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4-5. LASER
POWER
ADJUSTMENT
Connection:
Laser power meter
|
Optical pickup
O
Objective lens
Digital voltmeter
LI
o™m——© +
ree
RF/SERVO board
TP (IOP)
Adjustment method:
1.
Place the laser power meter on the objective lens of the optical
pickup. (If setting can not be made correctly, move the optical
pickup using the PP or 4
key.)
Connect the digital voltmeter to TP (IOP) on the RF/SERVO
board.
Press the YES key to let "Laser Power 6F" appear.
(laser power : for adjustment)
Adjust RV207 on the RF/SERVO board so that the reading on
the laser power meter becomes 3.4+0.1mW.
Press the YES key to let "Laser Power ES" appear.
(laser power : MO writing)
At this time, confirm that the reading on the laser power meter,
digital voltmeter meet the specifications shown below.
Specifications:
Laser power meter : 7.0 '83 mW
Digital voltmeter:
| Optical pickup reading +3mA
(Optical pickup level)
KMS-140B
25131
A1009
In this case : lop=100.9MA
lop (mA)=Digital voltmeter reading (mV) / 1(Q)
.
Press the YES key to let "Laser Power 16" appear.
(laser power : MO reading)
.
At this time, confirm that the reading on the laser power meter
and digital voltmeter become the specifications shown below.
Specifications :
Laser power meter : 0.85+0.08mW
Digital voltmeter : 42+5mA
.
Press the M(STOP) key to stop the laser emitting.
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