Jvc JL A40 Service Manual

Page 2

JL-A40 |

Features

Cueing facility protects the record surface during manual
playing.

Automatic reject facility

To stop playing a record at any point, push the
STARTIREJECT operation lever towards REJECT,
and the tonearm will automatically return to the arm
rest.

New gimbal support arm

Outstanding tonearm sensitivity is assured, because bearings
for clockwise/counterclockwise rotation are provided above
and under the pivot bearing. Trackability is, thanks to the
TH [Tracing Hold) tonearm system - the axis of the
balance weight is positioned below its fulcrum - superb.
and tracking characteristics are maintained even if a record
is warped or if there is external vibration.

Contents

Direct drive

A newly developed 12-pole DC servomotor provides greatly
improved performance. Highly accurate speed control and
freedom from vibration are the performance features
available only in the direct drive system.

Large high-inertia platter

Aluminium diecast platter having a diameter of 31cm and
weighting 1.6kg is employed. The stroboscope on the platter
rim (33-1/3 rpm.) permits fine speed adiustrnent while a
record is being played.

Diamond stylus
Good sound quality and long life are ensured by the
diamond stylus having a tip radius of 0.5 mil.

Anti-skating mechanism
Anti-skating force can be adjusted corresponding to the
tracking force.

P39
1. Specifications .......................................... 3
2. Block Diwam .......................................... 4
3. Operation
3-(1) Construction Diagram .................................. 5
3-(2) Return Cycle Mechanism ................................. 5
3(3) Reject Mechanism .................................... 6
4. Adjustment Procedure
Lead-out Adjustment ...................................... 6
5. Removal of Chassis Base Ass'y .................................. 7
6. Replacement of Parts
64 1) Cartridge ......................................... 7
6-(2) Chassis Mechanism .................................... 7
643) Voltage Setting (for US. Military Market and Other Countries) ............. 7
7. Troubleshooting
H 1) Tdale of Troubleshooting ................................. 8
7-l2) Chart 1 "Platter Does not rotate" ............................ 9
743) Chart 2 "Pinter rotates at a high mood" ......................... 1O
7-) Chart 3 "Emtic platter rotation" ............................ 10
745) Chart 4 Weak starting torque and long rise time" .................... 10
8. Exploded View: and Ports List
841) Toneorm Ass'y ...................................... 11
842) Player Ass'y ....................................... 12
8-(3) Mechanism Ass'y ..................................... 14
844) Parts List with Specified Numbors for Designated Areas ................. 16
9. Printed Circuit Board Ass'y and Pats List
9-) TPS-SB Power Supply P.C. Board Ass'y ......................... 16
942) MOO-933A Servo Control P.C. Board Ass'y ....................... 18
10. Packing Materials and Part Numbers ................. J ............. 20
11. JL-A40 Schematic Diagram .................... . ............... 21
12. Schematic Diagram for Designated Areas ............................. 22
13. Accessories List ......................................... 23

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