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Assembly-Level Service Guide xiii
Preface
This guide provides assembly-level service information for the HP 53131A
and HP 53132A Universal Counters, and the HP 53181A Frequency
Counter.
How to Use This Guide
Repair Strategy
This service guide is designed to isolate failures to the assembly level only.
The HP 53131A/132A/181A Counter can be returned to Hewlett-Packard
(HP) for all service work, including troubleshooting, and verifying
specifications. Contact your nearest HP Sales and Service Office for more
details.
Note: there is an Express Repair/Performance Calibration Service for USA
customers if downtime is critical. You can receive your repaired Counter
via overnight shipment. Just call 800-403-0801 and ask for Express
Repair/Performance Calibration Service. When your Counter is repaired,
it will be returned via overnight shipment at no extra charge.
If you decide to service the Counter yourself, use the troubleshooting
procedures in Chapter 2 (Service) and the disassembly and reassembly
procedures in Chapter 3 (Replacing Assemblies). Then use the calibration
instructions in Chapter 2 to calibrate the Counter for peak-performance
operation, and finally perform the complete performance tests in
Chapter 1 to verify the Counter’s specifications.
Instrument Identification
Instrument identification is made from the serial number on the rear
panel of the Counter. HP uses a two-part serial number with the first part
(prefix) identifying a series of instruments and the second part (suffix)
identifying a particular instrument within a series. An HP-assigned alpha
character between the prefix and suffix identifies the country in which the
instrument was manufactured.