Nakamichi CDP 2 - Page 7

1.7. Handling the Laser Pickup
In case of repair or replacement of the Laser Pickup, pay
attention to the following handling instructions since the
laser diode in the Laser Pickup is not resistant to static
electricity.
(1) Grounding
When you repair a Laser Pickup, first ground the
human body, as well as the measuring instruments
and other tools (with particular caution to soldering
iron). What’s more, your workbench and floor should
desirably be grounded using conductive sheet or
copper plate. See Fig 1.1.
Note: Be careful so as not to let your clothes touch
the Laser Pickup, as static electricity on the
clothes will not be released even if your body
is grounded.
(NO GOOD)
Laser Pickup
Fig. 1.1
1.8.
Stocker
Operation
Check
Function
at
Power
ON
A
series
of
stocker
operation
can
be
checked
at
power
ON
by
means
of
RAM
Reset
jumpers.
This
funcion
is
useful
to
check
whether
any
CD
is
left
in
the
stocker
before
returning the unit to the customer.
(1) Turn OFF the power.
(2)
With
shorting
RAM
Reset
jumpers
on
the
Main
P.C.B.
Ass’y,
turn
ON
the
power.
(See
Fig.
5
for
location.)
metered |
Short 1
(Grounded
by
shorting)
(—
|
RAM
RESET
sioaee
(3)
The
stocker
raises
to
the
uppermost
position
and
then,
starts
CD
unload
operation
as
follows:
Disc No.:67 57473727178
During operation, only the disc number indicators (1,
2, 3, 4, 5, 6, S) are displayed (flashes).
(4)
After
completion
of
the
stocker
operation,
the
unit
returns
to
normal
condition.
(2)
(3)
(GOOD)
Discharge of Electricity
Be sure to discharge electricity from objects brought
into contact with the Laser Pickup (i.e., soldering
iron, tweezers, probes, volt-ohm-meter probes, etc.)
before starting work by contacting them with the
Compact Disc Player’s chassis. Besides, never touch
the Laser Pickup while power is applied.
Soldering Iron to be Used
The soldering iron for use in repair work shoud be:
(1) a ceramic soldering iron, (2) a soldering iron with
its metal part grounded, or (3) a soldering iron whose
insulation resistance after five minutes of power
application is 10 M-ohm or more at 500 VDC.
Soldering should be completed promptly, at a
soldering iron temperature of 320° max (39 W). A
soldering iron heated above this temperature can
break down the laser diode.
Wrist-strap
for Grounding
Conductive Sheet
or Copper Plate