JVC QL-F6 User manual

JVC
MODEL
taL-Fe
QUARTZ FULLY AUTOMATIC
TURNTABLE
No. 2464
. FEB. 1979

Contents
Pages
1. Specifications ...................................................................
2. ServicePrecautions................................................................
Features.......................................................................
4. NamesofPartsandTheirFunctions.....................................................
5. Replacement Procedures
(1) Stylus..................................................................
(2) Headshell "
.....................................,...............
(3) Cartridge..............................................
..................
(4) Motor..................................................................
(5) HO/VODampingKnobs " '" 6
6. Lubrication
(1) HO/VODampingMechanism ..................................................
(2) Motor..................................................................
(3) FullyAutomaticMechanism...................................................
7. Adjustment Procedures
(1) ~UARTZ LOCK/PITCH CONTROL Meter ........................................
(2) OuartzLockAdjustment ..................................................... 8
Tonearm Section
(3) HeadsheliAngle "
.....
(4) TonearmElevator..........................................................
(5) Overhang ...............................................................
(6) Lead-in.................................................................
(7) Lead-out................................................................
(8) TrackingForce...........................................................
(9) Anti-skating.............................................................
(10) HO/VODamping .........................................................
8. OL-F6BlockDiagram .............................................................
9. Troubleshooting Charts
(1) Platter does not rotate.
.....................................................
(2) Platter rotates at high speed. .................................................
(3) Pitch Control operates abnormally. .............................................
10. Exploded Views and Parts List
10-(1) Cabinet & Mechanism Ass
y ..................................................
10-(2) Mechanism Ass
y .........................................................
10-(3) TonearmAss
y...........................................................
11. Printed Circuit Board Ass y and Parts List
11-(1) MDC-938G .............................................................
11-(2) TPS-206 ...............................................................
12. Accessories List .................................................................
13. OL-F6 Schematic Diagram ..........................................................
14. PackingMaterialsandPartNumbers....................................................
15. Parts List with Specified Numbers for Designated Areas. .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Back page
OL-
No. 2464 1 -

Specifications
MOTOR SECTION
(These specifications apply only to the quartz lock mode.
Motor : Core less, DC type
FG servomotor
: Phase-locking to the quartz
oscillator
: Direct drive
: 33-1/3
Servo system
Drive system
Speeds
Fine pitch
adjustable range
Wow and flutter
Signal-to-noise ratio
Speed detection
Starting torque
Speed deviation
Load characteristics
Drift
Power characteristics
Temperature
characteristics
Platter
TONEARM SECTION
Type
Effective arm length
Overhang
Weight range
including headshell
: :!: 6 % (at the pitch control mode)
: 0.025 % (WRMS)
: More than 78 dB (DIN-
: Frequency generator
: More than 1.2 kg-cm
: Within 0.002 %
: 0 % (with 170 g total tracking
force)
: 0.0001 %/H
: 0 % (:!: 10 V)
: 0.00005 %tc
: 32.7 cm
: Statically-balam;ed oil-damped
tonearm
: 233 mm
: 15 mm
: 13 - 20 g
24 g (when using the provided
sub-counterweight)
2. Service Precautions
. Be sure to use JVC standard parts.
. When repairing the speed control circuit board con-
nect the m938 G motor in order to prevent damage
to the transistor used.in the platter drive section.
. Be sure to adjust motor speed with the u nit level
otherwise fluctuations which make adjustment impos-
sible may occur.
. When repairing circuit board with the heat sink re-
moved, attach mobile heat-sink to prevent the tran-
sistor temperature from rising.
CARTRIDGE SECTION
(Except for USA, Canada and U.
Type : Moving magnet (MD-l025EB)
Frequency response : 10 Hz - 25 000 Hz
Output : 3 mV (1 kHz)
Channel separation : 25 dB (1 kHz)
(using the test record TRS-
: 47 - 100 k-ohms
: 10 x 10 6 cm/dyne (dynamic)
30 x 10 6 cm/dyne (static)
: DT-Zl EB , 0.3 x 0.7 mil.
(diamond, elliptical)
Optimum tracking force: 1.75 g :!: 0.25 g
GENERAL
Power consumption
Dimensions
Load resistance
Compliance
Stylus
Weight
Accessories
EP adapter
: 15W
: Height 14.2 cm (with closed
cover)
Width 45.6 cm
Depth 40.0 cm
(Since the dimensions show only
the design measurements, con-
sideration is requ ired when
installing the unit in a limited
space such as a rack, etc.
: 11 kg (without the packaging)
Sub-counterweight
: 1
Place the adapter on the center
spindle when playing a record
having a bigger diameter center
hole such as a doughnut record.
: 1
Design and specifications subject to change without notice.
3. Features
. Newly developed oil-damped tonearm assures high
trackability.
Highly sensitive, new gimbal'support tonearm system.
. Double-quartz servo circu it and high torque, non-
resonance coreless motor give high reliability.
. Extra-heavy aluminum diecast platter (2 kg including
the mat, inertia 330 kg/cm
Howling margin is greatly improved with the new
super-compound (type-l) board used as the base.
Operation buttons and controls are positioned at the
front for easy operation.
. NR-type headshell with minimum resonance is em-
ployed.
Moving-magnet cartridge with a elliptical stylus.
Fine pitch control allows adjustment within:!: 6 %
(approx. a half note).
. Quartz lock/Pitch control meter for convenient speed
check.
Fully automatic mechanism.
QL-
No. 2464

4. Names of Parts and Their Functions
Mat
Dust cover
Center spindle
Platter
Fig. 1
1. OIL DAMPED TONEARM
Ordinarily tonearms have a resonance frequency of
between 5 to 10Hz. If the peak of the range of a
tonearm is too high, accurate tracking of the tone-
arm with the record groove cannot be obtained be-
cause the tonearm resonates at a frequency generated
by ambient vibrations or sound pressure, or the tone-
arm can be influenced by adverse conditions of the
record such as warps, etc. The OIL DAMPED
TONEARM i~ designed to suppress the range of
resonance by maintaining a low resonant point of
the tonearm to prevent howling. With this OIL
DAMPED TONEARM , accurate tracking of the
record groove as well as a good resistant character-
istic to howling is possible, thus resulting in an im-
proveved SIN ratio. I n order to improve the sound
quality, the OIL DAMPED TONEARM plays an
important role.
QL-
No. 2464

2. HQ DAMPING knob
This controls the horizontal movement of the tone-
arm while aiding to keep the tonearm s resonating
point low. Set the knob to the same indication num-
ber as the optimum tracking force of this unit.
3. VQ DAMPING knob
This controls the vertical movement of the tonearm
while aiding to keep the tonearm s resonating point
low. Set the knob to the same indication number as
the optimum tracking force of this unit.
4. Speed select knob
Select a proper position of the speed select knob in
accordance with the rpm of the record.
33- 1/3 rpm record (LP)
.......... "
33"
45rpmrecord(EP)............. 45"
5. QUARTZ LOCK/PITCH CONTROL select button
QUARTZ LOCK:
Depress the button to the QUARTZ LOCK position
(~
) for playing a record at an accurate rotation
speed in the quartz lock mode. In this case, the
meter lights green.
PITCH CONTROL:
Depress the button a second time to obtain the
P ITCH CO NT RO L position (---) in order to per-
form fine pitch adjustment for the sound meeting
your preference. I n this case, the meter I ights orange.
6. PITCH CONTROL meter
When the QUARTZ LOCK/PITCH CONTROL
select button is set to the QUARTZ LOCK position
the meter is green-lit and the indicator displays "
When the QUARTZ LOCK/PITCH CONTROL
select button is set to the PITCH CONTROL posi-
tion, pitch control can be performed by turning
the PITCH CONTROL knob and the meter is
orange-I it.
#6 % means +6 %
b6 % means -6 %
7. PITCH CONTROL knob
Fine pitch control can be performed with the
QUARTZ LOCK/PITCH CONTROL select button
set to the PITCH CONTROL position. Pitch adjust-
ment range is :!: 6 %. The indicator in the meter
deflecting to the left (#) from the center (0) indi-
cates an increase to the accurate 33-1/3 or 45 rpm
and the deflection to the right (b) means a decrease.
8. ANTI-SKATING knob
This device cancels out the centripetal force that
pulls the tonearm to the center of the platter. This
prevents the stylus tip from skating toward the
center of the platter and at the same time eliminates
any excessive stylus tip force on the inner wall of
the record groove. Use the 8 marked dial when em-
ploying a spherical stylus. Use the marked dial
when employing an elliptical stylus or a SHIBATA
stylus.
Turn the dial to the same number as on the track ing
force dial.
9. REPEAT knob
Decide how many times you want to re-listen to the
record by using this knob. When you set the knob
to " , the record will continue to play repeatedly.
Note: This knob cannot be turned to indicate from
1 - 0 or 0 - 1 if the START button is de-
pressed with the power cord disconnected
from the outlet. For this, refer to the note
in the section "Necessary procedures prior
to record playing" on page 2.
10. START/REJECT buttons
When you start playing a record , depress the
ST ART button. The tonearm moves automatically
the position of the first groove of the record pre-
selected and gently lowers itself onto the surface of
the record to play it. When you stop playing the
record, depress the REJECT button. The tonearm
lifts, returns automatically to its rest and the platter
stops rotating.
, however, the REPEAT knob has been set for a
number of repeats, the tonearm performs the cor-
respond ing number of prepeats before the platter
stops rotating.
Note: When the dial of the repeat knob has been
set to numbers other than " , the platter
continues to rotate and the power will not
be turned off even though you depress the
REJECT button or even if the playing
record has finished. When you want the
power to be turned off after the record has
played once, be sure to set the repeat knob
to the "0" mark.
11. RECORD SIZE select knob
Set the knob to the corresponding position to the
size of the record before you play it.
30 cm diameter record. . . .
. . . . . . . . "
30" (12"
25 cm diameter record. . . .
. . . . . . . . "
25" (10"
17cmdiameterrecord...... "17"(7")
12. Arm lifter lever
This is used when you want to raise the tonearm
gently or gently lower it. When you push it to the
UP" position, the tonearm will be lifted up, and
when you pull it to the "DOWN" position, it will
be lowered down gently onto the record surface.
QL-
No. 2464

5. Replacement Procedures
5-( 1) Stylus
Stylus replacement (See Fig. 2)
Replacement of the stylus can be easily made by simply
inserting the stylus plug (A) into the jack (B) of the
cartridge. Service life of the stylus employed for this
unit (DT-Zl EB) is generally as follow; varying, depend-
ing on the record condition (dirty record groove etc.
Stereo LP record (30 cm) . . . Approx. 300 - 500 hours
Stylus are disposable items. Therefore, it is recommended
to buy a supply of styli when you buy the unit. When
purchasing them, specify the DT-Zl EB (JVC standard).
5-(2) Headshell
Removal and mounting of the headshell (See Fig. 3)
Turn the connector nut in the direction of "A" to remove
the headshell from the tonearm. Turn it in the direction
of "B" for mounting the headshell.
5-(3) Cartridge
Mounting the cartridge (See Fig. 4)
1. Remove the 2 screws securing the cartridge onto the
headshell.
2. I nstall your cartridge onto the headshell provided or
onto a headshell of your selection.
3. The headshell lead wires are color-coded as follows
connect them correctly.
White(+)
..........
L Red(+).......
BlueH " " LE Green(-
) ....,
4. Mount the cartridge properly onto the headshell
and leave the set screws slightly loosened, then, after
completing the "Overhang adjustment" (See page 9)
tighten them firmly. After this adjustment, be sure
that the conditions concerning the 3 adjustments on
page 5 and 6 are satisfactorily met.
5. After each cartridge replacement, be sure to perform
the 4 adjustments described on page 9.
(4) Motor
How to remove the motor (Fig. 5)
Remove the motor in the following sequence. There is
no need to remove the mechanism s base.
1. Remove the stopper, main gear and spring attached
to the motor plate.
2. Disconnect the plug connecting the motor with the
speed control circuit board.
3. Remove the 4 screws securing the motor.
4. Lift the trip lever as shown in the figure while taking
care not to deform it and remove the motor while
tilting it.
5. Mount the motor, in the reverse order.
QL-
No. 2464
Fig. 2
Fig. 3
, ~s~"'-
Cartridge
with stylus
Green: to RE or R- of cartridge
Blue: to LE or L- of cartridg
" ~
Red: to R+ or R of cartridge
White: to L+ or L of cartrige \
j ~
Headshell
~ #~"
lift "0"
Fig. 4
Fig.

(5) HQ/VQ Damping Knobs
When replacement of VQ or HQ damping knob becomes
necessary, do it in the following sequence.
. How to replace the HQ damping knob (Fig. 6)
1. Remove the 2 screws securing the HQ damping knob
and remove the knob.
2. Turn the HQ controller clockwise until it stops.
3. Clamp the tonearm to its rest.
4. Mount the new HQ damping knob on the HQ con-
troller with the indication "3" on the knob aligned
with the index line. Secure it with the 2 screws.
5. After replacing it, perform adjustment referring to
the section "How to use" on page 4.
. How to replace the VQ damping knob (Fig. 6)
Replace in the same way as the HQ damping knob is
replaced.
6. Lubrication
6-(1) HQ/VQ Damping Mechanism
QL-F6 turntables are completely adjusted at the factory
prior to shipment. The damping mechanism cannot be
repaired imd it is recommended that it be replaced if
it malfunctions.
7. Adjustment Procedures
Servo-motor Control Section
Ha damping knob
Ha controller
Index line
va controller
Fig. 6
Screws
"t.
va damping knob
6-(2) Motor
The motor needs no lubrication.
6-(3) Fully Automatic Mechanism
Apply high quality grease to connecting and sliding parts
after they are replaced.
7 -( 1) QUARTZ LOCK/ PITCH CONTROL Meter
How to use the QUARTZ LOCK/PITCH CONTROL
meter (See Fig. 7-
QUARTZ LOCK (~):
When the QUARTZ LOCK/PITCH CONTROL select
button (1) is depressed to tbe QUARTZ LOCK position
the meter (2) becomes green-lit. In this mode the rota-
tion speed is accurately controlled by phase-locking to
the quartz oscillator frequency. This means that correct
33-1/3 or 45 rpm is obtained. The indicator (2) of the
meter displays "
PITCH CONTROL
(---):
When performing fine pitch adjustment, depress the
QUARTZ LOCK/PITCH CONTROL select button (1)
to the PITCH CONTROL position and the meter be-
comes orange-lit. In this mode, fine pitch adjustment
can be performed by turning the PITCH CONTROL
knob (3) within a range of :!: 6 %. Turning the knob in
the (+) direction (counterclockwise) increases the rpm.
Turning it in the (-) direction (clockwise) decreases the
rpm. The meter indication of +6 % (#) shows the re-
produced sound raised by approximately a half tone.
Fig.
The -6 % (b) indication shows the reproduced sound
is lowered by approximately a half tone.
By making these adjustments, record sound reproduc-
tion meeting your preference can be obtained.
QL-
No. 2464

How to make adjustments if the pitch control meter
should indicate incorrectly (when the meter does not
display "0" in the QUARTZ LOCK operation). (See
Fig.
1. Disconnect the power cord from the outlet.
2. Remove the platter from the motor shaft.
3. Turning the "0" position adjusting screw clockwise
moves the indication to the right.
Turning this screw counterclockwise moves the indi-
cation to tl:1e-left.
Generally, there is no need for adjustment since
proper adjustment has been performed at the factory.
Should the indication of the meter be incorrect
adjust it in the manner above.
Adjustment of the FINE PITCH CONTROL
meter (See Fig. 7-
Perform this meter adjustment referring to the items
below after making mechanical adjustments pertaining
to rpm or repairing the meter circuits.
1. Function of the variable resistors used
1) VRl (4.7k.Q):
Connected in series with the meter and controls
the current flowing into the meter. Used to adjust
the full-scale deflection (:1: 6 %) of the meter.
2) VR2 (4.7k.Q).
Employed for adjusting the pointer of meter to
indicate the center position "0" at 33- 1/3 rpm
or 45 rpm.
3) VR4 (47 k.Q):
There is no need to adjust this variable resistor
because of the automatic adjusting system. How-
ever, adjustment in the following order is neces-
sary after the motor is replaced or the circuit is
repaired. Turning VR4 to the right (clockwise) as
seen from the circuit board decreases the speed
and turning it to the left (counterclockwise)
increases the speed and unlocks it. When it is
unlocked platter rotation becomes unstable.
Adjust VR4 to its middle position where the
rotation speed is stable and does not increase
or decrease.
4) VR5 (22 k.Q):
For adjusting the oscillation frequency of the
pitch control. Adjust V R5 (to near its middle
position) with the speed selector set to "33-1/3"
until the correct speed is obtained.
5) VR6 (10k.Q):
Pitch control located on front panel.
For detail, see PITCH CONTROL on page 6.
QL-
No. 2464
Fig.
2. Adjustmerrt method (See Fig. 7-C)
Perform mechanical adjustment for the meter to indicate
the center position before connecting to an AC outlet
for electrical adjustment.
1) Adjustment of the oscillation frequency of the non-
stable multivibrator
Connect a frequency counter to TP- l with the
QUARTZ LOCK/PITCH CONTROL select button
while set in the PITCH CONTROL position. Turn
VR5 with VR6 set to near the center position until
a frequency counter reading of 172.8 kHz obtained.
2) Center indication adjustment of the meter.
Turn VR2 with the speed select knob set to 33-1/3
until the meter indicates the center position "
Then, set the speed select to 45 rpm and the meter
indicates the center position "
Confirm again that the meter indicates center posi-
tion at the 33.1/3 rpm.
3) Full-scale deflection (:1: 6 %) adjustment
Turn VR6 until an oscillation frequency of 183.2 kHz
(+6 %) is obtained. Turn VRl until the meter correct-
ly indicates +6 %.
Turn VR6 until an oscillation frequency of 162.4 kHz
(-6 %) is obtained and confirm that the meter correct-
Iy indicates -6 %. Deflection of the meter out of the
-6 % zone is allowable. Turn VR 1 until the meter
indicates -6 %, if the meter deflection is insufficient
for -6 %. I n this condition, deflection of the meter
out of the +6 % zone may occur, but is allowable.
. The meter adjustment can be performed using a
stroboscope, even if measuring equipment is not
available. Turn VR5 with VR6 set to the center posi-
tion until the stroboscope appears stationary. For
the center indication adjustment, follow the same
manner as when employing a frequency counter.
It is not possible to perform the full scale deflection
adjustment and adjustment of VR 1 is unnecessary.
7 -

(2) Quartz Lock Adjustment
This adjustment is necessary only after replacing or re-
pairing VC4046 (IC1) or replacing VR4. Prepare a
voltmeter or tester having an impedance of more than
20 kD,/V . Connect it between Pin 10 and the ground
terminal of ICl and turn VR4 until a reading of 3
:1: 0.5 V is obtained.
Slight adjustment errors are negligible thanks to the
automatic lock-in type IC. The adjustment can be cor-
rectly performed with a tester having an impedance
1 k - 5 kSt if an impedance conversion is performed in
some manner, such as using an emitter-follower circuit.
Tonearm Section
7 -(3) Headshell Angle
Headshell mounting angle adjustment (See Fig. 8-
If the headshell is not horizontal and the stylus tip is not
perpendicular to the record surface, loosen the lock
screws as shown in the illustration and move the head-
shell to adjust the stylus to be at right angles (90 with
the platter. Eye-measurement is sufficient.
Be sure to retighten the screws after the adjustment is
completed.
7-(4) Tonearm 8evator
. Tonearm elevator height adjustment (See Fig. 9)
The optimum. clearance between the stylus tip and the
record surface is about 6 mm when the tonearm is sup-
ported by the tonearm elevator. Turning the adjusting
screws clockwise lowers the height of the tonearm
elevator and counterclockwise increases it.
Fig.
Fig.
Fig.
Fig. 9
QL-
No. 2464

7-(5) Overhang
. Overhang adjustment (See Fig. 10)
To obtain optimum overhang, when mounting the
cartridge, first align the cartridge s longitudinal axis to
that of the headshell and position the cartridge so that
the distance between the headshell's end face and the
stylus tip equals 48 mm.
Be sure to tighten the set screw after the adjustment.
Errors within 1 mm are negl igible from a practical
point of view.
7 -( 6) lead-
Stylus lead-in position adjustment (See Fig. 11)
Your QL-F6 was shipped from the JVC factory with its
stylus lead- in position adjustment made properly. How-
ever, if the stylus lead- in position is changed due to
cartridge changes, etc., adjust it as in the following:
1. Place a 30 cm record on the platter.
2. Set the record size select knob to "30" (12") and
operate the turntable in automatic play.
3. Confirm if the stylus lead- in position is about 3 to
4 mm inward from the outermost edge of the record
disc.
4. If the lead. in position is not in the proper range, turn
the adjustor screw with a screwdriver clockwise to
increase the distance between the lead-in position and
the outermost edge, and counterclockwise to decrease
the distance. Thus determ ine the proper lead- in posi-
tion point to be about 3 to 4 mm inward from the
disc edge.
7-(7) lead-out
Stylus lead-out adjustment (Fig. 12)
Be sure to perform this adjustment after replacing the
tonearm, motor or related mechanism.
1. Use a 17 cm (7") record (with a lead-out groove
diameter of about 110 mm).
2. Remove the platter from the motor shaft. Turn the
adjustor screw accessible through the hole shown in
the figure clockwise with a - screwdriver to increase
lead-out tuning.
3. Confirm the lead-out position with a 17 cm (7")
record with its inter-band track as near to the inner-
most groove as possible. If the lead-out position is
incorrect, re-adjust, it by turning the adjustment
screw.
QL-
No. 2464
Fig. 10
Fig. 11
Fig. 12

7-(8) Tracking Force
Fig. 13
Fig. 14
Fig. 15
Fig. 16
1. Tracking force adjustment
1. Turn the anti-skaing knob until
the "0" mark is aligned with the
index line. (See Fig. 13)
2. Turn the HQ damping knob until
the "0" mark is al igned with the
index line. (See Fig. 6)
3. Turn the VQ damping knob until
the "0" mark is aligned with the
index line. (See Fig. 14J
4. Place a disc on the platter.
5. Remove the stylus cover from the
stylus. (See Fig. 15)
6. Release the tonearm clamp. (See
Fig. 16)
7. Zero balance adjustment (See Fig.
17)
Turn the counterweight until the
tonearm is balanced. Stop turning
the counterweight when the stylus
tip is almost touching the disc
surface.
8. Return the tonearm to the rest
and clamp it.
9. Hold the counterweight at the
adjusted position and turn the
tracking force dial until the "
mark is aligned with the index
line on the tonearm weight
shaft. (See Fig. 19)
10. Turn the counterweight in the B
direction until the " 75" mark
on the dial is aligned with the
index line. The " 75" mark
means an optimum tracking force
of 1.75 g is being applied. (See
Fig. 20)
Note:
Turning the counterweight in the
direction A decreases the tracking
force and increase it in the direc-
tion B. Turning the dial only, has
no effect on the tracking force.
10 -
Fig. 17
Fig. 18
Fig. 19
Fig. 20
QL-
No. 2464

7-(9) Anti-skating
Anti-skaing adjustment
Adjust the anti-skaing force accord ing to the cartridge
being used. Turn the anti-skating knob dial to the same
number on the tracking force dial. Use the 8 marked dial
when employing a spherical stylus. Use the marked
dial for an elliptical or a Shibata stylus. Set the " 75"
of the - marked dial to the index line since the
QL-F6 is provided with an elliptical stylus and the track-
ing force has been adjusted to 1.75 g. (See Fig. 21)
7 -( 10) HO/VO Damping
Turn the HQ damping control and the VQ damping
control knobs until the " 75" marks on the dial are
aligned with the index line, since the optimum tracking
force for this unit is 1.75 g. When not using the oil-
damped function turn the knobs until the "0" mark is
aligned with the index line. (See Fig. 22)
Caution:Turning the HQ and VQ damping control knobs
while playing a record may cause damage to the
disc or to the stylus tip. Do not touch them
while playing a disc.
Release the tonearm clamp and start playing the record.
8. OL-F6 Block Diagram
Platter
AC Amp.
Schmitt circuit
F /V conversion
1----
-----
Push-pull
drive circuit
P/D circuit
DC amp.
Fig. 21
Fig. 22
Mono-multi
vibrator Meter drive
circuit
!+24V
=+=
+6% -
Power
supply
circuit
+24V
+ 8V
Oscillator/
Frequency
divider
L_-r- -
------
AC 100V
50/60Hz GND
Speed selection
Tal
5.5296MHz
QUARTZ LOCK/PITCH CONTROL selection
Non-stable
multivibrator
QL-
No. 2464 11 -
Pitch control Fig. 23

9. Troubleshooting Charts 9-( 1) Platter does not rotate
1. Turntable does not rotate.
Turntable does
not rotate when
start button is depressed.
Cooo,ct
Yes R,p""
Yes Replace the pilot
lamp.
Check the trans- former for dis- connected wires and damaged printed pattern.
Check X15, 02.
Yes -+/ X17 is defective.
12 -
X16 is defective.
Fig. 24
Yes Check all driving
coils.
Check transistors
X1 - X12, and Hall elements HG1 , HG2.
Note: Don t disconnect the motor from electronic
circuits while troubleshooting as transistors
in drive circuit may be damaged.
Yes IC5 is defective.
Replace.
Yes Is R70 discon-
nected or badly
soldered?
Yes
IC1 is defective.
Replace
Perform locking
adjustment or check the phase.
Yes
Check if C22
R68 are
open.
Observe the FG
output and IC4 performance to
trase the defect.
QL-
No. 2464

(2) Platter rotates at high speed.
Platter rotates at high speed.
Rotates at high speed
when the start button is depressed.
Does connecting the
base of X16 to +24 V
stop rotation?
When the terminals
of R30, R31 , R32 are
grounded , does rotation
stop?
X 16 is defective.
Replace.
QL-
No. 2464
Yes I s rectangular
waveform present at
Pin 7 of IC4?
Yes X17 is defective.
Replace.
Yes
Check the Schmitt cir- cuit and AC amplifier
sections, and the FG output of motor.
Fig. 25
Is the waveform
shown in the circuit
diagram present at
Pin 4 of IC1?
Yes
Check if C22, R6 , R68 are disconnected.
Replace if they are.
Yes
Check if IC1 is defec-
tive, R67 is disconnect-
, VR4 is open.
Replace if necessary.
Note: Don t disconnect the motor from electronic
circuits while troubleshooting as this may damage the transistors in the drive circuit.
13 -
IC5 is defective. Replace.

(3) Pitch Control operates abnormally.
Pitch control functions incorrectly.
Check for disconnected
wire(s) in the meter whether VR1 is open or
if the meter leads are
disconnected.
Check if R64 is dis-
connected and whether
X22 is open. Replace if necessary.
2. Meter deflects to positive side and remains there.
Collector and emitter
of X 18 are short-cir- cuited. Replace this
transistor.
Readjust and observe
14 -
Is D6 or D7 short-
circu ited? Replaced.
Yes
Disconnected or de-
fective R 11. Replace.
Yes Check if R52 is dis-
connected. Replace if defective.
Fig. 26
The collector and emit- ter of X 19 are short- circuited. Replace this transistor .
Readjust and observe. Check if R12 is dis-
connected. Replace if disconnected.
Check if R53 is dis-
connected. Replace if
so.
Yes
QL-
No. 2464

- 9L-
(j/;-
sSV ws!ue4:)all\l 18 :a.au!q~ (L)-
:a.S!l s:a.Jed pue SMa!J\ papoldx3 .0 L
179171::
9::1-

No. Parts Number Descrip~ion
See table below. Motor Board Ass
E65588-001 Lock Plate
E49447-004 Shaft
E66140-001 Rubber Sheet
E35480-002 Mark
E35869.o01 Fittings
G4942- Speed Nut
G4942-4
E22873-001 Panel
E22911.o01 Base
OSP221 0-059 Push Switch
E65912-001 Knob
OVD7A2B-014 V. Resistor
E61713-003 VR. Knob
35981-001 Meter Ass
Ol.P3201-1240 Lamp
E04353-001 Color Cap (Green)
E04353-002 (Blue)
LPSP3008ZS Ass y Screw
F2001 Mechanism Base Ass
SBSB3008Z Tapping Screw
SBSB2608Z
E65714-001 Knob
E65715-003 Lever Knob
See table below. Tonearm Ass
E60331-005 Screw
M938G Motor Ass
See table below. Servo Control P B. Ass
DPSP3008ZS Screw
E35915-002 Stopper
E65718-001 Spring
E22876-003 Main Gear Ass
E65282-001 Engagement Pawl
E65283-001 Lawer Trip Pawl
REE1200 E. Ring
E60912.o01 Speed Nut
E65719-001 Connect. Rod
See page 21 Fuse P B. Ass
E35838.o01 Push Knob Ass
E35839-001 Push Knob (START)
E35839.o01 (REJECT)
E65726-001 Pivot
REE3000 E. Ring
E65876-001 Leaf Spring
E65875-001 Rod Holder
Parts List with Specified Numbers for Designated Areas
No. Parts Number Description
E65729-001 Start Rod
E35841-001 Push Knob Ass
E65730-001 Bracket Ass
E35842-001 Push Knob (33 rpm)
E35842-002 (45 rpm)
E65733-0~H Pivot
REE2000 E. Ring
E65735-001 Reject Rod
E35844-001 Trans. Bracket
See table below. Shield Cover
See table below. Power Transformer
SBSB4008Z Tapping Screw
E49631.o03 Rubber Bushing
E49633-001 Motor Holder
See table below. Rubber Sheet
E50670.o05 Wire Clamp
E03724-002G Signal Cord Ass
OM LOO02-051 Lug Strip Ass
See table below. Power Cord Ass
See table below. Cord Bushing
E60090-003 Shield Cover
OSRO085-001 Voltage Selector (for U.
Mil itary Market and other
countries only)
E65329.o01 Holder
OSE2235-203BS Seesaw Switch
E66153-001 Weight
E61284-001 Tapping Screw
E35845.o01 Bottom Cover Ass
GBGB3012M Tapping Screw
See table below. Foot Ass
E65877-001 Latch
E65878-001 Pin
E22874.o01 Turntable
See table below. Turntable Sheet
E35828.o01 Dust Cover Ass
E10298-001 Dust Cover
E61992.o05 Hinge Ass
SDSP3010RS Screw
REE4000 E. Ring
REE3000
LPSP3008ZS Ass y Screw
E66154.o01 Rubber Sheet
E66089.o01 Caution Label
Item S. Military
No. Description Canada Europe Australia Market and
Other Countries
Motor Board Ass E 1
0302.004 E 1
0302.004 E 1
0302.004 E 10302-003 E 1
0302.004 E 1 0302-002
Tonearm Ass ARM-529 ARM-529 MP-201S ARM-529 MP-201S MP-201S
Servo Control
C. Board Ass MDC938G- MDC938G- MDC938G- MDC938G- MDC938G- MDC938G-
Fuse
C. Board Ass TPS-206B TPS-206C TPS-206E TPS-206GBS TPS-206F TPS-206D
C101 Capacitor &, OFH72BM-473M OFA72BM-473M OFZ9007-104 OFZ9007-104B~ OFZ1007-104 OFH53AM-104
Fuse (Primary) &, OMF61 U1-R50 OMF61U1-R50 OMF51A2-R20 OMF51A2-R20BS OMF51A2-R20 OMF60S1-R50
(0.5 A) (0.5 A) (0.2 AT) (0.2 AT) (0.2 AT) (0.5 A)
Fuse (Secondary) OMF61U1-1RO OMF61U1-1RO OMF51 A2-R80 OMF51A2-R80BS OMF51A2-R80 OMF60S1-R80
(1A) (1A) (0.8AT) (0.8AT) (0.8AT) (0.8A)
Fuse CliP&' E45524.o01 E45524.001 E48965-002 E48965-002 E48965.o02 E45524.o01
Shield Cover E65716.o01 E65716.o01 E65716.o01 E65716.o01
Power
Transformer &, E03032-33B E03032-33B E03032-33C E03032-33CBS E03032-33C E03032-33D
Rubber Sheet E61796.o03 E61796.o03 E61796.o03 E61796.o03
Power Cord&' OMP1200-200 aMP 1200-200 OMP3910-244 OMP9017.o07BS OMP2500-200 OMP1200-200
Cord Bushing OHS3876-162 OHS3876-162 A37897 A37897BS A37897 A37897
Foot Ass E65893.o02 E65893-002 E65893.o01 E65893-001 E65893.o01 E65893.o01
Turntable Sheet E22936.o02 E22936.o02 E22936.o01 E22936.o01 E22936.o01 E22936.o01
16 - QL-
No. 2464

10-(2) Mechanism Ass
C(ID
No. Parts Number Description
E22883-002 Base Ass
E60395-001 Reset Plate
E60394-003 Switch Plate Ass
E60392-O02 Switch Plate
E60393-002 Switch Lever
G4942- Speed Nut
E65740-O01 Spring
E35851-001 Dr. Gear Ass
E35850-O01 Driving Gear
E60398-O01 Lead-I n Lever
E65741-001 Push Lever
E60912-001 Speed Nut
E60399-001 Spring
E65742-O01
E60400-O02 Idler Gear
E60405-003 Sub Gear Ass
E60402-002 Sub Gear
E60403-O01 Hook
E60912-001 Speed Nut
E60404-001 Spring
E65744-O01 Ratchet Cam
E65745-001 Spring
E60912-001 Speed Nut
E65746-O01 Start Lever
E65747-001 Spring
QL-
No. 2464
No. Parts Number Description
E65748-001 Lock Lever
E60416-001 Spring
E35852-001 Index Lever
E60426-003 Lever
E60427-001 Spring
E65873-O01 Select Plate
E65749-O01 Select Lever
E60488-001 Spring
G41505-O05 Steel Ball
E60390-002 Elevator Cam
E 65874-00 1 Spring
REE3000X E. Ring
E65750-O01 Cueing Shaft
E49608-002 Spring
E60414-001 Rod
E65956-001 Cueing Ass
E65957-O01 Cueing Base
E65958-O01 Cueing Lever
E65959-001 Washer
E65960-O01 Spring
SBSB3010Z Tapping Screw
E65720-O01 Trip Lever Ass
E65959-002 Washer
E65959-O01
17 -

10-(3) Tonearm Ass'
102-16
( ~
102-II
'\
( "'-3
I \
~?!j
102-17
\ //- -
(j) I I 1 102-4
I / -
, \
102-12--j 'r ( 101-5 I I
Ei 101 1 I L ~102-5
/ '\ /"-
103 )i
/ y'.:'- ~ , ...
'r /
110 /J~ eY
~;;/ /
110-2 . .
/ . ' , / /
I~/
~02
- " , /~ /,/,~ \~ / ~~~/
~102
, , ~~.,/ ~) ;
102-3 \
~~IIO-'
: "
6!
?:\
110-3 Yi
/ (
i QI6U ~
. \
~I
,-
/105 I"~ \ C) "1 ~
, ~/~~
1\ ~1C \ "'102-191 1 ~1'l1",--i--102-6
~l
/ /
d:.~
" ~ '\ ~. !!!
~ i
~!Ye
III t!:r~ 0;& ~102-7
110-4 0 1)~
::::
\1 102-19 \ ~7 i-- 102-8
/ .
10213 ,!J 104
/ '~ ' '"
~1--!--102-9
112~ c.Jl~ 106 / 102-18 \ --1--102-10
113~1 106 102-15~"-..
/ \
, I!r
107 "
- /
102-14 '
No. Parts Number Description
101 E22901-001 Tonearm Ass
101- E35894-001 Cap (A)
101- TCS2002NS Screw
101-4 E35895-001 Cap (B)
101- TRS2006NS Screw
102 E22902-001 Tonearm Base Ass
102- E10308-O01 Tonearm Base Sub Ass
102- 35897-001 Plate
102-4 E35900-001 Anti-skating Knob
102- E49602-002 Wave Washer
102- E35901-001 Anti-skating Lever
102- E65825-001 Anti-skating Plate
102-8 E65827-001 Anti-skating Spring
102- 65826-001 Spring Holder
102- SBSB2608Z Tapping Screw
102- E65829-001 Elevator Ass
102- E49649-001 Spring
102- E61194-001
102- E49655-007 Elevator Shaft
102- REE3000 E" Ring
18 -
No. Parts Number Description
102- E65835-001 Screw
102- E65824-001 Rest Ass
102- SBSB2616Z Tapping Screw
102- SBSB2605Z
103 E65837-001 Washer
104 E65830-001 Nut
105 E300015-O01 Tonearm Lever
106 SPSP3006ZS Screw
107 E61775-O01 Shield Tube
108 E65823-001 Counterweight Ass
109 E65938-001 Subweight
110 E35991-002 Headshell Ass
110- E35989-002 Finger
110- E60501-005 Wire Ass
110-4 E60502-001 Screw
110- E22962-001 Headshell Boay .
111 MD-1025EB Cartridge
112 DT-Z1EB Stylus
113 E34268-001 Stylus Covering
QL-
No. 2464

11. Printed Circuit Board Ass y and Parts List
11-(1) MDC-938G
(Different in Different Area
see back page)
QL-
No. 2464 19 -