Iop Checked Method; Cd Laser Current Check; Note For Handling The Laser Pick-Up; Replacement Of The Laser Pick-Up (Traverse Unit) - Denon S-52 DAB Service Manual

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1. Iop checked Method

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Select the laser ON/OFF (CD) mode of the test mode, and
check the lop value of CD laser.
(See page 32 for test mode.)

1.1. CD Laser current check

(1) Press the
current value, and then select T21.
(2) Check the current value of Iop (nnnn).
( : Off, CD laser, Initial value: mm.mm [mA],
Current value: nn.nn [mA])

2. Note for Handling the Laser Pick-Up

The protection for the damage of laser diode.
If you want to change the optical device unit from any other
units, you must keep the following.
(1) It should be done at the desk already took measures the
static electricity in care of removing the OPU's (Optical
TE
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device unit) connector cable.
(2) Workers should be put on the "Earth Band".
(3) It should be done to add the solder to the short land to
prevent the broken Laser diode before removing the 24P
FFC cable.
(4) Don't touch OPU's connector parts carelessly.
3. Replacement of the Laser Pick-up
(Traverse Unit)
Check the Iop (Laser drive current)
If the present Iop (current) value exceeds.+150% of the ini-
tial value, replace the Traverse unit (Laser Pick-up) with a
new one.
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