NAD M55 Service Manual page 6

IMPORTANT M55 & M5 MECHANISM INSTALLATION NOTES
INSTRUCTION FOR HANDLING 02-55598-00 FOR M55 & M5 AS WELL AS OPTICAL BLOCK
Electrostatic breakdown of the laser diode in the optical system block may occur due to a poten-
tial difference caused by electrostatic charge accumulated on clothing, human body, etc. A ground
must be provided as follows to prevent any electrostatic charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a ground band (1M ohm) that is properly to remove any static electricity that may
be charged on the body.
2. Ground for Work Bench
Be sure to place a conductive sheet (1M ohm) or copper plate with proper grounding on the work
bench or other surface on which the pick-up is to be placed.
3. Because the static electricity charge on the clothing does not discharge through the body
grounding band, do not let clothing to get in contact with the pick-up unit.
INCORRECT
NOTE: Laser diodes are so susceptible to damage from
static electricity that even if a static discharge does not
ruin the diode, it can shorten its life or cause it to work
improperly.
Caution:
Laser diodes are extremely susceptible to damage
from static electricity. Even if a static dis-charge
does not ruin the diode, it can shorten its life
or cause it to work improperly. When replac-
ing the pick-up, use a conductive mat,
a grounded soldering iron, and so on,
to protect the laser diode from
static damage.
1.Grounding band
1M ohm
Soldering
Iron with
Ground
wire
Conductive Gum Mat
1-4b
CORRECT
1M ohm
2.Conductive Sheet
or Copper Plate
Ground Conductive
Wrist Band for Body
Ground Line
Less than
10 ohm