Jvc QLY 55 F Service Manual

Page 2

Contents

1. Specifications ........................ 1
2. Service Precautions ..................... 2
3. How to Clean and Repair the Cabinet ......... 2
4. Names of Parts and Their Functions .......... 3
5. Technical Explanation ................... 4
6. Block Diagram ........................ 5
7. Adjustment Procedures .................. 6
7-(1) Overhang adiu stment ............... 6
7-(2) Tonearm height adjustment .......... 6
7-(3) Lead-in adjustment ................ 6
7-(4) Stylus height adjustment ............ 6
7-(5) Tracking force adjustment I .......... 7
7-(6) Motor phase adjustment ............. 7
7-(7) Lead-out adjustment ............... 8
7-(8) Horizontal drive stage offset adjustment . . 8
7-(9) Horizontal first stage offset adjustment . . . 8
7-(10) Vertical offset adjustment ........... 8
7-(11) Anti-skating adjustment ............. 8
7-(12) Tracking force adjustment ll .......... 8
7-(13) Adjustment locations . . s ........... 8
8. Removal Procedures .................... 9
8-(1) Removal of vertical coil ............. 9
8-(2) Removal of tonearm section .......... 9
8-(3) Removal of V.D. generator ........... 9
8-(4) Removal of horizontal coil P.C. board . . . . 10
8-(5) Removal of lamp house assy ......... 10
8-(6) Removal of control panel section ....... 10
8-(7) Removal of LEDs on control
panel section .................... 10

1 . Specifications

MOTOR SECTION
Motor

Drive system
Speeds
Wow and flutter

Signal-to-noise ratio
Speed detection
Starting torque

Speed deviation

Load characteristics
Platter

TONEARM SECTION
Type

Effective length

Overhang

Height range

Adaptable cartridge weight
range

CARTRIDGE SECTION

: Coreless, DC type, Ouartz~locked FG

servomotor

: Direct drive
: 33-1/3, 45 rpm
: 0.015 % (WRMS)

0.009 % (RMS, rotating section by F6
method)

: More than 78 dB (DIN-B)

: Frequency generator

: 1.5 kg'cm

: Within 0.002 %

: 0 % (with 210 9 total tracking force)

: 30.8 cm

: Dynamically-balanced electronic servo-

controlled tonearm

:254mm
:15mm

48 - 54 mm (preset to 51 mm)

3.5 - 16.5 9 (straight arm)
7.5 -- 20 g (S-shaped arm)
16 - 32 g (S-shaped arm, using
main weight "SW-Y55")
*Including headshell weight

(Except for U.S.A., Canada and U.K.)

Model

Type

Frequency response
Output

Channel separation

OL-YSSF
No. 2633

. MC-200E

: Moving coil (MC)

: 10 Hz - 25,000 Hz

: 2.3 mV (1,000 Hz)

1 25 dB (1.000 H2) (Test record TBS-1)

9. Troubleshooting Charts .................. 11
9-(1) Motor does not stop rotating ......... 11
9-(2) Turntable does not rotate ............ 12
943) Turntable rotates at high speed ........ 13
9-(4) Q damping is ineffective ............. 14
9-(5) Tonearm operation is abnormal ........ 15

10. Connection Diagram .................... 20
10-(1) Generalized unit .................. 20
10-(2) Vertical drive generator unit .......... 21
10-(3) Tonearm unit .................... 21

11. How to Handle the Solderless Connector ....... 21

12. Exploded View and Part Numbers ........... 22
12) Cabinet Ass'y .................... 22
12-(2) Control Panel Ass'y ................ 23
12(3) Tonearm Assy ................... 24

13. Printed Circuit Board Ass'y and Parts List ...... 25
13-(1) TAS-45Cl Main P.C. Board Assy ....... 25
13-(2) TXX-393B VR & Switch

P.C. Board Assy .................. 28
13-(3) LED P.C. Board Ass'y .............. 29
13-(4) Switch P.C. Board Ass'y ............. 29

14. Power Cord Connections in Different Areas ..... 29

15. Packing Materials and Part Numbers .......... 30

16. Accessories List ....................... 30

17. OL-Y55F Schematic Diagram .............. 31

18. Parts List with Specified Numbers for
Designated Areas ...................... 32

19. Power Specifications .................... 32

Load resistance : 47 kohms

Compliance : 8 x 10 cm/dyne (Dynamicl

24 x 10> cm/dyne (Static)

Stylus tip : 0.3 x 0.7 mil diamond

Stylus : DT-200E

Optimum tracking force : 1.75 g 10.25 9

GENERAL

Power source : See page 32.

Power consumption : See page 32.

Dimensions : 19.5(H) x 49.5(W) x 40.5(D) cm

(Since the dimensions show only the
design measurements, consideration is
required when installing the unit in a
limited space such as a rack, etc.)

Weight : 12 kg (26.5 lbs) (withoug packing
carton)
Accessories
EP adaptor ........................... 1
S-shaped arm pipe ...................... 1
Sub-weight .......................... 1
Hexagonal screwdriver ..................... 1

Design and specifications subject to change without notice.

Page 7

7. Adjustment Procedures

7-( 1) Overhang adjustment

Position the cartridge so that the distance between the
headshell end face and the stylus tip is 47 :1 mm as shown.
Confirm that the longitudinal axis of the cartridge is aligned
with that of the headshell.

7-(2) Tonearm height adjustment

1. With the arm clamped to the rest, loosen the tonearm
height adjustment screws with an accessory hex wrench
as shown. Then, adjust the arm height by moving the
arm up and down so that the stylus tip is about 25 mm
up from the control panel.

After adjustment, securely tighten the adjustment screws.

2. Release the arm from clamping and slightly lift it up
until it stops, then confirm that the stulys tip is about
7 - 9 mm above the platter mat.

7-(3) Lead-in adjustment

Be sure to perform this adjustment prior to the lead-out
adjustment.

Set the SIZE button to 17", then adjust by the lead-in
adjustment screw so that the lead-in count on the test

record (HG-325) is 16:3.
Note: When the lead-in count is more than the above

value, turn the adjustment screw counterclockwise,
while when it is less, turn the screw clockwise.

Since the adjustment screw is not provided with the
stopper, be careful not to turn it excessively, be-
cause this causes the directionality of the screw to
be reversed.

7-(4) Stylus height adjustment

Perform this adjustment after completion of tonearm

height adjustment.

1. Turn the READY switch ON, then lift up the arm by the
UP/DOWN button.

2. Turning the adjustment screw clockwise causes the
stylus to rise, while turning counterclockwise causes it
to lower. The height from the stylus tip to the record
surface is appropriate at about 6 mm.

Stylus tip
Headshell
Lie
1
4,7 Dm ..
Fig. 4 - N

Accessory hex wrench

Tonearm height 77"*-\
adjustment screws

Fig. 6 The lead-in adjustment screw
is located in this hole.

\° it
Q
. /
,, e: ©
Stylus height '. " ém. --~-
adjustment © , _/
screw
Fig. 7
QL-Y55F
No.2633