03032A
OEOO868A
OEO00865A
Synthesis
Serial
No.:
A32301001
-
(Black)
Cassette
Case
Cover
Ass’y
Front
Panel
Ass’y
BX-125
Front
Panel
Ass’y
BX-125E
Top
Cover
Cushion
(Front)
Meter
Cover
LED
Lens
Eject
Button
Ass’y
Spring
Counter
Escutcheon
Volume
Knob
Volume
Knob
Base
Top
Cover
Caution
Label
Top
Cover
Cushion
(Back)
Synthesis
Mechanism
Ass’y
Bottom
Cover
Leg
T-H
BT
3x8
6
Countersunk
BT
4x8
©
Pan
Washer-faced
(Black
Chromate)
BT
3x8
©
Binding
BT
3x10
&
Binding
PWD
PPR
EEN
Re
Hee
Hee
6.2,
Synthesis
Mechanism
Ass’y
(AO1)
Schematic
Ref,
No.
OH04277A
HAO04794A
OHO4288A
BA05637A
0J04838A
BA05635A
0J04984A
BA05630A
OJO4767A
BAO5089A
0H04289A
0H04283B
0H04272A
0J04703A
0J04704A
BAO5639A
0J04840A
BA05638A
0H04274A
O0C08602A
0J04764A
O0C08604A
0H04309A
BA05641A
0304843A
BA05640A
OBO08511A
0J04611A
0H04290A
BA05230A
BA05231A
BA05229A
0M04196A
0H04154C
CA08498A
BA05131A
BAO5627A
BA02757A-E
0J04603F
0J04773D
HA04759B
HAO04791A
HAO04760A
HAO4761A
HA04771B
HA04758A
HA04762A
OBO851i5A
0J04581A
OB08525A
OBO8854A
0B08347U
0M04131B
0B08349B
OEO0868A
OEOO766A
OE03074A
OEOO857A
OBO8583A
OE00859A
OE03070A
OEO00835A
OE00824A
OE00954A
0E03028A
Description
Synthesis
Mechanism
Ass’y
Serial
No.:
A32201001
-
(Silver)
Meter
Scale
Front
Chassis
Ass’y
Push
Switch
Button
Tape
Switch
P.C.B.
Ass’y
Holder
Dolby
NR
Switch
P.C.B.
Ass’y
Cushion
A
LED
P.C.B.
Ass’y
Memory
Switch
Holder
Indicator
Ass’y
Slide
Volume
Knob
Slide
Volume
Plate
Memory
Switch
Knob
Bushing
A
Bushing
B
Volume
P.C.B.
Ass’y
Indicator
P.C.B.
Holder
Indicator
P.C.B.
Ass’y
Counter
Knob
Tape
Counter
Counter
Holder
Counter
Belt
Slide
Switch
Knob
Timer
Switch
P.C.B.
Ass’y
Timer
Switch
P.C.B.
Holder
Control
Switch
P.C.B.
Ass’y
Headphone
Jack
Headphone
Plate
Power
Switch
Button
Power
Switch
P.C.B.
Ass’y
BX-125
(U.S.A.
&
Canada)
Power
Switch
P.C.B.
Ass’y
BX-125
(Japan)
Power
Switch
P.C.B.
Ass’y
BX-125
(Australia
&
Others)
&
BX-125E
Cassette
Label
(Silver)
Cover
Plate
Mechanism
Ass’y
Earth
Wire
Main
P.C.B.
Ass’y
BX-125
Main
P.C.B.
Ass’y
BX-125E
Side
Chassis
L
Side
Chassis
R
Rear
Panel
Ass’y
BX-125
(U.S.A.)
Rear
Panel
Ass’y
BX-125
(Japan)
Rear
Panel
Ass’y
BX-125
(Others)
Rear
Panel
Ass’y
BX-125
(Australia)
Rear
Panel
Ass’y
BX-125
(Canada)
Rear
Panel
Ass’y
BX-125E
(UK)
Rear
Panel
Ass’y
BX-125E
(220V
Class
2)
Insu-Lock
Counter
Cushion
Fuse
2A
250V
BX-125
(U.S.A.,
Canada
&
Others)
Fuse
2A
BX-125
(Japan)
Fuse
T1A
250V
BX-125
(Australia)
&
BX-125E
Fuse
Label
T1A
BX-125
(Australia)
&
BX-125E
Fuse
Clip
BX-125
(Australia)
&
BX-125E
BT
3x8
6
Binding
M3x8
©
Binding
BT
2.6x8
@
Binding
with
Toothed-
Lock
Washer
BT
3x6
©
Binding
Plastic
Rivet
Nut
Washer
BT
2.6x6
©
Binding
M2.6x6
©
Binding
BT
3x25
@Pan
BT
2.6x6
®
Pan
(Black
Chromate)
BT
2.6x8
©
Binding
BT
3x8
©
Binding
(Nickel)
BOHM
BER
eR
Ree
I
ee
ee
i
ee
ONT
PB
BP
NN
NWR
BHR
BEE
Be
Ree
eR
An
DD
Re
OO
et
To
10
0H04278B
HA04795A
0H04248A
BA05637A
OJ04838A
BA05635A
0J04984A
BA05630A
OJ04767A
BA05089A
0H04247B
0H04284B
OHO04271A
0J04703A
0J04704A
BA05639A
0J04840A
BA05638A
0H04273A
OC08602A
0J04764A
O0C08604A
0H04242A
BAO5641A
0J04843A
BA05640A
OBO8511A
0J04611A
0H04243A
BA05230A
BA05231A
BA05229A
0M04392A
0H04154C
CA08498A
BAO5131A
BA05627A
BA02757A-E
0J04603F
0J04773D
HA04764A
HAO04792A
HA04765A
HA04766A
HAO04772A
HA04763A
HAO4767A
OBO8515A
0304581A
OBO8525A
OB08854A
0B08347U
0M04131B
OBO8349B
OE00868A
OEOO766A
OE03074A
OEOO857A
OB08583A
OEOO859A
0E03070A
0E00835A
OE00824A
OE00954A
OE00921A
Description
Synthesis
Mechanism
Ass’y
Serial
No,:
A32301001
-
(Black)
Meter
Scale
Front
Chassis
Ass’y
Push
Switch
Button
Tape
Switch
P.C.B.
Ass’y
Holder
Dolby
NR
Switch
P.C.B.
Ass’y
Cushion
A
LED
P.C.B.
Ass’y
Memory
Switch
Holder
Indicator
Ass’y
Slide
Volume
Knob
Slide
Volume
Plate
Memory
Switch
Knob
Bushing
A
Bushing
B
Volume
P.C.B.
Ass’y
Indicator
P.C.B.
Holder
Indicator
P.C.B.
Ass’y
Counter
Knob
Tape
Counter
Counter
Holder
Counter
Belt
Slide
Switch
Knob
Timer
Switch
P.C.B.
Ass’y
Timer
Switch
P.C.B.
Holder
Control
Switch
P.C.B.
Ass’y
Headphone
Jack
Headphone
Plate
Power
Switch
Button
Power
Switch
P.C.B.
Ass’y
BX-125
(U.S.A.
&
Canada)
Power
Switch
P.C.B.
Ass’y
BX-125
(Japan)
Power
Switch
P.C.B.
Ass’y
BX-125
(Australia
&
Others)
&
BX-125E
Cassette
Label
(Gold)
Cover
Plate
Mechanism
Ass’y
Earth
Wire
Main
P.C.B.
Ass’y
BX-125
Main
P.C.B.
Ass’y
BX-125E
Side
Chassis
L
Side
Chassis
R
Rear
Panel
Ass’y
BX-125
(U.S.A.)
Rear
Panel
Ass’y
BX-125
(Japan)
Rear
Panel
Ass’y
BX-125
(Others)
Rear
Panel
Ass’y
BX-125
(Australia)
Rear
Panel
Ass’y
BX-125
(Canada)
Rear
Panel
Ass’y
BX-125E
(UK)
Rear
Panel
Ass’y
BX-125E
(220V
Class
2)
Insu-Lock
Counter
Cushion
Fuse
2A
250V
BX-125
(U.S.A.,
Canada
&
Others)
Fuse
2A
BX-125
(Japan)
Fuse
1AT
250V
BX-125
(Australia)
&
BX-125E
Fuse
Label
1AT
BX-125
(Australia)
&
BX-125E
Fuse
Clip
BX-125
(Australia)
&
BX-125E
BT
3x8
®
Binding
M3x8
@
Binding
BT
2.6x8
©
Binding
with
Toothed-
Lock
Washer
BT
3x6
@
Binding
Plastic
Rivet
Nut
Washer
BT
2.6x6
&
Binding
M2.6x6
©
Binding
BT
3x25
@
Pan
BT
2.6x6
@
Pan
(Black
Chromate)
BT
2.6x8
©
Binding
BT
3x8
@
Binding
(Black
Chromate)
1
BP
HP
BRB
REE
E
RP
EE Ee
e
ePeeENENDe
eP
ee
ba
wm
OC
WN
PB
FP
ND
NOR
HR
PPR
Pee
eRe
an
Re
PHD
HHO
HE
vo
6.3,
Mechanism
Ass’y
(B01)
Fig.
6.3
il
Schematic
Ref,
No.
CA08498A
CA80001A
0G01371A
OC80001A
0G01365A
0C80044A
0C80045A
0C80003A
0C80004A
OC
80005A
OC80006A
CA80002A
CA80003B
CA80004B
OC80007A
CA80005A
OC80008A
OC80009A
0C80010C
0C80043A
0C80012A
0C80013A
0C80014A
0C80015B
0C80016A
OC80017A
0C80018A
0C80019B
0C80020A
OC80021A
CA80006A
0C80022B
0C80023A
0C80024A
0C80025A
0C80026A
0C80027A
CA80007A
0C80028A
CA80011A
0C80029A
0C80030A
CA80008B
0C80031A
0C80033A
0C80034A
CA80009A
0C80035A
0C80036A
CA80010A
OC80037A
0C80040A
0C80041A
0C80042A
0C80635B
0C80046A
OE03038A
0E03053A
0C80048A
0C80038A
0C80039A
OE03046A
0E03042A
0E03049A
OE03050A
0E00222A
0E03043A
OEO0698A
OE03052A
0E00181A
0E03048A
0E03036A
0E03044A
OEOO691A
OE03045A
OE03051A
OE03037A
0£03047A
OE03041A
OE03040A
0E03035A
OE03245A
Description
Mechanism
Ass’y
Serial
No.:
A322.301001
-
Cassette
Case
Ass’y
Record/Playback
Head
RP-2G
Azimuth
Adjust
Spring
Erase
Head
E-2D
Erase
Head
Collar
Record/Play
back
Head
Collar
Head
Base
Hold
Plate
Steel
Ball
3mm
Reinforcement
Plate
Head
Base
Brake
Ass’y
Take-up
Reel
Hub
Ass’y
Supply
Reel
Hub
Ass’y
Steel
Ball
2mm
Pressure
Roller
Ass’y
Pressure
Roller
Spring
Cassette
Case
Spring
Cassette
Case
Holder
R
5P-H
Connector
Eject
Sensor
Lock
Lever
Spring
Lock
Lever
Collar
Lock
Lever
Brake
Spring
Record
Protector
Lever
Cassette
Case
Holder
L
Eject
Spring
Eject
Lever
Spring
Eject
Lever
Pneumatic
Damper
Ass’y
Cassette
Hold
Spring
Mechanism
Chassis
Record
Protector
Record
Protector
Holder
Cam
Mode
Switch
Control
Motor
Ass’y
Control
Motor
Holder
Shut-off
P.C.B.
Ass’y
Back
Tension
Spring
Reel
Motor
Holder
Reel
Motor
Ass’y
Capstan
Flange
Fly
wheel
Capstan
Belt
Fly
wheel
Holder
Ass’y
Sleeve
Floating
Rubber
Capstan
Motor
Ass’y
Insu-Lock
2P-H
Connector
4P-H
Connector
9P-H
Connector
Idler
Pulley
Azimuth
Alignment
Screw
M2x12
©
Binding
Wire
Holder
Shim
0,.03T
Shim
0.06T
Shim
0.1T
M2.6x6
@
Pan
(2A)
FT
2.5x5
®Pan
Washer
1.8mm
Washer
3.1mm
E-Ring
2mm
FT
2.5x10
@
Pan
E-Ring
2.5mm
Stopper
Ring
2.4mm
E-Ring
3mm
FT
2.6x6
®@Pan
M2x4
©
Pan
(2A)
FT
2.5x20
©
Pan
M2x3
@
Pan
M2.6x3
®
Binding
Washer
2.5mm
M2x5
@
Pan
(2A)
M2.6x9
@
Pan
FT
2,5x4
®
Pan
FT
2.5x3,.5
@
Pan
M2x3.2
®
Truss
Mylar
Washer
1.3x3.3x0.3
1
1
1
1
2
1
1
1
1
1
1
1
1
3
1
1
1
1
1
1
L
1
1
1
1
1
1
1
1
1
1
1
1
1
1
3
1
1
1
3
1
a
1
1
1
1
3
3
1
3
1
1
1
1
1
3
1
HERP
N
WOH
RDN
He
Rh
eee
OO
12
6.4.
Rear
Panel
Ass’y
(B02)
05
Fig.
6.4
Schematic
Ref,
No.
Part
No,
Description
01
02
03
04
HA04759B
HA04771B
HAOA761A
HAO4791A
HA04760A
HA04758A
HA04762A
0HO4586A
0HO4587A
BAO5087A
(0B81001A)
(OE00037A)
0B50040A
0B50009B
0B50011B
0B50010B
0B08037U
OBO8351A
Rear
Panel
Ass’y
BX-125
(U.S.A.)
Rear
Panel
Ass’y
BX-125
(Canada)
Rear
Panel
Ass‘y
BX-125
(Australia)
Rear
Panel
Ass’y
BX-125
(Japan)
Rear
Panel
Ass’y
BX-125
(Others)
Rear
Panel
Ass’y
BX-125E
(UK)
Rear
Panel
Ass’y
BX-125E
(220V
Class
2)
Serial
No.:
A32201001
-
(Silver)
Rear
Panel
BX-125
Rear
Panel
BX-125E
4P
Pin
Jack
Ass’y
(Consists
of
the
followings)
(4P
Pin
Jack)
(Earth
Lug)
Power
Transformer
BX-125
(U.S.A.
&
Canada)
Power
Transformer
BX-125
(Australia)
&
BX-125E
Power
Transformer
BX-125
(Japan)
Power
Transformer
BX-125
(Others)
Cord
Bushing
C
BX-125
(U.S.A.,
Australia,
Others
&
Japan)
&
BX-125E
(220V
Class
2)
Cord
Bushing
4K-4
BX-125
(Canada)
&
BX-125E
(UK)
aA
Be
we eB
Bee
Bp
a
13
Schematic
Ref.
No,
06
07
08
09
LO1
LO2
L03
L04
02
03
04
05
06
07
08
09
LO01
LO2
LO3
L04
LO5
Part
No.
0B08533A
OB08504A
0B05241A
0B08219B
0B08348A
0B08093U
0J04622B
0OM04407A
0B07092U
0C01162B
OE03028A
0E03034A
OE00897A
0B08583A
OEOO637A
OE03031A
HA04764A
HA04772A
HAO4766A
HA04792A
HAO4765A
HA04763A
HAO4767A
0H04588A
0H04589A
BAO5087A
(0B81001A)
(0£00037A)
0B50040A
0B50009B
0B50011B
0B50010B
0B08037U
0B08351A
OB08533A
OB08504A
OB05241A
OB08219B
0B08348A
0B08093U
0J04601B
OM03948A
0B07092U
0C01162B
OE00921A
0E03034A
OEOO907A
OB08583A
OE00637A
0E00818A
Description
Power
Cord
BX-125
(U.S.A.
&
Others)
Power
Cord
BX-125
(Canada)
Power
Cord
BX-125
(Australia)
Power
Cord
BX-125
(Japan)
Power
Cord
BX-125E
(UK)
Power
Cord
BX-125E
(220V
Class
2)
Switch
Cover
BX-125
(U.S.A.,
Canada,
Australia
&
Japan)
&
BX-125E
Voltage
Lock
Plate
BX-125
(Others)
Voltage
Selector
BX-125
(Others)
Bolt
Receptacle
Plate
BX-125
(U.S.A.
&
Canada)
BT
3x8
©
Binding
(Nickel)
M4x8
©
Binding
(Nickel)
BX-125
(U.S.A.
&
Canada)
ST
4x8
©
Binding
(Nickel)
BX-125
(Australia,
Others
&
Japan)
&
BX-125E
Plastic
Rivet
Washer
3.3x7x0.5
M3x8
©
Binding
(Nickel)
BX-125
(Others)
Rear
Panel
Ass’y
BX-125
(U.S.A.)
Rear
Panel
Ass’*y
BX-125
(Canada)
Rear
Panel
Ass’y
BX-125
(Australia)
Rear
Panel
Ass’y
BX-125
(Japan)
Rear
Panel
Ass’y
BX-125
(Others)
Rear
Panel
Ass’y
BX-125E
(UK)
Rear
Panel
Ass’y
BX-125E
(220V
Class
2)
Serial
No.:
A32301001
-
(Black)
Rear
Panel
BX-125
Rear
Panel
BX-125E
4P
Pin
Jack
Ass’y
(Consists
of
the
followings)
(4P
Pin
Jack)
(Earth
Lug)
Power
Transformer
BX-125
(U.S.A.
&
Canada)
Power
Transformer
BX-125
(Australia)
&
BX-125E
Power
Transformer
BX-125
(Japan)
Power
Transformer
BX-125
(Others)
Cord
Bushing
C
BX-125
(U.S.A.,
Australia,
Others
&
Japan)
&
BX-125E
(220V
Class
2)
Cord
Bushing
4K-4
BX-125
(Canada)
&
BX-125E
(UK)
Power
Cord
BX-125
(U.S.A.
&
Others)
Power
Cord
BX-125
(Canada)
Power
Cord
BX-125
(Australia)
Power
Cord
BX-125
(Japan)
Power
Cord
BX-125E
(UK)
Power
Cord
BX-125E
(220V
Class
2)
Switch
Cover
BX-125
(U.S.A.,
Canada,
Australia
&
Japan)
&
BX-125E
Voltage
Lock
Plate
BX-125
(Others)
Voltage
Selector
BX-125
(Others)
Bolt
Receptacle
Plate
BX-125
(U.S.A.
&
Canada)
BT
3x8
®
Binding
(Black
Chromate)
M4x8
@
Binding
(Black
Chromate)
BX-125
(U.S.A.
&
Canada)
ST
4x8
©
Binding
(Black
Chromate)
BX-125
(Australia,
Others
&
Japan)
&
BX-125E
Plastic
Rivet
Washer
3.3x7x0.5
M3x8
©
Binding
(Black
Chromate)
BX-125
(Others)
an
BP
He
BR
Re
Be
RR
HB
Ree
Nu
NN
NF
FH
Br
tee
BH
Ree
ee
Be LY
nv
N
NE
eS
NR
Q'ty
wh
7.
MOUNTING
DIAGRAMS
AND
PARTS
LIST
Notes:
1,
Mounting
diagram
shows
a
dip
side
view
of
the
printed
circuit
board.
2.
Diode
is
18853,
181555,
or
1SS176
unless
otherwise
specified.
3.
Following
transistors
are
interchangeable
with
each
other.
a.
2SA733,
2SA608SP,
2SA1048,
2SA1175:
b.
28C945,
2SC536SP,
28C
2458,
28C2785
4,
Abbreviation
for
part
name:
TR
—
Transistor,
SiD
—
Silicon
Diode,
ZD
—
Zener
Diode
RK
—
Carbon
Resistor,
RM
—
Metal
Film
Resistor,
RF
—
Fail
Safe
Type
Resistor
CE
—
Electrolytic
Capacitor,
CM
—
Mylar
Capacitor,
CC
—
Ceramic
Capacitor,
CP
—
PP
Capacitor,
CT
—
Tantalum
Capacitor,
CF
—
Film
Capacitor,
C
—
Mica
Capacitor
7.1,
Power
Switch
P.C.B.
Ass’y
AC
Input
BLK
to
Power
Transtormer
to
Power
Transformer
Fig.
7.1
7.2,
LED
P.C.B.
Ass’y
LED302
C-Type
Fig.
7.2
Schematic
;
Schematic
meh
me
BA05626A
|
Set
P.C.B.
Ass’y
BX-125
Main
P.C.B.
Ass’y
BX-125
LED
P.C.B.
Ass’y
Dolby
NR
Switch
P.C.B.
Ass’y
Tape
Switch
P.C.B.
BA05627A
BA05630A
BA05635A
BA05637A
Ass’y
BA05638A
|
Indicator
P.C.B.
i
Ass’y
BA05639A
|
Volume
P.C.B.
Ass’y
BA05640A
|
Control
Switch
P.C.B.
Ass’y
BA05641A
|
Timer
Switch
P.C.B.
Ass’y
BA05626A-E/
Set
P.C.B.
Ass’y
BX-125E
1
BA05627A-E|
Main
P.C.B.
Ass’y
:
BX-125E
i
BA05630A
|
LED
P.C.B.
Ass’y
BA05635A
|
Dolby
NR
Switch
P.C.B.
Ass’y
BA05637A
|
Tape
Switch
P.C.B.
BA05638A
Ass’y
Indicator
P.C.B.
BA05639A
BA05640A
Ass’y
Volume
P.C.B.
BAO5S641A
Ass’y
Control
Switch
P.C.B.
Ass’y
Timer
Switch
P.C.B.
Ass’y
LED302
7.3.
Timer
Switch
P.C.B.
Ass’y
7.4.
Shut-off
P.C.B.
Ass’y
De
pe
BA05230A
|
Power
Switch
P.C.B.
Ass’y
BX-125
(U.S.A.
&
Canada)
Power
Switch
P.C.B.
Ass’y
BX-125
(Japan)
Power
Switch
P.C.B.
Ass’y
BX-125
(Australia
&
Others)
&
BX-125E
Power
Switch
P.C.B.
Power
Switch
Spark
Killer
BX-125
(U.S.A,
&
Canada)
Spark
Killer
BX-125
(Japan)
Spark
Killer
BX-125
(Australia
&
Others)
&
BX-125E
Spark
Killer
Cover
BX-125
(Australia
&
Others)
&
BX-125E
BA05231A
BA05229A
0B02573D
0B70002A
0B08342A
0B08363A
OB08445A
0B90059A
0J04763A
|
Power
Switch
Holder
(1)
M38x6
@
Pan
(2A)
(2)
(2)
LED
P.C.B.
Ass’y
0E00612A
0E00752A
BA05630A
Eyelet
2x3
OB60183A
0B06333A
OB81065A
0B82116B
LED
P.C.B.
LED
Red
TLR124A
Wire
Mate
2P
(1)
Ribbon
Cable
2P(1)
14
Fig.
7.3
“ie
Shut-dt
Pulse
to
Logic
Port
tev
Fig.
7.4
Schematic
Ref.
No.
BAO5641A
OB60189A
OBO9687A
OBO7437A
0B81011A
CA80011A
O0C80047A
OB06388A
OB06389A
OB09840A
OB09841A
Desuiption
Timer
Switch
P.C.B.
Ass’y
Timer
Svitch
P.C.B.
RK
2.7x
1/6WJ
Slide
Switcha
2-3
(1)
Dip
Mate4P
Shut-off
?.C.B.
Ass’y
Shut-off
?.C.B.
TR
2802812
Photo
Reflector
NJL5141
RK
680
Leadless
RK
18K
Leadless
7.5.
Dolby
NR
Switch
P.C.B.
Ass’y
LOLOy
is
7.7,
Control
Switch
P.C.B.
Ass’y
e
a
Bia,
1°
Ob
vaaci
['
Ofioxiars2”
Fig.
15
7.6.
Volume
P.C.B.
Ass’y
1.7
gees
Reo
2204]
:
501
S|
“WooP
OHbO
Bed
i
o-——-o
|
VM=26°°GNO;-W
0000-lo
6T
ol
ig
2
2
9)
L9_949
9;
W
GND
VM-25
Fig.
7.6
yt
Omen:
oe
R701150
VR301
R341
R361,362
SW
305/306
FC1,MD1
DM1
FC20/21
LED301
Cds301
VR110,210
R501,601
C501,601
$W601,602
FC8
VM25/26
FC17/VP32
FC20
Q701
Q702
LED701
703,704
LED702
705,706
D701,702
c701
SW701-708
Q304
VR105,107
205,207
VR106,206
R138,238
R139,239
BA05635A
OB60187A
0B30036A
0B01682A
OBO9677A
0B70027A
0B81010A
0B02349A
BA05639A
0B60186A
0B06333A
0B06325B
0B31002A
0B09733A
0B09282A
0B07462A
0B81011A
0B81012A
0B81002A
BA05640A
OB60188A
0B10026A
0B10039A
0B06334A
0B06333A
0B06181A
OB06398A
OBO9657A
OBO9667A
OBO09663A
0B09693A
OB09677A
OBO9701A
OBO5557A
0B70004A
0J04744A
BA05637A
0B60184A
OBO6069A
0B32010A
0B32009A
OB09653A
OBO9695A
OBO9707A
0B09705A
OB09263A
OBO09831A
OB09837A
0B09283A
0B09828A
0B01403A
0B41229A
OBO5796A
OBO09187A
0B81051A
0B81011A
0B81012A
0B81010A
OBO6688C
0B70005A
0J304768B
Dolby
NR
Switch
P.C.B.
Ass’y
Dolby
NR
Switch
P.C.B.
VR
10K
(A)x2
RK
6.8K
1/4WJ
RK
1K
1/6w
J
Push
Switch
2-Key
Dip
Mate
3P
(3)
JP
Connector
4P
(1)
Volume
P.C.B.
Ass’y
Volume
P.C.B.
LED
Red
TLR124A
Photocoupler
MCD7214F
Slide
VR
100K
(A)
RK
220K
1/6W
J
cc
100P
50V
K
Push
Switch
Dip
Mate
4P
(2)
Dip
Mate
5P
(1)
Dip
Mate
2P
(1)
Control
Switch
P.C.B.
Ass’y
Control
Switch
P.C.B.
TR
2SA933S
(Q,R,S)
TR
2SC1740S
(S,E)
LED
Green
TLG124A
LED
Red
TLR124A
SiD
18853
18S176
150
1/6WJ
390
1/6WJ
270
1/6w
J
4,71K
1/6W
J
1K
1/6W
J
10K
1/6WJ
0.015u
50V
J
Touch
Switch
4.3mm
LED
Reflector
(6)
Tape
Switch
P.C.B.
Ass’y
Tape
Switch
P.C.B.
TR
2SB564
(L,M)
Semi-fixed
VR
47K
Semi-fixed
VR
22K
RK
10
1/6w
J
1/6w
J
1/6W
J
1/6w
J
1/4w
J
1w
Jd
10
1w
J
220P
50V
K
8200P
100V
J
47
16V
1500P
100V
J
0.047
50V
J
1p
16V
(BP)
2P-S
Post
ql)
Dip
Mate
4P
(2)
Dip
Mate
5P
ql)
Dip
Mate
3P
(1)
Bias
Ose.
Unit
(1)
Push
Switch
eS
(1)
Earth
Plate
A
(1)
Schematic
Ref.
No.
IC301
1¢701
Q704
ZD701,702
D301,302
D703-706
R301
R302
R303
R304
R305-314
R701
R702,703
704,709
711,715
R705
FC18/19
ne
ya
BAO5638A
|
Indicator
P.C.B
Ass’y
OB60185A
|
Indicator
P.C.B.
OBO06369A
|
IC
TA7612AP
0B11031A
|
IC
TLO92
0B06013A
|
TR
2SA733
(P,Q)
OB06191A
|
ZD
2.7V
RD2.7E
0B06181A
|
SiD
1SS53
OB06398A
iD
1SS176
(4)
0B01888A
10K
1/4WJ
0B01887A
:
1/4W
J
0B01857A
1/4W
J
OB09797A
1/4W
J
OB09681A
OB09677A
0B09725A
1/6w
J
0B09709A
1/6w
J
OBO9685A
:
1/6W
J
OB09701A
1/6W
J
0B09749A
1/6W
J
0B09737A
1/6w
J
OBO9717A
1/6W
J
0B09713A
1/6w
J
0B09281A
150P
50V
K
OB09868A
O.1u
50V
J
0B09163A
10u
16V
(BP)
0B81012A
|
Dip
Mate
5P
ql)
0B81011A
|
Dip
Mate
4P
(2)
OB02356A
|
JP
Connector
12P
ql)
16
7.8.
Tape
Switch
P.C.B.
Ass’y
7.9.
Indicator
P.C.B.
Ass’y
Fig.
7.8
Fig.
7.9
:
i
i
7.10.
Main
P.C.B.
Ass’y
t
i
i
|
eer
2
ee
|
{
|
“qtos
~RSG945.'U).,....
Paani
emma
F402
2A
250VITIA
250)
Clze
*
0-15
y
SOVILN)
‘Hho
Fig.
7.10
17
Schematic
b*]
7”
Zz
Q101,102
201,202
Q103,203
ZD301
D304
L101,201
VR101,201
R101,201
R102,103
202.203
R104,204
R105,205
R106,206
R107,207
R108,208
R109,209
R110,210
R111,211
R112,212
R195,295
R319
R357
C102,202
€103,203
C104,204
C105,205
C106,206
C107.207
C108,208
C304
C307
RL301
CN1
BAO05627A
—
PB
Eq.
Amp.
0B06142A
|
T
0B01872A
|
T
0B12168A
|
Z
0B01909A
|
SiD
0B03919C
0B32009A
0B09741A
0B09330A
OB05631A
0B09731A
OB09685A
0B09711A
0B22307A
OB22287A
OB09673A
0B01888A
0B09703A
OBO9677A
OB01857A
OB09725A
0B09137A
|
C
OB09283A
|
CC
0B01403A
|
C
0B01863A
|
C
0B05832A
|
C
0B41002A
(_C
OB05550A
|
CM
OBO9868A
|
C
0B01400A
|
C
0B90011A
0B02242A
1C303
Q104,204
L102,202
L103,203
R113,213
R114,214
R115,116
|
117,215
216,217
R118,218
R119,219
R120,220
R121,221
R122,222
R123,223
R125,225
R126,226
R153,253
110,210
111,211
112,212
C114,214
C115,215
C116,216
117,217
C126,226
C160,260
C161,261
1C305
Q112,212
VR102,202
VR103,104
203,204
R127,227
R128,228
R129,229
R130,230
R131,231
R132,135
137,232
235,237
R133,136
233,236
R134,234
R198,298
R
D
RD10TS-T1B2
181555
Inductor
36mH
Semi-fixed
VR
22K
RK
RK
470K
100K
180K
2.2K
27K
680
10K
12K
1K
a
Part
No.
Description
Main
P.C.B.
Ass’y
2SC2240
(BL)
R
2SC945L
(P,Q)
10V
1/6W
J
1/4w
J
(Noiseless)
82
1/4
1/6w
J
1/6w
J
1/6wW
J
4.87K
1/6W
F
3.32K
1/6W
F
1/6wW
J
1/4w
J
1/6W
J
1/6W
J
1/4W
J
1K
100K
1/6wWJ
E
22u
25V
(LN)
220P
50V
K
E
47
16V
E
3.34
50V
0.0184
50V
J
P
390P
100V
J
1000P
50V
J
F
0.iy
50V
J
—
Rec.
Eq,
Amp.
—
OBO06387A
OB06299A
OBO0068A
OBO6696A
0B09711A
OB09701A
OBO09677A
|
RK
0B09731A
OBO9691A
|
RK
OBO9665A
OBO9669A
0B09715A
|
R
OBO9697A
|
RK
OB05936A
|
RK
OB09741A
|
RK
0B01804A
0B40178A
OB01862A
|
CE
OBO5659A
0B41186A
0B01412A
|
CE
OBO9866A
|
C
OBO9815A
OBO09280A
OBO09187A
—
Rec,
Level
—
0B11027A
0B01872A
0B32009A
0B32008A
0B09705A
OB22327A
OBO9699A
OB01888A
OBO9707A
O0B09701A
OB05629A
OBO9677A
0B09709A
27K
10K
100K
1K
180K
3.9K
330
470
39K
6.8K
10
470K
15K
8.2K
10K
18K
10K
2.7K
1K
22K
100u
16V
DS
Relay
4P-T
Post
IC
NJM2043DD
TR
2S8C2878
Trap
Coil
10.5mH
L-C
Block
RK
RK
OB09725A
|
RK
1/6w
J
1/6w
J
1/6w
J
1/6w
J
1/6W
J
1/6w
J
1/6W
J
1/6W
J
1/6W
J
1/6w
J
1/4w
J
1/6W
J
8900P
50V
J
0.47
50V
22u
16V
5600P
50V
J
5100P
50V
J
10u
16V
0.068u
50V
J
47
6.3V
(KS)
47P
50V
J
1p
16V
(BP)
IC
TC9145P
TR
2SC945L
(P,Q)
Semi-fixed
VR
22K
Semi-fixed
VR
10K
1/6W
J
7.15K
1/6W
F
1/6wW
J
1/4W
J
1/6W
J
1/6w
J
1/4wW
J
1/6W
J
1/6W
J
ig
355
C121,221
C122,222
C123,223
1C101,201
1C
102,202
OB09725A
OB05571A
0B05843A
OBO5659A
OB09993A
0B01913A
0B06383A
OB06382A
0B10025A
ZD102,202
L104,204
L105,205
R154,193
254,293
R173,273
R174,274
R175,275
R176,276
R178,278
R180,280
R181,281
R182,282
R184,284
R185,285
R186,286
R187,190
287,290
R188,189
288,289
R191,291
R192,194
292,294
R196,296
R340
R358,359
R702,802
C132,134
232,234
C135,235
C136,236
C137,237
C138,140
154,238
C152,252
C153,253
C172,272
1C302
R152,252
R162,262
R163,263
C127,227
C129,229
Q105,106
205,206
30
VR108,208
OBO6167A
OB06691A
OBO6690A
0B05671A
OBO9687A
OB09688A
OBO9686A
OB22286A
0B22229A
0B09721A
0B22309A
OB22265A
0B22305A
OBOST17A
0B09722A
0B09737A
0B09739A
OBO09796A
OB09709A
0B09723A
0B09330A
OB09725A
OBO1679A
0B09494A
0B09312A
0B09240A
OBO5652A
0B01412A
OBO9280A
OBO09864A
OB09862A
OB09868A
OB09570A
OBO9866A
0B09872A
0B09189A
OB05687A
0B40054A
0B09191A
0B01400A
—
Line
Amp.
OBO6146A
OBO9677A
OBO9709A
0B09702A
0B40076A
0B01412A
—
Meter
Amp
0B10039A
0B01872A
0B12101A
OB06398A
0B06181A
0B32011A
18
—
Dolby
NR
—
Ic
Ic
TR
2SC945L
(PK)
ZD
6.2V
RD6.2EB3
100K
1/6W
J
680P
50V
J
0.012u
50V
J
5600P
50V
J
820P
50V
J
1800P
50V
J
TEA0654
TEA0652
L-C
Block
Yellow
L-C
Block
Blue
RK
CF
2.2M
1/4W
J
2.7K
3K
2.4K
3.3K
1K
68K
5.1K
2.2K
4.7K
47K
75K
330K
390K
12K
22K
1/6W
J
1/6wW
J
1/6W
J
1/6W
F
1/6W
F
1/6w
J
1/6W
F
1/6W
F
1/6W
F
1/6W
J
1/6w
J
1/6w
J
1/6w
J
1/4W
F
1/6w
J
82K
1/6W
J
100K
1/4W
J
(Noiseless)
100K
1/6W
J
100
1/4WJ
1p
50V
(LN)
0.01n
100V
G
0.0334
100V
G
4700P
50V
J
10u
16V
47P
50V
J
0.047u
50V
J
0.033u
50V
J
O.1u
50V
J
CE
0.15u
50V
(LN)
0.068u
50V
J
0.22u
50V
J
2700P
50V
J
1200P
50V
J
2200u
6.3V
4700P
100V
G
100u
16V
NJM4558DD
1K
1/6w
J
22K
1/6WJ
11K
1/6Wd
33u
16V
10pz
16V
2SC1740S
(S,E)
2SC945L
(P,Q)
65V
5C-1
1SS176
18853
Semi-fixed
VR
100K
|
R633,636
637,640
—
Logic
—
OBO6178A
0B06214A
0B11020A
OBOG6069A
0B01872A
0B12100A
0B06181A
OBO6689A
O0B32007A
OBO09749A
0B09725A
O0B09701A
OBO9617A
OBO5509A
OB09729A
OBO09217A
OB09737A
OB09711A
OBO9695A
OBO9663A
0B09672A
0B01854A
OBO09699A
OBO6706A
OBO1679A
0B01933A
O0B24007A
OBO97TO7A
OB09741A
0B06370A
OB06299A
OBO9685A
OBO9697A
0B09725A
OB05579A
OBO9677A
0B09049A
OB09327A
0B01398A
0B09291A
0B01400A
0B06013A
0B10021A
0B06372A
0B06322A
OBO6066A
0B10034A
OB06398A
Ic
Ic
TR
TR
TR
TR
TR
TR
TR
SiD
Double
SiD
MC921
siD
33K
100K
560K
150K
100K
56K
22K
10
0.154
50V
(LN)
10u
25V
(LN)
100u16V
0.022u
50V
Z
Ref-No.
tee
0B09713A
0B01889A
0B09743A
OB09729A
OB09725A
OB09719A
OBO9709A
OBO9216A
OBO9570A
OBO9148A
0B01400A
1/6w
J
1/4w
J
1/6W
J
1/6w
J
1/6W
J
1/6W
J
1/6W
J
1/4wW
J
1/6w
J
1/6wW
J
1/6w
J
1/4W
J
1/6w
J
1004
16V
uPD4011BC
uPD4071BC
TMP4315BP-
1814
2SB564
(L,M)
2SC945L
(P,Q)
28D1164
(K,L)
2SA953
(K,L)
2SC2002
(K,L)
2SD471
(L,M)
2SC1740S
(E)
2SA733
(P,Q)
1SS176
18853
L-C
Block
Semi-fixed
VR
470
RK
1M
1/6w
J
RK
100K
1/6W
J
10K
3.3
150K
5.6
330K
27K
5.6K
270
620
39K
8.2K
R
Coil
3.5
100
220
18K
470K
1/6w
J
1/6w
J
1/4w
J
1/6W
J
1/4w
J
1/6W
J
1/6w
J
1/6w
J
1/6w
J
1/6w
J
1/4w
J
1/6W
J
1/4W
J
1/4W
J
2w
J
1/6w
J
1/6w
J
Schematic
Ref.
No.
R648
,649
R652
R653
R654,655
R656
R657
R658
R659
R661
Part
No.
OBO9677A
0B01889A
0B01846A
0B09733A
0B05629A
OB09705A
OB09693A
OB09713A
0B09803A
0B09824A
0B09673A
OBO09681A
0B24023A
0B01398A
0B01405A
0B40024A
0B01802A
0B09290A
0B40178A
OBO09817A
0B02245A
0B02243A
0B81118A
10402
Q401,405
Q402,403
404
ZD401
ZD402
D401
D402
D403,404
406
R403
R404
R405
R406
R407
R408
R409
R410
R411
1K
RK
100K
1/4wJd
4.7K
1/4wJ
220K
1/6wW
J
2.7K
1/4wJ
15K
1/6WJ
4.7K
1/6WJ
33K
1/6WJI
R-Network
47Kx5
R-Network
100Kx3
RK
680
1/6W
J
RK
1.5K
1/6WJ
R
Fuse
1
220u
16V
ip
50V
0.33
50V
0.472
50V
9P-T
Post
5P-T
Post
2P-T
Post
—
DC
Supply
—
OB06380A
0B06322A
0B01872A
OBO6167A
0B06290A
OB06282A
0B12100A
OBO06398A
0B24006A
OBO01857A
OBO9671A
0B24007A
OB09725A
OBO97T07A
OBO9695A
OBO9665A
OB09693A
0B09713A
OB09719A
0B40095A
0B01392A
0B01403A
OB09292A
0B09799A
OB09798A
0B40076A
0B01405A
0B01398A
OBO8715A
0B08676B
OEOO507A
0E00612A
OEO0857A
—
Miscellaneous
—
0B60182A
0B81002A
OB81010A
OB81011A
0B81013A
0B81014A
Ic
NJM7812
TR
2SC2002
(K,L)
TR
2SC945L
(P,Q)
ZD
6.2V
RD6.2EB3
ZD
5.6V
RD5.6EB2
Diode
Bridge
DBA10
2200P
50V
J
0.01py
50V
Z
33u
10V
(KS)
Double
SiD
MC921
SiD
1SS176
560
56K
470u
16V
47g
16V
33u
16V
lu
50V
220u
16V
O.1u
50V
Z
4700u
25V
6800u
16V
Iw
J
1/4W
J
1/6W
J
1000p
25V
Thermal
Fuse
129
Heat
Sink
Nut
Hex.
M3
Main
P.C.B.
Dip
Mate
2P
Dip
Mate
3P
Dip
Mate
4P
Dip
Mate
6P
Dip
Mate
7P
M3x6
@
Pan
(2A)
ql)
BT
3x6
©
Binding
(2)
1/6w
J
'BAQ5627A-E|
Main
P.C.B.
Ass’y
BX-125E
1C305
Q112,212
VR102,202
VR103,104
203,204
R127,227
R128,228
R129,229
R130,230
R131,231
R132,135
137,232
235,237
R133,136
233,236
R198,298
R199,299
R354,355
356,363
364
C119,219
C120,220
C121,221
C122,222
C123,223
C199,299
0B11027A
0B01872A
0B32009A
0B32008A
OBO09705A
OB22327A
OBO9699A
0B01888A
OBO9707A
OBO9701A
OB05629A
OBO9709A
OB09715A
OB09725A
OBO5571A
0B05843A
OBO5659A
OB05687A
0B01913A
OB05653A
—
Rec,
Level
—
Contents
of
the
list
is
the
same
as
for
BX-125
except
the
following
section.
Ic
TR
TC9145P
2SC945L
(P,Q)
Semi-fixed
VR
22K
Semi-fixed
VR
10K
15K
1/6WJ
7.15K
1/6W
F
8.2K
1/6WJ
10K
1/4WJ
18K
1/6WJ
10K
1/6wJd
2.7K
1/4WJ
1/6W
J
1/6w
J
1/6W
J
22K
39K
100K
680P
50V
J
0.012u
50V
J
5600P
50V
J
1200P
50V
J
1800P
50V
J
1500P
50V
J
8.
SCHEMATIC
DIAGRAM
8.1.
IC
Block
Diagrams
voo
AS
B84
Y4
Y3
AZ
B3
|
Al
8!
Y1
y2
Az
82
GND
(TOP
VIEW)
Fig.
8.1.1
OR
Gate
C-MOS
IC
uPD4071BC
Voo
A4
84
Ya
Y3
AZ
B3
Ai Bt
Y1
Y2
Az
Bz
GNO
(TOP
VIEW)
Fig.
8.1.2
NAND
Gate
C-MOS
IC
uPD4011BC
i
Output
A
+V
Inverting
Input
A
Output
B
Non-Inverting
Input
A
—-Vv
Inverting
Input
B
Non-
Inverting
Input
B
(TOP
VIEW)
Fig.
8.1.3
Operational
Amp.
IC
4556D,
NJM4558DD,
NJM2043DD,
TLO92
Fig.
8.1.4
Level
Meter
Driver
TA7612AP
wo
m
r
ne
O
{Multiple
Input
Inhibition)
ae
m
o
n
Input
Circuit
Uo
Sete
Fig.
8.1.5
Analog
Switch
Selector
TC9145P
xOUT
Generctor
Instruction
Decoder
1836
Word
x@bit
le
zlote
je
Sw
[eo
jz
dele
tee
FS
(TG)
{10¢)
ROM
IN|
O-3
INO
0-3
IN2
0-3
S2
BUS
RAM
64
Word
x
4
bit
INO
O—
3:
Input
Port
INO
IN10—3:
Input
Port
IN1
|
100 0-3
IN2
0
—
3:
Input
Port
IN2
OTO
0
—
3:
Output
Port
OTO
OT10—3:
Output
Port
OT1
OT2
0
—3:
Output
Port
OT2
OT3
0
—
2:
Output
Port
OT3
100
0
—
3:
Bidirectional
Port
100
101
0
—
3:
Bidirectional
Port
101
RST
RST:
Reset
INT:
Interrupt
XIN,
XOUT:
Clock
Terminals
101 0-3
arn
Fig.
8.1.6
4-Bit
Micro-processor
TMP4315BP-1814
19
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