Matsushita Electric NATIONAL RQ-152S User manual

NATIONAL
TAPE RECORDER
SERVICE MANUAL
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MODEL RQ-152S8
A.C D.C 2 SOURCE TAPE RECORDER
CONTENTS
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MATSUSHITA ELECTRIC
JAPAN

Supply Reel
Operating Lever
Counter Reset Button
Index Counter
V.U Meter
Record Button
Fast Forward Button
SPECIFICATIONS
Power Source:
Audio Output:
Transistors:
Recording System:
Erasure System:
Track System:
Monitor Systen:
Tape Speeds:
Frequency Response:
Input Impedance:
Output Impedance:
Playing Time:
Battery Life:
Recording Level Indicator:
Built-in Speaker:
Dimensions:
Weight:
PARTS LOCATION
Volume Control Knob
Tone Control and Monitor Switch Knob
A.C. or Battery Powered A.C. 110V, 220V
Battery 9V 6 Batteries
700 mW (1W maximum)
2SB-173(1) 2SB-175(2)
A.C. Bias 35 K Cycles
D.C. Erase
2 Track System
Sound Monitor System
3-3/4 i.p.s. and 1-7/8 i.p.s.
100~7,000 c/s at 3-3/4i.p.s.
100~4,000c/s at 1-7/8i.p.s.
Microphone 20 KQ
Auxiliary “RADIO” 100 KQ
Extension Speaker Jack “EXT.SP” 8
1 hour at 3-3/4 i.p.s. with 5” Tape (600 ft)
2 hour at 1-7/8i.p.s. with 5” Tape (600 ft)
More than 30 hours (using NATIONAL “‘Hi-Top” Batteries)
V.U Meter
3-5/8” Dynamic Speaker
11-3/4” (W) x 10” (D) x 3-1/2” (H)
6-3/4 Ibs. without Butteries
2SB-178(2) 2SB-172(1)
Takeup Reel
Capstan Rest
Capstan
External Speaker Output Jack
Radio Jack
Microphone & Remote Control Jack

BLOCK DIAGRAM OF ELECTRICAL CIRCUITS
RECORDING CIRCUIT
MONITOR
Sound
Monitor SW.
SPEAKER
Negative
Feedback
Feedback Devel
Control
irs
re
Lote 2SB-175
2SB-173
2SB-175
Output ~~
Transformer Tr5 Transformer
2SB-178
“B” Transistor
Tr6 Power Source
2SB-172
Erase
A.C Power Source
PLAYBACK CIRCUIT
Negative
Feedback
Tr4
Equalization
Tone
Control
MONITOR
©
Volume
Playback Control
Head
SPEAKER
Tri r
2SB-173 2SB-175
* Input Out put
Transformer Trd5 Transformer
2SB-178
A.C
Power
Source
“B”
Transistor
Power
Source
L.------Q

DISASSEMBLY INSTRUCTIONS
BOTTOM COVER
A.C Power Cord
Compurtment Cover
Battery Compartment Cover
1. Turn the set upside down.
2. Undo the fixing screws 3 pcs. (A) of the Bottom Cover
and the fixing screws 2 pcs. (B) inside of the Battery
Case.
3. If it is lifted from the hinge side, the Bottom Cover
can be removed.
Note: Attention must be paid to lead wire from
Battery.
MAIN CABINET BODY CASE
Headcover Ds Sleeve 3-3/4 i.p.s.
COUNTER
‘cool
Operating Lever
1. Remove the operating Lever and the capstan sleeve
3-3/4 i.p.s.
2. Remove the Bottom Cover.
. Undo chassis fixing screws 6 pcs. (C).
4. Ho!d the Flywheel of chassis, and pull it up slopewise
from Reel Table side.
Ww
Note: Attention must be paid to lead wire from
speaker.
MOTOR
Position of
Indentifying Mark 8 |
. Remove the Motor Spring from the Motor.
. Remove the 3 Motor Lead wires (Yellow, Red and Blue.)
. Remove 2 screws (D) holding Motor Holder.
. In doing so mark the original position of the Holder
first.
When replacing the Motor, fit it to the position marked
When removing the old Motor, then test the tape
speed.
BWNEH

FLYWHEEL
(5) Paper Washer
1. Remove Paper Washer
and Stop Ring on the
Flywheel Shaft(Capstan).
Takeup Reel Table
Takeup Belt
Guide Pulley-A
2. Remove the Rubber Belt from the Guide Pulley-A.
(E) Sub Base Plate
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ol pS SS ‘|
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Clutch Lever Spring
Catch Lever Spring
3. Remove the Catch Lever Spring and the Clutch Lever
Spring.
4. Remove the 3 screws (E) holding the Sub Base Plate.
oO
. Remove the Sub Base Plate.
6. Pull the Flywheel upward.
When replacing the
Flywheel, always install new
Flywheel.
Thrust Ball and Paper Washers on the Flywheel Shaft
Flywheel Thrust Ball
MECHANICAL OPERATING
CONTROLS
SINGLE LEVER CONTROL
All electrical and mechanical functions are performed by
the single, 4 position Operating Lever. The batteries are
disconnected in the STOP position.
a
Turning the Operating Lever counter-clockwise to the
PLAYBACK position switches the Amplifier ON and
actuates the tape transport mechanism to properly
Playback a recorded tape.
. Turning the Operating Lever counter-clockwise to the
REWIND position switches the Amplifier OFF and
actuates the mechanism to cause transport of the tape
onto the supply reel.
. Pressing the Record/Lock Button and turning the
Operating Lever to RECORD actuates the tape transport
mechanism and switches the electrical circuits, to
enable the signal from the microphone to be recorded.
Record/Lock Button is a safety locking device to
prevent accidental erasure.
. Volume Control is used to adjust the recording level
and volume of the reproduced sound. It is not connected
to the Power Switch.
. V.U- Meter/Battery Voltmeter functions as a dual
purpose meter. With the Operating Lever in the RECORD
position, the meter functions as a V.U Meter and
indicates the recording level. In the PLAYBACK position,
the meter functions as a Voltmeter and measures the
Voltage output of the batteries.
. The Model RQ-152S is equipped with a self-contained
AC power supply and a unique relay circuit which
allows automatic switching from AC to Battery power
and vica-versa.
S4 is the AC to Battery switch contacts and normally
is in the Battery position. When AC power is applied,
S4 contacts are switched to the AC position by the
Relay.

TAPE TRANSPORT OPERATION
PLAYBACK
(Takeup Reel Reel Table) Guide Pulley(L
Guide Pulley(S))
Pinch Roller Lever
an)
Clutch Lever
( ¢ am Plate
Supply Reel Table
Rubber of Belt Return
Stopper Lever
Rewind Belt
Rewind Pulley )—.
Sub_F.F.Lever
When the operator is adjusted to playback condition by
turning the Operating Lever, the following movements
occur at one time to feed tape at a constant speed for
obtaining playback.
1. Clutch Lever acts, power source is switched on, Motor
Lifter is freed from suppression, Motor is pressed on
Flywheel, and motor rotation is transmitted to Flywheel.
2. Rotation transmitted to Flywheel turns Takeup Reel
Table by Takeup Belt and Sub Takeup Belt.
3. Pinch Roller Lever acts and makes Pinch Roller stuck
to Capstan Shaft. With rotation of Capastan Shaft
which is conjointly shaft of Flywheel, Pinch Roller is
rotated to feed tape at a constant speed.
4 Pinch Roller Lever moves pad arm and Pinch pad
to Head.
5. Pinch Roller Lever moves Sub F.F. Lever and F.F. Roller
Lever, and separates F.F. Roller from Takeup Reel
Teble.
6. Rewind Lever is actuated, Rewind Pulley is separated
from Flywheel, and playback circuit is switched on.
7. Sub Clutch Lever operates, moves Belt Return Stopper
Lever and separates rubber of Belt Return Stopper
Lever from Supply Reel Teble.
8. Catch Lever operates and fixes operator.
RECORD
{Oca Cam)
eens | Recording
(Record Button ee ) Cl
Recording Lever
Recording Cam
Push the Button for recording, turn the Operating Lever,
and adjust the operator to recording position. Then, same
operations as in playback begin simultaneously and tape
is fed at a constant speed. At the same time, Recording
Lever is moved with Recording Cam, Slide Switch is
actuated, electric circuit is changed over to recording
condition, and thus recording is obtained.
FAST FORWARD
Guide Pulley L_)
(E-F-Rolter)
F.F.Roller Lever
Guide Pulley (S)
Takeup Reel Table
Friction Pulley:
FF. Pulley
(Sub Takeup Belt)
Belt Y —
(Takeun Belt) —. (ier Pulley
(Fivwheet)
> Gutch Lever)
{Clutch Lever)
(Cam Plate)

Takeup Reel Table
=n F.F.Roller
eal
Sub Takeup Belt
Friction Pulley
Push the F.F. Button, turn the operating Lever, and
adjust the operator to Fast Forward condition. Then
the following operations begin simultaneously for F.F.
of tape.
1. Clutch Lever operates, power source is switched on,
Motor Lifter is freed from suppression, Motor is pressed
on Flywheel and motor rotation is transmitted to
Fly wheel.
2. Rotation transmitted to Flywheel turns Friction Pulley
under Takeup Reel Table by Belt, the rotation is
transmitted to F.F. Roller and its rotation to F.F. Pulley.
As F.F. Pulley is fixed at Takeup Reel Table, the Reel
Table quickly rotates.
3. Sub Clutch Lever operates, moves Beit Return Stopper
Lever, and separates Rubber of Belt Return Stopper
Lever from Supply Reel Table.
4. Catch Lever works and fixes operator.
REWIND
Rewind Belt
Supply Reel Table
Rewind Pulley
(Rewind Lever
Takeup Lever
Clutch Lever
Takeup Reel Table
(ub Clutch Lever
Flywheel
(Takeup Lever)
Catch Lever
"(Cam Plate)
Turn the Operating Lever for putting the operator to
rewinding condition. Then the following operations
simultaneously occur, and the tape is quickly rewound.
1. Catch Lever operates, power source is switched on,
Motor Lifter is freed from suppression, Motor is pressed
on Flywheel, and Motor rotation is transmitted to
Fly wheel.
2. Rotation transmitted to Flywheel is further transmitted
to Rewind Pulley which is pressed on Flywheel, and
Supply Reel Table is turned to rewinding direction by
Rewind Belt.
3. Takeup Lever operates, separates Sub Takeup Lever,
F.F. Roller Lever and push F.F. Roller from Takeup Reel
Teble, putting the Takeup Reel Table in freed condition.
4. Sub Clutch Lever operates, moves Belt Return Stopper
Lever, and separates Rubber of Belt Return Stopper
from Supply Reel Teble.
5. Catch Lever operates and fixes operator.

STOP
Supply Reel Table
F.F Roller Lever
Belt Return Stopper
Lever
(Takeup Reel Table
— (Sub Takeup Belt)
Rewind Belt) ~
: aa _— (idler Pulley)
(Rewind Pulley’. 4
\ :
Takeup Belt)
=F Whee)
Rewind Lever). :
Sub Clutch Lever\ ~
Spring
Sub Clutch
Lever
( Pinch Rollet
Motor Lifter
Sub F.F.Lever)
Pinch Roller
___Spring/ :
Takeup Lever \
Sprin,
(
Ll
Soe
)
4)
~
(Chutch
Lever
Spring
<=
(Catch Lever Spring) (FF Lever)
Pinch Roller
Lever_
= —— (Catch Lever)
(Rewind Lever
From the status of Record/Playback, quick feed or Rewind-
ing, if the Operating Lever is turned and the operator
is adjusted to stopping condition, the following movements
occur simultaneously, power source is switched off, and
operation come to a stop.
1. Clutch Lever works, power source is switched off, Motor
Lifter is suppressed, and Motor is separated from Fly-
wheel.
2. In case of stopping from Record/Playback, Rewind
Lever works, circuit for Record/Playback is cut off,
and Rewind Pulley is pressed on Flywheel.
Pinch Roller Lever works, Pinch Roller is separated
from Capstan Shaft, and the Pinch Roller Lever also
actuate pad-up for separating pad from bed.
By operation of Pinch Roller Lever, Sub F.F. Lever
and F.F. Roller Lever are actuated to press F.F. Roller
on Takeup Reel Teble which serves as a_ brake.
Sub Clutch Lever and Belt Return Stopper Lever work
to press Rubber of Belt Return Stopper of Supply Reel
Table for braking.
3. In case of stopping from Fast Forward, Rewind Lever
works, and Rewind Pulley is pressed on Flywheel. Sub
Clutch Lever and Belt Return Stopper Lever work to
press Rubber of Belt Return Stopper on Supply Reel
Table for braking.
4. In case of stopping from rewinding, Takeup Lever and
Sub Takeup Lever work to press F.F. Roller on Pulley
of Takeup Reel Table.
Braking is effected when F.F. Roller comes in touch
with Pulley of Takeup Reel Table.
MECHANICAL ADJUSTMENTS
PINCH ROLLER TENSION
Pinch \
Roller /
Pinch Roller Lever
Fig: 1
Instruments Required: Spring Scale; Strong Twine.
Measurement: Refer to Fig. 1.
1. Load the tape as in the case of Playback, and set
the Tape Recorder in Record or Playback mode.
2. Hang a loop of twine on the Pinch Roller Shaft and
hook the Spring Scale on the other end of the loop.
3. Pull the Spring Scale in the direction of a line connecting
the centers of the Capstan and Pinch Roller Shaft,
and Pinch Roller Shaft, and increaring the pull slowly
read the scale at a point where the tape stops moving
by the pull.
4. The standard pressure of the Pinch Roller Shaft
should be:
Ve 7/BADS was sctesseacces 5.3~7.40zs. (150~210 g)
323) 4iIDSiseccseonneee 5.7~8.5 0zs. (160~240 g)
ADJUSTMENT
Adjust the Pinch Roller Spring to the standard pressure
accordingly.
TAPE PAD PRESSURE
Tension
Gauge
Fig. 2

Tension Gauge
Fig. 3
Instrument Required: Tention Gauge
Measurement: Refer to Fig. 2. and 3.
1. Set the Tape Recorder in Playback mode without
loading the tape.
2. Hook the Tension Gauge on the Tape Pad for the
Record/Playback Head at the center and lightly pull the
gauge so that the pad parts from the head. Take the
reading just at the point where the pad parts from the
head.
3. The standard pressure of the pad for the Record/
Playback Head should be:
0.2~0.5 ozs. (6~14 g)
ADJUSTMENT
Adjust the Tape Pad Arm Spring to the standard pressure.
WINDING TORQUE FOR PLAYBACK AND FAST
FORWARD
LTape”
— et
Flywheel) 7 Tape)
(Pressure Roller {| oe -. —
pia = a ‘Tension
(Splicing Tape) A (~ Gauge
Fig. 4
Instruments Required: Tension Gauge; Splicing Tape
Measurement: Refer to Fig. 4.
1. Make a loop of the tape (5” reel) end, fasten the
looped end with the splicing tape, and put the reel
on the Takeup Reel Table.
2. Hook the Tension Gauge on the loop and pull out 6
inches or so of the tape end.
3. Setin the Playback or Fast Forward mode, and pull
the Tension Gauge in the direction of winding keeping
the pace with the moving tape until the reading of
the Tension Gauge remains constant at which point
take the reading. Repeat this for several times and
take the average for a correct torque.
4. The above test should be made with 5” tape reel
with full load.
5. The standard torque should be:
Playbackiscsscsaccen: 0.53~0.7l ozs. (15~20g)
Fast Forward......... 0.71 ozs. ~(20g~)
ADJUSTMENT
Reel Table Decorative
Screw
Reel Table Spring
Reel Table)
F.F.Fiber
Washer
Washer
F.F.Pulley
Friction Washer
Friction Pulley
Friction
Spring Friction Pulley Nut
Fig. 5
Adjust the torque with the Friction Spring on the Takeup
Reel Table. If the torque is too strong, loosen the Friction
Spring, and if too weak tighten it. If the Friction Washer
gets oily clean it immediately to prevent slip. If the tension
of the Takeup Belt is weakened the winding torque
drops.
BACK-TENSION FOR PLAYBCK
Fig. 6

Instruments Required: Tension Gauge; Splicing Tape
Measurement: Refer to Fig. 6.
1. Measure the back-tension in the manner similar to the
winding torque for Playback, but in this case by
pulling the tension gauge on the 5” tape loaded on
the Supply Reel Table.
2. Measure the back-tension for Playback with 5” reel
fully loaded.
3. The standard back-tension should be:
0.05~0.25 ozs. (1.5~6.5 g)
ADJUSTMENT
Too strong back-tension may be caused by the accumu-
lation of dust on the turning parts of the Rewind Pulley
and Supply Reel Table, requiring occasional cleaning. Too
weak back-tension may be due to the weakened tension
of the Rewind Belt and it should preferably be replaced
then.
MOTOR SHAFT PRESSURE AGAINST FLYWHEEL
“Motor ‘Spring }
(Tension Gauge)
(Flywheel)
Fig. 7
Instrument Required: Tension Gauge
Measurement: Refer to Fig. 7.
1. Load the tape and set the Tape Recorder in Playback
mode. Hook the Tension Gauge on the end of the Motor
Spring attached to the Motor (see the drawing).
2. Pull the Tension Gauge opposite to the action of the
spring and increase the pull until the Flywheel and the
Motor Pulley part from each other at which point take
the reading. The tape stops then.
3. The standard pressure for the Motor:
2.5~3.5 ozs. (7O~100 g)
ADJUSTMENT
Adjust the motor spring for correct pressure.
HEAD ADJUSTMENTS
Relative positions of heads and tape,
Adjust the relative positions of Record/Playback head
and Erase head as shown in the drawing.
Improper relative positions of these heads causes imperfect
erasure and cross-talk, and the slightest displacement of
the mounting may lead to the lowe position of the head
in respect of the tape. Close adjustment is therefore
necessary.
0.04~0.16 0~0.12
Erase
Head Record/Playback
Head
Fig. 8
Unit: Inch
HEAD AZIMUTH ADJUSTMENT
Slit Head Adjustment Screw
Fig. 9
Deflection of the angle of the head slit from vertical will
deteriorate high frequency characteristic on playing back
the tape with recording made with another Tape Recorder,
while it is not so important with the tape recorded and
played back on one and the same Tape Recorder. The higher
the deflection, the poorer the poorer the perfomance.
To prevent this trouble, the slit of the head should be
maintained precisely at right angles to the path of the
tape.
Connect the Vacuum Tube Voltage Meter (V.T.V.M.) with
8 Q Resistor in parallel to the Monitor Jack, and playback
the standard alignment tape (tape with recording of
signals, 3,000 cps. at 3-3/4 ips. on vertical slit ).
Adjust the angle of the head slit to be precisely vertical
by turning the adjusting screws so as to obtain the
maximum output signal.
When the Record/Playback Head is replaced it must be
adjusted as described above.
TREATMENT AFTER ADJUSTMENT
Lacquer-lock all the holding and adjustng screws of the
heads after the adjustment has been completed.

AMPLIFIER ADJUSTMENTS
RECORD BIAS FREQUENCY
Lissajous
Figure
Fig. 10
Instruments Required: Oscilloscope; A.F. Oscillator; 100 Q
Resistor.
Measuring Circuit: Refer to Fig. 10.
Connect a 100 Q Resistor in series to the ground side of
the Record/Playback Head, and compare the frequency
of voltage at both ends of the resistor with the frequency
of the A.F. Oscillator.
To compare, make the oscilloscope form a Lissajou’s Figure,
and bringing the frequency of the A.F. Oscillator close to
50 kc, watch the point at which the circle of the Lissajou’s
Figure stands still which is the frequency to be measured.
The standard frequency is: 30~40 kc.
If any frequency without the above range occurs, turn
slowly the core of the Oscillator Transformer (T3) until
the frequency remains within the range, tuning with the
frequency of the A.F. Oscillator.
RECORD BIAS CURRENT
RECORD / PLAYBACK
RECORD MODE
Fig. 11
Instruments Required: V.T.V.M.; 100 Q Resistor
Measuring Circuit: Refer to Fig. 11.
After adjusting Record bias frequency, connect the V.T.V.M.
to both ends of 100 Q Resistor, and confirm if the Record
bias current is 0.9~1.1 mA. Voltage at both ends of
100 Q Resistor is 0.09~0.11 V.
If the Record bias current is without the above range,
correct it by varying the Record bias frequency within
the range of 25~35 kc.
When all the measurement is finished the original wiring
on the heads should be restored. Care Should be taken
to keep correct polarity so as to avoid distorsion noise.
ERASE CURRENT
Erase Head
RECORD MODE
D.C Milliammeter
Fig. 12
Instruments Required: D.C. milliammeter
Measuring Circuit: Refer to Fig. 12.
Connect thh D.C. milliammeter in series to the ground side
of the Erase head.
When the Tape Recorder is set in Record mode, D.C.
milliammeter will indicate Erase current. The standard
Erase current is between 4~8 mA.
RECORDING LEVEL
RECORDING
AMPLIFIER
Fig. 13
Instruments Required: A.F. Oscillator; Attenuator ; V.T.V.M.;
600 Q and 100 Q Resistors
Measuring Circuit: Refer to Fig. 13.
Remove the soldered lead wire from No. 3 of the Oscil-
lator Transformer (T3) and stop the bias oscillation.
Set the Tape Recorder in Record mode and turn the volume
control knob to the maximum.
Measure the recording level necessary to feed 0.05mA
to the Record-head from the input jack.
Connect a 100 Q Resistor to the ground side of the
Record head, and adjust the attenuator so that the voltage
at both ends of the resistor is maintained at 0.05 V, and
confirm if its value is —64.5~— 74.5 db. Also confirm the
indication of the V.U. meter which should be —3~+3 db.
—— 10 —

TROUBLE SHOOTING GUIDE 1.
DEFECTIVE RECORD/PLAYBACK
DEFECTIVE OPERATION OF MECHANISM
OPERATING LEVER
FAILS TO MOVE
OPERATING LEVER
MOVES
MOTOR FAILS
TO ROTATE
DEFECTIVE
PRESS OF
PINCH ROLLER
CAPSTAN
ROTATES
MOTOR ROTATES
SHORT OF OIL
DEFECTIVE
MOTOR
ABNORMAL PINCH ROLLER
WOW, FLUTTER DEFORMED
FLYWHEEL
SHAFT
SLACKENED
MOTOR PULLEY
DEFORMED OR
STAINED
WITH OIL
DEFECTIVE CAM
MECHANISM
BATTERY
CONSUMED
FUNCTIONING OF
ScniNe SWITCH
-2
PEY WHEEL
SHAFT BURNT
DEFECTIVE
MOTOR
SPRING
DEFECTIVE
OPERATION
OF MOTOR
CIE T
SHAFT SHORT
OF OL
SLACKENING
OF FLYWHEEL
SHAFT
FRICTION
PULLEY BURNT
REEL TABLE
SHAFT
BURNT
WINDING
FORCE
a a DEFECTIVE
DEREC TINE OPERATION OF
FRICTION
SUPPLY PULLEY
WASHER BRAKE
REWIND AND
COUNTER BELT
OUT OF PLACE
DEFECTIVE
FRICTION
SPRING
RUBBER BELT
BROKEN,
DETERIORATED
OR’ OUT OF
PLACE
DEFECTIVE
OPERATION OF F.F
ROLLER CEVER
COUNTER SHAFT
BURNT
RELAY PULLEY
& GUIDE
PULLEY BURN
DEFECTIVE
MOVEMENT OF
TAKEUP LEVER

TROUBLE SHOOTING GUIDE 2
E SHAFT BENT
TAKEUP REEL TABLE
BURNT OR SHORT OF OIL
REWIND REEL TABLE
FAILS TO ROTATE
DEFECTIVE OPERATION OF
DEFECTIVE REWIND
MECHANISM
ERATION OF
E OPERATION OF
ER LEVER
DEFECTIV
FF. ROLE
BURNT OR
Y BRAKE FAILS
BROKEN OR
T BROKEN OR
EY.
PRESS OF
E SHAFT BENT
LL
TAKEUP BELT OUT OF PLACE
F.F. ROLLER FAILS
SUPPLY REEL TABLE
OR RUNNING SHORT OF OIL
COUNTER BELT OUT OF PLACE
COUNTER SHAFT BURNT
TAKEUP REEL TABLE
BURNT OR SHORT OF OIL
TO COME OFF
DEFECTIVE MOTOR
TAKEUP REEL TABLE
FAILS TO ROTATE
MOTOR FAILS
TO ROTATE
SUPPLY PEEL TABLE
FAILS TO ROTATE
DEFECTIVE FAST FORWARD
DEFECTIVE OPERATION OF
MECHANISM
REWIND IS NOT
OBTAINABLE
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TAKEUP REEL TABLE
ROTATES
FORWARD
DEFECTIVE WOVEM
ENT_OF SPRING
TIVE SILICON
DEFECTIVE
SWITCH S3
COUNTER_AND_REWIND BELT
RELAY
OUT OF PLACE
COUNTER SHAFT BURNT
DEFECTIVE'F.F. LEVER
ECTIVE SILICON
DE
RELAY VIBRATES
WHEN HALTING AT A.C
ABNORMAL RECORD/PLAYBACK
DEFECTIVE OPERATION OF
ELECTRIC CIRCUIT

TROUBLE SHOOTING GUIDE 3.
ABNORMAL PLAYBACK
DEFECTIVE OPERATION OF ELECTRIC CIRCUIT
DISTORTION 1S
LARGE AND
SOUND IS
SMALL
NO SOUND
1S HEARD
PLAYBACK 1S
OBTAINABLE,
BUT SOUND IS
DISTORTED
LOUD NOISE
LOUD
HUMMING
IPOWER SOURCE
CHECK VOLTAGE
AND CURRENT
AT EACH PART
NO CLICK AT
Tr-1 BASE
DEFECTIVE A.C.
IGLAND PACKING
OF AMPIFIER
MECHANISM
DEFECTIVE
ICAPACITY OR
WIRE - BREAKAGE
OF CAPACITOR
DEFECTIVE
CAPACITY OR
WIRE -
BREAKAGE OF
CAPACITOR
NO SOUND 1S
HEARD DUE TO
ABNORMAL
VOLTAGE, OR
LARGE
DISTORTION
VOLTAGE !S
NORMAL, BUT
SOUND IS SMALL
TONE CONTROL
1S DEFECTIVE
TONE CONTROL
1S INEFFECTIVE
VOLTAGE 1S DEFECTIVE
NORMAL, BUT NO
SOUND 1S
HEARD
DEFECTIVE
PLAYBACK
HEAD
DEFECTIVE
SLIDE SWITCH
$1-1, $1-2
SLIDE SWITCH
SHORT CIRCUIT
OF CAPACITOR
c3
DEFECTIVE
CARACITY OR
WIREBREAKAGE
OF CAPACITOR
c2
INPUT TRANS-
FORMER T-1l
DEFECTIVE
OUTPUT TRANS
FORMER T-2
DEFECTIVE
DEFECTIVE
INPUT TRANS.
FORMER T-l
DEFECTIVE
SPEAKER
DEFECTIVE
DEFECTIVE
RESISTOR
R5, R6
DEFECTIVE
CAPACITY OR
WIRE BREAKAGE
OF DE COUPLING
CAPACITOR
c10,C11,Cl
DEFECTIVE
RESISTOR
R5,R6, R7
DEFECTIVE
VARIABLE
RESISTOR
VR-1
DEFECTIVE
CAPACITOR
c4,C5
DEFECTIVE
SLIDE SWITCH
$1-2
DEFECTIVE
INPUT
TRASFORMER
T-1
DEFECTIVE
COLLECTOR
RESISTOR
R2,R10
DEFECTIVE
EMITTER
RESISTOR R4,R11
R17,R18, R22
DEFECTIVE BASE
BREEDER
RESISTOR R9,R12,
RPS, R20, R22,
DEFECTIVE DE
COUPLING RESISTOR
R12, R19, R23
DEFECTIVE
ISOLATION OR SHORT |
CIRCUIT OF
CONNECTING
CAPACITOR
c2,C7, C8,
ISOLATION OR
SHORT CIRCUIT
OF CAPACITOR
c5,C7, C12,C13
DEFECTIVE
ISOLATION OR SHORT
CIRCUIT OF DE
COUPLING CONDENSER
c1,C010,C11
DEFECTIVE
THERMISTOR

TROUBLE SHOOTING GUIDE 4.
ABNORMAL RECORD
DEFECTIVE OPERATION OF ELECTRIC CIRCUIT
IMPERFECT
ERASING
DEFECTIVE
ERASE HEAD
BATTERY
CONSUMED
1S HIGH
FREQUENCY BIAS
OSCILLATION
ABNORMAL ?
RECORDING 1S
OBTAINABLE,
BUT SOUND !S
DISTORTED
CHECK VOLTAGE
AND CURRENT
OF EACH PART
TONE CONTROL !1S
DEFECTIVE WHEN
RECORDING
DEFECTIVE
SLIDE SWITCH
LEVEL METER
SWINGS WHEN
INPUT IS
GIVEN
RECORDING !S
NOT
OBTAINABLE
LEVEL METER
DOES NOT
SWING THOUGH
INPUT 1S
GIVEN
RECORDING !S
NOT SWING
DEFECTIVE
RESISTOR
R29
DEFECTIVE
DIODE OA-70
DEFECTIVE
SLIDE
SWITCH S1-3
DEFECTIVE
METER
LEVEL METER
SWINGS
RECORDING !S
OBTAINABLE,
BUT NO SOUND
MONITORING !S
ATTAINABLE
LOUD NOISE
HIGH FREQUENCY
BIAS CURRENT
1S NORMAL
LITTLE OR NO
ELECTRIC
CURRENT OF HIGH
FREQUENCY BIAS
CHECK
VOLTAGE OF
OSCILLATION
CIRCUIT
DEFECTIVE
RESISTOR R24
BREKAGE OF
THIRD COIL OF
OUTPUT
TRANSFORMER T-2
BREAKAGE OF
SECONDARY COIL
OF OSCILLATION
COIL T-3
NO CLICK AT
BASE OF
TRANSISTOR Tr-l
CLICK IS
HEARD AT BASE
OF TRANSISTOR
Tr-1
DEFECTIVE
SLIDE SWITCH
S$1-6
DEFECTIVE
RESISTOR
R30
DEFECTIVE
SWITCH S7
DEFECTIVE
MONITOR
JACK
DEFECTIVE
DEFECTIVE
RECORD
RECORD
HEAD
HEAD
DEFECTIVE
PATTING OF
RECORDING
DEFECTIVE
OSCILLATION
cOoIL T-3
DEFECTIVE
DEFECTIVE
CAPACITOR
c14,C19
DEFECTIVE
SLIDE SWITCH
Sie Si=2:
IS
NORMAL
DEFECTIVE
ABNORMAL
TRANSISTOR
VOLTAGE TR-6
DEFECTIVE
RESISTOR
R25,R26, R27
DEFECTIVE
CAPACITOR
c16,C18s
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P>mmM<mMIDAMM ANVDOQ MPoD MAAPAVZOX
DEFECTIVE
OSCILLATION
COIL T-3
DEFECTIVE
MICROPHONE
DEFECTIVE
MICROPHONE
JACK SWITCH S1-5
DEFECTIVE SLIDE
DEFECTIVE
SLIDE
SWITCH
WIRE -BREAKAGE
OF CAPACITOR
c2
SHORT CIRCUIT
OF CAPACITOR
c3
CONTACTING BETWEEN
MICROPHONE JACK AND
MICROPHONE PLUG
(GLAND SIDE)
REFER TO’LOUD
NOISE “OF e
DEFECTIVE
PLAYBACK

REPLACEMENT PARTS LIST
ATTENTION: Please order Replacement Parts according to this Replacement Parts List. The parts
which are not listed up here will not be supplied. So a part in an assembly has to be ordered
as a whole assembly.
RESISTORS
Ref. No. Description Parts No.
R 1 Carbon Resistor 22KQ, 1/4 Watt 10% QRD-14TRK223
R22 Carbon Resistor 10KQ 1/4 Watt 10% QRD-14TRK103
Re 3 Carbon Resistor 120 Q 1/4 Watt 10% QRD-14TRK121
R 4 Carbon Resistor 1.2KQ 1/4 Watt 10% QRD-14TRK122
Re =5 Carbon Resistor 2.2KQ 1/4 Watt 10% QRD-14TRK222
R 6 Carbon Resistor 1.2KQ 1/4 Watt 10% QRD-14TRK122
R 7 Carbon Resistor 270 Q 1/4 Watt 10% QRD-14TRK271
R 8 Carbon Resistor 33K Q 1/4 Watt 10% QRD-14TRK333
R 9 Carbon Resistor 100KQ 1/4 Watt 10% QRD-14TRK104
R 10 Carbon Resistor 2.7KQ 1/4 Watt 10% QRD-14TRK272
R11 Carbon Resistor 2.2KQ 1/4 Watt 10% QRD-14TRK222
R12 Carbon Resistor 1.2KQ 1/4Watt 10% QRD-14TRK122
R 13 Carbon Resistor 33KQ 1/4 Watt 10% QRD-14TRK333
R 14 Carbon Resistor 560 Q 1/4 Watt 10% QRD-14TRK561
R15 Carbon Resistor 10KQ 1/4 Watt 10% QRD-14TRK103
R16 Carbon Resistor 820 Q 1/4 Watt 10% QRD-14TRK821
R 17 Carbon Resistor 330 Q 1/4 Watt 10% QRD-14TRK331
R18 Carbon Resistor 10 Q 1/4 Watt 10% QRD-14TRK100
R19 Carbon Resistor 270 Q 1/4 Watt 10% QRD-14TRK271
R 20 Carbon Resistor 1.5KQ, 1/4 Watt 10% QRD-14TRK152
R 21 Carbon Resistor 100 Q 1/4 Watt 10% QRD-14TRK101
R 22 Carbon Resistor 2.2Q 1/4 Watt 10% QRD-14TRK222
R 23 Carbon Resistor 47 Q, 1/4 Watt 10% QRD-14TRK470
R 24 Carbon Resistor 100KQ 1/4 Watt 10% QRD-14TRK104
R 25 Carbon Resistor 4.7 Q 1/4Watt 10% QRD-14TRK4R7
R 26 Carbon Resistor I10KQ 1/4 Watt 10% QRD-14TRK103
R 27 Carbon Resistor 47KQ 1/4 Watt 10% QRD-14TRK473
R 28 Carbon Resistor 25KQ 1/4Watt 5% QRD-14TRJ253
R 29 Carbon Resistor 270 Q 1/4 Watt 10% QRD-14TRK271
R 30 Carbon Resistor 10 Q 1/2 Watt 10% QRD-12TRK100
R 31 Carbon Resistor 560 Q 1/4 Watt 10% QRD-14TRK561
R 32 Carbon Resistor 270 QO 1/4 Watt 10% QRD-14TRK271
R 33 Carbon Resistor 100KQ 1/4 Watt 10% QRD-14TRK104
CAPACITORS
Cc 1 Electrolytic Capacitor 50 uF WV 10V QCE-A10V50
G2 Electrolytic Capacitor 1 uF WV 10V QCE-A10V1
Cc 3 Electrolytic Capacitor 30 uF WV 6V QCE-A6V30
C 4 Polystyrene Capacitor 0.1 “uF QCQ-K05104M
i. Polystyrene Capacitor 0.05 pF QCQ-K05503M
Se 56 Electrolytic Capacitor 30 uF WV 6V QCE-A6V30
Cay Electrolytic Capacitor 10 uF WV 10V QCE-A10V10
Cc 8 Electrolytic Capacitor 0.5 uF WV 10V QCE-A1OVOR5
Ee 9 Electrolytic Capacitor 50 wF WV 6V QCE-A6V50
C10 Electrolytic Capacitor 50 wF WV 10V QCE-A10V50
Et Electrolytic Capacitor 500 uF WV 12V QCE-A12V500
G12 Polystyrene Capacitor 0.01 yF QCQ-K05103M

Ref. No.
C13 Polystyrene Capacitor
C 14 Polystyrene Capacitor
Cs Electrolytic Capacitor
Ei6 Electrolytic Capacitor
E18 Polystyrene Capacitor
Clg Polystyrene Capacitor
C21 Polystyrene Capacitor
CF22) Electrolytic Capacitor
TRANSISTORS
Ref. No. Description Parts No.
Tr J Transistor 25B 173
Ge 22 Transistor 2SB: 175
in +3 Transistor 2SB 175
Tr 4 Transistor 2SB 178
Tir &5 Transistor 2SB 178
Tr 6 Transistor 2SB: 172
VARIABLE RESISTORS
VR 1 Variable Resistor 1OKQ QVVR-600A10KC
VR 2 Variable Resistor 10 KQ, QVVR-1606G10KC
DIODES
Di Silicon Diode FR-1A
De? Silicon Diode FR-1A
Des Diode OA-70
TRANSFORMERS
Hee eal Input Transformer QLA-0113
‘Nee Output Transformer QLA-0322
hes Oscillator Transformer QLB-0119
T 4 Power Transformer QLP-0365
SWITCHES
Ss 1 Record, Playback selector
Switch ESD-0162
Se a2 Power ON/OFF Switch QSB-0132
Sr53 Stop Switch QSB-0132
S 4 Relay QSK-0104
Se 75 Rewind Switch QSB-0141
S: 6 Rewind Switch QSB-0141
See Sound Monitor Switch
S: 38 Voltage Selector Switch QSS-1011
THERMISTORS
SM Thermistor TD6é-A050 QVM-500A
ELECTRICAL PARTS
Es Record/Playback Head WY-011
E, 22 Erase Head WY-209
Eno Speaker EAS-9P52S
E 4 Speaker Holder QKT-1154
Er es Base Plate Supporter QLT-1153
E 6 V.U. Meter QSL-0024
EZ. A. C. Power Cord
(with 2 Pin Plug) QFC-1021
Description
0.01 pF
0.001 pF
500 uF WV 12V
3 uF WV 12V
0.01 wF
3900 PF
820 PF
100 uF WY 10V
Ref. No.
E 8
9
10
11
12
13
m mmmm
m
14
15
16
17
18
19
mmimmim
Parts No.
QCQ-K05103M
QCQ-K05102M
QCE-A12V500
QCE-A12V3
QCQ-K05103M
QCQ-K05392M
QCQ-K05821M
QCE-A10V100
Description Parts No.
A. C. Power Cord Bushing QTD-1126
Insulating Paper QBK-1039
Circuit Board Assembly QEI-0083
Mic. & Remote Jack QJA-0214
M-3 Jack QJA-0110
R/P Selector Switch Spring
(long) QBT-1136
R/P Selector Switch Spring
(Short) QBT-1137
Lug A3 QMQ-1018
Screw, Round Head M2.6¢*3 QHM-226 x 5N3
Fuse QJF-1001
Fuse Holder QTF-1009
Voltage Selector Switch Angle QTT-1222
MECHANICAL PARTS
Reel Table Screw QHQ-1048
Reel Table Spring QBS-1016
Reel Table Washer QBJ-3025
Reel Table Assembly QXP-0117
Paper Washer 4X8 0.5 QBK-7048
ON A aARWDND —
DNNNND HS HSH emP HP eP nH HN GO" IND: 2 1" NO" (G0) SE OS iG: B.C)! IN! ==" (©) 80
23-1
24
25
26
26-1
27
28
BIBS eS Ss SS eS a SS SS,
Screw, Round Head M2¢x6
Screw, Round Head M2 ¢x 10
Flat Washer W2¢
Head Adjustment Spring
Screw, Round Head M3 ¢@x 5
Capstan Holding Screw
Capstan Sleeve
Paper Washer 580.25
Stop Ring E4¢
Flywheel Shaft Metal
Pinch Roller Spring
Plastle Washer 4X7 0.15
Oil Seal
Pinch Roller
Paper Washer 470.5
Stop Ring E3 ¢
Pinch Roller Rubber Bushing
Pad Arm
Pad Felt
Pad Arm Spring
Base Plate Rubber Bushing
Tape Counter
Tape Counter Pulley
Counter Spacer
Tape Counter Belt
QHM-120 6U3
QHM-120 < 10U3
QWP-2022U3
QBC-1026
QHM-230 & 5U3
QHQ-1032
QMS-1090
QBK-7053
QNS-404U3
QMN-1048
QMN-1050
QBJ-3009
QBJ-1059
QDP-1053
QBK-7045
QNS-304U3
QBG-1077
QAP-1084
QAP-1054
QAP-1056
QBG-1078
QDC-0010
QDP-1089
QTW-1028
QDB-0047

Ref. No.
SS ny ye
29
30
31
32
33
34
35
36
37
38
39
40
4]
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
ma
Description
Rubber Cushion for V.U. Meter
Screw, Round Head M3¢ «8
Cam
Lock washer L3 4
Fast Forward Roller Lever Spring
Fast Forward Roller
Pulley Lock Spring
Sub Fast Forward Lever Spring
Paper Washer 3.7 x7 0.25
Guide Pulley (L)
Guide Pulley (S)
Fast Forward Pulley
Friction Washer
Friction Pulley
Friction Spring
Plastic Washer 6% 80.15
Friction Pulley Nut
Paper Washer 580.25
Idler Pulley
Paper Washer 5.2>«8%0.5
Sub Takeup Belt
Takeup Belt
Supply Pulley Brake Arm
Sub Clutch Lever Spring
Supply Pulley Brake Arm Spring
Supply Pulley
Hexagonal Nut N3 ¢
Motor Assembly
Motor Spring
Flywheel
Flywheel Thrust Steel Ball
Screw, Round Head M3 ¢* 4
Flywheel Spacer
Thrust Steel Ball Retainer
Pinch Roller Lever Spring
Clutch Lever Spring
Rewind Lever
Plastic Washer 470.15
Rewind Pulley
Steel Washer 4120.3
Rewind Rubber Belt
Rewind Lever Spring
Motor Lifter
Cam Plate
Record Lock Spring
Catch Lever
Catch Lever Spring
Paper Washer 481.5
Fast Forward Lever
CABINET PARTS
QNQXNDOXOOXDOXOO
Top Cover Case Assembly
Top Cover Lock Button
Top Cover Lock Spring
Screw, Round Head M2 ¢@ 3
Head Cover
Main Case Assembly
Record Lock Button
Parts No.
QBG-1079
QHM-230 x 8U3
QMQ-1044
QWG-302K3
QBT-1130
QDP-1090
QBT-1132
QBT-1131
QBK-7036
QDP-1054
QDP-1051
QDP-1091
QW@Q-1045
QDP--1094
QBP-1029
QBJ-3006
QNQ-1020
QBK-7053
QDP-1092
QBK-7065
QDB-0048
QDB-0049
QXL-0064
QBT-1143
QBT-1133
QDP-1093
QNN-3022U3
QYQ-0032
QBT-1139
QXF-0025
QDK-1002
QHM-130 « 4U3
QNK-1063
QMQ-1035
QBT-1125
QBT-1064
QXL-0062
QBJ-3009
QDP-1052
QWQ-1051
QDB-0025
QBT-1072
QBK-1042
QMF-1051
QBT-1066-1
QXL-0024
QBT-1134
QBK-7052
QML-1205
QYA-0040
QGO-3008
QBP-1059
QHM-220 * 3U3
QYR-0049
QYB-0085
QGO-1025
Ref. No. Description
G 3-2 Record Lock Spring
G 3-3 Record Lock Lever
G 3-4 Belt Catch
G 3-5 Plastic Washer 4.2 8.50.2
G 3-6 Lock Washer L4¢
G 3-7 Hexagonal Nut N4¢
G 3-8 Screw, Round Head MS3¢ x 10
G 3-9 Side Panel
G 3-10 Hexagonal Nut N3 ¢
G 3-11 Capstan Rest
G 3-12 Head Cover Pin
G 3-13 Hexagonal Nut N2.6 @
G 3-14 Pole
G 4 Bottom Cover Case Assembly
G 4-1 Battery Pulling Belt
G 4-2 Flat Washer W3¢
G 4-3 Tapping Screw M3¢x6
G $ Battery Compartment Cover
Assembly
G 6 A.C. Power Cord Compartment
Cover Assembly
Gow Hinge
G 8 Screw, Round Head 12.6 6x10
G 9 Rubber Washer
G 10 Base Plate Holding Screw (long)
G 11 Base Plate Holding Screw (short)
G 12 Base Plate Pole (long)
G 13 Base Plate Pole (Short)
G14 Flat Washer W3.5 @
G 15 Paper Washer 3.1 x 9.1 x 0.5
G 16 Screw, Round Head M3 ¢x 5
G 17 Knob Holding Screw
G 18 Lock Washer L4@
G19 Operator Knob
G 20 Fast Forward Button
G*2] Volume Control Knob
G 22 Tone Control Knob
G 23 Jack Conceal Plate
ACCESSORIES
Al Dynamic Microphone
A 2 Accessory Bag
A 3 Magnetic Earphone
A 4 2 Pin Plug B
AS Connection Cord-R
A 6 Hand Belt
A 7 5” Recording Tape
A 8 5” Empty Reel
A 9 Splicing Tape
A 10 Instruction Book
PACKING
Pe Packing Case
Py 2 Inner Cushion (L)
B33 Inner Cushion (R)
P 4 Dust Cover
RPS) Accessory Case
7 =
Parts No.
QBC-1042
QML-1219
QHQ-1049
QBJ-3022
QWG-402K3
QNN-4022U3
QHV-230 x 10V3
QYP-0056
QNN-3022U3
QMP-1036
QMN-1090
QNN-2622U3
QMP-1078
QYC-0046
QFQ-1005
QWP-302N3
QHM-530 x 6U3
QEO-0006
QYF-0023
QKC-1013
QHT-226 « 10V3
QBG-1076
QHQ-1054
QHQ-1052
QHQ-1050
QH@-1051
QWP-3512N1
QBK-7039
QHM-230 x 5U3
QHQ-1055
QWG-352K3
QGT-2025
QGO-1024
QGT-1046
QGT-1047
QGIJ-1053
WM-2050N
QFK-0010
QJP-0910
QEB-0017
QKH-1026
QFT-5NZ-1
QFR-5NZ-1
QFS-0002-1
QQT-0178
QPN-1279
QBJ-1126
QBJ-1127
QFD-0056
QPW-1046

CABINET PARTS
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