Nakamichi BX-2 User manual

Nakamichi
Service
Manual
Nakamichi
BX-2
2
Head
Cassette
Deck
Pn BCP sme

CONTENTS
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1, GENERAL
1.1. Voltage Selector
Voltage selector is installed on the rear panel for Other version of the Nakamichi BX-2.
This voltage selector can select either 120 V or 220-240 V at customer’s disposal.
1.2, Parts List for Carton and Packing
Part No. Description Q’ty
OF 03673C Carton 1
OFO3674A Packing 2
1.3. Serial Number
The BX-2 has two versions, Silver and Black.
In the service manual, serial numbers of these versions are identified as follows:
Silver version: A316xxxxx
Black version: A317xxxxx
However,
the
actual
serial
number
on
the
serial
number
plate
of
the
BX-2
is
indicated
as
A316.7xxxxx.
The serial number begins with A316.701001.

2.
MECHANICAL
ADJUSTMENTS
2.1.
Tape
Guide
Height
Check
for
Record/Playback
Head
and
Erase
Head
.
With
use
of
an
M-300
produced
by
Information
Terminals,
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
M-300,
Refer
to
Fig,
2.1.
(1) Record/Playback Head Tape Guide Height
(a)
Load
the
base
of
the
M-300
carefully,
then
set
the
cassette
deck
in
Play
mode.
(b)
Place
the
small
block
of
the
M-300
on
the
base.
(ce)
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.
(ad)
If
not,
loosen
the
screw
and
insert
a
shim
(either
30
um
(0C80048A),
60
um
(0C80038A),
or
100
hm
(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
M-300
carefully,
then
set
the
cassette
deck
in
Play
mode.
(b)
Place
the
small
block
of
the
M-300
on
the
base.
(ce)
Slide
the
small
block
against
the
tape
guide
of
the
Erase
Head,
and
check
whether
the
block
is
accepted
by
the
tape
guide.
2.2. Head Base Stroke Check
Refer to Fig, 2.2.
(1)
Load
the
base
of
the
M-300
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
M-300
on
the
base,
(4)
Contact
the
small
block
with
the
Record/Playback
Head
sur-
face
and
the
Erase
Head
surface,
and
check
whether
the
end
of
the
small
block
is
located
within
the
specified
tolerance
as
shown
in
the
figure.
2.3.
Record/Playback
Azimuth
Alignment
and
Height
Check
Refer to Fig. 2.1.
(1) Connect a VTVM to the Output Jacks,
(2)
Load
a
15
kHz
Azimuth
Tape
(DA09004A),
then
set
the
cassette
deck
in
Play
mode.
(3)
Turn
the
Azimuth
Alignment
Screw
until
the
outputs
of
both
channels
become
maximum.
(4)
Load
al
kHz
Track
Alignment
Tape
(DA09007A),
then
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,
2.4,
Pressure
Adjustment
of
Pressure
Roller
Refer to Fig, 2.3.
(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.
2.5. Tape Travelling Check
Load
the
Tape
Travelling
Cassette
(DA09027A),
then
set
the
cassette
deck
in
Play
mode
and
check
the
following:
(1)
After
more
than
2
seconds,
the
fluctuation
of
the
tape
trav-
elling
on
the
Record/Play
back
Head
is
small,
(2)
Tape
isin
contact
with
the
head
sufficiently.
(3)
Tape
waving
is
small
on
the
heads
and
pressure
roller.
2.6. Eject Damper Adjustment
Refer
to
Fig.
2.4.
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
movement
by
the
Adjustment
Screw.
CCW: Damper moves fast.
CW: Damper moves slowly.
Fig, 2.3
Decrease NH
Increase
Capstan Motor
Fig, 2.4

2.7, Reel Motor Speed Adjustment in Play Mode
(1) Connect a DC Voltmeter across the Reel Motor terminals.
(2) Load a C-60 cassette tape, then set the cassette deck in Play
mode,
(3) Adjust VR601 on the Main P.C.B. Ass’y to obtain approx. 3
V on the DC Voltmeter at the beginning of the tape.
(4) Load a Torque Meter TW-2111 (Made by Sony) and check
that the torque is 50 +10 g-cm.
2.8. Tape Speed Adjustment
Refer to Fig. 2.5,
(1) Connect a frequency counter to the Output Jacks,
(2)
Load
a
3
kHz
Speed
and
Wow/Flutter
Tape
(DA09006B)
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.
2.9. Lubrication
The
tape
transport
is
of
a
lubrication-free
type
mechanism.
When
the
following
parts
are
replaced,
apply
the
specified
lubricant.
(1) Molykote®) 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
(3)
Diamond
Oil
(EP56)
Reel Hub Shaft
(4) Anderol 456
Capstan Shaft
Note: We suggest that you use the above specified lubricant or
3. PARTS LOCATION FOR ELECTRICAL ADJUSTMENT
T301
@ | Bias osc.
Frequency
@ Lvei0e
Bios Cut @ fvreve
VR6OI
Reel Motor Speed (Play)
©TPior
TP201
©
MPX Filter
L205
Fig. 3
Playbock Level
Meter Level
G@ tveeo1
equivalent type.
The company dealing in the above lubricant is as follows:
(a) Molykote() 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
‘6
Increase
Domper Adjustment
Screw
Bios Trop
Peaking — (Record)
L203(@)
-200(@) ©
TP203
Rec. Cal.
VR204 VR203 VR202
‘ll VRIO5
VR207 VR206 VR205
02
N Pad
zx
SX
m ~
7)
x
VRIO4 VRIO3 VRI
sce
EX
LIO5

4.
ELECTRICAL
ADJUSTMENTS
AND
MEASUREMENTS
Note:
Electrical
adjustment
should
be
performed
after
mechanical
adjustment
is
completed.
4,1,
Adjustment
and
Measurement
Instructions
SIGNAL OUTPUT
EEN SOURCE
CONNECTION
ADJUST-
MENT
REMARKS
3 kHz Speed
and Frequency
Tape Speed | wow/Flutter | Counter to
Adjustment | Tape Output Jacks
(DA09006B)
Playback
Eq. SW— 70 us
Tape Speed
Adjustment
Volume
Adjust
the
volume
incorporated
in
the
capstan
motor
to
obtain
3
kHz
+0.5%
on
the
frequency
counter,
VTVM to
TP101, TP201
on Main P.C.B.
400 Hz to
Input Jacks
Meter Level
Calibration
Record, Pause
Main P.C.B.
VR108,VR208
1.
Feed
in
400
Hz,
then
adjust
the
Input
Level
control
to
obtain
350
mV
—0.9
dB
on
the
VTVM.
2.
Adjust
VR108
(VR208)
so
that
the
0
dB
segment
of
the
level
meter
starts
iluminat-
ing.
3.
Adjust
the
Input
Level
control
to
obtain
350
mV
on
the
VTVM,
then
decrease
the
generator
output
level
by
20
dB.
4,
Check
to
insure
that
the
segment
for
—20
dB
illuminates,
MPX Filter | 19 ¥Hz seo VTVM to
Record, Pause
MPX SW — OFF/ON
Main P.C.B.
L105,L205
1,
Adjust
the
Input
Level
control
to
obtain
0
dB
(500
mV)
on
the
VTVM.
2.
Set
the
MPX
Filter
switch
to
ON,
then
adjust
L105
(L205)
to
obtain
minimum
reading
on
the
VTVM
(minimum
reading
will be less than —30 dB).
Playback
Eq. SW — 70 us
MPX SW — OFF
Dolby NR SW — OFF
Record/Pliay back
Head Azimuth
Alignment
Screw
Adjust
the
Record/Playback
Head
Azimuth
Alignment
Screw
to
obtain
maximum
readings
of
both
channels
on
the
VT
VM.
' Hz to
Adjustment Input Jacks Output Jacks
Record/ 4
Playback 15 kHz
4 | Head Azimuth Tape | Gorout Jacks
Azimuth (DA09004A)
Alignment
Playback 400 Hz Level VTVM to
5
Level
Tape
TP101,
TP201
Calibration | (DA09005A) on Main P.C.B.
a aa
Same as above
Main P.C.B.
VR101,VR201
Adjust
VR101
(VR201)
to
obtain
350
mV
on
the
VTVM.
————_—__--}
400 Hz Level
Tape
(DAO09005A)
10 kHz PB
Frequency
Response Tape
(DA09003A)
15 kHz PB
Frequency
Response Tape
(DA09002A)
20 kHz PB
Frequency
Response Tape
(DA09001A)
Playback
Frequency
6 | Response
Adjustment
VTVM to
Output Jacks
Playback
Eq. SW — 70 ys ;
Dolby NR SW — OFF
MPX SW — OFF
1,
Load
a
400
Hz
level
tape
and
play
it
back.
2.
Load
10
kHz,
15
kHz
and
20
kHz
PB
fre-
quency
response
tapes
and
adjust
the
record/playback
head
azimuth
to
obtain
maximum
levels
on
the
VTVM
with
each
tape.
3.
Read
the
maximum
levels
with
each
tape
and
check
to
insure
that
the
levels
against
the
400
Hz
level
tape
are
within
the
follow-
ing
ranges,
10 kHz (—20 dB) —2 dB to +2 dB
15 kHz (—20 dB) —2 dB to+3 4B
20 kHz (—20 dB) —2 dB to +4 dB
Check
to
insure
that
the
difference
in
level
between
10
kHz
(20
dB)
and
20
kHz
(—20
dB)
is
less
than
2
dB.
Note:
If
the
playback
level
of
20
kHz
PB
frequency
response
tape
is
insuf-
ficient,
add
C107
(C207)
150
pF
in
parallel
with
C108
(C208)
1200
pF
in
the
playback
eq.
amp.
circuit
of
the
Main
P.C.B.
Ass’y.
4,
Conduct
step
4
“Record/Playback
Head
Azimuth Alignment’’.
Frequency
Bias
Counter
to
Oscillation
TP102
7
Frequency
on
Main
P.C.B.
and
Erase
and
Current
VTVM
across
Adjustment
the
additional
0.1 Q resistor
Record, Pause
Tape SW — ZX
Eq. SW — 70 us
Dolby NR SW — OFF
MPX SW — OFF
Main P.C.B.
T301
R318,R350
i,
Adjust
T301
to
obtain
105
kHz
on
the
fre-
quency
counter.
2.
Connect
an
additional
0.1
Q
resistor
in
series
to
the
Erase
Head,
then
connect
a
VTVM
across
it.
3. Check the erase current by the VT'VM,
Erase
current
will
be
in
a
range
of
145
mA
to
185
mA
(typically
approx.
165
mA).
If
erase
current
is
not
sufficient,
increase
it
by
shorting
R318
or
R350.
4,
After
completion
of
the
erase
curent
ad-
justment,
re-check
the
bias
oscillatiora
fre-
quency,
Remove the additional 0.1 2 resistor,
5.
|
1.
|
ceapure.
[ol
EBe
VTVM
to
re
8
;
(—20
dB)
to
TP102,
TP202
ain
P.C.B.
2s
Equalizer
Same
as
above
L102,L202
3
Short
both
Bias
Stop
test
pins
with
a
clip
to
stop
the
bias
oscillation.
Adjust
L102
(L202)
to
obtain
peak
read-
ing
at
21
kHz
on
the
VTVM.
. Remove the clip from the test pins.
Bias Trap
9
|
Adjustment
|
Remove
LE
to
(Record
input
signals
TP103,
TP203
Amp.)
Adjustment | mput Jacks al on Main P.C.B.
=
on Main P.C.B.
Same as above
Main P.C.B.
L103,L203
Adjust
L103
(L203)
to
obtain
maximum
read-
ing
on
the
VTVM.

Record
Level
Calibration
and
Recording
Bias Current
Adjustment
SIGNAL
SOURCE
OUTPUT
CONNECTION
400 Hz (0 dB),
400 Hz
(—20 GB),
10 kHz
(—20 dB) and
17 kHz
(—20 dB)
to Input Jacks
VTVM to
TP101, TP201
and
TP102, TP202
on Main P.C.B.
and
VTVM and
Distortion Meter
to Output Jacks
ADJUST-
MENT
REMARKS
Main P.C.B.
(Level)
ZX:
Record and Playback Mee 102,VR202
Tape SW — ZX/SX/EX .
Eq. SW — 70 us VE LOd RAS
(ZX/SX) -
120 us (EX) VR104,VR204
Dolby NR SW —
C-Type/B-Type/
OFF
(Bias)
ZX:
VR105,VR205
SX:
MPX SW — OFF
VR106,VR206
EX:
VR107,VR207
Adjustment should be made in the order of ZX,
SX and EX.
1
2
3.
4, Feed in 400 Hz, then adjust the Input Level
. Set the Doiby NR switch to C-Type.
. Connect a VTVM to TP101 (TP201) on the
Main P.C.B. Ass’y.
Set the BX-2 in Record/Pause mode.
control to obtain 350 mV (0 dB) on the
VTVM.
. Load a reference ZX tape (DA090374A),
reference SX tape (DA09025A) and refer-
ence EXII tape (DAO9066A).
. Adjust Record Cal. VR102 (VR202) for
ZX, VR103 (VR203) for SX and VR104
(VR204) for EXIT to center positions,
. Connect the VTVM to TP102 (TP202) on
the Main P.C.B. Ass’y. Adjust Bias VR105
(VR205) for ZX, VR106 (VR206) for SX
and VR107 (VR207) for EXII to obtain the
following bias current in Record/Pause
mode (the VTVM is connected across a 10-
ohm resistor).
ZX: approx.1mA
SX: approx. 0.5 mA
EX: approx. 0.3 mA
. Connect the VTVM to the Output Jacks,
. Feed in 400 Hz (—20 dB) and 17 kHz (—20
Saaiel then record, rewind and play them
back,
Adjust Bias VR105 (VR205) for ZX,
VR106 (VR206) for SX and VR107
(VR207) for EXII to obtain the same play-
back levels at 400 Hz (—20 dB) and 17 kHz
(—20 dB) on the VTVM.
. Feed in 400 Hz (0 dB), then record, rewind
and play it back,
Adjust Record Cal. VR102 (VR202) for
ZX, VR103 (VR203) for SX and VR104
(VR204) for EXII to obtain 0 dB on the
VTVM.
Repeat above 9 and 10 two or three times
to obtain optimum performance,
. Set the Dolby NR switch to OFF.
. Feed in 400 Hz (—20 dB), 10 kHz (—20 dB)
and 17 kHz (—20 dB), then record, rewind
and play them back.
Check to insure that the playback levels are
within —20 dB +3 dB against the levels in
Dolby NR C-Type.
Set the Dolby NR switch to B-Type,
. Feed in 10 kHz (—20 dB) and 17 kHz (—20
dB), then record, rewind and play them
back.
Check to insure that the levels are within
—20 dB +2 dB against the levels in Dolby
NR OFF.
. Check to insure whether the total harmonic
distortion is less than 1.0% for ZX and EXII
tapes and 1.2% for SX tape.
. If above is not sufficient, repeat 9 to 16 till
satisfactory results are obtained.
Overall
Frequency
Response
Adjustment
400 Hz (0 dB)
and 20 Hz to
17 kHz
(—20 dB) to
Input Jacks
1 kHz to
Input Jacks
VTVM to
Output Jacks ©
1 kHz Band Pass
Filter and VTVM
to Output Jacks
Record and Playback
Tape SW — ZX/SX/EX
Eq. SW — 70 us
(ZX/SX)
120 us (EX)
Dolby NR SW — OFF
MPX SW — OFF
Main P.C.B.
L102,L202
Record and Playback
Tape SW — ZX
Eq. SW —70us
Dolby NR SW — OFF
MPX SW — OFF
. Set the BX-2 in Record/Pause mode,
. Feed in 400 Hz, then set the Input Level
control to obtain 0 dB (500 mV) on the
VTVM.
3. Decrease the generator output control by 20
dB
. Feed in 20 Hz to 17 kHz (—20 dB) and
. If above
record, rewind and play them back, then
check to insure whether the output levels
are within —20 dB +4 dB.
is not sufficient, adjust L102
(L202) to obtain approx. —20 dB on the
VTVM, then conduct step 10 “‘Record Level
Calibration and Recording Bias Current
Adjustment”’,
. If above is not sufficient, precise re-adjust-
ment of step 6 ‘‘Playback Frequency Re-
sponse’’, replacement of Record/Playback
Head or check on item 2.6 “Tape Travelling
Check” will be required,
. Erase the tape with bulk eraser,
. Adjust the Input Level control to obtain
0 dB on the VTVM, and record the signals
on the reference ZX tape (DA09037A).
3. Turn the cassette tape the other way round
and play it back.
. Measure the difference between 2 and 3,

SIGNAL
SOURCE
OUTPUT
CONNECTION
MODE
REMARKS
Channel
Separation
Measure-
ment
1kHz to
Input Jacks
1 kHz Band Pass
Filter and VTVM
to Output Jacks
Record and Playback
Tape SW — ZX
Eq. SW — 70 us
Dolby NR SW — OFF
MPX SW — OFF
. Erase the tape with bulk eraser.
. Adjust the Input Level control to obtain
0 dB on the VTVM, and set the Balance
control to the extreme left (right).
. Record, rewind and play it back, then mea-
sure the R ch (L ch) level.
100 Hz to
Input Jacks
100 Hz Band
Pass Filter and
VTVM to
Output Jacks
Same as above
. Erase the tape with bulk eraser.
. Adjust the Input Level contro! to obtain
0 dB on the VTVM, and record the signals
on the reference ZX tape (DA09037A),
3. Rewind the tape, set the Input Level control
to minimum, and then record again.
. Rewind the tape, play it back, and then
measure the difference between 2 and 3.
Signal to
Noise Ratio
Measure-
ment
400 Hz to
Input Jacks
IHF-A Curve,
Filter, VTVM
and Distortion
Meter to
Output Jacks
Record and Playback
Tape SW — ZX
Eq. SW — 70 us
Dolby NR SW —
B-Type/C-Type
MPX SW — OFF
. Set the Dolby NR switch to B-Type/C-Type.
.
Feed
in
400
Hz,
then
record,
rewind
and
play
it
back,
.
Adjust
the
Input
Level
control
to
obtain
3%
total
harmonic
distortion
in
Playback mode.
. Set the Input Level control to minimum
then record again.
.
After
rewound,
play
back
and
check
the
2
3
4
5
L
output level difference between 3 and 4.
Note: The filter of IHF-A curve shall be used in
the measurements.
Total
Harmonic
Distortion
Measure-
ment
VTVM and
Distortion Meter
to Output Jacks
400 Hz to
Input Jacks
Record and Playback
Tape SW — ZX/SX/EX
Eq. SW — 70 us
Dolby NR SW — OFF
MPX SW — OFF
.
Adjust
the
Input
Level
contro]
to
obtain
0
dB
on
the
VTVM.
.
Record,
rewind
and
play
it
back,
.
Read
the
distortion
meter
and
check
to
insure
that
the
distortion
is
as
follows:
1.0%
or
less
1.2%
or
less
1.0%
or
less
4.2
3 kHz Speed
and Wow/
Flutter Tape
(DA09006B)
Wow/Flutter
Meter to
Output Jacks
Playback
. Dolby NR Circuit Check
Dolby
NR
circuit
incorporates
Dolby
NR
ICs
which
have
no
adjustment
point.
Perform
the
following
checks
and
make
sure
that
the
IC
operates
accurately,
ie.,
frequency
response
through
IC
is
accurate,
4.2
qd)
(a)
(b)
(c)
(2)
(a)
(b)
(ce)
(a)
.1. Dolby NR B-Type Circuit Check
Playback Dolby NR Circuit
Signal
Source:
1.4
kHz
to
negative
side
of
C134
(C234)
on
Main
P.C.B,
(Positive
side
is
connected
to
IC101-9
(IC201-9)).
VTVM
to
test
point
TP101
(TP201)
on
Main
P.C.B.
Stop
Dolby
NR
SW
—
ON
(B-Type)/OFF
Connect
a VITVM
to
TP101
(TP201)
on
the
Main
P.C.B.
Ass’y,
Set
the
Dolby
NR
switch
to
B-Type.
Feed
in
1.4
kHz
and
adjust
the
generator
output
control
to
obtain
35
mV
on
the
VTVM.
Set
the
Dolby
NR
switch
to
OFF.
Check
to
insure
that
the
reading
is
+3.2
dB
+1.5
dB
on
the
VTVM.
Output Connection:
Mode:
Record Dolby NR Circuit
Signal Source: 1,4 kHz to Input Jacks
Output
Connection:
VTVM
to
test
point
TP101
(TP201)
and
negative
side
of
C140
(C240)
on
the
Main
P.C.B.
Record/Pause
Dolby
NR
SW
—
ON
(B-Type)/OFF
Connect
a
VTVM
to
TP101
(TP201)
on
the
Main
P.C.B.
Ass’y,
Feed
in
1.4
kHz
and
adjust
the
Input
level
control
to
obtain
35
mV/11.1
mV
on
the
VTVM.
Remove
the
VITVM
from
TP101
(TP201)
and
reconnect
it
to
negative
side
of
C140
(C240).
Check
to
insure
that
the
reading
at
C140
(C240)
corresponds
to
the
following
with
Dolby
NR
switch
OFF
and
B-Type.
Mode:
Input
Level
Level
at
negative
side
of
C140
(C240)
at
TP101
(TP201)
|
Dolby
NR
OFF
Dolby
NR
B-Type
35
mV
0 dB +3.2 dB +1.5 dB
111
mV
0
dB
+8.2
dB
+1.5
dB
Eq. SW — 70 us
Play back and read the wow/flutter meter.
4.2.2, Dolby NR C-Type Circuit Check
q)
(a)
(b)
(c)
(2)
(a)
(b)
(ec)
(d)
Playback Dolby NR Circuit
Signal Source: 1.4 kHz to negative side of C134
(C234) on Main P.C.B. (Positive side
is connected to 1C101-9 (IC201-9)).
VTVM to test point TP101 (TP201)
on Main P.C.B.
Stop
Dolby NR SW — ON (C-Type)/OFT
Connect a VTVM to TP101 (TP201) on the Main P.C.B.
Ass’y.
Set the Dolby NR switch to C-Type.
Feed in 1.4 kHz and adjust the generator output control to
obtain 35 mV on the VTVM.
Set the Dolby NR switch to OFF,
Check to insure that the reading is +6.5 dB +1.5 dB on the
VTVM.
Output Connection:
Mode:
Record Dolby NR Circuit
Signal Source: 1.4 kHz to Input Jacks
Output Connection: VTVM to test point TP101 (TP2)3)
and negative side of C140 (C240)on
the Main P.C.B.
Record/Pause
Dolby NR SW — ON (C-Type)/OFF
Connect a VTVM to TP101 (TP201) on the Main P.C,B.
Ass’y.
Feed in 1.4 kHz and adjust the Input level control to obiain
35 mV/11.1 mV on the VTVM.
Remove the VTVM from TP101 (TP201) and reconnect ii to
negative side of C140 (C240).
Check to insure that the reading at C140 (C240) correspm ds
to the following with Dolby NR switch OFF and C-Type.
Mode:
Input Level Level at negative side of C140 (C240)
at TP101 (TP201) | Dolby NR OFF | Dolby NR C-Type)
35 mV 0 dB +6.5 dB +1.5 dB
11.1 mV
0 dB +11,4 dB +1.5 dB

MECHANISM ASS’Y AND PARTS LIST
5.
5.1, Synthesis
Fig. 5.1

Description ow
Synthesis (UK)
Synthesis (U.S.A. & Canada)
Synthesis (Japan)
Synthesis (Others)
Synthesis (Australia)
Synthesis (220V Class 2)
Serial No.: A31701001 - (Black)
Le eee. eee ee
Synthesis
(UK)
HA04348A
Synthesis
(U.S.A.
&
Canada)
HA04349A
Synthesis
(Japan)
HA04350A
Synthesis
(Others)
HA04351A
Synthesis
(Australia)
HA04352A
Synthesis
(220V
Class
2)
HA04353A
Serial
No.:
A31601001
-
(Silver)
Schematic
HA04342A
HA04343A
HA04344A
HA04345A
HA04346A
HA04347A
HA04362A
|
Cassette
Case
Cover
Ass’y
HA04363A
|
Cassette
Case
Cover
Ass’y
0H04133B
|}
Front
Panel
0H04134B
|
Front
Panel
0H04107A
|
Slide
Switch
Knob
0H04108A
|
Slide
Switch
Knob
0H04155B
0HO4156B
|
Top
Cover
Top Cover
Synthesis Mechanism Ass’y (UK)
Synthesis Mechanism Ass’y
(U.S.A. & Canada)
Synthesis Mechanism Ass’y
JA03963B | Synthesis Mechanism Ass’y (UK)
JA03964B | Synthesis Mechanism Ass’y
(U.S.A. & Canada)
JA03965B | Synthesis Mechanism Ass’y
JA03957B
JA03958B
JA03959B
(Japan)
(Japan)
JAO3960B
|
Synthesis
Mechanism
Ass’y
JA03966B
|
Synthesis
Mechanism
Ass’y
(Others)
(Others)
JA03961B
|
Synthesis
Mechanism
Ass’y
JA03967B
|
Synthesis
Mechanism
Ass’y
(Australia)
(Australia)
JA03968B | Synthesis Mechanism Ass’y
JA03962B
(220V Class 2)
Synthesis Mechanism Ass’y
(220V Class 2)
0J04605B
|
Bottom
Cover
0J04605B
|
Bottom
Cover
0J03564A
|
Leg
T-H
0J03564A
|
Leg
T-H
0M04377A
|
Caution
Label
0M04377A
|
Caution
Label
0M03551B
|
Pass
Label
B
0M03551B
|
Pass
Label
B
0J04630A
|
Rubber
0J04630A
|
Rubber
0J04629A
0J04628A
0E03054A
0E03032A
Top Cover Cushion B
Top Cover Cushion A
BT 3x8 ®Countersunk
BT 4x8 © Pan Washer Faced
(Black Chromate)
BT 3x6 © Binding
BT 3x10 © Binding
Voltage Label 220V
(220V Class 2)
Voltage Label 240V
(UK & Australia)
Cord Label (UK)
0J04629A
0J04628A
0E03054A
0E03033A
OEO0857A
OE00865A
OM03796A
0M03797A
Top Cover Cushion B
Top Cover Cushion A
BT 3x8 © Countersunk
BT 4x8 ® Pan Washer Faced
(Nickel)
BT 3x6 9 Binding
BT 3x10 © Binding
Voltage Label 220V
(220V Class 2)
Voltage Label 240V
(UK & Australia)
Cord Label (UK)
OEO0857A
OEOO865A
OM03796A
OM03797A
0M03844B
0M03844B
Bee ee eS HOO PRN NEPREPN RE BP BP HF Be eee bee
Bee eEeE FP HOOD BPN NE PNP HB BE Be oF BRE
0M04397A
|
Serial
Number
Plate
0M04397A
|
Serial
Number
Plate
0M04113A
|
LA
Label
(U.S.A,
&
Canada)
0M04113A
|
LA
Label
(U.S.A.
&
Canada)
0M04293A
|
Voltage
Seal
(Others)
0M04293A
|
Voltage
Seal
(Others)
0M04185A
|
FSZ
Mark
Label
(220V
Class
2)
0M04185A
|
FSZ
Mark
Label
(220V
Class
2)

5.2. Synthesis Mechanism Ass’y (A01)
U.S.A.,Canada,Japan & Others
53
55
UK, Australia & 220VClass2
JA03957B
JA03958B
Synthesis Mechanism Ass’y (UK)
Synthesis Mechanism Ass’y
(U.S.A. & Canada)
Synthesis Mechanism Ass’y
BA04804A
BA04802A
‘BA04905A
JA03959B
(Japan) BAO04800A
JA038960B | Synthesis Mechanism Ass’y
(Others) 0B06378A
JA03961B | Synthesis Mechanism Ass’y BAO4801A
(Australia) BA04803A
JA03962B | Synthesis Mechanism Ass*y
(220V Class 2)
Serial No.: A31601001 - (Silver)
0H08511A
0J04611A
CA08399A
HA04390A
0J04604B
0J04076A
BA04823A
0H04137A
0H04129A
0J04607A
0H04125A
0J04608A
0H04112A
0H04110B
0H04139B
0H04143A
0H04141B
0HO4116A
0H04118A
0H04120A
0H04123B
0H04121C
0J04610A
0J04606A
0H04105A
0H04103B
0H04113A
OHO4157A
0H04618A
BA04805A
Front Chassis
Eject Button
Eject Spring
Power Switch Button
Power Switch Spring
Meter Cover
Meter Scale
Reset Button
Control Button A
Record Mute Button
Control Button B
Control Button C
Lens
Dolby NR Switch Button
Eq. Button
Ea. Switch Spring
Button Joint
Master Volume Knob
Balance Volume Knob
Volume Plate
Volkume Cover
Volume Shield Plate
Volume P.C.B. Ass’y
BA04824A
BA04825A
0J04603D
BA04906A
BA04861A
OJ04581A
0H04102A
0J304602D
BAO04806A
0C01162B
OBO6699A
OB06698A
OBO6697B
0B06700B
0H04152B
Pa fk ek bak fe NE a Bat 19 OU Bet eek eh fake tah fe et ft ek bd
Dolby NR Switch P.C.B. Ass’y
Control Switch P.C.B. Ass’y
Counter P.C.B. Ass’y
(2nd Version)
Counter P.C.B. Ass’y
(1st Version)
Display P.C.B.
Indicator P.C.B. Ass’y
Timer Switch P.C.B. Ass’y
Headphone Jack
Headphone Plate
Mechanism Ass’y
Cover Plate Ass’y
Power Switch Joint
Power Switch Holder
Power Switch P.C.B. Ass’y
(U.S.A, & Canada)
Power Switch P.C.B. Ass’y
(UK, Australia, Others &
220V Class 2)
Power Switch P.C.B. Ass’y (Japan)
Side Chassis L
Main P.C.B. Ass’y (2nd Version)
Main P.C.B. Ass’y (1st Version)
Main P.C.B. Cushion
Function Switch Knob
Side Chassis R
Pin Jack P.C.B. Ass’y
Bolt Receptacle Plate
Power Transformer (UK,
Australia & 220V Class 2)
Power Transformer
(U.S.A. & Canada)
Power Transformer (Japan)
Power Transformer (Others)
Rear Panel
BOER eR Re Re
BER fe BNR PRN REE
|
|
4
;
8

Schematic
PELE eet
OBO8351A
0B08037U
OB08348A
0B08533A
0B08219B
0B05241A
0B08093U
0J04622B
0M04407A
0B07092U
OBO8515A
OBO8525A
OBO8854A
0M04131B
0B08347U
0B08349A
OFO1071A
0OM03954A
OEOO857A
OE00954A
O0E00509A
OE00868A
OE00824A
O£00612A
OE03028A
0E03034A
OE08583A
OE03031A
0E00233A
OE00862A
0E00714A
0E00037A
0E00172A
OB02247A
OB02248A
OB02256A
OBO2257A
0B02258A
0B02259A
0B02292A
0B05275B
0B05276B
0B05282B
0B05285B
0B05287B
0B05293B
0B05294B
0B05295B
0B05296B
0B05297B
0B05299B
OT15300A
Description
Schematic
Qrty Ref, No.
Cord Bushing 4K-4 (UK)
Cord Bushing (U.S.A., Canada,
Japan, Others, Australia &
220V Class 2)
Power Cord (UK)
Power Cord
(U.S.A., Canada & Others)
Power Cord (Japan)
Power Cord (Australia)
Power Cord (220V Class 2)
Switch Cover (UK, U.S.A.,
Canada, Japan, Australia &
220V Class 2)
Voltage Selector Lock Plate
(Others)
Voltage Selector (Others)
Insu-Lock
Fuse 2A 250V
(U.S.A., Canada & Others)
Fuse 2A 250V (Japan)
Fuse Label 1A 250V (UK,
Australia & 220V Class 2)
Fuse 1A 250V (UK, Australia &
220V Class 2)
Fuse Clip (UK, Australia &
220V Class 2)
Free-up Belt (UK, Australia &
220V Class 2)
Fuse Caution Label
(U.S.A. & Canada)
BT 3x6 © Binding
BT 2.6x8 © Binding
M3x6 ® Pan
BT 3x8 & Binding
BT 2.6x6 @Pan
M3x6 © Pan (2A)
BT 3x8 © Binding (Nickel)
M4x8 © Binding (Nickel)
Plastic Rivet
M3x8 © Binding (Nickel)
Washer 3mm Toothed Lock
BT 3x6 ®Pan
M2.6x6 © Binding
Earth Lug B-5
Washer 3mm Toothed Lock
PD Wire (Pin Jack — Volume)
PD Wire (Main — Volume)
PD Wire (Main — Headphone Jack)
PD Wire (Main — Volume)
PD Wire (Main — Volume)
PD Wire (Main — Pin Jack)
PD Wire (Pin Jack — Chassis)
4P Flat Cable FC5 (Main — Timer
Switch)
4P Flat Cable FC3 (Main —
Control Switch)
8P Flat Cable FC4 (Main —
Control Switch)
5P Flat Cable FC8 (Main —
Counter)
5P Flat Cable FC1 (Main —
Control Switch)
2P Flat Cable FC7 (Main —
Counter)
3P Flat Cable FC10 (Main —
Dolby NR Switch)
3P Flat Cable FC9 (Counter —
Dolby NR Switch)
4P Flat Cable FC2,6 (Main —
Control Switch, Counter)
5P Flat Cable FC11 (Main —
Meter IC)
12P Flat Cable FC12 (Main —
Indicator)
Wire (Main — Counter)
(2nd Version)
*; Depends on the version.
BN NOK
EF Be we wD Be Be Be ee BP BP RB BRE HERE EH N DPN NDP YNWORO HF SH Ph NW
10
JA03963B
JA03964B
JA03965B
JA03966B
JA03967B
JA03968B
0H04138A
0H04130A
0J04607A
0H04126A
0J04608A
0HO04112A
0H04110B
0H04140B
0H04144A
0H04142B
0HO4117A
0HO04119A
0HO04120A
0H04124B
0H04122C
0304610A
0JO04606A
0H04106A
0H04104B
0H04114A
0H04158A
0HO04618A
BA04805A
BA04804A
BA04802A
BA04905A
BA04800A
0B06378A
BA04801A
BA04803A
0H08511A
OJO4611A
CA08399A
HA04390A
0304604B
0J04076A
BA04823A
BA04824A
BA04825A
0304603D
BA04906A
BAO04861A
0J04581A
0H04102A
0J04602D
BA04806A
0C01162B
OBO6699A
OBO6698A
0B06697B
0B06700B
0H04152B
OBO08351A
0B08037U
OB08348A
O0B08533A
0B08219B
OBO05241A
0B08093U
0J04622B
OM03948A
0B07092U
OB08515A
Description
Synthesis Mechanism Ass’y (UK)
Synthesis Mechanism Ass’y
(U.S.A. & Canada)
Synthesis Mechanism Ass’y
(Japan)
Synthesis Mechanism Ass’y
(Others)
Synthesis Mechanism Ass’y
(Australia)
Synthesis Mechanism Ass*y
(220V Class 2)
Serial No,: A31701001 - (Black)
Front Chassis
Eject Button
Eject Spring
Power Switch Button
Power Switch Spring
Meter Cover
Meter Scale
Reset Button
Control] Button A
Record Mute Button
Control Button B
Control Button C
Lens
Dolby NR Switch Button
Eq. Button
Eq. Switch Spring
Button Joint
Master Volume Knob
Balance Volume Knob
Volume Plate
Volume Cover
Volume Shield Plate
Volume P.C.B. Ass’y
Dolby NR Switch P.C.B. Ass’y
Control Switch P.C.B. Ass’y
Counter P.C.B. Ass’y
(2nd Version)
Counter P.C.B. Ass’y
(ist Version)
Display P.C.B.
Indicator P.C.B. Ass’y
Timer Switch P.C.B. Ass’y
Headphone Jack
Headphone Plate
Mechanism Ass’y
Cover Plate Ass’y
Power Switch Joint
Power Switch Holder
Power Switch P.C.B. Ass’y
(U.S.A. & Canada)
Power Switch P.C.B. Ass’y
(UK, Australia, Others &
220V Class 2)
Power Switch P.C.B. Ass’y (Japan)
Side Chassis L
Main P.C.B. Ass’y (2nd Version)
Main P.C.B. Ass’y (ist Version)
Main P.C.B. Cushion
Function Switch Knob
Side Chassis R
Pin Jack P.C.B. Ass’y
Bolt Receptacle Plate
Power Transformer (UK,
Australia & 220V Class 2)
Power Transformer
(U.S.A, & Canada)
Power Transformer (Japan)
Power Transformer (Others)
Rear Panel
Cord Bushing 4K-4 (UK)
Cord Bushing (U.S.A., Canada,
Japan, Others, Australia &
220V Class 2)
Power Cord (UK)
Power Cord
(U.S.A., Canada & Others)
Power Cord (Japan)
Power Cord (Australia)
Power Cord (220V Class 2)
Switch Cover (UK, U.S.A.,
Canada, Japan, Australia &
220V Class 2)
Voltage Selector Lock Plate
(Others)
Voltage Selector (Others)
Insu-Lock
(to be continued)
Fe ee ee Et et ft tt et tt
BERBER BP PN PP RN EER

OB08525A | Fuse 2A 250V
(U.S.A., Canada & Others)
Fuse 2A 250V (Japan)
Fuse Label 1A 250V (UK,
Australia & 220V Class 2)
Fuse 1A 250V (UK, Australia &
220V Class 2)
Fuse Clip (UK, Australia &
220V Class 2)
Free-up Belt (UK, Australia &
220V Class 2)
Fuse Caution Label
(U.S.A. & Canada)
BT 3x6 © Binding
BT 2.6x8 ® Binding
M3x6 @ Pan
BT 3x8 & Binding
BT 2.6x6 ® Pan
M3x6 © Pan (2A)
BT 3x8 © Binding
(Black Chromate)
M4x8 @ Binding (Black Chromate)
Plastic Rivet
52 2 0B02257A | PD Wire (Main — Volume)
0B02258A
0B02259A
0BO02292A
0B05275B
PD Wire (Main — Volume)
PD Wire (Main — Pin Jack)
PD Wire (Pin Jack — Chassis)
4P Flat Cable FC5 (Main — Timer
Switch)
4P Flat Cable FC3 (Main —
Control Switch)
3P Flat Cable FC4 (Main —
Control Switch)
5P Flat Cable FC8 (Main —
Counter)
5P Flat Cable FC1 (Main —
Control Switch)
2P Flat Cable FC7 (Main —
Counter)
3P Flat Cable FC10 (Main —
Dolby NR Switch)
8P Flat Cable FC9 (Counter —
Dolby NR Switch)
4P Flat Cable FC2,6 (Main —
Control Switch, Counter)
5P Flat Cable FC11 (Main —
OB08854A
0M04131B
0B08347U
0B05276B
OB08349A
0B05282B
OFO1071A
0M03954A
0B05285B
0B05287B
OE00857A
OE00954A
OEO00509A
OEOO868A
OE00824A
OE00612A
OEO0921A
OE03058A
OE08583A
=
HERE D NVM POND PHN OWRO HF HF FB NH PL
0B05293B
0B05294B
0B05295B
0B05296B
0B05297B
0E00818A | M3x8 & Binding (Bronze) Meter IC)
OE00233A | Washer 3mm Toothed Lock 0B05299B | 12P Flat Cable FC12 (Main —
OE00862A | BT 3x6 @Pan Indicator)
oe Oe
OE00714A
OE00037A
0E00172A
OBO02247A
OB02248A
0B02256A
M2.6x6 © Binding
Earth Lug B-5
Washer 3mm Toothed Lock
PD Wire (Pin Jack — Volume)
PD Wire (Main — Volume)
PD Wire (Main — Headphone Jack)
OT15300A | Wire (Main — Counter)
(2nd Version)
*: Depends on the version.
5.3. Mechanism Ass’y (B01)
Fig. 5.3

lo eco
Mechanism Ass’y
Serial No.: A316.701001 -
CA08399A
Cassette Case Ass’y
Record/Playback Head RP-2G
Azimuth Adjust Spring
Erase Head E-2D
Erase Head Collar
Record/Playback Head Collar
Head Base Hold Plate
Steel Ball 30
Reinforce Plate
Head Base
Brake Ass’y
Take-up Reel Hub Ass’y
Supply Reel Hub Ass’y
Steel Ball 20
Pressure Roller Ass’y
Pressure Roller Spring
Cassette Case Spring
Cassette Case Holder R
Eject Sensor Holder
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
CA80001A
0G01371A
O0C80001A
0G01365A
0C80044A
0C80045A
0C80003A
0C80004A
0C80005A
O0C80006A
CA80002A
CA80003A
CA80004A
OC80007A
CA80005A
OC80008A
0C80009A
0C80010A
0C80011A
0C80012A
0C80013A
0C80014A
0C80015A
0C80016A
0C80017A
0C80018A
0C80019A
0C80020A
0C80021A
CA80006A
0C80022A | Cassette Hold Spring
0C80023A | Mechanism Chassis
0C80024A | Record Protector
0C80025A | Record Protector Holder
0C80026A
0C80027A
CA80007A
0C80028A
CA80011A
0C80029A
0C80030A
CA80008A
OC80031A
0C80033A
0C80034A
CA80009A
0C80035A
0C80036A
CA80010A
OC80037A
0C80040A
0C80041A
0C80042A
0C80043A
0C80046A
0E03038A
0E03053A
Cam
Mode Switch
Control Motor Ass’y
Control Motor Holder
Shut-off P.C.B. Ass’y
Back Tension Spring
Ree] Motor Holder
Reel Motor Ass’y
Capstan Flange
Flywheel
Capstan Belt
Flywheel Holder Ass’y
Sleeve
Floating Rubber
Capstan Motor Ass’y
Insu-Lock
2P-H Connector
4P-H Connector
9P-H Connector
5P-H Connector
Azimuth Adjust Screw
M2x12 © Binding
Wire Holder
0C80048A | Shim 0.03T
0C80038A | Shim 0,06T
0C80039A | Shim 0.1T
OE03046A | M2.6x6 © Pan (2A)
FT M2.5x5 ® Pan
Washer 1.8mm FT
Washer 3,1mm FT
E-Ring 2mm
FT M2.5x10 ® Pan
E-Ring 2.5mm
Stopper Ring 2.4mm
E-Ring 3mm
FT M2.6x6 © Pan
M2x4 @®Pan (2A)
FT M2,.5x20 ®Pan
M2x3 @® Pan
M2.6x3 © Binding
Capstan Washer
M2x5 © Pan (2A)
M2.6x9 © Pan
FT M2,5x4 ®Pan
FT M2.5x3.5 ® Pan
M2x3.2 ® Truss
0E03042A
0E£03049A
0E03050A
0E00222A
0E03043A
0E00698A
0E03052A
0E00181A
0E03048A
0E03036A
0E03044A.
0E00691A
0E03045A
OE03051A
0E03037A
0E03047A
0E03041A
0E03040A
0E03035A
- Vantaa
(HEAD C9 Bat BD ND Fat a COR 8 0 CD 02 tt tS 09 C0 Fat at at et tO te et at ed ek Pt adh Ft 09 at ek RD ee at
:
:
:
12

6. MOUNTING DIAGRAMS AND PARTS LIST
Notes: 1. Mounting diagram shows a dip side view of the printed circuit board.
2. Diode is 18853, 18953, or 181555 unless otherwise specified.
8. Abbreviation for part name:
TR — Transistor, SiD — Silicon Diode, GD — Germanium Diode, ZD — Zener Diode
RK — Carbon Resistor, RM — Metal Film Resistor, RF — Fail Safe Type Resistor, RC — Cement Resistor,
RW — Wire Wound Resistor
CE — Electrolytic Capacitor, CM — Mylar Capacitor, CC — Ceramic Capacitor, CP — PP Capacitor,
CT — Tantalum Capacitor, C — Mica Capacitor
6.1. Power Switch P.C.B. Ass’y 6.2. Pin Jack P.C.B. Ass’y
AC Input
BLK to Power
Transformer
to Power Transformer
Fig. 6.1
Schematic ; chemati
Ref. No, Description Sef No *
BA04823A | Power Switch P.C.B. BA04801A spatatos P.C.B. BA04905A | Counter P.C.B. Ass’y
Ass’y (U.S.A., (2nd Version)
Canada & Others)
BA04824A | Power Switch P.C.B. OBO2566A | Indicator P.C.B. 0B02564A | Counter P.C.B.
Ass’y (UK, Australia OBO6369A C TA7612AP OB0G6368A |IC ULM6416E-106
& 220V Class 2) OBO1909A iD 181555 OB06319A |TR 2SA608 (SP)
BA04825A | Power Switch P.C.B. 0 0B01888A 10K 1/4WJ
Ass’y (Japan) OBO1887A 5.6K 1/4WJ 0B06326A | Counter LED
OBO1857A 1K 1/4WJ : 0B06333A |LED RED TLR124A
0B02573A | Power Switch P.C.B. OB09797A 120 1/4wJ
0B07406A_ | Power Switch R305-314 | OBO5698A 15K 1/4wJ 0B09725A 100K 1/6W J
(Japan) (10) 04 OB09701A 10K 1/6wd
0B07407A | Power Switch C301 OB09281A 150P 50V K . OBO9687A 2.7K 1/6wJ
(U.S.A., Canada & OB05629A 2.7K 1/4Wd
Others) BA04803A | Timer Switch P.C.B. | 608 :
0B07408A. | Power Switch (UK, Ass’y R609-615 | OBO96G1A 220 1/6wJ
Australia & 220V (7)
Class 2) 0B02569A | Timer Switch P.C.B. | C602 OB09282A |CC 100P 50V K
0B08363A | Spark Killer (Japan) 0B07437A | Slide Switch sw601 0B07437A | Slide Switch
0B08342A | Spark Killer 0304614A | Shield Plate (1)
(U.S.A., Canada & BA04802A | Control Switch
Others) P.C.B. Ass’y BAO04800A | Counter P.C.B. Ass’y
OBO8955A | Spark Killer (UK, (1st Version)
Australia & 220V 0B02565A | Control Switch P.C.B.
Class 2) Q601 0B01872A |TR 2SC945 (L) 0B02564A | Counter P.C.B.
0E00752A | Eyelet 2x3 (3) | Q602 OB06013A |TR 2SA733 OBO06368A |IC LM6416E-106
LED601, 0B06334A | LED GRN TLG124A F 0B06319A |TR 2SA608 (SP)
BA04806A | Pin Jack P.C.B. Ass’y| 602,604 ;
LED603 0B06333A | LED RED TLR124A OB06326A | Counter LED
0B02567A | Pin Jack P.C.B. 606 , 0B06333A | LED RED TLR124A
0B02246A | 4P Pin Jack (1) | D605 0B01909A |SiD 181555
R601 OB05645A 270 1/4wJ 0B09743A 560K 1/6W J
BAO4805A | Volume P.C.B. Ass’y |R602,603 | 0B05795A 150 1/4wJ 0B09725A 100K 1/6W J
R604 OBO5691A 390 1/4wJ 0B09701A 10K 1/6WJ
OBO2568A_ | Volume P.C.B. R605 0B01680A 820 1/4WwJ 605 OBO9687A 2.7K 1/6WJI
0B07431A |VR 100K (A)x2 |R606 0B01889A 100K 1/4WJ OB05629A 2.7K 1/4wd
0B07433A | VR 100K (MN) R607 0B01846A 4.7K 1/4wJ
0B07432A | VR 10K (A)x2 c601 OB05557A 0.0154 50V J | R609-615 | OBOI6G1A 220 1/6wJ :
0J04618A | VR Shield Plate (1) | SW601-608 | 0B07438A | Switch (7)
: C601 OB05796A 0.047 50V J
BA04804A | Dolby NR Switch CA80011A | Shut-off P.C.B. Ass’y | C602 OB09282A |CC 100P 50V K
P.C.B, Ass*’y swe6oi 0B07437A | Slide Switch
0C80047A | Shut-off P.C.B. 0304614A j Shield Plate (eb)
0B02570A | Dolby NR Switch OBO6388A |TR 2SC2812
P.C.B. OBO06389A | Photo Reflector
R301,302 |0B01857A |RK 1K 1/4WJ NJL5141
R341 OB01682A |RK 6.8K 1/4WJ x 0B09840A |RK 680 Leadless
C321 0B01412A |CE 10u 16V 0B09841A |RK 18K Leadiless
$W301,302 |0B07430A {| Push Switch (1)
0J04616A | Shield Plate qt)
13

6.3. Volume P.C.B. Ass’y
Fig. 6.3
6.7. Control Switch P.C.B. Ass’y
Fig. 6.7
6.9. Counter P.C.B. Ass’y
6.4. Dolby NR Switch P.C.B. Ass’y 6.5. Indicator P.C.B. Ass’y
Fig. 6.4
6.6. Timer Switch P.C.B. Ass’y
6.8. Shut-off P.C.B. Ass’y
Fig. 6.8
teLogic Port
Fig. 6.9.1 2nd Version
Fig. 6.9.2 1st Version
14

BA04906A | Main P.C.B. Ass’y 0B01400A |CE 100u 16V C133,138 | 0B01412A | CE 10u 16V
(2nd Version) 0B02242A | 4P-T Post 140,154
233,238
— Rec. Level — — DC Supply — 240,254
C135,235 | 0B09312A 0.01u 100V G
VR102,202| 0B07418A | Semi-fixed VR 20K | 1C401 0B06380A | IC RC7812 C136,236 | 0B09240A 0.033u 100V G
0B07417A | Semi-fixed VR 10K | Q401,402 | 0B01872A | TR 2SC945 (L) C137,237 | OBO5652A 4700P 50V J
ZD401 0B06167A | ZD 6.2V RD6.2EB3 | C139,239 | OB09280A 47P 50V J
0B01683A 15K 1/4WJ | D401 0B06282A | Diode Bridge DBA10| C141,241 | OB05796A 0.0474 50V J
0B09577A |RM 7.15K 1/4WF |D402,403 | 0B01909A | SiD 1S$1555 C142,148 | 0B05583A 0.033u 50V J
0B01856A | RK 8.2K 1/4WJ | R401 OB09883A 560 1WJ 242,248
229,231 R402 0B01889A 100K 1/4wWJ |C143,146 | 0B01780A 0.1u 50V J
R130,132 | 0B01888A 10K 1/4WJ | R403 OBO5560A 18K 1/4WJ 147,243
135,137 R404 0B01887A 5.6K 1/4wWJ
230,232 R405 0B01857A 1K 1/4wJ
235,237 C401,402 | 0B09292A 0.1u 50V Z 0B09570A 0.15u 50V (LN)
R133,136 | 0B05629A 2.7K 1/4WJ | C403 0B09799A 4700u 25V
233,236 C404 0B01401A 470u 25V C145,245 | 0OB05682A 0.068 50V J
C119,121 | OBO5571A 680P 50V J C405 0B09798A 6800u 16V C149,249 | O0B05584A 0.22u 50V J
219,221 C406 0B01392A 470u 16V C150,250 | 0B09189A 2700P 50V J
C120,220 | 0B05843A | CM 0.012u50VJ | C407 0B09251A 33u 25V C151,251 | OB05687A 1200P 50V J
C122,222 | 0B05687A | CM 1200P 50V J OBO8676A | Heat Sink (1) | C152,252 | OB09257A 2200u 6.3V
C123,223 | 0B09189A | CM 2700P 50V J OEO0507A | NutHex.M3 (1) |C153,253 | 0B09191A 4700P 100V G
0E00612A | M3x6 @ Pan (2A)
1
— Rec. Eq. Amp. — — Line Amp. —
(1)
0E00857A | BT 3x6 © Binding
1C303 0B06146A |IC RC4558DD (2) 0B06124B |IC RC4558D
Q104,204 | 0B06299A | TR 2SC2878 0B01889A | RK 100K 1/4WJ
L102,202 OBOOO68A | Trap Coil 10.5mH
L103,203 | 0BO6696A | L-C Block TF10 — Bias Osc. — 0B01857A 1K 1/4WJ
VR105,107 | 0B07419A | Semi-fixed VR 50K OB05615A 22K 1/4WJ
205,207 0B06332A | TR 2SB564 (M) 0B09263A 12K_ 1/4wJ
0B07418A | Semi-fixed VR 20K OBO6688A | Bias Osc. Unit OB05621A 120K 1/4wWJ
0B05743A 27K 1/4WJ OB09263A | RK 12K 1/4WJ OB05626A 150K 1/4W J
0B01888A 10K 1/4WJ 0B09831A | RF 22 1wd 0B01405A lu 50V
0B01889A 100K 1/4w J 0B09837A | RF 10 1wJ 0B01836A 47 10V
0B05640A 180K 1/4wJ 0B01403A | CE 47 16V 0B01412A 10u 16V
119,216 OB09838A | CP 9100P 100V J OBO5885A 100p 10V
217,219 0B02233A | 2P-T Post
R118,218 | 0B01857A 1K 1/4wJ — Headphone Amp. —
R120,220 | 0BO5675A 3.9K 1/4WJ — Mute —
R121,221 | 0BO5577A 330 1/4WJI 10304 0B06370A RC4556D
R122,222 | 0B05575A 560 1/4WJ 0B06381A uPD4011BC Q108,208 | 0B06299A 2SC2878
R123,223 | 0B01854A 39K 1/4wJ 0B06332A 2SB564 (M) R165,265 | OB05622A 2.2K 1/4WJ
R125,225 | 0B01682A 6.8K 1/4wWJ 0B01872A 2S8C945 (L) R166,266 | 0B01682A 6.8K 1/4WJ
R126,226 | 0B05936A 10 1/4wd OB06155A 2SA733 (P) R167,168 | 0B01889A 100K 1/4W J
R138,238 | 0B01679A 100 1/4WJ OB01909A | SiD 181555 267,268
R139,239 | 0B01887A 5.6K .1/4W J R170,270 | OBO5579A 22 1/4w J
R140,240 | 0B05560A 18K 1/4WJ OB05509A 33K 1/4wJ |R171,271 | 0B01857A 1K 1/4WJ
R192,292 | 0B01683A 15K 1/4wJ R342 0B09049A 22 1/4w J
C110,210 | 0B01804A 3900P 50V J 0B05626A 150K 1/4WJ |C130,230 | 0B09327A 0.33u 50V (LN)
C111,211 | 0B01405A 1p 50V 322 C131,231 | 0B01398A 220u 16V
C112,212 | 0B01862A 22u 16V 0B01889A 1/4ws | C323 0B01400A 100u 16V
C113,213 | 0B01403A 47 16V
C114,214 | OBO5659A 5600P 50V J — Meter Amp. —
C115,215 | 0BO5652A 4700P 50V J 0B01888A 1/4w J
C116,216 | 0B01412A 10u 16V Q105,106 | 0B01872A 28C945 (L)
C117,217 | 0BO5682A 0.068u 50V J OBO5627A 1/4wd 107,205
C118,218 | 0B09283A 220P 50V K 0B05776A 1/4W J 206,207
C150,250 | 0B09393A 68P 50V J 0B01405A 1p 50V ZD101,201| 0B06384A | ZD 5.5V_ XZ055
C161,261 | 0B09281A 150P 50V K 0B09327A 0.33u 50V (LN) | D101,102 | 0B01909A | SiD 181555
0B07420A | Relay 12V 201,202
— PB Ea, Amp. — 305
— Dolby NR — VR108,208| 0B07425A | Semi-fixed VR 100K
Q101,102 | 0B06142A | TR 2SC2240 (BL) R141,241 | OBO5509A | RK 33K 1/4WJ
201,202 1C101, 201 | 0B06383A |IC TEA0654 R142,145 | 0B01889A | RK 100K 1/4W J
Q103,203 | 0B01872A | TR 2SC945 (L) 1C102,202 | 0B06382A |IC TEA0652 146,242
ZD301 0B06233A | ZD 10V RD10EB3 |1L104,204 | OBO6691A | L-C Block YEL 245,246
L101,201 | 0B03919B | Inductor 36mH L105,205 | OBO6690A | L-C Block BLU R143,243 | OBO5784A 560K 1/4W J
VR101,201 | 0B07418A | Semi-fixed VR 20K 3 OB05629A |RK 2.7K 1/4WJ |R144,244 | 0B05626A 150K 1/4WJ
R101,201 | 0B01684A | RK 470K 1/4WJ 0B09826A 3K 1/4WJ |R147,148 | 0B05508A 56K 1/4WJ
R102,202 | 0B09330A | RK 100K 1/4WJ 0B09588A 2.4K 1/4wJ 247,248
(Noiseless) 0B09317A 3.3K 1/4WF |R149,249 | 0B05615A 22K 1/4WJ
R103,203 | 0B01889A | RK 100K 1/4WJ 0B09491A 1K 1/4WF | R320 0B09216A 10 1/4w J
R104,204 | 0B05631A 1/4wd 0B05692A 68K 1/4WJ |C124,224 | 0B09570A 0.15u 50V (LN)
R105,205 | 0B05640A 1/4w J ; 0B09795A 5.1K 1/4WF | C125,225 | 0B09148A 10u 25V (LN)
R106,206 | 0B05622A 2 1/4w J 0B09420A 2.2K 1/4WF | C308 0B01400A 100u 16V
R107,207 | 0B05743A 1/4w J OB09356A 4.7K 1/4WF
R108,208 | 0B09830A 4.87K 1/4W F : 0B05641A 47K 1/4WJ — Logic —
R109,209 | 0B09829A 3.32K 1/4W F 0B09517A 75K 1/4wWJ
R110,210 | 0B01680A 820 1/4wWJ OB05627A 330K 1/4WJ |1C601 OB06367A TMP4315BP-
R111,211 | 0B01888A 10K 1/4wWJ . 1811
0B09263A 12K 1/4WJ OBO5676A 390K 1/4WJ | 1C602 0B06214A uPD4071C
0B01857A 1K 1/4wJ Q601,618 | OBO6066A 2S8D471 (L.M)
0B09137A 22u 25V (LN) 0B09796A 12K 1/4WF | Q602,603 | 0B06371A 2SD1286
0B09283A 220P 50V K R340 0B01889A 100K 1/4WJ | Q604,605 | 0B01872A 2SC945 (L)
0B01836A 47 10V C132,134 | 0B09223A 1yu 50V (LN) 619,623
0B01863A 3.3u 50V 232,234 624,625
0B05832A 0.0184 50V J Q606,607 | 0B06372A 2SA953
0B09281A 150P 50V K 612,613
C108,208 | 0B05687A 1200P 50V J
15

:
6.10.
Main
P.C.B.
Ass’y
Soeneee
Part
No.
Description
0B06322A |TR 2SC2002
0B06013A | TR 2SA733
0B06385A | ZD 5.6V XZ056
0B01909A |SiD 181555 (17)
OBO6689A | L-C Block BLK
0B07421A | Semi-fixed VR 300
OB09803A | R Network 47Kx5
0B09824A | R Network 100Kx3
0B01846A |RK 4.7K 1/4WJ
0B01888A 10K 1/4WJ
OB05625A 220K 1/4W J
0B05629A 2.7K 1/4WJ
OB05509A 383K 1/4WJ
0B01683A 15K 1/4WJd
OBO5577A 1/4w J
0B01857A 1/4W J
0B01684A 1/4w J
0B01933A 1/4w J
0B01679A 1/4w J
0B09304A
OBO05698A
0B09831A
OBO05560A
0B05743A
OB09882A
0B01887A
OBO05645A
0B09832A
OB05575A
0B09217A
0B01889A
OB05627A
0B05641A
OBO5508A
0B01856A
0B06706A
0B01398A
OB09817A 33u 10V (LN)
0B01405A . 1p 50V
OB09222A 0.47u 50V (LN)
0B01802A 2200P 50V J
0B02243A
0B02245A | 9P-T Post
0B02563B
0B02249A
0B02250A
0B02251A
0B02255A
0B02260A
0B02261A
0B02262A
0B02264A
0B02265A
OB02266A
0B02267A
0B02269A
0J04613A
0B07434A
0B07436A
OE00509A
Fig. 6.10.1 2nd Version
16

R103 100,
R319 1K
Fig. 6.10.2
1st Version
17
Ref, No,
Schematic
BA04861A | Main P.C.B. Ass’y
C122'222
123.223
C150,250
C161,261
Q101,102
201,202
Q103,203
ZD301
R110,210
R111,211
R112,212
R319
C102,202
C103,203
104,204
C105,205
C106,206
C107,207
108,208
VR102,202
VR103,104
203,204
OBO9577A
0B01856A
0B01888A
OB05629A
0B05571A
0B05843A
0B05687A
0B09189A
0B06146A
OB06299A
OBO00068A
OBO6696A
0B07419A
0B07418A
0B05743A
0B01888A
0B01889A
0B05640A
OB01857A
OBO05675A
OBO5577A
OB05575A
0B01854A
0B01682A
OB05936A
0B01679A
OBO1887A
OB05560A
0B01683A
0B01804A
0B01405A
0B01862A
0B01403A
OBO5659A
OB05652A
0B01412A
OB05682A
0B09283A
0B09393A
0B09281A
— PB Eq. Amp. —
0B06142A
0B01872A
0B06233A
0B03919B
OB07418A
0B01684A
0B09330A
0B01889A
0B05631A
0B05640A
0B05622A
0B05743A
0B09830A
0B09829A
0B01680A
0B01888A
0B09263A
0B01857A
0B09137A
0B09283A
0B01836A
0B01863A
0B05832A
0BO09281A
OBO5687A
— Rec. Level —
0B07418A
0B07417A
0B01683A
RM
RK
CM
CM
CM
— Rec. Eq. Amp. —
Ic
TR
(1st Version)
Semi-fixed VR 20K
Semi-fixed VR 10K
15K 1/4wWJ
7.15K 1/4W F
8.2K 1/4WJ
10K 1/4wJ
2.7K 1/4wJd
680P 50V J
0.012u 50V J
1200P 50V J
2700P 50V J
RC4558DD
2SC2878
Trap Coil 10.5mH
L-C Block TF10
TR
TR
ZD
Semi-fixed VR 50K
Semi-fixed VR 20K
27K 1/4WJI
10K 1/4WJ
100K 1/4W J
180K 1/4W J
1K 1/4W J
3.9K 1/4wJ
330 1/4WJ
560 1/4WJ
39K 1/4w J
6.8K 1/4w J
10. 1/4wJ
100 1/4wJ
5.6K 1/4W J
18K 1/4wWJ
15K 1/4WJ
3900P 50V J
1p 50V
22u 16V
47m 16V
5600P 50V J
4700P 50V J
10u 16V
0,068u 50V J
220P 50V K
68P 50V J
150P 50V K
2SC2240 (BL)
2SC945 (L)
10V RD10EB3
Inductor 36mH
Semi-fixed VR 20K
RK
RK
470K 1/4wW J
100K 1/4WJ
(Noiseless)
100K 1/4w J
82 1/4wd
180K 1/4w J
22K 1/4wJ
27K 1/4wJ
4.87K 1/4W F
3.32K 1/4W F
820 1/4wJ
10K 1/4wJ
12K 1/4WJ
1K 6«1/4wJ
22u 25V (LN)
220P 50V K
47 10V
3.3u 50V
0.018u 50V J
150P 50V K
1200P 50V J

Schematic
Ref, No,
Part No.
Description
Schematic
Part No. Description
Schematic
Ref, No.
Part No.
Description
1C101, 201
1C 102,202
L104,204
105,205
R173,273
R174,274
R175,275
R176,276
R178,278
R180,280
R181,281
R182,282
R184,284
R185,285
R186,286
232.234
0B01400A
OB02242A
CE 100u 16V
4P-T Post
— DC Supply —
OB06380A
0B01872A
OB06167A
OB06282A
OB01909A
OB05575A
OB01889A
OB05560A
OB01887A
OB01857A
OB09292A
OB09799A
OB01401A
OB09798A
0B01392A
OB09251A
OB08676A
OQE00507A
OE00612A
OE00857A
OE00037A
— Bias Osc.
OB06332A
OBOG688A
0B09263A
OB09831A
OB09837A
0B01403A
OB09591A
OB02233A
— Mute —
OB06381A
OB06332A
OB01872A
OB06155A
OB01909A
OB05509A
OB05626A
OB01889A
OBO1888A
OB05627A
OB05776A
0B01405A
OB09327A
0B07420A
IC RC7812
TR 2S8C945 (L)
ZD 6.2V RD6.2EB3
Diode Bridge DBA10
181555
560 1/4wJ
100K 1/4WJ
18K 1/4WJ
5.6K 1/4WJd
1K 1/4W J
O.1u 50V Z
4700u 25V
470u 25V
6800u 16V
470u 16V
33u 25V
Heat Sink
Nut Hex. M3 (
M3x6 © Pan (2A)
BT 3x6 @ Binding
2
(2)
Earth Lug B-5 = (2)
TR 2SB564 (M)
Bias Osc, Unit
RK 12K 1/4WJ
RF 22 iwd
RF 10 1w J
CE 47 16V
CP 0.01p 100V J
2P-T Post
LPD4011BC
2SB564 (M)
28C945 (L)
2SA733 (P)
181555
33K 1/4WJd
150K 1/4wJd
100K 1/4WJ
10K 1/4wJ
330K 1/4W J
1M 1/4wW J
lp 50V
CE 0. 133u 50V GN)
Relay 12V
— Dolby NR —
OB06383A
OB06382A
OBO6691A
OBO6690A
0B05629A
OBO9826A
OB09588A
OB09317A
OBO9491A
OB05692A
0B09795A
0B09420A
OB09356A
OB05641A
OBO9517A
OBO5627A
OBO5676A
OBO9796A
0B01889A
0B09223A
IC TEA0654
IC TEA0652
L-C Block YEL
L-C Block BLU
2.7K 1/4w J
3K o1/4w
2.4K 1/4W J
3.3K 1/4WF
1K 1/4WF
68K 1/4WwJ
5.1K 1/4WF
2.2K 1/4WF
4.7K 1/4WF
47K 1/4WJ
75K 1/4WJ
330K 1/4W J
390K 1/4W J
12K 1/4WF
100K 1/4W J
iu 50V (LN)
C142,148
242,248
C143,146
147,243
246,247
322
C144,244
153,253
C131,231
C323
Q105,106
107,205
206,207
ZD101,201
VR108,208
R141,241
R142,145
146,242
245,246
R143,243
R144,244
R147,148
247,248
R149,249
R320
C124,224
C125,225
C308
IC601
1C602
Q601,618
Q602,603
Q604,605
619,623
624,625
Q606,607
612,613
0B01412A 10u 16V
0B09312A
0B09240A
0B05652A
0B09280A
OBO5796A
0B05583A
0.01p 100V G
0.033u 100V G
4700P 50V J
47P 50V J
0.047u 50V J
0.033u 50V J
0B01780A O.1u 50V J
OB09570A 0.15 50V (LN)
0.068 50V J
0.22u 50V J
2700P 50V J
1200P 50V J
2200u 6.3V
4700P 100V G
OB05682A
0B05584A
0B09189A
OBO5687A
OB09257A
0B09191A
0B06124B
0B01889A
RC4558D
100K 1/4WJ
OB01857A 1K
0B05615A 22K
0B09263A 12K
0B05621A 120K 1/4W J
OB05626A 150K 1/4WJ
0B01405A 1p 50V
0B01836A 47 10V
0B01412A 10u 16V
OBO5885A 1004 10V
1/4w J
1/4w J
1/4w 3
— Headphone Amp. —
0B06370A
OB06299A
0B05622A
0B01682A
0B01889A
RC4556D
2SC2878
2.2K 1/4WJ
6.8K 1/4WJ
100K 1/4wW J
OB05579A 22
OB01857A 1K
0B09049A
OB09327A
0B01398A
0B01400A
1/4w J
1/4w J
22 1/4w J
0.334 50V (LN)
220u 16V
100u 16V
— Meter Amp. —
O0B01872A 2SC945 (L)
0B06384A
0B01909A
ZD
siD
5.5V XZ055
181555
Semi-fixed VR 100K
33K 1/4WJd
100K 1/4W J
0B07425A
OBO5509A
O0B01889A
0B05784A
OBO05626A
0B05508A
560K
150K
56K
1/4W J
1/4W Jo
1/4w J
OBO05615A
0B09216A
OB09570A
OB09148A
0B01400A
22k 1/4wJ
10 «1/4ws
0.15u 50V (LN)
10u 25V (LN)
100 16V
—_ Logic ~—e
0B06367A TMP4315BP-
1811
uPD4071C
2SD471 (L.M)
28D1286
28C945 (L)
OB06214A
OBO6066A
OB06371A
0B01872A
0B06372A 2SA953
18
Q608,609
614,615
620,621
Q610,611
616,617
622
ZD601
D601-617
L601
VR601
R601
R602
R603,612
614,649
R604,605
606,629
R607,608
R609,643
R610,611
648
R613
R615
R616,617
R626,627
R628
R630
R632
R633
R635
R636
R637
0B06322A
0B06013A
OB06385A
0B01909A
OBO6689A
0B07421A
OB09803A
OB09824A
0B01846A
0B01888A
0B05625A
OB05629A
OB05509A
0B01683A
OBO05577A
OBO1857A
0B01684A
0B01933A
OB01679A
0B09304A
OB05698A
0B09831A
OB05560A
0B05743A
0B05794A
OB01887A
0B05645A
0B09832A
OBO55754
0B09217A
0B01889A
OB05627A
OB05641A
OB05508A
OB01856A
OB06706A
0B01398A
OB09817A
OB01405A
OB09222A
0B01802A
0B02243A
OB02245A
— Miscellane
OB02563A
0B02249A
0B02250A
0B02251A
0B02255A
OB02260A
OBO02261A
OB02262A
0B02264A
OB02265A
0B02266A
OB02267A
0B02269A
0J04613A
0B07434A
0B07436A
OE00509A
TR 2S8C2002
TR 2SA733
5.6V XZ056
SiD 181555 (17)
L-C Block BLK
Semi-fixed VR 300
R Network 47Kx5
R Network 100Kx3
RK 4.7K 1/4WJd
ZD
RK 10K 1/4WJ
RK
RK
RK
220K 1/4W J
: 1/4w J
33K 1/4WJ
1/4w J
1/4W J
1/4w J
RK
RK
RK
1/4W J
1/4Ww J
1/4w J
1/4w J
1/4W J
1wJ
1/4W J
1/4wW J
1/4W J
1/4W J
1/4w J
1w J
1/4wW J
1/4w J
1/4w J
1/4W J
1/4wW J
1/4W J
1/4W J
33u 10V (LN)
ly 50V
0. wi 50V (LN)
2200P 50V J
5P-T Post
9P-T Post
ous —
Main P.C.B.
PD Wire
PD Wire
PD Wire
PD Wire
PD Wire
PD Wire
PD Wire
PD Wire
PD Wire
PD Wire
PD Wire
PD Wire
Shield Plate M
Push Switch
Push Switch
M3x6 ® Pan
{

7.
SCHEMATIC DIAGRAMS
7.1. Attention to Servicemen
(1) Parts Replacement
Following parts shall be replaced with the specified ones,
Refer t
© the parts list.
(a) Power Supply Circuit
Power Cord
Power Transformer: Tl
Fuses: F401, 402
(b) Power Switch P.C.B. Ass’y
Power Switch: SW1
Spark Killer: M2
7.2. IC Block Diagrams
Output A +V
inverting Input A Output B
Non-tnverting Inverting
Input A Input B
~v+4 Non- Inverting
Instruct
Decoder
(10
Timing
Generator
(T6)
input 8
(TOP VIEW)
Fig. 7.2.1 Operational Amp, IC 4558, 4556
Voo A4 Ba Ya Ys As B3
Ay B81 Ya Ye Az Bz GND
(TOP VIEW)
Fig. 7.2.2 NAND Gate C-MOS IC uPD4011BC
an
>zlo[eir
O A fu lo iz
me IE Jee In
veo Ae Bs Ys Ys Az B83
Ar Bi Yr ye Ar B82 GND
(TOP View!
Fig. 7.2.3 OR Gate C-MOS IC uPD4071BC
INO 0-3 IN¢ 0-3
ion
ic)
E
ee =
1536 Word
x Bbil bs ome P
ear =
Ay,
Le
—|
SR BUS:
a i sale te
A A
ee ee ee al
ca
an
T
|
|
Dd BUS
(ce) Main P.C.B. Ass’y
Power Transistors: Q301, 304, 601, 602, 603, 606, 607,
608, 609, 612, 613, 614, 615, 618, 620, 621
Diode Bridge: D401
Relay: RL301
Fail Safe Type Resistors: R318, 320, 342, 350, 401, 632,
639, 641
Wire Wound Resistor: R651
(2) Insulation Check
Before returning the repaired BX-2 to a customer, check to insure
that the exposed part is accurately insulated from the AC line by
measuring the leakage current or the insulation resistance between
them,
. max
IN2 0-3
Fig. 7.2.4 Level Meter Driver TA7612AP
INO 0— 3: InputPort INO
IN1 0— 3: Input Port IN1
IN20—3: Input Port IN2
OTO0O0— 3: Output Port OTO
S18US
a2 9
Zz 6
o >
OTO 0-3
OT! 0-3
ae
108 0-3
OT10— 83: Output Port OT1
OT20—3: Output Port OT2
OT30—2: Output Port OT3
100 0— 3: Bidirectional PortIO0
I01 0— 3: Bidirectional Port iOl
RST: Reset
INT: Interrupt
XIN, XOUT: Clock Terminals
4-Bit Micro-processor TMP4315BP-1811
19