Welch Allyn 220 Disassembly And Repair

Disassembly and Repair
About Section 4
This section is a guide for disassembly and reassembly of the Atlas Monitor. Always refer to
current revision schematics, diagrams and final safety test procedures before attempting to
service this device.
Do not attempt to service this instrument unless you have received Service Training from
Welch Allyn or an authorized Training Agent, and are equipped with approved processes
and test equipment. For more information about training call the Welch Allyn Customer
Service phone number listed in Section 1 of this manual.
General:
The outside housing is removable in order to provide full access to all internal printed cir-
cuit boards and other components. Most of these are held in position with the surrounding
"E-Pac" foam. E-Pac foam provides shock absorption, ventilation channels, and spaces for
the components and boards. Pneumatic tubing and cables must be placed correctly in E-Pac
to avoid problems with pinched tubing.
Problems During Service:
A Technical Support phone number is listed in Section 1 of this manual to answer questions
you may have during the servicing of the Atlas Monitor.
Printer:
Print-head, printer motor, and printer roller can be replaced as necessary.
Printed Circuit Boards:
There are no component level repairs for the Printed Circuit Boards(PCB). These are
replaced if found to be defective. During the warranty period, boards that are found to be
defective should be returned to Welch Allyn.
CAUTION
CRT:
The CRT and CRT Deflection Board are aligned at the factory and as such are replaced as a
matched set if one or the other should fail in service.
Service Manual 6200-43E Rev. D
Electrical Shock Hazard
EXERCISE EXTREME CAUTION WHEN
SERVICING THE ATLAS MONITOR! THE
CRT ASSEMBLY AND CRT DEFLECTION
BOARD OPERATE ON APPROXIMATELY
8,000 VOLTS.
Section 4
Welch Allyn Atlas Monitor 63