Enraf Nonius 1403773, Service Manual

Page: 55 / 60

No: SI 670 - 02 Oct. 1998 Page 1 of 1
Enraf-Nonius B. V.
P.O. Box 810
2600 AV Delft
The Netherlands
Service Information
Curapuls 670, Preventive spraying of the main PC Board
To prevent high voltage break-down due to slowly increasing the mains voltage from 220VAC ->
230VAC last years, it is recommended to put an insulation lacquer on the rear (solder) side of the main
PC Board. The small clearance between a few high voltage (approx. 400V with respect to ground)
solder pads an the ground plane could cause a spark jump.
An anti-corona lacquer is available
to prevent this problem.
The marked area in the drawing
has to be treated with this lacquer.
Ordering information:
ANTI-corona spray,
EN. part number: 4120.018
Description:
RS COMPONENTS
part number:
569-313
Anti-corona lacquer clear, pliable,
moisture repellent lacquer designed to
reduce surface tracking and corona in
EHT circuitry.
Suitable for assembled PCB’s,
transformer windings and component
protection.
Dielectric strength: 48 kV / mm
Temperature range: - 20 to + 150 C
Package: 400 ml aerosol
Warning: Flammable propellant
Please add this service info to appendix
C of your service manual.
Change classification
)
Perform immediately on all field units.
)
Perform routinely at next service call.
)
Perform only upon unit failure.
0
Information only
Commencing date: July 1998
Carried out from series: NA
New components: 4120018 Anti-corona spray
Deleted components: NA
Our reference: WV0403680-74/01/02