HP 5890 SERIES II Service Manual page 9

Electronic Troubleshooting
INTRODUCTION
This section is intended to aid the operator and service engineer in the troubleshooting process, i.e., of
going from symptom to cause. It has been subdivided into four subsections by type of symptom.
Part A covers the most obvious indications of problems. The instrument apparently (generally when
first turned on) doesn' t work at all. (NON- FUNCTIONING INSTRUMENT)
Part B includes the symptoms that can appear as a visual indication or message on the front of the
keyboard/display module. These messages are a result of the instrument' s extensive automonitoring
system. (AUTOMONITOR MESSAGES)
Part C discusses the visual information that the operator can instigate and use as part of the trouble-
shooting process. These visual indications are normally not available unless specifically requested by
the operator. (OPERATOR INSTIGATED INDICATIONS)
Part D contains symptoms (other than those that appear on the visual display) that indicate a possible
problem. Typically, these types of symptoms can be associated with a specific functional area of the
instrument. (FUNCTIONAL SYMPTOMS )
Electrical Safety Precautions
In all nonelectrically oriented sections of this manual, the standard Hazardous Voltage Warning strongly
recommends turning off all of the power to the instrument. However, this section, as well as most of
Service Section, requires that some electrical measurements be made on active (energized) circuits.
MEASUREMENTS AND/OR TESTS THAT NEED TO BE MADE ON ELECTRICALLY
ENERGIZED PORTIONS OF THE INSTRUMENT SHOULD BE PERFORMED ONLY BY
SERVICE- TRAINED PERSONNEL WHO ARE AWARE OF ALL INVOLVED HAZARDS.
The Service Section of this manual contains proper step by step procedures for replacing electronic
boards and other major assemblies. These procedures include instructions that should be followed for
both personnel and instrument welfare.
The following steps require protection against ESD (Electro- Static Discharge).
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Use a grounded wrist strap (part no. 9300- 0969 - large, or 9300- 0970 - small)
connected to a suitable ground. Failure to heed this caution may result in
damage to the instrument.
When storing or in between handling of PCBs (Printed Circuit Boards), always
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place them in static control envelopes or enclosures.
Recommended Test Equipment
The only piece of test equipment required to troubleshoot the instrument is a good, volt/ohmmeter.
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