Denon DP-S1 Service Manual

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14
Caution for Handling the Laser Pick-up
The laser pick-up KSS-151A is assembied and precisely ad-
justed using a sophisticated manufacturing process in our plant.
Do not disassembie or attempt to readjust it. Please keep the
following instructions carefully in handling pick-up.
1. General 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 1.3 x 10*W/cm? even
it the intensity at the objective lens is 400 u.W maximum. As
the light beam spreads ~‘ter 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.As2O3, 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 current in 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 dis-
charge. The pins of the LD are short-circuited by solder for
protection during shipment [Solderded short circuit portion
(A)].
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. X-axis 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 iens
It may change the specifications when dust or dirt is stuck
on the object lens. For cleaning, use a dry lens cleaning
paper applying no excessive pressure to the lens. If it is
difficult to remove it, moisten the paper with a little amount
of water. At this time never drip water other than the lens
portion.
4. Metal Bearing
The metal bearing of Cu-compound sintered. alloy is impreg-
nated with oil. However, supply oil with the specified oi] FROIL
947P(529 0054 007), at the pick-up replacing time. You do not
normally need jublicate the bushing in initializing time nor sup-
plying oil inrunning time.
5. Handling
Please handle the laser pick-up with holding by opticai base.
When either a part of human body or some other things may
happen to touch directly with the circuit part of either the LD or
PD PCB, it may cause deterioration, take careful attention in
handling this base.
6. Deterioration of Laser Pick-up
When difficulty occurs either in focus or tracking adjustment nor
abie to adjust the focus or tracking, it seems that the laser
pick-up is deteriorated. In these cases, check a value of laser
diode current and give a decision for deterioration.
7. Fundamental! Deterioration Decision of Laser Pick-up
(1) It a voltage value in across Pin © of TP102 (+5V) and pin
@ (iop) of Unit (3U-2415) is V1, the value of laser diode
current “iop 1” can be found a formula
. v1
“iop 1° = ——
1op 2 -
(2) If a “iop" exceeds + 10% compared with the IOP indication
on the laser pick-up nameplate, there is a fair chance i.
deterioration when it is checked under a circumambient
temperature 23°C.
(3) When the circumambient temperature changes + 10°C, "iop
1" will change + 5%. The “iop 1° will also be changed by the
passage of time.
(4) in case of the above conditions taking into consideration and
performed the adjustment in proper way, if the HF level
across pin @ (HF) of TP102 and across GND of TP101 in
3U-2415 becomes 0.6V or jess values; or a jitter occurs
great, the laser pick-up may be detenorated.

Denon DP-S1 Specifications

General

Brand	Denon
Model	DP-S1
Category	Farm Equipment
Language	English