Troubleshooting; Introduction; Maintenance Philosophy; Test Equipment - HP PageWriter XL M1705B Service Manual

6
Troubleshooting
Introduction
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.
Maintenance
Philosophy
The maintenance philosophy for the cardiograph is subassembly
replacement. Replaceable subassemblies are identified in Chapter 8,
"Parts List".
Caution
Inclividual 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 and jeopardize credit towards a replacement assembly.
Test Equipment
The following test equipment is required to troubleshoot the
cardiograph as described in this chapter:
n
A digital voltmeter such as the Hewlett-Packard E2373A hand-held
multimeter.
n
A 12-leacl ECC simulator.
n
A blank 1.44-Mb disk (not needed with M1702A).
Troubleshooting 6-1