Denon DCM-340 - Page 13

Caution for Handling the Laser Pick-up
The laser pick-up KSS-240A is assembled and precisely adjusted
using a sophisticated manufacturing process in our plant. Do not
disassemble or attempt to readjust it. Please keep the following
instructions carefully in handling pick-up.
1. Handle with Care
(1) Storage
Do not store the pick-up in dusty, high-temperatured or high-
humidity environments.
(2) Please take care for preventing from shock by falling down or
careless handling.
2. Laser Diode (LD)
(1) Protect your eyes
The laser beam may damage the human eye, since the
intensity of the focused spot may reach 7 x 10° W/cm? even if
the intensity at the objective lens is 400 pW maximum. As the
light beam spreads after focused through the objective lens,
it does not effect you in the place as far as more than 30 cms.
However, do not look at the laser light beam either through the
objective lens directly nor another lens or a mirror.
(2) Poison of As
Since the LD chip contains As (Arsenic), as GaAs + GaAlAs,
as known as the poison, although the poison is relatively weak,
in comparing with others, e.g.As203, AsCis etc., and the
amount is small, avoid putting the chip in acid or an alkali
solution, heating it over 200°C or putting it into your mouth.
(3) Avoid surge current or electrostatic discharge
The LD may be damaged or deteriorated by its own strong
light if a large current is supplied to it, even if only a short pulse.
Make sure that there is no surge currentin the LD driving circuit
by switches or else. Be careful to handle pick-up as it may be
damaged in a moment by human electrostatic discharge. The
pins of the LD are short-circuited by solder for protection
during shipment.
For safety handling of an LD, grounding the human body,
measuring equipments and jig is strongly recommended. And
still it is further desirable to make use of mat on the platform
and floor for handling the LD.
To open the short circuit, remove the soldering quickly with a
soldering iron whose metal part is grounded.
The temperature of the soldering iron should be less than
320°C (30W).
3. Actuator
(1) The performance of the actuator may be effected if magnetic
material is located nearby, since the actuator has a strong
magnetic circuit. Do not permit dust to enter through the
clearance of the cover.
(2) Cleaning the lens
It may change the specifications by attaching dust or ash on
the objective lens. Clean the lens with a cleaning paper
dampened with a little water, not pressing lens with so much
strength by the cleaning paper.
4, Metal Bearing
As the meta! bearing of Cu-compound sintered alloy is impreg-
nated with FROIL946P (*Part No. 529.0054 007), never fail to
supply the bushing with the same lubricant at the time of replacing
the pick-up.
5. Handling
Please handle the laser pick-up with holding the side base (rosin
moided part).
When either a part of human body or some other things may
happen to touch directly with the circuit part of P.W.Board, it may
cause deterioration, take careful attention in handling this base.
6. Deterioration
As KSS-240A comprises built-in RF Amp and APC curcuit, it
resists stronger against external electrostatic. damages than the
former typed pickup. However, there is possibility of pickup disto-
rioration in the following cases.
(1) Low HF level, or with great numbers of jitters.
(2) Tracking offset (EF Balance) is out.of order (Refer to "Confir-
mation Method of Adjustment " for confirmation on (1) and (2)).
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