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SECTION 6
ELECTRICAL ADJUSTMENT
Precautions for Checking Laser Diode Emission
To check the emission of the laser diode during adjustments, never
view directly from the top as this may lose your eye-sight.
Precautions for Use of optical pick-up (KMS-260A)
As the laser diode in the optical pick-up is easily damaged by static
electricity, solder the laser tap of the flexible board when using it.
Before disconnecting the connector, desolder first. Before connecting
the connector, be careful not to remove the solder. Also take adequate
measures to prevent damage by static electricity. Handle the flexible
board with care as it breaks easily.
MD SECTION
Precautions for Adjustments
1) When any of the following parts is replaced, perform the
adjustments and checks to which a circle (O) is put in the table
below, in the following order.
2) Perform the following adjustments in the test mode.
When the adjustments are completed, exit the test mode.
Perform the following adjustments and checks using the “Grope
S” of the test mode.
3) Perform the necessary adjustments in the order shown.
4) When observing several signals on an oscilloscope, make sure
that VC and ground are not shorted inside an oscilloscope.
(VC and ground will be short-circuited.)
5) When the above described “BD board waveform check jig” (Part
No. J-2501-149-A) is used to observe waveforms, waveforms
can be observed without soldering.
pickup
flexible board
laser tap
1. Initial setting of
adjustment value
2. Saving the IOP
information (the value
that is indicated on the
pickup)
3. Temperature
compensation offset
adjustment
4. Laser power adjustment
5. Traverse adjustment
6. Focus bias adjustment
7. Error rate adjustment
8. Auto gain output level
adjustment
Optical
Pickup
g
g
G
g
g
g
g
g
BD Board
IC171
g
g
g
g
g
g
g
g
D101
G
G
g
G
G
G
G
G
IC101
g
G
G
g
g
g
g
g
List of Service Tools
•
Oscilloscope
•
Digital voltmeter
•
Thermometer
•
Laser power meter LPM-8001
(Part No. J-2501-046-A)
or
•
MD laser power meter 8010S
(Part No. J-2501-145-A) (Note)
•
BD board waveform check jig
(Part No. J-2501-149-A)
•
Check disc (MD) TDYS-1
(Part No. 4-963-646-01)
•
Test disc (MDW-74/AU-1)
(Part No. 8-892-341-41)
•
Test CD YEDS-18
(Part No. 3-702-101-01)
•
Extension cable (19-conductor, 1.25 mm)
A
(Part No. J-2501-011-B)
•
Relay board (19-conductor, 1.25 mm)
B
(Part No. J-2501-168-A)
•
Extension cable (17-conductor, 1.25 mm)
C
(Part No. J-2501-167-A)
•
Extension cable (4-conductor)
D
(Part No. J-2501-165-A)
MAIN board
CN300
BD board
CN101
A
C
B
MAIN board
CN301
CONNECTOR board
CN701
D
MAIN board
CN302
LAD MOTOR
board
CN713
Summary of Contents for HCD-MD555
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Page 74: ...HCD MD555 95 96 7 20 SCHEMATIC DIAGRAM PANEL SECTION Refer to page 110 for IC Block Diagrams ...
Page 122: ... 148 MEMO HCD MD555 ...