Jvc QLF 4 Service Manual

Page 2

OL~F4

Contents

1. Specifications
2. Service Precautions .......
3. Features
4. "How to Operate (Names and Functions) ................................ 3
5. Operation of Automatic Mechanism
5-(1) Construction Diagram ...................................... 4
5-(2) Start Mechanism .......................... 4
5-(3) Lead-in Mechanism ............ . 4
5-(4) Return Cycle Starting Mechanism . . 5
5-(5) Repeat Mechanism ............ . 6
5-l6) Reject Mechanism ........................................ 6
6. Block Diagrams
6-(1) Servomotor Control System .................................. 7
6-l2l ICSOZ Integrated Circuits and Waveforms ........................... 7
7. Troubleshooting
7-(1) Platter does not rotate .....................
7-(2) Platter rotates at high speed ..................
7-(3) Rotation is not locked to the crystal oscillator frequency . . . .
8. Removal of Chassis Base Assembly ................................... 1
9. Replacement Procedures
9-(1) Cartridge Replacement .................................... 10

9-(2) Mechanism Chassis Replacement
10. Adjustment Procedures

Servomotor Control Section

1041) Power Supply Voltage Check ................................. 11

10-(2) Lock Adjustment ...............

Tonearm Section

10-(3) Overhang Adjustment ..................................... 12

10-(4) Tonearm Elevator Height Adjustment .....

10-(5) Headshell Mounting Angle Adjustment .

10-l6) Tracking Force Adjustment .........

10-(7) Anti-skating Adjustment ..........

10-(8) Lead-in Adjustment .............

10-(9) Lead-out Adjustment
11. Lubrication .......................
12. Connection Diagram of TXX-124 ........................
13. Exploded Views and Pam List

13-(1) Cabinet and Mechanism Assembly .............................. 15

13-(2) Mechanism Base Assembly .................................. 17

13-(3) Tonearm Assembly ...................................... 19
14. TXX-124 Schematic Diagram .............
15. TXX-124 Printed Circuit Board Ass'y .........
16. Packing Materials and Parts Numbers ...........
17. 0L-F4 Schematic Diagram ................
18. Accessories List .....................
19. Parts List with Specified Numbers for Designated Areas ......................... 28

Wraning: When replacing the parts marked with & . be sure to use the designated parts to ensure safety.

CHECKING YOUR LINE VOLTAGE (For US. 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 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 sets on 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 the desired voltage marked on the switch is positioned underneath the
arrow marked on the rear panel or the chassis. The voltage selector switch accom-
modates up to three turns in either direction.

No. 2445

Page 20

QL-F4

13-(3) Tonearm Assembly

Tonearm Assembly Parts List

Item No. Fan: No. Parts Name Description O'tv
131 *See Page 28 Tonearm Assy Refer to Table 1 1
132 v Arm Assy Refer to Table 1 1
133 E35559-001 Counter Weight Ass'y 1
134 *E22733-001 Pick Up Base Assy 1
135 E22303-001 Pick Up Base Sub Assy 1
136 E35555-001 Anti-Skating Knob 1
137 E49602-002 Washer 1
138 E34258-001 Anti-Skating Cam 1
139 WSSZOOOZ Washer 1
140 835320052 Tapping Screw 1
141 E35028001 Plate 1
142 E60326-002 Arm Rest Assv 1
143 535326082 Tapping Screw 1
144 SSSP3016MS Screw 1
145 E60475-OO1 Elevator Assy 1
146 E49649-001 Spring 1
147 E61194-001 Spring 1
148 E49655-005 Elevator Shaft 1
149 REE3000 "E" Ring 1
150 65053 Nut 2
151 E34241J003 Arm Lever Assy 1
152 338330082 Tapping Screw 2
153 E34991-006 Headshell Ass'y 1
154 E34990-002 Headshell Body 1
155 E60501-001 Wire Ass'y 1
156 See Page 23 Screw Refer to Table 1 2
157 " Washer n 2
158 0 Nut u 2
1 59 n Cartridge n 1
160 n Needle Assy u 1
161 " Needle Cover rr 1
162 " Screw Ass'y n 1

Na. 2445

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