Service manual

4-1
Troubleshooting
3Introduction
This chapter provides information for localizing cardiograph problems to the subassembly
level. This information is designed for use with the cardiograph’s Extended Self-test to
help you efficiently repair the cardiograph with a minimum of equipment.
3Maintenance Philosophy
The maintenance philosophy for the cardiograph is subassembly replacement.
Replaceable subassemblies are identified in Chapter 6, “Parts List”.
Individual component replacement should not be attempted outside of an authorized
Hewlett-Packard repair facility. Component level repair is extremely difficult due to the
extensive use of surface mount technology and the high parts density on the circuit boards.
Unauthorized component replacement can impair cardiograph performance, compromise
patient safety, and jeopardize credit towards a replacement assembly.
3Test Equipment
The following test equipment is required to troubleshoot the cardiograph as described in
this chapter:
• A digital voltmeter such as the Hewlett-Packard E2373A hand-held multimeter.
• A 12-lead ECG simulator.
• A jumper wire with Pomona Micrograbber test clips or equivalent. Ordering informa-
tion:
ITT Pomona 1500 East Ninth St.
P.O. Box 2767
Pomona, CA 91769
Sales: [phone]
CAUTION