8920A-05
SUPERSEDES: None
DATE: 26 June 1992
8920A RF Communications Test Set
Serial Numbers: 3141A00996 / 3211A01331
Intermittent Oscillation of Spectrum Analyzer (Option 002)
Duplicate Service Notes: None
Parts Required:
08920-69026, Exchange Assembly, A18 Spectrum Analyzer
Situation:
A problem has been noted in the A18 Spectrum Analyzer assembly which can result in a
screen (CRT) full of noise or mis-calibration. The problem has been traced to parasitic
oscillations caused by improper capacitive loading of the output buffer stage.
The following instruments are affected by this problem (Billings will NOT be accepted for
units other than the serial numbers listed below):
8920A Serial Numbers:
3141A00996 3207A01071 3207A01222 3207A01235
3207A01236 3207A01244 3207A01245 3207A01267-71
3207A01275 3207A01279 3207A01280 3207A01283
3207A01286 3211A01300 3211A01331
1 of 2
AUTHOR: LHL
ENTITY: 1000
© 1992 AGILENT TECHNOLOGIES
PRINTED IN U.S.A.
SERVICE NOTE
ADMINISTRATIVE INFORMATION
MODIFICATION RECOMMENDED
SERVICE NOTE CLASSIFICATION:
ACTION
CATEGORY:
LOCATION
CATEGORY:
CUSTOMER INSTALLABLE
ON-SITE
SERVICE CENTER
AGILENT RESPONSIBLE UNTIL: 01 August 1997
ADDITIONAL INFORMATION:
IMMEDIATELY
ON SPECIFIED FAILURE
AGREEABLE TIME
AVAILABILITY:
PRODUCT’S SUPPORT LIFE
RETURN
SCRAP
SEE TEXT
SERVICE
INVENTORY:
RETURN
SCRAP
SEE TEXT
USED
PARTS:
STANDARDS:
Labor 2.0 Hours
Continued
Page 2 Service Note 8920A-05
Solution/Action:
The A18 Spectrum Analyzer assembly has been re-designed to solve this problem.
Replace the A18 Spectrum Analyzer assembly with an exchange assembly (see Parts
Required). Chapter 10 of the 8920A Assembly Level Repair Manual contains removal
and installation instructions for the A18 assembly. Re-calibration of the instrument is
not required.
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