Matsushita Electric NATIONAL RQ-158S User manual

NATIONAL
TAPE
RECORDER
SERVICE
MANUAL
MODEL
RQ-1585S
AUTOMATIC REVERSE
AND
VOICE
OPERATION
TAPE
RECORDER
CONTENTS
SPECIFICATIONS
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MECHANICAL
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JAPAN

SPECIFICATIONS
Power
Source:
Battery:
9V
(6
“D”
size
Batteries)
Audio
Output:
1.2W
(1.5
W
maximum)
Transistors:
2SB
173(1)
2SB
175(4)
2SB
176(1)
2SB
324(2)
2SB
172(1)
Recording System: AC. Bias 35K Cycles
Erasure System: DC. Erase
Track
System:
Automatic
Reverse
2
Track
System
Monitor System: Sound Monitor
Tape
Speeds:
3-3/4
ips.
and
1-7/8
ips.
Frequency
Response:
120~8,000
c/s
at
3-3/4
ips.
120~5,000
c/s
at
1-7/8
ips.
Input Impedance: Microphone 8 KQ
Auxiliary 80 KO,
AC. Adaptor 9V
Output
Impedance:
Extension
Speaker
Jack
“EXT.SP”
8
Q
Playing
Time:
1
hour
at
3-3/4
ips.
with
5”
Tape
(600
ft)
2
hours
at
1-7/8
ips.
with
5”
Tape
(600
ft)
Battery
Life:
More
than
15
hours
(using
NATIONAL
“Hi-Top”
Batteries)
Recording
Level
Indicator:
VU.
Meter
Built-in
Speaker:
6”
x
3-1/4”
Dynamic
Speaker
Dimensions:
11-3/4”
(W)
x
13”
(D)
x
3-3/8”
(H)
Weight:
About
10
Ibs.
without
Batteries
PARTS LOCATION
Case Lid
Left Reel Table
Head Cover
Volume Control Knob
Tone Control Knob
Voice Operation Switch
Level Indicator
“CUE” (Instant Stop) Button
Rewind Push Button
Stop Push Button
Fast Forward Push Button
Play Push Button
Record Push Button
Right Reel Table
Capstan Sleeve Rest
Tape Countor
Reverse Push Button
e © © © © &® °@&
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Auxiliary Input Jack
Microphone and Remote Control Jack
AC. Adaptor Jack
Sound Monitor Switch
Earphone and EXT. SP. Jack
®B®OSo®
® © @O®@

BLOCK
DIAGRAM
OF
ELECTRICAL
CIRCUITS
RECORDING CIRCUIT
Negative Feedback
Negative Tr4
Feed
back
Level
2SB324
Control
@
MONITOR
(7
2
Lf,
>
O
Monitor
Mic.
©-9--{kK))
ky
KY)
Switch
© O
Trl
Tr2
Tr3
o
3
[[[sreaxer
2SB173
2SB175 2SB175
°
AUX.©
O Q
J
pee
Out
put
2 Transformer [5
2S$B324 Transformer
NYQOO
oO oO
QOQOQOQO) O00
a a a ee ee oe ae a SRS a
FORWARD #f \.Motor Reverse
Sacre
/
Equal
Ss
;
Record/ | 5 4 f quatization “BT ransistor .. Switch
Playback
|,
$b
|
c
Relay
Head
|
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2
|
~
-
ron}
MOTOR
ae
a5
:
K)
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a)
I's
©
1S
us
Nass
>
Head
!
B
S
S
CL)
(a
ae
ane
| Zo | -Tr6 Tr7 Tr8 Tro kG
Senin eee | 2SB172 2SB175 2SB175 2SB176
ecor / ' <0 !
Playback
B
F
Pole
Head =O Oo. !
H
|
O
lift
Erase 1 \§° > Head Connection
Head Bi R Switch Battery 9V
-=-—-K.. 1
REVERSE
Za
PLAYBACK CIRCUIT
Negative Feedback '
@ MONITOR
[semen
Volume
i Control
Record /
Playback
Head
Tr2 Tr3
2SB175 2SB175
Erase
Head H
Input Tr5 Output
Record
/
:
‘
Transformer
253324
Transformer
Playback
Head
Motor
! Reverse
~ Switch
Erase
Head
“B” Transistor
=
REVERSE
Power Sorce
[|e]
Battery 9V A

DISASSEMBLY INSTRUCTIONS
BOTTOM COVER FLYWHEEL
(A)
(A)
1. Turn over the Main Cabinet Body.
2. Remove 5 screws (A) holding Bottom Cover.
3. Pull out Speaker lead wires.
1. Remove Capstan Sleeve (E) from Capstan.
2. Unscrew and remove screws (F) from the Upper
MAIN CABINET BODY CASE Baseplate, and remove Baseplate.
3. Unscrew and remove screw (G) from the Slide
‘B) Switch Rod and move the Rod toward the Reel Table.
4. Carefully remove the Flywheel. In this instance, care
must be taken not lose the Thrust Steel Ball put in
the Flywheel Shaft Bearing.
= ths 9 ZAK aE
nar oO NATL Automatic Reverse
MOTOR
. Remove Head Cover.
. Remove screw (B) under the Head Cover.
3. Remove Bottom Cover.
(Refer to Bottom Cover)
DF
(D) (C) (D)
g
Z
HN een =:
(D) (D) 1. Loosen screw (H) and remove Motor Pulley.
2. Unscrew and remove screws (1) and remove Motor.
ZN
4. Remove 5 Chassis Mounting Screws (C) and (D).

MECHANICAL
OPERATING
CONTROLS
OPERATION
Set
to
required
speed
by
inserting
Capstan
Sleeve
or
removing
it
from
Capstan.
When
“PLAY”
Push
Button
is
pressed,
the
unit
is
set
at
“PLAY’’
mode.
When “PLAY” and “RECORD” Push Buttons are pressed simultaneously, the unit is set at “RECORD” mode.
When
“REWIND”
Push
Button
is
pressed,
the
tape
just
recorded
or
played
back
is
rewound
rapidly.
When
“FAST
FORWARD”
Push
Button
is
pressed,
the
tape
is
advanced
rapidly.
When
“CUE”
Push
Button
is
pressed,
the
tape
motion
stops
instatly
for
cueing
and
editing
purposes.
When “REVERSE” Push Button is pressed together with the “PLAY” Push Button, or while the tape is moving in
normal
forward
direction,
the
tape
moves
in
reverse
direction,
or
the
tape
direction
reverses
instantly.
NOOR WNE
TAPE TRANSPORT CONTROL FUNCTIONS
1.
The
Buttons
are
released
automatically,
when
the
other
Buttons
are
pressed,
except
“CUE”
Push
Button.
2.
The
“CUE”
Push
Button
is
inoperative
when
unit
is
set
at
“FAST
FORWARD”
or
“REWIND”
mode.
TAPE
TRANSPORT
OPERATION
PLAYBACK AND RECORD
Left Reel Table z
Idler Wheel-A ). Right Reel: Table
and Pulley Idler and Pulley
: a Whee !-B
Z
Motor \_-—"
Pulley,
Normal
Operation H
Pressure
PLAY
Push Button
When
“PLAY”
Push
Button
is
depressed,
Pressure
Roller
is
pressed
against
Capstan
and
the
left
side
Pressure
Pad
assembly
is
pressed
against
Haed.
At
the
same
time,
Idler
Wheel-B
contacts
Idler
Wheel-A,
Right
Reel
Table
and
Pulley
simultaneously causing Right Reel Table to rotate.
When
“PLAY”
and
“RECORD”
Push
Buttons
are
depressed
simultaneously,
the
unit
is
in
the
“RECORD”
mode,
with
the
mechanism set in the same manner as in the “PLAY” mode.

FAST FORWARD
Left Reel Table
and
Pulley
Fast
Forward
: Roller
Fast Forward Lever
Right Reel Table
and Pulley
1°)
Playback
Lever
FAST FORWARD
Push Button
When “Fast Forward” Push Button is depressed, Fast Forward Roller contacts against Idler Wheel-A.
At the same time, Idler Wheel-B contacts against Right Reel Table, Idler Wheel-A and Right Reel Pulley simultaneously
causing Right Reel Table to rotate rapidly.
Motor
Pulle
REWIND
2
Left Reel Table Idler \.(Fast Forward\ (Fast Forward
and Pulley Wheel-A/ \Roller Lever
Y
; Idler
Minter Whee] -B
Pulley,
(REWIND
‘\Push Button
When “REWIND” Push Button is depressed, Fast Forward Roller contacts against Idler Wheel-A and Idler Wheel-B
contacts against Left Reel Table causing Left Reel Table to rotate rapidly. :

STOP
Left
Reel
Table\
/Left
eg
cs
e
eel
Table
e
Wheel-A
i
and
rulley
:
and Pulley = Wheel-B sop
rake
Normal Reverse
Operation Head Operation Head
. is - >
Left
Pressure -Pad
Right
Roller \Pressure Pad
When
“STOP”
Push
Button
is
depressed,
previously
engaged
Push
Button
is
instantly
released.
Brakes
will
stop
both
Reel
Tables
and
power
supply
to
the
unit
is
cut-off.
REVERSE
=
Reverse
Operation Head
REVERSE
Push Button
When “REVERSE” Push Button is pressed or the Auto-Reverse Mechanism is activated by means of contact of the
metal sensing foil attached to the tape against tape guide post while unit is in “RECORD” or “PLAY” mode of normal
forward direction, Idler Wheel-B contacts against Left Reel Table and Idler Wheel-A.
Simultaneously, right side pressure Pad assembly Presses against Head.
Pressure) (Right
Pressure Pad

MECHANICAL ADJUSTMENTS
PRESSURE ROLLER TENSION
' “a Capstan
Pressure Roller Spring
Pressure Roller
Bressaiia Roller Lever
Spring Scale
1. Shaft of Pressure Roller must be parallel to shaft of
Capstan.
2. Pressure between Capstan and Pressure Roller can
be checked as follows:
a. Set the recorder in PLAY mode with speed set
at 1-7/8 ips.
b. Hook a loop of thread at Pressure Roller Shaft
and Spring Scale and pull until Pressure Roller
is disengaged from Capstan.
c. The acre pressure is between 7~12.4 ozs.
(200~350 g).
d. If pressure is not within the above range, adjust
Pressure Roller Spring.
IDLER TENSION
Left Reel Table and
Idler Wheel-A_
Reel Table Pulley
Idler Wheel-B bas alee
Tension Gauge
1. Shaft of Idler Wheel-B must be parallel to shafts of
Idler Wheel-A and Reel Table Pulley.
2. Pressure between Idler Wheel-B and Idler Wheel-A
and Reel Table Pulley can be checked as follows:
a. Set the recorder in PLAY mode.
b. Hook a loop of thread as follows and pull until
Idler is disengaged from the Idler Wheel-A (con-
duct for both Idler Wheels).
c. The proper pressure is between 1.4~2.5 ozs.
(40~70 8).
Right Reel Table and
Reel Table Pulley
WINDING TORQUE
F.F. Roller
Idler Wheel-A Spring
1. Place a 5 inch tape reel on either the right or left
reel table and hang the end of the tape on a
Tension Gauge.
2. Proper tensions are as follows:
a PLAY MOdeicisscdsszens. more than 0.176 ozs. (5g)
b. REWIND mode ......... more than 0.53 ozs. (15g)
CG. -FF. MOE! secccdevsiveess more than 0.53 ozs. (15 g)
3. If tension is less than the above figures, adjust
Idler Wheel-A spring for PLAY tension and F.F. spring
for F.F. and REWIND tensions.
PRESSURE PAD PRESSURE
Tansion Gauge
. Set the unit in PLAY mode.
. Place a tention gauge at the center of tape pad.
. Gradually draw the pad from the head until pad is
disengaged from head and read the scale.
4. Proper pressure should be 1.05~1.60 ozs. (30~
45g).
5. If tension is not within the above range, adjust pad
spring.
WHE

AMPLIFIER ADJUSTMENTS in comparison to the head assembly for
“regular”. direction Operation.
C. Care must also be taken in checking the
RECORD/PLAYBACK HEAD AZIMUTH pressure pad contact to the head. The pad
ADJUSTMENT must be pressed against head correctly
(vertically to the head and in parallel to
Instruments Required: V.T.V.M. Standard Alignment the tape) and also there should not be any
Tape, 8 Q Resistor. difference in tape motion whether the pad
Measuring Circuit: Refer to Fig. 1. is in contact or not, both for normal and
reverse operations.
EXT. SP. JACK RECORD BIAS FREQUENCY ADJUSTMENT
Instruments Required: Oscilloscope, AF Oscillator, 100 Q
Resistor.
RQ-158S Measuring Circuit: Refer to Fig. 3.
PLAY MODE VTVM ie
Lissajous’
Fig. 1 aoe
g i Sk RB _] figure
Measuring Method:
1. As shown in Fig. 1, connect V.T.V.M. to Extension
Speaker Jack of model RQ-158S and terminate with
8 © resistor. , Oscilloscope aR tied:
2. Thread Standard Alignment Tape (azimuth ad-
justment part) and set recorder to PLAYBACK mode. Fig. 3
3. Turn head adjustment screw for maximum reading
at V.T.V.M. Measuring Method:
4. After completion of above adjustment, lock screw 1. As shown in Fig. 3, insert a 100 resistor to ground
with paint. lead wire of Record Head and connect vertical axis
5.
Adjust
levels
of
heads
(in
relation
to
Erase
Head)
of
Oscilloscope
across
resistor;
connect
horizontal
axis
as in Fig. 2. For quick check, lift pressure pad of Oscilloscope to output termin! of AF Oscillator.
assemblies with fingers and note position of tape 2. When model RQ-158S is set to RECORD mode,
in relation to heads. connected as above and volume control (VR-2) set
at minimum and VR-4 (semi-fixed variable resistor
0.0078 ~0.035 0.1181 +0.0039 for bias current adjustment) set at center pesitions,
0.0256 0. 1181 +0.0039 Lissajous’ figure will appear on the Oscilloscope; refer
f 0.0078~0.035 to this figure to check frequency of bias oscillator.
Standard frequency is 30~40 KC.
3. If frequency is not within above range, adjust core
Las hel
CENTER( | of T4 (Bias Oscillator Coil) until above frequency
is obtained.
0.6181 ; NOTE: The above adjustment must be made for both
I “normal” and “reverse” operation heads. Also,
lock cores with paint after adjustments.
NORMAL HEAD P*°*"F eevee Se HEAD
Fig. 2 Unie Ineh RECORD BIAS CURRENT ADJUSTMENT
Instruments Required: V.T.V.M. 100 © Resistor.
NOTE: A. The levels of heads are to be adjusted by Measuring Circuit: Refer to Fig. 4
spacer-B, so place the proper number of
spacers according to the color code indicated
on the head. | al
Color code on the head No. of spacers required RQ-158S
“Red |
None 1 pS. RECORD MODE
Black Nil
B. Care must be taken in mounting the head
assembly for the reverse operation. The erase
record and playback slits on the “reverse 7,
head assembly are located in reverse positions Fig. 4

Measuring Method:
1. As shown in Fig. 4, insert 100 © resistor to ground
lead wire of Record Head and connect VTVM across
resistor.
2. When recorder is set to RECORD mode with volume —
control set at minimum, BIAS (to be fed to Record
Head) will be indicated at V.T.V.M.
3. As standard bias current for model RQ-158S is set
between 0.6 and 0.8mA, VTVM reading should be
between 60 and 80 mV (0.6~0.8 mAx 10? x 1000
=60~80 mV). If out of range, adjust VR-4.
NOTE: The above adjustment must be made for both
“normal” and “reverse” operation heads. Record/
Playback and Erase heads are connected to
assure correct phase. relationships, so do not
reverse connections to any of the heads, .as
this will result in an increase in noise and
distortion.
ERASE CURRENT ADJUSTMENT
Instruments Required: DC Milliammeter (having range
of O~20 mA or 50 mA).
Measuring Circuit: Refer to Fig. 5
RQ-158S
RECORD MODE
Erase Head
D.C Milliammeter
Fig. 5
Measuring Method:
1. Disconnect wiring from ground side of erase head
and insert DC Milliammeter between wire and
terminal as shown in Fig. 5.
2. When recorder is set to RECROD mode, with volume
control (VR-2) set at minimum -position, DC Milliam-
meter will indicate erase current.
3. Standard erase current is between 7~11 mA. If
current measured is not within above range replace
R-31 resistor (Lower resistance value if current is
low and vice versa).
NOTE: DC Milliammeter must be accurate. If “DC
Current Range” of regular “VOM” is used,
it should be calibrated for accurate reading.
RECORD LEVEL ADJUSTMENT
Instrument Required: AF Oscillator, Attenuator, VTVM,
600 Q and 100 Q Resistors.
Refer to Fig. 6.
=
RECORDING
AMPLIFIER
Measuring Circuit:
Record/Play
[LO OS | fo000]
Fig. 6
Measuring Method:
1. Set Monitor Switch (S3) at “OFF”. In order to cut-
off bias current from oscillator circuit, insert a paper
between the contacts of Bias Cut-off Switch (S10).
2. As shown in Fig. 6, connect output of AF Oscillator
to Microphone Input Jack of model RQ-158S through
Attenuator (terminate with 600 Q if impedance of
attenuator is 600 Q). Disconnect wiring from ground
side of Record Head; insert 100 resistor between
lead wire and terminal; connect V.T.V.M. across resistor.
3. Set recorder to RECORD mode, with volume control
set at maximum and VR-3 (semi-fixed variable
resistor for level adjustment) at center positions.
4. Set AF Oscillator output for 1 Kc, adjust attenuator
to obtain 50mV reading at V.T.V.M. Attenuation
level at this setting should be —69~ —75 db.
5. If attenuation level is not within above range, replace
R-10 (Lower resistance value if current is low and
vice versa).
6. Also confirm that the Level Meter setting at this
moment is —3~3 db.
7. If setting is not within above range, replace R-37
(Lower resistance value if setting is low and vice
versa).
NOTE: The above adjustment must be made for both
“normal” and “reverse” operation heads.
OVERALL LEVEL BALANCE (between normal .
and reverse operations) ADJUSTMENT
Instruments Required: AF Oscillator, Attenuator, V.T.T.M.
600 Q and 8 Q Resistors.
Measuring Circuit: Refer to Fig. 7
MIC JACK
EXT.SP.JACK
a
RECORD & VTVM
PLAYBACK
MODES
Fig. 7
Measuring Method:
1. As shown in Fig. 7, connect output of AF Oscillator
to Microphone Input Jack of model RQ-158S through

Attenuator (terminate with 600 Q if impedance of
attenuator is 600 Q).
. Connect V.T.V.M. to Extenion Speaker Jack of model
RQ-158S and terminate with 8 Q resistor.
. Set the recorder to RECORD mode with tone and
volume controls set at maximum positions.
. Set AF Oscillator output for 1 Kc, adjust attenuator
to obtain O-VU reading at Level Meter and continue
attenuation to further attenuate 15 db. Record signals
in normal and reverse motions.
. Playback tape. If the difference of VU meter readings
between “normal” and “reverse” forward recording
is more than 6 db, adjust VR-3 (semi-fixed variable
resistor for level adjustment).
NOTE:
so adjust levels in relation to the others.
The VR-3 is also related to the RECORD LEVEL,
VOICE OPERATION SENSITIVITY ADJUSTMENT
Instruments Required: AF Oscillator Attenuator, V.T.V.M.
600 Q and 8 Q Resistors.
Measuring Circuit: Refer to Fig. 7
REPLACEMENT PARTS LIST
Measuring Method:
1,
As shown in Fig. 7, connect output of AF Oscillator
to Microphone Input Jack of model RQ-158S through
Attenuator (terminate with 600 Q if impedance of
attenuator is 600 Q).
. Connect VTVM to Extension Speaker Jack of model
RQ-158S and terminate with 8Q resistor.
Set the recorder to RECORD mode with tone and
volume controls set at maximum positions, monitor
switch to “on”, and voice control switch to “AUTO”.
Set AF Oscillator output for 1 Kc, adjust attenuator
to obtain 0.3 V reading at V.T.V.M.
First, turn VR-6 (semi-fixed variable resistor for voice
control sensitivity adjustment) to maximum (extreme
clockwise position) and gradually rotate it to counter-
clockwise direction and stop rotation as soon as the
motor JUST starts rotation.
If the motor does not start rotation with 0.3 V
output, confirm whether the motor starts rotation
with the signal 7 db below O-VU on the Level Meter
with VR-6 set at minimum (extreme counter-clockwise
position).
If the motor still does not start rotation with the
above setting, check voice operation control circuit
referring the Trouble Shooting Guide.
ATTENTION:
are not listed up here will not be supplied.
So a Part in an assembly has to be ordered as a whole assembly.
Please
order
Replacement
Parts
according
to
this
Replacement
Parts
List.
The
Parts
which
RESIST ORS
Ref. No. Description
R 1 Carbon Resistor 8.2KQ,
R 2 Carbon Resistor 270 Q
R 3 Carbon Resistor 82 KQ
R 4 Carbon Resistor 18 KQ
R 5 Carbon Resistor 2.2KQ
R 6 Carbon Resistor 47 Q,
R 7 Carbon Resistor 33 KQ,
R 8 Carbon Resistor 3.3 KO,
R 9 Carbon Resistor 10KQ,
R 10 Carbon Resistor 180 KQ
R11 Carbon Resistor 2.7 KQ,
R 12 Carbon Resistor 47 KQ,
R 13 Carbon Resistor 10KQ
R 14 Carbon Resistor 2.2 KQ,
R 15 Carbon Resistor TKO
R 16 Carbon Resistor 15 KQ,
R 17 Carbon Resistor 1.8KQ
R 18 Carbon Resistor 180 Q
R19 Carbon Resistor 18Q
R 20 Carbon Resistor 1.2KQ,
R 21 Solid Resistor 47 Q
R 22 Carbon Resistor 820 OQ
R 23 Carbon Resistor 2.7 KQ
Carbon Resistor 2.2KQ,
(appropriable)
1/4 Watt
1/4 Watt
1/4 Watt
1/4 Waitt
1/4 Watt
1/4 Watt
1/4 Watt
1/4 Watt
1/4 Watt
1/4 Watt
1/4 Watt
1/4 Watt
1/4 Watt
1/4 Watt
1/4 Watt
1/3 Watt
1/4 Watt
1/4 Watt
1/4 Watt
1/4 Waitt
1/2 Watt
1/4 Wait
1/4 Watt
1/4 Watt
Part No.
10% ERD-14VK822
10% ERD-14VK271
10% - ERD-14VK823
10% ERD-14VK183
10% ERD-14VK222
10% ERD-14VK470
10% ERD-14VK333
10% ERD-14VK332
1q% ERD-14VK103
10% ERD-14VK184
10% ERD-14VK272
10% ERD-14VK473
10% ERD-14VK103
10% ERD-14VK222
10% ERD-14VK102
10% ERD-14VK153
10% ERD-14VK182
10% ERD-14VK181
10% ERD-14VK180
10% ERD-14VK122
20% ERC-12BFM470
10% ERD-14VK821
10% ERD-14VK272
10% ERD-14VK222

Ref. No.
24
25
26
27
28
29
30
31
32
33
34
35
36
37
AADAADD AAD AAD AA DAD AW W
VARIABLE RESISTORS
VR 1
VR 2
VR 3
VR 4
VR 6
CAPACITORS
ANA AHRWHNH —
ae es ee
ON —- oO 0
OOOO AO AHO AHO OOO AAO O01 010000000
YNNNNNNNN HHH =
OBNIRABONA C0T®NAaAR
NO ‘oO
Description
Carbon Resistor
(appropriable)
3.3KQ 1/4 Watt 10%
Carbon Resistor’ ~» 3.9KQ. 1/4 Watt 10%
(appropriable)
Wire Wound Resistor
Carbon Resistor
Solid Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
Carbon Resistor
1.5.Q 1/2 Watt 10%
100 Q 1/4Watt 10%
10 Q 1/2 Wait 20%
2.7KQ 1/4Watt 10%
560 Q 1/4 Watt 10%
100 Q 1/4 Watt 10%
27KQ, 1/4Watt 5%
560 Q 1/4 Watt 10%
18KQ 1/4 Waitt 10%
47 Q, 1/4 Watt 10%
47.Q 1/4Watt 10%
Carbon Resistor 2.7KQ 1/4Watt 10%
Carbon Resistor 2.2KQ 1/4Wait 10%
- Carbon Resistor
Carbon Resistor
(appropriable)
Carbon Resistor
(appropriable)
Carbon Resistor
Variable Resistor
Variable Resistor
Variable Resistor
Variable Resistor
Variable Resistor
Electrolytic Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
Mylar Capacitor
Polystyrene Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
Polystyrene Capacitor
Mylar Capacitor
Mylar Capacitor
Polystyrene Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
Mylar Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
Mylar Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
Electrolytic Capacitor
1KQ 1/4 Watt 10%
1.8KQ 1/4 Watt 10%
560 Q 1/4 Watt 10%
100 Q 1/4 Watt 10%
20KQ-C
5KQ-C
2KQ-B
500Q-B
2K Q-B
3uF WV 15V
30uF WV 6V
5 uF WV 10V.
3uF WV. 15V
1uF WV 50V
0.047 uF WV 50V
680 PF_ WV 125V
10uF WV 6V
50 uF WV 10V
10vF WV 6V
100 uF WV 3V
500 wF WV 10V
560 PF_ WV 125V
0.0056 uF WV 50V
0.0056. uF WV 50V
3900 PF WV 125V
150 uF WV 15V
150 uF WV 15V
Aur WV 15V
0.1 uF WV 50V
200 uF WV. 6V
50uF WV 6V
0.001 uF WV 50V
5 uF WV 10V
5 uF WV 10V
50yF WV 3V
100 uF WV 15V
5 uF WV 15V
Part No.
ERD-14VK332
ERD-14VK392
ERW-12L1R5
ERD-14VK101
ERC-12BFM100
ERD-14VK272
ERD-14VK561
ERD-14VK101
ERD-14VJ273
ERD-14VK561
ERD-14VK183
ERD-14VK470
ERD-14VK4R7
ERD-14VK272
ERD-14VK222
ERD-14VK102
ERD-14VK182
ERD-14VK561
ERD-14VK101
EVH-BOA21C24
EVH-BOAL21C53
EVL-TOAAO0B23
EVL-TOAAO0B52
EVL-TOAA00B23
ECE-A15V3
ECE-A6V30
ECE-A10V5
ECE-A15V3
ECE-AS0V1IM
ECQ-M05473MZ
ECQ-S1681KZ
ECE-A6V10
ECE-A10V50
ECE-A6V10
ECE-A3V100
ECE-A10V500
ECQ-S1561KZ
ECQ-M05562MZ
ECQ-M05562MZ
ECQ-S1392KZ
ECE-A15V150
ECE-A15V150
ECE-A15V4l
ECQ-M05104MZ
ECE-A6V200
ECE-A6V50
ECQ-M05102MZ
ECE-A10V5
ECE-B15V5
ECE-A3V50
ECE-A15V100
ECE-B15V5

TRANSISTORS
Ref. No. Description Part No.
Te 1 Transistor 2SB 173(A)
Tr 2 Transistor 2SB 175(B)
ie 3 Transistor 2SB 175(B)
Tr 4 Transistor 2SB 324
Ir 5 Transistor 2SB 324
Tr 6 Transistor 2SB 172(A)
Tr 7 Transistor 2SB 175(A)
Tr 8 Transistor 2SB 175(A)
Tr 9 Transistor 2SB 176(R)
THERMISTORS
SM 1 Thermistor MT-81 QVM-800A
SM 2 ‘Thermistor 5A-120 QVM-201A
DIODE
D Diode OA-70
TRANSFORMERS
T oo Input Transformer QLA-0108-2
T 2 Output Transformer QLA-0325
T 3 Oscillator Transformer QLB-0108
T 4 Choke Transformer QLP-0105
SWITCHES
$< Slide Switch (Record/Play) ESD-1610
$ 2 Slide Switch (Head Connection) ESD-1610
S 3 Slide Switch (Monitor Selector) QSS-1002
S 4 Leaf Switch _
(Plunger Power/Stop Switch) QSB-0136
Ss Micro Switch (Power) QSM-0009
S 6 Leaf Switch (Instant Stop) QSB-0148
S -7 Leaf Switch (Remote Cut-off) | QSB-0146
Ss 8 Slide Switch (Auto/Manual) ESS-1013
S$ 10 Leaf Switch (Bias Cut-off) QSB-0149
MECHANICAL PARTS
Ref. No. Description Part No.
1 M750 Tape Guide Post Screw, Left QAG-1068
2 M751 Plastic Insulation Pipe QAG-1072
3 M752 Sensing Lug QAG-1069
4 M753 Tape Guide Washer, Left QAG-1070
5 M754 Tape Guide, Left QAG-1071
6 M755 Fiber Washer, 4.1 1.50.5 QAG-1073
7 M756 Tape Guide Plate Assembly —
8 M757 Fiber for Left Tape Guide QAG-1074
Q9 M758 Fiber Washer, 4.29.0 1.0 QBK-7017
10. M759 Nut, Left Tape Guide QAG-1075
15 M760 Washer for Head
Mounting Screw QWQ-1067
16 M761 Head Mounting Spring QBC-1035
17 M762 Head Mounting Plate Assembly, Left —
20 M763 Fiber Washer, 4.0K 7.0X 0.5 QBK-7067
21 M764 Pressure Pad Spring, Left QAP-1096
22 M765 Pressure Pad Assembly, Left —
23 M767 Tape Guide Post Screw, Right QAG-1076
24 M768 Tape Guide Washer, Right: QAG-1005
25 M769 Tape Guide, Right QAG-1008
26 M770 Tape Guide Plate, Right QAG-1077
27 M771 Tape Guide Collar, Right QAG-1078
28 M772 Head Mounting Plate Assembly, Right —
Ref. No.
29
30
32
33
36
37
39
40
41
42
43
45
46
47
48
49
50
51
53
54
54-1
55
56
58
59
60
61
62
63
65
44
66
67
68
69
70
71
72
73
74
75
76
a,
78
79
80
85
86
87
88
89
30
91
92
93
94
95
96
97
98
99
M773
M774
M775
M776
M777
M778
M779
M780
M781
M782
M783
M784
M785
M786
M787
M788
M789
M790
M791
M792
M793
M794
M795
M796
M797
M798
M799
M800
M802
M803
M804
M805
M806
M807
M808
M809
M810
M811
M813
M814
M815A
M816A
M817
M818
M819
M820
M695
M694
M821
M822
M823
M824
M825
M826
M827
M828
M829
M830
M831
M832
M833
Description Part No.
Pressure Pad Assembly, Right —
Pressure Pad Spring, Right QAP-1097
Duracon Washer, 4.1 X 5.50.5 QBJ-3027
Pressure Roller QDP-1097
Pressure Pad Lever Assembly _
Pressure Roller Lever Assembly =
Prersure Roller Lever Shaft QMS-1182
Pressure Roller Lever Spring QBN-1025
Pressure Roller Lever Spring Hook © —
Fiber Washer _=
Washer QTW-1019
Volume Control Holder —
Baseplate Assembly Upper —_—
Tape Counter Belt QDB-0051
Tape Counter QDC-0011
Hexagonal Nut, 1.3¢ a
Flywheel Bearing, Upper QMNM- 1087
Capstan Bearing Holder —,
Idler Wheel-A Spring QBP-1072 .
Upper Idler Wheel-A Assembly QxXI-0009
Felt for Upper Idler Wheel-A
Idler Wheel-A Washer
Lower Idler Wheel-A Assembly
Idler Wheel-A Belt
Idler Wheel-A Shaft
Reel Table Screw
QWQ-1069
QXI-0010
QDB-0052
QMS-1184
QHT-230 x 5C3
Reel Table Assembly Leff QXP-0124-1
Felt Assembly Left Reel Table —
Reel Table Shaft QMS-1185
Reel Table Assembly, Right QXP-0125-1
Pressure Pad See-saw Lever =
F.F. Roller Felt QBF-1084
F.F. Roller QDP-1099
F.F. Roller Lever Assembly —_
F.F. Roller Lever Spring QBT-1043
F.F. Roller Lever Shaft —
Fiber Washer, 5.0 9.0 0.5 QBK-7042
Brake Assembly, Left =
Brake Spring QBT-1146
Idler Wheel-B QxXI-0008
Idler Bracket-B Assembly —=
Idler Wheel-B Bracket _
Idler Bracket-A Assembly =
Motor Pulley QDP-1098
Flywheel Belt QDB-0053
Motor Bracket =
Pipe QKT-1119
Motor Mounting Rubber Cushion QBC-1055
Slide Switch Rod Assembly —
Brake Assembly, Right —
Brake Rod Assembly =
Brake Shaft =
Slide Switch Rod Bracket a
Capstan (3-3/4 ips.) QMP-1079
Flywheel QXF-0026
Steel Thrust Ball QDK-1001
Stay—B —
Stay-A _
F.F. Roller Rod a
F.F. Roller Rod Spring QBT-1147
Pressure Roller Lever-B Assembly

Ref. No. Description Part No.
100 M834 Rod Bracket-B —
101 M835 Rod Bracket-A ==
102 M836 _ Play Lever Spring—-A QBT-1148
103 M837 Play Lever Spring—B QBT-1149
104 M838 Play Rod-A =
105 M839 Play Rod-B Assembly —
106 M840 Play Lever Assembly —
107 M841 Instant Stop Rod —
108 M842 Instant Stop Spring QBC-1045
109 M843 Lever Meter Holder —
110 M844 Baseplate Assembly, Lower —
111 M845 Push Button Spring QBP-1071
112 M846 Push Button Assembly QXB-0042
113 M847 Play Button Assembly QXB-0043
114 M848 Push Button Holder Shafi-A —
115 M849 Push Button Frame Shaft —
116 M850 Push Button Lock Plate —
117 M851 Brake Wire QBI-1004
118 M852 Slide Switch Rod Spring QBT-1150
122 M853 Idler Wheel-A Bearing Holder --
123 M165 Hexagonal Nut, N8&@ QNN-8032B1
125 M854 Idler Wheel—A Shaft Bearing QMM-1088
126 M855 ~— Amplifier Mounting Angle —
127 M856 Plunger Rod —
128 M857 Split Pin _—
129 M858 Push Button Lock Spring QBP-1073
131 M859 Record Lever-B —
132 M860 Flywheel Bearing, Lower _—
133 M861 Push Button Frame Shaft, 2.5 —
134 M862 See-saw Metal —
135 M863 Instant Stop Metal os
136 M864 __ F.F. Rod Assembly os
137 M865 Flywheel Thrust Steel Ball —
138 M8éé6 Pressure Pad See-saw Lever Metal —
130 M867 Motor QDNM-0921
139 M868 = Capstan Holding Nut QHQ-1067
140 Ms8o Rubber Washer 59.0 0.6 QBG-1069
83 X160 Small Screw, —M2.6¢x 4 QHM-126 x 4U3
13 X162 Small Screw, —M2¢x 10 QHM-120 x 10U3
81 X166 Small Screw, —M2.6¢x 8 QHM-126 x 8U3
57 X167 Small Screw, —M2.6¢%10 QHM-126X 10U3
17 = Xi171 Small Screw, —M3¢@x 5 QHM-130 x 5U3
52 X175 Small Screw, —M3¢x 12 QHM-130 x 12U3
14 X190 Small Screw, —M2@x 6 QHM-120 x 6U3
18 xX194 Small Screw, —M2.6¢*18 QHM-126 x 8U3
121 = X334 Fiber Washer, 4.29.0 0.5 QBK-7033
35 X343 Fiber Washer, 7.0X 12.00.25 QBK-7037
64 X343 Fiber Washer, 7.0 12.00.25 QBK-7037
82 X363 Spring Washer, SW2.6¢ QWS-262T3
11 = Xx364 Spring Washer, SW3¢ QWS-302U3
119 X365 Spring Washer, SW4¢ QWS-402T3
124 X366 Spring Washer, SW8¢ QWS-802T3
84 X375 _ Flat Washer 2.6¢ QWP-2612N1
38 X384 E-type Washer, E4¢ QNS-404U3
34 X385 E-type Washer, E5¢ QNS-504U3
31 X387 E-type Washer, E3é QNS-404U3
12 Xx394 Hexagonal Nut, N3é QNN-3022U3
120 = Xx395 Hexagonal Nut, N4é QNN-4022U3
ELECTRICAL PARTS
151 £470 Normal Operation Head Assembly WY-007X
152 £471 Reverse Operation Head Assembly WY-007W
153 £472 Level Meter QSL-0021
154 £473 11-P Multi-connector QJS-0108
Ref. No. Description
155 £474 Jack, M3-B
156 £475 Jack Unit-B
157 £476 Midget Power Relay (S9)
158 £477 Plunger
159 £487 Speaker
160 £478 Printed Circuit Board-A
161 £479 Printed Circuit Board-B
162 £480 Printed Circuit Board—C
163 £482 Heat Dissipating Angle
164 £483 Heat Dissipating Cap
165 £484 Output Transformer Angle
166 £485 Record Lever-A
167 £481 Record Lever Spring
168 £486 Spacer-B (Head Height
Adjustment)
169 £444 Head Shielding Cover
CABINET PARTS
Part No.
QJA-0104
QJA-0111
QSK-0102
QME-0105
EAS-15D50SF
QEM-1003
QEM-1004
QEI-0074
QTT-179
QTH-1001
QTT-1205
QML-1152
QHT-1096
QTW-1006
QTS-1013-1
QYA-0042
QYB-0087
QGK-1083
QGK-1084
QKH-1022
QHYV-230 x 6Cl
QYK-0010
QHB-530 x 8U3
QWQ-1055
QBC-1063
QMS-1129
QHS-530 x 100V3
QYR-0047
QGO-4021-1
QEO-0049
QHM-240 x 20V3
QHQ-1046
QC3J-1048
QYT-0041
QYT-0043
Screw, Round Head M3¢* 10 QHM-230 x 10U3
180 G440 = Case Lid Assembly
181 G441 Case Body Assembly
181-1 G442 Case Side Plate, Right
181-2 G443 Case Side Plate, Left
181-3 G444 Handle
181-4 G445 — Small Screw, +MS3¢x 6
181-5 G446 — Front Panel Assembly
181-6 G447 Tapping Screw, +BH3¢x 8
181-7 G448 Washer
181-8 G449 Vibration Absorber
181-9 G450 Capstan Rest
182 G451 Case Bottom Assembly
182-1 G452 Pocket Lid Assembly
182-2 G453 Tapping Screw, +S$3¢x 10
183 G454 Head Cover Assembly
184 G455 CUE Button
185 G456 Battery Lid Assembly
186 G457 = Smali Screw, +M4¢x 20
187 G458 = Screw
188 G459 Jack Mount
189 G4é60 Volume Control Knob Right
191 G4é61 Volume Control Knob, Left
190 X174
ACCESSORIES
Al Dynamic Microphone (with Staind)
A 1-1 Microphone Stand
A 2 5” Recording Tape
A 3 5” Empty Reel
A 4 2 Pin Plug B
A 5 Magnetic Earphone
A 6 Connection Cord-R
A 7 Splicing Tape
A 8 Sensing Tape
A 9 Carrying Bag
A 10 Instruction Book
PACKING
P Packing Case
3 “Oo “oO “Oo “Oo *U “UO AN AaB WN —
(A)
(B)
(E)
Accessory Case
Paper Cushion (A)
Paper Cushion (B)
Gauze
Inner Cushion
Inner Cushion
Inner Cushion
WM-2095N
WN-105N
QFT-5NR49Z
QFR-5NZ
QJP-0910
QAE-1QB1
QEB-0017
QFS-0002-1
QFS-0004
QFK-0014
QTT-0196
QPN-1318
QPN-1233
QPN-1234
QPN-1238
QPW-1051
QPW-1052
QPW-1053
QPO-1010

TROUBLE
SHOOTING
GUIDE
1
MALFUNCTIONS
IN
RECORD/PLAYBACK
MOTION
DEFECTIVE MOTOR WINDING |
BEARING
DEFECTIVE MOTOR SHAFT
!
MOTOR DOES
NOT ROTATE
$2-4,82-5
POOR SWITCH CONTACT,
CAPSTAN DOES
INSUFFICIENT PRESSURE ROLLER PRESSURE
EXCESSIVE BACK TENTION
DIRTY PRESSURE ROLLER SURFACE
ROTATE
COIL, T4
DEFECTIVE CHOKE
]
When in
Normal
Forward
Mode
MOTOR DOES
RATATE
When in
Reverse
Forward
Mode
PUSH BUTTON
OPERATES
CAPSTAN DOES
NOT ROTATE
PUSH BUTTON
DOES NOT
OPERATE
DOES NOT
REVERSE
TAPE
MOTION
REEL TABLE DOES
NOT ROTATE
BINDING PUSH
BUTTON
DEFECTIVE PUSH
BUTTON MECHANISM
MANUAL REVERSE
BUTTON DOES
NOT OPERATE
MANUAL REVERSE
BUTTON DOES
OPERATE
WORN OUT PRESSURE ROLLER SHAFT
LOOSE MOTOR PULLEY HOLDING SCREW
DEFECTIVE FLYWHEEL BEARING
INSUFFICIENT IDLER WHEEL PRESSURE
IDLER WHEEL SHAFT OUT OF LUBRICANT
DIRTY IDLER WHEEL SURFACE
LOOSE CAPSTAN HOLDING SCREW
DEFECTIVE RIGHT REEL PLUNGER
OPERATION
DEFECTIVE DRIVE BELT
REEL TABLE OUT OF ALIGNMENT
BINDING REEL TABLE
REEL TABLE SHAFT OUT OF
‘| LUBRICANT
INSUFFICIENT PRESSURE
BETWEEN CAPSTAN AND
PRESSURE ROLLER
EXCESSIVE BACK TENSION
DIRTY PRESSURE ROLLER
SURFACE
WORN OUT PRESSURE ROLLER
SHAFT
PRESSURE ROLLER SHAFT OUT
OF LUBRICANT
RIGHT REEL
PLUNGER
DOES
OPERATE
DEFECTIVE
REVERSE
PUSH BUTTON
CAPSTAN
DOES ROTATE
IN REVERSE
DIRECTION
DEFECTIVE
SENSING POLE
DIRTY OR OILY
SENSING FOIL
SURFACE
DEFECTIVE PLUNGER
| DEFECTIVE SWITCH $2
LOOSE MOTOR PULLEY
HOLDING SCREW
DEFECTIVE FLYWH EEL BEARING
INSUFFICIENT IDLER WHEEL
PRESSURE
CAPSTAN
DOES NOT
ROTATE IN
REVERSE
DIRECTION

TROUBLE SHOOTING GUIDE 2
DEFECTIVE RECORDING CIRCUIT
ILS
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TROUBLE
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GUIDE
3
DEFECTIVE
PLAYBACK
CIRCUIT
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