JVC OL-A200 User manual

MODEL
OL-A200
QUARTZ LOCKED
AUTO-RETURN
TURNTABLE
No 2649
January 1 982

Service Precaution
1.
QL-A200
The design of this product contains special hardware,
many circuits and componets specially for safety pur-
poses.
For continued protection, no changes should be made to
the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Service should be per-
formed by qualified personnel only.
. Alterations of the design or circuitry of the product
should not be made. Any design alterations or additions
will void the manufacturer’s warranty and will further
relieve the manufacturer of responsibility for personal in-
jury or property damage resulting therefrom.
. Many electrical and mechanical parts in the product
have special safety-related characteristics. These
characteristics are often not evident from visual inspec-
tion nor can the protection afforded by them necessarily
be obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in
the parts list of Service manual. Electrical components
having such features are identified by shading on the
schematics and by ( A\ ) on the parts list in Service
manual. The use of a substitute replacement which does
not have the same safety characteristics as the recom-
mended replacement part shown in the parts list in Ser-
vice manual may create shock, fire, or other hazards.
. The leads in the products are routed and dressed with
ties, clamps, tubings, barriers and/or the like to be
separated from live parts, high temperature parts, mov-
ing parts and/or sharp edges for the prevention of elec-
tric shock and fire hazard.
When service is required, the original lead routing and
dress should be observed, and they should be confirmed
to be returned to normal, after re-assembling.
No. 2649
5. Leakage current check
(Safety for electrical shock hazard)
After re-assembling the product, always perform an
isolation check on the exposed metal parts of the
Products (antenna terminals, knobs, metal cabinet,
screw heads, earphone jack, control shafts, etc.) to be
sure the product is safe to operate without danger of
electrical shock.
Do not use a line isolation transformer during this check.
@ Plug the AC line cord directly into the AC outlet.
Using a ‘‘Leakage Current Tester’’, measure the
leakage current from each exposed metal part of the
cabinet, particularly any exposed metal part having a
return path to the chassis, to a known good earth
ground (water pipe, etc.). Any leakage current must
not exceed 0.5 mA AC (r.m,s.).
@ Alternate check method
Plug the AC line cord directly into the AC outlet. Use
an AC voltmeter having 1,000 ohms per volt or more
sensitivity in the following manner. Connect a
1500 Q 10 W resistor paralleled by a 0.15 nF AC-
type capacitor between an exposed metal part and a
known good earth ground (water pipe, etc.).
Measure the AC voltage across the resistor with the
AC voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a
return path to the chassis, and measure the AC
voltage across the resistor. Now, reverse the plug in
the AC outlet and repeat each measurement. Any
voltage measured must not exceed 0.75 V AC
(r.m.s.). This corresponds to 0.5 mA AC (r.m.s.).
AC VOLTMETER
(Having 1000 ohms /volt,
or more sensitivity.)
ain
| O.15pF AC TYPE
Pee
Place this probe
on each exposed
metal part.
1500n 10W
Good Earth Ground

Contents
Page
1. Specifications ............c.ecececececesonessnnennarcecessenens 2
2. Mechanism Operation .................0::sseeeeeeeeeeeeeeees 3
2-(1) Change Cycle Start Mechanism ...............+. 3
2-(2) Tonearm Operating Mechanism
and Switch ON-OFF Mechanism ................ 3
3. Removal and Reassembly Procedure .................++ 4
3-(1) Removal of Cabinet .................cc cece ee ee eee 4
3-(2) Reassembly of Cabinet ...................:.0.:eeee 4
3-(3) Removal of Pickup Base Ass’y .................55 4
3-(4) Reassembly of Pickup Base Ass’y .............. 4
3-(5) Reassembly of Anti-skating Lever .............. 5
4. Stylus Replacement (DT-5511) ............c:eseeeeeeeeees 5
5. Cartiridge Mounting ..............ccccssesserereceeeeeeeeeeres 5
5-(1) Removal and mounting of the headsheel ..... 5
5-(2) Mounting Cartridge ...........ccccceeereseeeseeeeees 5
GB. Adjustment ..........:cccceeceeseeecesseneersseeesetsenereneees 6
6-(1) Tracking Force Adjustment .............-.0.0.006 6
6-(2) Overhang Adjustment .............0cccscereeeeeeees 6
Page
6-(3) Tonearm Elevator-height Adjustment .......... 6
6-(4) Lead-out Adjustment ................cceeceeeeeeeeee 7
7. Exploded Views and Parts List ..............:::.eceeeeeee 8
7-(1) Mechanism Assembly .................0.00.cceeeeee 8
7-(2) Mechanism Base Assembly ....................0065 9
7-(3) Tonearm Assembly ................cc:eeeeeeene eens 10
8. Power Cord Connections in Different Areas .......... 10
9. Printed Circuit Board Ass’y and Parts List ............. 11
9-(1) TXX-437(1 Power Supply
P.C. Board ASS’y ............ ccc ce eee ne eee ee ener ee eees 11
9-(2) MC-945B Motor Driver P.C. Board Ass’y .... 11
10. Accessories List .............::ceceseeeeeee cece ereeeeeesenoees 12
11. Packing Materials and Part Numbers .................066 13
12. QL-A200 Schematic Diagram .................. cece eee 14
13. Trouble ShOOting ............ cece ee eeeeteeeeteteenereeeeat 16
14. Parts List with Specified Numbers for
Designated Area ................:.:eceeeeeeneeneees Back Cover
CHECKING YOUR LINE VOLTAGE (For U.S. Military Market and Other Countries)
Before inserting the power plug, please check this setting to see that it corresponds with the line voltage in
your area. If it doesn’t, be sure to adjust the voltage selector switch to the proper setting before operating this
equipment. The voltage selector switch is located undernearth the platter on the cabinet.
CAUTION Before selecting the ‘Voltage selector swtich’’ to proper voltage disconnect the power plug.
1. Specifications
MOTOR AND PLATTER
Drive system : Quartz locked auto-return turn-
table
Driver Motor : DC servomotor
Speeds : 33-1/3 and 45 rpm
Wow and Flutter : Less than 0.025% (WRMS)
0.045% (DIN)
Signal to Noise Ratio : Better than 78 dB (DIN-B)
Platter : 12-inch (30 cm) diameter die-
cast aluminium alloy
TONEARM
Type : Statically balnaced straight
tubular arm with JVC
developed TH (Tracing Hold)
balancing system and tracking
force dial graduated in
0.1 gram steps.
Effective Arm Length : 220mm
Overhang >15 mm
Applicable Tracking
Force Range : 0 to 3 grams
Applicable Cartridge : 9.0 to 12.5 grams (including
Weight headshell)
Headshell Weight : 4.5 grams
CARTRIDGE (Except the QL-A200 for U.S.A. and Canada)
Type : Moving magnet (MD1055T1)
Stylus : 0.6 mil. diamond for DT-551
Optimum Tracking
Force :1.75+0.25 grams
Output : 2.5 mV (1 kHz)
Frequency Response : 10 to 25,000 Hz
Separation : Better than 25 dB (1 kHz)
Load Resistance : 47 kohms
Compliance : 25x 10°8cm/dyne (Static)
8 x 10-®cm/dyne (100 Hz
Dynamic)
GENERAL
Dimensions : 43.5(W) x 36.0(D) x 19.5 (H) cm
Net Weight : 5.2 kg (11.5 lbs)
POWER SPECIFICATIONS
Povwwer
Countries Line Voltage & Frequency Corsurmption
U.S.A. & CANADA | AC 120 V, 60 Hz |
CONTINENTAL
EUROPE |
AC 220 Vn, 50 Hz
U.K. & AUSTRALIA} AC 240 V~, 50 Hz
AC 110/120/220/
Sow atts
erred 240 V~ selectable,
50/60 Hz
AC 110/120/220/
OTHER AREAS 240 V~ selectable,
50/60 Hz
Design and specifications subject to chang: vwithout
notice.
QL-A200
No. 2649

2. Mechanism Operation
2-(1) Change Cycle Start Mechanism
During play, the relationship between the main gear notch
and the platter spindle gear is as shown in Fig. 1. Since the
projection is apart from the engagement, the main gear is
stationary even when the platter is rotating. As play pro-
ceeds, the arm lever pushes the trip lever and this moves
the lower trip which, in turn, gradually drives out the
engagement mounted on the lower trip. The relationship
between the engagement and the projection at this time is
as shown in Fig. 2. When the pitch of the record groove is
small, the pitch of engagement advance is also small and
the engagement will be pushed by the projection. The main
gear, therefore, remains stationary.
At the end of play, when the tonearm comes to the lead-
out groove having a larger pitch, the engagement advances
more than the projection pushes it back and their relation-
ship is now as shown in Fig. 3. The projection pushes the
engagement, the main gear starts to turn, the main gear
notch moves and the platter spindle gear engages with the
main gear. Thus, the change cycle starts as the main gear
starts to turn.
When the main gear stops turning, the relationship shown
in Fig. 1 is restored and the main gear remains stationary
even when the platter spindle gear turns.
On the other hand, the driven out engagement and lower
trip are pushed back to their initial positions by the edge of
the platter spindle gear just before the main gear stops tur-
ning. The cam of the main gear pushes the trip lever back
to its initial position earlier than the engagement and lower
trip. The return position can be fine-adjusted to start earlier
or later by screwing the adjuster.
Projection
Lower Trip
©
a
Platter
Spindle
Gear
Engagement
Main Gear Notch
Fig.
1
Fig.
2
Fig.
3
Projection
Main
Gear
Arm Lever
Trip Lever
Lower Trip
2-(2)
Tonearm
Operating
Mechanism
and
Switch
ON-OFF
Mechanism
At the end of play, the main gear turns to move the drive
plate in direction ‘‘a’’. Thereby, the elevator cam turns in
direction ’’c"' by part of the case. The elevator is push-
ed up by the sloping part of the elevator cam to lift the
tonearm.
On the other hand, arm lever stud contacts the part
of the case and turns in direction ‘‘d’’ to return the
tonearm
to
the
rest.
Then,
the
drive
plate
moves
in
direc-
tion ‘'b’, and boss of the off lever is driven by part
of the drive plate with part of the switch lever
locked by the off lever. The microswitch is thereby turned
OFF and the series of operation ends.
QL-A200
No. 2649
Arm Lever Stud ®
Case
Drive Piate
Tonearm
Shaft
[i 7 NS
Switch Lever

3. Removal and Reassembly Procedure
3-(1) Removal of Cabinet
1. Remove feet a) - (4) shown in Fig. 6.
2. Remove the cord stopper (5) of the signal cord as
shown in Fig. 6.
3. Remove the head shell and main weight from the
tonearm.
4. Move the tonearm in direction of the center spindle as
shown in Fig. 7.
5. Lift the cabinet up, then remove the cabinet.
Note: When the cabinet touches the tonearm, this may
damage the tonearm and the cabinet.
3-(2) Reassembly of Cabinet
1. Set the ‘‘CUEING”’ switch to the ‘‘DOWN"” position.
2. Set the tonearm as in Fig. 7.
3. Reassemble the cabinet.
Note: When remouting the feet (a) - (4) , mount the feet
having slipproof at the front side.
Fig. 7
3-(3) Removal of Pickup Base Ass’y
1. Remove the anti-skating cover as shown in Fig. 8.
2. Remove screws - as shown in Fig. 9.
Fig. 8
ground
3-(4) Reassembly of Pickup Base Ass’y
1. Push the switch lever by top of the finger as shown in
Fig. 10, then mount the pickup base ass’y.
So that, the stad of the arm lever is located as shown in
Fig. 11.
Note : Check the ground as shown in Fig. 9 to keep
away from the arm lever.
Fig. 9
QL-A200
—~4— No. 2649

Anti-skating Lever
Switch lever
Arm lever Stud
Arm lever
Stud
Fig. 11
Fig. 10
3-(5) Reassembly of Anti-skating Lever
When mounting the anti-skating lever, set the anti-skating knob to ‘’O”’ position.
4. Stylus Replacement or-ss»
Replacement of the stylus can normally be done easily by if
removing the worn stylus from the cartridge body and
replacing it with a new stylus as shown in Fig. 12. «
Fig. 12
5. Cartridge Mounting
5-(1) Removal and mounting of the headsheel (Fig. 13)
Turn the connector screw in direction ‘‘A’’ to remove the
headshell from the tonearm. Fix it firmly when mounting
the headshell.
if Fig. 13
5-(2) Mounting Cartridge (Fig. 14)
1. Remove the 2 screws securing the cartridge to the
headshell.
2. Install the cartridge onto the headshell provided.
3. The four headsheil lead wires are colour-coded as
follows; connect them correctly :
White(+) ........ L Red(+) .......... R
Blue(—) .......... LE Green(—)....... RE
(Left) (Right)
4. Mount the cartridge onto the headshell correctly and
leave the screws slightly loose, then, after completing
the “overhang adjustment”’, tighten them firmly.
5. After cartridge replacement, be sure to perform the Soup
“'tracking force’’ and ‘‘anti-skating’’ adjustments.
Headshell
Washer
QL-A200 Fig. 14
No.
2649
SiR

6. Adjustment
6-(1) Tracking Force Adjustment
1. Remove the stylus cover.
2. Slide the anti-skating knob to align its index mark with
the “‘O’’ mark. (Fig. 15)
3. Slide the counterweight to the middle of the weight
shaft and turn until the tonearm is balanced with the
stylus nearly touching the record surface. (Fig. 19, 20)
4. Hold the counterweight at the adjusted position and turn
the tracking force dial until the ‘‘O’’ mark is aligned with
the index line on the tonearm weight shaft. (Fig. 16)
* It is most important to obtain the correct tracking
force.
5. Turn the counterweight in the direction O-1-2 until the
"4.75" (for the JVC MD1055II) mark on the tracing
force dial is aligned with the index line. (Fig. 17)
* Be careful not to touch the tracking force dial when
turning the counterweight.
* Turning the tracking force dial alone has no effect on
the tracking force.
6. Slide the anti-skating knob until the index mark of the
knob points to ‘’1.75'’ (JVC MD10551I) mark (Fig. 18)
Use the e marked scale when using a conical stylus.
Use the # marked scale for an elliptical stylus or a
record surface
record surface
6-(2) Overhang Adjustment (Fig. 21)
Adjust the overhang as shown, aligning the center lines of
the cartridge and the headshell. Leave 32 mm between the
stylus tip and the edge of the headshell as shown. An error
of +1 mm will not degrade performance.
6-(3) Tonearm Elevator-height Adjustment (Fig. 22)
The optimum clearance between the stylus tip and the plat-
ter mat is about 8 mm when the tonearm is resting on the
tonearm elevator (with the UP/DOWN knob switched to
the UP position). Turning the adjusting screw clockwise
lowers the height of the tonearm elevator and turning it
counterclockwise increases it.
QL-A200-:
No. 2649

6-(4) Lead-out Adjustment
If auto-return functions early or late adjust as shown in Fig.
23.
—When auto-return functions too late, turn the screw
counterclockwise with a screwdriver.
—When auto-return functions too early, turn the screw
clockwise.
When using test record, confirm the autoreturn functions
as follows.
Fig. 23
Test record Auto-return function
RG652 To be returned
RG653 Not to be returned
QL-A200
No. 2649

7. Exploded Views and Parts List
7-(1) Mechanism Assembly
QL-A200
igo No. 2649

Parts List
Cot £69971-001
aa Part Number | Description Q'ty Part Number Description Q'ty
1 | E10823-001 Dust Cover Ass’y See page 10 Tonearm Ass’y 1
2 | £70081-001 Hinge Ass’y E302608-001 Cover 1
3 | See back cover Turntable Covering See below Mechanism Ass’y 1
4 | E24335-001 Turntable E69854-004 Insulator 4
5 | E70082-001 Sheet E69855-004 Spring 4
6 | See back cover Cabinet E70042-001 Foot Ass’y (for Front) 2
7 | E302591-001 Slide Knob (for CUEING) E70071-001 Knob (for STOP) 1
8
|
E70070-001
Knob
(for
speed)
E61194-007
Spring
1
9 | E24352-002 Ornament E302599-001 Stop Lever 1
10
|
E69212-001
Mark
See
back
cover
Voltage
Selector
AV
1
11
|
See
back
cover
Power
Transformer
A\
if
Fuse
A
1
12
|
See
back
cover
Power
Cord
A
M
Safety
Case
A
1
13
|
QHS3876-162
Cord
Stopper
A
E70097-001
Slide
Lever
Ass'y
1
14
|
E69884-002
Cord
Holder
EWS013-153
Socket
Wire
1
15
|
MC954B
Motor
Ass’y
E10822-001
Bottom
Board
1
(aaa
16
|
E302594-001
Lever
GBSF3008Z
Tapping
Screw
4
17
|
See
back
cover
P.C.
Board
Ass’y
A
GBSF301
2Z
‘
2
18
|
E70079-001
Rod
Holder
GBSF3045Z
e
4
19
|
E70080-001
Spring
SBSF3008Z
m
19
20
|
E302598-001
Cueing
Lever
SBST3025Z
Screw
4
a |
22
|
E70101-001
Cueing
Rod
SBST3008Z
{oo
2
23
|
E70100-001
Stop
Rod
E70373-001
Foot
Ass’y
(for
Front)
2
QSM1V12-107
Micro
Switch
E70315-001
Knob
Sheet
2
QHS3876-252 Cord Stopper
ZA\ mark : Safety parts
7-(2) Mechanism Base Assembly
£69967-001 E65923-001 E70266-001
Trip Ass’y T. Screw Gear Stopper
E70038-001
E67694-004
Main Gear Assy . Spring
a ae IN Me LPSP3008Z
OY et Screw
fever
ie
a
E302553-001
GBSF3008Z
- Qs Case T. Screw
Ss haaay eS |
Engagement
Lot
Drive
Plate
Ass’y
£60912-001 £69957-001
Speed Nut Switch Lever
E69965-001 E302554-001
Cueing Lever
£69977-001
cS aN Elevator Cam
i a GBSF3008Z
es T. Screw
i £69964-001
Spring £67694-004 a
Spring nas IN : a << ;
ee
—
KI
La
beh
wa
Reject
Lever
a es Picea Sail E69972-001 ~GBSF3008Z
Qo. wo i we ! Slider T. Screw
= ' : 1 1
een. is | @
: a GO alc E67694-004
Tk ay Spring
NY E69961-001
£24316-001 0 OFF Lever
Barer Nt <6 | £67694-009
£70267-001 Spring
R. Tube
Fig. 25
QL-A200
No.
2649
ae