— 3 —
TABLE OF CONTENTS
1. SERVICING NOTES
······················································· 3
2. GENERAL
·········································································· 5
3. DISASSEMBLY
3-1. Lid Assy, Upper ······························································ 6
3-2. MD Assembly ································································· 6
3-3. Main Board ····································································· 7
4. SERVICE MODE
······························································ 8
5. ADJUSTMENTS
······························································ 9
6. DIAGRAMS
6-1. IC Pin Function Description ········································· 13
6-2. Printed Wiring Boards ·················································· 16
6-3. Schematic Diagram — CD Section — ························· 21
6-4. Schematic Diagram — Tuner Section — ····················· 26
6-5. IC Block Diagrams ······················································· 30
6-6. Block Diagram — Tuner Section — ····························· 33
6-7. Block Diagram — CD Section — ································ 35
7. EXPLODED VIEWS
7-1. Cabinet Section ····························································· 37
7-2. Optical Pick-up Section ················································ 38
8. ELECTRICAL PARTS LIST
······································· 39
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown 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, observe from
more than 30cm away from the objective lens.
Before Replacing the Optical pick-up Block
Please be sure to check thoroughly the parameters as per the “Optical
pick-up Block Checking Procedure” (Part No. : 9-960-027-11) issued
separately before replacing the optical Pick-up block.
Note and specifications required to check are given below.
• FOK output : IC501
!™
pin
When checking FOK, remove the lead wire to disc motor.
• S curve P-to-P value : 0.9 – 1.5Vp-p IC501
#¡
pin. (Connect pin
!™
of IC501 (TP880) and
3
of IC501 (GND) with a jumper
wire).
When checking S curve P-to-P value, remove the lead wire to
disc motor.
• Adjusted part for focus gain adjustment : RV503
• RF signal P-to-P value : 0.85 – 1.15Vp-p
• Traverse signal P-to-P value : 1.0 – 2.6Vp-p
• The repairing grating holder is impossible.
• Adjusted part for tracking gain adjustment : RV502
