— 30 —
Laser Power Check
Connection:
Adjusting Method:
1. Enter the servo test mode (mode: 000) of the adjustment mode
of the test mode.
2. Press the
(
key, then press the key and VOLUME
– key to enter the laser power adjustment mode (mode: 020).
3. Press the
=
key to move the optical pickup to the most inner
circumference.
4. Open the cabinet lid and set the laser power meter on top of the
objective lens of the optical pickup.
5. Press the
(
key to enter the laser CD/MO read adjustment
mode (mode: 021).
6. Check that the laser power meter reading is 0.85 ±0.08 mW.
7. Check that the voltage between AP574 (LD01) and AP501 (2.8
V), is 44 mV or less.
8. Press the
(
key to enter the laser MO write adjustment mode
(mode: 022).
9. Check that the laser power meter reading is 6.8 ±0.68 mW.
10. Press the
P
key to set the adjustment data.
11. Check that the voltage between AP574 (LD01) and AP501 (2.8
V), is 88 mV or less.
12. Press the
p
key.
13. Exit the test mode.
SECTION 5
ELECTRICAL ADJUSTMENTS
laser tap
Optical pick-up flexible board
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-280A/J2N)
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.
Precautions for Adjustments
1)
Use the test mode when performing adjustments.
After completing the adjustments, exit the test mode.
2)
Use the following tools and measuring devices.
• Check Disc (CD) TDYS-1
(Parts No. 4-963-646-01)
• SONY MO disk available on the market.
• Laser power meter LPM-8001 (Parts No. J-2501-046-A)
• Oscilloscope (Bandwidth 40 MHz or higher. Calibrate the
probes before measurement.)
• Digital voltmeter
3)
As to power supply, supply DC 3.7V using the BATTERY
terminal unless otherwise specified.
4)
Switch and control knob position : HOLD switch ....OFF
Laser power
meter
Optical pick-up
objective lens
AP501 (2.8V)
AP574 (LD01)
MAIN board
Digital voltmeter
Ver 1.2 2001. 01