Jvc QLY 5 F Service Manual

Page 2

Contents

1. Specifications ......................... 1
2. Service Precautions ...................... 2
3. Names and Their Functions ................ 2
4. New Technology
4-(1) Electra-dynamic Servo Control Tonearm . . 3
4-(2) "O" Damping in Electra-dynamic
Servo Control ..................... 3
4-(3) Detecting Record-end ................ 4
4-(4) Applied Tracking Force by
Electro~dynamic Servo Control .......... 4
4-(5) Anti-skating Control ................. 4
4-(6) Cueing Control ..................... 4
4-(7) Lead-in Positioning .................. 4
5. Adjustment Procedures
5-(1) Tonearm Height .................... 4
5-(2) Cueing (Up/Down) Height ............. 4
5-(3) Tracking Force ..................... 5
5-(4) O" Damping ..................... 5
5-(5) Lead-in .......................... 5
5(6) Lead-out ......................... 5
5(7) Motor's Rotation ................... 5
5-(8) Tonearm Off-set Position .............. 5
6. Troubleshooting Charts
6-(1) Turntable does not rotate .............. 6
6-(2) Turntable rotates at high speed .......... 7

1 . Specifications

MOTOR SECTION
Motor

Drive system
Speeds
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 length
Overhang
Weight range

Variable tonearm height
range

: Coreless, DC type, FG servo-

moto I'

2 Direct drive
: 33-1/3, 45 rpm
: 0.025 % (WRMS)

0.011 % (by K 8: K measuring
method),

: More than 78 dB (DIN-B)

: Frequency generator

: 1 kg-cm

: Within 0.002 %

: 0 % (with 130 9 total tracking

force)

:0.0001%/H
:0%(110V)

: 0.00005 %/°c
: 31 cm

: Dynamically-balanced

electronic servo controlled arm

: 245 mm
: 15 mm
: 14.5 - 24 9 (including

headshell weight)

: 42 - 48 mm (preset to 45 mm)

6-(3) No tracking force on play .............. 7
6-(4) Tonearm does not move to right direction . . . 8
6- (5) Tonearm does not move to left direction . . . . 8
6- (6) Tonearm does not return automatically . . . 9
6- (7) No "Q" damping effects .............. 10
6- (8) Cueing does not operate upwards ......... 10
6-(9) No anti-skating effects ................ 11
6-(10) Lead-in is not performed .............. 12
6-(11)On the tonearm Up Sensor ............. 13
7. Connections Diagram .................... 14
8. Exploded Views and Parts List
8-(1) Platter and Cabinet .................. 15
8-(2) Front Panel Ass'y ................... 16
8-(3) Tonearm Ass'y ..................... 17
9. TXX-270 Printed Circuit Board Ass'y
and Parts List .................. 18
10. Packing Materials and Part Numbers ........... 21
11. OL-Y5F Schematic Diagram ................ 22
12. Accessories List ........................ 24
13. Parts List with Specified Numbers for
Designated Areas ....................... 24
Power Specifications ..................... 24

Warning:

When replacing the parts marked with A, ,be sure to use
the designated parts to ensure safety.

CARTRIDGE SECTION

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

Model

Type

Frequency response
Output

Channel separation

Load resistance
Complia nce

Stylus tip

Stylus

Optimum tracking force
GENERAL

Power source

Power consumption
Dimensions

Weight

Accessory

. MD-1025EB

: Moving Magnet (MM)

: 10 Hz - 25,000 Hz

:3 mV (1,000 Hz)

: 25 dB (1,000 Hz) (test record

TBS-1)

:47 k9 - 100 kg
: 10 x 106 cm/dyne (Dynamic)

30 x 10'6cm/dyne (Static)

: 0.3 x 0.7 mil diamond
: DT-ZiEB
: 1.75 £0.25 9

: Refer to Table at page 24
: Refer to Table at page 24
:16.9(H) x 48(W) x 43(D) cm

(6-5/8" x 145/16" x 1-3/4")
(Since the dimensions show only
the design measurements,
consideration is required when
installing the unit in a limited
space such as a rack, etc.)

: 10.5 kg (23.1 lbs)

(without corrugated card board
case)

: EP adaptor ........ 1

Design and specifications subject to change without notice.

either direction.

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 c0rresp0nds with the line voltage in your area. If it
doesnt, be sure to adjust the voltage selector switch to the proper setting before Operating this equipment. The voltage
selector switch is located either on the set's or the chassis. Simply insert a screw driver into the voltage selector switch and
turn it in either direction while pressing slightly and in such a way that desired voltage marked on the switch is positioned
at the arrow marked on the rear panel or the chassis. The voltage selector switch accommodates up to three turns in

OL-Y5F
No. 2522

Page 10

6-(4) Tonearm does not move to right direction

{The tonearm does not travel to the right Di.)

Refer

page 10.

Are the output
A, B, C, and Din
the Microcomputer
IC808 as shown
below?

Does about
+12 V appear at Pin 1
of IC805?

to NOTE" on

+12 V appear at the

Replace 523340-003
tonearm assy.

Does about Yes

emitter of X803?
nected.

The connector for
the tonearm coil
and the tonearm
coil are discon-

6-(5) Tonearm does not move of left direction

-{ The tonearm does not travel to the left (<). |

Refer
to "NOTE "
page 10.

Are the

outputs A, B, C. and Does about
D in the Microcomputer -12 V appear at Pin 1
IC808 as shown of IC805?
above?

|0808 is defective. "38073" 3805 '3 X804 is defective.
. defective. .
Replace it. Replace it. Replace it.

IC808 Right Left UP
A Pin 10 0 V 0 V 0 V
8 Pin 11 5 V 5 V 5 V
C Pin 12 0 V 5 V 5 V
D Pin 13 5 V 0 V 5 V

on

tonearm ass'y.

Replace E23340~003

Does about
-12 V appear at
.the emitter of
X803?

Yes

nected.

The connector for
the tonearm coil
and the tonearm
coil are discon-

l0805 or IC807 is
defective.
Replace it.

ICBOB is defective.
Replace it.

X803 is defective.
Replace it.

OL-Y5F
No. 2522