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3
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission, ob-
serve from more than 30 cm away from the objective lens.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveform is output four times.
TABLE OF CONTENTS
1. SERVICING NOTE
.......................................................... 4
2. GENERAL
.......................................................................... 7
3. DISASSEMBLY
3-1. Back Cover and Case ............................................................ 9
3-2. Panel Board and Stabilizer .................................................... 9
3-3. AMP Block ......................................................................... 10
3-4. CD Block ............................................................................ 10
3-5. Motor ASSY and CAM ....................................................... 11
3-6. Base Unit ............................................................................. 11
3-7. Main Board and Power Board ............................................ 12
4. ELECTRICAL ADJUSTMENT
..............................
13
5. DIAGRAMS
5-1. Circuit Boards Location ...................................................... 14
5-2. Printed Wiring Board – Main Section – .............................. 16
5-3. Schematic Diagram – Main (1/3) Section – ........................ 18
5-4. Schematic Diagram – Main (2/3) Section – ........................ 19
5-5. Schematic Diagram – Main (3/3) Section – ........................ 20
5-6. Printed Wiring Board – LED/Loading/SW Section – ......... 21
5-7. Schematic Diagram
– LED/Loading/SW Section Section – ............................... 21
5-8. Printed Wiring Board – AMP Section – .............................. 22
5-9. Schematic Diagram – AMP Section – ................................. 23
5-10. Printed Wiring Board – Panel Section – ........................... 24
5-11. Schematic Diagram – Panel Section – ............................. 25
5-12. Printed Wiring Board – Power Section – ......................... 26
5-13. Printed Wiring Board – Power Section – ......................... 27
5-14. Printed Wiring Board – REG Section – ............................ 28
5-15. Schematic Diagram – REG Section – .............................. 29
5-16. IC Block Diagrams ........................................................... 30
5-17. IC Pin Functions ............................................................... 32
6. EXPLODED VIEWS
6-1. Front and Case Section ....................................................... 36
6-2. Chassis Section ................................................................... 37
6-3. Mechanism Section ............................................................. 38
6-4. Base Unit Section ................................................................ 39
7. ELECTRICAL PARTS LIST
.................................
40
Summary of Contents for HCD-EX1
Page 8: ...8 This section is extracted from instruction manual ...
Page 17: ...HCD EX1 17 17 ...
Page 23: ...HCD EX1 23 23 5 9 SCHEMATIC DIAGRAM AMP SECTION Page 20 Page 29 Page 29 ...
Page 25: ...HCD EX1 25 25 5 11 SCHEMATIC DIAGRAM PANEL SECTION Page 19 ...
Page 27: ...HCD EX1 27 27 5 13 SCHEMATIC DIAGRAM POWER SECTION Page 29 ...
Page 29: ...HCD EX1 29 29 5 15 SCHEMATIC DIAGRAM REG SECTION Page 27 Page 23 Page 20 ...