WX-GT90BT/GT90BTE/GT99BT
3
SECTION 1
SERVICING NOTES
The laser diode in the optical pick-up block may suffer electro-
static 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
fl
exible board is easily damaged and should be handled with
care.
NOTES ON LASER DIODE EMISSION CHECK
Never look into the laser diode emission from right above when
checking it for adjustment. It is feared that you will lose your sight.
If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi-
fi
xed resistor located at the side of optical
pick-up block.
optical pick-up
semi-fixed resistor
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(
Caution:
Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution:
The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
• Strong
viscosity
Unleaded solder is more viscous (sticky, less prone to
fl
ow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
1.
SERVICING NOTES
............................................. 3
2. GENERAL
.................................................................. 9
3. DISASSEMBLY
3-1. Disassembly
Flow
........................................................... 15
3-2. Mini Fuse (Blade Type) (10A/32V) (FU1), Cover ......... 16
3-3. Front Panel Block ........................................................... 16
3-4. CD Mechanism Deck (MG-101CA-188) ....................... 17
3-5. Connection Cable (MIC) (MJ1) ...................................... 17
3-6. MAIN Board (with BT Board) ....................................... 18
3-7. SERVO
Board
................................................................. 18
3-8. Chassis (T) Sub Assy ...................................................... 19
3-9. Roller
Arm
Assy
.............................................................. 19
3-10. Chassis (OP) Assy ........................................................... 20
3-11. Chucking Arm Sub Assy ................................................. 20
3-12. Sled Motor Assy .............................................................. 21
3-13. Optical Pick-up Section .................................................. 22
3-14. Optical Pick-up ............................................................... 22
3-15. Knob ................................................................................ 23
4.
TEST MODE
............................................................ 24
5. DIAGRAMS
5-1. Block Diagram - SERVO Section - ................................ 25
5-2. Block Diagram - MAIN Section - ................................... 26
5-3. Block
Diagram
- PANEL/POWER SUPPLY Section - ............................ 27
5-4. Schematic Diagram - MAIN Section (1/5) - ................... 29
5-5. Schematic Diagram - MAIN Section (2/5) - ................... 30
5-6. Schematic Diagram - MAIN Section (3/5) - ................... 31
5-7. Schematic Diagram - MAIN Section (4/5) - ................... 32
5-8. Schematic Diagram - MAIN Section (5/5) - ................... 33
5-9. Printed Wiring Board - MAIN Section (1/2) - ................ 34
5-10. Printed Wiring Boards - MAIN Section (2/2) - .............. 35
5-11. Printed Wiring Board
- KEY Board (Component Side) -................................... 36
5-12. Printed Wiring Board
- KEY Board (Conductor Side) - .................................... 37
5-13. Schematic Diagram - KEY Board - ................................ 38
6.
EXPLODED VIEWS
6-1. Main
Section
................................................................... 49
6-2. Front Panel Section ......................................................... 50
6-3. CD Mechanism Deck Section (MG-101CA-188) .......... 51
7.
ELECTRICAL PARTS LIST
.............................. 52
Accessories are given in the last of the electrical parts list.
TABLE OF CONTENTS
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
Содержание WX-GT90BT
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